The relation between the coal blending for the cokemaking with stamping coke oven and coke quality and relevancy between stamping strength and coal blending are described. It is pointed that the base of coke quality is the quality of coal blending, no fundamental change occurs because of coal preparation, cokemaking process and so on; the cokemaking with stamping coke oven can use more gas coking coal that has low deterioration degree and high volatile matter, to produce a certain quality coke, for the coal blending for cokemaking with stamping coke oven, the proportion of caking coal can be increased in coal blending so as to improve coke quality, but the cokemaking with stamping coke oven with about same coal blending for top charge coke oven will lose its superiority and cause problem. The issues of height and width ratio, heating mode and coal charging de-dusting etc. need to be further explored in the production practice.
Experiment and study are carried out with SH-A strengthened denitrogenation and carbon removal process for the wastewater from the coal based needle coke production. The operation conditions and treatment result at various sections are discussed in detail. After treatment with the process, the various indexes of the wastewater can meet the national grade I comprehensive effluent discharge standard (GB 8978—1996）, the removal rate of NH3-N is up to the range from 96.3% to 100% and removal rate of COD up to the range from 92.4% to 94.2%.
The existing process and technology need higher requirement of synthetic gas raw material, which causes the slightly higher cost for the downstream products. The utilization technology for low cost synthetic gas, especially for nitrogen containing synthetic gas is studied. The new technologies for dimethyl enther making with synthetic gas, F-T synthesis, low temperature liquid phase methanol synthesis etc. are described. The problems existing in the utilization of low cost synthetic gas, such as nitrogen containing synthetic gas are pointed out and its application foreground is prospected.
Through the measurement of optical organization and thermal property of coke, the relationship between the optical organization feature and quality of coke after the addition of lean coal and meagre and lean coal is discussed. After the addition of lean coal and meagre and lean coal, the optical organization takes the fine grain inlay and medium grain inlay as the main, silk like carbon and fragment are relative more. The optical organization structure unit of medium size coke is more favorable to improve the strength of coke. Through regression analysis the coke quality prediction model is established and the coke reactivity index and post reaction strength can be obtained directly through the measurement of coke optical organization content.
The difference between microphotometer and quasi-microphotometer was introduced. The visual diaphragm system is the important component of microphotometer, it provides the necessary condition of light beam injected vertically and horizontally, its locked measurement limit area enables the reflectance light of vitrinite to be measured not influenced by interference of reflectance of vitrinite. The trueness and accuracy of the vitrinite reflectivity were ensured. Quasi-microphotometer is lack of microphotometer sight diaphragm system, which can’t provide light beam vertically and horizontally injected, it has no the function to lock vitrinite to be measured and Kerogen is not interfered by the surrounding splitter line, the reflectivity to be measured has no objective reality.
The new automatic control system for coal blending is described. Electronic scale is used to replace nucleon scale. In the process arrangement, weighing belt conveyor is eliminated. Coal blending is done through weighing result difference so as to reduce the intermediate link and can meet the technical requirement of coal blending. The system is operated smoothly, the qualified rate of coal blending is high and economic benefit is good.
The abnormal variation condition of process parameters such as coke discharge temperature, pre-chamber level and power generating capacity were introduced after dismantlement of the bell type distributor for 150t/h CDQ charging device at Jinan Iron & Steel Company. In combination with the production actual condition, the process parameters, mainly including the central and peripheral air distribution proportion, air-coke ratio and pre-chamber level, were rationally adjusted after dismantlement of distributor.
The analysis of force suffered on 7m coke oven door proper was made by means of ANSYS finite element analysis software, which was beneficial to the improvement of oven door structure, material and manufacturing, especially for improvement of structural design at stress concentrated area, it has very high actual applicable value for lowering the damage probability of oven door. The result from analysis can provide scientific reference data and theoretical basis for oven door design and manufacturing.
To identify the relationship model between coke oven flue temperature and regenerator temperature, the pre-treatment should be made on the identified data. Against the periodic influence on top of regenerator due to gas reversal, the treatment mode of regenerator top temperature compensation based on center-point method was given, the pretreatment necessity on temperature model identified data was analyzed. The center-point compensation method was used to compensate and treat local data, the expected effect was achieved.
The different crude benzol hydro-refining and extractive distillation processes were compared, the factors of product quality, variety, recovery yield, energy consumption and investment were analyzed. In combination with the actual situation, the features of different crude benzol hydro-refining and extractive distillation processes were introduced. When constructing crude benzol hydro-refining system, many factors should be comprehensively considered, therefore low temperature hydro-refining process should be selected firstly.
The problems existing in the wastewater system for biological dephenolization system are described. Through the modification of process, the volume of flotation anaerobic water absorption well is expanded and the problem of the high index of discharged water is solved. The excess sludge disposal process is explored by creating new process and good result is obtained in application.
The further treatment technology for coking wastewater and its application conditions at present in our country are described. According to the actual conditions of recycling coking wastewater, the problems existing in recycling coking wastewater are analyzed and the major problems are secondary pollution and equipment corrosion, and the pertinent improvement suggestions are made.
For the CDQ demineralized water system for No.3 and No.4 coke ovens of Jiu-steel, reverse osmosis system and mixing bed system are taken as the key equipment, the fully automatic filter and ultrafiltration system are used as pre-treatment unit; the water making mode of macromolecule separation film and mixing bed is adopted and the produced demineralized water is high in quality; the pressure before the film is kept at low level ranging from 0.02~0.06MPa and ultrafiltration incoming water flow rate can be stabilized at about 70t/h. The problems occurring in the actual application of the demineralized water system and various kinds of improving measures taken are described.
Abstract: The present situation of the coking industry in China and the requirement of blast furnace macro-scale operations technology on coke quality were introduced, the active factors and un-favorable factors confronted for the development of independent coking plant in China, the development strategy that the independent coking plant should be combined with upstream coal mine and extended with downstream iron and steel enterprises. The independent coking plant should strengthen strict management, lower the cost, save energy and reduce thedischarge, comprehensively utilize coke oven gas and enhance economic benefit.
The requirement of gasification with gas flow bed on coal quality was introduced, the influence of coal moisture, reactivity, size and ash on gasification was described. The study showed that water in coal was the main factor to determine coal slurry property, the sticking temperature curve of ash slag had more instructive significance than ash fusion point in the operation of gasifier, to select coal which had flat ash slag viscosity variation in the operating temperature area was beneficial to the safe and stable running of gasifier.
Study on sulfur conversion relationship between coal for cokemaking and coke
The laboratory crucible cokemaking test was made with 56 kinds of coals for cokemaking in WISCO, the sulfur conversion relationship between coal and coke was studied so as to lower sulfur content in coke and to rationally use coal. The results from study showed that as for single kind of coal for cokemak?鄄ing, the sulfur conversion rate (ΔS ) between coal and coke was lowered with the increase of volatile matter （Vd）, it had better correlation; the proportional factor (ΔS/K ) between sulfur in coke and sulfur in coal for coking was increased with the volatile matter （Vd）. Whether it was the single kind of coal for coke making or coal blend, their sulfur in coke was increased with the increase of sulfur in coal for cokemaking, and it had good correlation.
Through 40kg small coke oven test, the relationship between coal petrographic indexes (CBI and IS) and coke indexes M25 and CSR is studied. The test shows that the relativities between the average reflectivity R and mechanical strength M25 and CSR are obvious. The coal petrographic index can not only predict the mechanical strength and CSR of coke, but also can make it approach optimized coal blending ratio through the adjustment of CBI value. In order to reduce the using amount of major coking coal and lower the costs of coal blending and cokemaking, a new way is developed.
The main problems and causes existing in the cokemaking with stamping coke oven are analyzed, the corresponding improvement measures and the problems which are to be solved are put forward, and the experiences on the improved operation control of the cokemaking production with stamping coke oven aresummarized. The operation result after improvement is good, the cake stamping time during normal production ranges from 7~8 minutes/cake and operation time ranges from 17~18 minutes/oven.
New method of identifying the model of correlation between regenerator top temperature and flue temperature
Against the identification issue of the correlation model between coke oven flue temperature and regenerator top temperature, a model identification method based on least square method with pre-estima?鄄tion of confidence interval was put forward. This method can effectively eliminate the effect of gas reversal on different trends of flue temperature and regenerator top temperature. By using pre-calculation of confi?鄄dence band, the issues of the correct fitting data brought by compact identification data and incorrect physics meaning can be avoided.
Coke powder is utilized as emaciating agent and mixed in coal during coal blending for cokemaking. This not only solves the coke powder sale problem and reduces environmental pollution, but also saves large amount of lean coal to realize the secondary utilization of energy. The applications of coke powder preparation processes and technologies in production are described. The five coke powder preparation processes of dry process, wet process, lubricating grinding, vibrating rod mill and high pressure roller mill are narrated respectively and the advantages and disadvantages of the five coke powder preparation processes and equipment are analyzed and compared.
The further treatment process of waste water with nanofiltration membrane was introduced in this paper, the study of coking effluent further treatment with nanofiltration membrane showed that nanofiltration membrane is characterized by stable, safe and reliable running, high water production yield, less concentrated solution quantity, about 50% of desalinization ratio, high entrapment rate to COD, <50mg/L COD produced in coking effluent, which can meet the requirement of make-up water for circul- ating water, the reused water of coking effluent can meet the process requirement, and it is economic and feasible.
An introduction is given to the process flow, process features and key point control of AS gas desulphurization and the existing problems and ways for improvement are pointed out. In the process, the ammonia scrubbing of gas is combined with desulphurization and ammonia is used as heat source to make desulphurized solution regenerate and increase the free ammonia content in desulphuring lean solution. AS gas desulphurization process has higher desulphurization efficiency.
High purity hydrogen can be separated from coke oven gas by pressure swing adsorption technology. The technology has become the dominant technology for the hydrogen separation from coke oven gas because of its simple process, less investment and convenient operation. The production process and working principle of hydrogen making with coke oven gas are described, the features of plant are evaluated and the problems occurring in the operation are analyzed. Meanwhile the corresponding handling measures are put forward.
One high-efficient degrading strain which took pyridine as only carbon source and nitrogen source was separated and screened from activated sludge of coking effluent of WISCO, the influence of the factors such as pyridine initial concentration, inoculum size, pH value, temperature and metal ion on strain degradation property was studied. The test results showed that this strain had stronger resistance on pyridine, which can be 1 200mg/L. The suitable condition for pyridine degradation was 30℃, pH 7.5 and inoculum size 5%, if suitable Fe2+ was added, the pyridine degradation could be promoted.
Each content of components of three-fraction mixed oil is determined with capillary gas chromatography. The simulative distillation data of three-fraction mixed oil are obtained according to the linear relation of the chromatographic result and distillation result. The determined result has good accuracy and precision. The total time of analysis does not exceed 20 minutes. The method can substitute for distillation method for the determination of the initial boiling point, final boiling point and naphthalene content of three-fraction mixed oil.
The process flow and features of tar distillation processes in China and foreign countries are discussed. The process flow and features of the newly developed tar distillation are described. Through comparison, the superiority of the new process is showed. The tar processing capacity of one set of plant can be up to 500 000t/a, and the macro-scale operations technology, energy-saving and energy consumption reduction are realized. The new process has the value of popularization.
The advantage of large capacity technology of stamping coke oven was analyzed, the main forms of stamping, charging and pushing machines were introduced. The necessity of localized stamping, charging and pushing machines for 6.25m stamping coke oven was described, by comparison of the process configuration and investment situation with the introduced technology, specific suggestion on large capacity technology of stamping coke oven and localized SCP machines.
A low cost desulphurization technology for cokemaking coal with high sulfur is developed. The study reveals that after the cokemaking coal with grain size from 0.45mm to 0.6mm and high sulfur is impregnated with 2mol/L NaOH solution and irradiated with 700W microwave for one minute, the desulphurization rate can be up to 42.5%, while its coking property has no effect. The technology is used as a practical technology and has a good application prospect.
The correlations between the factors of stability and moisture of blended coal, coal grain size composition and stamping frequency etc. of coal cake in the stamping cokemaking process are studied. The comprehensive analysis indicates that the coal cake stability expressed with the indexes of compressive strength and shear strength is more accurate. When the moisture of blended coal is controlled in the range from 9% to 11%, stamping frequency is about 5 and the fineness of blended coal is about 90%, the stamping cokemaking production is more suitable. At this time the stability of coal cake is better.
The investigation and study situation and laboratory study situation of coal preparation technology of winnowing and CMC both at home and abroad were introduced. The study showed that coal preparation process of winnowing and CMC can increase coke strength and coke uniform factor, improve the uniform degree of ash in coal blend, improve coke quality, this technology has the potential energy of environmental protection, energy- saving, coke oven service life extension and also can lower the cost.
Taking the multi-drive transmission system for high capacity coke oven machine as the study object, against the big current difference issue of multi-drive motor caused by non-uniform load, by application of asynchronous motor vector control technology and load balance control principle, the load balance control model of multi-drive transmission system for coke oven machine was established. The model is applied in production practice, which enables that the control system is characterized by good balance ability, fast response speed and higher stability, and better to meet the control requirement of drive system.
By selecting dry ash-free volatile matter（Vdaf）, maximum plastic zone thickness （Y） and height and width ratio of coking chamber （L/B）as independent variables, the production data of 4 different type coke ovens are analyzed through the clone selection algorithm based on gene expression, and the predictive model for coke quality is established. In comparison with the predictive models obtained with the method and regression analysis method, the error of the coke quality predictive model obtained by the method is far less than that obtained by regression analysis method, the model can meet the actual production requirement better and provides the theoretical base for getting coal blending ratio quickly and accurately for coking plant.
The running situation of CDQ system was summarized in all-around way, including production situation, main technical and economic indexes, coke quality improvement situation, metallurgical coke yield, coke breeze rate, coke fine variation, consumption of various kinds of public utilities, maintenance, depreciation, labor expense and income, etc. The energy-saving effect, direct economic effect, extended effect and environmental protection effect of CDQ process under different situations were analyzed.
The influence of high pressure ammonia liquor on the emissions transmission result in the production of stamping coke oven is disserted. According to the principle of hydromechanics, the effects and laws of the factors, such as structure, installation position, diameter, pressure etc. to the emissions transmission performance of high pressure ammonia liquor spraying nozzle are discussed. In accordance with the various kinds of influencing factors, the corresponding optimization countermeasures are put forward so as to provide the theoretic basis for perfecting further the design of emissions transmission process.
The chemical precipitation process was used to treat high concentration NH3-N in wastewater, the influence of the factors such as chemicals blendinig ratio and pH value on NH3-N was studied. Under suitable conditions, the pure and clean MAP crystal can be obtained, the removal rate for NH3-N can be reached to 98%. At the temperature of 100℃, heated for 3 hours and MAP was decomposed, the composed substance can be used for the removal of NH3-N in wastewater in repeat, the removal rate of NH3-N can be reached to 93%, the cost of chemicals can be substantially reduced and NH3 in waste water can be recovered.
Abstract: The purpose, principle, process flow and precautions of BASF catalyst sulfuration are described in combination with the catalyst sulfuration experience on Wu-steel 1×105t/a crude benzol hydrorefing project. Through sulfuration, BASF catalyst can improve the catalyzing reactivity and prolong the operation cycle of the plant so as to raise economic benefit.
Flushing liquor contains several kinds of corrosive mediums, such as H2S and so on. They are not main cause of the leakage of flushing liquor pipeline. The combination effect of the various kinds of residual stress and medium corrosion generated of flushing liquor pipeline causes the stress rupture of the pipeline. The stress corrosion by H2S etc. and hydrogen damage are the major cause of flushing liquor pipeline leakage. The welding defect generated or the microcracks developed by stress corrosion on the inner wall of the flushing liquor pipeline can cause the joint corrosion of flushing liquor pipeline. Therefore the use of A302 stainless steel transitional welding rod to ensure welding quality and the effective elimination of various kinds of residual stresses can avoid the leakage of flushing liquor pipeline.
The data of vapor-liquid phase equilibrium of benzene and N-formyl-morpholine are determined actually at atmospheric pressure. The data are related with the utilization of Wilson equation and NRTL equation. The result shows that the binary system of benzene and N-formyl-morpholine has a good relationship. The thermodynamic agreement examination is also conducted for the vapor-liquid phase equilibrium data and the result is rational.
CH4, CO, CO2 and NH3 in pyrolysis products of three kinds of anthracites were quantitatively analyzed and studied by means of TG-FTIR. The result showed that the start release temperature and release peak temperature of CH4 were gradually increased together with the reduction of the volatile matter content; CO release peak temperature of individual coal sample was basically the same. the start release temperature of CO2 was about 195℃, the release total amount of CO2 was increased with the increase of the volatile mat ters of coal sample, the temperature release law of NH3 was similar, but the release of NH3 of coal sample at 900℃ was not thoroughly reacted, the NH3 release amount of coal sample from Jiaozuo which has maximum volatile matter and nitrogen content was maximum, however, Longyan coal was minimum.
It is discovered through the study on the stamp-able property of 6 kinds of coal with different coalification degrees that the stamp-able properties of the coals with different coalification degrees have very great differences and the anthracite with medium coalification degree has better stamp-able property. Meanwhile it is found that the most suitable stamping pressure intensity is about 30MPa after the effects of stamping pressure intensity, moisture content and grain size composition on coal cake property are investigated with gas coal and fat coal as study subjects. Each of these kinds of coal has its optimum moisture range and the grain size composition has very obvious influence on coal cake property.
The study situation of lignite extraction with solvent, including the composition features of lignite, selecting principle for extracting solvent is described, and the results of lignite extraction are obtained with different extracting solvents and different extraction modes etc. The study on the lignite extraction with solvent is summed up. It is pointed out that the present study on lignite extraction with solvent is still in the stage of laboratory study and there is long way to go for industrial application.
When coke oven couldn’t keep normal production, normally the method of extending coking time was adopted to lower production capacity. The work of oven temperature adjustment and control, pressure adjustment and control, oven proper maintenance were well done in case of longer coking time. The control measure and experience under the condition of long coking time of coke oven were analyzed, the process indexes such as Kmean, Ksafe and coking heat consumption and oven chamber vertical heating were proposed.
The technologies of process, environmental protection and safety of 7.63m coke oven are described. The various kinds of problems and troubles occurred in the production process are summarized and corresponding improving measures are taken. Production practice shows that 7.63m coke oven has the high levels of mechanization, automation, energy saving, environmental protection and production output.
The properties of domestic 10 kinds of coal for cokemaking and 6 kinds of Australian coal are described. Coal blending experiment is carried out on the basis of single coal study and analysis, and test and industrial test are done with Australian coal to replace domestic coal. The result of experiment shows that when Australian PDC coal is used to replace 25% Jiexu coking coal, coke strength after reaction is improved by 13% and cold crushing strength by 2%.
The internal benefit of the application of cokemaking process of CDQ technology in the production system of the integrated iron and steel enterprise is analyzed and calculated according to the relative data of the commissioning and operation of 140t/h CDQ system of Kunming Iron and Steel Controlling company. The result shows that the replacement of the traditional coke wet quenching process with CDQ process can obtain a certain direct economic benefit. The more important point is that CDQ system can contribute to a comprehensive value to the subsequent iron and steel production process and to the social benefit of energy-saving and discharge reduction of the enterprise.
The main function and production conditions of SCP integrated stamping machine are described. The stamping machine is characterized by short operation time of single oven, less wattless moving of cars, long service life of parts, less long-term maintenance fee, wide range for adapting production conditions, more safety devices and advanced emergent disposal system for coal spillage. The difficult problem of that production is influenced by the instability of coke oven machines for stamping coke oven is solved tentatively. The continuous and stable production can be realized.
The progress of the study on coking waste water treatment with electrochemical process is discussed from the aspects of micro-electrolysis process, electrolytic oxidation process, electro-coagulation process, three-dimensional electrode process and so on. The advantages and disadvantages of various kinds of processes are analyzed and the developing direction of the coking waste water treatment with electrochemical process is put forward.
The modification of Ni and Co is carried out for the catalyst carriers prepared with type A, B, C and D molecular sieves and various kinds of catalysts are used to do the hydrocracking reaction experiment of PRO resid. The analysis shows that the total conversion rate of condensed aromatics and selection of monocyclic ring compound are related with the pore diameter of catalyst, the metal content has also the effect on them, while the relationship of the selectivity of dicyclic compound and these factors is not obvious.
The reaction principle and process flow of distillate scrubbing dephenolization of tar processing are described. The problem of low phenol content in neutral phenolate is analyzed. The process indexes, such as quality of scrubbing raw material, diluted soda solution concentration, reaction temperature, separation interface etc. are optimized and adjusted. The scrubbing quality after improvement takes a favorable turn. The phenol content in neutral phenolate is raised from 16.39% to 21.79%; the average phenol content in naphthalene oil for dephenolization is reduced by 0.06%; the sale price is increased by approximate 510 RMB yuan/t.
The determination of silicon content in coal pitch with spectrophotometry is studied. After sample is incinerated, it is fused with sodium carbonate under high temperature to form soluble silicate. It reacts with ammonium molybdate to form molybdosilicate yellow and reduces to molybdosilicate blue with ammonium ferrous sulfate under the strong acidic condition. Under the wave length of 810nm, it has maximum absorption and quantification is done with standard curve method. A color development reaction condition test, precise test, recovery rate test and check test are done. The recovery rate with added specimen is in the range from 91% to 105% and relative standard deviation is less than 7%.
In combination with actual operation conditions of 4 sets of CDQ systems which have representativeness domestically, the CDQ systems are studied from the aspects of measuring method and means, energy utilization efficiency, comprehensive evaluation of the systems and so on. When coke moisture content is reduced by about 4%, M40 is raised by 3%~4% and M10 is lowered by 1%; when the hot state property is raised, reactivity index is reduced by 5% and coke strength after reaction is enhanced by about 5%. In comparison with wet quenched coke, the true density of dry quenched coke has increased slightly, the anisotropic degree in coke optical contexture is strengthened, the anisotropic index is raised by 1.1% in average and porosity is lowered by 7.8%. The technology developing direction of domestic CDQ system and role and position of CDQ technology in energy-saving and discharge reduction are discussed.
A study is carried out for the extraction residue from the supercritical methanolysis of lignite through proximate analysis, elemental analysis, ash composition analysis and calorific analysis. The results show that the water content of extraction residue from the methanolysis of lignite is 6.93%~11.35%, ash content is up to 22.10%~24.46% and volatile matter is 39.75%~45.53%. The extraction residue from the methanolysis of lignite has no caking and coking properties and its carbon content is 66.74%~76.03%； its hydrogen content is 4.51%~5.06%; its nitrogen content is 0.95%~0.99%; its sulfur content is 2.10%~2.57% and its oxygen content is 15.79%~25.13%；the C/H atomic ratios of extraction residue from methandysis of lignite are in the range from 1.214 to 1.302. The ash component of the extraction residue from the methanolysis of lignite contains mainly SiO2, Al2O3, CaO and Fe2O3, in which SiO2 content is up to 47%~54%. The calorific value of the extraction residue from the methanolysis of lignite is 20.21~22.65MJ/kg.
Through the studies on the coke porous structure and coke hot property of the coke made with single coal and coke made with blended coal in 40kg test coke oven and coke made in industrial coke oven, the effect of coke porosity on coke hot properties is obtained. The coke porosity has greater influence on the coke hot property. CRI increases and CSR decreases with the porosity increase. The correlation between the porosity and hot strength of the coke from industrial coke oven is that if porosity is increased by 1%, CRI is increased by 0.48% and CSR is decreased by 1.46%. The coke hot property determination with porosity has a guiding significance for coke production and coke hot property control.
The microstructures and hot property of the coke made with two types of gas coal with different grain sizes used in coal blending are analyzed. The result shows that when the gas coal nature and grain size are different, the degrees of reaction impetuosity occurring on the interface of the coke made are different, its result influences coke property. The smaller the grain sizes of gas coal, the bigger the interface contact area and the more impetuous, the interface reaction. The higher the content of active component in gas coal, the more impetuous, the interface reaction.
The coal blending test was conducted by the orthogonal design method, the correlation between the blending ratio of different kinds of coals and coke strength was studied. By means of orthogonal design method, the number of test could be greatly reduced, M40, M10 obtained from test, the coke size of bigger than 40mm and 25mm were analyzed by statistics, the optimal coal blending ratio was selected as: weakly caking coal 0, lean coal 25%, fat coal 18%, coke fine 3%, coking coal 54%.
The thermal balance calculation and comparison are carried out for the design working conditions and variation working conditions of the power generation station by taking the CDQ power station of the plant of gas making with coke-making of Tangsteel as the study subject. On the basis of this, an analysis is conducted for the surplus heat recovery of CDQ power station, coordination of thermal energy utilization system and the heating power parameters matching between the inert gas circulation and steam circulation. Their analyzed results can provide a basis for optimized design and high efficiency operation of surplus heat power station.
The whole process flow industrial sidestream experiment is conducted for the natural gas synthesized with coke oven gas. The scale of experiment is 150m3/h of coke oven gas. The experiment of methanation unit lasts for 1 000h. The experiment result shows that M-849 catalyst has good methanation activity and selectivity and possesses good stability after many times start and stop and good performance of short term over temperature. The operation of the process with two-stage thermal insulation methanation of steam spatchcocking and no reacting gas circulating is smooth and simple. The composition of gas at the outlet meets the requirement of design indexes.
The three kinds of A, B, C catalysts for which different molecular sieves carrying Ni are taken as carrier are evaluated with high pressure hydrocracking device. The result indicates that type C catalyst has biggest specific area and pore Volume and AATO distillate conversion rate is 39.4%. The sum of benzol and xylene yields is 18.5%. Co is added to type C catalyst that has more ideal hydrocracking property, in order to improve property. The result shows that the addition of Co is favorable for BTX yield improvement and BTX yield is 25.9%.
The high added value aromatic chemical product made with coal is an effective way for the realization of clean and high-efficiency utilization of coal. The quick pyrolysis technology, directional catalytic conversion technology of pyrolyzate and hydrorefining liquefcation of coal for aromatic chemical product making are discussed on the basis of the present situation of relevant study and analysis carried out both at home and abroad. A new clew for making high added value aromatic chemical product is put forward.
To solve the problem of failing to reach the chroma standard of the coking waste water after the biological treatment with A/O process, the dicyandiamide-formaldehyde cation decolorizing flocculant is synthesized with dicyandiamide and formaldehyde as main feedstock. The decolorizing test of coking waste water is carried out. The result shows that when the colority of coking waste water is 158, pH value is 7 and adding amount of flocculant is 8mL/L, the decolorizing rate can be up to 61.21%.
The composition of tar obtained from independent pyrolysis of coal and municipal solid waste and co-pyrolysis of coal and municipal solid waste under different blending ratio by means of 2kg simulating coke oven system was analyzed. The result showed that the composition of tar from pyrolysis of Shenhua coal was mainly contained with aromatic hydrocarbon（41.13%）and alkane（30.79%）；the composition of tar from pyrolysis of municipal solid waste was mainly contained with olefine（25.70%）and alkane（28.38%）. Compared with the data from theoretical calculation, the oil content such as benzene and naphthalene in co-pyrolytic tar was increased by 3.20%~7.97%, the content of chain hydrocarbon（alkane and ole fine） was increased by 10.14%~ 12.69%, the organic composition of the oxygen-bearing functional group was reduced by 6.6% ~ 14.64%, the composition of tar from pyrolysishad the obvious “chain hydrocarhylation” tendency.
The low NOx combustion gas reburning process was analyzed, the mechanism of NH free radical with NO reaction was studied by means of the quantum chemical density functional theory, the geometry of reactants, intermediates, transition states and products in reaction process were optimized, and their energy was calculated, at the same time the vibration analysis was conducted so as to determine reality of intermediates and transition states. The NH free radical and NO reaction mechanism and experimental results were verified and compared, by means of simulating important theoretical reference value and practical guide on the understanding of the nature and main process of denitrification during reburning.
According to the feature of containing SO2 and H2S in semi-coke gas, a new semi-coke desulfurization process that is different from the process for high temperature cokemaking is put forward in combination with the existing desulfurization process. In the process lime water is first used to scrub the SO2 in the gas quickly, then SO2 is removed from the gas by super-gravity force machine so as to reduce the total sulfur content in the gas and to meet the required discharge standard of national environmental protection.
b value of coals with two different blending ratio was measured by Audibert-Arnu dilatometer, the optimal blending ratio was calculated by mathematical method, and the optimal blending ratio was proved by the coking test in laboratory. The results showed that the optimal blending ratio of two kinds of coals measured with Audibert-Arnu dilatometer in combination with mathematical method was basically correct. But for some low and middle rank coals with less inert matters and higher volatile matter, when blending it existed abnormal law and phenomenon. This method could also be applicable to calculate the optimal blending proportion of three or more kinds of coals, but the tolerance might be increased.
Coke sample is made by the method in which the coke with a certain grain size is immersed in the solution of alkali metal compounds（K2CO3+Na2CO3） with different proportioning ratios. The CRI experiment is carried out for coke sample by the use of thermogravimetric balance, and analysis is done by SEM and energy spectrum. The result of the study shows that the composite catalysts of alkali metals K and Na with different proportioning rates have different catalysis results. K2CO3 has a greater contribution to the catalysis of the reaction of loss by solution of coke. The main catalysis time of the reaction of loss by solution of coke is the first 10 minutes. The K and Na contents in coke sample immersed in alkali metal solution are increased with the increase of K and Na contents in alkali solution.
The analogue coke reactivity and coke strength after reaction were adopted, the relation between thermal properties and microstructures of coke produced from single coal with different metamorphism was studied. The coke produced from medium rank of coal such as coking coal, fat coal and lean coal had higher anisotropy, however the coke produced from low rank gas coal, 1/3 coking coal and higher rank meager coal had lower anisotropy. The coke thermal properties and coke anisotropy had good correlation, the coke reactivity was reduced with the increase of anisotropy, while coke strength after reaction was increased with the increase of anisotropy.
The application of intelligent central management and control at the Coking Plant of Jinan Iron & Steel Company was introduced, the problems to be solved for realizing intelligent central management and control were put forward, the suggestion was given for the development orientation of the coking production automation. The basic automation level of the Coking Plant of Jinan Iron & Steel Company is basically complete, however, the production data information platform of the whole process flow of coal, coke and by-products was not formed yet, the flat management and control of coke oven batteries and full automatic running of coke oven machinery should be further deepened.
The correlativity between COD and UV254 value during the treatment of coking wastewater is studied in the paper. The result shows that the COD and UV254 values of the water discharged from the biological system and of the water after further treatment have very good correlativity and the correlativity factor is about 0.988. The further treatment result can be predicted through the quickly measurement of the value of UV254.
The applications, basic principles, treatment results, advantages and disadvantages of biological process, flocculation process, adsorption process, chemical oxidizing process and film separation technology in coking wastewater decolorization are described. For the coking wastewater decolorization, the appropriate process is to be selected and several kinds of technologies can be combined together to raise removing rate.
The test of a flat plate film SMBR device in the coking plant is described. The result shows that the coking wastewater treatment with the flat plate file SMBR device is characterized by many advantages, such as strong impact resistance capability, high removal efficiency of ammonia nitrogen and COD, stable sludge concentration, less generated sludge amount, film strong resistance capability to pollution, long cleaning interval, stable discharged water index and so on. The externally discharged water can be up to the national class I standard.
ISSN 1001-3709 CN 21-1164/TQ Sponsor:ACRE Coking & Refractory Engineering Consulting Corporation,MCC Postal Code:8-28
