This paper introduces the application of improving the coke M40 acceptability rate in Shasteel 7.63 m coke oven.Through establishing the contribution rate of individual kind of coal to coke M40,optimizing coal blending by using vitrinite reflectance and Gieseler fluidity,plus cokemaking process like CDQ,thus the M40 compliance rate can be steadily improved.The high-quality metallurgical coke can be used for 5,800  m3 blast furnace,which ensures the smooth operation of the blast furnace.

Due to short R&D and production history of domestic needle coke,there are some differences between domestic and imported needle coke in product quality and stability.This paper analyzes and summarizes technical bottleneck,breakthrough measures and future development prospect of domestic needle coke by comparing processes as well as physical and chemical properties.

This paper shows a successful case that low-sulfur fat coal from Russia instead of domestic high-sulfur fat coal,blended with high-sulfur prime coking coal achieved satisfactory result of coal blending,with stable coke quality and lower cost in coal blending.Through 40 kg pilot oven test,ash composition analysis and microscopic analysis etc.,the properties and application of the low-sulfur fat coal from Russia were analyzed.When the volatile ratio in the fat coal from Russia exceeds 33%,and the blending ratio of that is less than 5%,there would be no obvious influence on mechanical strength and CRI/CSR;when the blending ratio of the fat coal exceeds 7%,CSR deteriorated significantly.

Introduction is made to the sample preparation for the current measurement of CRI and CSR.After improvement for the current sample preparation method,the uniformity of coke sample granule can be upgraded,with same shape,and accuracy and repeatability of test result in CRI and CSR can be remarkably increased.

This paper thoroughly analyzes the process and causes of coke burning loss during coke dry quenching.It also puts forward the feasible measures to minimize the burning loss and to monitor the rate of coke burning loss, which is beneficial for guiding coke dry quenching operation.

During annual maintenance for CDQ system in Anyang Iron & Steel,the coke moisture stays high and fluctuates.In view of the factors influencing the coke moisture,measures were taken such as to standardize coke receiving by quenching car,to control dewatering time and coke discharging on the coke wharf,to optimize quenching time for high and low water volume,as well as to minimize the quenching water volume to maintain the coke moisture around 8% on the premise of no red hot coke so as to ensure stable operation of blast furnace.

Based on the features of double sloping flue in CDQ chamber, the scheme for maintaining the double sloping flue was put into practice,the feasibility of the maintenance technology was tested and solution of stabilizing the CDQ chamber temperature was put forward.As a result,the service life of the double sloping flue can be effectively extended.

Introduction is made to the development and application of intelligent type management and control system in General Coking Plant of Ansteel, including informatization management for the operator ID card after the system put into operation, surveillance management for energization/de-energization of the equipment in maintenance so that potential risks of the conventional ID cards can be avoided and intrinsic safety in operation and maintenance can be realized.

In this paper,introduction is made to the technology of replacing the rubber belt for the whole tubular belt conveyor in Coking Plant of Ningbo Steel.This technology realizes not only the belt localization in China,but also upgrading in the belt production,transportation and replacement method so as to remarkably improve the belt changing efficiency,which can be used as practical guidance for fast belt changing by whole unit of the belt conveyor.

In this paper,H-fin sub-economizer is introduced in aspects of structure,working principle,characteristics and actual operating condition.Suggestions are also put forward for operation,which can be used as reference for the H-fin sub-economizer in operation of CDQ system.

Comparison is made to the features of different long span steel structures.Different structures of storage yard for coke plant are given according to different processes,equipment and locations.Based on project cases,solution is put forward in case of too large horizontal force on the foundation of long span yard.Summary is concluded for the common problems and solutions in design,such as temperature stress,support design,structure design，parameters selection,and gable wall enclosure,etc..Optimized design for the large span latticed shell structure is provided based on accumulated experiences.

In this paper,a study is conducted for simulation of ammonia spray structure in two-stage absorber for DeSOx and DeNOx of waste flue gas by active carbon process.Based on the results from pilot tests and by adopting CFD simulation,a new streamline technology is studied,i.e.a big range of flow rate-concentration waste flue gas is uniformly mixed with air-NH4 mass fraction and evenly distributed by regulating mixed fraction supply and optimizing ammonia nozzle arrangement so as to improve the uniformity of ammonia distribution above the nozzles.

Analysis is made to the problems in raw gas primary cooling by utilizing waste heat from flushing liquor for current chilling.After taking measures,like treatment for the flushing liquor by stages,optimization for raw gas primary cooling process and increasing the temperature of the flushing liquor into the refrigerator,satisfactory results can be obtained such as higher efficiency of refrigerator unit,lower cost of the unit,and avoidance of blockage in flushing liquor nozzle or tar jamming inside the GCM so that safe and stable operation can be ensured.

Ammonia stripping parameters optimized by Aspen Plus are introduced.The second absorption type hot pump is adopted for ammonia stripping technology by using energy-saving hot pump,which will recover the latent heat of ammonia vapor from the top of the ammonia stripper.Compared with the conventional ammonia stripping,this optimized technology can not only ensure the NH3-N content no higher than 100 mg/L in the stilled water at bottom of the stripper,but also dramatically decrease the L.P.steam consumption during ammonia stripping,i.e.no higher than 100 kg/h for treating per ton of coal water.

Without changing feedstock and process flow,only by increasing coal tar treatment load,the process parameters of coal tar unit under different loads can be tracked such as the treatment capacity,equipment operation,products yield and quality,energy consumption,and process control,etc..so that the operating conditions of the coal tar unit under different loads can be explored.

In this paper,main equipment and processes for producing small tonnage tar products are introduced.Optimization is given by adding liquid seal and flow control device on side-cut line of the negative pressure intermittent distillation column so that actual process requirement can be met,economic benefit can be maximized and full play can be given to the advantages of small tonnage products,with annual economic benefit of 1 million yuan.

Through computer simulation plus pilot tests,study is conducted in this paper for the mechanism of waste gas recycling technology influencing combustion process in the combustion chamber.Comparison is also made for the changes of NO produced in vertical flues under different amounts of waste gas to be added.This technology could help reduce the O2 content in the combustion air and minimize the NO formation at high-temperature position in the flues,i.e.when the amount of waste gas to be mixed reaches up to 40%,the NO in the waste gas could be cut by about 70%.

Comprehensive treatment technology and measures are introduced in this paper for 6 m coke oven P.S.emission control during production.Difficulties in emission control are analyzed.An idea of taking effective measures according to different actual conditions is put forward.Combination of major and minor measures is adopted for effective treatment of the pushing emission during the entire pushing process.Remote control is realized.

Due to the shutdown of some coke ovens,the coke oven gas volume drops sharply,which directly causes temperature drop of Claus furnace.For this reason,COG must be added to maintain normal temperature of Claus furnace.The content of carbonyl sulfur (COS) in Claus tail gas is high after blending with COG.By continuously adjusting the gas blending amount into the Claus furnace,it can not only ensure normal temperature of Claus furnace,but also control the COS in tail gas not too high.

This paper introduces an application of waste water treatment,i.e.the waste water generated during semi-coke production will be converted to high temperature steam by recuperative evaporator and hot stove,which is used as process steam during production of coal-based active coke and creates a new idea for semi-coke waste water treatment.