Processes of coke oven flue gas desulfurization and denitrification  are introduced in this paper,as well as their integration technology combined in one equipment. Advantages and disadvantages of each de-SOx  and de-NOx process at present are also summarized,which plays a directive role in this technology development.

To meet the requirement of reducing ash content in coke by Masteel,13 kinds of coal blending schemes are determined based on each individual kind of coal from Huaibei coal mines,which have been washed and selected into different ash contents by coal dressing method.The blended coal quality and the coke quality produced from 40kg test oven are analyzed. The result shows that the blended coal ash content,ash catalytic index and caking property vary with the ash content of Huaibei coal,in which the Huaibei lean coal ash content decreases,and the coke quality increases accordingly.

By coal analysis and coke property test,the possibility of Xinzhou-produced gas coal replacing Fengfeng 1/3 coking coal is studied, including the best proportion.The test result shows that the Xinzhou-produced gas coal is an ideal substitute of Fengfeng 1/3 coking coal, its usage proportion is preferably controlled within 6% when the coke strength in hot state drops down very little,which can ensure a supporting bed in blast furnace.

Three kinds of coals with different metamorphism degree are studied for determination of coal grindability indices under different moisture.The result shows that the coal grindability indices are mainly related to metamorphism degree,i.e.there is a linear relation but not much between the coal grindability indices of different metamorphism degree and the moisture.

The feasibility is studied for reducing energy consumption in producing per ton of coke by increasing the cross wall coefficient for 7.63m coke oven.By stabilizing heating system,adjusting injecting plate and replacing checker brick,etc.,the uniformity of cross wall temperature can be improved,the cross wall coefficient can be increased and energy consumption for producing per ton of coke can be reduced.

The differences between CDQ boilers of high temperature plus high pressure and that of medium temperature plus medium pressure are introduced in aspects of design parameter and structure.Comparison is also made in respects of water quality,air\|fuel ratio,vaporization rate and circulating gas,etc.based on the actual operating parameters of the CDQ boiler in Baosteel.In addition,analysis is made for the related differences in design for the CDQ boiler.Suggestions are also given for improving Baosteel CDQ boiler operation in the future.

The causes of damage to the PROven fixed cup are analyzed.Solution to the fixed cup maintenance in a safe manner is proposed so that the frequent damage to the fixed cup can be effectively solved and safety risk in maintenance can be minimized.

The high efficiency integration technology of waste heat recovery of coke oven ascension pipe gas is introduced.The performance of this technology is beyond the requirement of national standards,and the steam output is 27% higher than the requirement of national standards.The system can run stably and show good application effect.It can bring remarkable economic benefit.

The cause of door frame deformation for 6m coke oven is made.Solution is also given that the deformed door frame of empty coking chamber can be on\|line replaced in hot state which not only prevents the oven door from emission polluting due to poor sealing caused by door frame deformation,but also avoids the deformation on the bracing system such as tie rods,buckstays,etc.burnt by the flame.

CDQ bucket car locomotive technology for 7m coke oven is introduced in this paper.Improvement and optimization have been done for the problems and defects in production by modifying equipment and adjusting parameters,etc.so as to ensure a stable operation for the CDQ locomotive.

In this paper,working condition of 15MW condensing type turbine is analyzed.Fouling at turbine nozzle,the main cause of low efficiency is found.Three measures i.e.steam purging,hot water cleaning and cylinder-removal cleaning are given,including each feature,which can be selected according to actual situation.

Electromagnetic vibration feeder in CDQ unit and its internal structure are introduced in this paper.The steps for the coil replacement are described.The causes of burnt coil in the feeder are analyzed and preventive measures are also given.

Regarding to the problems on gas pipe during heating of coke oven,the reasons for water and gas leakage of the pipe are analyzed and concluded,based on which proposals are made to prevent corrosion of gas pipe.It can be used as a reference for other plants.

The process flow,interlock control and index requirement of the coke oven flue gas De-SOx & de-NOx system and waste heat recovery system are introduced.The structure and configuration of DCS as well as hardware configuration are designed in detail.The flue gas after treatment can meet the requirement of GB 16171—2012 Emission Standard of Pollutants for Coking Chemical Industry.

The temperature of raw gas at the outlet of gas collecting main is a key parameter for calculating cooling water demand and designing the primary cooler.By analyzing the cooling process of raw gas,a cooling model for the raw gas in the gas collecting main is established.The influence of dry coal water yield,clean gas yield,inlet temperature and outlet pressure of raw gas on the temperature of raw gas at the outlet is quantitatively analyzed.The outlet temperature of raw gas rises with the increase of dry coal water yield and raw gas pressure at the outlet,but it decreases with the increase of clean gas yield.

Based on the first principle of Density Functional Theory(DFT),the absorbability of H2S and HCN,the main corrosive substance in COG on Fe-based surface are analyzed as well as the bonding situation after reaction between the corrosive molecule and the basal body.The energy of adsorption and partial density of states are also calculated.The result shows that the interaction between H2S molecule and Fe appears more intensive than the HCN molecule,which indicates the H2S in COG is much more corrosive to the Fe-based surface.

Regenerative thermal oxidizer (RTO) is adopted to deal with the coking waste gas.The process of RTO unit is optimized.The result shows that the coking waste gas after treatment by RTO can meet relevant requirements of national standards.The purification rate of organic gas is up to 99%,which is a quite satisfying result.

Solvent extract-continuous settling process is adopted in the pre-treatment unit for the production of needle coke.This process has the advantages of high yield rate of refined pitch,stable quality and less consumption of solvent.However its drawbacks of blocking the settling system cause the system hardly run for a long time.The factors influencing the ratio of aromatic hydrocarbons to fatty hydrocarbons,solvent ratio and settling time are analyzed respectively.

The technology of “advanced oxidation process+desalination+ultrafiltration+reverse osmosis” is adopted for the advanced treatment of coking waste water.The quality of the waste water after treatment is better than industrial water.It can be used as make\|up water for regulation pond and circulating cooling water,so it brings good environmental and economical benefits.

With adoption of gas chromatography method to measure the content of naphthalene and methylnaphthalene in washing oil,the sample can be used and separated directly without pre-treatment.The peak area of each composition is determined first,and then the percentage of each composition can be calculated by area normalization method.

With a coking plant as an example and with petroleum oil sample leaking from tar tank as pollutant agent,a prediction is made by adopting analytical method for determining the pollutant shifting in the groundwater and area of influence under abnormal working condition.The result shows that the analytical method turns out to be rational and practical,which can be used in a scientific way and as theoretical basis to protect groundwater against pollution.

Mathematical simulation is done for ammonia stripping process by using Aspen Plus.A comparison is made between the simulation result and the actual value of Baosteel Zhanjiang plant.No deviation is found which proves that the model is correct and valuable both theoretically and practically.

A method of superheated steam flow calibration suitable for PLC program algorithm is proposed in this paper.Its principle is to make a fitting for the superheated steam density table by polynomial surface fitting algorithm and to convert it into a fitting formula based on PLC programming so as to obtain a more precise fitting.The test result shows that this method has higher precision,wider range of application,and much simpler in expression,suitable for PLC programming compared with the conventional empirical method.It has been adopted for several projects with satisfactory results.