Through research & development of sinter cooling in shaft chamber and its waste heat recovery,the technical bottlenecks are tackled and the technologies of sinter cooling in shaft chamber and its waste heat recovery are established based on CDQ  design philosophy.The result shows that the technologies can effectively improve the rate of resource recovery and secondary conversion efficiency and reduce energy consumption in sintering production.

In view of the unpredictability for the caking properties of blended coal,a bottleneck in coking industry,due to mixing with low caking coal,thus comparison is made for the impacts to the blended coal caking properties between two scenarios,i.e.blending with two kinds of low caking coals (5%~25%) individually and blending with them both.The result shows that for most of caking properties of the blended coal,there will be a clear linear dependence between the values predicated and measured when blended with the said two kinds of low caking coals.It is found that the value b can also be accurately predicted by the equation in this paper.

Numerical simulation of NOx formation is done for the multi\|concentration fields of waste gas recirculation combustion inside coke oven vertical flues.The impact of air and gas inlet size and waste gas recirculation to the NOx formation is studied.The result shows that most of NOx is formed at the high temperature zone in the middle of rising vertical flue.Increasing external gas circulation would reduce the combustion temperature and narrow thermal peak so as to decrease the NOx formation.When the external circulation rate is 20%,the maximum temperature is lowered by 88 ℃  and the temperature field gets more uniform.When the inlet area is cut by half,the internal circulation rate is increased to 1.95 times and the NOx emission is reduced by 13.7%.

Since problems are found in two blocks of 7.63 m coke oven in Masteel,i.e.the worsened flatness of oven roof and displaced charging hole,revamp is done by restructuring the charging hole frame,re-bricklaying oven roof,re-leveling the charging hole elevation and making a roof slope.Additionally,the roof material is upgraded and the bricks for emergency evacuation lane is modified.All these revamps can be used as reference for similar projects in China.

The rule of SO2 variation in waste flue gas is studied.By doing experiments and analyzing data,designers can be able to obtain the basis for design of waste flue gas purification,even more accurate measurement for SO2 variation by adjusting operation and upgrading test method,etc..

In the process of cokemaking，the atmospheric pollutant discharged from coke oven chimney is referred to as the waste flue gas after COG combustion，mainly including SO2，NOx and emission，etc.，which are the major causes of environmental pollution.By analyzing the mechanism of NOx formation in the waste flue gas and adopting the technology of COG dilution，the content of NOx in the flue gas can be dramatically reduced and the generation of NOx，therefore，can be rooted out.

Through CDQ project examples,analysis is made for the impact of CDQ boiler related data,such as main steam parameters,condensation parameters,circulating water efficiency and steam turbine efficiency,to the CDQ thermal system investment and its power generation capacity.For increasing power generation capacity of the CDQ thermal system,comparison should be made in terms of investments and profits to single out an optimum option before the stage of engineering.

The condition of improving the CDQ circulating gas cooling technology and the related equipment,i.e.the circulating gas cooler,is generally described in this paper.The CDQ circulating efficiency is improved,safe and stable operation of the CDQ system can be ensured.

With upturning of steel industry,4.3 m coke oven battery that has been cooled down to normal temperature can be repaired.The current situation of the coke oven refractory brickwork is introduced,including the brickwork repair procedures and precautions.The repaired coke oven can be put back to production,with less emission and flame leakage.

With upturning of steel industry,4.3 m coke oven battery that has been cooled down to normal temperature can be repaired.The current situation of the coke oven refractory brickwork is introduced,including the brickwork repair procedures and precautions.The repaired coke oven can be put back to production,with less emission and flame leakage.

The recuperative cooler for CDQ dedusting system has high temperature at inlet and outlet,which frequently causes alarm and shutdown of the dedusting fan,even interruption of CDQ production.Thus an air valve is added before the recuperative cooler to cool down the dedusting system and improve its operating condition.The result turns out to be satisfactory.

Application of light wash oil replacing that of national standard for crude benzol production in the Coking Plant of Liuzhou Iron & Steel Co.,Ltd.is introduced in this paper.The statistics shows that the light wash oil can obviously improve the quality of circulating wash oil and reduce its consumption.

The current asphalt products in market and their producing processes are briefly discussed.A new process for commercial production of coal tar refinery,in combination of distillation and extraction,is introduced,which has features of diversified asphalt products,easy operation,safety and reliability and high quality as well.

Several modified pitch granulating processes are introduced.The new process of pitch pressing under water is described in details.Improvements are made in terms of pitch granulation temperature,pitch molding pump selection,use of nozzle for pitch molding machine,pond water flow and pitch forming,etc..

The waste heat of flushing liquor is recycled to power Li-Br chiller for producing 16～18℃ chilled water which will be used by primary cooler,desulfurization pre-cooler and final cooler etc.,so that energy consumption such as fuel gas,steam,and the like can be saved.

In this paper,introduction is made for technologies of recycled tar residue in coal blending,recycled coke breeze in coal blending,coke dust recycling,and coking sludge treatment.Discussion is also made for their advantages and disadvantages,which can be used as a reference for selecting waste solids treatment process.

Waste quenching water is treated by oxidation-coagulative sedimentation process.The result shows that this process is running good, with the treated water quality in line with the indirect discharge requirement listed in table 1 of national standard GB 16171—2012, which can be used as make\|up water for quenching.

Discussion is made for recovery,delivery and harmless treatment for VOCs in coking industry.Study is also made for the technology of introducing VOCs containing vent gas into negative pressure gas system.Suggestions are given for environment protection during this treatment.

A modification has been done for the existing coking waste water system according to the effluent behaviors and water quality.A new bio-process with built-in type packings can increase the efficiency of total nitrogen removal from 58% to 95% and can control the total nitrogen content lower than 20 mg/L at the plant outlet so as to meet the requirement of waste water discharge.

Since thiocyanide is the most important factor influencing de-nitrification in the phenol cyanide effluent,pre-decyanation tank is therefore added before the conventional bio-chemical treatment system as modification,which can dramatically reduce the content of thiocyanide in the effluent to ensure a stable running of the downstream bio-chemical system.