In this paper,the features of oven proper structure of new type large capacity coke oven and application in new technology for cokemaking are described.The vertical distribution of bracking force in different regions of new type large capacity coke oven is analyzed and demonstrated.A new concept in design for this type of buckstay is put forward.By numerical simulation,static analysis for the buckstay is made,and a suitable buckstay structure is obtained.

Analysis is made for two kinds of modified coals of Liulin high sulfur coking coal and Russian fat coal.Commonly-used coking coals of the same kind are also respectively analyzed.The result shows that the Liulin high sulfur coking coal and Russian fat coal belong to individual kind of coal of premium quality coking coal,with high G value and Y value,which are basic coal kinds for coal blending.The 20 kg pilot oven test shows that the two kinds of modified coals can produce coke of better quality and have high compatibility with other coal kinds.The commercial production shows that the two kinds of coals can improve coke quality and reduce the coal blending cost.

It is concluded that the main causes of cracks on the gooseneck are excessive angle of inclination at LP ammonia liquor spray nozzle,graphite deposited in the gooseneck,which needs to be frequently removed,as well as much impurities in the ammonia liquor.A new LP ammonia liquor spraying device can lower the gooseneck temperature,reduce the free space temperature on oven top to extend graphite cleaning intervals and improve the troubleshooting in case of PROven system failure,which can remarkably minimize the cracking on the gooseneck.Finally,cold welding process by manual arc welding is adopted to repair the gooseneck cracks and the result is satisfactory.

Since the circular storage yard is successfully used in the Coking Plant of Ningbo Steel,the experience in using this type of yard and the current problems are discussed in this paper in terms of coal stacking management,production management and drainage system management,etc..Relevant solutions are also given.

Buchanan coal is used for coal blending,replacing some regular coking coal,which has been tested by 40 kg pilot oven.The coke quality test shows feasibility of coal blending,i.e.small amount of Buchanan coal can replace Standa coking coal for cokemaking and the Buchanan coal is not suitable to replace Portland coking coal and Mazhen fat coal.

During coke oven production，wet quenching car travels frequently to carry and extinguish hotcoke，it would unavoidably damage the belleville spring assembly of travel wheel bogie in the wet quenching car.Therefore，analysis and adjustment is done for mechanical properties of the belleville spring assembly in aspects of overall structure，rigidity，friction loss，deformation energy and allowable stress，etc.，which can be used as reference for selection of the belleville spring assembly.

Detailed procedures of using carbon fiber composites for repairing the defective position of suction main is introduced.This application proves that the carbon fiber composites can effectively repair the defects at suction main and lower its operating risks.

This paper introduces the structure of coal cake conveying mechanism for large capacity stamp-charge battery,and analyzes the cause of coal cake collapse,and then puts forward measures to ensure the stability of coal cake when being conveyed,in aspects of coal blending requirement,stamping machine selection,requirement for the rigidity of coal cake box and height-width ratio of the coal cake,etc..

Enclosed type oven proper is a solution to fugitive emission escaped from coke oven battery.Two enclosed types are discussed in aspects of process design and steel structure.Steel structure of stay cables with large span is put forward as a solution.

In this paper, the harm of broken-chain in reversing device is described.Several detections are introduced against broken-chain.The function of the detection, alarm and interlock system can protect the coke oven against accident due to the broken tie rod system so as to ensure safe operation of the coke oven.

The importance of level measurement for the coking column in delayed carbonization process is introduced.Method of selecting level gauges for the coking column is described.Comparison is made between the γ-ray level gauge and neutron level gauge.Current situation and protective measures for the two level gauges are also introduced.

Different processes for modified pitch production,both at home and abroad,are introduced in this paper,in particular,the continuous production process for modified pitch by tubular furnace method under negative pressure,which has been put into commercial production at present.This process is characterized with low reaction temperature,long operation period,low energy consumption,environment-friendly production and stable operation,which is applicable to medium temperature pitch feedstock with low QI.

Based on the current design and operation status of oil and gas fired boiler house in coking industry and in experience of practical projects,comparison is made for the advantages and disadvantages of low-position thermal deaerator and high-position thermal deaerator in boiler feed water deaeration system as well as the their investment and operating costs.In the end,the low-position thermal deaerator is proposed.

It is not feasible to carry out COG desulfurization liquid salt extraction due to its complicated process,high operating cost,little demand in market and difficulty in startup.Through research for a new type desulfurizer in COG desulfurization,the PDS catalyst was changed to a new type of complex iron catalyst in 2018,which is proven to desulfurization effective with stable double salt content.

Coke oven waste gas recycling technology is adopted to control the NOx content from the source and to improve vertical heat performance so that gas saving,lowering standard temperature,more coke output and better coke quality can be realized.

Recirculation of coke oven flue gas is adopted for 7m battery to achieve low NOx combustion so that the NOx content in the flue gas is decreased from 560 mg/m3 to 247.5 mg/m3, and that in the emission discharged can remain below 80 mg/m3.The NOx emission is so remarkably reduced that the NOx emission control from the source can be realized.

Introduction is made to the application on start-up for DeSOx and DeNOx device of 7 m battery in Coking Plant of Bayuquan Iron & Steel Company.This practice can achieve stable operation of the DeSOx and DeNOx device at the quickest, which shows an obvious result and can be promoted and can be used as a demonstration.