Facing the problems in operation of medium and large-size blast furnaces using stamp-charge battery coke instead of top-charge battery coke,this paper expounds the research progress on the properties of SC-battery coke at home and abroad in aspects of macroscopic quality,microstructure and high temperature gasification reaction performance,and demonstrates the quality difference between SC-battery coke and TC-battery coke.As a result,the cognition to the characteristics of the SC-battery coke can be improved and the technology of medium and large-size BF using SC-battery coke can be further upgraded.

Analysis was made to the cold & hot strength and optical texture of the coke produced from 40 kg pilot oven of Lianyuan Iron & Steel based on commonly used coking coal and blending scheme.The test result indicates that as the degree of coal metamorphism goes further,the anisotropic texture increases first and then decreases,the coke from medium-grade metamorphism coal shows the highest anisotropic degree.Fiber texture and leaflet texture gradually increase with the coal metamorphism.Inert texture decreases first and then increases with the coal metamorphism; the medium-grade metamorphism coal has the lowest content of inert texture.As the proportion of the mosaic texture increases,the cold and hot strength of coke are getting better; with the proportion of coke inert texture increasing,the cold and hot strength of the coke will go worse.In order to ensure coke quality,the proportion of inert texture in coke should be controlled within an appropriate range in production.

Based on the principle of stabilizing coke size,this paper studies the coking process and coke size of 7.63 m coke oven in Shougang Jingtang company,analyzes the factors affecting the coke grain size,such as coal blending quality,carbonization time,quenching process,coke transfer and coke screening.By optimizing coke transferring,the material level of coke bin is controlled at least 3 m;special attention is paid to the moisture stability in coal blending,within the range of ±0.3%,in particular to the effective management of screening process to improve the stability of coke grain size.

The American Buchanan coking coal has advantage of low content in ash and sulfur,which can partially replace BHP coking coal and domestic coal and help reduce coal blending cost.However,its MBI and MCI are on the high side,this blending must be adjusted according to actual blending composition and resources condition.Based on the experience,the ratio of Buchanan coking coal to be blended is supposed to be 5%~7%,it would be beneficial to improving coke quality in an economical coal blending manner.Due to diversified coal blending structure with various kinds of coke quality in cokemaking,the optimum option shall be gradually defined according to actual situation.

This paper mainly introduces the technology of using new type coke bucket with refractory lining.In comparison with the conventional coke bucket with alloy liner plate,this paper shows the advantages of using refractory lining and analyzes its application in the Coking Plant of Ningbo Iron & Steel according to actual situation.

By comparison with slot type coke oven,the heat recovery coke oven is characterized with no producing “three wastes”(wastewater,waste gases and residues) and maximized using anthracite in coal blending.The steel complex,by using heat recovery coke oven,can not only minimize pollution,but also produce required quality coke for ironmaking,including high temperature steam for power generation,which could increase the proportion of self-generated electricity in enterprises for a considerable economic benefits.

This paper unleashes conventional 3D assembly mode，i.e.it adopts the top\|down design concept of Autodesk Inventor software，takes the design for lining brick of CDQ primary deduster as an example，explicates the parametric correlation design that starts from overall to local till every details.This concept will produce higher design accuracy in a shorter design period，in favor of brick quantity statistics and future design optimization，which will provide a reference for design of other industrial furnaces and their lining bricks.

This paper mainly introduced that through optimized coal blending process,especially the control of moisture content in coal blending and density of coal cake,over-stamping can be avoided.Besides,the operation management of coke oven was strengthened.As a result,the stamp-charge battery coke can meet the demand of large blast furnace above 2,000 m3.

The sulfur content in coke plays an important role in measuring the quality of coke.At present,the automatic sulfur meter is commonly used to measure the sulfur content of coke.The measurement indicates that the sulfur in quenched water stays mainly in the form of sulfate ions,and the SO2-4 has an influence on the sulfur content in coke,i.e.showing a positive relation with the sulfur content in coke.

The model of AS desulfurization process is established with Aspen Plus.Simulation is done by adopting Box-Behnken method to test the absorption effect of the AS desulfurization column.The correlation between H2S content at gas outlet and process parameter is analyzed.The process parameters are also optimized.After the optimization，the H2S concentration at the gas outlet can meet the requirement of production，which demonstrates that the model is accurate and the optimization is viable.

This paper introduced COG desulfurization process and the chemical reaction principle of complex iron catalyst in the desulfurization.It analyzed the main controlling targets in COG desulfurization as well as precautions in the operation.It also summarized the advantages and disadvantages in using the complex iron catalyst for COG desulfurization.

In view of the blockage in gas pipeline after the gas exhauster of Handan Iron and Steel Coking Plant,the main reasons are analyzed in this paper.After the improvement,the blockage has been alleviated,and long-term operating regime has been formulated to ensure that the pressure of the gas pipeline after the exhauster does not rise up.

Introduction is made to the crude benzene hydro-refining in this paper.Based on the experience of operating the crude benzene hydro-refining unit, this paper lists common problems in the production and gives solutions,which would be helpful to the design and production.

Among the gas treatment plants in coking industry，the non-standard BPP equipment are relatively unique and can be clearly sorted，which could be of an ideal start to develop parametric design.By sorting the equipment and analyzing computer software，this paper looks forward to the future parametric design scheme for the non-standard BPP equipment.

By comparison between process flows of benzol removal with rich oil heater and that with tubular furnace, this paper analyzes the process features of rich oil heater for benzol removal,describes the technical proposal and details for its improvement as well as the practical data.The replacement of tubular furnace with rich oil heater for benzol removal can avoid emission into the atmosphere, which will go in line with a green sustainable development in coking industry.

At present,coking plants have four kinds of sorting treatments for organic waste gas,i.e.water spray absorption method,reagent absorption method,sorbent absorption method and photocatalytic oxidation method.By comparison among the above methods and through sorting treatment,zero discharge of organic waste gas from coking plant can be realized and it would bring economic benefit to some extent.

The integrated technology of multiphase miscible nano air flotation enhanced flocculation+AAO biological treatment+ozonation+double membrane(ultrafiltration+reverse osmosis)is adopted to treat coking wastewater by method of sectional control so as to realize zero dilution of wastewater treatment.The concentrated water is sent to the blast furnace for slag washing,without additional fresh water and without external drainage so that water resources can be saved.

This paper introduces the main technologies in DeSOx and DeNOx for coke oven flue gas and analyzes the characteristics of different desulfurization and denitrification processes.Through analysis for the 6 m coke oven of Masteel,an optimal process is determined according to the composition of the flue gas so as to meet ultra-low emission requirement.

This paper analyzed the source of fluoride in wastewater in Shaoguan Iron & Steel and discussed its treatment solutions.Source treatment or end treatment could be applied to reduce fluoride from wastewater.The source treatment focuses on minimizing fluorine-containing raw materials or optimizing the process flow.The end treatment can reduce fluoride from 200 mg/L to about 10mg/L, and the removal rate is about 95%,by methods of precipitation,adsorption, and ion exchange etc..

This paper introduces the technology of coke oven flue gas treatment in Liuzhou Iron & Steel,i.e.“Soda DeSOx (SDS) process+Medium & low temperature SCR DeNOx+Waste heat recovery”,including its environmental targets.It also analyzes the problems occurred in operation and puts forward solutions.