As an important industrial material in the development of carbon material,demand on the needle coke increases sharply.However,the yield of needle coke is limited and the cost is high,because the raw material for production of needle coke is in shortage.The industrial status,price trend and development prospect of needle coke are discussed.

This paper describes a minimized fuel cost in ironmaking by fully utilizing cow manure and by improving the combustibility of pulverized coal and decreasing the use of pulverized coal and cokes to build a eco\|friendly steelworks,which will have a broad prospects in application.

Different proportions of steel slag were added to the 1/3 coking coal to produce coke，and the properties of coke produced were studied.The result showed that the amount of steel slag should not be too high to control the content of ash and sulfur in coke.The reactivity of coke increased with addition of steel slag increased，while the coke strength after reaction decreased.With same amount of steel slag added，the smaller the grain size，the greater influence on the thermal property of coke.The specific area of coke increased first and then decreased as the solution loss reaction continued.SEM study showed that there was no obvious change in pore structure when the addition of steel slag is less than 5%.

The formation mechanism and influence factors of thermal NOx during coke oven heating are investigated by using CFD numerical simulation method，which chooses one couple of heating flues of a 6m BFG-firing coke oven battery.The results show that the excessive air ratio has a great influence on the formation of NOx，i.e.with the increase of the excessive air ratio，the NOx concentration first increases and then decreases.The heat flux also has a significant impact on NOx formation.With the decrease of the heat flux，the maximum temperature of combustion increases and the amount of NOx formation increases.For different heat flux value，the excessive air coefficient on the temperature distribution and concentration distribution of NOx in heating flue are different.

Based on the application software FLUENT in Computational Fluid Dynamics (CFD) and by using Eulerian multiphase flow，we carried out a simulation for heat transfer between coke particles and circulating gas with a 140t/h CDQ system of a coking plant to demonstrate the feasibility of this method and verify the correctness of the calculation results.Through the analysis of the results from several CDQ calculating conditions，we can also show the capability of multiphase flow model to describe the temperature variation of different grain\|sized coke.

This paper studies quality indices of coking coal,such as Audibert-Arnu dilatation,caking property,value Y of the maximum thickness of gelatinous layer and volatile,etc.It also analyzes the correlation of the Audibert-Arnu dilatation of diversified coal kinds and the above-mentioned indices.The result shows that the Audibert-Arnu dilatation varies with the degree of metamorphism of coking coal,which will give directive guidance for coal blending.

Three typical coking coals are selected to study the CRI and CSR of coke and the change of fractured surface before and after adding different proportions of inert material,of which the proportions are determined according to the caking property and active inert composition ratio of each coking coal.

Concerning the problems of intermittent black smoke and high content of NOx in the tail gas，the influence of standard temperature of coke oven，reversing process and excess air factor on the generation of NOx is studied. Proper heating conditions are finalized according to the influencing factors.

This paper introduces all the preparations before coal charge during start-up of 7m coke oven.It realizes zero crude gas bleeding from initial coal charge during the start-up,which not only minimizes pollution to the atmosphere,but also increases the by-products recovery yield,such as coal tar and crude benzol products.

In this paper，analysis is made for the causes to the damage at outer shell of the inlet duct of WHB (waste heat boiler).Improvements are also given for a better inlet duct lining structure，i.e.the original monolith concreted arch is changed to wedge type brick-laid arch structure，which runs very well without any problem and with extended service life of the WHB inlet duct，stabilized CDQ production and less operating cost.

This paper analyzes the causes of frequently-happened hard push for 6m coke oven battery.It also gives countermeasures to successfully control the hard push,such as by optimizing coal blending,minimizing graphite formation on the heating wall,keeping a rational inventory of coal yard and controlling pushing current,etc.

Based on the main factors impacting the coke thermal properties, this paper analyzes and describes the development and application of a testing technology for coke thermal properties for sharing experiences and reference in cokemaking industry.

The technical features of desulfurization technology and low temperature denitration technology for coke oven flue gas are analyzed.The coke oven flue gas de-SOx & de-NOx project of Zhanjiang Baosteel is introduced with respect to the technology,commissioning and result.This is the first successful industrialized plant for de-SOx & de-NOx of coke oven flue gas,which works stably and meets the standard requirements.It can be taken as a reference for other projects.

Domestic and abroad situation and technological development of special raw material for production of special coke,as well as the technical indices of high quality binder asphalt,high quality impregnant asphalt,low cost and high quality self sintered mesophase coke powder are introduced.

The coke oven flue gas goes to the de-NOx system to remove NOx,passes the waste heat boiler system to reduce temperature and generate low pressure steam,and then travels through the de-SOx system and de-dusting system to remove SOx and dust respectively.Finally the discharged waste gas meets the relevant requirements stipulated in Emission Standard for Pollutants in Coking Chemical Industry GB 16171—2012.

The mechanism of dry desulfurization of coke oven gas is studied.Problems found during operation are analyzed and countermeasures are made.It is proved that the improvement is effective.

The main reason for the increasing pressure difference between catalyst beds in the pre-reactor of hydro-refining plant is analyzed.Different regeneration processes are compared.Catalyst unloading and regeneration procedures for ex situ regeneration are introduced.

Based on the features of different media and many years experience on instrument maintenance,the reasons for the blockage of transmitter pressure pipe are analyzed and corresponding solutions are provided.It provides a reference for similar problems in other plants.

Concerning the deterioration of solvent quality of hydro-refining system，solvent-heavy oil separation device is provided to ensure good quality of the solvent and continuous regeneration of solvent，providing a sound basis for the stable operation of the hydro-refining system.

The fluctuation of circulating solution in the desulfurization column is analyzed.The problem of air lock in the solution pipe flowing by gravity from the regenerator to the desulfurization column is solved by installing a vent pipe.Therefore the production of the desulfurization unit is stabilized.

A Low temperature physical separation technology for tar residue is developed to deal with the problems of sticking to the belt,uneven mixing and late treatment which are found during coal briquetting with addition of tar residue.After separation,the water content in the tar residue is very low,so these problems are solved.Part of coal tar can be recycled to protect the environment.