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Table of Content

28 May 2010, Volume 41 Issue 3
Present situation of needle coke produced from coal pitch
Liu Guangwu1 Xu Zuofeng1 Cao Shili 2
2010, 41(3):  1. 
Abstract ( 560 )  
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The needle coke formation basic principle, production method, market situation, domestic production and application present situation were introduced. The domestic production technical level was analyzed, and the suggestion for domestic construction project was put forward. It was considered that the macroeconomic control should be strengthened, the development should be greatly strengthened, the product quality should be improved in stead of increasing output in the blind way.

Applicable study of waste activated carbon in coal blending for coke-making
2010, 41(3):  5. 
Abstract ( 1103 )  
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The coal blend and coke-making experiment was conducted on 5 kg test oven to study the influence of additive amount and grain size of waste activated carbon, the result showed that it was feasible that in coal blending and coke-making lean coal was replaced by a certain amount of waste activated carbon, when the blending amount and grain size of waste activated carbon were respectively controlled at 0.5%~2% and 0.5~1.0mm, there was no influence on cold strength and hot strength of coke. To replace lean coal for coke-making with waste activated carbon can reduce the cost of coal blend, and the issues of wasting resource and environmental pollution can be effectively solved.                   

Application of high temperature and high pressure boiler in CDQ project
Ren Zhong Liu Haijun
2010, 41(3):  8. 
Abstract ( 992 )  
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In combination with the rating data for various kinds of CDQ boilers and constraint factor existed in selection process of CDQ boiler, the factors such as productivity of CDQ, project investment and enterprise present situation were compared and analyzed, which has provided a suggestion for selection of boiler type for CDQ project. At the same time, against high temperature and high pressure natural circulation CDQ thermal system and medium temperature and medium pressure combined circulation CDQ thermal system, the difference of energy-saving, boiler efficiency, steel consumption, system electric power consumption, power generation capacity as well as the difference between boiler start-up and running were compared and analyzed, every advantage and disadvantage of thermal systems of two parameters were understood furthermore.                

Influence of coal charge moisture on coke-making process and coke quality
Bao Junfang Xue Gaifeng Chang Hongbing
2010, 41(3):  11. 
Abstract ( 1008 )  
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By measuring coal bulk density, temperature rise rate and crucible coke nature when coal charge moisture were respectively 1%, 6% and 12%, the influence of coal charge moisture on their nature was obtained. Although there was no big influence on coal charge nature lower coal charge moisture by lowering coal charge moisture, the dynamic state of coal charge in the coking process in oven chamber has changed substantially, which can greatly increase coke oven productivity and improve coke quality. When coal charge moisture was 1%, coal charge bulk density, temperature rise rate and nature of crucible coke were much better than that of coal charge moisture of 6% and 12%.        

Development of wear-resistant pre-fabricated block and its application on CDQ chamber

Li Jun Cao Hongshen Wang Lihui Xu Zhidong Song Fei1
2010, 41(3):  14. 
Abstract ( 648 )  
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The development achievement of wear-resistant pre-fabricated block which has been used on CDQ chamber of Baosteel was introduced. The wear-resistant pre-fabricated block has the excellent performance of falling resistance, good thermal shock stability, high strength and wear resistance. The result of actual application at Baosteel showed that the conventional burnt mullite brick used at the same location of CDQ chamber was replaced by the wear-resistant pre-fabricated block, the wear rate of wear-resistant pre-fabricated block was reduced by 70% or more, the service life of refractory used at the cooling zone of CDQ chamber can be substantially increased, and the repair frequency and consumption of refractory can be reduced.

The system for measuring oxygen content in coke oven burnt flue gas

Yang Hongren Wang Jingrong Wang Xuelei
2010, 41(3):  18. 
Abstract ( 688 )  
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The system for measuring oxygen content in coke oven burnt flue gas was introduced, this system can respectively take the samples of burnt flue gas from sole flues of several regenerators, and oxygen content in burnt flue gas was measured with one ZrO oxyen analyzer. In auto mode, automatic measurement of oxygen content in several downflue regenerators can be completed in one reversing cycle; In manual mode, the single regenerator can be continuously measured. The system is characterized by higher measuring accuracy, stronger real time ability, lower cost for investment and less maintenance, which has provided a measuring basis for judging the combustion condition of individual combustion chambers of coke oven.

Pneumatic delivery and utilization of dust collected from coke-making production

Yang Jianhua She Shiyun
2010, 41(3):  21. 
Abstract ( 488 )  
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The principle, flow, feature, running of pneumatic delivery of dust collected from coke-making production as well as dust collected from coke-making production which is used for blast furnace pulverized coal injection were introduced, the key technical issue was studied. The production practice showed that long distance non-pollution delivery was realized in pneumatic delivery mode, material can be taken and discharged in many points, the process was automatically controlled. Dust also can be mixed quantitatively with pulverized anthracite injected into blast furnace, part of anthracite can be replaced, so that comprehensive utilization of non secondary pollution of dust collected from de-dusting was realized.     

Analysis and comparison of circulation mode and parameter of CDQ boiler
Jiang Fu Chen Bencheng
2010, 41(3):  25. 
Abstract ( 931 )  
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Against the development tendency of CDQ boiler of new CDQ project toward high temperature and high pressure and natural circulation, in combination with the past engineering practice, in view of technical and economic aspects, the determination of CDQ  boiler parameters, proposal selection and three kinds of circulation modes were deeply and rationally analyzed and compared. It is suggested that high temperature and high pressure boiler should be used in large-scale CDQ system.  

Application of new process of gas naphthalene removal in Masteel
Shen Lisong Bi Zhenqing
2010, 41(3):  38. 
Abstract ( 716 )  
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The process, equipment and energy consumption of gas naphthalene removal were studied. The new process of coke oven gas naphthalene removal developed by Masteel was introduced, one step naphthalene removal of gas  was completed in cross tube primary gas cooler, after gas purification there was no other naphthalene removal unit. The average resistance of primary gas cooler was below 1 000Pa, primary gas cooler was not cleaned with steam, gas purification equipment was never blocked by naphthalene, 12 000t standard coal can be saved annually, the energy-saving effect was obvious.

Modification of dephenolization process of tar plant of coking plant of Anyang Iron and Steel Co., Ltd

Hao Xuemin Meng Lingkun Huo Li
2010, 41(3):  41. 
Abstract ( 492 )  
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According to the conditions of low efficiency of dephenolization, standard exceeding phenol content in naphthalene, poor neutral oil removing and dewatering results from phenolate, environmental pollution by intermittent phenolate decomposition, easy blockage of continuous phenolate decomposition column, low yield of crude phenolate and so on, crude phenol yield is raised and operation environment is improved through the process and equipment modifications of enlarging the capacity of buffer tank, changing steam source for the stripping process, increasing the packing in the stripping column, replacing the packing in decomposition column, installing agitator in intermittent decomposer and heater in the intermittent scrubber and so on.