LI Pengpeng;REN Qiangqiang;LYU Qinggang;WANG Chao;ZHANG Chi;HAN Shaobo;

• 1:School of Energy Power and Mechanieal Engineering
• 2:China North China Electric Power University
• 3:Institute of Engineering Thermophysics
• 4:Chinese Academy of Sciences

Abstract：

In the dry cement production technology, fuel combustion and raw material decomposition in the calciner have important effects on cement quality and pollutant emission. Compared with the combustion of fuel directly injected into the calciner, the combustion performance of the fuel in the calciner can be improved and the emission of harmful gases can be reduced by the preheating treatment, and the fuel adaptability of the cement calciner can be increased. The preheating characteristics of coal and biomass mixed fuel preheated by circulating fluidized bed before entering the calciner was studied, that was, the influence of different factors on solid preheated fuel and gas. The results show that the increase of oxygen-carbon ratio(molar mass ratio of O_2 to C per unit time) will lead to more intense reaction and particle collision in preheating furnace, resulting in a decrease in the particle size of preheated fuel. At the same time, the ash content of coke produced by coupling preheating of coal and rice husk increases and other components decrease with the increase of oxygen-carbon ratio. The heating of external heat source can significantly increase the generation of effective combustion components of gas such as CO, CH_4 and H_2, and improve the conversion rate of each component in solid phase fuel.

Key Words： cement;precalciner;biomass;circulating fluidized bed;fuel preheating

Abstract:

Keywords:

Foundation: 中国科学院战略性先导科技专项资助项目(XDA29020200)

Authors: LI Pengpeng;REN Qiangqiang;LYU Qinggang;WANG Chao;ZHANG Chi;HAN Shaobo;

DOI: 10.13226/j.issn.1006-6772.SG23062101

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