摘要
利用自主设计的高温微型流化床对煤粉在1 100～1 300℃温度范围内的两相流燃烧反应动力学进行了系统的研究.揭示了反应温度、气速、煤粉粒度以及氧气浓度几个方面因素对煤氧燃烧动力学的影响规律.结果表明,随着反应温度的提高,CO/CO_2比值由0.85不断下降到0.40,煤粉的燃烧效率得到了提高;随着流化气速的提高煤氧比逐渐降低,燃烧反应更加充分;在高温煤氧两相流燃烧过程中煤粉粒度对燃烧造成的影响不明显;当氧气浓度较低时,CO和CO_2的浓度曲线均呈现双峰特性,气体流速较小时,反应速率随氧气浓度增加不明显.
The kinetics of the coal-oxygen combustion of two-phase flow in the temperature range of 1 100~1 600 ℃ was systematically studied by using the self-designed high-temperature micro-fluidized bed. The effects of reaction temperature, gas velocity, pulverized coal particle size and oxygen concentration on the kinetics of coal combustion were revealed. The results show that the CO/CO2 ratio decreases from 0.85 to 0.40, and the combustion efficiency of pulverized coal is improved with the increase of reaction temperature;With the fluidized gas velocity increasing, the coal/oxygen ratio is gradually reduced and the combustion reaction is more efficicent;The effect of pulverized coal particle size on combustion is not obvious in the combustion process of high temperature coal-oxygen two-phase flow;Under the circumstances of low oxygen concentration, the CO and CO2 concentration curves show bimodal characteristics, and under the condition of slow gas flow rate , the oxygen concentration has little influence on the reaction rate.
作者
郭磊
程威
郭占成
GUO Lei;CHENG Wei;GUO Zhancheng(State Key Laboratory of Advanced Metallurgy, University of Science and Technology Beijing, Beijing 100083, China)
出处
《江西冶金》
2019年第2期14-19,共6页
Jiangxi Metallurgy
基金
国家重大科学仪器专项计划(2011YQ12003907)
