Experiment Study on the High-Temperature Thermal Treatment and Ultra-Low NOx Control of Solid Waste Coal Slime in Circulating Fluidized Bed

作     者：SONG Guoliang XIAO Yuan YANG Zhao YANG Xueting LYU Qinggang SONG Guoliang;XIAO Yuan;YANG Zhao;YANG Xueting;LYU Qinggang

作者机构：Institute of Engineering ThermophysicsChinese Academy of SciencesBeijing 100190China University of Chinese Academy of SciencesBeijing 100049China Dalian National Laboratory for Clean EnergyDalian 116023China 

出 版 物：《Journal of Thermal Science》 (热科学学报（英文版）)

年 卷 期：2022年第31卷第6期

页      面：2244-2251页

核心收录：

学科分类：083002[工学-环境工程] 0830[工学-环境科学与工程（可授工学、理学、农学学位）] 08[工学] 0817[工学-化学工程与技术] 

基　　金：financially supported by the National Key Research&Development Program of China(Grant No.2018YFB0605002) “Transformational Technologies for Clean Energy and Demonstration”,Strategic Priority Research Program of the Chinese Academy of Sciences(Grant No.XDA21040100)。 

主　　题：solid waste coal slime thermal treatment CFB NOx post-combustion 

摘      要：Coal slime is a kind of solid waste and inferior fuel, which is urgently needed to utilize. In this paper, a high-temperature thermal treatment of coal slime in a circulating fluidized bed(CFB) was attempted to achieve resource utilization. In the experiment, the combustion characteristics of dried coal slime during high-temperature thermal treatment were investigated in a 0.5 MW pilot-scale CFB. The stable fluidized combustion of dried coal slime was realized. When the excess air ratio was closer to 1.0, the furnace temperatures would be uniform. The ignition method of dried coal slime was changed correspondingly while the feeding position changed. However, feeding coal slime to the loop seal was instrumental in decreasing NO_(x) emissions. Moreover, the NO_(x) emissions were tried to further control by the post-combustion technology. Post-combustion technology could significantly reduce NO_(x) emissions below 50 mg·Nm^(-3) while ensuring combustion efficiency. Besides, it was found that there was an optimum excess air ratio in CFB of about 0.9 resulting in minimum NO_(x) emissions of coal slime. The experiment results could well guide the industrial-scale high temperature thermal treatment of coal slime.