ZHU Shujun, LI Jiarong, ZHU Jianguo, PAN Fei, ZHANG Yi, LIU Wen

(1. Institute of Engineering Thermophysics, Chinese Academy of Sciences, Beijing 100190, China; 2. School of Engineering Science, University of Chinese Academy of Sciences, Beijing 100049, China)

Abstract: Based on preheating process of circulating fluidized bed (CFB), the characteristics of preheated fuel under different nitrogen concentration were studied. It is obtained that nitrogen concentration in the preheating process has a greater impact on the temperature of the riser, but it has few impact on the temperature of the preheated fuel at the exit of the cyclone, that is, the temperature of preheated fuel flowing into the rear downstream combustion chamber. The low heating value of preheated gas decreased greatly, which affected the combustion stability, even led to the flameout. Simultaneously, it is obtained that with the increase of nitrogen concentration, the conversion rate of each component decreases, which directly reflects that the increase of nitrogen concentration slows down the chemical reaction rate in the fluidized bed. In addition, above 40% of fuel-nitrogen had been transformed in the preheating process, which played a key role in the NOx emission of the test system.

Keywords: nitrogen concentration; char; preheating combustion; circulating fluidized bed

中图分类号：TQ534

文献标志码：A

收稿日期： 2018-11-16，修回日期:2019-01-15，在线出版时间：2019-01-18 10:20。

基金项目：国家重点研发计划项目，编号：2018YFB0604201。

第一作者简介：朱书骏(1992—)，男，博士研究生，研究方向为煤的清洁高效利用。E-mail：zhushujun@iet.cn。

通信作者简介：朱建国(1977—)，男，博士，副研究员，硕士生导师，研究方向为煤的清洁高效利用。E-mail：zhujianguo@iet.cn。