LIU Wen1,2，OUYANG Ziqu2，CAO Xiaoyang2，MA Hongzhou1,2
(1. School of Engineering Science，University of Chinese Academy of Sciences, Beijing 100049, China; 2. Institute of Engineering Thermophysics，Chinese Academy of Sciences, Beijing 100190, China)
Abstract: A fuel preheating technique was proposed to achieve coal flameless combustion and de-NOx emissions. Experimental research was carried out with Shenmu bitumite, and coal preheated characteristic and variation law of flue gas compositions in flameless combustion were discussed. The results show that Shenmu bitumite can be preheated up to above 800 ℃, and the high-temperature coal gas generated by coal preheating has strong reducing action, which contains mainly CO, H2, CH4, N2 and CO2.Stable flameless combustion can be achieved with preheated fuels in down-fired combustor, and the temperature distribution is uniform and the peak temperature is low in combustor.NOx is generated near the fuel nozzle and reduced mainly in the main combustion zone, and the final NOx emission value is 107.64 mg/Nm3 (@6%O2).The generation of NO can be controlled and NOx yield can be reduced by rational combustion organization.
Keywords: NOx; preheat; flameless combustion; coal
中图分类号：TU7
文献标志码：A
文章编号：1008-5548(2019)01-0014-07
DOI:10.13732/j.issn.1008-5548.2019.01.003
收稿日期： 2018-08-29，修回日期：2018-10-16，在线出版时间：2018-12-21 17:00。
基金项目：国家重点研发计划项目，编号：2017YFB0602001。
第一作者简介：刘稳(1993—)，男，博士研究生，研究方向为煤粉无焰燃烧技术。E-mail：liuwen@iet.cn。
通信作者简介：欧阳子区(1987—)，男，博士，副研究员，研究方向为洁净煤燃烧技术。E-mail：ouyangziqu@iet.cn。
