LIU Wen1,2，OUYANG Ziqu2，CAO Xiaoyang2，NA Yongjie1,2
(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: Pulverized coal preheating combustion was on a 30 kW pulverized coal flameless combustion test rig to explore the feasible of solid fuel, and the characteristics of combustion and NOx emissions. It is shown that stable flameless combustion for Shenmu bitumite with high volatile matter and coal gasification fly ash with low volatile matter can be achieved in the test rig. During the preheating process, a part of volatile matter is released and a part of char is gasified, and then high temperature preheated fuel (gas and char) enter into a down-fired combustor through a fuel nozzle forming staged combustion. It decrease effectively the temperature peak and make the temperature profile more uniform. Fluctuation of the combustion temperature in the down-fired combustor is less than 10%. NOx was mainly derived from char-N and is released with the combustion of char. NOx emission is 90.4 mg/m3 and 96.7mg/m3 (@ 6% O2) for Shenmu bitumite and coal gasification fly ash, respectively.
Keywords: nitrogen oxides; preheat; flameless combustion; coal gasification fly ash
中图分类号：TK16 文献标志码：A
文章编号：1008-5548(2019)04-0001-11
DOI:10.13732/j.issn.1008-5548.2019.04.001
收稿日期： 2019-02-20，修回日期：2019-02-27，在线出版时间：2019-04-29 09:18。
基金项目：国家重点研发计划项目，编号：2017YFB0602003。
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。
