Effects of High-temperature Char Layer and Pyrolysis Gas on NO_x Reduction in a Typical Decoupling Combustion Coal-fired Stove
Effects of High-temperature Char Layer and Pyrolysis Gas on NO_x Reduction in a Typical Decoupling Combustion Coal-fired Stove
复制标题
典型解耦燃烧燃煤炉中高温炭层和热解气对NOx还原的影响
DOI：
10.1007/s11630-018-1022-3
复制
发表时间：
2019
影响因子：
2.5
通讯作者：
Du Wei
中科院分区：
文献类型：
--
作者：
Li Honglin;Han Jian;Zhang Nan;Liu Xinhua;He Jingdong;Du Wei
由于技术条件和经济成本的限制，抑制氮氧化物（NO_x）是降低国产燃煤炉污染物排放的关键。中国科学院过程工程研究所（IPE）发明的解耦燃烧（DC）技术，其特点是将传统炉膛分离为热解和燃烧室，并在两者之间设置底部通道。在本研究中，对典型解耦炉中烟煤型煤在不同运行模式下的燃烧进行了测试和模拟，以验证直流技术相对于所谓的反燃烧的优势。利用热解室内低温还原气氛下的低NO_x燃烧，以及燃烧室高温氧化气氛下的焦炭和热解气的后燃，可以实现低NO_x和CO排放的沥青型煤无烟高效燃烧。本文通过数值模拟研究了热解气体中主要还原性组分以及炭对NO_x还原的影响，结果表明，CH_4、CO对炭的还原能力逐渐增强，但不能通过简单的相加来确定它们的综合还原能力。
The suppression of nitrogen oxides (NO_x) is the key to reducing pollutant emission of a domestic coal-fired stove due to the limitation of technology condition and economic cost.The decoupling combustion (DC) technology invented by Institute of Process Engineering (IPE),Chinese Academy of Sciences (CAS) is characterized by that a traditional stove is separated into a pyrolysis and a combustion chamber as well as a bottom passage between them.In this study,the combustion of briquette from bituminous coal in different operation modes in a typical decoupling stove is tested and simulated to validate the advantage of DC technology over so-called reverse combustion.The smokeless and high-efficiency combustion of bituminous briquette with low emissions of NO_x and CO can be implemented by utilizing low NO_x combustion under low temperature and reduction atmosphere in the pyrolysis chamber as well as after-combustion of char and pyrolysis gas under high temperature and oxidation atmosphere in the combustion chamber.The effects of the main reducing components in pyrolysis gas as well as char on NO_x reduction were numerically investigated in this study,which shows that the reducing ability increases gradually from CH_4,CO to char,but the combined reducing ability of them cannot be determined by a simple addition.