Effect of the anthracite ratio of blended coals on the combustion and NOx emission characteristics of a retrofitted down-fired 660-MWe utility boiler

被引：67

作者：

Liu, Guangkui ^{[1
]}

Li, Zhengqi ^{[1
]}

Chen, Zhichao ^{[1
]}

Zhu, Xingying ^{[1
]}

Zhu, Qunyi ^{[1
]}

机构：

[1] Harbin Inst Technol, Sch Energy Sci & Engn, Harbin 150001, Peoples R China

来源：

APPLIED ENERGY | 2012年 / 95卷

基金：

中国国家自然科学基金;

关键词：

Arch-fired boiler; Retrofit; Blended coals; NOx emissions; Boiler efficiency; SECONDARY AIR;

D O I：

10.1016/j.apenergy.2012.02.031

中图分类号：

TE [石油、天然气工业]; TK [能源与动力工程];

学科分类号：

080707 [能源环境工程]; 082001 [油气井工程];

摘要：

Industrial experiments were performed for a retrofitted 660-MWe full-scale arch-fired boiler. The ignition position of the primary air/fuel mixture flow, furnace temperature and flue gas component after the air heater were measured with different anthracite ratios at loads of 660- and 380-MWe. As the ratio of anthracite increased, the gas temperature decreased in the fuel-burning zones of the C4 and C6 burners, indicating a farther ignition position of the primary fuel/air flow under the arches, the gas temperature of the lower furnace decreased while that of the upper furnace increased, NOx emissions decreased while both the exhaust gas temperature and carbon content in fly ash increased, and the boiler efficiency decreased. At the rated load, an anthracite ratio of 35% was optimal for economical efficiency. At low load, the negative gas pressure fluctuated remarkably, which led to unstable combustion in the furnace. To ensure safe and stable operation of the boiler, a mass ratio of anthracite of 25% is advisable. Crown Copyright (C) 2012 Published by Elsevier Ltd. All rights reserved.

引用

页码：196 / 201

页数：6

共 24 条

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