Comparisons of pulverized coal combustion in air and in mixtures of O2/CO2

被引：290

作者：

Liu, H ^{[1
]}

Zailani, R ^{[1
]}

Gibbs, BM ^{[1
]}

机构：

[1] Univ Leeds, Energy & Resources Res Inst, Sch Proc Environm & Mat Engn, Leeds LS2 9JT, W Yorkshire, England

来源：

FUEL | 2005年 / 84卷 / 7-8期

关键词：

pulverized coal combustion; five gas recycling; coal combustion in HO2/CO2; NOx emissions;

D O I：

10.1016/j.fuel.2004.11.018

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：

0807 [动力工程及工程热物理]; 0820 [石油与天然气工程];

摘要：

Pulverized coal combustion in air and the mixtures of O-2/CO2 has been experimentally investigated in a 20 kW down-fired combustor (190 mm id X 3 m). Detailed comparisons of gas temperature profiles, gas composition profiles, char burnouts, conversions of coal-N to NOx and coal-S to SO2 and CO emissions have been made between coal combustion in air and coal combustion in various O-2/CO2 mixtures. The effectiveness of air/oxidant staging on reducing NOx emissions has also been investigated for coal combustion in air and O-2/CO2 mixtures. The results show that simply replacing the N-2 in the combustion air with CO2 will result in a significant decrease of combustion gas temperatures. However, coal combustion in 30% O-2/70% CO2 can produce matching gas temperature profiles to those of coal combustion in air while having a lower coal-N to NOx conversion, a better char burnout and a lower CO emission. The results also confirm that air/oxidant staging is very effective in reducing NOx emissions for coal combustion in both air and a 30% O-2/70% CO2 mixture. SO2 emissions are proved to be almost independent of the combustion media investigated. (c) 2004 Elsevier Ltd. All rights reserved.

引用

页码：833 / 840

页数：8

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