Role of exhaust gas recycle on submicrometer particle formation during oxy-coal combustion

被引：15

作者：

Wang, Xiaofei ^{[1
]}

Daukoru, S. Michael ^{[1
]}

Torkamani, Sarah ^{[1
]}

Wang, Wei-Ning ^{[1
]}

Biswas, Pratim ^{[1
]}

机构：

[1] Washington Univ, Aerosol & Air Qual Res Lab, Dept Energy Environm & Chem Engn, St Louis, MO 63130 USA

来源：

PROCEEDINGS OF THE COMBUSTION INSTITUTE | 2013年 / 34卷

关键词：

Oxy-coal combustion; Aerosol; Drop-tube furnace; Water vapor; STAGNANT BOUNDARY-LAYER; O-2/RECYCLED FLUE-GAS; ASH FORMATION; POWER-GENERATION; CARBON PARTICLE; FINE; REDUCTION; DIFFUSION; ULTRAFINE; CAPTURE;

D O I：

10.1016/j.proci.2012.07.049

中图分类号：

O414.1 [热力学];

学科分类号：

摘要：

During oxy-coal combustion, recycled exhaust gas is used as a diluent to replace nitrogen in pulverized coal-fired boilers to moderate boiler temperatures. The effect of recycle (upto recycle ratios of 60%) on combustion of Powder River Basin (PRB) coal related submicrometer particle formation was investigated in a drop-tube furnace system. The recycled exhaust gas containing lower O-2 concentration and higher CO2 concentration suppressed submicrometer particle formation. However, it was found that water vapor in recycled exhaust gas greatly enhanced the formation of submicrometer particles. The gas composition changes that result with exhaust-gas recycle significantly affected the size distribution of submicrometer particles at the exit of the combustor. Differences in the particle size distribution with and without filtration of recycled exhaust gas was insignificant. The composition of the resultant particles in oxy-coal combustion and conventional coal-air combustion as determined by X-ray diffraction was similar. (C) 2012 The Combustion Institute. Published by Elsevier Inc. All rights reserved.

引用

页码：3479 / 3487

页数：9

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