流化床O2/CO2气氛下添加石灰石对燃煤PM2.5的控制

屈成锐; 徐斌; 吴健; 刘建新; 王学涛

流化床O₂/CO₂气氛下添加石灰石对燃煤PM_2.5的控制

河南科技大学车辆与动力工程学院, 河南洛阳 471003

基金项目: 国家自然科学基金(50806020); 河南省教育厅科学技术研究重点项目(13A470238).

详细信息

通讯作者:
屈成锐

中图分类号: TK16
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出版历程
- 收稿日期: 2013-03-11
- 修回日期: 2013-05-29
- 刊出日期: 2013-08-30

Effect of limestone addition on PM_2.5 formation during fluidized bed coal combustion under O₂/CO₂ atmosphere

College of Vehicle & Motive Power Engineering, Henan University of Science and Technology, Luoyang 471003, China

摘要

摘要: 采用小型流化床研究了在O₂/CO₂气氛下添加石灰石对PM_2.5(空气动力学直径小于2.5 μm的颗粒物)的控制.实验采用荷电低压撞击器(ELPI)采集和分析燃烧后的PM_2.5.结果表明,添加石灰石是燃烧过程中影响PM_2.5生成的重要因素.添加石灰石后,生成PM_1.0的数量浓度均降低,而PM_1.0~2.5的数量浓度均略有增加;PM_2.5质量粒径分布均呈双峰分布,峰值分别出现在0.2和2.0 μm左右.随着Ca/S物质的量比的增加,PM_2.5中Si、Na、K、S和Cu的含量呈减少的趋势;随着颗粒粒径的减小,S、Cu、K和Na的含量有增大的趋势,而Si的含量有减少的趋势.
- O₂/CO₂ /
- 煤燃烧 /
- PM_2.5 /
- 流化床 /
- 石灰石
Abstract: The effect of limestone addition on the emission characteristics of PM_2.5 (particulates with aerodynamic diameter less than 2.5 μm) was studied in a fluidized bed combustor. The combustion tests were carried out at 1 123 K under O₂/CO₂ atmosphere. The PM_2.5 generated from coal combustion was collected and analyzed with an Electrical Low Pressure Impactor (ELPI). The results indicate that limestone has a great effect on the formation of PM_2.5 during coal combustion under O₂/CO₂ atmosphere. The concentration of PM_1.0 is diminished; but the concentration of PM_1.0~2.5 is enhanced slightly with the addition of limestone. The mass size distribution of PM_2.5 is similar, which displays two peaks around 0.2 and 2.0 μm, respectively. As the molar ratio of Ca/S increases, the concentrations of Si, Na, K, S, and Cu decrease. As the particle size decreases, the concentrations of S, Cu, K, and Na increase, but the concentrations of Si decrease.
- O₂/CO₂ /
- coal combustion /
- PM_2.5 /
- fluidized bed /
- limestone

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