Effect of Combustion Parameters on the Emission and Chemical Composition of Particulate Matter during Coal Combustion
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- 作者：Xiaowei Liu ; Minghou Xu ; Hong Yao ; Dunxi Yu ; Xiangpeng Gao ; Qian Cao ; Youmin Cai
- 刊名：Energy & Fuels
- 出版年：2007
- 出版时间：January 2007
- 年：2007
- 卷：21
- 期：1
- 页码：157 - 162
- 全文大小：376K
- 年卷期：v.21,no.1(January 2007)
- ISSN：1520-5029
文摘
Combustion of coal was studied in a drop tube furnace to understand particulate matter (PM10) emissionand its characteristics. Experimental conditions were selected as follows: The coal particle size was dividedinto three sizes, 100-200 
m, 63-100 m, and smaller than 63 m. The reaction temperature was 1423,1523, and 1673 K, respectively. The oxygen content was 20% and 50%, respectively. PM10 was collectedwith a 13 stage low-pressure impactor (LPI) having an aerodynamic cutoff diameter ranging from 10.0 to0.03 m for a size-segregated collection. The properties of the PM including its concentration, particle sizedistribution, and elemental composition were investigated. The experimental results indicate that the emittedPM10 has a bimodal distribution with two peaks around 4.0 and 0.1 m. The reaction temperature, coal particlesize, and oxygen content affect PM10 emission significantly. Increasing the temperature and oxygen contentand decreasing the coal particle size lead to the formation of more PM10, respectively. Distributions of individualelements within PM10 are different. The majority of Si, Al, and Fe exist in PM1-10. Na, K, and Ca have abimodal distribution. S and P have a single mode distribution, which are prevalent in PM1. With considerationof experiment results and thermodynamic calculation, the chemical species within PM1 are rich in sulfates;meanwhile, the chemical species within PM1-10 are mainly aluminosilicate and quartz. The elementalcompositions are greatly affected by increasing the oxygen content from 20% to 50%. Between PM1 andPM1-10, a varied oxygen content has more influence on PM1 than PM1-10. For PM1, elemental sulfur is greatlydecreased with the increase of oxygen content. In contrast, elemental iron, silicon, and aluminum are greatlyincreased, the extent of elemental silicon increased being the most. However, the change of oxygen has nosignificant effect on the elemental mass content of PM1-10.
m, 63-100 m, and smaller than 63 m. The reaction temperature was 1423,1523, and 1673 K, respectively. The oxygen content was 20% and 50%, respectively. PM10 was collectedwith a 13 stage low-pressure impactor (LPI) having an aerodynamic cutoff diameter ranging from 10.0 to0.03 m for a size-segregated collection. The properties of the PM including its concentration, particle sizedistribution, and elemental composition were investigated. The experimental results indicate that the emittedPM10 has a bimodal distribution with two peaks around 4.0 and 0.1 m. The reaction temperature, coal particlesize, and oxygen content affect PM10 emission significantly. Increasing the temperature and oxygen contentand decreasing the coal particle size lead to the formation of more PM10, respectively. Distributions of individualelements within PM10 are different. The majority of Si, Al, and Fe exist in PM1-10. Na, K, and Ca have abimodal distribution. S and P have a single mode distribution, which are prevalent in PM1. With considerationof experiment results and thermodynamic calculation, the chemical species within PM1 are rich in sulfates;meanwhile, the chemical species within PM1-10 are mainly aluminosilicate and quartz. The elementalcompositions are greatly affected by increasing the oxygen content from 20% to 50%. Between PM1 andPM1-10, a varied oxygen content has more influence on PM1 than PM1-10. For PM1, elemental sulfur is greatlydecreased with the increase of oxygen content. In contrast, elemental iron, silicon, and aluminum are greatlyincreased, the extent of elemental silicon increased being the most. However, the change of oxygen has nosignificant effect on the elemental mass content of PM1-10.