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Effect of SO2 Addition on PM Formation from Biomass Combustion in an Entrained Flow Reactor
Energy & Fuels ( IF 5.3 ) Pub Date : 2018-09-24 00:00:00 , DOI: 10.1021/acs.energyfuels.8b02831
Zhongfa Hu 1 , Xuebin Wang 1 , Renhui Ruan 1 , Shuaishuai Li 1 , Shengjie Bai 1 , Jiaye Zhang 1 , Houzhang Tan 1
Affiliation  

The sulfation process during biomass combustion and cofiring, by converting KCl into K2SO4, can affect particulate matter (PM) formation, ash deposition, and corrosion in a furnace. In this study, the effects of temperature, SO2 concentration, O2 concentration, and oxy-combustion atmosphere on the sulfation and PM formation were investigated in an entrained flow reactor. Results show that the particle size distribution (PSD) of PM10 from biomass combustion is bimodal and that PM10 is dominated by PM1.0 consisting of KCl and K2SO4. Enhanced sulfation by SO2 addition generally increases the particle size of PM1.0 and the K2SO4 content in PM1.0, but its effect on PM1.0–10 is marginal. The effect of sulfation on PM1.0 formation strongly depends on the temperature: at high temperature (e.g., 1300 °C), sulfation is not favorable, thereby having negligible influence on PM1.0 formation; while at moderate temperature (e.g., 1100 °C), sulfation is significantly promoted, resulting in a larger size and higher yield of PM1.0. With the increase of the SO2 and O2 concentration, the particle size and the sulfur content in PM1.0 increase, indicating an enhanced sulfation process. When the combustion atmosphere switches from O2/N2 to O2/CO2, the PM1.0 emission increases, while the sulfation process is inhibited. The comparison between the nucleation-growth modeling of KCl(g) and K2SO4(g) shows that the presence of K2SO4(g) advances homogeneous nucleation, resulting in a longer residence time for particle growth and therefore a larger PM1.0 size.

中文翻译:

SO 2对气流床中生物质燃烧PM形成的影响

通过将KCl转化为K 2 SO 4,生物质燃烧和共烧过程中的硫酸化过程会影响颗粒物(PM)的形成,灰分沉积和熔炉中的腐蚀。在这项研究中,研究了在气流床反应器中温度,SO 2浓度,O 2浓度和氧燃烧气氛对硫酸化和PM形成的影响。结果表明,来自生物质燃烧的PM 10的粒径分布(PSD)是双峰的,并且PM 10以由KCl和K 2 SO 4组成的PM 1.0为主。SO 2增强的硫酸化作用此外通常增加PM的粒径1.0和K个2 SO 4中的PM含量1.0,但其对PM效果1.0-10是微不足道的。硫酸盐对PM 1.0形成的影响很大程度上取决于温度:在高温(例如1300°C)下,硫酸盐化是不利的,因此对PM 1.0形成的影响可忽略不计。而在中等温度下(例如1100°C),硫酸盐被明显促进,从而导致更大的尺寸和更高的PM 1.0收率。随着SO 2和O 2浓度的增加,PM 1.0中的粒径和硫含量增加,表明硫酸盐化过程增强。当燃烧气氛从O 2 / N 2变为O 2 / CO 2时,PM 1.0的排放增加,而硫酸化过程受到抑制。氯化钾(g)和K的核-生长建模之间的比较2 SO 4(g)表示的是K的存在2 SO 4(克)前进均相成核,从而导致更长的停留时间为颗粒生长,并且因此一个大的PM 1.0尺寸。
更新日期:2018-09-24
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