Analysis of the behaviour of pollutant gas emissions during wheat straw/coal cofiring by TGFTIR
Analysis of the behaviour of pollutant gas emissions during wheat straw/coal cofiring by TGFTIR
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DOI：
10.1016/j.fuproc.2010.12.029
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发表时间：
2011-05
期刊：
影响因子：
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通讯作者：
Cuiping Wang;Yajue Wu;Qing-huo Liu;Hairui Yang;Fengyin Wang
中科院分区：
文献类型：
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作者：
Cuiping Wang;Yajue Wu;Qing-huo Liu;Hairui Yang;Fengyin Wang
采用热重分析法（TGA）对麦草与煤混烧过程中污染气体的排放行为进行了实验研究。本研究选取了我国中部地区典型的无烟煤和小麦秸秆为研究对象。煤与麦草的质量比分别为10：90、15：85、40：60和60：40，采用含氧气和氮气的模拟空气进行燃烧。采用傅里叶变换红外光谱（FTIR）联用技术，研究了HCl、SO2、CO2和NOx等气体污染物的排放特性。结果表明，HCl、SO2、CO2和NOx的排放量与挥发分燃烧和焦炭反应阶段密切相关。HCl的释放主要是在220 ~ 450°C的挥发份燃烧过程中释放的。HCl对温度的曲线显示出单峰，并且无论比例如何，所有共混物的HCl峰都出现在310°C。SO_2和NOx的排放曲线随温度的变化具有双峰特征。对于所有共混物，第一个峰出现在320°C附近，然而，随着共混物中煤含量的增加，第二个峰向更高的温度偏移。研究表明，秸秆和煤的结合可以通过降低峰值释放的幅度来产生更好的排放控制。分析表明，以质量分数为40%的煤和60%的秸秆为原料的混合样品产生的HCl、NOx和SO2气体排放量最低。CO2排放主要产生于煤焦燃烧阶段，且随掺碳量的增加而增加。
The behaviour of pollutant gas emissions during the firing of wheat straw and coal blends was examined experimentally by using thermogravimetric analysis (TGA). Typical anthracite coal and wheat straw in central China were selected in this study. The ratio of coal to wheat straw by mass was set as 10:90, 15:85, 40:60 and 60:40 and the firing was carried using simulated air with oxygen and nitrogen gases. The emission characteristics of gas pollutants such as HCl, SO2, CO2and NOxwere determined by coupled Fourier transform infrared (FTIR) measurements. The results showed that HCl, SO2, CO2and NOxemissions were closely related to the volatile combustion and char reacting stages. HCl emission was mainly released during the volatile combustion at the temperature between 220 and 450°C. The profiles of HCl against temperature exhibit a single-peak, and the HCl peak occurred at 310°C for all blends no matter what the ratio. The emission profiles of SO2, and NOxagainst temperature had the characteristic of two peaks. The first peak occurred around 320°C for all blends, and however the second peak shifted towards higher temperatures as the coal content was increased in the blends. The study showed that combining the straw and coal can produce better emission control by reducing the magnitude of the peak releases. The analysis showed that the blended sample with 40% coal and 60% straw by mass produced the lowest levels of HCl, NOxand SO2gas emissions. The CO2emission was mainly produced in the char combustion stage and purely increased with the carbon content in the blends.