大同烟煤增压富氧燃烧过程中硫、氯和氟的析出特性  

Investigation on sulfur,chlorine and fluorine releasing characteristics during pressurized oxy-fuel combustion of Datong bituminous coal

作　　者：雷鸣[1] 吕凯文[1] 王春波[1] 阎维平[1] 王松岭[1] 

机构地区：[1]华北电力大学能源动力与机械工程学院,河北保定071003

出　　处：《燃料化学学报》2014年第9期1053-1059,共7页Journal of Fuel Chemistry and Technology

基　　金：国家高技术研究发展计划(863计划;2009AA05Z310);中央高校基本科研业务费专项资金(2014QN41)

摘　　要：利用高压热重结合傅里叶红外研究了大同烟煤在增压富氧燃烧过程中硫、氯和氟的释放行为,主要考察压力对其析出特性的影响。实验结果表明,压力的改变对煤中硫、氯和氟的迁移转化均有显著影响。随着压力的升高,黄铁矿硫向COS等中间产物的转化率逐渐增加,导致SO2的收率逐步上升,但在3 MPa时,燃煤SO2收率却有所降低。此外,压力升高后反应气氛中CO分压的增加促进了COS的生成,导致其收率逐渐上升。因为煤中有机氯析出和转化与挥发分的释放密切相关,所以高压下挥发分释放量的增加使得煤中有更多的有机氯析出并转化为HCl,而且压力升高后,挥发分燃烧速率和温度的升高促进了无机氟化物分解,HF生成量相应增加。此外,高压下水解反应的强化也提高了HF的收率。The release behavior of sulfur, chlorine and fluorine during pressurized oxy-fuel combustion was investigated by a pressurized thermogravimetric analyzer （ PTGA） combined with Fourier transform infrared （ FT-IR） spectroscopy, in which the influence of presus re on the rle ease cha racteristics was mailn y focused on.The results show that the changes in pressure have a remarkable effect on the mgi ration and transformation of sulfur, chlorine and fluorine.The conversion of pyrite to COS increases with the rise in pressure, which leads to an increase in SO2 yield, but at 3 MPa, the SO2 yield drops somewhat.Besides, the increase of CO partai l pressure at higher rp essure promotes the COS generatoi n, leading to an increase in COS yield.Beac use the release of chlorine is close reltae d to the volatile yield, thei ncrease of volait le yield at higher pressure makes more orgnai c chlorine release and conversion to HCl.Moreover, the ne hanec d burning rate and combustion tempre ature by volatiles at higher pressure accelerate the mineral fluorine resolving, and more HF is formed.Also, the hydrolytic reca tions are strengthened at higher pressure, which results in an incresa e of HF yield.

关 键 词：增压富氧燃烧 煤 硫 氯 氟 高压热重傅里叶红外联用 

分 类 号：TK123[动力工程及工程热物理—工程热物理]