CAJ | 학술논문

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S O2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H Cl，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。
이용고압열중결합부리협홍외연구료대동연매재증압부양연소과정중류、록화불적석방행위，주요고찰압력대기석출특성적영향。실험결과표명，압력적개변대매중류、록화불적천이전화균유현저영향。수착압력적승고，황철광류향COS등중간산물적전화솔축점증가，도치SO2적수솔축보상승，단재3 MPa시，연매S O2수솔각유소강저。차외，압력승고후반응기분중CO분압적증가촉진료COS적생성，도치기수솔축점상승。인위매중유궤록석출화전화여휘발분적석방밀절상관，소이고압하휘발분석방량적증가사득매중유경다적유궤록석출병전화위H Cl，이차압력승고후，휘발분연소속솔화온도적승고촉진료무궤불화물분해，HF생성량상응증가。차외，고압하수해반응적강화야제고료HF적수솔。
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.