弱粘煤和不粘煤的快速热解及其团聚研究

Research on Flash Pyrolysis and Agglomeration of Slightly Caking and Non-Caking Coals

对弱粘煤和不粘煤的快速加氢热解及在快速热解情况下发生的团聚现象进行了研究.研究发现,在高温加压快速加热条件下,氢气气氛中,煤的热失重率比煤的挥发分高,而在氮气气氛中,煤的热失重率低于煤的挥发分.同时,在高温加压快速加热条件下,在氮气气氛中的热失重率远低于氢气气氛中的热失重率.大多数弱粘煤和不粘煤,在高温下快速热解,无论在氢气气氛还是在氮气气氛中都发生团聚现象,即煤热解残炭团聚为圆柱状,且有一定的强度.有些煤(如Strongman煤和兴隆煤)在氢气气氛中残炭强度大于氮气气氛中的残炭强度.

Flash pyrolysis and agglomeration of slightly caking and non-caking coals were studied. Under high pressure conditions, weight loss of coal during pyrolysis in different gas at different gas residence time was studied at first. Compared with the volatile matter of coal, the rate of weight loss is higher in hydrogen at a short gas residence time, but lower in nitrogen at a long gas residence time. The rate of weight loss during pyrolysis in nitrogen is less than that in hydrogen at a short gas residence time. The agglomeration of slightly caking or non-caking coal during rapid pyrolysis was investigated. When slightly caking or non-caking coals were treated at high pressure and rapid heating rate, char from these coals formed into the cylinder and did not fall to pieces. The force strength of char from some coals (Strongman coal, Xinglong coal) treated in hydrogen is higher than that in nitrogen.