煤热解过程中氮分配规律的试验研究

TEST STUDY ON NITROGEN DISTRIBUTION PATTERN DURING THE COAL PYROLYSIS PROCESS

利用热重分析仪对煤的热解过程进行试验研究,考察不同终止温度和试样粒径对烟煤或无烟煤中挥发分氮和焦炭氮转化率的影响。结果发现:碳化程度深的煤热解时,氮更多地保留在煤焦中,反之氮更容易随挥发分析出,形成气态含氮产物;高温有利于氮从煤焦中析出;煤的粒径对挥发分氮析出作用明显,煤粉越细,挥发分氮转化率越高。

Test study on the coal pyrolysis process has been carried out by using thermogravimetric analyser. The influence of different terminated temperature and particle size of the coal sample upon conversion rate of volatile nirrogen and coke nitrogen in bituminous coal or hard coal has been investigated. It is found from the results that the more nitrogen retention existing in the chars when pyrolysis of deeply carbonized coal; on the contrary, the nitrogen is more easily to separate out along with volatile, forming gaseous nitrogen contained products; high temperature is helpful for nitrogen to be separated out from the chars, and the particle size of coal has obvious effect for volatile nitrogen to separate out. The more finely pulverized coal has more higher conversion rate of volatile nitrogen.