反应气氛对煤热解过程中NH3释放的影响

为了实现煤的洁净转化 ,研究煤热解过程中 N转移的机理 ,实验在固定床反应器上采用程序升温法对碳含量不同的三种煤样进行了氩、甲烷、1 5 %水蒸气 /氩和 1 5 %水蒸气 /甲烷气氛下的煤加氢热解研究 ,主要对热解过程中产生的 NOx 主要前驱物 NH3 的释放规律及其影响因素进行了考察 .实验表明 ,由于水蒸气、甲烷提供了活性含 H集团 ,促进了热解过程中 NH3 的生成 ;另外 ,甲烷和水蒸气之间的协同作用 ,可以提供更多的活性含 H集团 .煤特性、反应温度和反应时间是影响 NH3 生成和半焦产率的主要因素 .

EFFECT OF REACTION GAS ON NH3 RELEASED DURING COAL PYROLYSIS

This paper mainly discusses the formation and release of NO x precursors-NH 3 during coal fixed-bed pyrolysis. Three coals with different carbon content were selected in our experiments. The reaction gases were Ar, CH 4, 15%H 2O/Ar and 15%H 2O/CH 4. The results indicate that the NH 3 yield is higher in the reaction gas of steam and CH 4 than that of only Ar or CH 4 and this increasing trend changes with coal types, final temperature and reaction time. The rease is CH 4 and H 2O is provided to activity H which high reactivity of H can promote the formation of NH 3 .The variety of char yield obtained after coal pyrolysis is not obvious in the optimal reaction conditions.