摘要
利用一个内径４８ｍｍ，具有锥形分布板的流化床对神木煤（４５～８０目）的热解行为进行了研究。流化床稀浓两段温度可以分别控制。浓相段温度４００～９００℃，稀相段温度控制在５８０℃，得到了浓相段温度与热解产物产率的关系。结果表明，提高浓相段温度有利于Ｈ２，ＣＯ，ＣＨ４及Ｃ２Ｈ４产率的提高，浓相段温度在６００～６５０℃左右液相产品产率达到最大值。通过与以往的研究者所得结果的比较，表明在稀相段温度较高的情况下，即使挥发分停留时间很短，也会有相当程度的二次反应发生。而本文的结果是在最大限度地减小了稀相段气相二次反应的情况下得到的，更准确地反映了流化床浓相温度对热解的影响。
Shenmu coal (45+80 mesh) was pyrolyzed in a specially designed fluidized bed reactor with an ID of 48mm and a coneshaped distributor The temperature of the dense phase and the freeboard can be controlled individually The relationship between the gas phase product yield and the dense phase temperature was obtained The results show that the yields of H2, CO, CH4 and C2H4 increase dramatically with increasing dense phase temperature, however the liquid yield reaches the maximum at the dense phase temperature of 600￣650℃ By comparing with the results of former researchers, it can be seen that the volatile can undergo significant secondary reactions when the freeboard temperature is high, even at a very short residence time The results of this paper are believed to represent the more accurate trend of the effect of bed temperature on gas phase product yield because the secondary reactions in the vapour phase were minimized in this experiment
出处
《燃料化学学报》
EI
CAS
CSCD
北大核心
1998年第3期238-242,共5页
Journal of Fuel Chemistry and Technology
关键词
煤
流化床
热解
浓相温度
coal
fluidized bed
rapid pyrolysis
dense phase temperature
gas yield
