气体停留时间对煤温和气化的影响

在鼓泡流化床反应器中进行了神木煤添加ＣａＯ的煤温和气化研究。在常压、７５０℃，高纯氮载气及反应器内停留时间８．５ｓ～３４ｓ范围内，总挥发分产率随停留时间增加而增加。本试验条件下，停留时间８．５ｓ时，焦油产率出现最大值，达４．５４％（质量分数），至１８．２ｓ时，下降为约１％，下降了７８％。随气体停留时间的增加，气态产率的提高和液态产率的减少与半焦中残留挥发分的降低呈对应关系。通过适当降低载气流量，控制气体停留时间，可以更合理地分配煤中有机质

Effect of Gas Residence Time on Coal Mild Gasification

The mild gasification of Shenmu coal is investigated in an experimental fluidized bed reactor.At the atmospheric pressure and 750 the total volatile yield of products increases with the gas residence time()in the range of 85s34s.When is 85s,the tar yield has a maximum of 454% then the tar yield decreased to 1% when the gas residence time is 182s.We also found that the increase of yields of gaseous products and the decrease of tar is ralated to the volitile matter of char.On the basis of above results,we can utilize reasonably distribute the organic parts of coal by means of adjusting carrier gas flow and controlling gas residence time .