N2气氛下温度和压力对煤热解的影响

Study of the effects of temperature and pressure on the coal pyrolysis in the atmosphere of N2

研究煤热解的反应特性有助于提高煤热解的转化率和焦油收率并且能够改善焦油的品质。本文在固定床反应器上研究了N2气氛中,不同压力和温度下的唐山烟煤热解反应,考察了温度和压力对热解失重率、热解气体组成及液相产物产率的影响规律。结果表明当热解压力由1MPa增加至3MPa时,唐山烟煤的失重率和焦油产率均先增加后降低,在2MPa时达到最大值。当温度低于600℃时,压力不影响CH4、H2和CO的收率,当温度超过600℃时,CH4、H2和CO的收率随热解压力的升高而降低。随着热解温度的升高,煤热解的失重率、水的产率以及CH4、H2的收率不断增大,焦油的收率和CO的收率先增大后降低,在2MPa下600℃时焦油的收率达最大值为9.23%。

The study of the reaction characteristics of coal pyrolysis is helpful to improve the conversion of coal pyrolysis and the yield of tar,as well as the quality of tar.In this paper,the pyrolysis behavior in N2 atmosphere of coal under different pressure and temperature was investigated in a fixed pyrolysis reactor.Moreover,the effects of temperature and pressure on weight loss rate of pyrolysis,pyrolysis gas composition and liquid product yield were also investigated.The results showed that the weight loss rate and the tar yield of the coal decreased at first and then increased when the pressure increased from 1 MPa to 3 MPa,and the peak was reached at 2 MPa.When the temperature was below 600°C,the pressure made no difference on the yield of CH4,H2 and CO.However,the increasing temperature was up to 600°C or more,the yield of water,CH4 and H2,as well as the weight loss rate of coal pyrolysis,were both increased.Meanwhile,The yield of tar and CO increased at first and then decreased,Futhermore,the maximum yield of tar reached 9.23%at 2MPa and 600°C.