煤与天然气气流床共气化制合成气试验研究

为提高煤、天然气资源综合利用效率,优化合成气成分,进行了煤与天然气气流床共气化技术研究。介绍了煤与天然气气流床共气化的试验装置及工艺流程,考察了气化温度、压力、水煤浆浓度、CH4与煤比对共气化反应的影响。结果表明,气化温度和CH4与煤比是共气化反应的主要影响因素,较高的气化温度对共气化反应有利,气化温度为1 350℃时,共气化指标较好,有效气体积分数大于90%;随着CH4与煤比的增大,合成气n(H2)/n(CO)增高。CH4与煤比为0.9 m3/kg时,合成气中n(H2)/n(CO)约1.2。根据后续合成工艺要求,通过调节气化温度和CH4与煤比,可获得n(H2)/n(CO)在0.8~2.0的合成气。

Experimental Study on Syngas Production from Entrained-flow Co-gasification of Coal and Natural Gas

In order to improve the utilization efficiency of coal & natural gas and optimize the composition of syngas, the technology of entrained-flow co-gasification for coal & natural gas was studied. The test equipment and process flow were introduced, the impact of gasification temperature, pressure, CWS concentration and V(CH4)/m(coal) on the co-gasification were investigated. The results showed that gasification temperature and V(CH4)/m(coal) were the main influential factors on co-gasification. Higher gasification temperature was beneficial to co-gasification reaction. When the gasification temperature was 1 350 ℃, the volume content of effective syngas was greater than 90%. The n(H2)/n(CO) in syngas was about 1.2 when V(CH4)/m(coal) was 0.9 m3/kg, and the n(H2)/n(CO) increased with the increase of V(CH4)/m(coal). The n(H2)/n(CO) in syngas could be adjusted from 0.8 to 2.0 by changing the gasification temperature and V(CH4)/m(coal) to meet the requirements of downstream synthesis process.