低热稳定性低阶煤在碎煤加压气化工艺中的应用

为提高低热稳定性低阶煤的碎煤加压气化效果,采用新疆、河南等地碎煤加压气化工艺,研究低阶煤热稳定性对碎煤加压气化效果的影响。结果表明:低热稳定性低阶煤的单台气化炉氧负荷仅达到设计的70%左右,比高热稳定性低阶煤低40%。煤的热稳定性越低,粗煤气中煤粉含量越高,影响煤气水分离、变换等后续工艺。最后提出可通过研究不同粒度煤的热稳定性、确定最小入炉煤粒度、测定碎煤加压气化煤粉的粒度、改进碎煤加压气化除尘系统、选择合理的气化压力、采用气化工艺组合等提高低热稳定性低阶煤碎煤加压气化效果。

Application of low thermal stability and low-rank coal in crushed coal pressurized gasification process

In order to improve the effects of low thermal stability and low-rank coal in crushed coal pressurized gasification, adopt the crushed coal pressurized gasification processes in Henan and Xinjiang Province,investigate the influence of thermal stability of low-rank coal on crushed coal pressurized gasification. The results show that single gasifier oxygen load can only reach about 70% of design load when use low stability and low-rank coal,about 40% less than the high stability and low-rank coal.Thermal stability of coal is lower and the higher dust content in raw gas affects the gas-water separation,it also influents the transform and follow-up processes.The effects of low thermal stability and low-rank coal in crushed coal pressurized gasification can be improved through investigating the thermal stability of different particle size of coal,determining minimum grain size of pulverized coal into the gasifier and the particle size of pulverized coal in the crushed coal pressurized gasification process,improving the dust removal system,selecting the reasonable gasification pressure,com-bining gasification process.