油页岩与半焦混合气化发电系统模拟分析

基于Aspen Plus平台,对气体热载体工艺中不能利用的小颗粒油页岩与半焦混合气化发电过程进行模拟;并对模拟结果进行能量平衡和平衡计算,考察了空气当量比、汽固比和气化剂对气化性能和系统效率的影响。结果表明,使用空气作为气化剂时,设置空气当量比为0.302,汽固比为0.006 7,可以达到最佳的气化效果,所生成的合成气低位热值为6.12 MJ/Nm~3,冷气化效率为66.13%,此时系统的一次能源利用效率达到39.02%,效率也达到42.64%;另外,当使用氧气作为气化剂时,虽然冷气化效率有所提高,但系统总率会有一定程度降低。

Process Simulation and Analysis of an oil shale-semi-coke co-gasification power generation system

In this paper, an oil shale-semi-coke co-gasification power generation system is constructed. The system is simulated with Aspen Plus, energy balance and exergy balance are calculated with the simulation data, and a sensitivity analysis with equivalence ratio, vapor-solid (the mixture of oil shale and semi-coke) ratio and gasifying agent types is performed. The following conclusions are derived from the analysis results: When the air is used as a gasifying agent, the equivalence ratio is 0.302 and the vapor-solid ratio reaches 0.0067, the best effect of gasification can be achieved; the LHV of Syngas is 6.12 MJ/Nm3 and the cold gasification efficiency is 66.13%. At the same time, the energy efficiency and the exergy efficiency of the system can reach 39.02% and 42.64% respectively. Besides, when gasifying agent is pure oxygen, although the cold gasification efficiency can be increased, but the total exergy efficiency of the system will be reduced.