基于等离子气化煤的化工动力系统优化

Optimization of Chemical Power System Based on Plasma Gasified Coals

化工工程通常具有较大的原料与动力消耗,而等离子气化煤耗水、耗电,亚临界火电机组又存在低负荷运行时热效率低的问题。利用Aspen Plus对化工系统与亚临界火电系统进行建模,然后对化工系统开展[火用]分析,据此建立了一种以等离子气化煤为核心的甲醇电联产系统,并以能量的梯级利用为指导对联产系统的参数与流程做了优化。结果表明:相比于单产工艺,联产后节水3.924 t/h,节煤3.19 t/h,汽轮机抽气量降低15.624 t/h,合成子系统的目的[火用]效率提高了近40%,等离子发生器的效率提高了1.69%,内部[火用]损失每小时减少1793 MJ。

Considering the fact that chemical engineering usually consumes too much raw materials and powers and the plasma coal gasification consumes water and power and the subcritical thermal power station has low thermal efficiency during low-load operation,making use of Aspen Plus to model both the chemical system and subcritical power station was implemented,including exergy analysis;based on this,a methanol-electricity co-generation system with plasma coal gasification was established and the cascade utilization was used as a guide to optimize both the parameter and process of the polyproduction system.The results show that,compared with the single-production process,after the co-generation,the water saving can stand at 3.924 t/h along with a coal-saving of 3.19 t/h and turbine extraction volume reduced by 15.624 t/h;the synthesis subsystem’s exergy efficiency can be increased by nearly 40%and the loss of the plasma generator reduced by nearly 1.69%as well as the internal loss reduced by 1793 MJ/h.