煤基甲醇-直接还原铁联产系统的设计和分析

Design and analysis of coal based methanol-direct reduced iron (DRI) poly-generation system

以Shell粉煤气化为背景,以多联产能源梯级利用理论为基础,提出甲醇-直接还原铁串联生产工艺。借助化工流程模拟软件Aspen Plus对分产和联产系统进行模拟。通过能量衡算,计算出单产甲醇的能耗为39.7 GJ/t,直接还原铁的能耗为11.7 GJ/t。以相对节能率为评价准则,比较分产系统和联产系统的性能,发现联产系统相对节能率达到7.93%。又简单分析了联产和分产系统中能量的分布和转移,发现驰放气和尾气的利用是系统性能改善的主要原因。

A methanol-direct reduced iron（ DRI） poly-generation process is proposed,based on shell pulverized coal gasification and the principle of poly-generation cascaded utilization of energy. Aspen Plus software is used to simulate the separate production and co-generation process. For separate production system of methanol and iron,the methanol energy consumption is 39. 7 GJ / t and DRI energy consumption is 11. 7 GJ / t. With energy saving rate as an evaluation index,the performance of separate production system and the co-production system are compared. The results show that the relative energy saving rate of co-production system is 7. 93%. The distribution and transfer of energy in two systems are also analyzed. The ultilization of purge gas and tail gas is eventually found as the main cause for improvement of the performance.