甲醇/电联产系统中甲醇合成与精馏模拟及变负荷研究

A Study of Methanol Synthesis,Distillation Simulation and Load Variation of a Methanol/Power Cogeneration System

整体煤气化联合循环(IGCC)作为最有前景的清洁煤发电技术之一,将IGCC系统与甲醇合成系统耦合,不仅可以提高系统的负荷调节能力,同时也能改善IGCC电站的经济性。通过ASPEN建立了C301型低压列管式气相甲醇合成和三塔精馏的流程模拟,提出了基于分流比与循环比的变负荷调节策略,借助四象限图,展示了在不同的分流比与循环比的情况下,甲醇变工况范围和电力负荷的调节能力,并通过改变精馏各塔的再沸与冷凝负荷实现了精馏过程的变负荷调节。

As one of the most promising clean-coal-fired power generation technologies,an integrated gasification combined cycle (IGCC) system coupled with a methanol synthesis system not only can enhance the load regulating ability of the system but also simultaneously improve the cost-effectiveness of the IGCC power plants. The flow path in the process of C301 type LP tube row gas-phase methanol synthesis and three-tower distillation was simulated through the use of software ASPEN,and a tactic for load-variation regulation based on the divided flow ratio and circulation ratio has been proposed. With the help of a four-quadrant chart,the methanol load variation range and the ability of regulating power loads under the condition of different divided flow ratios and circulating ratios were shown. In addition,a load variation regulation of distillation processes was accomplished through a change of the reboiling and condensing loads of various distillation towers.