生物质基甲醇动力多联产系统分析

EXERGY ANALYSIS ON BIOMASS BASED METHANOL & POWER POLYGENERATION SYSTEM

本文提出一个基于生物质气化的甲醇-动力多联产系统.该系统突出特色在于取消了变换过程,取消重整过程,并且适度循环未反应合成气,通过耦合化工与动力过程实现化学能的组分对口、分级转化以及物理能梯级利用原则.通过对系统分析炯结果表明,该系统与分产系统(独立甲醇生产系统,生物质气化联合循环)相比,节能高达10个百分点,该系统为生物质未来应用提供一个新的途径.

A new kind of biomass based polygeneration system for the production of power and methanol is proposed in this paper. The most attractive feature of this proposed system is the elimination of shift reaction and the adoption of partial-recycle of unreacted syngas. The thermodynamic performance of the system was examined and compared to those of two biomass-based reference individual systems： the individual biomass to methanol system with shift process and biomass integrated gasification combined cycle. The influence of important factor recycling ratio of unreacted syngas （Ru） which will determine the exergy ratio of chemical product to power （γ） was also investigated. From the synergetic viewpoint of chemical conversion and energy utilization, with and without shift reaction and different treatments of unreacted syngas were also discussed. The evaluation results show that the new polygeneration system can reduce energy consumption by as high as 10 percentages compared to the individual systems. Moreover, the proposed polygeneration system would be expected to realize the synergetic combination of chemical conversion and efficient utilization of chemical energy of biomass, and offer a possibility of developing new technologies for biomass-based systems.