降低IGCC系统中回收CO2能耗的新思路

本文基于CO2三相图分析,归纳了CO2由气态(常温常压)转变为液态或固态的四种途径,提出了压缩-制冷液化结合法降低IGCC系统中回收CO2能耗的新思路,并基于这个思路设计了由半闭式循环与单级氨吸收制冷逆循环耦合的IGCC新系统,为开拓研究高效的CO2准零排放IGCC新系统提供可行的途径与方案.

NEW IDEA OF REDUCING THE POWER CONSUMPTION OF CO2 RECOVERY IN IGCC SYSTEM

Based on an analysis of three-phase diagram of CO2, this paper analyzes four ways as well as their characteristics to convert CO2 into liquid or solid phase and presents a new way to recover CO2 with less power consumption by using a combined method of compression and refrigeration. A new IGCC system, which is composed of a semi-closed cycle system and a single-stage ammonia absorption refrigeration system, has been proposed. The thermodynamic characteristics of the system are revealed. Some important conclusions are obtained as follows: it can make the best use of waste heat energy and improve the performance of IGCC; XCO2, coefficient of heat-to-work conversion, is the key factor of system performance; raising the inlet pressure of compressor is beneficial to system efficiency, etc. The achievements will provide new idea and method for high-efficiency IGCC system with CO2 quasi-zero emission.