基于锂循环吸附CO2的燃煤发电系统热力特性研究

Study on Thermodynamic Characteristics of Coal-Fired Power Generation System Based on Lithium Looping Cycle for CO2 Adsorption

燃烧后捕集CO2与余热回收利用相结合是一种降低CO2排放同时提高燃煤电厂发电功率的方式。本文采用As-penPlus软件建立了基于锂循环吸附CO2的燃煤发电系统模型,并对锂基吸附剂系统关键参数进行敏感性分析。结果表明:锂基吸附剂系统理论发电热效率较钙基吸附剂系统提高了1.92个百分点;CO2捕集率及吸附剂平均转化率对锂基吸附剂系统发电功率影响幅度均超过5%;提高CO2捕集率可提高发电功率,提高余热利用率可提高发电功率及理论发电热效率。

Combining post-combustion CO2 capture with waste heat recovery is a way to reduce CO2 emissions and improve power generation in coal-fired power plants.In this paper,Aspen Plus software was used to establish a coal-fired power generation system model based on lithium cyclic adsorption of CO2,and sensitivity analysis of key parameters of lithium-based adsorbent system was carried out.The results show that the theoretical thermal efficiency of lithium-based adsorbent system is 1.92 percentage points higher than that of calcium-based adsorbent system.And the influence of CO2 capture rate and average conversion rate of adsorbent on power generation of lithium-based adsorbent system are both more than 5%.Increasing CO2 capture rate can increase power generation,and increasing waste heat utilization rate can improve power generation and theoretical thermal efficiency.