基于加压吸氧化学链制氧的富氧燃烧系统建模及分析  

Modeling of oxy-fuel combustion system coupling with pressurized oxidation chemical looping air separation

作　　者：吴二东 史彬 鄢烈祥 

机构地区：[1]武汉理工大学化学化工与生命科学学院,湖北武汉430070

出　　处：《热力发电》2018年第1期78-85,共8页Thermal Power Generation

基　　金：国家自然科学基金项目(21376185);中央高校基本科研基金(2017zy154)~~

摘　　要：富氧燃烧为二氧化碳的捕集与储存提供了非常有效的途径,然而富氧燃烧用到的深冷空气分离(深冷空分)制氧技术会消耗大量电能,并且随着制氧体积分数的增加,制氧功耗也会增加。化学链制氧是一种有效的为富氧燃烧提供低能耗高纯度氧气的制氧方法。本文采用加压吸氧化学链制氧方法解决常规化学链制氧中还原反应吸热量过大问题,并对耦合深冷空分制氧、常规化学链制氧、加压吸氧化学链制氧的富氧燃烧流程进行模拟分析对比。结果表明:加压吸氧化学链制氧甲烷消耗量为常规化学链的12.7%,耦合加压吸氧化学链制氧的富氧燃烧系统净效率可以达到34.0%,且在基础投资和运行成本上均优于深冷空分制氧系统和常规化学链制氧系统。Oxy-fuel combustion provides a very efficient way to capture and store carbon dioxide. However, oxy- fuel combustion with cryogenic air separation unit （CASU） will consume large amount of power, and the power consumption of oxygen preparation will increase with the oxygen concentration. Chemical looping air separation （CLAS） is an effective oxygen generation method for oxy-fuel combustion with little energy consumption and high purity oxygen content. In order to solve the problem of excessive heat consumption in the process of reduction reaction in conventional chemical looping air separation unit, the pressurized oxidation chemical looping air separation method was applied in this paper. Simulation on the oxy-fuel combustion process coupled with cryogenic air separation unit, conventional chemical looping air separation, and pressurized oxidation chemical looping air separation were carried out. The results show that, the methane consumed during oxygen preparation using the pressurized oxidation system is 12.7% of that using the conventional chemical looping, and the net efficiency of the oxy-fuel combustion system with coupled pressurized oxidation chemical looping air separation can achieve 34.0%. This system is superior to the CASU and CLAS in respects of basic investment and operation costs.

关 键 词：加压吸氧 二氧化碳捕集 煤燃烧 还原 深冷空气分离 化学链制氧 富氧燃烧 ASPEN Plus 

分 类 号：TK112[动力工程及工程热物理—热能工程]