燃烧和反应

Energy Efficiency Analysis of Oxy-Fuel Circulating Fluidized Bed Combustion System with High Oxygen Concentration

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  • 1. Institute of Engineering Thermophysics, Chinese Academy of Sciences, Beijing 100190, China
    2. University of Chinese Academy of Sciences, Beijing 100049, China

网络出版日期: 2023-10-23

基金资助

This research is supported by the National Key Research and Development Program of China (Grant No.2018YFB0605303) and Youth Innovation Promotion Association CAS (Grant No. 2020150).


版权

Science Press, Institute of Engineering Thermophysics, CAS and Springer-Verlag GmbH Germany, part of Springer Nature 2023

Energy Efficiency Analysis of Oxy-Fuel Circulating Fluidized Bed Combustion System with High Oxygen Concentration

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  • 1. Institute of Engineering Thermophysics, Chinese Academy of Sciences, Beijing 100190, China
    2. University of Chinese Academy of Sciences, Beijing 100049, China

Online published: 2023-10-23

Supported by

This research is supported by the National Key Research and Development Program of China (Grant No.2018YFB0605303) and Youth Innovation Promotion Association CAS (Grant No. 2020150).


Copyright

Science Press, Institute of Engineering Thermophysics, CAS and Springer-Verlag GmbH Germany, part of Springer Nature 2023

摘要

由于空气分离系统(ASU)和二氧化碳压缩纯化系统(CPU)的存在,循环流化床(CFB)富氧燃烧技术的净发电效率降低。高氧气浓度是提高CFB富氧燃烧技术净发电效率的一种有效手段。在本研究中,基于Aspen Plus平台进行了一系列计算和模拟,为进一步研究高氧气浓度(40%、50%)CFB富氧燃烧系统提供了有用的信息。建立的高氧气浓度CFB富氧燃烧系统模型包括ASU、CPU和CFB富氧燃烧和换热单元,通过对模拟结果进行能效分析和㶲分析获得了以下结论。50%氧气浓度CFB富氧燃烧锅炉炉膛和尾部烟道的横截面积分别为原尺寸的43%和56%,有效降低了建设和投资成本;随着氧气浓度的增加,净发电效率显著提高,在50%氧气浓度时达到了24.85%,提高6.09%;总㶲损失随氧气浓度的增加而增加,此外,辐射传热的㶲损失远高于对流传热。

本文引用格式

KONG Runjuan, LI Wei, WANG Haigang, REN Qiangqiang, . Energy Efficiency Analysis of Oxy-Fuel Circulating Fluidized Bed Combustion System with High Oxygen Concentration[J]. 热科学学报, 2023 , 32(5) : 1737 -1749 . DOI: 10.1007/s11630-023-1784-0

Abstract

The low net efficiency of oxy-fuel circulating fluidized bed (CFB) combustion is mainly due to the addition of air separation unit (ASU) and carbon dioxide compression and purification unit (CPU). High oxygen concentration is one of the effective methods to improve the net efficiency of oxy-fuel combustion technology in CFB. In this research, a series of calculation and simulation were carried out based on Aspen Plus platform to provide valuable information for further investigation on the CFB oxy-fuel combustion system with high oxygen concentration (40%, 50%). A CFB oxy-fuel combustion system model with high oxygen concentration was established including ASU, CPU and CFB oxy-fuel combustion and heat exchange unit. Based on the simulation data, energy and exergy efficiency were analyzed to obtain the following results. The cross-sectional area of furnace and tail flue of 50% CFB oxy-fuel combustion boiler are 43% and 56% of the original size respectively, reducing the construction and investment cost effectively. With the increase of oxygen concentration, the net efficiency of power generation increased significantly, reaching 24.85% and increasing by 6.09% under the condition of 50% oxy-fuel combustion. The total exergy loss increases with the increase of oxygen concentration. In addition, the exergy loss of radiation heat transfer is far higher than convection heat transfer.

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