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Journal of Thermal Science

热科学学报

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2023 , Vol. 32 >Issue 6: 2166 - 2178

DOI: https://doi.org/10.1007/s11630-023-1886-8

Thermodynamics of Cascaded Waste Heat Utilization from Flue Gas and Circulating Cooling Water

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  • 1. State Key Laboratory of New Energy Power Systems, North China Electric Power University, Beijing 102206, China 
    2. Department of Water Resources, China Institute of Water Resources and Hydropower Research, Beijing 100038, China
    3. School of Energy Power and Mechanical Engineering, North China Electric Power University, Beijing 102206, China

网络出版日期: 2023-11-26

基金资助

The authors acknowledge financial support from the National Natural Science Foundation of China (No. 51876057), the NSFC Projects of International Cooperation and Exchanges (No. 52061125101), and the Fundamental Research Funds for the Central Universities (No. 2022JG006).

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Science Press, Institute of Engineering Thermophysics, CAS and Springer-Verlag GmbH Germany, part of Springer Nature 2023
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Thermodynamics of Cascaded Waste Heat Utilization from Flue Gas and Circulating Cooling Water

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  • 1. State Key Laboratory of New Energy Power Systems, North China Electric Power University, Beijing 102206, China 
    2. Department of Water Resources, China Institute of Water Resources and Hydropower Research, Beijing 100038, China
    3. School of Energy Power and Mechanical Engineering, North China Electric Power University, Beijing 102206, China

Online published: 2023-11-26

Supported by

The authors acknowledge financial support from the National Natural Science Foundation of China (No. 51876057), the NSFC Projects of International Cooperation and Exchanges (No. 52061125101), and the Fundamental Research Funds for the Central Universities (No. 2022JG006).

Copyright

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

本文建立了厂级尺度火电厂模型，从运行参数、能耗、用水量和污染物排放等方面对火电厂余热利用情况进行了评价。该模型对旁路烟气能量梯级利用设计进行了分析，获得了较好的节能减排效果。在此基础上，提出了利用低温余热并从烟气中提取水分的设计方案。利用吸收式热泵回收余热对空气进行预热，可以回收燃煤机组的低品位热量。该方法明显减少了汽轮机低压段的抽汽量，提高了汽轮机功率，降低了煤耗。该设计使空气预热器与空气加热器之间的传热温差较小，与原旁路烟气能量梯级设计相比，㶲损失较小。本文新设计输出功率1024.28 MW，节约煤耗3.69 g (kWh)-1。此外，本设计从烟气中提取水分，回收46.48 t h-1的水。该设计使得空气预热器和空气加热器之间的换热温差小，从而产生较小的㶲损失。本文工作为研究复杂火电厂系统和传统电厂的各种节能减排方案提供理论分析。

关键词： integrated thermal power plant model; low-grade waste heat; energy cascade utilization; exergy losses; absorption heat pumps

本文引用格式

LI Yuanyuan, CHEN Xin, JIANG Shan, LU Gui . Thermodynamics of Cascaded Waste Heat Utilization from Flue Gas and Circulating Cooling Water[J]. 热科学学报, 2023 , 32(6) : 2166 -2178 . DOI: 10.1007/s11630-023-1886-8

Abstract

A detailed thermal power plant model was developed to evaluate power plant waste heat usage in terms of the operating parameters, energy consumption, water consumption, and pollutant emissions. This model was used to analyze the bypass flue gas energy cascade utilization design which provides excellent energy savings and emission reductions. This paper then presents a design to use the low-temperature waste heat and to extract water from the flue gas. The low-grade heat can be recovered from a coal-fired unit using absorption heat pumps to increase the air preheating. This method significantly reduces the turbine steam extraction in the low pressure stages which increases the turbine power and reduces the coal consumption. This design has a small heat transfer temperature difference between the air preheater and the air warmer, resulting in a smaller exergy loss. The power output of the present design was 1024.28 MW with a coal consumption savings of 3.69 g·(kWh)–1. In addition, the present design extracts moisture out of the flue gas to produce 46.48 t·h–1 of water. The main goal of this work is to provide a theoretical analysis for studying complex thermal power plant systems and various energy conservation and CO2 reduction options for conventional power plants.

Key words： integrated thermal power plant model; low-grade waste heat; energy cascade utilization; exergy losses; absorption heat pumps

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