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

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.

Cite this article

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

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