Feasibility study on the coupling application of flue gas waste heat recovery and energy storage technology

doi:10.3969/j.issn.1674-1951.2021.09.008

Abstract

Abstract:

To achieve carbon neutrality,we must boost energy efficiency.Flue gas waste heat recovery is an important way to save energy and improve efficiencies of existing coal-fired units.At the same time,energy storage technology is of application prospect for being able to match“source-load”across time and space.Three flue gas waste heat recovery technologies,flue gas waste heat recovery under variable working conditions（350~400 ℃）,combined operation of low-temperature economizers and heaters（122~160 ℃）and flue gas waste heat recovery with direct expansion heat pumps（77~180 ℃）,are introduced,and so do the three energy storage technologies,compressed air energy storage （200~400 ℃）,liquid air energy storage（-200 ℃）and thermal energy storage（90~200 ℃）.Considering the matching of temperatures for flue gas waste heat recovery and energy storage technologies,the potential energy utilization forms of flue gas waste heat recovery technologies coupled with compressed air energy storage and thermal energy storage technology are proposed,and their operation performances are discussed.They provide theoretical references for efficient flue gas waste heat recovery and parameter design to improve unit flexibility.

Key words: flue gas waste heat recovery, energy storage technology, compressed air energy storage, thermal energy storage, air preheater, carbon neutrality, heat pump

CLC Number:

TK09：X783

GUO Puwei, PENG Yue, DENG Jingmin, LI Bingfa, ZHOU Xing, HU Yun, GUO Haiqiang, WANG Jinxing. Feasibility study on the coupling application of flue gas waste heat recovery and energy storage technology[J]. Huadian Technology, 2021, 43(9): 62-68.

Figures/Tables 8

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