Performance of boilers equipped with vapor-pump (BEVP) system equipped with a novel air-flue gas total heat exchanger

Jing Hua, Jingyi Wang, Tingting Zhu*

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

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Abstract

Because of high humidity and nonlinearity of flue gas, waste heat from flue gas is hard to recovery. Boilers equipped with vapor-pump system is developed to solve the problem caused by high humidity. In this system, double spray towers subsystem is equipped to realize total heat waste heat recovery. However, caused by nonlinearity, limited waste heat recovery efficiency is just 83 % (1 segment) and 93 % (2 segment). Further, based on boilers equipped with vapor-pump (BEVP) system, enthalpy wheel system is developed to solve the problem caused by nonlinearity. However, enthalpy wheel system cannot solve the problem completely. In this article, a novel air-flue gas total heat exchanger is put forward to achieve full waste heat recovery. In this system, waste heat recovery efficiency limit is up to 100 %. Then, the limit condition of total heat transfer process is discussed. Performance of the total heat exchanger is discussed and compared to double spray towers system and enthalpy wheel system. As the result, considering heat transfer temperature difference, the total heat exchanger total heat transfer efficiency of the total heat exchanger is 7 % higher than 2-segment BEVP system and 10 % higher than enthalpy wheel system.

Original languageEnglish
Article number109316
Number of pages13
JournalInternational journal of heat and fluid flow
Volume106
Early online date16 Feb 2024
DOIs
Publication statusPublished - Apr 2024

Keywords

  • UT-Hybrid-D
  • Gas nonlinearity
  • Heat recovery efficiency
  • Total heat recovery
  • Flue gas

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