A Study of Boiler Flue Gas Heat Recovery for Energy Saving

DOI

10.2991/978-94-6463-688-8_35How to use a DOI?

Keywords

waste heat recovery; flue gas heat; electric heat pump

Abstract

The flue gas emitted from conventional natural gas boilers contains a large amount of water vapor, which cannot effectively recover the latent heat of water vapor condensation due to its failure to lower the flue gas temperature below the dew point temperature. This study adopts a heat pump and a counter-current heat exchanger to recover the waste heat of natural gas boiler flue gas. The field test results show that the average exhaust temperature of the system is 27.1℃, and the system can raise the average return water temperature of the heating network from 40.9℃ to 55.0℃. The actual recovered heat power is 10% of the average power of the boiler, and the average coefficient of performance (COP) is about 4.6. The economic analysis shows that the cost of waste heat recovery of the system is about 139 million yuan, and it can save 61million yuan per year. The payback period is 2.3 years.

Copyright

© 2025 The Author(s)

Open Access

Open Access This chapter is licensed under the terms of the Creative Commons Attribution-NonCommercial 4.0 International License (http://creativecommons.org/licenses/by-nc/4.0/), which permits any noncommercial use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license and indicate if changes were made.

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TY  - CONF
AU  - Haining Liu
AU  - Yuqing Zhao
PY  - 2025
DA  - 2025/04/30
TI  - A Study of Boiler Flue Gas Heat Recovery for Energy Saving
BT  - Proceedings of the 2024 6th International Conference on Civil Architecture and Urban Engineering (ICCAUE 2024)
PB  - Atlantis Press
SP  - 339
EP  - 345
SN  - 2352-5401
UR  - https://doi.org/10.2991/978-94-6463-688-8_35
DO  - 10.2991/978-94-6463-688-8_35
ID  - Liu2025
ER  -