Recovering waste heat from flue gas of combined heat and power plants for district heating in China

Haichao Wang, Xiaozhou Wu, Lin Duanmu, Miika Rämä

Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientificpeer-review

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Currently, the flue gas heat recovery rate is very low in China. But flue gas can contain a large amount of waste heat according to the heat balance of the boiler. In the meantime, flue gas heat loss also dominates different kinds of heat losses for a boiler. Therefore, it is necessary to reduce the flue gas temperature and recover sensible and latent heat for district heating purpose. This paper discusses the application mode of a flue gas scrubber for a combined heat and power (CHP) plant, calculate the flue gas recovery rate using absorption heat pumps and analyse the feasibility for a real case study in China. The results show that the maximum heat recovery rate is about 8% if the flue gas can be cooled down to 30°C, and the payback time for the flue gas scrubber is around 5 years.
Original languageEnglish
Title of host publicationProceedings Roomvent & Ventilation 2018
PublisherSIY Sisäilmatieto Oy
Number of pages6
ISBN (Electronic)978-952-5236-48-4
Publication statusPublished - 2018
MoE publication typeA4 Conference publication
EventRoomvent & Ventilation Conference
- Espoo, Finland
Duration: 2 Jun 20185 Jun 2018


ConferenceRoomvent & Ventilation Conference


  • waste heat
  • heat recovery
  • scrubber
  • combined heat and power (CHP)
  • district heating


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