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A novel flue gas total heat recovery system combining direct-contact condensation with liquid desiccant absorption.

Number: pap. n. 1594

Author(s) : ZHANG X., WU J., LI Z.

Summary

A condensing boiler is unable to effectively recover a large amount of latent heat carried with the water vapor in the flue gas of natural gas boilers. A heat recovery system combining direct-contact condensation with liquid desiccant absorption is then proposed in this paper. The water vapor in the flue gas is partially condensed in the direct-condenser and further absorbed by the liquid desiccant. A case study of a gas-fired boiler with this heat recovery system shows that the boiler equivalent thermal efficiency based on the natural gas lower heating value can reach 104.7% when the return water temperature is 40°C. The relative humidity of the discharged flue gas is only 30%, which avoids the formation of white smoke. This system also contributes to the mitigation of NOx and CO2 emissions. A parametric analysis indicates that the lower the return water temperature, the better the performance of this system.

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Pages: 6

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Details

  • Original title: A novel flue gas total heat recovery system combining direct-contact condensation with liquid desiccant absorption.
  • Record ID : 30026541
  • Languages: English
  • Source: Proceedings of the 25th IIR International Congress of Refrigeration: Montréal , Canada, August 24-30, 2019.
  • Publication date: 2019/08/24
  • DOI: http://dx.doi.org/10.18462/iir.icr.2019.1594

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