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Flexible operation of magnetocaloric heat pump in a natural gas reduction station.

Number: 0635

Author(s) : LIANG J., ALAINE BOULET M. A., ENGELBRECHT K., SEEGER A. N., SITTIG T., BENKE D., FRIES M., BAHL C., ELMEGAARD B.

Summary

Natural gas is transported in pipelines at high pressure (~8 MPa) over long distances to reduce the size of the pipes, pressure drop losses, and the costs. To distribute the gas locally along the pipeline the pressure must be reduced before the gas enters the local distribution system. The expansion processes are applied for this purpose in the 42 Monitoring and Regulations (M/R) stations in Denmark. The decompression process causes the gas temperature to decrease, which can cause problems of gas hydrate formation in pipelines. The gas must be preheated before entering the expansion valve, which is currently done using a natural gas-fired boiler in the M/R stations. Heat pump integration for the preheating system in the M/R station is a promising solution toward carbon neutrality. However, the unstable heat duties and temperatures pose additional challenges to the heat pump operations. The flexible operation of a novel magnetocaloric heat pump (MCHP) is studied via a numerical model with experimental validation for this purpose. The magnetocaloric heat pump is based on the active magnetic regenerator system that uses the reversible magnetocaloric effect of a solid-state refrigerant with no direct global warming potential to build a heating/cooling cycle. By tuning the fluid flow profile and cycle frequency, the average COP increase during the summer operation is ~300% relative to the full-load operation. The limits for the MCHP applied in M/R stations are identified, which can guide further application.

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Pages: 11

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Details

  • Original title: Flexible operation of magnetocaloric heat pump in a natural gas reduction station.
  • Record ID : 30031440
  • Languages: English
  • Subject: Technology
  • Source: Proceedings of the 26th IIR International Congress of Refrigeration: Paris , France, August 21-25, 2023.
  • Publication date: 2023/08/21
  • DOI: http://dx.doi.org/10.18462/iir.icr.2023.0635

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