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IIR document

Large-scale mechanical vapor recompression drying process in superheated steam.

Number: pap. n. 1246

Author(s) : MADSBOLL H., LARSEN K. G.

Summary

Large-scale fluid bed superheated steam drying units have been used for fibrous products such as sugarbeet pulp, and wood chips etc. as an energy efficient alternative to the standard method of heated air/flue gas in a drum dryer. The heat source is steam from nearby power plants due to the huge capacity requirements of steam at approx. 25 bar. An alternative to this method is the vapor recompression method, where steam is recompressed from approx. 3 bar to the inlet pressure of approx. 25 bar at design point operation. The benefits are significant energy savings and the use of electrical energy instead of fossil fuels. Such a unit has been modelled with a selection of centrifugal compressor designs. The model shows the energy balances, the pressure ratio, and the mass flow in the full drying unit, and it can be used to analyze part load operation, control strategy, energy consumption, preferred compressor characteristics etc.

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Pages: 8

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Details

  • Original title: Large-scale mechanical vapor recompression drying process in superheated steam.
  • Record ID : 30026523
  • 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.2019.1246

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