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Dehumidification method and plant particularly for granular materials

  • US 20070199203A1
  • Filed: 02/09/2007
  • Published: 08/30/2007
  • Est. Priority Date: 02/10/2006
  • Status: Active Grant
First Claim
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1. A dehumidification plant for granular materials including at least one silo or hopper (1) for containing and dehumidifying granular material (2), which is provided with a controlled lower supplying mouth (3) arranged to receive at its top granular material (2) to be dehumidified, at least one feeding duct (8, 10) for hot and dry process air designed to draw within the granular material (2) contained in each hopper (1), and at least one exhaust duct (5) for humid process air;

  • at least two molecular sieve towers (68, 69) arranged to alternately supply hot and dry process air to each hopper, each delimiting a housing chamber for molecular sieves and a housing chamber for heating means, said housing chambers being in communication one with another at an end thereof, whereas they are in communication, at their other end, with a respective air inlet/outlet duct;

    pressurizing or pumping means arranged to receive, at the suction (inlet) side, humid process air from said at least one exhaust duct, and to feed at the delivery side, pressured air to each molecular sieve tower;

    switching-shunting means placed between the delivery side of said pressurizing means and said inlet/outlet ducts of said housing chambers for molecular sieves in order to switch at least one of said molecular sieve towers between a process step and a regeneration step; and

    a programmable electronic control unit, characterized in that it comprises pressurizing valve means placed between said inlet/outlet ducts of said housing chamber of said heating means for each molecular sieve tower and arranged to assure a minimum pressure within a tower during the regeneration step, and detecting means for temperature electrically connected to said programmable electronic control unit, at its input.

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