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Integrated gasification combined cycle plant with char preparation system

  • US 9,873,840 B2
  • Filed: 09/20/2010
  • Issued: 01/23/2018
  • Est. Priority Date: 09/18/2009
  • Status: Active Grant
First Claim
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1. An Integrated Gasification Combined-Cycle (IGCC) gasifier comprising:

  • a pressure vessel comprising at least one inlet conduit that receives a supply air, a steam supply, a solid fuel, and pulverized char, and at least one outlet conduit that passes the pulverized char and syngas, the pressure vessel containing an internally-circulating fluidized bed carbonizer comprising a draft tube that receives a stream of the solid fuel surrounded by a two-zone fluidized bed system comprising an upper bed that thermally cracks tars in volatiles, and an annular fluidized bed surrounding the draft tube that carbonizes the solid fuel with fluidizing air and steam, the internally-circulating fluidized bed carbonizer producing a syngas and a char from the solid fuel;

    a syngas cooler coupled to an outlet duct of the internally-circulating fluidized bed carbonizer;

    a separator coupled to the syngas cooler that separates entrained char from the syngas;

    a syngas cleanup system having an input coupled to the at least one outlet conduit of the pressure vessel that removes contaminants from the syngas produced by the internally-circulating fluidized bed carbonizer;

    a char preparation system coupled to the separator that prepares the entrained char to be injected into the internally-circulating fluidized bed carbonizer, the char preparation system comprising;

    a cooler that removes heat from the char forming a cooled char,a pulverizer coupled to the cooler that pulverizes the cooled char, andan airlock coupled to the pulverizer; and

    an injector that receives the pulverized char from the char preparation system along with a stream of air for combustion of the pulverized char and introduces the pulverized char into the draft tube disposed in the internally-circulating fluidized bed carbonizer, whereby the pulverized char burns in the draft tube, thereby improving utilization of the solid fuel.

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