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Method for using fast fluidized bed dry bottom coal gasification

  • US 4,400,181 A
  • Filed: 01/28/1982
  • Issued: 08/23/1983
  • Est. Priority Date: 01/28/1982
  • Status: Expired due to Term
First Claim
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1. A process for gasifying particulate hydrocarbon feed materials to produce a fuel gas product, having low-to-medium heating value, comprising:

  • (a) introducing the hydrocarbon feed material with steam and oxygen into a gasification zone containing a fast fluidized bed of char particles for gasification therein, said zone being maintained at temperature of 1500°

    -1850°

    F., at pressure exceeding about 30 psig, and at upward superficial gas velocity exceeding about 5 ft/sec to heat and gasify the feed and produce a gaseous material;

    (b) withdrawing said gaseous material along with char particles from the upper portion of the gasification zone and passing the materials to a primary gas-solids separation step for char solids removal;

    (c) withdrawing a first gas stream from said primary gas-solids separation step and returning particulate char solids to the gasification zone;

    (d) passing said first gas stream to a secondary gas-solids separation step and removing fine char solids therefrom;

    (e) returning the fine particulate char solids from the secondary gas-solids separation step to the lower end of a fluidized bed oxidation zone located immediately below the fast fluidized bed gasification zone;

    said oxidation zone having temperature maintained within the range of 1600°

    -2000°

    F.; and

    (f) withdrawing a fuel gas product stream from the secondary gas-solids separation step.

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