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Title: Method and apparatus for removing coarse unentrained char particles from the second stage of a two-stage coal gasifier

A method and apparatus for removing oversized, unentrained char particles from a two-stage coal gasification process so as to prevent clogging or plugging of the communicating passage between the two gasification stages. In the first stage of the process, recycled process char passes upwardly while reacting with steam and oxygen to yield a first stage synthesis gas containing hydrogen and oxides of carbon. In the second stage, the synthesis gas passes upwardly with coal and steam which react to yield partially gasified char entrained in a second stage product gas containing methane, hydrogen, and oxides of carbon. Agglomerated char particles, which result from caking coal particles in the second stage and are too heavy to be entrained in the second stage product gas, are removed through an outlet in the bottom of the second stage, the particles being separated from smaller char particles by a counter-current of steam injected into the outlet.
Inventors:
 [1]
  1. (Christiansted, St. Croix, VI)
Issue Date:
OSTI Identifier:
862481
Assignee:
United states of America as represented by United States Energy (Washington, DC) OSTI
Patent Number(s):
US 3945809
Contract Number:
OCR2209
Country of Publication:
United States
Language:
English
Subject:
method; apparatus; removing; coarse; unentrained; char; particles; stage; two-stage; coal; gasifier; oversized; gasification; process; prevent; clogging; plugging; communicating; passage; stages; recycled; passes; upwardly; reacting; steam; oxygen; yield; synthesis; gas; containing; hydrogen; oxides; carbon; react; partially; gasified; entrained; product; methane; agglomerated; result; caking; heavy; removed; outlet; bottom; separated; counter-current; injected; coal particle; gas passes; containing hydrogen; coal gasifier; product gas; gas containing; synthesis gas; coal gasification; coal particles; gasification process; coal gas; two-stage coal; containing methane; char particles; passes upward; unentrained char; stage coal; caking coal; /48/201/209/252/