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

Patent · 01 January 1976

OSTI ID:862481

Donath, Ernest E ^[1]

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1. Christiansted, St. Croix, VI

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.

• Assignee: United states of America as represented by United States Energy (Washington, DC)
• Patent Number(s): US 3945809
• OSTI ID: 862481
• Country of Publication: United States
• Language: English

Related Subjects

/48/201/209/252/
agglomerated
apparatus
bottom
caking
caking coal
carbon
char
char particles
clogging
coal
coal gas
coal gasification
coal gasifier
coal particle
coal particles
coarse
communicating
containing
containing hydrogen
containing methane
counter-current
entrained
gas
gas containing
gas passes
gasification
gasification process
gasified
gasifier
heavy
hydrogen
injected
methane
method
outlet
oversized
oxides
oxygen
partially
particles
passage
passes
passes upward
plugging
prevent
process
product
product gas
react
reacting
recycled
removed
removing
result
separated
stage
stage coal
stages
steam
synthesis
synthesis gas
two-stage
two-stage coal
unentrained
unentrained char
upwardly
yield