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Title: Method of operating a coal gasifier

Abstract

A method of operating an entrained flow coal gasifier which comprises the steps of firing coal at two levels in a combustion zone with near stoichiometric air, removing molten ash from the combustion zone, conveying combustion products upwardly from the combustion zone through a reduction zone, injecting additional coal into the combustion products in the reduction zone and gasifying at least a portion of the coal to form low BTU gas, conveying the gas to a point of use, including also reducing gasifier output by modifying the ratio of air to coal supplied to the upper level of the combustion zone so that the ratio becomes increasingly substoichiometric thereby extending the gasification of coal from the reduction zone into the upper level of the combustion zone, and maintaining the lower level of coal in the combustion zone at near stoichiometric conditions so as to provide sufficient heat to maintain effective slagging conditions.

Inventors:
 [1]
  1. West Simsbury, CT
Issue Date:
Research Org.:
Sandia National Laboratories (SNL), Albuquerque, NM, and Livermore, CA (United States)
OSTI Identifier:
863427
Patent Number(s):
4168956
Assignee:
Combustion Engineering, Inc. (Windsor, CT)
Patent Classifications (CPCs):
C - CHEMISTRY C10 - PETROLEUM, GAS OR COKE INDUSTRIES C10J - PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES
Y - NEW / CROSS SECTIONAL TECHNOLOGIES Y10 - TECHNICAL SUBJECTS COVERED BY FORMER USPC Y10S - TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
DOE Contract Number:  
AC04-76
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
method; operating; coal; gasifier; entrained; flow; comprises; steps; firing; levels; combustion; zone; near; stoichiometric; air; removing; molten; ash; conveying; products; upwardly; reduction; injecting; additional; gasifying; portion; form; btu; gas; including; reducing; output; modifying; ratio; supplied; upper; level; increasingly; substoichiometric; extending; gasification; maintaining; conditions; provide; sufficient; heat; maintain; effective; slagging; reduction zone; btu gas; reducing gas; coal gasifier; combustion products; combustion zone; coal gas; provide sufficient; combustion product; sufficient heat; near stoichiometric; entrained flow; removing molten; flow coal; stoichiometric air; /48/

Citation Formats

Blaskowski, Henry J. Method of operating a coal gasifier. United States: N. p., 1979. Web.
Blaskowski, Henry J. Method of operating a coal gasifier. United States.
Blaskowski, Henry J. Mon . "Method of operating a coal gasifier". United States. https://www.osti.gov/servlets/purl/863427.
@article{osti_863427,
title = {Method of operating a coal gasifier},
author = {Blaskowski, Henry J},
abstractNote = {A method of operating an entrained flow coal gasifier which comprises the steps of firing coal at two levels in a combustion zone with near stoichiometric air, removing molten ash from the combustion zone, conveying combustion products upwardly from the combustion zone through a reduction zone, injecting additional coal into the combustion products in the reduction zone and gasifying at least a portion of the coal to form low BTU gas, conveying the gas to a point of use, including also reducing gasifier output by modifying the ratio of air to coal supplied to the upper level of the combustion zone so that the ratio becomes increasingly substoichiometric thereby extending the gasification of coal from the reduction zone into the upper level of the combustion zone, and maintaining the lower level of coal in the combustion zone at near stoichiometric conditions so as to provide sufficient heat to maintain effective slagging conditions.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1979},
month = {1}
}

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