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Title: Coal combustion system

Abstract

In a coal combustion system suitable for a gas turbine engine, pulverized coal is transported to a rich zone combustor and burned at an equivalence ratio exceeding 1 at a temperature above the slagging temperature of the coal so that combustible hot gas and molten slag issue from the rich zone combustor. A coolant screen of water stretches across a throat of a quench stage and cools the combustible gas and molten slag to below the slagging temperature of the coal so that the slag freezes and shatters into small pellets. The pelletized slag is separated from the combustible gas in a first inertia separator. Residual ash is separated from the combustible gas in a second inertia separator. The combustible gas is mixed with secondary air in a lean zone combustor and burned at an equivalence ratio of less than 1 to produce hot gas motive at temperature above the coal slagging temperature. The motive fluid is cooled in a dilution stage to an acceptable turbine inlet temperature before being transported to the turbine.

Inventors:
 [1];  [2];  [3]
  1. (Lebanon, IN)
  2. (Carmel, IN)
  3. (Indianapolis, IN)
Publication Date:
Research Org.:
Sandia National Laboratories (SNL), Albuquerque, NM, and Livermore, CA
OSTI Identifier:
866706
Patent Number(s):
US 4768446
Assignee:
General Motors Corporation (Detroit, MI) SNL
DOE Contract Number:  
AC04-76
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
coal; combustion; suitable; gas; turbine; engine; pulverized; transported; rich; zone; combustor; burned; equivalence; ratio; exceeding; temperature; slagging; combustible; hot; molten; slag; issue; coolant; screen; water; stretches; throat; quench; stage; cools; below; freezes; shatters; pellets; pelletized; separated; inertia; separator; residual; ash; mixed; secondary; air; lean; produce; motive; fluid; cooled; dilution; acceptable; inlet; inlet temperature; molten slag; equivalence ratio; coal combustion; pulverized coal; turbine engine; gas turbine; hot gas; combustible gas; secondary air; motive fluid; rich zone; /110/60/

Citation Formats

Wilkes, Colin, Mongia, Hukam C., and Tramm, Peter C. Coal combustion system. United States: N. p., 1988. Web.
Wilkes, Colin, Mongia, Hukam C., & Tramm, Peter C. Coal combustion system. United States.
Wilkes, Colin, Mongia, Hukam C., and Tramm, Peter C. Fri . "Coal combustion system". United States. https://www.osti.gov/servlets/purl/866706.
@article{osti_866706,
title = {Coal combustion system},
author = {Wilkes, Colin and Mongia, Hukam C. and Tramm, Peter C.},
abstractNote = {In a coal combustion system suitable for a gas turbine engine, pulverized coal is transported to a rich zone combustor and burned at an equivalence ratio exceeding 1 at a temperature above the slagging temperature of the coal so that combustible hot gas and molten slag issue from the rich zone combustor. A coolant screen of water stretches across a throat of a quench stage and cools the combustible gas and molten slag to below the slagging temperature of the coal so that the slag freezes and shatters into small pellets. The pelletized slag is separated from the combustible gas in a first inertia separator. Residual ash is separated from the combustible gas in a second inertia separator. The combustible gas is mixed with secondary air in a lean zone combustor and burned at an equivalence ratio of less than 1 to produce hot gas motive at temperature above the coal slagging temperature. The motive fluid is cooled in a dilution stage to an acceptable turbine inlet temperature before being transported to the turbine.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1988},
month = {1}
}

Patent:

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