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Title: Gasification of high ash, high ash fusion temperature bituminous coals

Abstract

This invention relates to gasification of high ash bituminous coals that have high ash fusion temperatures. The ash content can be in 15 to 45 weight percent range and ash fusion temperatures can be in 1150.degree. C. to 1500.degree. C. range as well as in excess of 1500.degree. C. In a preferred embodiment, such coals are dealt with a two stage gasification process--a relatively low temperature primary gasification step in a circulating fluidized bed transport gasifier followed by a high temperature partial oxidation step of residual char carbon and small quantities of tar. The system to process such coals further includes an internally circulating fluidized bed to effectively cool the high temperature syngas with the aid of an inert media and without the syngas contacting the heat transfer surfaces. A cyclone downstream of the syngas cooler, operating at relatively low temperatures, effectively reduces loading to a dust filtration unit. Nearly dust- and tar-free syngas for chemicals production or power generation and with over 90%, and preferably over about 98%, overall carbon conversion can be achieved with the preferred process, apparatus and methods outlined in this invention.

Inventors:
; ;
Publication Date:
Research Org.:
SOUTHERN COMPANY, Birmingham, AL (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1225788
Patent Number(s):
9,181,502
Application Number:
13/936,457
Assignee:
SOUTHERN COMPANY
DOE Contract Number:  
NT0000749
Resource Type:
Patent
Resource Relation:
Patent File Date: 2013 Jul 08
Country of Publication:
United States
Language:
English
Subject:
01 COAL, LIGNITE, AND PEAT

Citation Formats

Liu, Guohai, Vimalchand, Pannalal, and Peng, WanWang. Gasification of high ash, high ash fusion temperature bituminous coals. United States: N. p., 2015. Web.
Liu, Guohai, Vimalchand, Pannalal, & Peng, WanWang. Gasification of high ash, high ash fusion temperature bituminous coals. United States.
Liu, Guohai, Vimalchand, Pannalal, and Peng, WanWang. 2015. "Gasification of high ash, high ash fusion temperature bituminous coals". United States. https://www.osti.gov/servlets/purl/1225788.
@article{osti_1225788,
title = {Gasification of high ash, high ash fusion temperature bituminous coals},
author = {Liu, Guohai and Vimalchand, Pannalal and Peng, WanWang},
abstractNote = {This invention relates to gasification of high ash bituminous coals that have high ash fusion temperatures. The ash content can be in 15 to 45 weight percent range and ash fusion temperatures can be in 1150.degree. C. to 1500.degree. C. range as well as in excess of 1500.degree. C. In a preferred embodiment, such coals are dealt with a two stage gasification process--a relatively low temperature primary gasification step in a circulating fluidized bed transport gasifier followed by a high temperature partial oxidation step of residual char carbon and small quantities of tar. The system to process such coals further includes an internally circulating fluidized bed to effectively cool the high temperature syngas with the aid of an inert media and without the syngas contacting the heat transfer surfaces. A cyclone downstream of the syngas cooler, operating at relatively low temperatures, effectively reduces loading to a dust filtration unit. Nearly dust- and tar-free syngas for chemicals production or power generation and with over 90%, and preferably over about 98%, overall carbon conversion can be achieved with the preferred process, apparatus and methods outlined in this invention.},
doi = {},
url = {https://www.osti.gov/biblio/1225788}, journal = {},
number = ,
volume = ,
place = {United States},
year = {Fri Nov 13 00:00:00 EST 2015},
month = {Fri Nov 13 00:00:00 EST 2015}
}

Works referenced in this record:

Process of gasifying fine-grained solid fuels
patent, August 1982


Method and apparatus for treating wastes by gasification
patent, September 2002


Continuous fine ash depressurization system
patent, November 2011


Gas Treatment Apparatus and Method
patent-application, May 2004