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:
- Issue Date:
- Research Org.:
- SOUTHERN COMPANY, Birmingham, AL (United States)
- Sponsoring Org.:
- USDOE
- OSTI Identifier:
- 1225788
- Patent Number(s):
- 9181502
- Application Number:
- 13/936,457
- Assignee:
- SOUTHERN COMPANY
- 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
C - CHEMISTRY C10 - PETROLEUM, GAS OR COKE INDUSTRIES C10K - PURIFYING OR MODIFYING THE CHEMICAL COMPOSITION OF COMBUSTIBLE GASES CONTAINING CARBON MONOXIDE
- 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. Fri .
"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 = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2015},
month = {11}
}
Works referenced in this record:
Process of gasifying fine-grained solid fuels
patent, August 1982
- Reh, Lothar; Hirsch, Martin; Baron, Gerhard
- US Patent Document 4,347,064
Process for gasifying waste materials which contain combustible constituents
patent, June 1995
- Schaub, Georg; Reimert, Rainer; Loffler, Johannes
- US Patent Document 5,425,317
Method and apparatus for treating wastes by gasification
patent, September 2002
- Fujimura, Hiroyuki; Hirayama, Yoshio; Fujinami, Shosaku
- US Patent Document 6,455,011
Method and apparatus for the separation of a gas-solids mixture in a circulating fluidized bed reactor
patent, August 2010
- Vimalchand, Pannalal; Liu, Guohai; Peng, WanWang
- US Patent Document 7,771,585
Continuous fine ash depressurization system
patent, November 2011
- Liu, Guohai; Peng, Wan Wang; Vimalchand, Pannalal
- US Patent Document 8,066,789
Electricity, heat and fuel generation system using fuel cell, bioreactor and twin-fluid bed steam gasifier
patent, January 2013
- Radovich, Michael John
- US Patent Document 8,349,504
Gas Treatment Apparatus and Method
patent-application, May 2004
- Vimalchand, Pannalal; Liu, Guohai
- US Patent Application 10/305795; 20040100902