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Title: Process for removing sulfur from sulfur-containing gases: high calcium fly-ash

Abstract

The present disclosure relates to improved processes for treating hot sulfur-containing flue gas to remove sulfur therefrom. Processes in accordance with the present invention include preparing an aqueous slurry composed of a calcium alkali source and a source of reactive silica and/or alumina, heating the slurry to above-ambient temperatures for a period of time in order to facilitate the formation of sulfur-absorbing calcium silicates or aluminates, and treating the gas with the heat-treated slurry components. Examples disclosed herein demonstrate the utility of these processes in achieving improved sulfur-absorbing capabilities. Additionally, disclosure is provided which illustrates preferred configurations for employing the present processes both as a dry sorbent injection and for use in conjunction with a spray dryer and/or bagfilter. Retrofit application to existing systems is also addressed.

Inventors:
 [1];  [2]
  1. (Austin, TX)
  2. (Cary, NC)
Publication Date:
Research Org.:
University of Texas
OSTI Identifier:
867977
Patent Number(s):
US 5047222
Assignee:
Board of Regents, University of Texas System (Austin, TX) [*] Notice: portion of term of this patent subsequent to February 14, 2006 has been disclaimed. NETL
DOE Contract Number:  
FG22-85PC81006
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
process; removing; sulfur; sulfur-containing; gases; calcium; fly-ash; disclosure; relates; improved; processes; treating; hot; flue; gas; remove; therefrom; accordance; preparing; aqueous; slurry; composed; alkali; source; reactive; silica; alumina; heating; above-ambient; temperatures; period; time; facilitate; formation; sulfur-absorbing; silicates; aluminates; heat-treated; components; examples; disclosed; demonstrate; utility; achieving; capabilities; additionally; provided; illustrates; preferred; configurations; employing; dry; sorbent; injection; conjunction; spray; dryer; bagfilter; retrofit; application; existing; systems; addressed; containing gases; spray dryer; removing sulfur; improved process; ambient temperature; disclosure relates; flue gas; containing gas; aqueous slurry; sulfur-containing gases; remove sulfur; ambient temperatures; sulfur therefrom; sulfur-containing gas; achieving improved; preferred configuration; reactive silica; treating hot; sulfur-containing flue; hot sulfur-containing; improved processes; treated slurry; calcium silicate; /423/

Citation Formats

Rochelle, Gary T., and Chang, John C. S. Process for removing sulfur from sulfur-containing gases: high calcium fly-ash. United States: N. p., 1991. Web.
Rochelle, Gary T., & Chang, John C. S. Process for removing sulfur from sulfur-containing gases: high calcium fly-ash. United States.
Rochelle, Gary T., and Chang, John C. S. Tue . "Process for removing sulfur from sulfur-containing gases: high calcium fly-ash". United States. https://www.osti.gov/servlets/purl/867977.
@article{osti_867977,
title = {Process for removing sulfur from sulfur-containing gases: high calcium fly-ash},
author = {Rochelle, Gary T. and Chang, John C. S.},
abstractNote = {The present disclosure relates to improved processes for treating hot sulfur-containing flue gas to remove sulfur therefrom. Processes in accordance with the present invention include preparing an aqueous slurry composed of a calcium alkali source and a source of reactive silica and/or alumina, heating the slurry to above-ambient temperatures for a period of time in order to facilitate the formation of sulfur-absorbing calcium silicates or aluminates, and treating the gas with the heat-treated slurry components. Examples disclosed herein demonstrate the utility of these processes in achieving improved sulfur-absorbing capabilities. Additionally, disclosure is provided which illustrates preferred configurations for employing the present processes both as a dry sorbent injection and for use in conjunction with a spray dryer and/or bagfilter. Retrofit application to existing systems is also addressed.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1991},
month = {1}
}

Patent:

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