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

Patent · Tue Jan 01 04:00:00 EST 1991

OSTI ID:867977

Rochelle, Gary T ^[1]; Chang, John C. S. ^[2]

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1. Austin, TX
2. Cary, NC

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.

• Research Organization: University of Texas
• DOE Contract Number: FG22-85PC81006
• 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.
• Patent Number(s): US 5047222
• OSTI ID: 867977
• Country of Publication: United States
• Language: English

Related Subjects

/423/
above-ambient
accordance
achieving
achieving improved
additionally
addressed
alkali
alumina
aluminates
ambient temperature
ambient temperatures
application
aqueous
aqueous slurry
bagfilter
calcium
calcium silicate
capabilities
components
composed
configurations
conjunction
containing gas
containing gases
demonstrate
disclosed
disclosure
disclosure relates
dry
dryer
employing
examples
existing
facilitate
flue
flue gas
fly-ash
formation
gas
gases
heat-treated
heating
hot
hot sulfur-containing
illustrates
improved
improved process
improved processes
injection
period
preferred
preferred configuration
preparing
process
processes
provided
reactive
reactive silica
relates
remove
remove sulfur
removing
removing sulfur
retrofit
silica
silicates
slurry
sorbent
source
spray
spray dryer
sulfur
sulfur therefrom
sulfur-absorbing
sulfur-containing
sulfur-containing flue
sulfur-containing gas
sulfur-containing gases
systems
temperatures
therefrom
time
treated slurry
treating
treating hot
utility