Method for reducing sulfate formation during regeneration of hot-gas desulfurization sorbents

Patent · Sat Jan 01 00:00:00 EST 1994

OSTI ID:869507

Bissett, Larry A ^[1]; Strickland, Larry D ^[1]; Rockey, John M ^[2]

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1. Morgantown, WV
2. Westover, WV

The regeneration of sulfur sorbents having sulfate forming tendencies and used for desulfurizing hot product gas streams such as provided by coal gasification is provided by employing a two-stage regeneration method. Air containing a sub-stoichiometric quantity of oxygen is used in the first stage for substantially fully regenerating the sorbent without sulfate formation and then regeneration of the resulting partially regenerated sorbent is completed in the second stage with air containing a quantity of oxygen slightly greater than the stoichiometric amount adequate to essentially fully regenerate the sorbent. Sulfate formation occurs in only the second stage with the extent of sulfate formation being limited only to the portion of the sulfur species contained by the sorbent after substantially all of the sulfur species have been removed therefrom in the first stage.

• Research Organization: National Energy Technology Laboratory (NETL), Pittsburgh, PA, Morgantown, WV (United States)
• Assignee: United States of America as represented by United States (Washington, DC)
• Patent Number(s): US 5348921
• OSTI ID: 869507
• Country of Publication: United States
• Language: English

Related Subjects

method
reducing
sulfate
formation
regeneration
hot-gas
desulfurization
sorbents
sulfur
forming
tendencies
desulfurizing
hot
product
gas
streams
provided
coal
gasification
employing
two-stage
air
containing
sub-stoichiometric
quantity
oxygen
stage
substantially
regenerating
sorbent
resulting
partially
regenerated
completed
slightly
stoichiometric
amount
adequate
essentially
regenerate
occurs
extent
limited
portion
species
contained
removed
therefrom
sulfur sorbent
hot product
sulfate formation
gas desulfurization
product gas
gas stream
gas streams
coal gasification
coal gas
air containing
stoichiometric amount
removed therefrom
stoichiometric quantity
sulfur sorbents
hot-gas desulfurization
generation method
desulfurization sorbents
/502/423/