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US 8,524,179 B2Granted
Hot-side method and system
AssigneeADA-ES, Inc.
InventorsMichael D. Durham, Sharon Sjostrom, Kenneth E. Baldrey
Life of this patent
Estimating the term…
Abstract
The present disclosure is directed to the use of elemental or speciated iodine and bromine to control total mercury emissions.
Claims31
A method, comprising:
- generating from a mercury-containing feed material a mercury-containing gas stream comprising vapor-phase elemental mercury and a vapor-phase halogen;
- contacting the mercury-containing gas stream with a reactive surface agent upstream of an air preheater, the reactive surface agent and vapor phase halogen converting elemental mercury into ionic mercury and collecting the ionic mercury on the reactive surface agent, wherein at least one of the following is true:
- (a) the reactive surface agent comprises a porous carbonaceous material and the reactive surface agent is added to the mercury-containing gas stream and (b) the reactive surface agent comprises a noncarbonaceous material to provide surface area for mercury collection;
- and
- removing the ionic mercury active agent and reactive surface agent from the mercury-containing gas stream.
2 more elements
A method, comprising:
- providing a mercury-containing gas stream comprising vapor-phase elemental mercury;
- contacting the mercury-containing gas stream with a carbonaceous reactive surface agent upstream of an air preheater, the reactive surface agent comprising at least one of iodine and bromine to collect the ionic mercury on the reactive surface agent;
- and
- removing the mercury-loaded reactive surface agent from the gas stream, wherein at least one of the following is true:
- (a) the reactive surface agent is added to the mercury-containing gas stream and (b) the reactive surface agent is added to the mercury-containing gas stream in addition to a carbonaceous reactive surface material derived from combustion of a mercury-containing feed material, the mercury-containing gas stream being derived from the mercury-containing feed material.
2 more elements
A method, comprising:
- generating from a mercury-containing feed material a mercury-containing gas stream comprising vapor-phase elemental mercury and a vapor-phase halogen;
- contacting the mercury-containing gas stream with a reactive surface agent upstream of an air preheater, the reactive surface agent and vapor phase halogen converting elemental mercury into ionic mercury and collecting the ionic mercury on the reactive surface agent;
- and
- removing the ionic mercury active agent and reactive surface agent from the mercury-containing gas stream, wherein the reactive surface agent comprises a mercury-active agent and wherein the mercury-active agent is a base metal oxide.
1 more element
Dependencies are inferred from the claim text.