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US 12,636,611 B2Granted
Method and system for controlling mercury emissions from coal-fired thermal processes
AssigneeARQ Solutions (ES), INC.
InventorsSharon Sjostrom, Connie Senior, Jonathan Lagarenne, Kenneth E. Baldrey, Ramon Bisque, Michael D. Durham, Nina Bergan French
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.
Claims20
A gas composition, comprising:
- coal particles comprising iodine, a bromide salt, and mercury;
- vapor phase iodine;
- vapor phase bromine;
- and
- speciated mercury comprising oxidized mercury and elemental mercury,
- wherein the vapor phase iodine comprises both a hydrogen iodine species and diatomic iodine, wherein a molecular ratio of diatomic iodine to the hydrogen iodine species is at least about 25:1, and wherein one or more of the following is true:
- (i) the gas composition comprises about 3.5 ppmw or less of the iodine;
- (ii) the gas composition comprises a molar ratio of the iodine to the speciated mercury of less than about 80;
- and
- (iii) at an air preheater outlet, a concentration of the iodine ranges from about 0.15 to about 2 ppmw.
7 more elements
A gas composition, comprising:
- coal particles comprising iodine, bromide salt, and mercury;
- diatomic iodine in the vapor phase;
- diatomic bromine in the vapor phase;
- oxidized mercury converted from an elemental form to an oxidized form at least in part by the iodine;
- a hydrogen iodine species, wherein a molecular ratio of diatomic iodine to the hydrogen iodine species is at least about 25:1;
- and
- elemental mercury,
- wherein one or more of the following is true:
- (i) the gas composition comprises about 3.5 ppmw or less of the iodine;
- (ii) the gas composition comprises a molar ratio of the iodine to the oxidized mercury, the elemental mercury, or both of less than about 80;
- and
- (iii) at an air preheater outlet, a concentration of the iodine ranges from about 0.15 to about 2 ppmw.
9 more elements
A gas composition, comprising:
- coal particles comprising native iodine, a bromide salt, and mercury;
- vapor phase iodine and bromine derived from combustion of the coal particles;
- and
- vapor phase mercury formed by combusting the coal particles, wherein the vapor phase iodine comprises both a hydrogen iodine species and diatomic iodine and wherein a molecular ratio of diatomic iodine to the hydrogen iodine species is at least about 25:1, and
- wherein one or more of the following is true:
- (i) the gas composition comprises about 3.5 ppmw or less of the vapor phase iodine;
- (ii) the gas composition comprises a molar ratio of the vapor phase iodine to the vapor phase mercury of less than about 80;
- and
- (iii) at an air preheater outlet, a concentration of the vapor phase iodine ranges from about 0.15 to about 2 ppmw.
6 more elements
Dependencies are inferred from the claim text.