Enhanced injection of mercury oxidants
AssigneeEcolab USA Inc.
InventorsNicholas Ryan Denny, John V. Meier, Daniel Eugene Schwarz, Peter E. Reed
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Abstract
The disclosure relates generally to reducing mercury emissions from a coal power plant. Specifically, a method for treating a gas stream containing mercury is provided that includes injecting a mercury oxidant or absorbent and a carrying agent into a gas stream that was produced by heating or burning a carbonaceous fuel comprising mercury. The carrying agent vaporizes after being injected into the gas stream. The mercury oxidant or absorbent and a carrying agent may be injected before passing the gas stream into a gas scrubber.
Claims13
A method of treating a gas stream containing mercury, comprising:
- injecting a composition into the gas stream before passing the gas stream into a gas scrubber, wherein the composition consists of an absorbent and a carrying agent;
- and
- vaporizing the carrying agent in the composition after injecting the composition into the gas stream;
- wherein the absorbent is selected from the group consisting of copper sulfate, polysulfide, and a mixture of copper sulfate and polysulfide;
- and
- wherein the absorbent does not comprise a halogen oxidant or silica.
A method of reducing mercury emissions in a flue gas, comprising:
- injecting a composition into the flue gas before passing the flue gas into a flue gas scrubber, wherein the composition consists of an absorbent and a carrying agent, and the flue gas comprises mercury;
- and
- vaporizing the carrying agent in the composition after injecting the composition into the flue gas;
- wherein the absorbent is selected from the group consisting of copper sulfate, polysulfide, and a mixture of copper sulfate and polysulfide;
- and
- wherein the absorbent does not comprise a halogen oxidant or silica.
A method of reducing mercury emissions, comprising:
- burning a carbonaceous fuel comprising mercury;
- thereby producing a flue gas;
- and
- injecting a composition into the flue gas before passing the flue gas into a flue gas scrubber, wherein the composition consists of an absorbent and water, and the composition is injected into the flue gas as a mist comprising water droplets that vaporize;
- wherein the absorbent is selected from the group consisting of copper sulfate, polysulfide, and a mixture of copper sulfate and polysulfide;
- and
- wherein the absorbent does not comprise a halogen oxidant or silica.
Dependencies are inferred from the claim text.