Alkaline sorbent injection for mercury control
First Claim
1. A mercury removal system for removing mercury from a flue gas generated in a combustion system having a boiler and a stack, comprising:
- an alkaline sorbent source;
particulate removal means for separating and removing particulate matter containing mercury from a boiler flue gas, the particulate removal means located between the boiler and the stack; and
sorbent injection means for providing an alkaline sorbent in one of powdered and slurried form to to the boiler flue gas having a temperature below 2000°
F., the sorbant injection means being located upstream of the stack and further being fluidically connected to the alkaline sorbent source, the alkaline sorbent containing at least one element selected from the alkaline earth elements and further being provided in a stoichiometric molar ratio of alkaline earth to sulfur of less than 1 mole alkaline earth/mole sulfur.
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Abstract
A mercury removal system for removing mercury from combustion flue gases is provided in which alkaline sorbents at generally extremely low stoichiometric molar ratios of alkaline earth or an alkali metal to sulfur of less than 1.0 are injected into a power plant system at one or more locations to remove at least between about 40% and 60% of the mercury content from combustion flue gases. Small amounts of alkaline sorbents are injected into the flue gas stream at a relatively low rate. A particulate filter is used to remove mercury-containing particles downstream of each injection point used in the power plant system.
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Citations
20 Claims
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1. A mercury removal system for removing mercury from a flue gas generated in a combustion system having a boiler and a stack, comprising:
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an alkaline sorbent source;
particulate removal means for separating and removing particulate matter containing mercury from a boiler flue gas, the particulate removal means located between the boiler and the stack; and
sorbent injection means for providing an alkaline sorbent in one of powdered and slurried form to to the boiler flue gas having a temperature below 2000°
F., the sorbant injection means being located upstream of the stack and further being fluidically connected to the alkaline sorbent source, the alkaline sorbent containing at least one element selected from the alkaline earth elements and further being provided in a stoichiometric molar ratio of alkaline earth to sulfur of less than 1 mole alkaline earth/mole sulfur.- View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A mercury removal system for removing mercury from a flue gas generated in a combustion system having a boiler and a stack, comprising:
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an alkaline sorbent source;
particulate removal means for separating and removing particulate matter containing mercury from a boiler flue gas, the particulate removal means located between the boiler and the stack; and
sorbent injection means for providing an alkaline sorbent in one of powdered and slurried form to the boiler flue gas having a temperature below 2000°
F., the sorbent injection means being located upstream of the stack and further being fluidically connected to the alkaline sorbent source, the alkaline sorbent containing at least one element selected from the alkali metals and further being provided in a stoichiometric molar ratio of alkali metal to sulfur of less than 1 mole alkali metal/mole sulfur.- View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18, 19)
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20. A mercury removal system for removing mercury from a flue gas generated in a combustion system having a boiler and a stack, comprising:
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an alkaline sorbent source;
particulate removal means for separating and removing particulate matter containing mercury from a boiler flue gas, the particulate removal means located between the boiler and the stack; and
sorbent injection means for providing au alkaline sorbent in one of powdered and slurried form to the boiler flue gas having a temperature below 2000°
F., the sorbent injection means being located upstream of the stack fluidically connected to the alkaline sorbent source, the alkaline sorbent containing a combination of at least one element selected from the alkaline earth elements and at least one element selected from the alkali metals, and the sorbent further being provided in a stoichiometric molar ratio of alkaline earth and alkali metal to sulfur of less than 1 mole alkaline earth and alkali metal/mole sulfur.
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Specification