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US 5,787,823 AGranted
Reduction of mercury in coal combustion gas system and method
OwnerBruce Mullein Knowlesinventor
Life of this patent
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Abstract
The present invention provides a system and method (1) for reducing the amount of air toxic elements, particularly mercury (16), in concentrations down to and including trace levels, from a flyash (2) laden combustion gas stream (4). The method includes a step of combusting a fuel (14), often coal or solid waste to form flyash, and a step to concentrate the interaction of the flyash (2) in the combustion gas stream (4) for use as a sorbent.
Claims4
A method for removing mercury from a gas stream exiting a coal fired combustion chamber, comprising the steps of:
- (a) introducing the gas stream into a recirculating cyclone;
- (b) removing particulate matter from the cyclone;
- and
- (c) reintroducing particulate matter removed from the cyclone into the gas stream, such that the particulate matter resides in the gas stream for a relatively increased period of time, at least a portion of the particulate matter bonding with mercury contained within the gas stream.
1 more element
Dependencies are inferred from the claim text.