Spare selective catalytic reduction reactor system
AssigneeTechnology Sales & Marketing Corporation
InventorRam Ganeshan
Life of this patent
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Abstract
A system of selective catalytic reduction units for reducing nitrogen oxides by operating a plurality of parallel combustion units in parallel with a spare selective catalytic reduction reactor is disclosed. A primary selective catalytic reactor with spent catalyst is isolated for maintenance while the flue gas is diverted to the spare selective catalytic reduction reactor while continuing to discharge flue gas essentially free of nitrogen oxides from the spare selective catalytic reduction reactor. The spare selective catalytic reduction reactor can include a spare induced draft fan to provide an alternate means for operation and maintenance.
Claims13
A system of selective catalytic reduction units for reducing nitrogen oxides, comprising:
- a plurality of parallel combustion units producing NOx-containing flue gases that are passed serially in respective primary ducting from each respective combustion unit through a respective ammonia injection grid, primary selective catalytic reduction reactor, and primary fan;
- a spare selective catalytic reduction reactor ducted via secondary ducting in parallel with the primary selective catalytic reduction reactor for receiving flue gas diverted from one of the said primary selective catalytic reduction reactors while the said selective catalytic reduction reactor is out of service for maintenance;
- selectively operable flow diverters in the primary and secondary ducting for selectively isolating the primary and spare selective catalytic reduction reactors.
A method for continuously operating a plurality of parallel combustion units producing NOx-containing flue gases that are passed serially in respective primary ducting from each respective combustion unit through a respective ammonia injection grid, primary selective catalytic reduction reactor, and induced draft fan, comprising:
- installing a spare selective catalytic reduction reactor ducted via secondary ducting in parallel with the primary selective catalytic reduction reactor for receiving flue gas diverted from one of the said primary selective catalytic reduction reactors while the said selective catalytic reduction reactor is out of service for maintenance;
- selectively operating flow diverters in the primary and secondary ducting for selectively isolating one of said primary selective catalytic reduction reactors out of service for maintenance and diverting flue gas from the out-of-service primary selective catalytic reduction reactor to the spare selective catalytic reduction reactor.
A system of selective catalytic reduction units for reducing nitrogen oxides, comprising:
- a plurality of parallel combustion units producing NOx-containing flue gases that are passed serially in respective primary ducting from each respective combustion unit through a respective ammonia injection grid, primary selective catalytic reduction reactor, and induced draft fan;
- a spare selective catalytic reduction reactor ducted via secondary ducting in parallel with the primary selective catalytic reduction reactor for receiving flue gas diverted from one of the said primary selective catalytic reduction reactors while the said selective catalytic reduction reactor is out of service for maintenance;
- means for selectively isolating one of said primary selective catalytic reduction reactors out of service for maintenance and diverting flue gas from the out-of-service primary selective catalytic reduction reactor to the spare selective catalytic reduction reactor.
Dependencies are inferred from the claim text.