Continuously-variable control of pollution reducing chemicals for combustion sources
First Claim
1. A method for continuously and variably controlling the introduction of pollution reducing chemicals for reducing emissions from combustion sources, comprising providing a plurality of separately-controllable, solenoid-actuated, pulse-width modulated metering valve means comprised in supply nozzles at a plurality of locations within a defined space containing combustion gases including one or more pollutant species to be treated, monitoring combustion gas conditions by sensor means, which send an effluent characteristic signal representative of the conditions monitored to a controller, and within the controller, comparing the effluent characteristic signal to reference data and sending a control signal based on the comparison to one or more of the solenoid-actuated, pulse-width modulated metering valve means to control the introduction of pollution control chemical into the effluent.
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Accused Products
Abstract
A plurality of separately-controllable, supply nozzles incorporating pulse-width modulated, solenoid-actuated metering valves precisely controls the introduction of pollution control chemicals into the effluent of a combustor to provide improvements in pollution reduction and/or economy of operation despite the existence of widely variable combustor loads.
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Citations
17 Claims
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1. A method for continuously and variably controlling the introduction of pollution reducing chemicals for reducing emissions from combustion sources, comprising
providing a plurality of separately-controllable, solenoid-actuated, pulse-width modulated metering valve means comprised in supply nozzles at a plurality of locations within a defined space containing combustion gases including one or more pollutant species to be treated, monitoring combustion gas conditions by sensor means, which send an effluent characteristic signal representative of the conditions monitored to a controller, and within the controller, comparing the effluent characteristic signal to reference data and sending a control signal based on the comparison to one or more of the solenoid-actuated, pulse-width modulated metering valve means to control the introduction of pollution control chemical into the effluent.
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10. A method for continuously and variably controlling the introduction of pollution reducing chemicals for reducing emissions from combustion sources, comprising:
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providing a plurality of separately-controllable, separately-controllable, solenoid-actuated, pulse-width modulated metering valve means comprised in supply nozzles at a plurality of locations within a defined space containing combustion gases including one or more pollutant species to be treated, each of said valves comprising a pintle operated by a solenoid to open and close the valve means for designated time-defined pulses, the duration of which is provided by a controller;
continuously supplying pollution control chemical to the metering valve means comprised in the supply nozzles to constantly cool the metering valve means, with chemical which is not introduced into the combustion gases being returned to recovery means exterior to said metering valve means, continuously supplying gaseous carrier fluid to the supply nozzles to disperse the pollution control chemical supplied by the metering valve means and to control the temperature of the nozzles, monitoring conditions by sensor means, which send an effluent characteristic signal representative of the conditions monitored to a controller, and within the controller, comparing the effluent characteristic signal to reference data generated by computational fluid dynamics to predict NOx concentration data and pollution control chemical requirements and sending a control signal based on the comparison to one or more of the solenoid-actuated pulse-width modulated metering valve means to control the introduction of pollution control chemical into the effluent. - View Dependent Claims (11, 12)
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13. An apparatus for continuously and variably controlling the introduction of pollution reducing chemicals for reducing emissions from combustion sources, comprising:
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a plurality of separately-controllable, solenoid-actuated, pulse-width modulated metering valve means comprised in supply nozzles at a plurality of locations within a defined space containing combustion gases including one or more pollutant species to be treated, sensor means for monitoring conditions within the defined space and for sending an effluent characteristic signal representative of the conditions monitored to a controller, a controller for comparing the effluent characteristic signal to reference data and for sending a control signal based on the comparison to one or more of the solenoid-actuated, pulse-width modulated metering valve means to control the introduction of pollution control chemical into the effluent. - View Dependent Claims (14, 15, 16, 17)
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Specification