Exhaust recirculating method and apparatus for a hydrocarbon fired burner
First Claim
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1. A system for a hydrocarbon fired burner comprising:
- an exhaust conduit in fluid communication with the burner;
a recirculation conduit configured to provide, fluid communication between the exhaust conduit and burner inlet;
an adjustable valve configured to selectively permit the recirculation conduit to provide fluid communication between the exhaust conduit and the burner inlet;
a NOx sensor located in the exhaust conduit;
a system controller operably connected to the NOx sensor and configured to monitor an amount of NOx emissions in the exhaust conduit, the system controller also operably connected to the valve to adjust the valve; and
a burner controller operably connected to the system controller, wherein the system controller sends a signal to the burner controller to shut down the burner when the NOx emissions in the exhaust conduit are at a first unacceptable level.
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Abstract
A system and method for reducing NOx emissions in a hydrocarbon fired burned is provided. The method and apparatus selectively recirculate exhaust gases from the burner into the burner inlet gases to achieve a desired NOx output.
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Citations
20 Claims
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1. A system for a hydrocarbon fired burner comprising:
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an exhaust conduit in fluid communication with the burner;
a recirculation conduit configured to provide, fluid communication between the exhaust conduit and burner inlet;
an adjustable valve configured to selectively permit the recirculation conduit to provide fluid communication between the exhaust conduit and the burner inlet;
a NOx sensor located in the exhaust conduit;
a system controller operably connected to the NOx sensor and configured to monitor an amount of NOx emissions in the exhaust conduit, the system controller also operably connected to the valve to adjust the valve; and
a burner controller operably connected to the system controller, wherein the system controller sends a signal to the burner controller to shut down the burner when the NOx emissions in the exhaust conduit are at a first unacceptable level. - View Dependent Claims (2, 3, 5, 6, 7, 8, 9)
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4. (canceled).
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10. A system for a hydrocarbon fired burner comprising:
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means for exhausting combustion gases in fluid communication with the burner;
means for recirculating combustion gases from the exhausting means with the burner;
means for selectively permitting the recirculation means to provide fluid communication between the exhausting mean and the burner;
means for sensing NOx located in the exhausting means;
means for controlling the system operably connected to the NOx sensing means and configured to monitor an amount of NOx emissions in the exhausting means, the controlling means also operably connected to control the permitting means; and
a data storing means operably connected to the system controlling means, wherein the system controlling means sends NOx information received from the NOx sensing means to the data storing means. - View Dependent Claims (11, 13, 14, 15, 16, 17)
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12. (canceled).
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18. A method of reducing NOx emissions in an appliance having a burner comprising:
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detecting NOx emissions in exhaust associated with the burner;
determining if a recirculation valve should be one of;
opened, closed, and remain the same according to predetermined criteria; and
performing one of adjusting the valve and leaving the valve in a current position in accordance with the result of the determining step. - View Dependent Claims (19, 20)
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Specification