Combustion – Timer – programmer – retarder or condition responsive control – By combustion or combustion zone sensor
Patent
1981-07-27
1983-12-20
Scott, Samuel
Combustion
Timer, programmer, retarder or condition responsive control
By combustion or combustion zone sensor
431 89, 236 15BD, 236 15E, 137100, 137487, F23N 500
Patent
active
044214731
ABSTRACT:
A system for marginally adjusting the fuel flow to a burner to maintain the proper oxygen content in the exhaust from the burner is disclosed. The burner is of the type where both the fuel and air flow rates are adjusted in a substantially fixed ratio in response to load changes on the system with the fuel being adjusted by a fuel control valve mounted in a fuel supply line. A self-operating pressure regulating valve having an actuator responsive to the differential pressure across the fuel control valve is mounted in the fuel line upstream of the fuel control valve. A set point adjustment mechanism is mounted on the regulating valve actuator to adjust the set point of the regulating valve in response to an oxygen controller which senses the oxygen content in the stack gases. The set point adjustment mechanism has a cam assembly which continously adjusts the set point of the regulator actuator by varying the compression on a spring loaded diaphragm therein. A positioner is interposed between the oxygen controller and the set point adjustment mechanism to provide the necessary mechanical input to the set point adjustment mechanism.
REFERENCES:
patent: 4113418 (1978-09-01), Larcen
patent: 4249886 (1981-02-01), Bush
patent: 4264297 (1981-04-01), Van Berkum
Coen Company, Inc.
Focarino Margaret A.
Scott Samuel
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