Combustion – Timer – programmer – retarder or condition responsive control – By condition of burner feed or feed means
Patent
1994-11-30
1997-06-03
Price, Carl D.
Combustion
Timer, programmer, retarder or condition responsive control
By condition of burner feed or feed means
431 12, F23N 518
Patent
active
056347863
ABSTRACT:
An integrated fuel-to-air control system is disclosed in which fuel and air pressure differential sensors are provided for measuring the flow pressure differential of fuel and air across orifices in the respective flow paths. The pressure differential sensors generate signals which are characteristic of the pressure differentials across the orifices.
A control system is provided which includes an electronic comparator for receiving the pressure differential signals and generating a difference signal corresponding to the difference between these signals. The difference signal in turn is transmitted to a valve actuator which respectively opens or closes a valve in the fuel flow path in order to vary the fuel flow pressure differential so as to achieve a desired fuel-to-air ratio with the oxidant flow pressure differential. The fuel flow pressure is varied up or down as necessary until the difference signal reaches zero at the desired ratio.
The present invention may include a temperature sensor which communicates a temperature signal for pre-heated air to the control system. The control system responds to the temperature signal by compensating the fuel flow to correspond to temperature-related changes in air density which affect the fuel-to-air ratio. The present invention also includes means for decreasing the fuel flow automatically so as to create an excess of air for air pressures below the excess air breakpoint.
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North American Manufacturing Company
Price Carl D.
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