F - Mech Eng,Light,Heat,Weapons – 23 – N
Patent
F - Mech Eng,Light,Heat,Weapons
23
N
122/27
F23N 1/02 (2006.01) F23N 5/00 (2006.01)
Patent
CA 1201947
TITLE COMBUSTION AIR TRIM CONTROL METHOD AND APPARATUS ABSTRACT OF THE DISCLOSURE Air trim control actuator mechanically connects a fuel flow device to an air flow device for setting the air to fuel ratio in combustion apparatus. An air to fuel ratio control unit is responsive to electrical input signals from an oxygen sensor that monitors the combustion products in the stack emissions. The air trim actuator includes a pivotally mounted input arm that is mechanic- ally connected to the control unit and is pivoted to a preselected position corresponding to the selected boiler load. The input arm is connected by a link to an output arm which is pivoted through a preselected range of movement to control the position of the damper. The output arm has an elongated arcuate slot for receiving the end of the link. The output arm is pivoted to a position corresponding to the pivoted position of the input arm for selectively positioning the damper to provide air flow to the boiler for the desired air/fuel ratio. Adjustments made to the boiler load automatically adjust the damper position for insuring that the proper air/fuel ratio is attained. The position of the link in the slot of the output arm is adjustable by a correction signal transmitted by the control unit to a motor, or the like, which moves the position of the second end of the link in the slot of the output arm. Thus, the range of movement of the output arm is adjustable in relation to the range of movement of the input arm. By adjusting the position of the end of the link in the slot in response to variations in the boiler load condition or other factors that effect the air/fuel ratio, the damper is automatically moved to continuously maintain the optimum combustion conditions.
420152
Ametek Inc.
Macrae & Co.
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