F - Mech Eng,Light,Heat,Weapons – 23 – N
Patent
F - Mech Eng,Light,Heat,Weapons
23
N
341/19
F23N 5/00 (2006.01) F23N 1/02 (2006.01) F23N 1/10 (2006.01)
Patent
CA 1171937
ABSTRACT OF THE DISCLOSURE A novel combustion control apparatus is herein provided for efficient control of combustion in a process heater with a minimum of components. The apparatus includes a signal generating device for gene- rating a signal from a condition of a process, e.g. temperature, or pressure in the case of a boiler. The signal generating device is coupled in para- llel to a resistance, a first electro-responsive device, and a second electro-responsive device. The first electro-responsive device is adapted to be responsive to a signal of a first characterization. The second elec- tro-responsive device is adapted to be responsive to a signal of a second characterization. The resistance is coupled to a first plate of a capaci- tance, the capacitance being adaptable to provide the signal of a first characterization and the signal of a second characterization. A second plate of the capacitance is coupled in a parallel to the first electro- responsive device and to the second electro-responsive device. The first electro-responsive device is further coupled to an air control device adap- table to control a flow of combustion air in response to a signal from the first electro-responsive device. The second electro-responsive device is further coupled to a fuel control device adaptable to control a flow of fuel in response to a signal from the second electro-responsive device. The electro-responsive devices adjust the flow of fuel and combustion air. The outputs are controlled so as always to provide a fuel-lean mixture during a change in the operating conditions of the process. As the input signal increases, the fuel rate slowly increases and the air rate slowly decreases. In the case where the input signal is decreased, the fuel sig- nal is immediately decreased and the air signal is slowly decreased.
395308
Borden Ladner Gervais Llp
Broach (g.c.) Company (the)
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