초록 ▼

A method and system of regulating the air to fuel ratio supplied to a burner to maximize the combustion efficiency. Optical means are provided in close proximity to the burner for directing a beam of radiation from hot gases produced by the burner to a plurality of detectors. Detectors are provided

A method and system of regulating the air to fuel ratio supplied to a burner to maximize the combustion efficiency. Optical means are provided in close proximity to the burner for directing a beam of radiation from hot gases produced by the burner to a plurality of detectors. Detectors are provided for sensing the concentration of, inter alia, CO, CO2, and H2O. The differences between the ratios of CO to CO2 and H2O to CO are compared with a known control curve based on those ratios for air to fuel ratios ranging from 0.85 to 1.30. The fuel flow is adjusted until the difference between the ratios of CO to CO2 and H2O to CO fall on a desired set point on the control curve.

대표청구항 ▼

A method of regulating the air to fuel ratio supplied to a burner to maximize combustion efficiency comprising the steps of: (a) placing optical means in close proximity to the burner but downstream thereof for directing a beam of radiation from hot gases produced by said burner toward a plurality o

A method of regulating the air to fuel ratio supplied to a burner to maximize combustion efficiency comprising the steps of: (a) placing optical means in close proximity to the burner but downstream thereof for directing a beam of radiation from hot gases produced by said burner toward a plurality of detectors; (b) sensing with a first detector the intensity of the infrared radiation emitted from said hot gases in a first wavelength band to determine the concentration of a first constitutent in said hot gases; (c) sensing with a second detector the intensity of the infrared radiation emitted from said hot gases in a second wavelength band to determine the concentration of a second constituent in said hot gases; (d) sensing with a third detector the intensity of the infrared radiation emitted from said hot gases in a third wavelength band to determine the concentration of a third constituent in said hot gases; (e) computing as a first ratio the intensity of the first constituent to the intensity of the second constituent and computing as a second ratio the intensity of the third constituent with respect to the first constituent; (f) subtracting the second ratio from the first ratio; (g) comparing the result of step (e) with a known control curve representing the differences between said first and second ratios for stoichiometry values ranging from a fuel rich value of 0.85 to a fuel lean ratio of 1.30; and (h) adjusting the fuel flow to said burner until the difference between said ratios falls on a desired set point on said control curve.