초록 ▼

Combustion facilities includes a combustion apparatus having a burner, a fuel control valve disposed along a fuel feeding pipe, a air control valve disposed along an air feeding pipe. An optical sensor detects radiated light originating in combustion flame of the burner, and converts it into a first

Combustion facilities includes a combustion apparatus having a burner, a fuel control valve disposed along a fuel feeding pipe, a air control valve disposed along an air feeding pipe. An optical sensor detects radiated light originating in combustion flame of the burner, and converts it into a first electric signal. The first electric signal is a composite signal consisting essentially of an intensity signal element reflective of the intensity of the detected light and an oscillation signal element reflective of fluctuation of the turbulent combustion flame caused by the air feeding to the burner. A sensor amplifier, which is connected to the optical sensor, extracts both the oscillation signal element and an intensity factor representative of a real intensity of the radiated light originated in only the combustion flame, from the first electric signal, and generates a second electric signal by dividing the oscillation signal element by the intensity factor. A combustion controller, which is connected to the sensor amplifier, applies frequency analysis to the second signal, and calculates “Oscillation Power”based on the result of the frequency analysis. The oscillation power is closely related to the excess air ratio to be controlled. The combustion controller controls the air control valve based on the oscillation power, separated from the fuel control valve.

대표청구항 ▼

A method for controlling combustion condition in a combustion facility, the combustion facility including a combustion apparatus having a burner, a fuel feeding pipe connected to the burner and having a fuel control valve for controlling the feeding of fuel, an air feeding pipe connected to the burn

A method for controlling combustion condition in a combustion facility, the combustion facility including a combustion apparatus having a burner, a fuel feeding pipe connected to the burner and having a fuel control valve for controlling the feeding of fuel, an air feeding pipe connected to the burner and having an air control valve for controlling the feeding of air; a detection device for detecting radiated light originating in a combustion flame of the burner, and a combustion controller for controlling an open position of the air control valve based on detection data from the detection device, the method comprising the steps of: A) converting the radiated light detected by the detection device into a first electric signal, wherein said first electric signal includes an intensity signal element corresponding to the intensity of the detected light and an oscillation signal element corresponding to fluctuations of the combustion flame caused by the feeding of air to the burner; B) extracting said oscillation signal element from said first electric signal; C) extracting an intensity factor, representative of a real intensity of the radiated light originating in only the combustion flame, from said first electric signal; D) generating a second electric signal by dividing said oscillation signal element by said intensity factor, so as to compensate said oscillation signal element which is influenced by the intensity of radiated light; E) applying frequency analysis to said second electric signal; F) calculating an oscillation power based on the result of the frequency analysis, wherein said oscillation power is related to the state of the combustion flame; and G) performing feedback-control of the open position of the air control valve, in such a manner that said calculated oscillation power approaches a predetermined optimum oscillation power.