Flame detection system and flame level detection method

Patent metadata

Field	Value
Publication number	US-11215362-B2
Application number	US-202016825706-A
Country	US
Kind code	B2
Filing date	Mar 20, 2020
Priority date	Mar 29, 2019
Publication date	Jan 4, 2022
Grant date	Jan 4, 2022

Abstract

A flame detection system includes: a UV sensor that serves as a flame sensor detecting a UV ray generated by a flame; an application voltage generation unit that applies a driving voltage to the UV sensor; a discharge detection unit that detects a discharge in the UV sensor; a discharge count unit that counts the number of detected discharges; a discharge probability calculation unit that calculates a discharge probability on the basis of the number of discharges counted by the discharge count unit and the number of times the driving voltage is applied; a UV intensity determination unit that determines an intensity of the UV ray on the basis of the discharge probability; and a determination result output unit that outputs the intensity of the UV ray determined by the UV intensity determination unit via display or communication.

First claim

What is claimed is:

1. A flame detection system, comprising:
a flame sensor configured to detect a UV ray generated by a flame;
an application voltage generation circuit configured to cyclically apply a driving voltage to electrodes of the flame sensor;
a discharge detection circuit configured to detect a discharge in the flame sensor; and
processing circuitry configured to
count a number of discharges detected by the discharge detection circuit,
calculate a discharge probability based on a number of times the driving voltage is applied and the counted number of discharges, and
determine an intensity level of the UV ray based on the calculated discharge probability.

2. The flame detection system according to claim 1 , wherein the processing circuitry is further configured to calculate the discharge probability by dividing the counted number of discharges by the number of times the driving voltage is applied.

3. The flame detection system according to claim 1 , wherein the processing circuitry is further configured to determine a number of discharges per unit time as the discharge probability.

4. The flame detection system according to claim 1 , wherein the processing circuitry is further configured to output the determined intensity level of the UV ray.

5. The flame detection system of claim 1 , wherein the discharge detection circuit includes a light emitting diode and a phototransistor.

6. A flame level detection method for a flame detection system, the method comprising:
cyclically applying a driving voltage to electrodes of a flame sensor configured to detect a UV ray generated by a flame;
detecting a discharge in the flame sensor;
calculating a discharge probability based on a number of times the driving voltage is applied and a number of discharges detected in the detecting step; and
determining an intensity level of the UV ray based on the discharge probability.

7. The flame level detection method for a flame detection system according to claim 6 , wherein the calculating step includes calculating the discharge probability by dividing the number of discharges by the number of times the driving voltage is applied.

8. The flame level detection method for a flame detection system according to claim 6 , wherein the calculating step includes determining a number of discharges per unit time as the discharge probability.

9. The flame level detection method for a flame detection system according to claim 6 , the method further comprising outputting the intensity level of the UV ray determined in the determining step.

Assignees

• Azbil Corp

Inventors

• Watanabe Takashi
• Ishii Shigeki
• Kumazawa Yuichi
• Suzuki Kayo
• Yamagishi Satoru

Classifications

• G01J5/0018

  Flames, plasma or welding · CPC title

• H01J40/00

  Photoelectric discharge tubes not involving the ionisation of a gas (H01J49/00 takes precedence) · CPC title

• F23N5/082 Primary

  using electronic means · CPC title

• G01J1/429

  applied to measurement of ultraviolet light (using counting tubes G01T) · CPC title

• F23M11/045 Primary

  by observing the flame · CPC title