US-12624835-B2 - Inspection device

Abstract

To grasp a state of a combustion apparatus based on a flame state of a burner, a discharge number measurement unit measures the number of discharges of a flame sensor per unit time. A light emission information generation unit generates, as light emission information, information obtained based on a value obtained by dividing a total (accumulation) of the number of discharges per unit time measured by the discharge number measurement unit by a total measurement time. A determination unit determines the state of the combustion apparatus to be inspected based on the light emission information generated by the light emission information generation unit as described above.

Inventors

• Shigeki Ishii
• Kayo Suzuki
• Kenichi YAMAGATA

Assignees

• AZBIL CORPORATION

Dates

Publication Date

20260512

Application Date

20221215

Priority Date

20220121

Claims (16)

1. 1 . An inspection device comprising: a flame sensor configured to detect ultraviolet rays generated from a flame generated by a combustion apparatus; an application voltage generation unit configured to periodically apply a drive voltage to an electrode of the flame sensor; a discharge number measurement unit configured to measure the number of discharges of the flame sensor per unit time; a light emission information generation unit configured to generate, as light emission information, information obtained based on a value obtained by dividing a total of the number of discharges per unit time measured by the discharge number measurement unit by a total measurement time; and a determination unit configured to determine a state of the combustion apparatus based on the light emission information, wherein the determination unit is configured to determine the state of the combustion apparatus by using the light emission information generated by the light emission information generation unit as a reference at a normal time, using the light emission information generated by the light emission information generation unit as determination information at a time of determination, and comparing the reference with the determination information, the combustion apparatus includes a pilot burner and a main burner, and is configured to ignite the pilot burner, and thereafter ignite the main burner with a pilot flame of the ignited pilot burner, and the determination unit is configured to determine the state of the combustion apparatus based on a first comparison result obtained by comparing the reference with the determination information in a first period from start of ignition of the pilot burner to ignition of the main burner, and a second comparison result obtained by comparing the reference with the determination information in a second period after the main burner is ignited.
2. 2 . The inspection device according to claim 1 , wherein the determination unit is configured to determine the state of the combustion apparatus based on a third comparison result obtained by comparing an ignition time point of the pilot burner that is configured to be identified by the reference and an ignition time point of the pilot burner that is configured to be identified by the determination information in the first period from the start of the ignition of the pilot burner to the ignition of the main burner, in addition to the first comparison result and the second comparison result.
3. 3 . The inspection device according to claim 1 , wherein the determination unit is configured to determine the state of the combustion apparatus as being such that a flow rate or an air-fuel ratio of a fuel and air supplied to the pilot burner is deviated from a normal value in a case in which the first comparison result indicates that the determination information is smaller than the reference and the second comparison result indicates that the reference and the determination information are the same as each other.
4. 4 . The inspection device according to claim 1 , wherein the determination unit is configured to determine the state of the combustion apparatus as being such that a flow rate or an air-fuel ratio of a fuel and air supplied to the main burner is deviated from a normal value in a case in which the second comparison result indicates that the determination information is smaller than the reference and the first comparison result indicates that the reference and the determination information are the same as each other.
5. 5 . The inspection device according to claim 1 , wherein the determination unit is configured to determine the state of the combustion apparatus as being such that a flow rate or an air-fuel ratio of a fuel and air supplied to the main burner fluctuates in a case in which the first comparison result indicates that the reference and the determination information are the same as each other and the second comparison result fluctuates within the second period.
6. 6 . The inspection device according to claim 1 , wherein the determination unit is configured to determine the state of the combustion apparatus as being such that a flow rate or an air-fuel ratio of a fuel and air supplied to the pilot burner fluctuates in a case in which the second comparison result indicates that the reference and the determination information are the same as each other and the first comparison result fluctuates within the first period.
7. 7 . The inspection device according to claim 1 , wherein the determination unit is configured to determine the state of the combustion apparatus as being such that supply of air or supply of a fuel fluctuates in an unstable state in a case in which a magnitude relation between the reference and the determination information is alternately inverted in the first comparison result and a magnitude relation between the reference and the determination information is alternately inverted in the second comparison result.
8. 8 . The inspection device according to claim 1 , wherein the determination unit is configured to determine the state of the combustion apparatus as being such that a detection sensitivity of the flame sensor has decreased in a case in which the first comparison result indicates that the determination information is smaller than the reference and the second comparison result indicates that the determination information is smaller than the reference.
9. 9 . The inspection device according to claim 1 , wherein the determination unit is configured to determine the state of the combustion apparatus as being such that the number of suspected discharges caused by deterioration of the flame sensor has increased in a case in which the first comparison result indicates that the determination information is larger than the reference and the second comparison result indicates that the determination information is larger than the reference.
10. 10 . The inspection device according to claim 1 , wherein the light emission information generation unit is configured to generate, as the light emission information, a linear function expressed by a formula in which the total of the number of discharges per unit time measured by the discharge number measurement unit is divided by the total measurement time.
11. 11 . The inspection device according to claim 10 , wherein the determination unit is configured to determine the state of the combustion apparatus based on a third comparison result obtained by comparing an ignition time point of the pilot burner that is configured to be identified by the reference and an ignition time point of the pilot burner that is configured to be identified by the determination information in the first period from the start of the ignition of the pilot burner to the ignition of the main burner, in addition to the first comparison result and the second comparison result.
12. 12 . The inspection device according to claim 10 , wherein the determination unit is configured to determine the state of the combustion apparatus as being such that a flow rate or an air-fuel ratio of a fuel and air supplied to the pilot burner is deviated from a normal value in a case in which the first comparison result indicates that the determination information is smaller than the reference and the second comparison result indicates that the reference and the determination information are the same as each other.
13. 13 . The inspection device according to claim 10 , wherein the determination unit is configured to determine the state of the combustion apparatus as being such that a flow rate or an air-fuel ratio of a fuel and air supplied to the main burner is deviated from a normal value in a case in which the second comparison result indicates that the determination information is smaller than the reference and the first comparison result indicates that the reference and the determination information are the same as each other.
14. 14 . The inspection device according to claim 10 , wherein the determination unit is configured to determine the state of the combustion apparatus as being such that a flow rate or an air-fuel ratio of a fuel and air supplied to the main burner fluctuates in a case in which the first comparison result indicates that the reference and the determination information are the same as each other and the second comparison result fluctuates within the second period.
15. 15 . The inspection device according to claim 10 , wherein the determination unit is configured to determine the state of the combustion apparatus as being such that a flow rate or an air-fuel ratio of a fuel and air supplied to the pilot burner fluctuates in a case in which the second comparison result indicates that the reference and the determination information are the same as each other and the first comparison result fluctuates within the first period.
16. 16 . The inspection device according to claim 10 , wherein the determination unit is configured to determine the state of the combustion apparatus as being such that supply of air or supply of a fuel fluctuates in an unstable state in a case in which a magnitude relation between the reference and the determination information is alternately inverted in the first comparison result and a magnitude relation between the reference and the determination information is alternately inverted in the second comparison result.

Description

CROSS REFERENCE TO RELATED APPLICATIONS This patent application claims the benefit of foreign priority to Japanese Patent Application No. JP 2022-007699 filed on Jan. 21, 2022, the disclosure of which is herein incorporated by reference in its entirety. BACKGROUND OF THE INVENTION The present disclosure relates to an inspection device that determines a state of a combustion apparatus. In a combustion apparatus such as a combustion furnace, a drying furnace, and a boiler, a flame sensor that detects the presence or absence of a flame is used to control combustion in a combustion chamber. In general, an ultraviolet ray detection tube or the like is used as the flame sensor. The ultraviolet ray detection tube is a discharge tube in which, in a state in which a high voltage is applied between a pair of electrodes provided in a tube made of glass, discharge occurs between the electrodes when ultraviolet rays radiated from a flame are incident. A discharge current is obtained from the ultraviolet ray detection tube when the ultraviolet rays radiated from the flame are detected. A flame voltage obtained by integrating the discharge current and converting the discharge current into a voltage output is used for ignition control of a burner or the like (see PTL 1). Incidentally, because a voltage to be applied to the flame sensor (ultraviolet ray detection tube) is generated from a commercial power supply voltage, a discharge current may also increase or decrease depending on a magnitude of a level of the power supply voltage and may not always be the same flame voltage. In order to eliminate an influence of fluctuation of the power supply voltage, a technique using a discharge probability calculated based on the number of times of application of a drive voltage to the flame sensor and the number of times of discharge from the flame sensor detected during the application of the drive voltage has been proposed (see PTL 2). The technique determines an ultraviolet ray intensity level based on the discharge probability. CITATION LIST Patent Literature [PTL 1] JP-A-2017-138018 [PTL 2] JP-A-2020-165830 BRIEF SUMMARY OF THE INVENTION However, in the above-described related art, there is a problem that it is not easy to grasp a state of the combustion apparatus, such as what kind of abnormality occurred in the combustion apparatus, based on a flame state of the burner. The present disclosure is made to solve the above-described problem, and an object of the present disclosure is to make it possible to grasp a state of a combustion apparatus based on a flame state of a burner. An inspection device according to the present disclosure includes: a flame sensor configured to detect ultraviolet rays generated from a flame generated by a combustion apparatus; an application voltage generation unit configured to periodically apply a drive voltage to an electrode of the flame sensor; a discharge number measurement unit configured to measure the number of discharges of the flame sensor per unit time; a light emission information generation unit configured to generate, as light emission information, information obtained based on a value obtained by dividing a total of the number of discharges per unit time measured by the discharge number measurement unit by a total measurement time; and a determination unit configured to determine a state of the combustion apparatus based on the light Emission information. In the inspection device cording to one configuration example, the light emission information generation unit is configured to generate, as the light emission information, a linear function expressed by a formula in which the total of the number of discharges per unit time measured by the discharge number measurement unit is divided by the total measurement time. In the inspection device according to one configuration example, the determination unit is configured to determine the state of the combustion apparatus by using the light emission information generated by the light emission information generation unit as a reference at a normal time, using the light emission information generated by the light emission information generation unit as determination information at a time of determination, and comparing the reference with the determination information. In the inspection device according to one configuration example, the combustion apparatus includes a pilot burner and a main burner, ignites the pilot burner, and thereafter ignites the main burner with a pilot flame of the ignited pilot burner, and the determination unit is configured to determine the state of the combustion apparatus based on a first comparison result obtained by comparing the reference with the determination information in a first period from start of ignition of the pilot burner to ignition of the main burner, and a second comparison result obtained by comparing the reference with the determination information in a second period after the main burner is ignit