JP5017249B2 - Incomplete combustion detector - Google Patents

Description

  The present invention relates to an incomplete combustion detection device for detecting incomplete combustion in a heating apparatus that accommodates a burner group and a heat exchanger in a combustion chamber, and particularly enables detection of partial incombustibility.

  As shown in FIG. 3, a gas water heater 100 as a heating device includes a gas burner 2 and a heat exchanger 3 disposed in a combustion chamber 11, and a controller 5 burns fuel gas with the gas burner 2 to exchange heat. Water heater operation control for heat exchange heating of the water in the vessel 3 is performed. For example, an open type gas water heater 100 installed in a room of a home kitchen or the like performs supply / exhaust of burner combustion indoors. Therefore, this type of gas water heater 100 includes incomplete combustion of the gas burner 2. Incomplete combustion detection devices are often provided that detect water and stop boiling water operation.

  In the incomplete combustion detection device, the first thermocouple TC1 installed facing the flame outlet of the gas burner 2 detects the temperature of the flame formed in the flame outlet, and the combustion chamber between the gas burner 2 and the heat exchanger 3 The second thermocouple TC2 installed facing the opening 10 of the constituent wall detects the ambient temperature of the opening 10 and the electromotive force difference (temperature difference signal) between the first thermocouple TC1 and the second thermocouple TC2. The incomplete combustion is detected based on ΔV1. In other words, when incomplete combustion occurs due to lack of oxygen in the room, a lift phenomenon occurs in which the flame rises from the flame outlet, so the temperature at the first thermocouple TC1 that detects the flame temperature at the flame mouth decreases (electromotive force decreases). However, the atmospheric temperature of the combustion chamber constituting wall opening 10 detected by the second thermocouple TC2 remains almost unchanged. Therefore, in this case, incomplete combustion is detected because the electromotive force difference ΔV1 between the first thermocouple TC1 and the second thermocouple TC2 becomes small and the threshold A for non-combustibility determination is interrupted. Further, if incomplete combustion occurs due to clogging of the fins 32 of the heat exchanger 3, the combustion exhaust gas is not guided well from the heat exchanger 3 toward the exhaust port 14, and leaks from the combustion chamber constituting wall opening 10. Although the temperature at the second thermocouple TC2 that detects the ambient temperature of the constituent wall opening 10 increases (the electromotive force increases), the flame temperature detected by the first thermocouple TC1 remains almost unchanged. Therefore, also in this case, since the electromotive force difference ΔV1 between the first thermocouple TC1 and the second thermocouple TC2 becomes small and the threshold value A for incombustibility determination is interrupted, incomplete combustion is detected.

On the other hand, when a plurality of the second thermocouples TC2 are distributed on the combustion chamber wall and at least one of the temperature signals of each of the second thermocouples TC2 exceeds a predetermined threshold b for partial non-combustion determination A device that detects incomplete combustion (Patent Document 1), a plurality of the second thermocouples TC2 are distributed on the combustion chamber wall, and each of the temperature signals of the second thermocouples TC2. There is one that detects incomplete combustion when at least one of the temperature difference signals (electromotive force difference) with respect to the temperature signal of TC1 exceeds a predetermined threshold b for partial incombustibility determination (Patent Document 2). According to these, when local incomplete combustion (partial non-combustion) occurs due to local primary air clogging or local heat exchanger clogging, the combustion chamber 11 near the clogged portion of the heat exchanger due to the increase in the internal pressure of the combustion chamber 11 Since combustion exhaust flows out from the constituent wall opening, the outflow of this combustion exhaust is captured by the second thermocouples TC2... Arranged at the combustion chamber constituent wall opening to detect the occurrence of incomplete combustion. . Therefore, in these patent documents 1 and patent documents 2, partial incombustibility can also be detected and safety can be improved.
JP 7-49119 A Japanese Patent Laid-Open No. 7-49120

  However, those disclosed in Patent Document 1 and Patent Document 2 have the same threshold width for each of the second thermocouples TC2... In order to detect the partial incombustibility that can occur in various places with the same aim. Thus, it is necessary to set the threshold value b for determining the partial incombustibility. However, since each of the second thermocouples TC2... Has a variation in detection characteristics, the threshold value b is set to each of the second thermocouples TC2... So that the degree of partial incombustibility can be detected with the same aim. It is very difficult to set according to the specifications. Even if a threshold value can be set according to the specifications of each second thermocouple TC2..., It is a part for each second thermocouple TC2... Due to variations in the specifications of the gas water heater 100 as a heating device. Incombustibility may be detected at different levels.

  The present invention has been made in view of the above circumstances, and it is an object of the present invention to provide an incomplete combustion detection device in which a threshold value for detecting occurrence of partial incombustibility is simple and variation in detection of partial incombustibility is suppressed. And

The incomplete combustion detection device according to the present invention is
An incomplete combustion detection device for detecting incomplete combustion in a heating device that houses a burner group and a heat exchanger in a combustion chamber,
Facing the first opening of the combustion chamber constituting wall between the first temperature sensor for detecting the temperature of the flame formed at the flame outlet and facing the flame outlet of the burner group, and the heat exchanger When the incomplete combustion of the burner group is detected based on the second temperature sensor that is installed and detects the ambient temperature of the first opening, and the temperature signals of the first temperature sensor and the second temperature sensor, the burner group And a controller for stopping the combustion of
A third temperature sensor that detects the ambient temperature of the second opening by being installed on the combustion chamber constituting wall between the burner group and the heat exchanger in hopes of the second opening away from the second temperature sensor;
A partial incombustibility detecting means for outputting a partial incombustibility signal indicating the occurrence of local incomplete combustion when a temperature difference signal between the second temperature sensor and the third temperature sensor exceeds a threshold value of partial incombustibility determination; is there.

  When the heat exchanger is partially clogged and local incomplete combustion (partial incombustibility) occurs, the combustion chamber constituting wall opening (the first opening or the second opening) near the heat exchanger clogged portion is increased due to an increase in the combustion chamber pressure. Combustion exhaust flows out from the (2 openings), and the outflow of this combustion exhaust is regarded as an increase in temperature detected by the second temperature sensor or the third temperature sensor disposed in the opening. On the other hand, since the combustion exhaust gas does not flow out from the opening (the first opening or the second opening) of the combustion chamber constituting wall near the portion where the heat exchanger is not clogged, the second temperature arranged at the opening The detected temperature of the sensor or the third temperature sensor is hardly changed. Therefore, if the temperature difference signal between the second temperature sensor and the third temperature sensor exceeds the threshold value for determining the partial incombustibility as the temperature detected by the second temperature sensor or the third temperature sensor increases by the partial incombustibility detection means, It is determined that the balance is bad, that is, the partial incombustibility has occurred, and a partial incombustibility signal is output.

As described above, since the occurrence of partial incombustibility is detected by the temperature difference signal between the second temperature sensor and the third temperature sensor, a threshold value for determining the partial incombustibility for detecting the occurrence of partial incombustibility is newly provided. What is necessary is just to set according to a detection characteristic. Therefore, the above threshold setting for detecting the occurrence of partial incombustibility is simplified. In addition, since the occurrence of partial incombustibility is detected by the temperature difference signal between the second temperature sensor and the third temperature sensor, the degree of occurrence of partial incombustibility at each location can be detected with substantially the same aim.
Note that overall incomplete combustion can be detected based on temperature signals from the first temperature sensor and the second temperature sensor.

The partial incombustibility detecting means is configured to output the partial incombustibility signal when a state in which a temperature difference signal between the second temperature sensor and the third temperature sensor exceeds the threshold value continues for a certain period of time. desirable.
If the temperature difference signal between the second temperature sensor and the third temperature sensor exceeds the threshold value for determining the partial incombustibility, immediately after the partial incombustibility is detected, a single partial incombustibility due to a disturbance such as wind blowing is detected. Although there is a possibility, according to the above configuration, it is possible to prevent a single partial non-combustion detection without any actual damage due to such disturbance.

  As described above, the incomplete combustion detection device according to the present invention can detect not only the entire incomplete combustion but also the partial incombustibility in the heating device. In this case, the threshold setting for detecting the occurrence of partial incombustibility is simple, and variations in the degree of detection of the occurrence of partial incombustibility are suppressed. Therefore, the safety against incomplete combustion of the heating device can be further improved.

Hereinafter, as an embodiment of the present invention, a gas water heater serving as a heating device will be described as an example.
A gas water heater 1 shown in FIG. 1 is an open type gas water heater 1 installed in a home kitchen or the like, and the gas water heater 1 detects incomplete combustion in the burner group 2. A detection device is provided. In the gas water heater 1, a combustion chamber 11 that houses the burner group 2 and the heat exchanger 3 is disposed in an outer case 10.

  The combustion chamber 11 is a rectangular cylindrical body that opens up and down. The heat exchanger 3 is accommodated on the upper exhaust side, and the burner group 2 is disposed on the lower intake side. The upper open portion of the combustion chamber 11 is connected to the exhaust port 14. In addition, a first opening portion 12 and a second opening portion 13 are provided in the constituent walls of the combustion chamber 11, and the first thermocouple TC2 and the third thermocouple TC2 are provided in the first opening portion 12 and the second opening portion 13, respectively. A thermocouple TC3 is provided.

  The burner group 2 generates combustion exhaust by burning a mixed gas of fuel gas and air, and is configured by arranging a plurality of unit burners in parallel. A gas supply pipe 21 that supplies fuel gas is connected to the burner group 2. The gas supply pipe 21 is provided with an electromagnetic on-off valve 22, a water pressure responsive valve 23, a governor valve 24, and a gas amount adjusting valve 25 in order from the upstream side. The gas amount adjustment valve 25 is connected to the temperature adjustment knob 4 and adjusts the flow rate of the fuel gas supplied to the burner group 2 according to the movement of the temperature adjustment knob 4. In the burner group 2, a spark plug 26 and a first thermocouple TC1 are disposed at a position facing the flame outlet.

  The heat exchanger 3 has a meandering endothermic tube 31 and a plurality of fins 32 arranged to intersect the endothermic tube 31. The heat absorption pipe 31 has a water supply pipe 33 connected to the inlet side and a hot water discharge pipe 34 connected to the outlet side. The water supply pipe 33 is provided with an electric valve 36, a water governor valve 37, and a water amount adjustment valve 38 in order from the upstream side. The water amount adjustment valve 38 is connected to the temperature adjustment knob 4 and adjusts the amount of water supplied to the heat exchanger 3 according to the movement of the temperature adjustment knob 4. A hot water discharge head 35 capable of switching the hot water between a shower and a straight is provided at the end of the hot water discharge pipe 34.

  The gas water heater 1 is provided with a control unit 5 that controls the operation of the gas water heater 1. The control unit 5 combusts the burner group 2 and performs an operation control means 51 for performing a water boiling operation for heating water supplied from the water supply pipe 33 through the heat exchanger 3 to the hot water discharge pipe 34, And non-combustion detecting means 52 for detecting complete combustion. The control unit 5 is connected to a notification unit 6, an operation switch 7, and the like.

  The operation control means 51 opens the motor-operated valve 36 fully when the operation switch 7 is turned on by the user's operation when the water heater operation is stopped (the motor-operated valve 36 is closed and the burner group 2 is extinguished). To. Then, water is supplied from the water supply to the water supply pipe 33, the water pressure responsive valve 23 is opened, and the water flow switch 35 is turned on. Then, when the operation control means 51 detects the start of water supply to the water supply pipe 33, it applies a high voltage to the igniter 27 to cause the spark plug 26 to spark discharge, and opens the electromagnetic on-off valve 22 to open the burner group 2. Ignition processing is performed. Thereby, the water heating operation is started.

  The operation control means 51 detects the ignition of the burner group 2 based on the electromotive force VT1 of the first thermocouple TC1, and thereafter, the non-combustion detection means 52 causes the first thermocouple TC1, the second thermocouple TC2, and the third thermocouple. When the combustion state of the burner group 2 is monitored based on the electromotive forces VT1, VT2, and VT3 of the pair TC3 and misfire or combustion abnormality of the burner group 2 is detected, the operation control means 51 closes the electromagnetic on-off valve 22.

  The gas water heater 1 sucks room air from the air supply port 15 on the side of the outer case 10 by hot water operation, and generates combustion exhaust in the burner group 2, and this combustion exhaust moves upward in the combustion chamber 11. It moves and passes through the heat exchanger 3 and is discharged into the room from the exhaust port 14 at the top of the outer case 10. During this time, while the water supplied from the water supply pipe 33 by the heat exchanger 3 passes through the heat absorption pipe 31, it is heat exchange heated by the heat of the combustion exhaust gas and is sent to the hot water discharge pipe 34 as hot water. Hot water is discharged from the hot water outlet head 35.

  On the other hand, when the operation switch 7 is turned off by the user's operation during the water heating operation, the operation control means 51 closes the electromagnetic on-off valve 22 to extinguish the burner group 2 and closes the motor operated valve 36 to perform the water heating operation. Terminate.

Next, the incomplete combustion detection device provided in the gas water heater 1 will be described.
The incomplete combustion detection device includes a first thermocouple (first temperature sensor) TC1 installed in the burner group 2 and a second thermocouple (second temperature sensor) installed in the first opening 12 of the constituent wall of the combustion chamber 11. ) TC2, a third thermocouple (third temperature sensor) TC3 installed in the second opening 13 of the constituent wall of the combustion chamber 11, and a non-combustion detection means 52 (including a partial non-combustion detection means) provided in the control unit 5 ).

  The first thermocouple TC <b> 1 is disposed with the heat-sensitive part Q <b> 1 at the tip facing the flame outlet of the burner group 2, and detects the temperature of the flame formed at the flame outlet. The first opening 12 and the second opening 13 are rectangular between the burner group 2 and the heat exchanger 3 in the structural wall on the front side of the combustion chamber 11 and at a predetermined distance in the left and right positions near the heat exchanger 3. It is formed through. And 2nd thermocouple TC2 is arrange | positioned with the heat sensitive part Q2 of the front facing the 1st opening part 12, and detects the atmospheric temperature of this 1st opening part 12. FIG. The third thermocouple TC <b> 3 is arranged with the heat-sensitive part Q <b> 3 at the front end facing the second opening 13, and detects the ambient temperature of the second opening 13. The first thermocouple TC1, the second thermocouple TC2, and the third thermocouple TC3 generate electromotive forces VT1, VT2, and VT3 corresponding to the temperatures received by the thermosensitive portions Q1, Q2, and Q3. These electromotive force values VT1, VT2, and VT3 are input to the control unit 5. The first thermocouple TC1 and the second thermocouple TC2 are mainly used for detecting the overall incomplete combustion of the burner group 2, and the third thermocouple TC3 is mainly used for detecting the locality of the burner group 2. Used to detect incomplete combustion (partial incombustibility).

  When the electromotive force difference ΔV1 (temperature difference signal) between the first thermocouple TC1 and the second thermocouple TC2 exceeds the nonflammability determination threshold A (first threshold), the incombustible detection means 52 performs overall incomplete combustion. Judge that it occurred. Further, the non-combustion detecting means 52 causes partial non-combustion when the electromotive force difference ΔV2 (temperature difference signal) between the second thermocouple TC2 and the third thermocouple TC3 exceeds the threshold B (second threshold) for partial non-combustion determination. (Functions as a partial incombustibility detection means). When the non-combustion detecting means 52 determines that overall incomplete combustion or local incomplete combustion has occurred, it outputs a signal indicating incomplete combustion to the operation control means 51, and the operation control means 51 supplies the gas. The motorized valve 36 of the pipe 21 is closed, and all the burner groups 2 are extinguished. Further, the non-combustion detecting means 52 outputs a signal indicating that incomplete combustion has occurred to the notifying means 6, and notifies the user that the incomplete combustion has occurred, thereby informing the user of the gas water heater. Encourage the suspension of use, inspection, repair or replacement.

Next, the operation of incomplete combustion detection by the incomplete combustion detection device will be described.
When combustion of the burner group 2 is started by the operation control means 51, the non-combustion detection means 52 detects overall incomplete combustion (non-combustion) and local incomplete combustion (partial incombustibility).
In order to detect the entire incomplete combustion, the electromotive force difference ΔV1 between the electromotive force VT1 output from the first thermocouple TC1 and the electromotive force VT2 output from the second thermocouple TC2 is set to the nonflammability determination threshold A. To be compared. Here, as the overall incomplete combustion, when the indoor ventilation is insufficient and the oxygen concentration in the combustion chamber 11 is reduced, or due to dust clogging of the throat portion of the burner group 2 due to long-term use, the entire burner group 2 When the primary air becomes insufficient, a lift phenomenon occurs in which the flame of the burner group 2 rises from the flame opening. Then, the high temperature part of the flame is separated from the heat sensitive part Q1 of the first thermocouple TC1, and the surface temperature of the heat sensitive part Q1 of the first thermocouple TC1 is lower than that at the time of complete combustion. As a result, from the first thermocouple TC1 The electromotive force value VT1 becomes lower. On the other hand, since the atmospheric temperature at the first opening 12 of the combustion chamber constituting wall hardly changes, the electromotive force value VT2 from the second thermocouple TC2 is output with a low value. The normal electromotive force VT2 of the second thermocouple TC2 is low because the indoor air flows into the combustion chamber 11 from the first opening 12 due to the dynamic pressure (negative pressure) of the combustion exhaust. This is because the ambient temperature of the portion 12 is low. As a result, the electromotive force difference ΔV1 between the first thermocouple TC1 and the second thermocouple TC2 is smaller than that during complete combustion, and the threshold value A for non-combustion determination is interrupted. When this state continues for a certain time (for example, 1 second), it is determined that overall incomplete combustion has occurred.

  Further, when the fins 32 of the heat exchanger 3 are totally clogged as a whole incomplete combustion, the combustion exhaust is not guided well from the heat exchanger 3 to the exhaust port 14 side, and the first opening 12 and Leakage from the second opening 13 causes the ambient temperature of the first opening 12 and the second opening 13 to rise. As a result, the electromotive force value VT2 from the second thermocouple TC2 disposed in the first opening 12 increases. On the other hand, since the flame temperature detected by the first thermocouple TC1 hardly changes, the electromotive force value VT1 from the first thermocouple TC1 is output as a high value. As a result, the electromotive force difference ΔV1 between the first thermocouple TC1 and the second thermocouple TC2 is smaller than that during complete combustion, and the threshold value A for non-combustion determination is interrupted. When this state continues for a certain time (for example, 1 second), it is determined that overall incomplete combustion has occurred.

  The non-combustion detecting means 52 outputs a non-combustible signal to the operation control means 51 and the notification means 6 when this overall incomplete combustion is detected. Then, the operation control means 51 closes the electric valve 36 of the gas supply pipe 21 and extinguishes all the burner groups 2, thereby preventing the gas water heater 1 from being used in an incombustible state. The notification means 6 notifies the user that the incomplete combustion has occurred by a warning lamp, a warning buzzer, or the like, thereby prompting the user to prohibit use, check, repair, replace, etc. the gas water heater 1.

  On the other hand, referring to the flowchart of FIG. 2, in order to detect local incomplete combustion (partial incombustibility), an electromotive force VT2 output from the second thermocouple TC2 and an electromotive force output from the third thermocouple TC3. The electromotive force difference ΔV2 from the electric power VT3 is compared with a threshold B for partial incombustibility determination (S1). Here, as the partial incombustibility, for example, when a part of the primary air inlet of the burner group 2 is blocked by a spider's web or a cockroach egg, a part of the flame of the burner group 2 is incompletely burned. It extends upward from the time of combustion and contacts the fins 32 of the heat exchanger 3. As a result, soot (carbon) accumulates on the fin 32 and closes the fin 32. For this reason, the internal pressure of the lower portion of the clogged portion of the fin 32 rises, and the combustion exhaust flows out from the opening (the first opening 12 or the second opening 13) of the combustion chamber constituting wall in the vicinity thereof, and the opening of the opening The ambient temperature rises. Due to this temperature increase, the electromotive force value VT2 or VT3 from the second thermocouple TC2 or the third thermocouple TC3 closer to the incomplete combustion portion becomes higher. On the other hand, since the combustion exhaust does not flow out from the opening (the first opening 12 or the second opening 13) near the portion where the fin 32 is not clogged, the second thermocouple TC2 disposed in the opening. Alternatively, the electromotive force value VT2 or VT3 from the third thermocouple TC3 remains almost unchanged.

  As a result, the electromotive force difference ΔV2 between the second thermocouple TC2 and the third thermocouple TC3 is larger than that during complete combustion, and exceeds the threshold B for partial incombustibility determination. When this electromotive force difference ΔV2 exceeds the threshold B, it is not determined that partial non-combustion has occurred, and this state is counted by a timer (not shown) and continued for a certain time (for example, 1 second) (S2 ), It is determined that partial incombustibility has occurred (S3). Thereby, the detection of the single partial incombustibility by disturbances, such as blowing of a wind, can be prevented.

  Then, the non-combustion detecting unit 52 outputs a partial non-combustion signal to the operation control unit 51 and the notification unit 6 when occurrence of partial non-combustion is detected. Then, the operation control means 51 closes the electromagnetic on-off valve 22 of the gas supply pipe 21 (S4), extinguishes all the burner groups 2, and stops combustion (S5). Thereby, it is possible to prevent the gas water heater 1 from being used in a partially incombustible state. Further, the notification means 6 notifies the user that the incomplete combustion has occurred by using a warning lamp, a warning buzzer or the like (S6), thereby prohibiting the user from using, checking, repairing or replacing the gas water heater 1. Etc. are encouraged.

  In addition, as a partial incombustibility, in addition to the above, even when a part of the fin 32 is closed due to peeling of the fin 32, adhesion of dust, or the like, a part of the flame of the burner group 2 facing the closed part is incompletely burned. As described above, the non-combustion detecting means 52 detects this partial incombustibility.

  On the other hand, when the electromotive force difference ΔV2 between the second thermocouple TC2 and the third thermocouple TC3 is equal to or less than the threshold B for partial incombustibility determination (“No” in S1), it is determined that there is no partial incombustibility, and the burner group 2 is continued (S7).

As described above, according to the incomplete combustion detection device according to the present embodiment, the occurrence of partial incombustibility is detected from the electromotive force difference Δ2 (temperature difference signal) between the second thermocouple TC2 and the third thermocouple TC3. The threshold B for determining the partial incombustibility for detecting the occurrence of partial incombustibility may be set according to the detection characteristics of the third thermocouple TC3 newly provided. Accordingly, the setting of the threshold B of the partial incombustibility determination for detecting the occurrence of partial incombustibility is simplified. In addition, since the occurrence of partial incombustibility is detected by the temperature difference signal between the second thermocouple TC2 and the third thermocouple TC3, the degree of occurrence of partial incombustibility at each location can be detected with substantially the same aim.
Thus, according to the present incomplete combustion detection device, not only the entire incomplete combustion in the gas water heater 1 but also the partial incombustibility can be detected. In this case, the setting of the threshold value B for detecting the occurrence of partial incombustibility is simple, and variation in the degree of detection of occurrence of partial incombustibility is suppressed. Therefore, the safety against incomplete combustion of the gas water heater 1 can be further improved.
Note that the incomplete combustion detection device according to the present invention is not limited to the above-described gas water heater as a heating device, and can also be applied to a fan heater or the like.

It is a schematic diagram which shows the structure of the gas water heater provided with the incomplete combustion detection apparatus by embodiment. It is a flowchart which shows the operation | movement of partial incombustibility detection. It is a schematic diagram which shows the structure of the gas water heater provided with the conventional incomplete combustion detection apparatus.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Gas water heater 2 Burner group 3 Heat exchanger 5 Control part 11 Combustion chamber 12 1st opening part 13 2nd opening part 32 Fin 51 Operation control means 52 Incombustibility detection means A Incombustibility determination threshold value B Partial incombustibility determination threshold value Q1, Q2 , Q3 Thermosensitive part TC1 First thermocouple (first temperature sensor)
TC2 Second thermocouple (second temperature sensor)
TC3 3rd thermocouple (3rd temperature sensor)
VT1, VT2, VT3 Electromotive force ΔV1, ΔV2 Electromotive force difference (temperature difference signal)

Claims (2)

An incomplete combustion detection device for detecting incomplete combustion in a heating device that houses a burner group and a heat exchanger in a combustion chamber,
Facing the first opening of the combustion chamber constituting wall between the first temperature sensor for detecting the temperature of the flame formed at the flame outlet and facing the flame outlet of the burner group, and the heat exchanger When the incomplete combustion of the burner group is detected based on the second temperature sensor that is installed and detects the ambient temperature of the first opening, and the temperature signals of the first temperature sensor and the second temperature sensor, the burner group And a controller for stopping the combustion of
A third temperature sensor that detects the ambient temperature of the second opening by being installed on the combustion chamber constituting wall between the burner group and the heat exchanger in hopes of the second opening away from the second temperature sensor;
Incompletely provided with a partial incombustibility detecting means for outputting a partial incombustibility signal indicating that local incomplete combustion has occurred when a temperature difference signal between the second temperature sensor and the third temperature sensor exceeds a threshold value of partial incombustibility determination Combustion detector. The incomplete combustion detection device according to claim 1,
The partial incombustibility detecting means is incompletely configured to output the partial incombustibility signal when a state in which the temperature difference signal between the second temperature sensor and the third temperature sensor exceeds the threshold value continues for a certain period of time. Combustion detector.

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