JP3347447B2 - Gas combustion equipment with heat exchanger fin clogging detection function - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gas combustion apparatus such as a gas water heater and a gas bath, and more particularly, to detecting a fin clogging condition of a heat exchanger for heating water flowing through a water supply pipe by heat of a gas burner. The present invention relates to a gas combustion device having a function of performing

[0002]

2. Description of the Related Art Conventionally, a control flow chart of this kind of gas combustion equipment, for example, a gas water heater, is shown in FIG. 9. When a hot water tap is opened, a water flow switch is turned on, and a blower fan starts rotating. Next, various gas valves are opened to supply gas to the gas burner, the ignition is performed by the igniter, and the heat of the combustion gas by the gas burner heats the water flowing through the water supply pipe provided to the heat exchanger, thereby obtaining tap water. Can be Then, in a normal operation state, the gas amount of the gas burner is continuously controlled (feedback control) by comparing the hot water temperature with the set temperature. On the other hand, when the hot water tap is closed, the water flow switch is turned off, various gas valves are closed, and the fan Is stopped, and the combustion is stopped.

For example, in such a gas water heater,
Various corrosion products accumulate on the fin portion of the heat exchanger, or combustion products such as soot, dust, and the like adhere.
Here, examples of the corrosion products include high-temperature oxidation products and low-temperature corrosion products. The high-temperature oxidation product is formed by copper oxide (Cu) produced by oxidizing the fin portion of the heat exchanger when the high temperature combustion exhaust gas comes into contact with the fin portion.
O) and oxides such as lead oxide (PbO) are collectively referred to as the influence of the input amount of combustion gas to the gas burner (easy when the capacity is large) or the influence of the air ratio (produced when the air ratio is low). Easily). In addition, the low-temperature corrosion products are formed in a fin portion of the heat exchanger, such as copper nitrate (Cu (NO ₃ ) ₂ ), copper carbonate (CuCO ₃ ), which is formed in a drain-like form by condensation of water and the like in the combustion exhaust gas. This is a general term for salts such as copper sulfate (CuSO ₄ ), which is caused by lowering the temperature of combustion gas when using hot water having a relatively low tapping temperature (about 40 ° C. or less). On the other hand, the combustion product (soot) refers to a product in which unburned carbon components in the combustion gas adhere as soot.

[0004]

However, such corrosion products, combustion products (soot), dust, and the like adhere to the fins of the heat exchanger due to long-term operation of the equipment. ) Increases the ventilation resistance of the combustion exhaust gas passing between the fins of the heat exchanger. As a result, the supply of air required for combustion is reduced, and a large amount of carbon monoxide gas (CO gas) is generated, resulting in poor combustion. Further, adhesion products are deposited on fins of the heat exchanger. As a result, the heat transfer efficiency of the fin portion deteriorates, and a phenomenon occurs in which a desired tapping temperature cannot be obtained. In addition, the casing itself surrounding the heat exchanger member and the gas burner due to repeated operation causes metal fatigue due to thermal strain, and a hole is formed in the combustion chamber wall, which causes a leakage of combustion gas and the like, resulting in the use of equipment. Problems such as impairment of safety also occur.

The present invention has been made in order to solve such a problem, and an object of the present invention is to provide a heat exchanger such as a gas water heater at a suitable time at which fins are clogged in a heat exchanger. The detection of the combustion contributes to avoiding incomplete combustion and improving combustion efficiency.
In addition, it is intended to achieve the permanent use of the equipment by appropriate maintenance.

[0006]

In order to achieve this object, a gas combustion apparatus having a fin clogging detection function according to claim 1 of the present invention is provided with a fin of a heat exchanger provided in a combustion gas flow path. The first detecting means for detecting the exhaust gas temperature or the flow velocity of the combustion gas passing between the fins in the wide fin interval partly by making the interval partly wider than the normal fin interval.
Combustion passed between the step and the fin in the normal fin interval
A second detecting means for detecting the exhaust temperature or the flow velocity of the gas.
The first detection means and the second detection means
The gist is that the fin clogging of the heat exchanger is detected based on a detection signal from the fin .

[0007] The heat exchanger according to claim 2 of the present invention.
Gas combustion equipment with a clogging detection function
The size of the fins arranged at equal intervals in the installed heat exchanger
Part of the fins
The fin interval is wider than the normal distance between the adjacent fins, a first detecting means for detecting the exhaust gas temperature or flow rate of the combustion gas passing between the fins of the fin spacing portion of the wide <br/> width, normal fins Second detection means for detecting the exhaust gas temperature or flow velocity of the combustion gas that has passed between the fins in the interval portion,
The gist is that the fin clogging of the heat exchanger is detected based on detection signals from the first detection means and the second detection means .

[0008]

[0009]

[0010]

[0011]

SUMMARY OF] According to the heat exchanger fins clogging detection function gas combustion apparatus of the present invention having the above configuration, the combustion gas by gas Subana is passing between the fins of the heat exchanger provided in the combustion gas flow passage, At this time, the exhaust gas temperature of the combustion gas that has passed between the fins in the fin interval portion wider than the normal fin interval is detected by the first detecting means, and the normal fin interval is detected.
The temperature of the exhaust gas of the combustion gas that has passed between the fins at
Is detected by the detecting means.

[0012]

[0013]

That is, in this case, the flow of the combustion gas by the gas burner mainly occurs in the wider fin interval as the amount of deposits on the fins of the heat exchanger increases. Since the amount of combustion gas passing through the fins decreases, the degree of change in the detection signals can be seen by taking both detection signals, and the degree of fin clogging of the heat exchanger can be detected more accurately. Will be.

For example, the interval between the fins through which the combustion gas at the exhaust temperature detected by the first detecting means passes is made larger than the normal fin interval through which the combustion gas at the exhaust temperature detected by the second detecting means passes. If there is an increase in the amount of products adhering to the fins of the heat exchanger, the combustion gas flows mainly toward the wider fin interval, and the amount of the combustion gas flowing toward the normal fin interval decreases. If the detection signal from the means changes upward, the detection signal from the other second detection means changes downward, the degree of change between the two detection signals increases, and the fins of the heat exchanger are further increased. The degree of clogging is accurately detected.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below in detail with reference to the drawings. First, the overall configuration of a gas water heater to which the present invention is applied will be described with reference to FIG. In the gas water heater 10, the water supply pipe 12 and the hot water supply pipe 14 are connected to the heat exchanger 1
6 and a water flow switch 18
However, a hot water temperature thermistor 22 is connected to the hot water supply pipe 14, respectively. A hot water tap 24 is provided at the tip of the hot water supply pipe 14.

On the other hand, a gas pipe 28 is connected to a gas burner 26 for heating the heat exchanger 16, and the gas pipe 28 is provided with a gas source solenoid valve 30, a main solenoid valve 32 and a gas proportional valve 34. A blower fan 36 is also connected to the gas burner 26. The water flow switch 18 of the water supply pipe 12, the hot water temperature thermistor 22 of the water supply pipe 14, the gas source solenoid valve 30, the main solenoid valve 32 and the gas proportional valve 34 of the gas pipe 28, and the blower fan 36 are connected to the controller 38, respectively. ing.

Next, the structure of a heat exchanger as a reference example will be described with reference to FIG. In this reference example , the above-described heat exchanger 16 and gas burner 26 are surrounded by a casing 40, and the gas burner 2
A gas flow path 42 through which the combustion gas from 6 flows toward the heat exchanger 16 is formed. On the other hand, a large number of fins 44 are arranged in the heat exchanger 16 in a direction orthogonal to the flow of the combustion gas flowing through the gas flow path 42. The interval (pitch) between the fins of the vessel 16 is constituted by the normal fin interval in the main flow path of the combustion gas ("A" in the figure), and the fin interval wider than the normal fin interval at the portion closer to one side. (“B part” in the figure). At the downstream side of the heat exchanger 16 in the casing 40, a thermocouple 46 for detecting the exhaust heat temperature of the combustion gas passing through the wide fin interval (part B) is attached to the casing wall. I have. The thermocouple 46 increases the electromotive force by detecting the temperature of the combustion gas, and is also connected to the controller 38.

The gas water heater 10 configured as above is
It works as follows. When the hot water tap 24 is opened, water flows into the water supply pipe 12 and the water flow switch 18 is turned on, and the controller 38 is turned on.
The fan 36 starts rotating by the output from. After the pre-purge, the gas source solenoid valve 30 and the main solenoid valve 32 are opened, and the gas proportional valve 34 is set in a mild ignition operation state. Thus, the gas burner 26 is slowly ignited. After the mild ignition operation is completed, proportional control is started. If there is a difference between the hot water temperature detected by the hot water temperature thermistor 22 and the set hot water temperature, the controller 38 determines the difference and sends a signal to the gas proportional valve 34, The outlet temperature of the heat exchanger 16 is kept constant by continuously changing the gas amount, and a signal is sent from the controller 38 to the fan motor of the blower fan 36 in accordance with the change in the gas amount by the gas proportional valve 34, And the amount of air is kept constant. On the other hand, when the hot water tap 24 is closed,
8 is turned off, the gas source solenoid valve 30, the main solenoid valve 3
2 and the gas proportional valve 34 are turned off, and the gas burner 2
6 extinguishes, enters the post-purge operation, and stops the fan due to the time-up of the post-purge operation.

Thus, according to the reference example , when there is no attached product on the fins of the heat exchanger 16 (relatively belonging to "new"), the combustion gas from the gas burner 26 causes the combustion gas to flow between the fins 44, 44,. The airflow resistance when passing through is substantially the same between the normal fin interval portion (portion A) and the wider fin interval portion (portion B). Therefore, it is considered based on the electromotive force value (mA) corresponding to the exhaust gas temperature of the combustion gas detected by the thermocouple 46 at that time.

When the deposits accumulate on the fins of the heat exchanger 16 by the repetitive operation, the normal fin interval portion (portion A) is narrower than the wide fin interval portion (portion B). Due to the width, a large amount of deposits accumulate, and the air flow resistance increases in the normal fin interval portion (A portion) than in the wide fin interval portion (B portion). Therefore, the amount of combustion exhaust gas passing through the normal fin interval portion (portion A) decreases, and the amount of combustion exhaust gas passing through the wide fin interval portion (portion B) increases accordingly. Flow is also faster. As a result, the contact time between the fin and the combustion exhaust gas that has passed through the wide fin interval portion (portion B) is shortened, and the exhaust gas passes between the fins at a high temperature. Since the temperature increases and the electromotive force of the thermocouple 46 increases, the controller 38 detects that the heat exchanger 16 is becoming clogged with fins.

FIG. 3 shows the relationship between the degree of clogging of the fins of the heat exchanger 16 and the electromotive force of the thermocouple 46.
The horizontal axis indicates the degree of fin clogging, and the vertical axis indicates the electromotive force (mA) of the thermocouple 46. As shown, as the fin clogging of the heat exchanger 16 increases, the thermocouple 46
The electromotive force value increases. The value of the electromotive force of the thermocouple 46 increases as the amount of combustion gas passing through the wide fin interval (part B) increases and the exhaust gas temperature rises. Fin clogging of the heat exchanger 16 due to the increase in the value,
The degree of progress of the fin clogging is determined.

FIG. 4 shows a control flow chart of the gas water heater 10. This flowchart shows how the fin clogging of the heat exchanger 16 is determined and how the instrument operates accordingly.
Open the water tap 24 and turn on the water flow switch 18 as described above.
When a signal is detected (Step 1, hereinafter simply referred to as "S1"), combustion of the gas burner 26 is started (S1).
2) However, the exhaust temperature of the combustion exhaust gas from the gas burner 26 is detected as an electromotive force value by the thermocouple 46 when passing through the wide fin interval portion (B portion) of the heat exchanger 16. As long as the electromotive force of the thermocouple 46 is determined to be equal to or lower than a certain reference value (in this embodiment, equal to or lower than AmV; point "A" in FIG. 3) (S3, "NO"), the tapping temperature becomes higher. The opening degree of the gas proportional valve 34 and the rotation speed of the blower fan 36 are controlled so that the temperature reaches the set temperature, and feedback control is performed (S4). And water flow switch 18
Is in the ON state (S5, "YES"), the combustion continues, the exhaust temperature of the combustion exhaust gas is continuously detected by the thermocouple 46, while the OFF signal of the water flow switch 18 is detected (S5, "NO"). )) And the combustion is stopped (S
6).

In such a gas combustion state, when it is determined in S3 that the electromotive force of the thermocouple 46 has become not less than AmV (S3, "YES"), a fin clogging lamp (not shown) of the gas appliance is used. Blinks to call the user's attention (S7). In this state, it is not considered that the combustion abnormality has yet occurred, so the opening degree of the gas proportional valve 34 and the rotation speed of the blower fan 36 are changed. The combustion is stably controlled by changing the constant of the feedback control (S8) (S9). Then, in S10, the thermocouple 46
During the period when the electromotive force is less than or equal to BmV (S10, "NO"), the appliance continues to operate. If the water flow switch 18 is not turned off (S11, "YES"), combustion continues, and the OFF signal of the water flow switch 18 is output. If it is detected (S11,
("NO") The combustion is stopped (S12), but the combustion is continued and the electromotive force of the thermocouple 46 is BmV (point "B" in FIG. 3).
When it is determined that the above has occurred (S10, “YE
S "), the combustion is stopped (S13), and a fin clogging abnormality indicator lamp (not shown) blinks and an alarm is sounded to warn the user (S1).
4).

Therefore, the user can detect that the fin clogging phenomenon of the heat exchanger 16 is occurring in S7 of the flow chart, and receive a warning that the fin clogging is in an abnormal state in S14, so that the user can take appropriate action. Can take maintenance measures. By doing so, it is possible to avoid damage due to excessive use of the heat exchanger 16, the casing 40, and the like, and to thereby prevent a dangerous state such as a fire caused by the fire in advance.

FIG. 5 shows a first embodiment of the present invention. In this embodiment, a large number of fins 4 are arranged in the heat exchanger 16a, which is also arranged in the casing 40.
In the main flow path of the combustion gas, the interval (pitch) of 4,44.
The “A portion”), the portion closer to one side is configured with a wider fin interval than its normal fin interval (“B portion” in the figure), but the heat exchanger 1 in the casing 40 thereof
On the downstream side of 6a, in addition to the thermocouple (1) 46 for detecting the exhaust heat temperature of the combustion gas that has passed through the wide fin interval portion (portion B), a normal fin interval portion (portion A) A thermocouple (2) 48 for detecting the exhaust gas temperature of the combustion gas that has passed through is also attached to the casing wall. Like the thermocouple (1) 46, the thermocouple (2) 48 has an electromotive force increased by detecting the combustion gas temperature, and is also connected to the controller 38. In the description of this embodiment, the same components as those of the above-described configuration of FIG. 2 are denoted by the same reference numerals, and detailed description of the configuration is omitted.

Thus, also in the embodiment shown in FIG. 5, when there is no adhered product on the fins of the heat exchanger 16a (relatively belonging to "new"), the gas burner 2
The airflow resistance when the combustion gas by the fuel cell 6 passes between the fins 44, 44,...
The fin spacing portion (B portion) wider than that is not much different and is almost in the same state. However, when deposits accumulate on the fins of the heat exchanger 16a by the repetitive operation, the normal fin spacing Since the ventilation resistance of the portion (portion A) is greater than that of the wide fin interval portion (portion B), the amount of combustion exhaust gas passing through the normal fin interval portion (portion A) is reduced, and the flow of the exhaust gas is reduced. , The amount of combustion exhaust gas passing through the wide fin interval portion (portion B) increases, and the flow of the exhaust gas also increases. As a result, the combustion exhaust gas passes at a high temperature in the wide fin interval portion (portion B), and the exhaust temperature on the downstream side of the combustion exhaust gas becomes high. Since the exhaust gas passes at a reduced temperature, the exhaust gas temperature downstream of the combustion exhaust gas is lowered.
Therefore, the electromotive force of the thermocouple (1) 46 increases, and the electromotive force of the thermocouple (2) 48 decreases.
In this case, it is detected that fin clogging is occurring in the heat exchanger 16a.

FIG. 6 shows the relationship between the degree of clogging of the fins of the heat exchanger 16a and the electromotive force values of the thermocouples (1) 46 and (2) 48, similarly to FIG.
As shown in the figure, as the fin clogging degree of the heat exchanger 16a increases, the electromotive force of the thermocouple (1) 46 increases,
The electromotive force value of the thermocouple (2) decreases. Therefore, the controller 38 detects the degree of fin clogging of the heat exchanger 16a from the difference between the electromotive force values of the two thermocouples (1) and (2). That is, as the fin clogging progresses and the amount of combustion gas passing through the wide fin interval portion (portion B) increases and the exhaust temperature increases, the electromotive force of the thermocouple (1) 46 increases, and conversely. At that time, the amount of combustion gas passing through the normal fin interval portion (portion A) decreases and the exhaust gas temperature decreases, so that the electromotive force of the thermocouple (2) 48 decreases and the electromotive force increases. Difference between と and descent (△ E)
Thus, it is determined that the heat exchanger 16a is being clogged with the fins and the degree of progress of the fin clogging is determined.

By using the two thermocouples (1) and (2) as in the embodiment shown in FIG. 5, it is possible to capture a larger variation in the electromotive force of the thermocouple than in the case of FIG. It is possible to determine the degree of fin clogging and the degree of fin clogging more accurately and earlier.

FIG. 7 shows a second embodiment of the present invention. In this embodiment, the arrangement of the fins of the heat exchanger 16b is changed. That is, as shown,
The fins 44, 44,... Are designed at equal intervals (pitch), but at a portion closer to one side, the fin size (area per sheet) is changed every other fin, and the fins having a small area are changed. Are arranged between the fins 44 having the normal size (area). As a result, the interval (pitch) between the fins is constituted by the normal fin interval in the main flow path of the combustion gas (in the figure,
The "A part"), and a part closer to one side has a fin spacing wider than the normal fin spacing ("B" part in the figure).

Thus, also in this case, as described with reference to FIGS. 2 to 6, when there is no adhesion product on the fins of the heat exchanger 16b, the combustion gas from the gas burner 26 passes between the fins. The ventilation resistance at that time is almost the same in the normal fin interval portion (A portion) and in the wide fin interval portion (B portion) in which small fins are arranged every other sheet. When adhering products accumulate on the fins of the heat exchanger 16b due to the operation, the airflow resistance increases in the normal fin interval portion (portion A) than in the wide fin interval portion (portion B), and the normal fin interval portion (portion B) increases. The passing amount of the combustion exhaust gas in the fin interval portion (portion A) decreases, and the passing amount of the combustion exhaust gas passing through the wide fin interval portion (portion B) in which small-area fins are arranged every other sheet decreases. Increase To. Although not shown,
In the case where a thermocouple was arranged downstream of the wide fin interval portion (B portion) where small area fins were arranged every other sheet (corresponding to FIG. 2 described above), the thermocouple passed therethrough. An increase in the exhaust gas temperature on the downstream side of the combustion exhaust gas is detected, and fin clogging of the heat exchanger 16 is detected. On the other hand, in the case where the thermocouples are arranged not only in the wide fin spacing portion (B portion) but also in the normal fin spacing portion (A portion) (corresponding to FIG. 5 described above), the wide fin spacing portion ( The fin clogging of the heat exchanger is detected by the increase in the electromotive force of the thermocouple disposed downstream of the part B) and the decrease in the electromotive force of the thermocouple downstream of the normal fin interval part (part A). Is what is done.

In the various embodiments described above, the thermocouple 46 or 48 is preferably mounted near the fin of the heat exchanger. In this case, the combustion exhaust gas that normally passes through the fin interval portion (portion A) and the combustion exhaust gas that passes through the wide fin interval portion (portion B) do not mix immediately after passing through the fin, so that instantaneous And the fluctuation of the electromotive force value is sensed accurately.

FIG. 8 shows another reference example for preventing the mixing of the combustion exhaust gas. This ginseng
In the example , similarly to the configuration of the heat exchanger 16 shown in FIG. 2 described above, the combustion gas by the gas burner 26 is placed in the casing 40 surrounding the heat exchanger 16 and the gas burner 26.
Are formed in the heat exchanger 16, while a large number of fins 44 are arranged in the heat exchanger 16 in a direction orthogonal to the flow of the combustion gas flowing through the gas passage 42. The interval (pitch) between the fins of the heat exchanger 16 is constituted by the normal fin interval in the main flow path of the combustion gas (“A” in the figure),
The portion closer to one side is configured with a fin interval wider than the normal fin interval ("B" in the figure),
Further, on the downstream side of the heat exchanger 16 in the casing 40, a thermocouple 46 for detecting the exhaust heat temperature of the combustion gas passing through the wide fin interval portion (portion B) is attached to the casing wall. However, the heat exchanger passes between the normal fin interval portion (portion A) and the wider fin interval portion (portion B) than the normal fin interval portion (portion A). A partition member 50 is provided for preventing the combustion gas and the combustion gas passing between the fins in the wide fin interval portion (portion B) from being mixed.

According to the reference example shown in FIG.
Since the combustion exhaust gas passing through the normal fin interval portion (portion A) and the combustion exhaust gas passing through the wide fin interval portion (portion B) are prevented from being mixed by the partitioning member 50, the wide fin portion is prevented. The exhaust gas temperature of the combustion exhaust gas that has passed through the interval portion (portion B) is accurately measured by the thermocouple 46. Although the present invention has been described based on the above embodiments, the present invention is not limited to the above embodiments, and it goes without saying that various settings can be changed without departing from the gist of the present invention. It is.

In each of the above embodiments, only an example in which a thermocouple is used to detect the exhaust gas temperature of the combustion gas is shown. However, it is needless to say that various thermistors, temperature measuring resistors, etc. may be used instead. It goes without saying that it does not matter. The change in the flow rate of the combustion gas caused by the fin clogging phenomenon may be detected by the flow rate sensor of the combustion gas. In addition, it is a commonly used means to notify the user of the fin clogging by providing an indicator lamp or an alarm device on the gas water heater main body,
At this time, it is of course possible to add various designs such as changing the blinking of the display lamp or changing the alarm sound depending on the degree of the fin clogging.

[0036]

As is apparent from the above description, according to the gas combustion apparatus having the fin clogging detection function of the heat exchanger of the present invention, corrosion products and combustion products are formed on the fins of the heat exchanger by repeated operation or the like. When soot or dust accumulates and clogs the fins, etc., it is detected accurately to avoid generation of CO gas, that is, poor combustion, or combustion gas due to perforations in the wall of the combustion chamber. It is intended to avoid the leakage of data. Therefore, application of the present invention to a gas combustion device such as a gas water heater is extremely useful in industry, for example, in that safety in use of the device is ensured.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of a gas combustion device (gas water heater) to which the present invention is applied.

FIG. 2 is a detailed configuration diagram of a main part of a gas water heater as a reference example .

FIG. 3 is a diagram illustrating the relationship between the degree of fin clogging of the heat exchanger and the electromotive force of a thermocouple in the configuration shown in FIG. 2;

FIG. 4 is a control flowchart for detecting a fin clogging phenomenon of a heat exchanger in the gas water heater shown in FIG. 2;

FIG. 5 is a detailed configuration diagram of a main part according to the first embodiment of the present invention.

6 is a diagram showing the relationship between the degree of fin clogging of the heat exchanger and the electromotive force of the thermocouple in the configuration shown in FIG.

FIG. 7 is a detailed configuration diagram of a main part according to a second embodiment of the present invention.

FIG. 8 is a detailed configuration diagram of a main part in another reference example .

FIG. 9 is a control flowchart generally known in the related art for this type of gas water heater.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Gas water heater 16, 16a, 16b Heat exchanger 26 Gas burner 38 Controller 42 Gas flow path 44, 44 ... 45, 45 ... Fin 46, 48 Thermocouple

Claims (2)

(57) [Claims] An interval between the fins of the heat exchanger provided in the combustion gas flow path is partially wider than a normal fin interval, and the exhaust gas temperature of the combustion gas passing between the fins of the wide fin interval or A first detecting means for detecting the flow velocity; and a second detecting means for detecting the exhaust gas temperature or the flow velocity of the combustion gas passing between the fins in the normal fin interval portion. 2. A gas combustion device with a fin clogging detection function for a heat exchanger, wherein the fin clogging of the heat exchanger is detected based on a detection signal from the detecting means of (2). 2. The size of fins arranged at equal intervals in a heat exchanger provided in a combustion gas flow path is partially changed, and the fin interval of a portion having a different fin size is set to be smaller than a normal fin interval. First detecting means for detecting the exhaust gas temperature or flow rate of the combustion gas passing between the fins of the wide fin interval, and the exhaust temperature or flow rate of the combustion gas passing between the fins of the normal fin interval; The second to detect
Wherein the heat exchanger is configured to detect clogging of the fins based on detection signals from the first detection means and the second detection means. Gas combustion equipment with a function to detect fin clogging in the exchanger.