CN114136005A - Combustion apparatus - Google Patents

Combustion apparatus Download PDF

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Publication number
CN114136005A
CN114136005A CN202110912280.3A CN202110912280A CN114136005A CN 114136005 A CN114136005 A CN 114136005A CN 202110912280 A CN202110912280 A CN 202110912280A CN 114136005 A CN114136005 A CN 114136005A
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CN
China
Prior art keywords
air
combustion
ignition
burner
controller
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Pending
Application number
CN202110912280.3A
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Chinese (zh)
Inventor
竹内健
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Rinnai Corp
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Rinnai Corp
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Publication of CN114136005A publication Critical patent/CN114136005A/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H1/00—Water heaters, e.g. boilers, continuous-flow heaters or water-storage heaters
    • F24H1/10—Continuous-flow heaters, i.e. heaters in which heat is generated only while the water is flowing, e.g. with direct contact of the water with the heating medium
    • F24H1/12—Continuous-flow heaters, i.e. heaters in which heat is generated only while the water is flowing, e.g. with direct contact of the water with the heating medium in which the water is kept separate from the heating medium
    • F24H1/14—Continuous-flow heaters, i.e. heaters in which heat is generated only while the water is flowing, e.g. with direct contact of the water with the heating medium in which the water is kept separate from the heating medium by tubes, e.g. bent in serpentine form
    • F24H1/145—Continuous-flow heaters, i.e. heaters in which heat is generated only while the water is flowing, e.g. with direct contact of the water with the heating medium in which the water is kept separate from the heating medium by tubes, e.g. bent in serpentine form using fluid fuel
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H9/00—Details
    • F24H9/0005—Details for water heaters
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H9/00—Details
    • F24H9/18—Arrangement or mounting of grates or heating means
    • F24H9/1809—Arrangement or mounting of grates or heating means for water heaters
    • F24H9/1832—Arrangement or mounting of combustion heating means, e.g. grates or burners
    • F24H9/1836—Arrangement or mounting of combustion heating means, e.g. grates or burners using fluid fuel
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H9/00—Details
    • F24H9/20—Arrangement or mounting of control or safety devices
    • F24H9/2007—Arrangement or mounting of control or safety devices for water heaters
    • F24H9/2035—Arrangement or mounting of control or safety devices for water heaters using fluid fuel

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Regulation And Control Of Combustion (AREA)
  • Feeding And Controlling Fuel (AREA)

Abstract

The invention provides a combustion apparatus, wherein a controller (8) of the combustion apparatus (1) is configured to be capable of executing a normal combustion mode (STEP8) in which the opening degree of a proportional valve (72) and the rotation speed of a fan (5) are controlled so that the air-fuel ratio of a mixture of combustion air and fuel gas becomes a value suitable for ignition of a combustor (3), and a test operation mode (STEP 1): in the pilot operation mode, control is performed to ignite the burner (3) by igniting the ignition mechanism (32), and at least one of the opening degree of the proportional valve (72) and the rotation speed of the fan (5) is controlled so that the air-fuel ratio of the air-fuel mixture becomes a value smaller than the lower explosion limit, and further: and a purge operation for discharging the mixed gas supplied to the combustor (3) from the combustion chamber (2a) to the outside through the exhaust passage (6) within a predetermined time.

Description

Combustion apparatus
Technical Field
The present invention relates to a combustion apparatus including: a burner disposed in the combustion chamber and configured to burn a mixed gas of combustion air and fuel gas; a fan that supplies combustion air to the burner through the air supply path; a gas supply path for supplying fuel gas to the burner; a proportional valve provided in the gas supply path; an ignition mechanism that performs an ignition operation for igniting the burner; an ignition monitoring means for monitoring ignition of the burner; a controller that controls the fan, the proportional valve, and the ignition mechanism; and an exhaust path for discharging combustion gas generated by combustion in the combustor from the combustion chamber to the outside.
Background
Conventionally, as one of the combustion apparatuses, there has been known a combustion apparatus in which a controller is set with a test operation mode in which, when a combustion instruction to burn the gas mixture in a combustor is first issued after the combustion apparatus is installed, a large amount of air existing in a gas supply passage is discharged to the outside of the combustion chamber by supplying fuel gas (see, for example, patent document 1).
In the test operation mode, the controller opens the proportional valve to a predetermined opening degree, replaces air in the gas supply passage with fuel gas, and causes the ignition mechanism to repeatedly perform an ignition operation to ignite the burner until the air-fuel ratio of the mixture gas supplied to the burner reaches or exceeds the explosion lower limit. The lower explosive limits for methane and propane were 5.0 vol% and 2.1 vol%, respectively.
Documents of the prior art
Patent document
Patent document 1: japanese laid-open patent publication No. 5-133522
Disclosure of Invention
However, according to the combustion apparatus described in patent document 1, the opening degree of the proportional valve in the test operation mode is set by the controller as follows: the opening degree is the same as that at the time of ignition in a normal combustion mode in which combustion of the air-fuel mixture is stably performed in the combustor. However, even in a state where the air-fuel ratio of the mixture gas supplied to the burner is equal to or higher than the lower explosion limit, the burner may not be ignited due to accidental factors such as ignition failure of the ignition electrode. In this case, since a large amount of the mixture gas remains in the combustion chamber, in such a state, once the ignition mechanism is operated again to ignite the burner, there is a possibility that explosion may occur.
In view of the above problems, an object of the present invention is to provide a combustion apparatus capable of suppressing explosion in a combustor during execution of a test operation mode and improving safety.
In order to solve the above problem, a combustion apparatus according to the present invention includes: a burner disposed in the combustion chamber and configured to burn a mixed gas of combustion air and fuel gas; a fan that supplies combustion air to the burner through the air supply path; a gas supply path for supplying fuel gas to the burner; a proportional valve provided in the gas supply path; an ignition mechanism that performs an ignition operation for igniting the burner; an ignition monitoring means for monitoring ignition of the burner; a controller that controls the fan, the proportional valve, and the ignition mechanism; and an exhaust path for discharging combustion gas generated by combustion in the combustor from the combustion chamber to the outside, wherein the controller is configured to be capable of executing a normal combustion mode in which an opening degree of the proportional valve and a rotation speed of the fan are controlled so that an air-fuel ratio of the air-fuel mixture becomes a value suitable for ignition of the combustor, and a test operation mode in which: and a control unit that controls the ignition mechanism to ignite and ignite the burner, wherein in the test operation mode, at least one of the opening degree of the proportional valve and the rotation speed of the fan is controlled so that the air-fuel ratio of the air-fuel mixture becomes a value smaller than the lower explosion limit, and the control unit further performs: and a purge operation (purge operation) for discharging the air-fuel mixture supplied to the combustor to the outside through the exhaust passage within a predetermined time.
According to the present invention, the purge operation performed in the test operation mode replaces the air in the gas supply passage with the fuel gas. Because the air-fuel ratio of the mixture gas supplied to the burner is less than the explosion lower limit due to this replacement, the occurrence of explosion at the burner can be suppressed during the execution of the trial operation mode. Therefore, the safety during the erasing operation is improved.
In the present invention, it is preferable that the combustion apparatus includes, in an air supply/exhaust unit that extends from the air supply path to the exhaust path via the combustion chamber: and an air supply/exhaust unit state detection means for detecting a state in the air supply/exhaust unit, wherein the controller causes the air supply/exhaust unit state detection means to detect the state in the air supply/exhaust unit prior to the purge operation in the test operation mode, and does not perform the purge operation when the state in the air supply/exhaust unit is abnormal, and performs the purge operation when the state in the air supply/exhaust unit is normal. Accordingly, in the test operation mode, before the purge operation, the controller first determines: whether the state in the air supply and exhaust part is abnormal such as blockage or normal. This can suppress: an increase in the air-fuel ratio of the mixed gas, which is caused by a decrease in the amount of air in the mixed gas due to an abnormality in the state of the air supply/exhaust unit, a short circuit (short circuit) in which the mixed gas to be discharged flows back into the exhaust passage, or the like. Therefore, at the time of the purge operation, the mixed gas of the explosion lower limit or more can be suppressed from being supplied to the burner, and the safety of the purge operation can be further improved.
In the present invention, it is preferable that the controller shifts to the test operation mode when the ignition monitoring means does not monitor ignition of the burner even if the ignition means repeats the ignition operation a predetermined number of times during execution of the normal combustion mode. Accordingly, even in the normal combustion mode, when the amount of air in the air-fuel mixture supplied to the combustor becomes an excessive amount unsuitable for ignition of the combustor, the operation mode is automatically shifted to the test operation mode, and therefore, the trouble of switching to the test operation mode by the user or the operator can be eliminated, and the convenience can be improved.
Drawings
Fig. 1 is a schematic view showing a hot water supply heat source unit according to an embodiment of the combustion apparatus of the present invention.
Fig. 2 is a flowchart showing an aspect of control performed by the controller of the hot water supply heat source unit shown in fig. 1.
Description of the reference numerals
1 … combustion device; 2a … combustion chamber; 3 … burner; 32 … igniter (ignition mechanism); 33 … flame rod (fire monitoring mechanism); 5 … fan; 5a … air supply path; 6 … air exhaust path; 7 … gas supply path; 72 … proportional valve; 8 … a controller; a … air supply and exhaust part; a. the1… air supply and exhaust part state detection mechanism.
Detailed Description
Referring to fig. 1, an outline of a hot water supply heat source unit 1a as an embodiment of a combustion apparatus 1 according to the present invention will be described. The heat source unit 1a for hot water supply includes: a combustion chamber 2a surrounded by the combustion casing 2. A burner 3 is disposed at a lower portion of the combustion chamber 2a, and the burner 3 includes: 1 st section 3 with 5 unit burners 3a arranged side by side1And a 2 nd part 3 in which 10 unit burners 3a are arranged side by side2. In addition, in the combustion chamber 2a, a 1 st portion 3 facing the burner 3 is provided1The ignition electrode 31 of (a) is further provided with an igniter 32 as an ignition mechanism, and the igniter 32 is a high voltage applying source for applying a high voltage to the ignition electrode 31. The igniter 32 performs an ignition operation by energization, and generates a spark by the ignition electrode 31 to the part 131Ignition is performed. Further, the combustion chamber 2a is provided with: a flame lever 33 as an ignition monitoring means for monitoring ignition of the burner 3.
Disposed above the combustion chamber 2a are: a heat exchanger 4 for supplying hot water as an object to be heated. Further, to the lower surface of the combustion case 2 are connected: and a fan 5 for supplying combustion air to the combustor 3 through an air supply passage 5 a. Fan with cooling device5 the combustion air supplied includes: 1 st order air directly supplied to the unit burner 3a, and 2 nd order air supplied to the vicinity of the flame ports of the unit burner 3a through the lower portion of the combustion chamber 2 a. The water from the water supply pipe 4a on the upstream side of the heat exchanger 4 is heated by the combustion gas from the burner 3, and the hot water heated to a predetermined set temperature is discharged from the hot water discharge pipe 4b on the downstream side of the heat exchanger 4. The combustion gas having passed through the heat exchanger 4 is discharged to the outside of the combustion chamber 2a through an exhaust passage 6 connected to the upper surface of the combustion casing 2. Further, there are formed: the air supply/exhaust portion a extends from the air supply passage 5a to the exhaust passage 6 via the combustion chamber 2 a. The state in the air supply/discharge part A is detected by the air supply/discharge part state detection means A1And detected. To make the controller 8 discriminate: the state of the air supply/exhaust part A is normal without interfering with the combustion of the burner 3, or abnormal in which a blockage or the like occurs somewhere in the air supply/exhaust part A and may interfere with the combustion of the burner 3, and the air supply/exhaust part state detection means A1The state in the air supply/exhaust portion a is detected. Specifically, the air supply/exhaust unit state detection means a1The fan current of the fan 5 is detected to detect the state in the air supply/exhaust portion a.
The gas supply path 7 for supplying the fuel gas to the burner 3 is provided with: a main valve 71 formed of an electromagnetic on-off valve, and a proportional valve 72 located on the downstream side of the main valve 71. Further, the portion of the gas supply passage 7 on the downstream side of the proportional valve 72 is divided into: with part 13 of the burner 31A 1 st branch 7a connected to the 2 nd part 3 of the burner 32And a 2 nd branch 7b connected thereto. The 1 st branch path 7a and the 2 nd branch path 7b are provided with: a 1 st capacity switching valve 73a and a 2 nd capacity switching valve 73b each formed of an electromagnetic on-off valve. By opening and closing the 1 st capacity switching valve 73a and the 2 nd capacity switching valve 73b, the fuel gas is supplied to the 1 st part 3 of the combustor 31Or 1 st part 31And 2 nd part 32Both of these. In this way, the combustion capacity of the combustor 3 can be switched to 2 stages. In addition, when the igniter 32 performs an ignition operation, the fuel gas and the fuel gas are ignitedThe mixed gas of combustion air is supplied to the burner 3.
The hot water supply heat source unit 1a includes a controller 8, and the controller 8 controls the fan 5, the main valve 71, the proportional valve 72, the 1 st capacity switching valve 73a, the 2 nd capacity switching valve 73b, and the igniter 32. The controller 8 is constituted by a microcomputer provided with a CPU, ROM, RAM, a/D converter, interface, and the like. Flame rod 33 and air supply/exhaust part state detection mechanism a1Is connected to the controller 8.
The controller 8 is configured to be able to execute a normal combustion mode and a test operation mode. In the normal combustion mode, the controller 8 controls the opening degree of the proportional valve 72 and the rotation speed of the fan 5 so that the air-fuel ratio of the mixture of combustion air and fuel gas becomes a value suitable for ignition of the burner 3. Further, the controller 8 performs: and a control for igniting the burner 3 by igniting the igniter 32. Here, the air-fuel ratio suitable for ignition of the burner 3 means: an estimated value determined based on a theoretical value of the fuel gas type, the combustion capability of the burner 3, the air supply capability of the fan 5, and the like may be considered. This estimated value is set in advance in the controller 8. When the combustion instruction is issued, the controller 8 opens the main valve 71 and the 1 st capacity switching valve 73 a. The controller 8 opens the proportional valve 72, and controls the opening degree of the proportional valve 72 by controlling the magnitude of the proportional valve current supplied to the proportional valve 72, thereby controlling the portion 1 of the combustor 3 to be 31The fuel gas is supplied in such an amount that the air-fuel ratio becomes the estimated value. In addition, the controller 8 controls the supply of the 1 st portion 3 of the combustor 3 using the rotation speed of the fan 51The amount of combustion air (c).
On the other hand, in the test operation mode, the controller 8 opens the main valve 71, the proportional valve 72, and the 1 st capacity switching valve 73 a. Thereafter, the controller 8 controls at least one of the opening degree of the proportional valve 72 and the rotation speed of the fan 5 so that the air-fuel ratio of the mixture gas becomes a value smaller than the explosion lower limit, and further performs: to be supplied to the 1 st part 3 of the burner 31Is discharged from the combustion chamber 2a to the outside through the exhaust passage 6 within a predetermined timeThe cleaning action of (1).
Referring to fig. 2, the control performed by the controller 8 shown in fig. 1 is explained. When the combustion instruction is issued, the controller 8 determines whether or not the test operation mode is set (STEP 1). Here, the selection of the test operation mode or the normal combustion mode may be performed by a user or a construction worker through a remote controller or the like connected to the controller 8. The controller 8 may be set in advance so that the test operation mode is automatically selected when the combustion instruction is first issued after the hot water supply heat source unit 1a is installed.
When not in the test operation mode, the controller 8 executes the control in the normal combustion mode described above (STEP 8). On the other hand, when the test operation mode is selected, the controller 8 drives the fan 5 to supply combustion air to the 1 st portion 3 of the combustor 3 through the air supply passage 5a1Supply (STEP 2). Supplied to part 1 of burner 3, 31The combustion air passes through the combustion chamber 2a and is discharged from the exhaust passage 6 to the outside. Next, the controller 8 causes the air supply/exhaust unit state detection means a shown in fig. 1 to operate1The state in the air supply and exhaust part A is detected to judge: whether the state in the air supply/exhaust portion a is abnormal or normal (STEP 3). At this time, the controller 8 detects the state of the air supply/exhaust unit based on the state detection means a1The normality or abnormality of the state in the air supply/exhaust portion a is determined by a predetermined threshold value based on the change in the detected fan current value. Specifically, when the variation of the fan current value is lower than the threshold, the controller 8 determines that: when an abnormality such as clogging occurs in the state of the air supply/exhaust unit a and the amount of change in the fan current value is equal to or greater than a threshold value, the controller 8 determines that: the state in the air supply/discharge portion a is normal.
When the state in the air supply/exhaust portion a is normal, the controller 8 keeps the rotation speed of the fan 5 constant at a predetermined rotation speed, and opens the main valve 71 and the 1 st capacity switching valve 73a shown in fig. 1. Further, the controller 8 opens the proportional valve 72 and controls the opening degree so as to adjust the supply to the 1 st portion 3 of the combustor 31The air-fuel ratio of the mixture gas of the fuel gas and the combustion airLess than the lower explosive limit. Thus, the controller 8 performs the purge action as described above (STEP 4). When the execution of the purge operation is started, a timer is started, and the duration of the purge operation is measured. On the other hand, when an abnormality occurs in the state of the air supply/exhaust portion a, the controller 8 notifies an abnormality alarm without executing a purge operation to cancel an instruction for combustion. Then, the main valve 71, the proportional valve 72, and the 1 st capacity switching valve 73a are closed, and the fan 5 is stopped, thereby ending the test operation mode (STEP 5).
When the state in the air supply/exhaust part A is normal, the controller 8 supplies the mixed gas having the air-fuel ratio smaller than the lower explosion limit to the 1 st part 3 of the burner 31While making the air supply and exhaust part state detection means A1The state in the air supply/exhaust portion a is detected again. Then, the controller 8 discriminates again: whether the state in the air supply/exhaust portion a is abnormal or normal (STEP 6). In STEP6, when an abnormality occurs in the state of the air supply/exhaust section a, the controller 8 stops the purge operation, moves to STEP5, notifies an abnormality alarm, and ends the test operation mode. On the other hand, when the state in the air supply/exhaust portion a is normal, the controller 8 continues the purge operation.
Further, the controller 8 discriminates: whether or not the duration of the clearing operation measured by the timer is a predetermined time is determined (STEP 7). Here, the predetermined time is set in the controller 8, and the setting may be arbitrarily performed by a user or a constructor. The specific predetermined time is generally 1 minute. When the predetermined time has elapsed, the controller 8 stops the timer and shifts to the normal combustion mode (STEP8) as described above. If the predetermined time has not elapsed, the process returns to STEP 6.
When the normal combustion mode is selected and a combustion instruction is issued, the controller 8 executes control of the normal combustion mode. However, in the normal combustion mode, even if the ignition operation is repeated a predetermined number of times by energizing the igniter 32, the flame rod 33 does not detect the 1 st part 3 of the burner 31On fireIn the case of (2), the controller 8 shifts to the trial operation mode as described above. The predetermined number of times of ignition operation for shifting to the test operation mode is set in the controller 8 in advance.
According to the hot water supply heat source unit 1a, the air in the gas supply path 7 is replaced with the fuel gas by the purge operation performed in the test operation mode. Due to this replacement, the part 1 is fed to the burner 31Is less than the lower explosion limit, so that the 1 st portion 3 of the burner 3 can be suppressed in the execution of the trial operation mode1Where an explosion occurs. Therefore, the safety during the erasing operation is improved.
In the test operation mode, before the purge operation, the controller 8 determines: whether an abnormality such as clogging occurs in the air supply/discharge portion a or the state in the air supply/discharge portion a is normal. This can suppress: the air-fuel ratio of the mixed gas rises due to a decrease in the amount of air in the mixed gas caused by an abnormality in the state of the air supply/exhaust portion a, a short circuit in which the mixed gas to be discharged flows back to the exhaust passage 6, or the like. Therefore, during the purge operation, the mixed gas above the lower explosion limit can be prevented from being supplied to the 1 st portion 3 of the burner 31Thus, the safety of the erasing operation can be further improved.
Further, even in the normal combustion mode, in the 1 st portion 3 supplied to the combustor 31Becomes unsuitable for the 1 st part 3 of the burner 31Even when the fire is excessive, the operation mode is automatically shifted to the trial operation mode, and therefore, the trouble of switching to the trial operation mode by the user or the construction worker can be eliminated, and the convenience can be improved.
Although one embodiment of the present invention has been described above, the present invention is not limited to the above embodiment. For example, the structure of the burner 3 and the structure of the gas supply passage 7 associated therewith may be changed to various forms. In the purge operation performed in the test operation mode, the opening degree of the proportional valve 72 is not limited to be controlled, and the control is performed so as to supply the fuel to the combustor1 st part 3 of 31The air-fuel ratio of the air-fuel mixture of (3) is less than the explosion lower limit, and the rotation speed of the fan 5 may be controlled by making the opening degree of the proportional valve 72 constant at a predetermined opening degree. Alternatively, both the opening degree of the proportional valve 72 and the rotation speed of the fan 5 may be controlled. Further, air supply/exhaust part state detection means A1An air volume sensor or the like that can be installed at an appropriate position in the air supply/discharge unit a can be used. In the case of the air volume sensor, a threshold value relating to the air volume in the air supply/discharge portion a is set in advance in the controller 8. When the air volume in the air supply/exhaust portion a detected by the air volume sensor is smaller than the threshold value, the controller 8 determines that: when an abnormality such as clogging occurs in the air supply/exhaust unit a and the state is equal to or higher than a threshold value, it is determined that the state in the air supply/exhaust unit a is normal.
The test operation mode may be executed not only when the first combustion instruction is issued after the hot water supply heat source unit 1a is installed, but also after the fuel gas is replaced in the gas supply passage 7. Either one of STEP3 and STEP6 shown in fig. 2 may be omitted. In the test operation mode, the controller 8 may cause the igniter 32 to perform an ignition operation. In this case, even if the air-fuel ratio of the mixture gas reaches the explosion lower limit or more for some reason, the 1 st portion 3 of the burner 3 is the one when the air-fuel ratio actually reaches the explosion lower limit1And fires, and thus, the occurrence of explosion is suppressed. In addition, as the combustion apparatus 1, a heating heat source unit or the like may be exemplified in addition to the hot water supply heat source unit 1 a.

Claims (3)

1. A combustion apparatus is provided with: a burner disposed in the combustion chamber and configured to burn a mixed gas of combustion air and fuel gas; a fan that supplies combustion air to the burner through the air supply path; a gas supply path for supplying fuel gas to the burner; a proportional valve provided in the gas supply path; an ignition mechanism that performs an ignition operation for igniting the burner; an ignition monitoring means for monitoring ignition of the burner; a controller that controls the fan, the proportional valve, and the ignition mechanism; and an exhaust path for discharging combustion gas generated by combustion in the combustor from the combustion chamber to the outside,
it is characterized in that the preparation method is characterized in that,
the controller is configured to be able to execute a normal combustion mode in which the opening degree of the proportional valve and the rotation speed of the fan are controlled so that the air-fuel ratio of the air-fuel mixture becomes a value suitable for ignition of the burner, and a test operation mode in which: and a control unit that controls the ignition mechanism to ignite and ignite the burner, wherein in the test operation mode, at least one of the opening degree of the proportional valve and the rotation speed of the fan is controlled so that the air-fuel ratio of the air-fuel mixture becomes a value smaller than the lower explosion limit, and the control unit further performs: and a purge operation of discharging the mixed gas supplied to the combustor from the combustion chamber to the outside through the exhaust passage for a predetermined period of time.
2. The combustion apparatus as claimed in claim 1,
the air supply/exhaust unit that extends from the air supply path to the exhaust path via the combustion chamber includes: a gas supply/discharge unit state detection means for detecting the state of the inside of the gas supply/discharge unit,
the controller is configured to cause the air supply/discharge unit state detection means to detect the state of the air supply/discharge unit prior to the purge operation in the test operation mode, to perform the purge operation when the state of the air supply/discharge unit is abnormal, and to perform the purge operation when the state of the air supply/discharge unit is normal.
3. The combustion apparatus as claimed in claim 1 or 2,
the controller shifts to the test operation mode when the ignition monitoring means does not monitor ignition of the burner even if the ignition means repeats the ignition operation a predetermined number of times during execution of the normal combustion mode.
CN202110912280.3A 2020-09-03 2021-08-10 Combustion apparatus Pending CN114136005A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2020148397A JP2022042800A (en) 2020-09-03 2020-09-03 Combustion device
JP2020-148397 2020-09-03

Publications (1)

Publication Number Publication Date
CN114136005A true CN114136005A (en) 2022-03-04

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Application Number Title Priority Date Filing Date
CN202110912280.3A Pending CN114136005A (en) 2020-09-03 2021-08-10 Combustion apparatus

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JP (1) JP2022042800A (en)
CN (1) CN114136005A (en)

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