JP5811610B2 - Boiler equipment - Google Patents

Description

  The present invention relates to a boiler device that can stably supply water to a can using a proportional control pump.

  For example, when controlling the amount of water supplied to the boiler unit, the intermittent control system that repeats “ON-OFF” of the water supply pump and the frequency output of the inverter based on various parameters such as the combustion amount, line pressure, etc. A proportional control method of supplying water is disclosed (for example, see Patent Documents 1 and 2). Water supply by the proportional control method is suitable for improving the thermal efficiency when blowing water concentrated in a can.

  On the other hand, when the turndown ratio (rated combustion amount / minimum combustion amount) of the boiler device increases, it is necessary to increase the supply water amount ratio (maximum water supply amount / minimum water supply amount) of the feed water pump. It is preferable to do this, and the same thing is required for a flow meter for measuring the amount of water supply. Then, the technique for supplying water to a can stably using a proportional control type pump is indicated (for example, refer to patent documents 3).

JP 2010-0708204 A JP 2008-188540 A Japanese Patent No. 4071369

  However, in the case of a boiler device having a predetermined combustion position, the feed water control for each combustion position can be applied. However, in a boiler device or a proportional control combustion boiler device having a large supply water amount ratio, Corresponding to a combustion amount (or evaporation amount) of 100%, it is difficult to stably perform appropriate water supply with a proportional control type pump. Therefore, there is a strong technical demand for a boiler apparatus that can supply water stably with a proportional control pump.

  The present invention has been made in consideration of such circumstances, and provides a boiler device that can stably supply water regardless of the amount of supplied water when supplying water to a can body by a proportional control type pump. The purpose is to do.

In order to solve the above problems, the present invention proposes the following means.
Invention of Claim 1 is a boiler apparatus provided with the can body, the combustion part which heats the said can body, the water supply part which supplies water to the said can body, and the control part, Comprising: The said control part Is a continuous mode in which water is continuously supplied from the water supply unit when the amount of water supplied from the water supply unit to the can body is larger than a threshold value while the combustion unit is heating the can body, and the water supply And an intermittent mode in which water is intermittently supplied from the water supply unit when the amount of water supply from the unit to the can body is equal to or less than a threshold value.

According to the boiler device of the present invention, when water is supplied to the can body by a proportional control type water supply pump, water is continuously supplied when the water supply amount is larger than the threshold value, and intermittent when the water supply amount is less than the threshold value. Therefore, even when the amount of water supply is small, stable water supply can be performed by ensuring the minimum amount of water that can be stably operated by the water supply pump.
In addition, since the first threshold value used when shifting from the continuous mode to the intermittent mode and the second threshold value used when shifting from the intermittent mode to the continuous mode, hunting in mode switching is suppressed, Mode switching can be performed smoothly.

  Invention of Claim 2 is a boiler apparatus of Claim 1, Comprising: The flow volume adjustment part which adjusts the amount of water supply from the said water supply part to the said can body is provided, The said control part is a case of the said continuous mode Further, the water supply amount is adjusted by the flow rate adjusting unit.

  According to the boiler apparatus according to the present invention, in the continuous mode, the water supply amount can be adjusted by the flow rate adjusting unit, so that it is possible to adjust the water supply amount while keeping the load of the water supply pump constant. it can.

  Invention of Claim 3 is a boiler apparatus of Claim 1 or 2, Comprising: The flow measurement part which measures the amount of water supply from the said water supply part to the said can body is provided, The said control part is the said flow measurement. The continuous mode or the intermittent mode is implemented based on the amount of water supply measured by the unit.

  According to the boiler device of the present invention, since the continuous mode or the intermittent mode is switched based on the water supply amount measured by the flow rate measuring unit, even if the water supply amount changes based on the water supply control parameter, the water supply By reliably detecting the amount of water supplied by the pump, the water supply pump can be appropriately controlled to be either continuous mode driving or indirect mode driving.

  Invention of Claim 4 is a boiler apparatus of any one of Claims 1-3, Comprising: The said control part makes the amount of water supply from the said water supply part to the said can body, combustion of the said combustion part It is characterized by being set according to the amount.

  According to the boiler apparatus according to the present invention, since the amount of water supply is set according to the amount of combustion in the combustion section, the amount of water corresponding to the water evaporated in the can can be reliably supplied to the can.

  Invention of Claim 5 is the boiler apparatus of any one of Claims 1-3, Comprising: The said control part is the amount of water supply from the said water supply part to the said can body, from the said can body. It is set according to the evaporation amount.

  According to the boiler device according to the present invention, the amount of water supply is set according to the evaporation amount of the combustion section, so that an amount of water corresponding to the evaporation amount in the can can be reliably supplied into the can.

Invention of Claim 6 is a boiler apparatus of any one of Claims 1-5 , Comprising: The drainage part which discharges | emits water from the said can body is provided, The said combustion part is the said combustion part. The can is continuously drained from the drainage part while the can is heated.

  According to the boiler device according to the present invention, the drainage portion is continuously drained while the combustion portion is heating the can body, so that the concentrated water can be discharged easily and efficiently.

  According to the boiler device of the present invention, when water is supplied to the can body by a proportional control type water supply pump, water is continuously supplied when the water supply amount is larger than the threshold value, and intermittent when the water supply amount is less than the threshold value. Therefore, even when the amount of water supply is small, stable water supply can be performed by ensuring the minimum amount of water that can be stably operated by the water supply pump.

It is a figure showing the schematic structure of the boiler concerning one embodiment of the present invention. It is a flowchart explaining the effect | action of the boiler apparatus which concerns on one Embodiment. It is a figure explaining the relationship between the inverter output and water supply amount in the boiler apparatus which concerns on one Embodiment.

Hereinafter, an embodiment of the present invention will be described with reference to FIGS.
FIG. 1 is a diagram illustrating a schematic configuration of a multi-tube boiler device 10 according to an embodiment, FIG. 2 is a flowchart illustrating the operation of the boiler device 10, and FIG. 3 is an inverter output in the boiler device. And the amount of water supply Q.
Show.

Hereinafter, the boiler apparatus 10 which concerns on one Embodiment is demonstrated with reference to FIG.
As shown in FIG. 1, the boiler device 10 includes a can body 1 in which water is stored, a combustion section 2 that heats the can body 1, a water supply section 3 that supplies water to the can body 1, and the inside of the can body 1. The water level detection part 4 which detects this water level, the drainage part 5 which adjusts the waste_water | drain amount from the can 1 and blows concentrated water, and the control part 6 are provided.

  The can 1 includes an upper header 7, a lower header 8, and a plurality of water pipes 9 that communicate with the upper header 7 and the lower header 8 and are arranged in an annular shape. The combustion chamber 11 is formed, and the combustion unit 2 heats the can water of the can body 1 by the combustion heat generated in the combustion chamber 11. Further, the can 1 is formed in a liquid-tight manner with respect to the outside and is disposed in the housing 1A.

  The upper header 7 is disposed at the upper portion of the can 1 and connected to the upper ends of the plurality of water pipes 9 so that steam generated in the water pipes 9 is stored. The upper header 7 is connected to the steam / water separator 14 through the steam / water line 13, and steam flows from the upper header 7 to the steam / water separator 14 through the steam / water line 13.

  The lower header 8 is disposed at the lower portion of the can body 1, is connected to the lower ends of the plurality of water pipes 9 and is connected to a water supply source (not shown) via the water supply line 12, and from the water supply source to the water supply line 12. The amount of water adjusted by the water supply unit 3 is supplied to the can 1.

  The steam / water separator 14 is connected to the steam / water line 13, the steam delivery line 18, and the precipitation line 19, separates moisture from the steam transferred through the steam / water line 13, and sends dry steam to the steam delivery line 18. At the same time, the water separated and collected by the air / water separator 14 is returned to the lower header 8. In addition, a drainage line 20 is connected to the precipitation line 19, and a drainage part 5 is provided in the drainage line 20, so that canned water concentrated in the can body 1 is discharged to the outside through the drainage part 5. Yes. The steam delivery line 18 is provided with a flow rate adjusting valve (not shown), and adjusts the amount of dry steam sent from the steam / water separator 14 and sends it to, for example, a steam consuming facility. .

  The combustion unit 2 includes a burner 27 disposed above the combustion chamber 11 and a fuel adjustment valve 29 provided in the fuel supply line 28, and the fuel supply amount is controlled by the fuel adjustment valve 29, thereby The amount of combustion is adjusted steplessly, and the can water in the can 1 is heated. Further, the evaporation amount of the boiler device 10 is adjusted according to the combustion amount of the burner 27.

The water supply unit 3 includes a water supply pump 15 provided in the water supply line 12 and an inverter 16 that controls the water supply pump 15, and controls the output of the inverter 16 to adjust the water supply amount Q of the water supply pump 15. ing.
The water supply line 12 is provided with a flow meter (flow rate measuring unit) 17 between the pump 15 and the lower header 8 so as to measure the water supply amount Q to the can body 1.

  The water level detection unit 4 includes a first water level sensor 22, a second water level sensor 23, a water level detector main body 24, an upper connection pipe 25, and a lower connection pipe 26, and the water level detector main body 24 is an upper header 7. And the upper connecting pipe 25 and the lower header 8 and the lower connecting pipe 26 to form a communication pipe with the water pipe 9 so that the water level matches the water pipe 9.

  The first water level sensor 22 and the second water level sensor 23 are formed to have different lengths and are inserted downward from the upper part of the water level detector main body 24. The first water level sensor 22 has a first set water level (for example, an upper limit water level). ) WL1, the second water level sensor 23 detects the second set water level (for example, the lower limit water level) WL2. The detection signals of the first water level sensor 22 and the second water level sensor 23 are input to the control unit 6 so that the control unit 6 maintains the water level of the water pipe 9 between the first set water level WL1 and the second set water level WL2. It has become.

  The drainage unit 5 includes, for example, a plurality of drainage valves 21 (21A, 21B) provided in parallel to the drainage line 20, and the drainage valve 21A is set to have a larger flow rate than the drainage valve 21B, and the combustion unit 2 is the When in the upper combustion position, when the amount of water supplied from the water supply unit 3 per unit time is 100%, the amount of water is 12% per unit time by the drain valve 21A and 8% (total 20%) by the drain valve 21B. Is supposed to be drained. In this embodiment, when the can body 1 is heated by the combustion unit 2, the drainage unit 5 continuously drains and blows concentrated water.

  The control unit 6 is connected to the pressure sensor 1S, the fuel adjustment valve 29 of the combustion unit 2, the inverter 16 of the water supply unit 3, the water level detection unit 4, the drain valves 21A and 21B of the drain unit 5, and the flow meter 17, and the pressure sensor 1S. Based on the pressure, water level, and water supply input from the water level detection unit 4 and the flow meter 17, the combustion amount by the combustion unit 2, the water supply amount by the water supply unit 3, and the blow amount by the drainage unit 5 are calculated. A control signal is output to the inverter 16 and the drain valve 21.

Further, the control unit 6 determines the combustion amount of the burner 27 based on the pressure of the pressure sensor 1S, the drainage amount (blow amount) by the drainage unit 5 based on the combustion amount of the burner 27, and the water supply amount by the water supply unit 3 based on the water supply control parameter. Is set.
In this embodiment, for example, in addition to the combustion amount, the water supply control parameter is a water supply temperature, a water supply pressure by a pressure gauge (not shown) provided in the water supply line 12, a water level, and the like. It should be noted that which factor is set as the water supply control parameter can be arbitrarily set.

  In addition, when the can body 1 is heated by the combustion section 2 with respect to the water supply control, the control unit 6 is configured to supply a water pump based on the water supply amount to the can body 1 detected by the flow meter 17 and the water supply threshold value. 15 is set to be driven in either continuous mode driving (continuous mode) or intermittent mode driving (indirect mode). In this embodiment, the control unit 6 selects, for example, continuous mode driving when the water supply amount to the can 1 is equal to or less than a threshold value, and intermittent mode driving for intermittently supplying water from the water supply unit 3. Specifically, the control is based on the following two threshold values (first threshold value Q1 and second threshold value Q2).

In the continuous mode, the water supply amount Q is adjusted by frequency control of the inverter 16 while the water supply pump 15 is continuously driven. When the water supply pump 15 is driven in the continuous mode, the water supply amount Q is the first. It is set when the threshold value Q1 or more, and when the feed water pump 15 is driven in the intermittent mode, the water supply amount Q is switched when the second threshold value Q2 or more.
In addition, when the feed water pump 15 is driven in the continuous mode, the inverter 16 outputs a frequency corresponding to the feed water amount. This frequency output is simple proportional (including a constant amount), PI control, PID It can be arbitrarily set based on control or the like.

In the intermittent mode, for example, the water supply pump 15 is intermittently driven by causing the inverter 16 to perform PWM output, and the water supply amount Q per unit time is adjusted while ensuring the minimum flow rate at which the water supply pump 15 operates accurately. ing. Further, when the water supply pump 15 is driven in the intermittent mode, the water supply amount Q is set to be less than the second threshold value Q2, and when the water supply pump 15 is driven in the continuous mode, the water supply amount Q is set to the first threshold value. Switching is possible when it is less than Q1. When the water supply pump 15 is driven in the intermittent mode, the PWM output by the inverter 16 corresponds to the amount of water supply.
That is, when the first threshold value Q1 or more and less than the second threshold value Q2, the drive mode of the water supply pump 15 is maintained, and the flow rate is adjusted in the maintained mode based on the instruction of the control unit 6. It has become.

Next, with reference to FIG. 2, the water supply to the can 1 by the water supply part 3 is demonstrated.
1) First, it is determined whether the boiler device 10 is in operation (S1). If it is in operation, the process proceeds to S2, and if it is not in operation, the control is terminated.
2) Next, the control unit 6 calculates a required evaporation amount (S2). The required evaporation amount is calculated based on the pressure detected by the pressure sensor 1S, for example.
3) Next, the control unit 6 outputs a signal to the combustion unit 2 so that the burner 27 has a combustion amount corresponding to the required evaporation amount (S3).
4) Next, the control part 6 outputs the signal which adjusts the opening degree of the drain valve 21, and adjusts the blow amount by the drain part 5 (S4). Here, the blow amount is set in proportion to, for example, the amount of evaporation corresponding to the amount of combustion of the boiler device 10 by the combustion unit 2.
5) Next, in addition to the blow amount, water supply control parameters (for example, water supply temperature, pressure, water level in the water level detector main body 24, etc.) are detected (S5).
6) It is determined whether the boiler apparatus 10 is heating (S6). When heating is in progress, the process proceeds to S7, and when not heating, the process proceeds to S1. Whether the boiler device 10 is being heated is determined by, for example, whether the burner 27 is burning.
7) Next, the water supply amount Q to the can 1 is detected by the flow meter 17 (S7).
8) The controller 6 determines whether or not the water supply amount Q <the first threshold value Q1 (S8). When the water supply amount Q <the first threshold value Q1, the process proceeds to S9. When the water supply amount Q ≧ the first threshold value Q1, the process proceeds to S12.
9) The control unit 6 determines whether or not the water supply pump 15 is in the continuous mode drive (S9). If the drive of the feed pump 15 is in the continuous mode, the process proceeds to S10, and if not, the process proceeds to S11.
10) The control unit 6 switches the water supply pump 15 to intermittent mode driving (S10).
11) The control unit 6 calculates the water supply amount Q based on the blow amount and the water supply control parameter, and outputs a signal corresponding to the intermittent mode (for example, each ON-OFF time) to the water supply pump 15 (S11). If S11 is performed, it will transfer to S1.
12) The controller 6 determines whether or not the water supply amount Q ≧ the second threshold value Q2 (S12). When water supply amount Q ≧ second threshold value Q2, the process proceeds to S13, and when water supply amount Q <second threshold value Q2, the process proceeds to S14.
13) The control unit 6 determines whether the drive of the feed pump 15 is in the continuous mode (S13). If the feed pump 15 is in continuous mode drive, the process proceeds to S16, and if not, the process proceeds to S11.
14) The control unit 6 determines whether the feed water pump 15 is in the indirect mode drive (S14). If the feed pump 15 is in indirect mode driving, the process proceeds to S15, and if not in intermittent mode driving, the process proceeds to S16.
15) The control unit 6 switches the feed water pump 15 to intermittent mode driving (S15).
16) The control unit 6 calculates the water supply amount Q based on the blow amount and the water supply control parameter, and outputs a signal (for example, inverter frequency) corresponding to the continuous mode drive to the water supply pump 15 (S16). If S11 is performed, it will transfer to S1.
The above 1) to 16) are repeatedly executed.

  According to the boiler device 10, stable water supply can be performed regardless of the amount of water supply Q from the water supply unit 3 to the can 1.

Next, with reference to FIG. 3, the water supply amount control from the water supply part 3 to the can 1 in the boiler apparatus 10 is demonstrated.
In FIG. 3, the horizontal axis indicates the time axis, and the vertical axis indicates the water supply amount Q detected by the flow meter 17 and the output of the inverter 16 to the water supply pump 15. In FIG. 3, for the sake of simplicity, it is assumed that the water supply pump 15 supplies the water supply amount Q detected by the flow meter 17.

1) From time zero to T1, since the water supply amount Q ≧ the second threshold value Q2, the water supply pump 15 is driven in a continuous mode, and an inverter frequency corresponding to the water supply amount Q is output.
2) Since the water supply amount Q ≧ the first threshold value Q1 at times T1 to T2, the water supply pump 15 is maintained in the continuous mode drive, and the inverter frequency corresponding to the water supply amount Q is output.
3) Since the water supply amount Q <the first threshold value Q1 at the time T2 to T3, the water supply pump 15 is switched from the continuous mode to the intermittent mode drive, and the inverter 16 is intermittent (ON-OFF (for example, ON-OFF (for example, , PWM)) output.
4) Since the second threshold value Q2> the feed water amount Q ≧ the first threshold value Q1 at the times T3 to T4, the feed pump 15 is maintained in the intermittent mode drive, and the inverter 16 is turned on according to the increase in the feed water amount Q. Output for a long time.
5) Since the second threshold value Q2> the water supply amount Q ≧ the first threshold value Q1 at times T4 to T5, the water supply pump 15 is maintained in the intermittent mode drive, and the inverter 16 is turned on according to the decrease in the water supply amount Q. Output short. Note that, just before reaching T5, the water supply amount Q is increased, but is not reflected in the output of the inverter 16.
6) Since the water supply amount Q ≧ the second threshold value Q2 after the time T5, the water supply pump 15 is switched from the intermittent mode to the continuous mode drive, and the inverter frequency corresponding to the water supply amount Q is output.

  According to the boiler device 10, since the feed water pump 15 is driven in the intermittent mode based on the feed water amount Q and the threshold value, even when the feed water amount is small, the minimum amount of water that can be stably operated is secured. Thus, stable water supply can be performed.

  Further, according to the boiler device 10, the continuous mode or the intermittent mode is switched based on the water supply amount Q measured by the flow meter 17. Therefore, even if the water supply amount changes based on the water supply control parameter or the like, the water supply The amount of water supplied by the pump 15 can be reliably detected, and the water supply pump 15 can be appropriately controlled to be either continuous mode driving or indirect mode driving.

  Moreover, according to the boiler apparatus 10, since the water supply amount Q is set according to the combustion amount of the combustion part 2, the quantity of water corresponding to the water evaporated in the can 1 is reliably supplied to the can 1. be able to.

  Moreover, according to the boiler device 10, since the first threshold value Q1 used when shifting from the continuous mode to the intermittent mode and the second threshold value Q2 used when shifting from the intermittent mode to the continuous mode are provided, Mode switching can be performed smoothly by suppressing hunting in mode switching.

  Moreover, according to the boiler apparatus 10, since the combustion part 2 is continuously draining from the drainage part 5 in the state which is heating the can 1, concentrated water can be discharged | emitted easily and efficiently, It is possible to effectively prevent scale adhesion, corrosion, and carry-over due to water concentration and to save energy by suppressing a decrease in thermal efficiency related to blow.

  Moreover, since the drainage unit 5 includes a plurality of drainage valves 21A and 21B, the drainage amount from the can 1 can be easily and accurately adjusted by selectively opening and closing the drainage valves 21A and 21B. Can do.

  In addition, this invention is not limited to the said embodiment, A various change can be added in the range which does not deviate from the meaning of this invention.

  For example, in the above embodiment, when the differential is set between the first threshold value Q1 when switching the feed water pump from the continuous mode to the intermittent mode and the second threshold value Q2 when switching from the intermittent mode to the continuous mode. However, a configuration may be adopted in which a single threshold is set and no differential is provided. Further, instead of the differential, a configuration in which a delay time is set may be employed.

  In the above embodiment, the case where the boiler apparatus 10 can adjust the combustion amount steplessly by proportionally controlled combustion of the burner 27 has been described. However, the combustion amount can be controlled stepwise (for example, high combustion , Medium combustion, low combustion, and 4-position control that can be controlled to stop combustion). In such a case, for example, a large turndown ratio 5 (when the combustion amount in high combustion is 100%) In particular, an excellent effect can be obtained with a multi-position control boiler device having a low combustion of 20% or more.

  Moreover, in the said embodiment, although the drainage part 5 demonstrated the case where the two drainage valves 21A and 21B were provided, the number of the drainage valves 21 is not limited to this, For example, the drainage valve 21 May be one, or three or more drain valves may be provided to adjust the blow amount with high accuracy corresponding to the combustion position and the like. Moreover, it may replace with the drain valve 21 and may provide the pump which drains the can water of the can 1 and may adjust the amount of drainage.

  In the above embodiment, the case where the water tube is a multi-tube boiler device 10 in which the water tubes are arranged in an annular shape has been described. However, boilers having various structures such as a small once-through steam boiler device, a furnace flue tube boiler, and the like. You may apply to an apparatus.

Moreover, in the said embodiment, when the can 1 was a heating state, although the drainage part 5 demonstrated the case where it drains continuously, For example, the cumulative value of drainage time, the cumulative value of drainage amount (for example, The drainage may be intermittently controlled based on the drainage valve 21 opening and drainage time).
Moreover, in the said embodiment, although the case where the water supply amount Q with respect to the can 1 was set based on the combustion amount of the burner 27 was described, you may set instead of a combustion amount according to the evaporation amount.

  Further, in addition to the water supply pump 15 for supplying water from the water supply unit 3, a flow rate adjustment valve (flow rate adjustment unit) (not shown) is provided in the water supply line 12, and the water supply amount Q is adjusted by the opening of the flow rate adjustment valve. Well, in that case, it is possible to set a large supply water amount ratio and improve water supply accuracy.

  Moreover, in the said embodiment, although the case where the water supply amount Q to the can 1 was adjusted with the water supply pump 15 was demonstrated, with the water supply pump 15, for example, by the valve opening degree of a flow control valve (flow rate adjustment part). The amount of water supply may be adjusted.

  Moreover, in the said embodiment, although the schematic structure of the example regarding the driving | operation of the boiler apparatus 10 was shown as a flowchart, you may use the method (algorithm) which concerns on another flowchart.

  According to the boiler device of the present invention, when water is supplied to the can body by the proportional control pump, stable water supply and flow rate measurement can be performed regardless of the water supply amount Q, and therefore, it can be used industrially.

DESCRIPTION OF SYMBOLS 1 Can body 2 Combustion part 3 Water supply part 5 Drainage part 6 Control part 10 Boiler apparatus 15 Water supply pump 16 Inverter 17 Flowmeter (flow rate measurement part)
27 Burner (combustion section)

Claims (6)

Can body,
A combustion section for heating the can body;
A water supply unit for supplying water to the can body;
A boiler device comprising a control unit,
The controller is
In a state where the combustion part is heating the can body,
When the amount of water supplied from the water supply unit to the can body is larger than a threshold value, continuous mode for continuously supplying water from the water supply unit;
When the amount of water supplied from the water supply unit to the can body is equal to or less than a threshold value, the intermittent mode of intermittently supplying water from the water supply unit , and
The threshold is
A first threshold used when transitioning from the continuous mode to the intermittent mode;
And a second threshold value used when shifting from the intermittent mode to the continuous mode . The boiler device according to claim 1,
A flow rate adjusting unit for adjusting the amount of water supplied from the water supply unit to the can body;
The controller is
In the case of the continuous mode, the water supply amount is adjusted by the flow rate adjusting unit. The boiler device according to claim 1 or 2,
A flow rate measuring unit for measuring the amount of water supplied from the water supply unit to the can body,
The controller is
The boiler apparatus characterized by implementing the continuous mode or the intermittent mode based on the amount of water supply measured by the flow rate measuring unit. It is a boiler apparatus of any one of Claims 1-3,
The controller is
The boiler apparatus characterized by setting the amount of water supplied from the water supply unit to the can body according to the combustion amount of the combustion unit. It is a boiler apparatus of any one of Claims 1-3,
The controller is
A boiler apparatus, wherein a water supply amount from the water supply unit to the can body is set in accordance with an evaporation amount from the can body. It is a boiler apparatus of any one of Claims 1-5 ,
A drainage part for discharging water from the can body,
The controller is
In a state where the combustion part is heating the can body,
A boiler device that continuously drains water from the drainage section.

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