JP6221468B2 - Boiler equipment - Google Patents

Description

  The present invention relates to a boiler device.

  Conventionally, boilers that generate steam by heating water with combustion gas generated by burning fuel gas in a can body are known. In the boiler, the fuel gas is mixed with combustion air and then supplied to the can body. The ratio (air / fuel ratio) at which the combustion air supplied to the can body and the fuel gas are mixed needs to be kept constant in order to stabilize the combustion state inside the can body.

  As a device for controlling the amount of fuel gas to be supplied in accordance with fluctuations in the amount of combustion air supplied to the can body, a pressure reducing means is provided inside the air supply duct through which the combustion air flows. A gas amount control device that controls the amount of fuel gas to be supplied based on the pressure difference (differential pressure) between before and after is proposed (for example, see Patent Document 1).

  Thus, if the pressure reducing means is provided in the air supply duct, the supply amount of the combustion air can be calculated based on the differential pressure before and after the pressure reducing means of the combustion air flowing through the air supply duct. The amount of fuel gas supplied to the air supply duct can be easily controlled, and the air-fuel ratio can be kept constant.

JP-A-11-108352

  However, even when the amount of fuel gas is controlled based on the differential pressure before and after the decompression means for the combustion air flowing through the air supply duct, the can is caused by clogging of the pipe inside the boiler or fluctuations in the pressure on the exhaust tube side. An error between the amount of fuel gas necessary for combustion in the body and the amount of fuel gas actually supplied to the air supply duct may increase.

  The present invention solves the above-described problem, and prevents an error between the amount of fuel gas necessary to keep the air-fuel ratio constant and the amount of fuel gas actually supplied to the air supply duct from increasing. An object of the present invention is to provide a boiler device that can be used.

  The present invention relates to a can body, a blower that supplies air to the can body, an air supply duct that connects the can body and the blower, and through which air supplied from the blower circulates, and the air supply duct. An air pressure reducing member that depressurizes the air flowing through the air supply duct, and an air supply differential pressure that detects a differential pressure between an upstream pressure and a downstream pressure of the air pressure reducing member in the air supply duct. A detection unit, a gas supply line connected to the air supply duct and supplying fuel gas to the air supply duct, and an amount of fuel gas arranged in the gas supply line and supplied to the air supply duct are adjusted. A regulating valve, a fuel gas decompressing member that is disposed downstream of the regulating valve in the gas supply line and decompresses the fuel gas flowing through the gas supply line, and a fuel gas decompressing member in the gas supply line Upstream pressure and A gas differential pressure detection unit that detects a differential pressure with respect to the flow-side pressure; and a control unit that controls the opening degree of the regulating valve, wherein the control unit is detected by the supply air differential pressure detection unit The target supply amount of the fuel gas to be supplied to the air supply duct is calculated from the differential pressure, and the opening of the adjusting valve is set so that the supply amount of the fuel gas supplied to the air supply duct becomes the fuel gas target supply amount. The present invention relates to a boiler device comprising: a first control unit that controls the first control unit; and a second control unit that corrects the opening of the regulating valve based on the differential pressure detected by the gas differential pressure detection unit.

  The gas differential pressure detection unit includes a differential pressure sensor that detects a differential pressure between an upstream pressure and a downstream pressure of the fuel gas decompression member, and the second control unit uses the differential pressure sensor. It is preferable to correct the opening degree of the regulating valve based on the detected differential pressure.

  The gas differential pressure detector includes a first pressure sensor that detects a pressure upstream of the fuel gas decompression member, and a second pressure sensor that detects a pressure downstream of the fuel gas decompression member. The second control unit preferably corrects the opening degree of the regulating valve based on a difference between the pressure detected by the first pressure sensor and the pressure detected by the second pressure sensor.

  Further, the second control unit calculates a fuel gas supply amount to be supplied to the air supply duct from a differential pressure detected by the gas differential pressure detection unit, and the fuel gas supply amount and the fuel gas target supply are calculated. When the difference from the amount exceeds a predetermined first threshold value, the opening of the adjustment valve is decreased, and the difference between the fuel gas target supply amount and the fuel gas supply amount is a predetermined second threshold value. It is preferable to control so that the opening degree of the adjusting valve is increased.

  According to the boiler apparatus of the present invention, it is possible to prevent an error between the amount of fuel gas necessary for keeping the air-fuel ratio constant and the amount of fuel gas actually supplied to the air supply duct from increasing.

It is a figure showing typically the boiler device concerning a 1st embodiment of the present invention. It is the BB sectional view taken on the line of FIG. It is a flowchart explaining the process which adjusts the supply amount of fuel gas in the boiler apparatus which concerns on 1st Embodiment. It is a figure which shows typically the boiler apparatus which concerns on 2nd Embodiment of this invention.

  Hereinafter, preferred embodiments of the boiler device of the present invention will be described with reference to the drawings.

<First Embodiment>
First, the boiler apparatus 1 which concerns on 1st Embodiment of this invention is demonstrated.
The boiler device 1 according to the first embodiment generates steam by heating water. As shown in FIG. 1, the boiler apparatus 1 includes a can body 10, a blower 20 that supplies air to the can body 10, an air supply duct 30 through which air supplied from the blower 20 circulates, and an air supply duct 30. A punching metal 40 as an air decompression member, an air supply differential pressure detection unit 50 for detecting a differential pressure between an upstream pressure and a downstream pressure of the punching metal 40 in the air supply duct 30; A gas supply line 60 for supplying fuel gas to the duct 30, an adjustment valve 70 disposed in the gas supply line 60, and an orifice as a fuel gas decompression member disposed downstream of the adjustment valve 70 of the gas supply line 60 80, a gas differential pressure detector 90 that detects a differential pressure between the upstream pressure and the downstream pressure of the orifice 80 in the gas supply line 60, and the combustion gas discharged from the can body 10 flows. It includes an exhaust stack 100, a water supply channel for supplying water to the boiler body 10 (not shown), a control unit 110 for controlling the amount of fuel gas supplied to the air supply duct 30.

As shown in FIGS. 1 and 2, the can body 10 includes a boiler housing 11, a plurality of water pipes 12, a connecting wall 13, a lower header 14, an upper header 15, and a burner 17.
The boiler housing | casing 11 comprises the external shape of the can 10, and is formed in the rectangular parallelepiped shape of planar view. An air supply port 18 is formed in the first side surface 11 a located on one end side in the longitudinal direction of the boiler housing 11, and a second side surface 11 b located on the other end side in the longitudinal direction of the boiler housing 11 is An exhaust port 19 is formed.
A front end portion of an air supply duct 30 described later is connected to the air supply port 18. The exhaust port 19 is connected to a base end portion of an exhaust cylinder 100 described later.

The plurality of water pipes 12 are disposed in the boiler casing 11 so as to extend in the vertical direction, and are disposed at predetermined intervals in the longitudinal direction and the width direction of the boiler casing 11.
In the present embodiment, the plurality of water tubes 12 are arranged along the longitudinal direction at the outer water tube group 12 a arranged along the side portion extending in the longitudinal direction of the boiler housing 11 and at the center portion in the width direction of the boiler housing 11. The central water pipe group 12b is disposed between the outer water pipe group 12a and the central water pipe group 12b.
The connection wall 13 connects the water pipes 12 arranged adjacent to each other in the outer water pipe group 12a.

  The lower header 14 is configured by a rectangular parallelepiped container having a rectangular shape in plan view, and is disposed at the lower portion of the boiler casing 11. The lower header 14 is connected to lower ends of the plurality of water pipes 12. Water is supplied to the lower header 14, and water is supplied from the lower header 14 to the plurality of water pipes 12.

The upper header 15 is configured by a rectangular parallelepiped container having a rectangular shape in plan view, and is disposed on an upper portion of the boiler casing 11. The upper header 15 is connected to the upper ends of the plurality of water pipes 12. Steam generated in the plurality of water pipes 12 is collected in the upper header 15. The steam collected in the upper header 15 is led out through a steam lead-out pipe (not shown).
The burner 17 is disposed in the air supply port 18.

  The blower 20 has air wheel blades (not shown). The air wheel blade is disposed inside the blower 20. As the air wheel blades rotate, the combustion air is drawn into the blower 20 and sent into an air supply duct 30 described later.

The air supply duct 30 has an upstream end connected to the blower 20 and a downstream end connected to the air supply port 18. The air supply duct 30 supplies the combustion air sent from the blower 20 to the can body 10.
The punching metal 40 is a metal plate in which a through hole is formed. The punching metal 40 depressurizes the combustion air flowing through the air supply duct 30.
The air supply differential pressure detection unit 50 includes a differential pressure sensor PD1 that detects a differential pressure between an upstream pressure and a downstream pressure of the punching metal 40. The differential pressure sensor PD1 outputs the detected differential pressure to the control device 110 described later.

  The gas supply line 60 is connected to the air supply duct 30 on the downstream side of the position where the punching metal 40 is disposed. The gas supply line 60 includes a pressure sensor PS and a nozzle 61. The pressure sensor PS detects the pressure of the fuel gas supplied to the air supply duct 30. The pressure sensor PS outputs the detected pressure to an emergency control device (not shown). This emergency control device prevents fuel gas from being excessively supplied by closing an adjustment valve 70 described later when the pressure detected by the pressure sensor PS exceeds a predetermined value. The nozzle 61 is disposed at the tip of the gas supply line 60 and ejects fuel gas into the air supply duct 30.

The adjustment valve 70 adjusts the flow rate of the fuel gas supplied to the air supply duct 30.
The orifice 80 depressurizes the fuel gas flowing through the gas supply line 60. The orifice 80 is disposed upstream of the pressure sensor PS in the gas supply line 60.
The gas differential pressure detection unit 90 includes a differential pressure sensor PD2 that detects a differential pressure between the pressure on the upstream side of the orifice 80 and the pressure on the downstream side. The differential pressure sensor PD2 outputs the detected differential pressure to the control device 110 described later.

The exhaust tube 100 is connected to the exhaust port 19 and discharges combustion gas generated by burning fuel gas inside the can body 10.
The control device 110 stabilizes the combustion state of the combustion gas inside the can body 10 by controlling the amount of fuel gas supplied to the air supply duct 30.

  According to the boiler apparatus 1 described above, the combustion air sent to the air supply duct 30 by the blower 20 is mixed with the fuel gas supplied from the gas supply line 60, and the mixed gas of the fuel gas and the combustion air is mixed. It is ejected from the burner 17 into the inside of the can 10 and burned. And the water supplied with the combustion of the mixed gas by the burner 17 heats the water supplied from the lower header 14 to the inside of the plurality of water pipes 12 to generate steam. The steam generated in the plurality of water pipes 12 is collected in the upper header 15 and then led out to the outside through a steam outlet pipe (not shown). Further, the combustion gas generated by the combustion of the mixed gas is discharged from the exhaust tube 100 to the outside.

Next, control of the amount of fuel gas supplied to the air supply duct 30 by the control device 110 will be described.
The control device 110 includes a control unit 111 and a storage unit 112. The control unit 111 controls the opening degree of the adjustment valve 70. The control unit 111 includes a first control unit 113 and a second control unit 114.

  The first control unit 113 calculates a fuel gas target supply amount to be supplied to the air supply duct 30 from the differential pressure detected by the differential pressure sensor PD1 (supply air differential pressure detecting unit 50). The fuel gas target supply amount is the amount of combustion gas that stabilizes the combustion state inside the can 10 corresponding to the amount of combustion air corresponding to the differential pressure detected by the differential pressure sensor PD1. Further, the first control unit 113 controls the opening degree of the adjustment valve 70 so that the supply amount of the fuel gas supplied to the air supply duct 30 becomes the fuel gas target supply amount.

The second control unit 114 corrects the opening degree of the regulating valve 70 based on the differential pressure detected by the differential pressure sensor PD2 (gas differential pressure detection unit 90). That is, the second control unit 114 compares the fuel gas supply amount calculated from the differential pressure detected by the differential pressure sensor PD2 with the fuel gas target supply amount calculated by the first control unit 113, and the comparison result. Based on the above, the opening of the regulating valve 70 is corrected.
More specifically, first, the second control unit 114 calculates the amount of fuel gas supplied to the air supply duct from the differential pressure detected by the differential pressure sensor PD2 (gas differential pressure detection unit 90).
The second control unit 114 has a predetermined difference ((fuel gas supply amount) − (fuel gas target supply amount)) between the fuel gas supply amount and the fuel gas target supply amount calculated by the first control unit 113. If the first threshold value is exceeded, the opening degree of the regulating valve 70 is controlled to be small. That is, in this case, since the actual supply amount of the fuel gas is in a state greatly exceeding the target supply amount of the fuel gas, the supply amount of the fuel gas is reduced by reducing the opening of the adjustment valve 70.
On the other hand, the second control unit 114 has a predetermined difference ((fuel gas target supply amount)-(fuel gas supply amount)) between the fuel gas target supply amount calculated by the first control unit 113 and the fuel gas supply amount. When the second threshold value is exceeded, control is performed so that the opening degree of the regulating valve 70 is increased. That is, in this case, since the actual supply amount of the fuel gas is substantially lower than the target supply amount of the fuel gas, the supply amount of the fuel gas is increased by increasing the opening of the adjustment valve 70.

  The storage unit 112 detects the relationship between the differential pressure detected by the differential pressure sensor PD1 and the fuel gas target supply amount, the opening degree of the adjustment valve 70 according to the calculated fuel gas target supply amount, and the differential pressure sensor PD2. The relationship between the differential pressure and the fuel gas supply amount is stored.

FIG. 3 is a flowchart illustrating a process for adjusting the supply amount of the fuel gas.
First, in step ST1, the differential pressure between the upstream pressure and the downstream pressure of the punching metal 40 is detected by the differential pressure sensor PD1 (supply differential pressure detector 50). Then, the differential pressure sensor PD1 outputs the detected differential pressure to the first control unit 113.

  In step ST2, the first control unit 113 calculates a fuel gas target supply amount to be supplied to the air supply duct 30 from the differential pressure detected by the differential pressure sensor PD1. Specifically, the first control unit 113 calculates the fuel gas target supply amount from the relationship between the differential pressure detected by the differential pressure sensor PD1 and the fuel gas target supply amount stored in advance in the storage unit 112. .

  In step ST3, the first control unit 113 controls the opening degree of the adjustment valve 70 so that the supply amount of the fuel gas supplied to the air supply duct 30 becomes the fuel gas target supply amount calculated in step ST2. . Specifically, the first control unit 113 controls the opening of the adjustment valve 70 to an opening corresponding to the fuel gas target supply amount stored in the storage unit 112.

  In step ST4, the differential pressure sensor PD2 (gas differential pressure detector 90) detects the differential pressure between the upstream pressure and the downstream pressure of the orifice 80. Then, the differential pressure sensor PD2 outputs the detected differential pressure to the second control unit 114.

  In step ST5, the second control unit 114 calculates the amount of fuel gas supplied to the air supply duct 30 from the differential pressure detected by the differential pressure sensor PD2. Here, the fuel gas supply amount supplied to the air supply duct 30 is an actual fuel gas supply amount when the differential pressure is detected by the differential pressure sensor PD2. Specifically, the second control unit 114 calculates the fuel gas supply amount from the relationship between the differential pressure detected by the differential pressure sensor PD2 and the fuel gas supply amount stored in the storage unit 112.

  Subsequently, the second control unit 114 compares the fuel gas supply amount calculated in step ST5 with the fuel gas target supply amount calculated in step ST2, and corrects the opening degree of the adjustment valve 70. By correcting the opening degree of the regulating valve 70, it is possible to prevent the difference between the fuel gas supply amount and the fuel gas target supply amount from increasing.

Specifically, in the process of correcting the opening degree of the regulating valve 70, first, in step ST6, the second controller 114 determines the difference between the fuel gas supply amount and the fuel gas target supply amount ((fuel gas supply amount)). -(Fuel gas target supply amount)). If the second control unit 114 determines that the difference is equal to or smaller than the predetermined first threshold value, the second control unit 114 moves the process to step ST7. On the other hand, if the difference exceeds a predetermined first threshold value, the process proceeds to step ST8.
In step ST <b> 8, the second control unit 114 reduces the amount of fuel gas supplied to the air supply duct 30 by reducing the opening of the adjustment valve. In step ST8, after reducing the opening of the regulating valve, the series of processes is terminated.

In step ST7, the second control unit 114 calculates the difference between the fuel gas target supply amount and the fuel gas supply amount ((fuel gas target supply amount) − (fuel gas supply amount)). If the second control unit 114 determines that the difference is equal to or smaller than the predetermined second threshold value, the second control unit 114 ends the process. On the other hand, if the difference exceeds a predetermined second threshold value, the process proceeds to step ST9.
In step ST <b> 9, the second control unit 114 increases the amount of fuel gas supplied to the air supply duct 30 by increasing the opening of the adjustment valve. In step ST9, the process is also ended after increasing the opening of the adjusting valve.

The boiler device 1 according to the first embodiment of the present invention has the following effects.
(1) In the boiler device 1 according to the first embodiment, the opening degree of the adjustment valve 70 is set in the first control unit 113 so that the supply amount of the fuel gas supplied to the supply duct 30 becomes the fuel gas target supply amount. Then, based on the differential pressure detected by the gas differential pressure detector 90, the second controller 114 corrects the opening degree of the regulating valve 70. Thereby, it is possible to prevent an error between the amount of fuel gas necessary to keep the air-fuel ratio constant and the amount of fuel gas actually supplied to the air supply duct from increasing. Therefore, according to the boiler apparatus 1, the combustion state in the inside of the can 10 can be stabilized.

  (2) In the boiler device 1 according to the first embodiment, the gas differential pressure detector 90 includes the differential pressure sensor PD2. Further, based on the differential pressure detected by the differential pressure sensor PD2, the second control unit 114 corrects the opening degree of the regulating valve 70. Thereby, the gas differential pressure detection part 90 can be comprised by attaching differential pressure sensor PD2 to the existing boiler apparatus. Therefore, the air-fuel ratio can be stabilized with the existing boiler device.

(3) In the boiler apparatus 1 according to the first embodiment, the second control unit 114 calculates the fuel gas supply amount supplied to the air supply duct 30 from the differential pressure detected by the gas differential pressure detection unit 90. . When the difference between the fuel gas supply amount and the fuel gas target supply amount ((fuel gas supply amount) − (fuel gas target supply amount)) exceeds a predetermined first threshold value, the second control unit 114 was controlled to reduce the opening of the regulating valve 70. Thereby, when the supply amount of the fuel gas actually supplied greatly exceeds the target supply amount of the fuel gas, the supply amount of the fuel gas can be reduced by reducing the opening degree of the adjustment valve 70.
On the other hand, when the difference between the fuel gas target supply amount and the fuel gas supply amount ((fuel gas target supply amount) − (fuel gas supply amount)) exceeds a predetermined second threshold, the second control unit 114 was controlled to increase the opening degree of the regulating valve 70. Thereby, when the supply amount of the fuel gas actually supplied is significantly lower than the fuel gas target supply amount, the supply of the fuel gas can be increased by increasing the opening degree of the adjustment valve 70. Therefore, according to the boiler apparatus 1, no significant deviation occurs between the fuel gas supply amount and the fuel gas target supply amount, and the air-fuel ratio can be stabilized.

Second Embodiment
Next, a boiler apparatus 1A according to a second embodiment of the present invention will be described.
In addition, about 1 A of boiler apparatuses which concern on 2nd Embodiment, the different structure from the boiler apparatus 1 which concerns on 1st Embodiment is demonstrated, and description is abbreviate | omitted about the same structure.
FIG. 4 is a diagram schematically showing a boiler apparatus 1A according to the second embodiment of the present invention.

The boiler device 1A of the second embodiment is mainly different from the first embodiment in the configuration of the gas differential pressure detector 90A.
The gas differential pressure detection unit 90A includes a first pressure sensor PS1 and a second pressure sensor PS2. The first pressure sensor PS1 detects the pressure on the upstream side of the orifice 80A. The second pressure sensor PS2 detects the pressure on the downstream side of the orifice 80A. Here, the adjustment valve 70A may be closed when the pressure detected by the second pressure sensor PS2 exceeds a predetermined value. Thereby, it can prevent that fuel gas becomes excessive supply.

Subsequently, control of the amount of fuel gas supplied to the air supply duct 30A by the control device 110A will be described with reference to the flowchart of FIG. 3, but description of the same processing as in the first embodiment will be omitted.
In the second embodiment, the second control unit 114A corrects the opening degree of the adjustment valve 70A based on the difference between the pressure detected by the first pressure sensor PS1 and the pressure detected by the second pressure sensor PS2. To do.

In the second embodiment, the first pressure sensor PS1 and the second pressure sensor PS2 output the detected pressure to the second control unit 114A (step ST4 in FIG. 3).
Next, the second control unit 114A calculates the amount of fuel gas supplied to the air supply duct 30 from the pressures detected by the first pressure sensor PS1 and the second pressure sensor PS2 (step ST5 in FIG. 3). ). Specifically, the second control unit 114A calculates a differential pressure between the pressure on the upstream side and the pressure on the downstream side of the orifice 80A from the pressures detected by the first pressure sensor PS1 and the second pressure sensor PS2. Subsequently, the second control unit 114A further calculates a fuel gas supply amount supplied to the air supply duct 30A from the calculated differential pressure.
114 A of 2nd control parts correct | amend the opening degree of the adjustment valve 70A using this fuel gas supply amount (step ST6-9 of FIG. 3).

The boiler device 1A according to the second embodiment of the present invention has the following effects in addition to the above (1) and (3).
(4) In the boiler device 1A according to the second embodiment, the gas differential pressure detection unit detects the upstream pressure of the gas decompression member, and the second pressure sensor PS2 detects the downstream pressure. And provided. Further, based on the difference between the pressure detected by the first pressure sensor PS1 and the pressure detected by the second pressure sensor PS2, the second controller 114A corrects the opening of the adjustment valve 70A. Thereby, for example, in order to prevent excessive supply of fuel gas, in addition to the pressure sensor (second pressure sensor PS2) provided in the existing boiler apparatus, the first pressure sensor PS1 is attached, so that the gas differential pressure is obtained. The detection unit 90A can be configured. Therefore, the air-fuel ratio can be stabilized with the existing boiler device.

The preferred embodiments of the boiler device of the present invention have been described above. However, the present invention is not limited to the above-described embodiments, and can be modified as appropriate.
In the above-described embodiment, the boiler apparatus 1, 1 </ b> A includes the punching metal 40, 40 </ b> A as the air decompression member disposed in the air supply duct 30, 30 </ b> A, but the air decompression member is not limited to the punching metal. . For example, a member capable of reducing the inner diameter of a part of the air supply ducts 30 and 30A may be disposed in the air supply ducts 30 and 30A.

1,1A boiler device 10,10A can body 20,20A blower 30,30A air supply duct 40,40A punching metal (air decompression member)
50, 50A Supply air differential pressure detector 60, 60A Gas supply line 70, 70A Regulating valve 80, 80A Orifice (fuel gas decompression member)
90, 90A Gas differential pressure detection unit 100, 100A Exhaust tube 110, 110A Control device 111, 111A Control unit 113, 113A First control unit 114, 114A Second control unit

Claims (4)

Can body,
A blower for supplying air to the can body;
An air supply duct that connects the can body and the blower, and through which air supplied from the blower flows,
An air pressure-reducing member that is disposed in the air supply duct and depressurizes air flowing through the air supply duct;
An air supply differential pressure detection unit that detects a differential pressure between the pressure on the upstream side and the pressure on the downstream side of the air decompression member in the air supply duct;
A gas supply line connected to the air supply duct for supplying fuel gas to the air supply duct;
An adjustment valve arranged in the gas supply line and for adjusting the amount of fuel gas supplied to the air supply duct;
A fuel gas decompression member that is disposed downstream of the regulating valve of the gas supply line and decompresses the fuel gas flowing through the gas supply line;
A gas differential pressure detector for detecting a differential pressure between the upstream pressure and the downstream pressure of the fuel gas decompression member in the gas supply line;
A control unit for controlling the opening of the regulating valve,
The controller is
A target supply amount of fuel gas to be supplied to the supply air duct is calculated from the differential pressure detected by the supply air differential pressure detection unit, and the supply amount of the fuel gas supplied to the supply air duct is the fuel gas target supply amount. A first control unit that controls the opening of the regulating valve so as to be an amount;
After the opening of the regulating valve is controlled by the first control unit so that the supply amount of the fuel gas supplied to the supply duct becomes the fuel gas target supply amount, the gas differential pressure detection unit Correcting the error between the supply amount of the fuel gas actually supplied to the supply duct and the target supply amount of the fuel gas by correcting the opening of the adjustment valve based on the detected differential pressure A boiler device comprising: a second control unit. The gas differential pressure detector
A differential pressure sensor for detecting a differential pressure between the upstream pressure and the downstream pressure of the fuel gas decompression member;
The boiler device according to claim 1, wherein the second control unit corrects an opening degree of the regulating valve based on a differential pressure detected by the differential pressure sensor. The gas differential pressure detector
A first pressure sensor for detecting a pressure upstream of the fuel gas decompression member;
A second pressure sensor for detecting a pressure downstream of the fuel gas decompression member,
2. The boiler according to claim 1, wherein the second control unit corrects the opening degree of the regulating valve based on a difference between a pressure detected by the first pressure sensor and a pressure detected by the second pressure sensor. apparatus. The second controller is
From the differential pressure detected by the gas differential pressure detector, the fuel gas supply amount supplied to the air supply duct is calculated,
When the difference between the fuel gas supply amount and the fuel gas target supply amount exceeds a predetermined first threshold, the opening of the adjustment valve is reduced, and the fuel gas target supply amount and the fuel gas supply are reduced. The boiler device according to any one of claims 1 to 3, wherein when the difference from the amount exceeds a predetermined second threshold value, the opening degree of the regulating valve is controlled to be increased.

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