JP5987576B2 - Boiler system - Google Patents

Description

  The present invention relates to a boiler system. More specifically, the present invention relates to a closed boiler system that collects drain discharged from load equipment without supplying it to the atmosphere and supplies water to the boiler.

2. Description of the Related Art Conventionally, there has been proposed a boiler system that supplies steam generated by a boiler to a load device, collects drain generated from the steam used as a heat source in the load device, and uses it again as water supply to the boiler.
As a boiler system that collects and uses such drains, an open system that collects drains generated in load equipment in an open drain recovery tank that is open to the atmosphere and supplies water to the boiler, and pressure resistance A closed-type system is known in which drain is recovered in a high-temperature and high-pressure state in a closed drain recovery tank having water, and this drain is supplied to a boiler (see, for example, Patent Document 1).

  In a closed-type boiler system, the recovered drain is supplied to the boiler, and when the amount of recovered drain supplied to the boiler is insufficient, supply water is supplied to the boiler from a supply water line for supply. .

JP 2006-105442 A

By the way, in a closed-type boiler system, high-temperature and high-pressure drain exceeding 100 ° C. is supplied to the boiler by a pump. Here, when the boiler system is configured by a plurality of boilers, combustion of a predetermined boiler may be stopped depending on the state of use of steam by the load device. And in the boiler by which combustion was stopped, since the production | generation of the vapor | steam inside a boiler is stopped, the pressure inside a boiler falls.
When drain is supplied to such a boiler with reduced pressure, the pressure of the drain supply line becomes higher than the pressure inside the boiler, so the flow rate of the pump provided in this supply line is excessive. As a result, cavitation occurs.

  Therefore, an object of the present invention is to provide a closed boiler system that can stably supply water to the boiler even when the pressure inside the boiler is low.

  The present invention is a closed-type boiler system that collects the drain generated by the condensation of steam generated in a boiler and used in a load device, and supplies the drain tank to the boiler, the drain tank and the boiler A drain supply line that supplies the drain accommodated in the drain tank to the boiler, a drain pump that is disposed in the drain supply line, and a downstream side of the drain pump in the drain supply line. A drain supply valve that is open to the atmosphere, stores an open tank that stores makeup water that is supplied to the boiler, a makeup water supply line that connects the open tank and the boiler and supplies makeup water to the boiler, and A makeup water pump arranged in the makeup water supply line and a pressure detection for detecting the pressure inside the boiler A water level detection unit that detects a water level inside the boiler, a water supply instruction unit that instructs water supply to the boiler when the water level detected by the water level detection unit falls below a first water level threshold, and the water supply In the case where water supply to the boiler is instructed by the instruction unit, if the pressure detected by the pressure detection unit is below a predetermined pressure threshold, supply the makeup water to the boiler from the makeup water supply line, It is related with a boiler system provided with the feed water control part which makes the boiler supply the drain from the drain supply line as the pressure detected by the pressure detection part is more than the pressure threshold.

Further, the present invention is a closed-type boiler system that collects the drain generated by agglomeration of steam generated in the boiler and used in the load equipment and supplies the drain tank to the drain tank, and the drain tank A drain supply line that connects the boiler and supplies the drain accommodated in the drain tank to the boiler, a drain pump that is disposed in the drain supply line, and a downstream side of the drain pump in the drain supply line A drain supply valve provided in the open air, an open tank that opens to the atmosphere and stores makeup water that is supplied to the boiler, a makeup water supply line that connects the open tank and the boiler and supplies makeup water to the boiler, , A makeup water pump disposed in the makeup water supply line, and pressure detection for detecting the pressure of the boiler When the water level detector for detecting the water level of the boiler, the opening is large when the pressure of the boiler is high, the pressure of the boiler so that the opening is small when the pressure of the boiler is low A storage unit that associates and stores the opening of the drain supply valve; a water supply instruction unit that instructs water supply to the boiler when the water level detected by the water level detection unit is below a first water level threshold; and When water supply to the boiler is instructed by a water supply instructing unit, a water supply control unit that opens the drain supply valve at an opening stored in the storage unit in association with the pressure detected by the pressure detection unit; It is related with a boiler system provided with.

  The water supply control unit starts water supply from the makeup water supply line to the boiler when the water level detected by the water level detection unit falls below a second water level threshold value lower than the first water level threshold value. It is preferable.

  Moreover, when the said water supply control part starts the water supply to the said boiler from the said makeup water supply line, it is preferable to drive the said makeup water pump.

  The boiler includes a plurality of cans that generate steam, and a steam header in which steam generated from each of the plurality of cans is gathered, and the pressure detection unit and the water level detection unit include the It is preferable to arrange each of the plurality of cans.

  According to the boiler system of the present invention, water can be stably supplied to the boiler even when the pressure inside the boiler is low.

It is a figure showing the composition of the boiler system concerning one embodiment of the present invention. It is a flowchart which shows the operation | movement in the feed water control of a boiler system.

  Hereinafter, preferred embodiments of the boiler system of the present invention will be described with reference to the drawings. The boiler system of the present invention is a closed boiler system that collects drain generated in a load device in a high-pressure and high-pressure state in a pressure-resistant sealed tank and supplies the drain to the boiler.

First, the boiler system 1 of 1st Embodiment is demonstrated.
The boiler system 1 of 1st Embodiment is provided with the boiler 10, the load apparatus 20, the drain tank 30, and the open tank 40 as shown in FIG.

  In addition, the boiler system 1 connects these devices, a plurality of lines through which steam or water flows, a plurality of valves that open and close the plurality of lines, a plurality of pumps arranged in a predetermined line, and a plurality of these A control device 9 that controls the operation of a valve, a plurality of pumps, and the like is provided. Specifically, the boiler system 1 includes, as lines, a first steam supply line L1, a first drain supply line L2, a second drain supply line L3 as a drain supply line of the present invention, and a second steam supply line. L4, a flash steam discharge line L5, a first makeup water supply line L6 as a makeup water supply line of the present invention, a second makeup water supply line L7, and a drain circulation line L8. Further, the plurality of valves controlled by the control device 9 include a drain supply valve 32 and a makeup water supply valve 63 which will be described later, and the plurality of pumps include a drain pump 31 and a makeup water pump 61.

The boiler 10 includes a plurality of can bodies 11 that generate steam, a steam header 12 that collects steam generated by the plurality of can bodies 11, and a connecting pipe that connects the plurality of can bodies 11 and the steam header 12. 13, and a pressure sensor 14 as a pressure detection unit and a water level sensor 15 as a water level detection unit provided in each of the plurality of cans 11.
The plurality of can bodies 11 generate steam by heating the water supplied to these can bodies 11. The steam generated in the plurality of cans 11 is supplied to the steam header 12 through the connecting pipe 13.
The pressure sensor 14 detects the pressure inside the boiler 10 (can 11). The water level sensor 15 detects the water level inside the boiler 10 (can 11).

The load device 20 uses the steam generated in the boiler 10 as a heat source, and performs heat exchange with the object to be heated.
The drain tank 30 collects and stores the drain produced by agglomeration of a part of the steam used for heat exchange in the load device 20. The drain tank 30 is constituted by a pressure vessel that has pressure resistance and can be sealed.

  The open tank 40 is open to the atmosphere. The open tank 40 stores makeup water supplied to the boiler 10. The open tank 40 is introduced with flash steam generated from the drain in the drain tank 30.

The first steam supply line L <b> 1 connects the steam header 12 and the load device 20 and supplies the steam generated by the boiler 10 to the load device 20.
The first drain supply line L <b> 2 connects the load device 20 and the drain tank 30, and supplies the drain generated in the load device 20 to the drain tank 30. In the first drain supply line L2, a steam trap 21, a check valve 22, and a motor valve 23 that discharge drain generated in the load device 20 and prevent discharge of steam are arranged.

  The second drain supply line L3 connects the drain tank 30 and the boiler 10 and supplies the drain accommodated in the drain tank 30 to the boiler 10. In the first embodiment, the upstream end of the second drain supply line L <b> 3 is connected to the lower portion of the drain tank 30. Further, the downstream side of the second drain supply line L3 is branched so as to be connected to each of the plurality of cans 11.

A drain pump 31 and a drain supply valve 32 are arranged in the second drain supply line L3.
The drain pump 31 boosts the drain supplied from the drain tank 30 and supplies it to the boiler 10.
The drain supply valve 32 is constituted by a motor valve, and opening and closing of the drain supply valve 32 is controlled by a control unit 91 described later.
In the first embodiment, the drain pump 31 is disposed on the upstream side of the branch portion in the second drain supply line L3. Further, the drain supply valve 32 is provided on the downstream side of the drain pump 31. More specifically, the drain supply valve 32 is disposed on the downstream side of the branch portion in the second drain supply line L3, and a plurality of drain supply valves 32 are provided corresponding to the plurality of can bodies 11.

  The second steam supply line L4 connects the steam header 12 and the drain tank 30. The second steam supply line L4 supplies steam generated in the boiler 10 to the drain tank 30 and adjusts the pressure inside the drain tank 30. A pressure regulating valve 41 and a motor valve 42 are disposed in the second steam supply line L4.

  The flash steam discharge line L5 connects the drain tank 30 and the open tank 40, and discharges the flash steam generated in the drain tank 30 to the open tank 40. A pressure regulating valve 51 is disposed in the flash steam discharge line L5. When the pressure inside the drain tank 30 exceeds a predetermined pressure, the pressure regulating valve 51 releases the flash vapor to the open tank 40 side and reduces the pressure inside the drain tank 30.

  The first makeup water supply line L6 connects the open tank 40 and the boiler 10. The first makeup water supply line L6 supplies water stored in the open tank 40 to the boiler 10 as makeup water. In the first embodiment, the upstream end portion of the first makeup water supply line L6 is connected to the lower portion of the open tank 40. Further, the downstream side of the first makeup water supply line L <b> 6 branches so as to be connected to each of the plurality of can bodies 11.

A makeup water pump 61, a check valve 62, and a makeup water supply valve 63 are arranged in the first makeup water supply line L6.
The makeup water pump 61 boosts the makeup water supplied from the open tank 40 and supplies it to the boiler 10.
The check valve 62 is disposed on the downstream side of the makeup water pump 61. This check valve 62 allows the supply of makeup water from the open tank 40 side to the boiler 10 side, and blocks the circulation of makeup water from the boiler 10 side to the open tank 40 side.
The makeup water supply valve 63 is disposed on the downstream side of the check valve 62.

  In the first embodiment, the makeup water pump 61, the check valve 62, and the makeup water supply valve 63 are arranged on the downstream side of the branch portion in the first makeup water supply line L6, and correspond to the plurality of can bodies 11. Are provided.

  The second makeup water supply line L7 connects the open tank 40 and the drain tank 30 and supplies water stored in the open tank 40 to the drain tank 30. A pump 71 is disposed in the second makeup water supply line L7.

  The drain circulation line L8 connects the second drain supply line L3 and the drain tank 30. More specifically, the upstream end of the drain circulation line L8 is connected between the drain pump 31 and the branch portion in the second drain supply line L3. The downstream end of the drain circulation line L8 is branched into a line connected to the upper part of the drain tank 30 and a line connected to the lower part of the drain tank 30. A motor valve 81 is disposed on the line connected to the upper portion of the drain tank 30, and an orifice 82 is disposed on the line connected to the lower portion of the drain tank 30.

  The drain circulation line L8 returns a part or all of the drain flowing through the second drain supply line L3 to the drain tank 30. More specifically, from the line connected to the lower part of the drain tank 30, the drain is circulated to the liquid phase part of the drain tank 30, and from the line connected to the upper part of the drain tank 30, the gas phase of the drain tank 30 is Drain is circulated in the part. In the drain circulation line L8, the flow rate of the drain circulated to the liquid phase part is adjusted by the orifice 82, and the temperature of the drain stored in the drain tank 30 is made uniform, while the drain circulated to the gas phase part is used. The flash steam generated inside the drain tank 30 is recovered.

The control device 9 controls water supply to the boiler 10 based on the pressure detected by the pressure sensor 14 provided in the boiler 10 and the water level detected by the water level sensor 15.
The control device 9 includes a microprocessor including a CPU as the control unit 91 and a memory as the storage unit 92.

In the first embodiment, the storage unit 92 stores a pressure threshold value and a first water level threshold value that are set as determination criteria for water supply control in the boiler system 1.
More specifically, the pressure threshold value is a threshold value that serves as a criterion for determining whether to supply water from the second drain supply line L3 or to supply water from the first makeup water supply line L6 when supplying water to the boiler 10. Is set. The first water level threshold value is set as a threshold value that serves as a determination criterion for supplying water to the boiler 10. The first water level threshold is set in association with the combustion state of the boiler 10, and the higher the combustion state of the boiler 10, the lower the first water level threshold, and the lower the combustion state of the boiler 10, the first. The water level threshold is set high.

The control unit 91 includes a water supply instruction unit 911 and a water supply control unit 912.
The water supply instruction unit 911 instructs water supply to the boiler 10 when the water level detected by the water level sensor 15 falls below the first water level threshold value stored in the storage unit 92. Specifically, the water supply instructing unit 911 monitors the water level detected by the water level sensor 15 provided in each of the plurality of can bodies 11, and for the can body 11 in which the water level below the first water level threshold is detected. Instruct water supply.

In the water supply control unit 912, when water supply to the boiler 10 is instructed by the water supply instruction unit 911, the internal pressure of the boiler 10 detected by the pressure sensor 14 falls below the pressure threshold value stored in the storage unit 92. If so, make-up water is supplied from the open tank 40 to the boiler 10 through the first make-up water supply line L6.
Specifically, in the water supply control unit 912, the internal pressure of the boiler 10 (can body 11) detected by the pressure sensor 14 provided in the can body 11 instructed to supply water is stored in the storage unit 92. When the pressure is below the threshold value, the makeup water pump 61 that supplies makeup water to the can 11 is driven to supply makeup water to the can 11 from the first makeup water supply line L6. In this case, the water supply control unit 912 maintains the closed state of the drain supply valve 32.

In addition, the water supply control unit 912 is configured such that, when the water supply instruction unit 911 instructs water supply to the boiler 10, the pressure inside the boiler 10 detected by the pressure sensor 14 is equal to or greater than the pressure threshold stored in the storage unit 92. If so, drain is supplied to the boiler 10 from the drain tank 30 through the second drain supply line L3.
Specifically, in the water supply control unit 912, the internal pressure of the boiler 10 (can body 11) detected by the pressure sensor 14 provided in the can body 11 instructed to supply water is stored in the storage unit 92. When it is more than a pressure threshold value, the drain supply valve 32 provided in the line which supplies a drain to the said can 11 is opened, and a drain is supplied to the can 11 from the 2nd drain supply line L3. In this case, the water supply controller 912 maintains the state where the drive of the makeup water pump 61 is stopped.

  In the boiler system 1 of the first embodiment, the drain pump 31 is always driven, and the supply of the drain to the boiler 10 is adjusted by opening and closing the drain supply valve 32. In a state where the drain supply valve 32 is closed, the drain that flows through the second drain supply line L3 is supplied again to the drain tank 30 through the drain circulation line L8.

  Next, the flow of water supply control to the boiler 10 in the boiler system 1 of the first embodiment will be described with reference to FIG. FIG. 2 is a flowchart showing an operation related to water supply control in the boiler system 1 of the first embodiment.

  First, in step ST <b> 1, the control unit 91 determines whether the water levels of the plurality of cans 11 measured by the water level sensor 15 are below the first water level threshold. When it is determined by the control unit 91 that the water level of the can 11 is below the first water level threshold, the process proceeds to step ST2. When it is determined by the control unit 91 that the water level of the can 11 is not lower than the first threshold (greater than or equal to the first threshold), the process returns to step ST1.

  In step ST2, the water supply instructing unit 911 instructs water supply to the can body 11 whose water level is lower than the first water level threshold, and the process proceeds to step ST3.

  In step ST3, the water supply control unit 912 determines whether the pressure of the can 11 detected by the pressure sensor 14 is below the pressure threshold. If the water supply control unit 912 determines that the pressure of the can 11 is below the pressure threshold, the process proceeds to step ST4. When it is determined by the water supply control unit 912 that the pressure of the can 11 is not lower than the pressure threshold (is equal to or higher than the pressure threshold), the process proceeds to step ST5.

  In step ST4, the water supply control unit 912 drives the supply water pump 61 that supplies supply water to the can body 11 that is instructed to supply water to supply supply water to the can body 11 from the first supply water supply line L6. The process ends.

  In step ST5, the water supply control unit 912 opens the drain supply valve 32 provided in the line for supplying drain to the can body 11 instructed to supply water, and supplies the drain to the can body 11 from the second drain supply line L3. Supply and finish the process.

  According to the boiler system 1 of 1st Embodiment demonstrated above, there exist the following effects.

  (1) The boiler system 1 includes a pressure sensor 14 that detects the pressure inside the boiler 10, a water level sensor 15 that detects the water level inside the boiler 10, a water supply instruction unit 911, and a water supply control unit 912. The water supply instruction unit 911 is instructed to supply water to the boiler 10 when the water level detected by the water level sensor 15 falls below the first water level threshold. When the water supply control unit 912 is instructed to supply water to the boiler 10 by the water supply instruction unit 911, supply water to the boiler 10 is supplied from the open tank 40 to the boiler 10 if the pressure inside the boiler 10 is below the pressure threshold. When the pressure inside the boiler 10 is equal to or higher than the pressure threshold, the drain is supplied from the drain tank 30 to the boiler 10. Thereby, when the pressure inside the boiler 10 instructed to supply water is low, the makeup water from the open tank 40 can be supplied to the boiler 10, so that the drain is supplied to the boiler in a state where the pressure is reduced. Can prevent the occurrence of cavitation. Therefore, water can be stably supplied to the boiler 10 even when the pressure inside the boiler 10 is low.

  (2) When the makeup water pump 61 and the check valve 62 are arranged in the first makeup water supply line L6 and water supply from the first makeup water supply line L6 to the boiler 10 is started, the makeup water pump 61 is driven. It was. Accordingly, by controlling only the driving of the makeup water pump 61, the water supply from the first makeup water supply line L6 to the boiler 10 can be controlled, so that the control of the boiler system 1 can be made more efficient.

  (3) The boiler 10 includes a plurality of can bodies 11 and a steam header 12 in which steam generated from each of the plurality of can bodies is assembled, and a plurality of pressure sensors 14 and water level sensors 15 are provided. Each can body 11 was placed. Thereby, in the boiler 10 provided with the some can body 11, according to the pressure of each can body 11, since the water supply of drain or the water supply from the open tank 40 can be determined for every can body 11, the some can body 11 In the boiler system 1 having the above, water supply control can be suitably performed.

  Next, the configuration of the boiler system according to the second embodiment of the present invention will be described. In the description of the second embodiment, the same components are denoted by the same reference numerals, and the description thereof is omitted or simplified.

In 2nd Embodiment, it replaces with the control which mainly supplies water from the open tank 40 according to the pressure of the boiler 10, and is the point which performs the control which adjusts the opening degree of the drain supply valve 32 according to the pressure of the boiler 10. This is different from the first embodiment.
In the second embodiment, the storage unit 92 stores the pressure inside the boiler 10 and the opening of the drain supply valve 32 in association with each other. In addition to the first water level threshold value, the storage unit 92 stores a second water level threshold value set as a water level threshold value lower than the first water level threshold value.

  And in 2nd Embodiment, when the water supply instruction | indication part 911 instruct | indicates the water supply to the boiler 10, in the 2nd Embodiment, from the value of the pressure inside the boiler 10 detected by the pressure sensor 14, the said water pressure control part 912 The opening degree of the drain supply valve 32 that is associated and stored in the storage unit 92 is referred to. And the water supply control part 912 opens the drain supply valve 32 by the opening degree linked | related with the value of the pressure inside the boiler 10. FIG. Specifically, when the pressure detected by the pressure sensor 14 is high, the opening degree of the drain supply valve 32 is increased, and when the pressure detected by the pressure sensor 14 is low, the drain supply valve 32 is opened. The degree becomes smaller.

  Note that the opening degree of the drain supply valve 32 may be changed stepwise corresponding to a plurality of pressure values, or may be changed continuously according to the pressure detected by the pressure sensor 14.

  In the second embodiment, the water supply control unit 912 starts water supply from the first makeup water supply line L6 to the boiler 10 when the water level detected by the water level sensor 15 falls below the second water level threshold. Let

  That is, in the second embodiment, when the pressure of the boiler 10 (can body 11) instructed to supply water is low, the opening of the drain supply valve 32 becomes small, so that the drain is supplied to the can body 11 per unit time. The amount is reduced. Therefore, in such a case, the water level of the can 11 that is instructed to supply water may further decrease. Therefore, when the water level detected by the water level sensor 15 falls below the second water level threshold, the water supply control unit 912 starts water supply to the boiler 10 from the first makeup water supply line L6. It can prevent that the water level of 11 falls excessively.

  According to the boiler system 1 of 2nd Embodiment demonstrated above, there exist the following effects besides having the effect of (1)-(3) mentioned above.

  (4) The storage unit 92 stores the pressure of the boiler 10 and the opening of the drain supply valve 32 in association with each other, and the water supply control unit 912 stores the storage unit 92 in association with the detected pressure value of the boiler 10. The drain supply valve 32 was opened at the opening degree. Thereby, since the flow volume which supplies a drain according to the pressure inside the boiler 10 is controllable, when the pressure inside the boiler 10 is low, by reducing the flow volume of the drain supplied to the boiler 10, drain is reduced. The pressure on the downstream side of the pump 31 can be secured, and the occurrence of cavitation can be prevented.

  (5) When the pressure of the boiler 10 (can body 11) instructed to supply water is low, the opening of the drain supply valve 32 becomes small, so that the supply amount of drain to the can body 11 per unit time decreases. Therefore, in such a case, the water level of the can 11 that is instructed to supply water may further decrease. Therefore, when the water level detected by the water level sensor 15 falls below the second water level threshold, the water supply control unit 912 starts water supply to the boiler 10 from the first makeup water supply line L6. Thereby, even if it is a case where the opening degree of the drain supply valve 32 is adjusted according to the pressure of the boiler 10, it can prevent that the water level of the can 11 falls excessively.

As mentioned above, although each preferred embodiment of the boiler system of the present invention was described, the present invention is not limited to the embodiment mentioned above, and can be changed suitably.
For example, in the first embodiment, when water supply from the first makeup water supply line L6 to the boiler 10 is started, the makeup water pump 61 is driven, but this is not a limitation. That is, the make-up water supply valve may be constituted by a motor valve, and when the water supply from the first make-up water supply line L6 to the boiler 10 is started, the make-up water control unit may open the make-up water supply valve.

DESCRIPTION OF SYMBOLS 1 Boiler system 10 Boiler 11 Can body 12 Steam header 14 Pressure sensor (pressure detection part)
15 Water level sensor (water level detector)
31 Drain pump 32 Drain supply valve 40 Open tank 61 Replenishment water pump 911 Water supply instruction section 912 Water supply control section 92 Storage section L3 Second drain supply line (drain supply line)
L6 First make-up water supply line (make-up water supply line)

Claims (5)

A closed-type boiler system that collects the drain produced by condensing steam generated in the boiler and used in the load equipment into a drain tank and supplies it to the boiler,
A drain supply line for connecting the drain tank and the boiler, and supplying a drain accommodated in the drain tank to the boiler;
A drain pump disposed in the drain supply line;
A drain supply valve provided downstream of the drain pump in the drain supply line;
An open tank that is open to the atmosphere and stores makeup water supplied to the boiler;
A makeup water supply line for connecting the open tank and the boiler and supplying makeup water to the boiler;
A makeup water pump disposed in the makeup water supply line;
A pressure detector for detecting the pressure inside the boiler;
A water level detector for detecting the water level inside the boiler;
A water supply instruction unit for instructing water supply to the boiler when the water level detected by the water level detection unit falls below a first water level threshold;
When water supply to the boiler is instructed by the water supply instruction unit,
When the pressure detected by the pressure detection unit is below a predetermined pressure threshold, make the boiler supply makeup water from the makeup water supply line,
A boiler system comprising: a water supply controller configured to supply drain to the boiler from the drain supply line when the pressure detected by the pressure detector is equal to or greater than the pressure threshold. A closed-type boiler system that collects the drain produced by condensing steam generated in the boiler and used in the load equipment into a drain tank and supplies it to the boiler,
A drain supply line for connecting the drain tank and the boiler, and supplying a drain accommodated in the drain tank to the boiler;
A drain pump disposed in the drain supply line;
A drain supply valve provided downstream of the drain pump in the drain supply line;
An open tank that is open to the atmosphere and stores makeup water supplied to the boiler;
A makeup water supply line for connecting the open tank and the boiler and supplying makeup water to the boiler;
A makeup water pump disposed in the makeup water supply line;
A pressure detector for detecting the pressure of the boiler;
A water level detection unit for detecting the water level of the boiler;
A memory that associates and stores the pressure of the boiler and the opening of the drain supply valve so that the opening is increased when the pressure of the boiler is high, and the opening is decreased when the pressure of the boiler is low. And
A water supply instruction unit for instructing water supply to the boiler when the water level detected by the water level detection unit falls below a first water level threshold;
A water supply control unit that opens the drain supply valve at an opening stored in the storage unit in association with the pressure detected by the pressure detection unit when water supply to the boiler is instructed by the water supply instruction unit; A boiler system.   The said water supply control part starts the water supply to the said boiler from the said makeup water supply line, when the water level detected by the said water level detection part is less than the 2nd water level threshold value lower than the said 1st water level threshold value. 2. The boiler system according to 2.   The boiler system according to any one of claims 1 to 3, wherein the water supply control unit drives the makeup water pump when water supply to the boiler from the makeup water supply line is started. The boiler includes a plurality of cans that generate steam, and a steam header in which steam generated from each of the plurality of cans is collected,
The boiler system according to any one of claims 1 to 4, wherein the pressure detection unit and the water level detection unit are arranged in each of the plurality of cans.

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