JP2015098989A - Boiler system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a boiler system that inhibits feed water to a boiler from running short.SOLUTION: A boiler system 1 includes: a boiler 10; a drain tank 20 for recovering drain W1; a drain supply line L1 for connecting the drain tank 20 and the boiler 10 with each other; a drain flow rate detection section 31 for detecting a flow rate of the drain W1 to be supplied to the boiler 10; a first feed water valve 51 for controlling the flow rate of the drain W1; a make-up water supply line L2 for supplying make-up water to the boiler 10; a second feed water valve 52 for opening or closing the make-up water supply line L2; and a control section 70 for controlling an opening of the first feed water valve 51 on the basis of the flow rate of the drain W1 detected by the drain flow rate detection section 31 and for performing control to close the first feed water valve 51 and open the second feed water valve 52 when the flow rate of the drain W1 detected by the drain flow rate detection section 31 is lowered or when an abnormality of the first feed water valve 51 is detected.

Description

  The present invention relates to a boiler system that collects drain discharged from a load device and supplies the drain to a boiler.

  Conventionally, it has a drain recovery system that supplies steam generated by the boiler to the load equipment, collects the drain generated by condensation of the steam used as a heat source in the load equipment, and collects the drain in the drain tank and supplies it to the boiler again. A boiler system has been proposed (see, for example, Patent Document 1).

JP 2006-105442 A

  By the way, in the drain recovery system, abnormalities may occur in the opening / closing operation of the valve due to the biting of foreign matter in the valve body of the valve arranged in the drain supply line and the error of the electrical signal related to the opening / closing operation of the valve. In this case, the supply of drain water supplied to the boiler via the drain supply line is insufficient. In order to prevent this, a boiler system that supplies drain water includes a makeup water supply line that supplies makeup water to the boiler. When detecting that the water level in the drain tank has fallen below the set water level, the boiler system closes a valve disposed in the drain supply line of the drain recovery system. And a boiler system opens the valve | bulb arrange | positioned at a makeup water supply line, distributes makeup water to a makeup water supply line, and supplies it to a boiler. However, the supply of drain and makeup water to the boiler is not performed until the supply of makeup water to the boiler is started after the valve disposed in the drain supply line of the drain recovery system is closed. At this time, the boiler may be in a low water level state, and safety control may be activated to stop operation. In that case, there arises a problem that the supply of steam from the boiler to the load device is stopped.

  An object of this invention is to provide the boiler system which suppresses that the water supply to a boiler runs short.

  The present invention provides a boiler that generates steam and supplies the generated steam to a load device, a drain tank that collects drain generated by the load device using the steam, the drain tank, and the A boiler supply system that connects a boiler and supplies the drain accommodated in the drain tank to the boiler, and is disposed in the drain supply line and is supplied to the boiler A drain flow rate detection unit that detects the flow rate, a first water supply valve that is disposed in the drain supply line and adjusts the flow rate of the drain supplied to the boiler, a makeup water supply line that supplies makeup water to the boiler, A second water supply valve which is disposed in the makeup water supply line and opens or closes the makeup water supply line and is detected by the drain flow rate detection unit. The opening degree of the first water supply valve is controlled based on the flow rate of the drain, and the abnormality of the first water supply valve is detected when the flow rate of the drain detected by the drain flow rate detection unit decreases. And a control unit that performs control to close the first water supply valve and open the second water supply valve.

  In the boiler system of the present invention, it is preferable that the control unit performs control to open and close the first water supply valve a plurality of times when an abnormality of the first water supply valve is detected.

  In the boiler system of the present invention, when the controller detects an abnormality of the first water supply valve, the abnormality detection is not canceled even if the first water supply valve is opened and closed a plurality of times. It is preferable to perform control to close the first water supply valve and open the second water supply valve.

  ADVANTAGE OF THE INVENTION According to the boiler system of this invention, the boiler system which suppresses that the water supply to a boiler runs short can be provided.

It is a figure showing composition of a boiler system concerning an embodiment of the present invention. It is a flowchart explaining the operation | movement shown in 1st Embodiment of a boiler system. It is a flowchart explaining the operation | movement shown in 2nd Embodiment of a boiler system.

Hereinafter, preferred embodiments of the boiler system of the present invention will be described with reference to the drawings.
First, the configuration of the boiler system 1 will be described with reference to FIG. FIG. 1 is a diagram showing a configuration of a boiler system 1 according to an embodiment of the present invention. In the following description, “line” is a general term for a flow path, a path, a pipeline, and the like.

  As shown in FIG. 1, the boiler system 1 of the present embodiment includes a boiler 10, a steam header 11, a load device 12, a drain tank 20, a drain flow meter 31 as a drain flow rate detection unit, and a makeup water flow rate. A total of 32, a water supply pump 40, a first check valve 61, and a second check valve 62 are provided.

  In addition, the boiler system 1 includes a plurality of lines that connect these devices and distribute the drain W1 or the makeup water W2, and a plurality of valves that open and close the plurality of lines or adjust the flow rate of the drain W1 that circulates the lines. And a control unit 70 that controls operations of the plurality of valves. Specifically, the boiler system 1 includes a drain supply line L1, a makeup water supply line L2, a steam supply line L3, and a drain line L4 as lines. Moreover, the boiler system 1 is provided with the 1st water supply valve 51, the 2nd water supply valve 52, and the 3rd water supply valve 53 as a valve | bulb.

  The boiler 10 includes a can body 2, a blower 3, a duct 4, an exhaust pipe 5, a separator 6, and a water level detector (not shown). In the boiler 10, the combustion air G <b> 1 is supplied from the blower 3, and the fuel gas (not shown) is mixed with the combustion air G <b> 1 in the duct 4, burned in the can body 2, and the upper portion in the can body 2. A number of water pipes connecting the header and the lower header are heated. The exhaust gas G2 after combustion is discharged from the exhaust cylinder 5 to the outside. The steam is taken out from the separator 6 by opening the main steam valve 9, and is supplied to the steam header 11 through the steam supply line L3. The water level detector (not shown) detects the water level of the boiler 10 and is electrically connected to the control unit 70.

  One end of the steam supply line L3 is connected to the separator 6 of the boiler 10, and the other end of the steam supply line L3 is connected to the load device 12. A main steam valve 9 and a steam header 11 are provided in the middle of the steam supply line L3. The steam supply line L3 is a line that supplies the steam W3 generated in the water pipe to the load device 12 via the steam header 11.

  One end of the drain line L4 is connected to the load device 12, and the other end of the drain line L4 is connected to the drain tank 20. The drain line L4 is a line for sending the drain W1 discharged from the load device 12 to the drain tank 20. The drain line L4 is provided with a steam trap (not shown) that discharges only the drain W1 without causing the steam to flow out.

  The steam header 11 is a device that temporarily stores the steam W3 supplied from the boiler 10 via the steam supply line L3 and supplies the steam W3 to the load device 12 that uses the steam W3. The steam header 11 is provided between the boiler 10 and the load device 12 in the steam supply line L3.

  The load device 12 is a device (for example, a heat exchanger) that operates with the steam W3 supplied from the boiler 10. The steam W3 used in the load device 12 is deprived of heat and condensed to be drained W1. The drain W1 discharged from the load device 12 is collected in the drain tank 20 via the drain line L4.

  The drain tank 20 collects and stores the drain W1 generated by agglomeration of a part of the steam used for heat exchange in the load device. The drain tank 20 is composed of a pressure vessel that has pressure resistance and can be sealed.

One end of the drain supply line L <b> 1 is connected to the drain tank 20, and the other end of the drain supply line L <b> 1 is connected to the lower header of the boiler 10. In the drain supply line L1, as shown in FIG. 1, in order from the upstream side, a third water supply valve 53, a drain flow meter 31, a first water supply valve 51, a first check valve 61, and a second reverse valve. A stop valve 62 is provided.
The drain W1 accommodated in the drain tank 20 is supplied to the boiler 10 through the drain supply line L1.

  One end of the makeup water supply line L2 is connected to a water supply tank (not shown). The other end of the makeup water supply line L2 is connected to a line connection portion J1 provided between the first check valve 61 and the second check valve 62 in the drain supply line L1. The makeup water W2 is boosted by the feed water pump 40, then flows through the makeup water supply line L2, and is supplied toward the line connection portion J1. The makeup water W2 that has circulated through the makeup water supply line L2 is circulated from the line connection portion J1 through the drain supply line L1 and supplied to the boiler 10.

  A drain flow meter 31 as a drain flow rate detection unit detects the flow rate of the drain W1 supplied from the drain tank 20 to the boiler 10 via the drain supply line L1. The drain flow meter 31 outputs an information signal of the detected flow rate of the drain W1 to the control unit 70.

  The makeup water flow meter 32 detects the flow rate of the makeup water W2 supplied to the boiler 10 via the makeup water supply line L2. The feed water pump 40 is provided on the upstream side of the make-up water flow meter 32 in the make-up water supply line L2, and boosts the make-up water W2 and supplies it to the boiler 10. The operation and stop of the feed water pump 40 are controlled by the control unit 70.

  The first check valve 61 is provided between the drain flow meter 31 and the line connection portion J1 in the drain supply line L1, and prevents the backflow of the drain W1. The second check valve 62 is provided on the downstream side of the line connection portion J1 in the drain supply line L1, and prevents the backflow of the drain W1 and the makeup water W2.

In this embodiment, the 1st water supply valve 51, the 2nd water supply valve 52, and the 3rd water supply valve 53 are comprised by the motor valve.
The first water supply valve 51 includes an overcurrent detection sensor (not shown), and is provided between the drain flow meter 31 and the first check valve 61 in the drain supply line L1. The 1st water supply valve 51 adjusts the opening degree of a valve body, and enables the flow volume of the drain W1 supplied to the boiler 10 from the drain tank 20 to be adjustable. The first water supply valve 51 is electrically connected to the control unit 70. The opening degree of the first water supply valve 51 is controlled by the control unit 70.

  The second water supply valve 52 includes an overcurrent detection sensor (not shown), and is provided between the makeup water flow meter 32 and the line connection portion J1 in the makeup water supply line L2. The second water supply valve 52 is electrically connected to the control unit 70. The second water supply valve 52 is in an open state in which makeup water W2 boosted by the feed water pump 40 is circulated through the makeup water supply line L2 and supplied to the boiler 10, and makeup water W2 boosted by the feed water pump 40 is supplied to the makeup water. It can be switched to a closed state in which the boiler 10 is not supplied to the supply line L2 and is not supplied to the boiler 10. The second water supply valve 52 is controlled to be switched between an open state and a closed state by the control unit 70.

  The third water supply valve 53 is provided between the drain tank 20 and the drain flow meter 31 in the drain supply line L1. The third water supply valve 53 has an open state in which the drain W1 accommodated in the drain tank 20 is circulated through the drain supply line L1 and supplied to the boiler 10, and the drain W1 accommodated in the drain tank 20 is supplied to the drain supply line L1. It is configured to be switchable to a closed state in which the boiler 10 is not distributed and is not supplied to the boiler 10.

  The control unit 70 is configured to be able to control the first water supply valve 51, the second water supply valve 52, the third water supply valve 53, and the water supply pump 40.

  The control unit 70 controls the opening degree of the valve body of the first water supply valve 51 based on the flow rate of the drain W <b> 1 detected by the drain flow meter 31. When the control unit 70 detects that the flow rate of the drain W1 detected by the drain flow meter 31 is below a predetermined threshold, or the overcurrent detection sensor (not shown) of the first water supply valve 51 is a predetermined value. When the electric current more than a threshold value is detected, control which closes the 1st water supply valve 51 and the 3rd water supply valve 53, and opens the 2nd water supply valve 52 is performed. The controller 70 switches the feed water pump 40 on and off based on the water level of the boiler 10 detected by a water level detector (not shown). For example, when it is detected that the water level of the boiler 10 detected by a water level detector (not shown) is equal to or higher than the first water level, the control unit 70 performs control to turn off the water supply pump 40. When the controller 70 detects that the water level of the boiler 10 detected by a water level detector (not shown) is equal to or lower than the second water level lower than the first water level, the control unit 70 turns on the water supply pump 40. I do.

  The first water supply valve 51 generates an overcurrent due to foreign matter biting or an error in an electric signal related to the opening / closing operation of the valve. The control part 70 performs control which opens and closes the 1st water supply valve 51 in multiple times, when the overcurrent detection sensor (not shown) of the 1st water supply valve 51 detects the electric current more than a predetermined threshold value.

  Further, the control unit 70 continues even if the first water supply valve 51 is opened and closed a plurality of times when an overcurrent detection sensor (not shown) of the first water supply valve 51 detects a current exceeding a predetermined threshold value. When it is detected that the current in the first water supply valve 51 is equal to or greater than a predetermined threshold, the first water supply valve 51 and the third water supply valve 53 are closed and the second water supply valve 52 is opened. .

  The boiler system 1 having the above configuration operates as shown in the following first embodiment. FIG. 2 is a flowchart for explaining the operation shown in the first embodiment of the boiler system.

  In the first embodiment, first, in step S11, the boiler system 1 receives an operation start instruction. The boiler 10 in the boiler system 1 mixes combustion air G1 and fuel gas (not shown) in the duct 4 and starts combustion in the can body 2. The control part 70 in the boiler system 1 controls each part so that it may become a normal driving | running state. For example, the control unit 70 closes the second water supply valve 52, and based on the information signal of the flow rate detected by the drain flow meter 31 for the drain W1 flowing through the drain supply line L1, the first water supply valve The opening degree of the valve body 51 is adjusted. At this time, the third water supply valve 53 is open.

Subsequently, in step S12, the control unit 70 determines whether or not the flow rate of the drain W1 in the drain supply line L1 is below a predetermined threshold based on the flow rate information signal detected by the drain flow meter 31 for the drain W1. Is detected.
When the control unit 70 detects that the flow rate of the drain W1 in the drain supply line L1 is below a predetermined threshold (step S12: YES), the control unit 70 advances the process to step S13. Moreover, the control part 70 returns a process to step S12, when not detecting that the flow volume of the drain W1 in the drain supply line L1 is less than a predetermined threshold value (step S12: NO).

  Next, in step S13, the control unit 70 closes the first water supply valve 51 and the third water supply valve 53, opens the second water supply valve 52, and supplies makeup water W2 to the boiler 10. Switch to a possible state.

Subsequently, in step S14, the controller 70 determines that the water level of the boiler 10 is lower than the first water level based on the information signal about the water level of the boiler 10 detected by the water level detector (not shown) of the boiler 10. Detect whether the water level is 2 or less.
Control part 70 advances processing to Step S15, when it detects that the water level of boiler 10 is below the 2nd water level (Step S14: YES). Moreover, the control part 70 returns a process to step S14, when not detecting that the water level of the boiler 10 is below a 2nd water level (step S14: NO).

  Next, in step S <b> 15, the control unit 70 turns on the water supply pump 40 and operates the water supply pump 40. Thus, the makeup water W2 is boosted by the feed water pump 40, flows through the makeup water supply line L2, and is supplied to the line connection portion J1. The makeup water W2 that has circulated through the makeup water supply line L2 is circulated from the line connection portion J1 through the drain supply line L1 and supplied to the boiler 10.

Subsequently, in step S16, the control unit 70 determines whether the water level of the boiler 10 is equal to or higher than the first water level based on the information signal about the water level of the boiler 10 detected by the water level detector (not shown) of the boiler 10. Detect whether or not.
Control part 70 advances processing to Step S17, when it detects that the water level of boiler 10 is more than the 1st water level (Step S16: YES). Moreover, the control part 70 returns a process to step S16, when not detecting that the water level of the boiler 10 is more than a 1st water level (step S16: NO).

  Next, in step S <b> 17, the control unit 70 turns off the feed water pump 40 and stops the supply of the makeup water W <b> 2 to the boiler 10.

Subsequently, in step S18, the control unit 70 confirms whether or not an operation stop instruction has been received.
When the control unit 70 has not received an instruction to stop the operation (step S18: NO), the control unit 70 returns the process to step S14. Moreover, the control part 70 controls each part so that the driving | operation of the boiler system 1 may be stopped, when the instruction | indication of a driving | operation stop is received (step S18: YES).

  The boiler system 1 operates as shown in the second embodiment below. FIG. 3 is a flowchart for explaining the operation shown in the second embodiment of the boiler system.

  About the structure of the boiler system 1 in 2nd Embodiment, since it is the same as 1st Embodiment, it shows with the same code | symbol and abbreviate | omits description.

  In the second embodiment, first, in step S21, the boiler system 1 receives an operation start instruction.

Subsequently, in step S22, the control unit 70 performs the first operation based on the electrical signal about the opening / closing operation of the first water supply valve 51 detected by the overcurrent detection sensor (not shown) of the first water supply valve 51. It is detected whether or not an overcurrent flows through the water supply valve 51.
Control part 70 advances processing to Step S23, when detecting that overcurrent flows into the 1st water supply valve 51 (Step S22: YES). Moreover, the control part 70 advances a process to step S25, when not detecting that the overcurrent is flowing into the 1st water supply valve 51 (step S22: NO).

  Next, in step S23, the control unit 70 opens and closes the first water supply valve 51 a plurality of times.

Subsequently, in step S24, the first water supply valve 51 is switched to the first water supply valve 51 based on the electrical signal about the opening / closing operation of the first water supply valve 51 detected by the overcurrent detection sensor (not shown) of the first water supply valve 51. Detects whether overcurrent is flowing.
When the control unit 70 detects that an overcurrent flows through the first water supply valve 51 (step S24: YES), the control unit 70 advances the process to step S13 in the first embodiment. The processes after step S13 are the same as those in the first embodiment. Moreover, the control part 70 advances a process to step S25, when not detecting that the overcurrent is flowing into the 1st water supply valve 51 (step S24: NO).

On the other hand, in step S25, the control unit 70 determines whether or not the flow rate of the drain W1 in the drain supply line L1 is below a predetermined threshold based on the flow rate information signal detected by the drain flow meter 31 for the drain W1. Detect.
When it is detected that the flow rate of the drain W1 in the drain supply line L1 is below a predetermined threshold (step S25: YES), the control unit 70 advances the process to step S13 in the first embodiment. Moreover, the control part 70 returns a process to step S22, when not detecting that the flow volume of the drain W1 in the drain supply line L1 is less than the predetermined threshold value (step S25: NO).

The boiler system 1 according to the present embodiment having the above-described configuration has the following effects.
The boiler system 1 in the present embodiment generates steam and supplies the generated steam to the load device 12, and the drain that collects the drain W1 generated by the load device 12 condensing when the steam is used. The tank 20, the drain tank 20, and the boiler 10 are connected to each other, the drain supply line L 1 that supplies the drain W 1 accommodated in the drain tank 20 to the boiler 10, and the drain supply line L 1 are supplied to the boiler 10. A drain flow meter 31 that detects the flow rate of the drain W1, a first water supply valve 51 that is disposed in the drain supply line L1 and adjusts the flow rate of the drain W1 supplied to the boiler 10, and supplies makeup water W2 to the boiler 10 A makeup water supply line L2 to be operated and a second water supply valve disposed on the makeup water supply line L2 and opening or closing the makeup water supply line L2 It is provided with a 52, a. Further, the boiler system 1 controls the opening degree of the valve body of the first water supply valve 51 based on the flow rate of the drain W1 detected by the drain flow meter 31, and the drain W1 detected by the drain flow meter 31. Control for closing the first water supply valve 51 and the third water supply valve 53 and opening the second water supply valve 52 when the flow rate of the water decreases or when an abnormality of the first water supply valve 51 is detected. Part 70.

  For this reason, in the boiler system 1, the control unit 70 causes the first water supply valve 51 to be caught by the first water supply valve 51 during operation of the boiler 10 or an error in an electrical signal related to the opening / closing operation of the first water supply valve 51. By detecting the abnormal opening / closing operation of the water supply valve 51, the supply of the makeup water W2 to the boiler 10 can be started promptly. Moreover, the boiler system 1 can start supply of the supplementary water W2 to the boiler 10 rapidly, when the control part 70 detects the fall of the flow volume of the drain W1, during the operation | movement of the boiler 10. FIG. For this reason, the boiler system 1 can prevent the stop of water supply to the boiler 10 that occurs with the passage of time when switching from the supply of the drain W1 to the supply of the makeup water W2. The boiler system 1 can continuously supply water to the boiler 10 even when the opening / closing operation abnormality occurs in the first water supply valve 51, and the operation of the boiler due to the generation of the low water level of the boiler is obstructed. In this way, the steam can be continuously supplied to the load equipment. That is, the boiler system 1 suppresses a shortage of water supply to the boiler 10.

  Moreover, in the boiler system 1 in this embodiment, the control part 70 performs control which opens and closes the 1st water supply valve 51 in multiple times, when the abnormality of the 1st water supply valve 51 is detected.

  For this reason, the boiler system 1 allows the controller 70 to open and close the first water supply valve 51 a plurality of times even when foreign matter is caught in the first water supply valve 51, so that the first water supply valve 51 Biting of foreign matter can be eliminated. Moreover, when the error of the electric signal which concerns on the opening / closing operation | movement of the 1st water supply valve 51 generate | occur | produces, the boiler system 1 makes the error of the said electric signal because the control part 70 opens and closes the 1st water supply valve 51 in multiple times. Can be resolved. Thus, the boiler system 1 can continuously supply the drain W1 to the boiler 10.

  In the boiler system 1 according to the present embodiment, when the control unit 70 detects an abnormality of the first water supply valve 51, the detection of the abnormality is not canceled even if the first water supply valve 51 is opened and closed a plurality of times. Then, the first water supply valve 51 and the third water supply valve 53 are closed and the second water supply valve 52 is opened.

  For this reason, in the boiler system 1, foreign matter is caught in the first water supply valve 51, and an error of an electric signal related to the opening / closing operation of the first water supply valve 51 occurs, and the controller 70 controls the first water supply valve 51. Even if these abnormalities in the first water supply valve 51 cannot be resolved even if the valve is opened and closed several times, the supply of the makeup water W2 to the boiler 10 is promptly started and water is continuously supplied to the boiler 10. It can be performed.

As mentioned above, although preferable embodiment of the boiler system 1 of this invention was described, this invention is not restrict | limited to embodiment mentioned above, It can change suitably.
For example, the other end portion of the makeup water supply line L2 is connected to a line connection portion J1 provided between the first check valve 61 and the second check valve 62 in the drain supply line L1. However, the present invention is not limited to this, and the other end of the makeup water supply line L2 may be directly connected to the boiler 10. In this case, makeup water W <b> 2 accommodated in a water supply tank (not shown) is directly supplied to the boiler 10.

  Moreover, in the boiler system 1 of this embodiment, the control part 70 is the 1st water supply valve 51, when the overcurrent detection sensor (not shown) of the 1st water supply valve 51 detects the electric current more than a predetermined threshold value. Control to open and close multiple times. However, the present invention is not limited to this, and the control unit 70 includes a plurality of second water supply valves 52 when an overcurrent detection sensor (not shown) of the second water supply valve 52 detects a current equal to or greater than a predetermined threshold. You may perform control which opens and closes. Thereby, when the electric current more than a predetermined threshold value is detected in the 2nd water supply valve 52, the control part 70 performs control which opens and closes the 2nd water supply valve 52 in multiple times. Accordingly, the second water supply valve 52 can eliminate the error of the electric signal related to the biting of foreign matter in the second water supply valve 52 and the opening / closing operation of the second water supply valve 52.

  Further, in the boiler system 1 of the present embodiment, the third water supply valve 53 may include an overcurrent detection sensor and be configured to be controlled by the control unit 70. Thereby, when the electric current more than a predetermined threshold value is detected in the 3rd water supply valve 53, the control part 70 performs control which opens and closes the 3rd water supply valve 53 in multiple times. Therefore, the third water supply valve 53 can eliminate the error of the electric signal related to the biting of foreign matter in the third water supply valve 53 and the opening / closing operation of the third water supply valve 53.

  In the boiler system 1 of the present embodiment, the control unit 70 opens and closes the first water supply valve 51 a plurality of times when the overcurrent detection sensor of the first water supply valve 51 detects a current equal to or greater than a predetermined threshold value. Even if it detects that the electric current in the 1st water supply valve 51 is more than a predetermined threshold value, it controls so that the 1st water supply valve 51 and the 3rd water supply valve 53 may be closed, and the 2nd water supply valve 52 may be opened. doing. However, the present invention is not limited to this, and the control unit 70 detects that the current in the first water supply valve 51 is greater than or equal to a predetermined threshold after the opening / closing operation of the first water supply valve 51 is performed for a predetermined time. Thus, the first water supply valve 51 and the third water supply valve 53 may be closed and the second water supply valve 52 may be opened.

  Moreover, in the boiler system 1 of this embodiment, the 1st water supply valve 51 and the 3rd water supply valve 53 are provided in the drain supply line L1. However, the present invention is not limited to this, and only the first water supply valve 51 may be provided in the drain supply line L1.

1 Boiler system 10 Boiler 12 Loaded equipment 20 Drain tank 31 Drain flow meter (Drain flow rate detector)
51 First Water Supply Valve 52 Second Water Supply Valve 70 Control Unit L1 Drain Supply Line L2 Makeup Water Supply Line W1 Drain W2 Makeup Water

Claims (3)

A boiler that generates steam and supplies the generated steam to load equipment;
A drain tank that collects the drain generated by the load device condensing by using steam; and
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 flow rate detector that is disposed in the drain supply line and detects the flow rate of the drain supplied to the boiler;
A first water supply valve that is disposed in the drain supply line and adjusts the flow rate of the drain supplied to the boiler;
A makeup water supply line for supplying makeup water to the boiler;
A second water supply valve disposed in the makeup water supply line and opening or closing the makeup water supply line;
The opening of the first water supply valve is controlled based on the drain flow rate detected by the drain flow rate detection unit, and when the drain flow rate detected by the drain flow rate detection unit decreases or the first A boiler system comprising: a control unit that performs control to close the first water supply valve and open the second water supply valve when an abnormality of one water supply valve is detected.   The boiler system according to claim 1, wherein the control unit performs control to open and close the first water supply valve a plurality of times when an abnormality of the first water supply valve is detected.   The controller closes the first water supply valve when detecting the abnormality of the first water supply valve and the detection of the abnormality is not canceled even if the first water supply valve is opened and closed a plurality of times. The boiler system according to claim 2, wherein control is performed to open the second water supply valve.

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