JP7135675B2 - Laundry factory heat utilization system - Google Patents

Description

TECHNICAL FIELD The present invention relates to a heat utilization system for a cleaning factory that can effectively utilize the thermal energy of steam drain.

2. Description of the Related Art Conventionally, in a linen cleaning factory, steam generated by a steam boiler is used as a heat source for dryers and roll ironers, and as a heat source for washing tubs of continuous washing machines. In recent years, in order to promote energy conservation in factory equipment, the steam drain generated by dryers and roll ironers is collected to generate flash steam, and this flash steam is used as a heat source for continuous washing machines (for example, See Patent Document 1). As a result, the amount of steam supplied from the steam boiler is reduced, which contributes to the reduction of fuel consumption and carbon dioxide emissions.

JP 2009-198038 A

Since the hot water separated with the generation of flash steam is saturated water with high enthalpy, it is collected in the water tank of the steam boiler and used as boiler feed water. However, a small once-through boiler, which is often installed as a heat source in laundry factories, has the characteristic that the higher the temperature of the feed water, the lower the boiler efficiency. Therefore, if a large amount of hot water is collected in the water supply tank to excessively raise the temperature of the water supply, the thermal energy of the steam drain will not be effectively utilized.

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a heat utilization system for a cleaning factory that can effectively utilize the thermal energy of the steam drain.

The present invention includes a steam boiler that heats boiler feed water to generate steam, steam utilization equipment that utilizes the steam generated by the steam boiler, and steam drain discharged from the steam utilization equipment that is recovered and re-evaporated. a flash steam generator for generating flash steam and hot water, a continuous washing machine using the flash steam generated by the flash steam generator, and a boiler water supply tank for storing boiler water supplied to the steam boiler. a washing water tank for storing washing water supplied to the continuous washing machine; boiler water supply means for supplying boiler water water stored in the boiler water supply tank to the steam boiler; washing water supply means for supplying washing water to the continuous washing machine; hot water supply means for supplying hot water generated by the flash steam generator to the boiler water supply tank or the washing water tank; The present invention relates to a heat utilization system for a cleaning factory, comprising hot water supply destination switching means for switching supply destinations, and control means for controlling the hot water supply destination switching means.

Further, the heat utilization system includes temperature detection means for detecting the temperature of the cleaning water stored in the cleaning water tank, and water level detection means for detecting the water level of the cleaning water stored in the cleaning water tank, Preferably, the control means controls the hot water supply destination switching means based on the temperature detected by the temperature detection means and the water level detected by the water level detection means.

(i) when the temperature detected by the temperature detection means is 40° C. or less and the water level detected by the water level detection means is less than the full water level, (ii) the temperature detected by the temperature detection means exceeds 40° C. or the water level detected by the water level detection means is equal to or higher than the water level for determining full water supply; In the case of (1), it is preferable to control the hot water supply destination switching means so as to switch the hot water supply destination of the hot water supply means to the boiler water supply tank .

The flash steam generator includes a flash tank for re-evaporating the recovered steam drain to separate it into flash steam and hot water, a drain recovery line for recovering the steam drain to the flash tank, and a flash steam to the flash tank. a steam air supply line for supplying air from the flash tank, a drain discharge line for discharging hot water from the flash tank, a steam air supply valve provided in the steam air supply line, and a drain discharge valve provided in the drain discharge line It is preferable to provide a distribution route switching means composed of at least a plurality of control valves.

ADVANTAGE OF THE INVENTION According to this invention, the heat utilization system of the cleaning factory which can utilize the heat energy of steam drain effectively can be provided.

BRIEF DESCRIPTION OF THE DRAWINGS It is a figure which shows schematic structure of the heat utilization system which concerns on this embodiment. It is a flowchart which shows the operation control process of the flash steam generator which concerns on this embodiment. 5 is a flow chart showing hot water supply destination switching processing of the control means according to the present embodiment.

EMBODIMENT OF THE INVENTION Hereinafter, the form for implementing this invention is demonstrated, referring drawings. This is just an example, and the technical scope of the present invention is not limited to this.
(embodiment)
First, an outline of an embodiment of the present invention will be described. An embodiment of the present invention is a heat utilization system used in a laundry factory. The heat utilization system switches the discharge destination of hot water discharged from the flash steam generator to a washing water tank that supplies washing water to the continuous washing machine and a boiler water tank that supplies boiler water to the steam boiler. It effectively utilizes the enthalpy of hot water discharged from the flash steam generator to achieve high heat recovery efficiency.

<Heat utilization system 1>
FIG. 1 is a diagram showing a schematic configuration of a heat utilization system 1 according to this embodiment.
The heat utilization system 1 is, for example, a system using equipment provided in a cleaning factory or the like.
The heat utilization system 1 includes a plurality of steam boiler devices 11 (steam boilers), a steam header 12, a steam utilization facility 13, a continuous washing machine 14, a cleaning water tank 15, a boiler water supply tank 16, and flash steam generation. a device 30;

The heat utilization system 1 also includes a first steam line L11, a second steam line L12, a third steam line L13, a first drain line L21, a second drain line L22, and a third drain line L23 (hot water supply means), a washing water line L41 (washing water supply means), and a boiler water supply line L51 (boiler water supply means).
In this specification, "line" is a general term for lines through which fluid can flow, such as channels, routes, and pipelines. In addition, a part of each configuration such as valves and sensors arranged in the line is omitted. Furthermore, with regard to lines, those necessary for explaining the present invention are mainly described, and some of them are omitted.

The steam boiler device 11 is configured by, for example, a multi-tube small once-through boiler. A plurality of steam boiler devices 11 serve as supply sources of high-pressure steam S1 (for example, steam of 0.8 MPa or higher). The steam boiler device 11 burns gas fuel or oil fuel with a burner to heat the boiler water in the water pipe and generate high-pressure steam S1. By controlling the number of operating steam boiler units 11 and the combustion state of each steam boiler unit 11, the amount of steam generated can be adjusted.

The first steam line L11 supplies the steam header 12 with the high-pressure steam S1 generated by the steam boiler device 11 .
The steam header 12 gathers the high-pressure steam S1 generated in each steam boiler device 11 at one place, and absorbs variations in steam pressure between boilers. The high-pressure steam S1 collected in the steam header 12 is supplied toward a plurality of steam utilization facilities 13 (load equipment). Although only one steam utilization facility 13 is shown in FIG. 1, it may be supplied to other steam utilization facilities.

The second steam line L<b>12 supplies the high pressure steam S<b>1 collected in the steam header 12 to the steam utilization facility 13 .
The steam utilization facility 13 is a facility that utilizes the high-pressure steam S1 supplied from the steam header 12 as a heat source. Examples of the steam-utilizing equipment 13 include a dryer and a roll ironer.

The third steam line L13 supplies the flash steam S2 generated by the flash steam generator 30 to the continuous washing machine 14. The upstream end of the third steam line L<b>13 is connected to the steam outlet of the flash steam generator 30 . A downstream end of the third steam line L13 is connected to the continuous washing machine 14 .

The continuous washing machine 14 is equipment that uses the flash steam S2 supplied from the flash steam generator 30 as a heat source and uses the hot water W1 discharged from the flash steam generator 30 as part of the washing water W2. The continuous washing machine 14 includes a pre-washing tub, a washing tub, and a rinsing tub, and continuously performs pre-washing, washing, and rinsing while transporting the laundry, and sends it to the dehydrator (not shown) in the next process. In this embodiment, flash steam S2 is mainly supplied to the washing tub.

The first drain line L21 allows the boiler water supply tank 16 to recover the steam drain D discharged from the steam utilization facility 13 . A steam trap 321 is provided on the steam outlet side of the steam utilization facility 13 . The steam trap 321 is a device that separates the steam drain D from the high-pressure steam S1 and automatically discharges it. A first drain line L21 is laid from the steam trap 321 to the boiler feed water tank 16 .

The first drain line L21 is opened by the bypass valve V25 when the steam drain D is recovered to the boiler water supply tank 16, while the first drain line L21 is opened when the steam drain D is recovered to the flash tank 31 of the flash steam generator 30. , the line is shut off by the bypass valve V25. Therefore, the first drain line L21 functions as a bypass line that bypasses the steam drain D with respect to the flash tank 31 .
The bypass valve V<b>25 is a control valve that constitutes the distribution path switching means 18 described later, and is controlled by a drive signal from the control means 19 . Bypass valve V25 is, for example, a proportional control electric valve.

The second drain line L<b>22 introduces the steam drain D discharged from the steam utilization facility 13 by the operation of the steam trap 321 into the flash steam generator 30 . The second drain line L22 branches off from the first drain line L21 and has a downstream end connected to the drain inlet of the flash steam generator 30 .

The third drain line L23 allows the hot water W1 discharged from the flash steam generator 30 to be recovered in the cleaning water tank 15 or the boiler water supply tank 16. The third drain line L23 has an upstream end connected to the hot water outlet of the flash steam generator 30 and a downstream branch into two lines. One branch line merges with the first drain line L21 communicating with the boiler water supply tank 16, and the other branch line is piped up to the cleaning water tank 15. A three-way valve is provided as a hot water switching valve 20 (hot water supply destination switching means) at a branch point in the middle of the third drain line L23.
The hot water switching valve 20 switches to discharge the hot water W1 to the cleaning water tank 15 or the boiler water tank 16 in response to a signal from the control means 19, which will be described later. Note that the hot water switching valve 20 can also be configured by two two-way valves respectively provided in two branch lines.

The washing water tank 15 is equipment for storing the washing water W2 to be supplied to the continuous washing machine 14 . The cleaning water W2 stored in the cleaning water tank 15 is made up of room-temperature makeup water W0 (for example, softened water) supplied from a makeup water line (reference numeral omitted) and warm water W1 supplied from a third drain line L23. It is mixed.
The washing water tank 15 includes a temperature sensor 21 (temperature detection means) and a water level sensor 22 (water level detection means). A temperature sensor 21 detects the temperature of the cleaning water W2 stored in the cleaning water tank 15 . The water level sensor 22 detects the water level of the cleaning water W2 stored in the cleaning water tank 15 . Detection signals from the temperature sensor 21 and the water level sensor 22 are sent to the control means 19 respectively. Then, the control means 19 performs switching control of the hot water switching valve 20 based on these detection signals.

The washing water line L41 supplies the washing water W2 stored in the washing water tank 15 to the continuous washing machine 14 . An upstream end of the cleaning water line L41 is connected to the cleaning water tank 15 . A downstream end of the washing water line L41 is connected to the continuous washing machine 14 . A water pump (not shown) is provided in the washing water line L41.

The boiler water supply tank 16 is equipment for storing boiler water supply W3 to be supplied to the steam boiler device 11 . The boiler water supply W3 stored in the boiler water supply tank 16 includes room temperature makeup water W0 (for example, softened water) supplied from a makeup water line (reference numeral omitted) and hot water W1 (or It is mixed with the steam drain D).

The boiler water supply line L51 supplies the boiler water supply W3 stored in the boiler water supply tank 16 to each steam boiler device 11 . An upstream end of the boiler water supply line L51 is connected to the boiler water supply tank 16 . Further, the downstream end of the boiler water supply line L51 is branched and connected to each steam boiler device 11 . Each steam boiler device 11 has a water supply pump for supplying boiler water supply W3 to the boiler body.

<Flash steam generator 30>
The flash steam generator 30 includes a flash tank 31, a drain recovery line L31, a steam air supply line L32, a drain discharge line L33, a blow line L34, an initial drain discharge line L35, and a distribution route switching means 18 (inlet valve (V32), steam supply valve (V33), drain discharge valve (V34), and control means (19).

The flash tank 31 is a pressure vessel for re-evaporating the recovered steam drain D and separating it into flash steam S2 and hot water W1. Since the flash tank 31 is a container that holds a liquid whose boiling point is higher than the atmospheric pressure, it is manufactured so as to conform to a small pressure vessel specified in Article 1, Item 6 of the Ordinance for Enforcement of the Industrial Safety and Health Act. A safety valve (also referred to as a relief valve, not shown) is connected to the upper portion of the flash tank 31 to release the pressure when the pressure inside the pressure vessel increases.

The drain recovery line L31 causes the flash tank 31 to recover the steam drain D flowing from the first drain line L21 to the second drain line L22. The upstream end of the drain recovery line L31 serves as the drain inlet of the apparatus, and the downstream end is connected to the body of the flash tank 31 . The drain recovery line L31 is provided with an inlet valve V32.
The inlet valve V<b>32 is a control valve that constitutes the flow path switching means 18 and is controlled by a drive signal from the control means 19 . The inlet valve V32 is, for example, a proportional control motor operated valve. Incidentally, if the boiler water supply tank 16 is an open-air tank, the inlet valve V32 can be omitted. During operation of the flash steam generator 30, the internal pressure of the flash tank 31 becomes higher than the atmospheric pressure. 16 can be discharged.

The steam air supply line L32 supplies the flash steam S2 from the flash tank 31 to the third steam line L13. The upstream end of the steam air supply line L32 is connected to the top of the flash tank 31 . Further, the downstream end of the steam air supply line L32 serves as a steam outlet of the apparatus. A steam air supply valve V33 is provided in the steam air supply line L32.
The steam supply valve V<b>33 is a control valve that constitutes the flow path switching means 18 and is controlled by a drive signal from the control means 19 . The steam air supply valve V33 is, for example, a proportional control electric valve.

The drain discharge line L33 sends out the hot water W1 in the flash tank 31 (steam drain D after separating the flash steam S2) to the third drain line L23. The upstream end of the drain discharge line L33 is connected to the bottom of the flash tank 31 . The downstream end of the drain discharge line L33 serves as a drain outlet of the apparatus. That is, the hot water W1 separated by the flash tank 31 is recovered to the boiler water supply tank 16 through the third drain line L23 and the first drain line L21, and then reused as part of the boiler water supply W3. Also, the hot water W1 separated by the flash tank 31 is collected in the washing water tank 15 and then used in the continuous washing machine 14 as part of the washing water W2. A drain discharge valve V34 is provided in the drain discharge line L33.
The drain discharge valve V34 is a control valve that constitutes the flow path switching means 18 and is controlled by a drive signal from the control means 19. FIG. The drain discharge valve V34 is, for example, a proportional control electric valve.

The blow line L34 sends out the hot water W1 (steam drain D after separating the flash steam S2) in the flash tank 31 to another drain line (not shown). Another drain line discharges hot water W1 to the blow outlet. The upstream end of the blow line L34 is branched from the drain discharge line L33 upstream of the drain discharge valve V34. The downstream end of blow line L34 is the blow outlet of the device. The blow line L34 is provided with a manual valve (not shown).

The initial drain discharge line L35 discharges the low-temperature steam drain D that has flowed into the drain recovery line L31 when the steam utilization facility 13 is started in a cold state. The upstream end of the initial drain discharge line L35 is branched from the drain recovery line L31. The downstream end of the initial drain discharge line L35 is gathered in the blow line L34. An initial drain discharge valve (not shown) is provided in the initial drain discharge line L35.
The initial drain discharge valve is a control valve that constitutes the flow path switching means 18 and is controlled by a drive signal from the control means 19 . The initial drain discharge valve is, for example, a proportional control motor operated valve.

The flow path switching means 18 is composed of control valves such as the inlet valve V32, the steam supply valve V33, the drain discharge valve V34, the initial drain discharge valve, and the bypass valve V25, as described above.
The control means 19 receives detection signals from various sensors provided in the washing water tank 15 and controls the hot water switching valve 20 . Further, the control means 19 controls the distribution route switching means 18 and the like. The control means 19 is configured by, for example, a PLC (Programmable Logic Controller) capable of executing sequence control. In addition to various programs, the memory area of the PLC stores previously input control setting data and data detected by sensors during operation.

<Description of processing>
Next, processing of the flash steam generator 30 will be described.
FIG. 2 is a flowchart showing operation control processing in the flash steam generator 30 according to this embodiment.
First, in step S (hereinafter simply referred to as "S") 10, the control means 19 of the flash steam generator 30 accepts power-on (ON), and in S11 performs start-up preparation processing.

In the startup preparation process, the control means 19 controls the distribution path switching means 18 to reset each valve to a predetermined open/closed state. Specifically, the flow path switching means 18 fully closes the inlet valve V32, fully closes the steam supply valve V33, fully opens the drain discharge valve V34, fully closes the initial drain discharge valve, and fully closes the bypass valve V25. fully open. Normally, each valve is controlled to a predetermined open/closed state when the device is stopped. However, in consideration of the case where the valve is manually operated while the device is stopped, it is reset to a predetermined open/closed state by the startup preparation process. The degree of opening of each valve is 0% when fully closed and 100% when fully open.

In S12, when the control means 19 receives the operation switch ON, in S13, it performs operation processing.
In the operation processing, the control means 19 determines the water level in the container of the flash tank 31 and performs processing according to the water level. In addition, the control means 19 performs control processing of the inlet valve V32, the steam supply valve V33, the drain discharge valve V34, the initial drain discharge valve, and the bypass valve V25 in parallel. Details of the operation process are described in Japanese Patent Application No. 2017-50426 filed by the applicant of the present application.
In S14, the control means 19 performs hot water supply destination switching processing.

Here, the hot water supply destination switching process will be described with reference to FIG.
In S20 of FIG. 3, the control means 19 receives the detection signal from each sensor. Here, each sensor includes the temperature sensor 21 and the water level sensor 22 . It is assumed that each sensor sends out a detection signal at regular time intervals. It should be noted that the control means 19 may inquire of each sensor, for example, at regular time intervals, and each sensor may send out a detection signal in response to the inquiry. Further, for example, while the operation switch is ON, the control means 19 may always receive detection signals from each sensor.

At S21, the control means 19 determines whether or not the detection data from the detection signal satisfies the first condition. The first condition is that the temperature indicated by the data detected by the temperature sensor 21 is 40° C. or less. Here, 40° C. is set as a preset temperature lower than the heat denaturation temperature of proteins. Pre-washing performed in the continuous washing machine 14 must be performed at 40° C. or less in order to effectively remove protein-based stains. The reason for this is that if the temperature exceeds 40° C., it becomes difficult to remove stains due to heat denaturation of proteins. Therefore, the washing water W2 sent from the washing water tank 15 to the continuous washing machine 14 (pre-washing tank) needs to be 40° C. or less. Therefore, the first condition is that the temperature of the cleaning water W2 stored in the cleaning water tank 15 is 40° C. or lower. If the detected data satisfies the first condition (S21: YES), the control means 19 shifts the process to S22. On the other hand, if the detected data does not satisfy the first condition (S21: NO), the control means 19 shifts the process to S24.

In S22, the control means 19 determines whether or not the detection data from the detection signal satisfies the second condition. The second condition is that the water level indicated by the detection data of the water level sensor 22 is less than the full water level. This is to prevent the washing water tank 15 from becoming full. If the detected data satisfies the second condition (S22: YES), the control means 19 shifts the process to S23. On the other hand, if the detected data does not satisfy the second condition (S22: NO), the control means 19 shifts the process to S24.

At S<b>23 , the control means 19 controls the hot water switching valve 20 so as to supply the hot water W<b>1 to the washing water tank 15 . By controlling the hot water switching valve 20 by the control means 19 , the hot water W<b>1 sent from the flash tank 31 is collected in the cleaning water tank 15 . After that, the control means 19 shifts the processing to S15 in FIG.
On the other hand, at S<b>24 , the control means 19 controls the hot water switching valve 20 so as to supply the hot water W<b>1 to the boiler water supply tank 16 . Hot water W<b>1 sent from the flash tank 31 is collected in the boiler water supply tank 16 by the control of the hot water switching valve 20 by the control means 19 . After that, the control means 19 shifts the processing to S15 in FIG.

By this hot water supply destination switching process, if the temperature of the washing water W2 stored in the washing water tank 15 is 40° C. or less suitable for use in the continuous washing machine 14 and the washing water tank 15 is not full. , the warm water W1 is preferentially collected in the washing water tank 15. As shown in FIG.
On the other hand, since the amount of hot water W1 collected in the boiler water supply tank 16 is reduced, an excessive temperature rise of the boiler water supply W3 is suppressed. Therefore, the steam boiler device 11 (small once-through boiler) can be operated without lowering the boiler efficiency.

In S15 of FIG. 2, the control means 19 determines whether or not the operation switch OFF has been received. When the operation switch OFF is received (S15: YES), the control means 19 shifts the process to S16 and performs a stop process for stopping the operation of the flash steam generator 30. FIG. On the other hand, if the operation switch OFF has not been received (S15: NO), the control means 19 shifts the process to S13.

According to the heat utilization system 1 of this embodiment described above, the following effects are obtained.
The heat utilization system 1 includes a steam boiler device 11, a steam utilization facility 13, and a flash steam generator that recovers and re-evaporates steam drain D generated in the steam utilization facility 13 to generate flash steam S2 and hot water W1. 30, a continuous washing machine 14 that uses flash steam S2 generated by the flash steam generator 30, a boiler water supply tank 16 that stores boiler water supply W3, and a washing that stores cleaning water W2 supplied to the continuous washing machine 14. A boiler water supply line L51 that supplies the boiler water supply W3 stored in the water tank 15 and the boiler water supply tank 16 to the steam boiler device 11, and a washing water line that supplies the washing water W2 stored in the washing water tank 15 to the continuous washing machine 14. L41, a third drain line L23 that supplies the hot water W1 generated by the flash steam generator 30 to the boiler water supply tank 16 or the cleaning water tank 15, and a hot water switching valve 20 that switches the supply destination of the hot water W1 from the third drain line L23. and a control means 19 for controlling the hot water switching valve 20 . As a result, most of the hot water W1 is recovered to the cleaning water tank 15, thereby reducing the amount of the hot water W1 recovered to the boiler feed water tank 16 and suppressing an excessive temperature rise of the boiler feed water W3. As a result, the steam boiler device 11 can be operated without lowering the boiler efficiency while recovering the entire amount of the hot water W1.

The heat utilization system 1 also includes a temperature sensor 21 for detecting the temperature of the cleaning water W2 stored in the cleaning water tank 15, a water level sensor 22 for detecting the water level of the cleaning water W2 stored in the cleaning water tank 15, configured with (i) When the temperature detected by the temperature sensor 21 is equal to or lower than the set temperature lower than the thermal denaturation temperature of the protein, and the water level detected by the water level sensor 22 is less than the full water level, warm water is supplied to the third drain line L23. The hot water switching valve 20 is controlled to switch the supply destination of W1 to the washing water tank 15, and (ii) when the temperature detected by the temperature sensor 21 exceeds the set temperature or the water level detected by the water level sensor 22 is equal to or higher than the full water level. , the hot water switching valve 20 is controlled so as to switch the hot water supply destination of the hot water W1 through the third drain line L23 to the boiler water supply tank 16 . As a result, the saturated hot water W1 with high enthalpy can be preferentially collected in the washing water tank 15 and effectively used in the continuous washing machine 14 .

The set temperature of the washing water W2 stored in the washing water tank 15 is set to 40° C., which is lower than the thermal denaturation temperature of protein. Thus, by using the washing water W2 having a temperature equal to or lower than the set temperature for pre-washing in the continuous washing machine 14, protein-based stains can be effectively removed.

In addition, the flash steam generator 30 includes a flash tank 31 that separates the steam drain D into flash steam S2 and hot water W1, a drain recovery line L31 that recovers the steam drain D to the flash tank 31, and a flash steam S2 to the flash tank. 31, a drain discharge line L33 for discharging the warm water W1 from the flash tank 31, a steam air supply valve V33 provided in the steam air supply line L32, and a drain discharge line L33. a flow path switching means 18 composed of a plurality of control valves including at least the drain discharge valve V34. As a result, the steam air supply valve V33 and the drain discharge valve V34 can be controlled to easily maintain the can pressure and the can water level in the flash tank 31 within appropriate ranges, and the high enthalpy flash steam S2 can be supplied to the continuous washing machine. 14 can be supplied.

Although preferred embodiments of the heat utilization system of the present invention have been described above, the present invention is not limited to the above-described embodiments and can be modified as appropriate.
For example, although the control means for controlling the hot water switching valve is performed by the control means for the flash steam generator, the control means for controlling the hot water switching valve may be provided separately from the control means for the flash steam generator. good.

In addition, in the hot water supply destination switching process, it is determined whether or not the first condition and the second condition are satisfied in order. may

1 heat utilization system 11 steam boiler device 13 steam utilization equipment 14 continuous washing machine 15 washing water tank 16 boiler water supply tank 18 distribution path switching means 19 control means 20 hot water switching valve (hot water supply destination switching means)
21 temperature sensor (temperature detection means)
22 water level sensor (water level detection means)
30 flash steam generator 31 flash tank D steam drain L23 third drain line (hot water supply means)
L31 drain recovery line L32 steam air supply line L33 drain discharge line L41 cleaning water supply line (cleaning water supply means)
L51 boiler water supply line (boiler water supply means)
S2 Flash steam V33 Steam air supply valve V34 Drain discharge valve W1 Warm water W2 Cleaning water W3 Boiler water supply

Claims (4)

a steam boiler for heating boiler feed water to generate steam;
a steam utilization facility that utilizes the steam generated by the steam boiler;
a flash steam generator that collects and re-evaporates steam drain discharged from the steam utilization facility to generate flash steam and hot water;
a continuous washing machine using flash steam generated by the flash steam generator;
a boiler feed water tank for storing boiler feed water to be supplied to the steam boiler;
a washing water tank for storing washing water supplied to the continuous washing machine;
boiler water supply means for supplying boiler water water stored in the boiler water water tank to the steam boiler;
a washing water supply means for supplying the washing water stored in the washing water tank to the continuous washing machine;
hot water supply means for supplying hot water generated by the flash steam generator to the boiler water tank or the cleaning water tank;
hot water supply destination switching means for switching a hot water supply destination by the hot water supply means;
and a control means for controlling the hot water supply destination switching means. temperature detection means for detecting the temperature of the cleaning water stored in the cleaning water tank;
water level detection means for detecting the water level of the cleaning water stored in the cleaning water tank;
The control means is
2. The heat utilization system for a cleaning factory according to claim 1, wherein said hot water supply destination switching means is controlled based on the detected temperature of said temperature detecting means and the detected water level of said water level detecting means. The control means is
(i) When the temperature detected by the temperature detection means is 40° C. or less and the water level detected by the water level detection means is less than the full water level, the hot water supply means switches the hot water supply destination to the washing water tank. controlling the hot water supply destination switching means;
(ii) When the temperature detected by the temperature detection means exceeds 40° C. or the water level detected by the water level detection means is equal to or higher than the full water level, the hot water supply destination of the hot water supply means is switched to the boiler water tank. 3. The heat utilization system for a laundry factory according to claim 2, wherein the hot water supply destination switching means is controlled at the same time. The flash steam generator is
a flash tank for re-evaporating the recovered steam drain to separate it into flash steam and hot water;
a drain recovery line for recovering steam drain to the flash tank;
a steam air supply line for supplying flash steam from the flash tank;
a drain discharge line for discharging hot water from the flash tank;
4. Distribution path switching means comprising a plurality of control valves including at least a steam air supply valve provided in the steam air supply line and a drain discharge valve provided in the drain discharge line. The heat utilization system of the cleaning factory according to any one of 1.

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