JP2020051706A - Steam system - Google Patents

Abstract

To provide a steam system capable of starting a steam boosting apparatus in a state suitable for driving upon the cold start of a steam generation apparatus.SOLUTION: A steam system 1 comprises: a flash steam generation apparatus 20; a steam boosting machine 30 of boosting steam generated by the flash steam generation apparatus 20; a temperature sensor 31 of detecting the steam temperature at the suction side of the steam boosting machine 30; a temperature sensor 32 of detecting the steam temperature at the discharge side of the steam boosting machine 30; a pressure sensor 33 of detecting the steam pressure at the discharge side of the steam boosting machine 30; and control means 29 of controlling the start and stop of the steam boosting machine 30. The control means 29 starts the steam boosting machine 30 in the case where the detected temperature of the temperature sensor 32 reaches a saturation temperature corresponding to the detected pressure of the pressure sensor 33 or higher, and also, in the detected temperature of the temperature sensor 31, a state of 100°C or higher continues a pre-set first time.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a steam system including a steam generator and a steam booster.

  BACKGROUND ART Conventionally, a steam generator capable of generating low-pressure steam of about 0.05 to 0.2 MPa has been known. For example, the steam generator described in Patent Document 1 collects steam drain (steam condensed water) discharged from a high-pressure steam utilization facility in a pressure vessel (flash tank), and collects the collected steam drain inside the pressure vessel. Re-evaporate and separate into low pressure steam and hot water. The steam generating device described in Patent Document 2 distributes a heat source fluid such as waste gas or waste hot water through a heat transfer tube disposed inside a pressure vessel, and sprays water onto the heat transfer tube to evaporate the low pressure steam. Generate. The steam generator described in Patent Document 3 heats water by pumping heat from a heat source fluid such as waste hot water by a heat pump circuit to generate low-pressure steam.

JP 20127762 A JP-A-62-280501 JP 2012-247146 A

  Since low-pressure steam has a small enthalpy per unit volume, steam utilization equipment that can use the low-pressure steam as it is is limited. Therefore, low-pressure steam is pressurized to about 0.4 to 0.7 MPa by a steam pressurizing device, and the obtained medium-pressure steam is supplied to steam utilization equipment. The steam booster introduces steam into a compression working chamber formed between, for example, a pair of male and female screw rotors, and continuously compresses the steam to increase the pressure. Further, the steam pressure increasing device is operated while injecting cooling water into a casing containing a screw rotor in order to perform a compression operation in a state close to isothermal compression (Japanese Patent Application Laid-Open No. 2010-138721). The water droplets atomized by the injection evaporate on the rotor surface, take heat of the latent heat of vaporization from the compressed steam, and cool the compressed steam. Thereby, the thermal expansion of the rotor is suppressed, and the rotor is prevented from being twisted or damaged.

  On the other hand, when the steam pressure in the compression working chamber becomes lower than the saturation temperature, the steam may be condensed, and the surface of the rotor may be covered with a liquid film of condensed water. When the vapor pressure increasing device is in such a state, the jetted water droplets are absorbed by the liquid film before evaporating, and the surface area decreases, and the evaporation amount of the cooling water decreases. When the evaporation amount of the cooling water decreases, the cooling of the rotor becomes insufficient, so that various problems may occur. Therefore, a commercially available water injection type steam booster is provided with a function of stopping the steam booster when the steam on the discharge side becomes lower than the saturation temperature during operation.

  By the way, if the steam booster is started in a state where the steam pipe is not sufficiently heated, the steam booster is immediately stopped because the steam on the discharge side is lower than the saturation temperature. Therefore, when the steam generator is started in a cold state, the steam booster is frequently started and stopped, which may cause an abnormality or a failure.

  Accordingly, it is an object of the present invention to provide a steam system that can start a steam booster in a state suitable for operation when a steam generator is started in a cold state.

  The present invention relates to a steam generator, a steam booster for boosting the steam generated by the steam generator, a suction steam temperature detecting means for detecting a steam temperature on a suction side of the steam booster, and the steam booster. Discharge steam temperature detection means for detecting the steam temperature on the discharge side of the discharge steam pressure detection means for detecting the steam pressure on the discharge side of the steam booster, control means for controlling the start and stop of the steam booster The control means, wherein the detected temperature of the discharged steam temperature detecting means is equal to or higher than the saturation temperature corresponding to the detected pressure of the discharged steam pressure detecting means, and the detected temperature of the suction steam temperature detecting means is 100 ° C or higher. The present invention relates to a steam system that activates the steam booster when the state of (1) continues for a preset first time.

  In addition, the control means, during the operation of the steam pressure increasing device, the detected temperature of the discharge steam temperature detection means is less than the saturation temperature corresponding to the detection pressure of the discharge steam pressure detection means, or the suction steam temperature detection means When the detected temperature is lower than 100 ° C., it is preferable to stop the steam booster.

  In addition, the steam generator is a flash tank that re-evaporates the collected steam drain to separate flash steam and hot water, a drain recovery line that collects steam drain in the flash tank, and a flash steam from the flash tank. A steam air supply line for supplying air to the steam booster, a drain discharge line for discharging hot water from the flash tank, an inlet valve provided for the drain recovery line, and a steam air supply provided for the steam supply line It is preferable to include a valve and a flow path switching unit including a plurality of control valves including at least a drain discharge valve provided in the drain discharge line.

  Advantageous Effects of Invention According to the present invention, it is possible to provide a steam system that can start a steam booster in a state suitable for operation when a steam generator is cold started.

It is a figure showing the schematic structure of the steam system concerning this embodiment. It is a flowchart which shows the operation control processing of the flash steam generator concerning this embodiment. It is a flowchart which shows the steam booster start control processing of the flash steam generator concerning this embodiment. It is a flowchart which shows the steam booster check process of the flash steam generator concerning this embodiment.

Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings. This is merely 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. In the embodiment of the present invention, when the flash steam generator is cold started, the steam booster is started in a state suitable for operation.

<Steam system 1>
FIG. 1 is a diagram showing a schematic configuration of a steam system 1 according to the present embodiment.
The steam system 1 includes a plurality of steam boilers 11, a steam header 12, high-pressure steam utilization equipment 13, medium-pressure steam utilization equipment 14, a flash steam generator 20 (steam generator), and a steam booster 30 ( And a water supply tank 40.
In addition, the steam system 1 includes a first steam line L11, a second steam line L12, a third steam line L13, a fourth steam line L14, a first drain line L31, a second drain line L32, A three-drain line L33 and a boiler water supply line L41 are provided.
The “line” in this specification is a general term for lines such as flow paths, paths, and conduits through which fluid can flow. In addition, each component such as a valve and a sensor arranged in the line is partially omitted. Further, as for the lines, those necessary for the description of the present invention are mainly described, and the description is partially omitted.

  The steam boiler device 11 is configured by, for example, a multi-tube small once-through boiler. The plurality of steam boilers 11 serve as a supply source of high-pressure steam S1 (for example, steam of 0.8 MPa or more). The steam boiler device 11 burns gas fuel or oil fuel with a burner to heat boiler water in a water pipe, and generates high-pressure steam S1. By controlling the number of operating steam boilers 11 and the combustion state of each steam boiler 11, the amount of generated steam is adjustable.

The first steam line L11 supplies the high-pressure steam S1 generated in the steam boiler device 11 to the steam header 12.
The steam header 12 collects the high-pressure steam S1 generated in each steam boiler device 11 at one location, and absorbs a variation in steam pressure between the boilers. The high-pressure steam S1 collected in the steam header 12 is supplied to a plurality of steam utilization facilities (load devices).

The second steam line L12 supplies the high-pressure steam S1 collected in the steam header 12 to the high-pressure steam utilization equipment 13.
The high-pressure 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 high-pressure steam utilization equipment 13 include production equipment such as an ironer at a cleaning factory and a fryer at a food processing factory.

The third steam line L13 reduces the pressure of the high-pressure steam S1 collected in the steam header 12 to a medium-pressure steam S2, and supplies the medium-pressure steam S2 to the medium-pressure steam utilization facility 14. The third steam line L13 is provided with a pressure reducing valve (not shown) for obtaining medium-pressure steam S2 (for example, steam of about 0.4 to 0.7 MPa) from high-pressure steam S1.
The medium-pressure steam utilization facility 14 is a facility that uses the medium-pressure steam S2 supplied from the steam header 12 or the medium-pressure steam S2 supplied from a steam booster 30 described later as a heat source. Examples of the medium-pressure steam utilization equipment 14 include production equipment such as a dryer in a cleaning factory and a concentrator in a food processing factory.

  The fourth steam line L <b> 14 boosts the flash steam S <b> 3 generated by the flash steam generator 20 to generate medium-pressure steam S <b> 2, and supplies the medium-pressure steam S <b> 2 to the medium-pressure steam utilization facility 14. The upstream end of the fourth steam line L14 is connected to the steam outlet of the flash steam generator 20. The downstream end of the fourth steam line L14 is connected to the third steam line L13. The fourth steam line L14 is provided with a steam booster 30 for obtaining a medium-pressure steam S2 of a required pressure from the flash steam S3.

  As the steam booster 30, for example, a screw compressor can be used. The steam booster 30 is controlled by a drive command signal and a stop command signal transmitted from a control unit 29 (described later) of the flash steam generator 20.

In the fourth steam line L14, on the suction side of the steam booster 30, a temperature sensor 31 (suction steam temperature detecting means) is provided. On the discharge side of the steam booster 30, a temperature sensor 32 (discharge steam temperature detecting means) and a pressure sensor 33 (discharge steam pressure detecting means) are provided.
The temperature sensor 31 detects the temperature of the flash steam S3 flowing through the fourth steam line L14 on the suction side.
The temperature sensor 32 detects the temperature of the medium-pressure steam S2 flowing through the fourth steam line L14 on the discharge side.
The pressure sensor 33 detects the steam pressure of the medium-pressure steam S2 flowing through the fourth steam line L14 on the discharge side.
The temperature sensor 31, the temperature sensor 32 and the pressure sensor 33 are connected to the control means 29 of the flash steam generator 20 and send out a detection signal to the control means 29.

  The first drain line L31 causes the water supply tank 40 to collect the steam drain D generated in the high-pressure steam utilization facility 13. A steam trap 321 is provided on the steam outlet side of the high-pressure 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 the steam D. The first drain line L31 is piped from the steam trap 321 to the water supply tank 40.

The first drain line L31 is opened by the bypass valve V25 when the steam drain D is collected in the water supply tank 40, and when the steam drain D is collected in the flash tank 21 of the flash steam generator 20, The line is cut off by the bypass valve V25. Therefore, the first drain line L31 functions as a bypass line that bypasses the steam drain D with respect to the flash tank 21.
The bypass valve V25 is a control valve that constitutes a flow path switching unit 28 described later, and is controlled by a drive signal from the control unit 29. The bypass valve V25 is, for example, a proportional control electric valve.

  The second drain line L32 causes the steam drain D generated in the high-pressure steam utilization facility 13 to be introduced into the flash steam generator 20. The second drain line L32 branches from the first drain line L31, and the downstream end is connected to the drain inlet of the flash steam generator 20.

  The third drain line L33 causes the hot water W discharged from the flash steam generator 20 to be collected in the water supply tank 40. The third drain line L33 has an upstream end connected to the hot water outlet of the flash steam generator 20, and a downstream end joined to the first drain line L31.

  The boiler feed line L41 supplies each steam boiler device 11 with boiler feed water in which hot water W (or steam drain D) is mixed with make-up water supplied to the water tank 40 by a not-shown feed line. The upstream end of the boiler water supply line L41 is connected to the water supply tank 40. The downstream end of the boiler water supply line L41 is connected to each steam boiler device 11 via a branch line. The makeup water is, for example, softened water.

<Flash steam generator 20>
The flash steam generator 20 includes a flash tank 21, a drain recovery line L21, a steam supply line L22, a drain discharge line L23, a blow line L24, an initial drain discharge line L25, a flow path switching unit 28 (inlet) A valve V22, a steam supply valve V23, a drain discharge valve V24) and a control means 29.

  The flash tank 21 is a pressure vessel for re-evaporating the collected steam drain D to separate it into flash steam S3 and hot water W. The flash tank 21 is a container that holds a liquid exceeding the boiling point at atmospheric pressure, and is manufactured so as to be compatible with a small pressure container specified in Article 1, Item 6 of the Industrial Safety and Health Act. A safety valve (also referred to as a relief valve, not shown) for releasing the pressure when the pressure in the pressure vessel rises is connected to an upper portion of the flash tank 21.

The drain recovery line L21 causes the flash tank 21 to recover the steam drain D flowing from the first drain line L31 to the second drain line L32. The upstream end of the drain recovery line L21 is a drain inlet of the apparatus, and the downstream end is connected to the body of the flash tank 21. An inlet valve V22 is provided in the drain recovery line L21.
The inlet valve V22 is a control valve that constitutes the flow path switching means 28, and is controlled by a drive signal from the control means 29. The inlet valve V22 is, for example, a proportional control electric valve.

The steam supply line L22 supplies the flash steam S3 from the flash tank 21 to the fourth steam line L14. The upstream end of the steam supply line L22 is connected to the top of the flash tank 21. The downstream end of the steam supply line L22 is a steam outlet of the apparatus. The steam air supply line L22 is provided with a steam air supply valve V23.
The steam supply valve V23 is a control valve that constitutes the flow path switching unit 28, and is controlled by a drive signal from the control unit 29. The steam supply valve V23 is, for example, a proportional control electric valve.

The drain discharge line L23 sends out the hot water W (the steam drain D after the flash steam S3 is separated) in the flash tank 21 to the third drain line L33. The upstream end of the drain discharge line L23 is connected to the bottom of the flash tank 21. The downstream end of the drain discharge line L23 is a drain outlet of the apparatus. That is, the hot water W separated in the flash tank 21 is collected in the water supply tank 40 through the third drain line L33 and the first drain line L31, and is reused as a part of the boiler water supply. A drain discharge valve V24 is provided in the drain discharge line L23.
The drain discharge valve V24 is a control valve that constitutes the flow path switching means 28, and is controlled by a drive signal from the control means 29. The drain discharge valve V24 is, for example, a proportional control electric valve.

  The blow line L24 sends out the hot water W (the steam drain D after the flash steam S3 is separated) in the flash tank 21 to another drain line (not shown). Another drain line discharges the hot water W to the blow outlet. The upstream end of the blow line L24 is branched from the drain discharge line L23 upstream of the drain discharge valve V24. The downstream end of the blow line L24 is a blow outlet of the apparatus. A manual valve (not shown) is provided in the blow line L24.

The initial drain discharge line L25 discharges the low-temperature steam drain D flowing into the drain recovery line L21 when the high-pressure steam utilization facility 13 is started in a cold state. The upstream end of the initial drain discharge line L25 is branched from the drain recovery line L21. The downstream end of the initial drain discharge line L25 is gathered in the blow line L24. The initial drain discharge line L25 is provided with an initial drain discharge valve (not shown).
The initial drain discharge valve is a control valve constituting the flow path switching means 28, and is controlled by a drive signal from the control means 29. The initial drain discharge valve is, for example, a proportional control electric valve.

  As described above, the flow path switching unit 28 includes the control valves of the inlet valve V22, the steam supply valve V23, the drain discharge valve V24, the initial drain discharge valve, and the bypass valve V25.

  The control means 29 controls starting and stopping of the steam booster 30 based on detection signals from the temperature sensors 31 and 32 and the pressure sensor 33. The control unit 29 controls the distribution route switching unit 28 and the like. The control unit 29 is configured by, for example, a PLC (Programmable Logic Controller) capable of executing sequence control. In the memory area of the PLC, in addition to various programs, control setting data input in advance and detection data during operation by sensors are stored.

<Description of processing>
Next, the processing of the flash steam generator 20 will be described.
FIG. 2 is a flowchart showing an operation control process in the flash steam generator 20 according to the present embodiment.
First, in step S (hereinafter simply referred to as “S”) 10, the control unit 29 of the flash steam generator 20 receives a power-on (ON), and performs a startup preparation process in S11.
In the startup preparation process, the control unit 29 controls the distribution path switching unit 28 to reset each valve to a predetermined open / closed state. Specifically, the inlet valve V22 is fully closed, the steam supply valve V23 is fully closed, the drain discharge valve V24 is fully opened, the initial drain discharge valve is fully closed, and the bypass valve V25 is opened by the flow path switching means 28. Fully open. Normally, each valve is controlled to a predetermined open / closed state when the device is stopped. However, in consideration of a case where the valve is manually operated while the apparatus is stopped, the predetermined opening / closing state is reset by the start preparation processing. The degree of opening of each valve is 0% when fully closed and 100% when fully opened.

In S12, when the control unit 29 receives the operation switch ON, the control unit 29 performs an operation process in S13.
In the operation process, the control unit 29 determines the water level in the container of the flash tank 21 and performs a process according to the water level. In addition, the control unit 29 performs control processing of the inlet valve V22, the steam supply valve V23, the drain discharge valve V24, the initial drain discharge valve, and the bypass valve V25 in parallel. The details of the driving process are described in Japanese Patent Application No. 2017-50426 filed by the present applicant.
In S14, the control unit 29 performs a startup control process of the steam booster 30.

Here, the startup control process of the steam booster 30 will be described with reference to FIG.
In S20 of FIG. 3, the control unit 29 receives a detection signal from each sensor. Here, each sensor includes at least a temperature sensor 31, a temperature sensor 32, and a pressure sensor 33. Each sensor sends out a detection signal at regular time intervals. The control unit 29 may inquire each sensor, for example, at regular time intervals, and each sensor may transmit a detection signal in response to the inquiry. Further, for example, while the operation switch is ON, the control means 29 may always receive a detection signal from each sensor.

In S21, the control unit 29 determines whether the detection data based on the detection signal satisfies the first condition. The first condition is that the temperature (detected temperature) indicated by the data detected by the temperature sensor 32 is equal to or higher than the saturation temperature with respect to the pressure (detected pressure) indicated by the data detected by the pressure sensor 33, and the data indicated by the temperature sensor 31 indicates. A state in which the temperature (detection temperature) is 100 ° C. or higher.
When the detection data satisfies the first condition (S21: YES), the control unit 29 shifts the processing to S22. On the other hand, when the detection data does not satisfy the first condition (S21: NO), the control unit 29 shifts the processing to S20.

  In S22, the control unit 29 determines whether or not the specified time (first time) has elapsed while the detection data based on the detection signal received at a predetermined time interval satisfies the above-described first condition. . That is, here, the control unit 29 determines whether or not the first condition is continuously satisfied during the designated time. If the designated time has elapsed (S22: YES), the control means 29 shifts the processing to S23. On the other hand, when the designated time has not elapsed (S22: NO), the control unit 29 shifts the processing to S20. The case where the designated time has not elapsed includes the case where the first condition is not satisfied, and the case where the first condition is not satisfied halfway.

In S23, the control means 29 starts the steam booster 30 by transmitting a drive command signal to the steam booster 30. Thereafter, the control unit 29 shifts the processing to S15 in FIG.
By this activation control process, even if the operation of the flash steam generator 20 is started, the activation of the steam booster 30 can be prevented from starting unless the first condition is continuously satisfied for the specified time.
In S15 of FIG. 2, the control unit 29 performs a steam booster check process.

Here, the checking process of the steam booster 30 will be described with reference to FIG. This check process is a process for determining whether or not to continue the operation of the steam booster 30.
In S30 of FIG. 4, the control unit 29 receives a detection signal from each sensor. This process is similar to the process of S20 in FIG.

In S31, the control unit 29 determines whether the detection data based on the detection signal satisfies the second condition. The second condition refers to a state where the temperature indicated by the data detected by the temperature sensor 32 is lower than the saturation temperature with respect to the pressure indicated by the data detected by the pressure sensor 33.
When the detected data satisfies the second condition (S31: YES), the control unit 29 shifts the processing to S33. On the other hand, when the detection data does not satisfy the second condition (S31: NO), the control unit 29 shifts the processing to S32.

In S32, the control unit 29 determines whether the detection data based on the detection signal satisfies the third condition. The third condition refers to a state where the temperature indicated by the detection data of the temperature sensor 31 is lower than 100 ° C.
When the detection data satisfies the third condition (S32: YES), the control unit 29 shifts the processing to S33. On the other hand, if the detected data does not satisfy the third condition (S32: NO), the control unit 29 ends this processing, and moves the processing to S16 in FIG.
In S33, the control means 29 stops the steam booster 30 by transmitting a stop command signal to the steam booster 30. After that, the control unit 29 ends this processing, and moves the processing to S16 in FIG.

In S16 of FIG. 2, the control unit 29 determines whether or not the operation switch OFF has been received. When the operation switch OFF has been received (S16: YES), the control unit 29 shifts the processing to S17 and performs a stop processing for stopping the operation of the flash steam generator 20. On the other hand, when the operation switch OFF has not been received (S16: NO), the control unit 29 shifts the processing to S18.
In S18, the control means 29 determines whether the steam booster 30 is operating. If the vehicle is running (S18: YES), the control unit 29 shifts the processing to S15. On the other hand, when the vehicle is not operating (S18: NO), the control unit 29 shifts the processing to S14.

According to the steam system 1 of the present embodiment described above, the following effects can be obtained.
The steam system 1 includes a flash steam generator 20, a steam booster 30, a temperature sensor 31 for detecting a steam temperature on a suction side of the steam booster 30, and a temperature for detecting a steam temperature on a discharge side of the steam booster 30. It is configured to include a sensor 32, a pressure sensor 33 for detecting a steam pressure on the discharge side of the steam booster 30, and a control unit 29 for controlling start and stop of the steam booster 30. The control means 29 determines that the temperature of the steam on the discharge side of the steam booster 30 is equal to or higher than the saturation temperature corresponding to the pressure of the steam on the discharge side, and the temperature of the steam on the suction side of the steam booster 30 is 100 ° C. or higher. When the state of is maintained for the first time set in advance, the steam booster 30 is started. Accordingly, the activation of the steam booster 30 is prohibited until the temperature of the flash steam S3 supplied to the primary side of the steam booster 30 reaches 100 ° C., and the flash steam S3 is sent to the steam booster 30. 1 The steam booster 30 is started in a state where the steam supply line 22 is sufficiently warmed. Therefore, even if the steam booster 30 is provided with a function of stopping when the discharge-side temperature becomes lower than the saturation temperature, it is possible to prevent a situation in which the steam booster 30 frequently starts and stops.

  Further, the control unit 29 determines that the temperature of the steam on the discharge side of the steam booster 30 is lower than the saturation temperature corresponding to the pressure of the steam, or the temperature of the steam on the suction side of the steam booster 30 is lower than 100 ° C. In this case, the operation of the steam booster 30 is stopped. Accordingly, even when the temperature of the flash steam S3 supplied from the suction side decreases while the pressure on the discharge side of the steam booster 30 is maintained, the operation of the steam booster 30 is stopped. Therefore, even if the condensation of the flash steam S3 occurs on the suction side of the steam booster 30, the drain does not enter the active compression working chamber, and the risk of abnormality and failure of the steam booster 30 is further reduced. Can be.

  Further, the flash steam generator 20 includes a flash tank 21 for re-evaporating the collected steam drain D to separate it into flash steam S3 and hot water W, a drain collection line L21 for collecting the steam drain D into the flash tank 21, A steam supply line L22 for supplying the flash steam S3 from the flash tank 21 to the steam booster 30, a drain discharge line L23 for discharging the hot water W from the flash tank 21, an inlet valve V22 provided on the drain recovery line L21, A flow path switching unit 28 including a plurality of control valves including at least a steam air supply valve V23 provided on the steam air supply line L22 and a drain discharge valve V24 provided on the drain discharge line L23. Is done. Thus, the flash steam generator 20 can be used as the steam generator. By controlling the control valve during operation of the flash steam generator 20, the flash steam S3 is sent to the steam booster 30, and the required medium-pressure steam can be obtained at low cost.

Although the preferred embodiment of the steam system of the present invention has been described above, the present invention is not limited to the above-described embodiment, and can be appropriately changed.
The steam system only needs to include a steam generator and a steam booster, and is not limited to, for example, the steam system of the present invention including high-pressure steam utilization equipment and medium-pressure steam utilization equipment.

  Further, in the present embodiment, the steam system 1 is configured to include the flash steam generator 20 as the steam generator, but is not limited to this. That is, the steam system may include a low-pressure steam generator of a shell-and-tube type or a low-pressure steam generator of a heat pump type.

  In the steam booster check process, it is determined whether the second condition and the third condition are satisfied in order, but they may be performed simultaneously.

DESCRIPTION OF SYMBOLS 1 Steam system 11 Steam boiler apparatus 12 Steam header 13 High pressure steam utilization equipment 14 Medium pressure steam utilization equipment 20 Flash steam generator 21 Flash tank 29 Control means 30 Steam booster 31, 32 Temperature sensor 33 Pressure sensor 40 Feedwater tank D Steam drain L21 Drain recovery line L22 Steam air supply line L23 Drain discharge line S3 Flash steam V22 Inlet valve V23 Steam air supply valve V24 Drain discharge valve W Hot water

Claims (3)

A steam generator,
A steam booster that boosts the steam generated by the steam generator,
Suction steam temperature detection means for detecting a steam temperature on the suction side of the steam pressure increasing device,
Discharge steam temperature detection means for detecting a steam temperature on the discharge side of the steam booster,
Discharge steam pressure detecting means for detecting a steam pressure on a discharge side of the steam pressure increasing device,
Control means for controlling the start and stop of the steam booster,
The control means may be configured such that the detected temperature of the discharged steam temperature detecting means is equal to or higher than the saturation temperature corresponding to the detected pressure of the discharged steam pressure detecting means, and the state where the detected temperature of the suction steam temperature detecting means is 100 ° C. or higher is determined in advance. A steam system for activating the steam booster when the set first time is continued.   The controller may be configured such that, during operation of the steam booster, the detected temperature of the discharged steam temperature detecting means is lower than a saturation temperature corresponding to the detected pressure of the discharged steam pressure detecting means, or the detected temperature of the suction steam temperature detecting means. The steam system according to claim 1, wherein when the temperature is lower than 100 ° C., the steam booster is stopped. The steam generator,
A flash tank for re-evaporating the collected steam drain to separate it into flash steam and hot water,
A drain collection line for collecting steam drain in the flash tank,
A steam supply line for supplying flash steam from the flash tank to the steam booster;
A drain discharge line for discharging hot water from the flash tank,
A flow path including a plurality of control valves including at least an inlet valve provided in the drain recovery line, a steam air valve provided in the steam air line, and a drain discharge valve provided in the drain air line. The steam system according to claim 1 or 2, further comprising a switching unit.

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