JP2014126233A - Drain recovery system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a drain recovery system capable of managing an operation state of load equipment and detecting abnormality of the same and capable of achieving the same with a simple construction.SOLUTION: A drain recovery system 16 comprises a flash tank 23, a first pressure sensor 31, a second pressure sensor 32, a third pressure sensor 33, a water level detector 34, a control device 36, a steam discharge line L21, a drain discharge line L22, a steam regulating valve V21, and a drain discharge valve V22. The control device 36 acquires an amount Gd of a flash tank outflowing drain and an amount Gf of a flash steam, calculates an amount G of a flash tank flowing-in drain based on the obtained amount Gd of a flash tank outflowing drain and the amount Gf of a flash steam, compares the obtained amount G of a flash tank flowing-in drain with a flow rate of drain 22 discharged from first load equipment 13, which is obtained from an operation signal of the first load equipment 13, and determines existence and nonexistence of abnormality in the operation state of the first load equipment 13.

Description

  The present invention relates to a drain recovery system that recovers drain discharged from a load device (steam use facility) that uses steam from a steam supply source such as a boiler as a heat source.

  Loaded equipment that uses steam as a heat source for heating, drying, distillation, etc., performance of the loaded equipment such as a decrease in heat exchange rate of the heat exchanger or steam trap steam leakage due to aging over time. Gradually decreases. Even if the load equipment deteriorates due to aging and the performance deteriorates, if the degree of performance deterioration of the load equipment does not increase, the user is likely not to notice the performance deterioration of the load equipment. As means for diagnosing whether or not the load device is operating normally, there is an abnormality determination device for the load device (steam-using device) (for example, see Patent Document 1).

  The abnormality determination device for a steam-using device described in Patent Document 1 includes a condensate amount generated by a steam-using device that is a load device, a supply steam pressure measured by a pressure sensor, and a recovery meter measured by a temperature sensor. The steam consumption actually consumed by the equipment using steam is calculated from the temperature of water. The abnormality determination device for the steam-using equipment compares the actual consumption of steam with the amount of steam supplied to the steam-using equipment to determine whether condensate is retained in the steam-using equipment. Diagnose abnormalities in steam-using equipment by determining whether steam-using equipment is operating normally, such as whether steam leaks in equipment used, etc., or if there is a lack of heat insulation. ing.

JP 04-151100 A

  Here, the drain discharged from the load equipment is collected in the flash tank, the flash steam is separated from the drain, and the collected drain and the flash steam separated from the drain are used as a steam supply source or a heat source for other equipment. There is a system. When the abnormality determination device for a steam using device described in Patent Document 1 is applied to a steam system including a flash tank, the abnormality determination device for the steam using device described in Patent Document 1 is a component of flash steam generated in the flash tank. In consideration of the above, it is not determined whether or not the steam-using device is operating normally. Therefore, it is not possible to sufficiently determine the performance degradation of the load device caused by the aging deterioration of the load device.

  Moreover, in the technique as described in Patent Document 1, a measuring device and the like for measuring the amount of condensate, the amount of supplied steam, the pressure, and the temperature are provided, so that the apparatus is complicated and expensive.

  The present invention has been made in view of the above, and provides a drain recovery system that can detect the abnormality by managing the operating state of a load device and that can be realized with a simple configuration. The purpose is to do.

  A drain recovery system according to the present invention recovers drain discharged from a load device, separates a flash vapor generated from the recovered drain, and is provided in the separator, and the drain of the drain in the separator A water level detection unit that detects a water level, a first pressure detection unit that is provided in the separation unit and detects a pressure in the separation unit, and is connected to the separation unit, and discharges the drain in the separation unit from the separation unit. A drain discharge line, a drain adjustment unit that is provided in the drain discharge line and adjusts a discharge amount of the drain flowing through the separation unit, and a steam that is connected to the separation unit and discharges the flash vapor from the separation unit A discharge line, a steam adjusting unit provided in the steam discharge line, for adjusting a discharge amount of the flash steam flowing through the steam discharge line, and the drain The separation unit obtained by receiving the separation unit outflow drain amount discharged from the separation unit and the flash vapor amount by which the flash vapor is discharged from the separation unit, and receiving the operation signal of the load device. The separation part inflow drain amount that the drain flows into the separation part is calculated based on the outflow drain amount and the flash steam amount, and the obtained separation part inflow drain amount is obtained from the operation signal of the load device. And a control unit that determines whether or not the operation state of the load device is abnormal by comparing with a threshold value indicating the operation state of the load device.

  As a preferable aspect of the present invention, a second pressure detection unit that is provided downstream of the drain adjustment unit of the drain discharge line and that measures the pressure in the drain discharge line, and the steam discharge line A third pressure detection unit that is provided downstream of the steam control unit in the steam flow direction and measures the pressure in the steam discharge line, and the control unit is obtained from the opening of the drain control unit. And calculating the separation unit outflow drain amount based on a differential pressure between the Cv value, the pressure measured by the second pressure detection unit, and the pressure measured by the first pressure detection unit, and the steam control unit Calculating the amount of flash vapor based on a Cv value obtained from the opening of the first pressure and a differential pressure between the pressure measured by the third pressure detector and the pressure measured by the first pressure detector. preferable.

  According to the present invention, it is possible to detect the abnormality by managing the operating state of the load device, and to realize it with a simple configuration.

It is a figure showing the schematic structure of the steam system provided with the drain recovery system concerning the embodiment of the present invention. It is a flowchart which shows an example of the procedure of the method which determines the presence or absence of the driving | running state abnormality of a 1st load apparatus.

  DESCRIPTION OF EMBODIMENTS Hereinafter, modes for suitably carrying out the present invention (hereinafter referred to as embodiments) will be described in detail. In addition, this invention is not limited by the content described in the following embodiment. In addition, constituent elements in the embodiments described below include those that can be easily assumed by those skilled in the art, those that are substantially the same, and those in a so-called equivalent range. Furthermore, the constituent elements disclosed in the embodiments described below may be appropriately combined, or may be appropriately selected and used.

<Steam system>
A steam system including a drain recovery system according to an embodiment of the present invention will be described. FIG. 1 is a diagram illustrating a schematic configuration of a steam system including a drain recovery system according to an embodiment of the present invention. As shown in FIG. 1, the steam system 10 includes a boiler (steam supply source) 11, a steam header 12, a first load device 13, a water supply tank 14, a second load device 15, and a drain recovery system 16. It has.

  The boiler 11 is a steam supply source that generates steam 21 by various heat source methods. As the boiler 11, various types such as a combustion boiler and an electric boiler can be used. In the case of the combustion type, the boiler 11 generates steam by heating the can water in the can body using the heat of combustion when the fuel is burned as a heat source. When the boiler 11 is of the combustion type, for example, a gas fuel such as city gas, propane gas, or biogas, or a liquid fuel such as heavy oil or kerosene is used as the fuel. In the case of the combustion type, the boiler 11 includes, for example, a once-through boiler, a furnace tube fired boiler, a water tube boiler, and the like. In the case of an electric type, the boiler 11 generates steam by heating can water in the can body using an electric heater or the like as a heat source.

  The boiler 11 is connected to the steam header 12 by the first steam supply line L11. The first steam supply line L11 is a line that connects the boiler 11 and the steam header 12. The steam 21 is sent from the boiler 11 to the steam header 12 through the first steam supply line L11.

  The steam header 12 is for storing the steam 21. In this embodiment, although one boiler 11 is provided, it is not limited to this, You may provide the several boiler. In this case, steam supplied from a plurality of boilers is collected in the steam header 12.

  The steam header 12 is connected to the first load device 13 through the second steam supply line L12. The second steam supply line L12 is a line that connects the steam header 12 and the first load device 13. The steam 21 is sent to the first load device 13 through the second steam supply line L12. The second steam supply line L12 is provided with a pressure reducing valve V11 and a steam supply valve V12 in the middle of the second steam supply line L12. The pressure reducing valve V11 keeps the pressure (back pressure) of the steam 21 downstream of the pressure reducing valve V11 in the second steam supply line L12 constant. The steam supply valve V12 is provided downstream of the pressure reducing valve V11 in the flow direction of the steam 21. The steam supply valve V12 adjusts the flow rate of the steam 21 supplied to the first load device 13 by adjusting the opening degree.

  The steam header 12 is connected to the steam discharge line L21 through the third steam supply line L13. The third steam supply line L13 is a line connecting the steam header 12 and the steam discharge line L21. The steam 21 is sent from the steam header 12 through the third steam supply line L13 to the steam discharge line L21 and is sent to the second load device 15. The configuration of the steam discharge line L21 will be described later.

  The first load device 13 uses the steam 21 supplied from the steam header 12 as a heating source or a power source. In the present embodiment, the first load device 13 uses the steam 21 as a heating source. When the steam 21 passes through the steam supply passage in the first load device 13, it loses latent heat and partially condenses to become high-pressure and high-temperature drain (condensed water) 22. The first load device 13 includes one or more load devices such as a high pressure steam load device or an intermediate pressure steam load device. Accordingly, the drain 22 is generated from the steam 21 used as a heating source in one or more load devices such as a high pressure steam load device or a medium pressure steam load device.

  The first load device 13 is connected to the flash tank 23 by a drain supply line L14. The first load device 13 uses the steam 21 supplied from the second steam supply line L12 as a heating source, and discharges the drain 22 generated when the steam 21 is used to the drain supply line L14. Further, the drain supply line L14 is provided with a steam trap 24 in the middle of the drain supply line L14. The steam trap 24 allows only the drain 22 discharged from the first load device 13 to pass through. After passing through the steam trap 24, the drain 22 is supplied to the flash tank 23 and collected in the flash tank 23. The configuration of the flash tank 23 will be described later.

  In addition, the drain supply line L <b> 14 is provided with a temperature sensor (temperature measurement unit) 25 between the steam trap 24 and the flash tank 23. The temperature sensor 25 detects the temperature of the drain 22 passing through the drain supply line L14. The temperature sensor 25 transmits an electrical signal corresponding to the detection result to the control device 34.

  In the drain supply line L14, a bypass line L15 is connected between the steam trap 24 and the flash tank 23. The bypass line L15 is a line connecting the drain supply line L14 and the drain discharge line L22. The configuration of the drain discharge line L22 will be described later. The bypass line L15 supplies the drain 22 to the water supply tank 14. The bypass line L15 is provided with an emergency discharge valve V13 in the middle of the bypass line L15. The emergency discharge valve V13 discharges the drain 22 flowing through the bypass line L15. When the water level in the flash tank 23 becomes higher than the normal setting range due to a failure of the drain discharge valve V22 or clogging in the drain discharge line L22, the emergency discharge valve V13 is opened and the drain 22 is The water is supplied to the water supply tank 14 through the bypass line L15 without passing through the flash tank 23.

  In the bypass line L15, a bypass drain discharge line L16 is connected between the drain supply line L14 and the emergency discharge valve V13. The bypass drain discharge line L16 is a line connecting the bypass line L15 and the blow discharge line L23. The bypass drain discharge line L16 supplies the drain 22 to the blow discharge line L23. The bypass drain discharge line L16 is provided with an emergency discharge valve V14 in the middle of the bypass drain discharge line L16. The opening and closing of the emergency discharge valve V14 is controlled based on a control signal sent from the control device 34.

  The water supply tank 14 is for storing the drain 22. The drain 22 in the water supply tank 14 is supplied to the boiler 11 as water 26 for generating steam 21. Further, when only the drain 22 supplied to the water supply tank 14 has insufficient water to be supplied to the boiler 11, the makeup water 27 is supplied to the water supply tank 14 and supplied to the boiler 11 as water 26.

  The third steam supply line L13 is provided with a pressure reducing valve V15 in the middle of the third steam supply line L13. The steam 21 sent from the steam header 12 to the third steam supply line L13 passes through the pressure reducing valve V15 and then becomes the pressure reduced steam 28. The steam 21 flowing from the steam header 12 through the third steam supply line L13 is supplied to the second load device 15 through the steam discharge line L21 as the reduced pressure steam 28 by the pressure reducing valve V15.

  The second load device 15 uses the flash steam 29 and the vacuum steam 28 discharged from the flash tank 23 as a heating source or a power source. The second load device 15 includes one or more low-pressure steam load devices. In the present embodiment, the second load device 15 preferentially uses the flash steam 29 as a heating source or a power source over the decompressed steam 28. The second load device 15 uses the reduced pressure steam 28 as a shortage when the amount of steam used in the second load device 15 is insufficient with only the flash steam 29.

(Drain collection system 16)
The drain recovery system 16 includes a flash tank (separation unit) 23, a first pressure sensor (first pressure detection unit) 31, a second pressure sensor (second pressure detection unit) 32, and a third pressure sensor (third Pressure detector) 33, water level detector (water level detector) 34, controller (control unit) 36, output unit 37, steam discharge line L21, drain discharge line L22, blow discharge line L23, A steam control valve (steam control unit) V21, a drain discharge valve (drain control unit) V22, and a blow discharge valve V23 are provided.

  The flash tank 23 collects the drain 22, and flash vapor 29 is generated from the collected drain 22. Since the pressure in the flash tank 23 is lower than that in the drain supply line L <b> 14, the flash steam 29 is generated from the drain 22 collected in the flash tank 23. The flash tank 23 is provided with a safety valve V24. When the pressure in the flash tank 23 becomes abnormally high, the safety valve V24 is opened to depressurize the flash tank 23.

  The steam discharge line L <b> 21 has one end connected to the flash tank 23 and the other end connected to the second load device 15. The steam discharge line L21 is a line for discharging the flash steam 29 from the flash tank 23. The steam discharge line L21 is provided with a pressure reducing valve V25 in the middle of the steam discharge line L21. The flash steam 29 passes from the flash tank 23 through the steam discharge line L21 and is decompressed by the decompression valve V25, and then is sent to the second load device 15. The second load device 15 uses the decompressed steam 28 together with the flash steam 29 as a heating source or a power source. The second load device 15 preferentially uses the flash steam 29, and uses the reduced-pressure steam 28 as steam that is not sufficient with the flash steam 29 alone. When the steam control valve V21 is closed and the flash steam 29 is not sent to the second load device 15, only the decompressed steam 28 is used as a heating source or a power source for the second load device 15.

  The steam control valve V21 is provided in the steam discharge line L21. The steam control valve V21 adjusts the flow rate of the flash steam 29 passing through the steam discharge line L21. The opening degree of the steam control valve V21 is adjusted based on a control signal sent from the control device 36.

  In the steam discharge line L21, a check valve V26 is provided between the third pressure sensor 33 and the pressure reducing valve V25. The check valve V26 prevents the reduced-pressure steam 28 from flowing to the flash tank 23 side.

  In the steam discharge line L21, an internal pressure adjustment line L24 is connected between the flash tank 23 and the steam control valve V21. The internal pressure adjusting line L24 discharges a part of the flash steam 29 from the steam discharge line L21 to the outside. The internal pressure adjusting line L24 is provided with an internal pressure adjusting valve V27 in the middle of the internal pressure adjusting line L24. When the pressure in the steam discharge line L21 becomes equal to or higher than the predetermined pressure, the internal pressure control valve V27 opens the internal pressure control valve V27 to release the pressure to the outside, and the pressure in the steam discharge line L21 is higher than the predetermined pressure. It is used to adjust so that it does not become.

  The drain discharge line L22 has one end connected to the flash tank 23 and the other end connected to the water supply tank 14. The drain discharge line L22 is a line for discharging the drain 22 from the flash tank 23. The drain 22 flows from the flash tank 23 into the water supply tank 14 through the drain discharge line L22.

  The drain discharge valve V22 is provided in the drain discharge line L22. The drain discharge valve V22 adjusts the discharge amount of the drain 22 flowing through the drain discharge line L22. The opening degree of the drain discharge valve V22 is adjusted based on a control signal sent from the control device 36.

  In the drain discharge line L22, a check valve V28 is provided between the drain discharge valve V22 and a position where the drain discharge line L22 is connected to the bypass line L15. The check valve V28 prevents the drain 22 from flowing toward the flash tank 23 when flowing into the bypass line L15.

  The blow discharge line L23 is connected to the flash tank 23. The blow discharge line L23 is a line for discharging the drain 22 from the flash tank 23 to the outside.

  The blow discharge valve V23 is provided in the blow discharge line L23. The blow discharge valve V23 discharges the drain 22 flowing through the blow discharge line L23.

  The first pressure sensor 31 is provided in the flash tank 23. The first pressure sensor 31 detects the pressure in the flash tank 23.

  The second pressure sensor 32 is provided between the drain discharge valve V22 and the check valve V28 in the drain discharge line L22. The second pressure sensor 32 detects the pressure in the drain discharge line L22.

  The third pressure sensor 33 is provided between the steam control valve V21 and the check valve V26 in the steam discharge line L21. The third pressure sensor 33 detects the pressure in the steam discharge line L21.

  The water level detector 34 is provided outside the flash tank 23. The water level detector 34 detects the water level of the drain 22 in the flash tank 23. The water level detector 34 includes a water level detection cylinder 41, a float 42, and a water level sensor 43. The water level detection cylinder 41 is provided on the side surface outside the flash tank 23. The water level detection cylinder 41 is communicated with the bottom of the flash tank 23 through a communication pipe 45 on the bottom surface on the lower side. Further, the water level detection cylinder 41 is communicated with the upper side of the flash tank 23 through the communication pipe 46 on the side surface on the upper side. The water level sensor 43 detects the water level of the drain 22 in the water level detection cylinder 41 by detecting the height of the float 42 provided in the water level detection cylinder 41. In the water level detection cylinder 41, the drain 22 flows from the flash tank 23 through the connection pipe 45 therein, so that the water level of the drain 22 in the flash tank 23 and the water level of the drain 22 in the water level detection cylinder 41 become substantially equal. For this reason, the water level sensor 43 can detect the water level of the drain 22 in the water level detection cylinder 41 by detecting the height of the float 42 in the water level detection cylinder 41. In the present embodiment, the discharge amount for discharging the drain 22 from the flash tank 23 is adjusted based on the water level of the drain 22 in the flash tank 23 detected by the water level detector 34.

  The temperature sensor 25, the first pressure sensor 31, the second pressure sensor 32, the third pressure sensor 33, and the water level detector 34 each transmit an electrical signal corresponding to the detection result to the control device 36.

  The control device 36 controls each part of the drain recovery system 16. The control device 36 is a microcomputer including an input / output unit, a memory (storage unit), a RAM (Random Access Memory), and a CPU (Central Processing Unit). The output unit manages an interface operation with each of the above components. The memory stores a control program executed by the CPU such as predetermined data and an arithmetic program. The RAM stores calculation results and is used as a work area. The CPU controls the entire system. In the present embodiment, the control device 36 records a map indicating the correlation between the operation signal of the first load device 13 and the flow rate of the drain 22 discharged from the first load device 13 in the memory.

  In the present embodiment, the operation signal of the first load device 13 is a signal representing the operation state of the first load device 13 when the first load device 13 is being operated. A signal indicating whether the vehicle is operating at a predetermined ratio (for example, 70%, 80%, 90%, etc.) or a signal of the steam supply valve V12.

  The control device 36 is electrically connected to various sensors attached to the drain recovery system 16 such as the temperature sensor 25, the first pressure sensor 31, the second pressure sensor 32, the third pressure sensor 33, and the water level detector 34. Has been. Further, the control device 36 receives an operation signal of the first load device 13. Electrical signals corresponding to the detection results of these various sensors and the operation signals of the first load device 13 are input to the control device 36 via an external input circuit. Based on various electrical signals input from various sensors and operation signals of the first load device 13, the control device 36 performs various valves such as an emergency discharge valve V13, V14, a steam control valve V21, and a drain discharge valve V22. The control signals are output to and controlled.

(Control of drain discharge valve V22)
The control device 36 measures the water level of the drain 22 in the flash tank 23 from the detection result of the water level sensor 43. The control device 36 outputs a control signal to the drain discharge valve V22 based on the water level of the drain 22 in the flash tank 23 detected by the water level sensor 43, and adjusts the opening of the drain discharge valve V22. The amount of drain 22 discharged to the discharge line L22 is adjusted. Accordingly, the control device 36 can adjust the flow rate of the drain 22 discharged from the flash tank 23 according to the flow rate of the drain 22 flowing into the flash tank 23.

(Abnormality judgment of operation state of first load device 13)
The control device 36 includes the opening degree of each of the steam control valve V21 and the drain discharge valve V22, the detection results of various sensors such as the first pressure sensor 31, the second pressure sensor 32, and the third pressure sensor 33, and the first Based on the operation signal of the one load device 13, the abnormality determination of the operation state of the first load device 13 is performed. In the present embodiment, as described above, the operating state of the first load device 13 is, for example, whether the first load device 13 is in steady operation or at a predetermined rate (for example, 70%, 80%, 90%, etc.). For example, a signal indicating whether the vehicle is driving.

  An example of a procedure of a method for determining whether or not the operating state of the first load device 13 is abnormal will be described with reference to FIG. FIG. 2 is a flowchart illustrating an example of a procedure of a method for determining whether or not the operation state of the first load device 13 is abnormal. As shown in FIG. 2, in step S <b> 11, the control device 36 calculates respective Cv values from electric signals corresponding to the opening degrees of the steam control valve V <b> 21 and the drain discharge valve V <b> 22. The Cv value is a numerical value indicating the capacity coefficient of the valve, the valve opening is kept constant, the differential pressure before and after the valve is kept at 1 psi (6.895 kPa), and 60 ° F. (about 15.5). ° C) is a numerical value representing the amount of water flowing per minute in US gal / min (1 US gal = 3.785 L). After calculating the respective Cv values of the steam control valve V21 and the drain discharge valve V22, the control device 36 proceeds to step S12.

In step S12, the control device 36 determines the Cv value obtained from the electrical signal corresponding to the opening of the drain discharge valve V22, the pressure obtained from the electrical signal detected by the second pressure sensor 32, and the first pressure sensor. Based on the differential pressure with the pressure obtained from the electrical signal detected at 31, a flush tank outflow drain amount (flash tank outflow drain amount) Gd from which the drain 22 is discharged from the flash tank 23 is calculated. Further, the control device 36 uses the Cv value obtained from the electrical signal corresponding to the opening degree of the steam control valve V <b> 21, the pressure obtained from the electrical signal detected by the third pressure sensor 33, and the first pressure sensor 31. Based on the differential pressure with the pressure obtained from the detected electrical signal, the flash steam amount Gf discharged from the flash tank 23 by the flash steam 29 is calculated. Then, the control device 36 calculates a flash tank inflow drain amount (a separation unit inflow drain amount) G into which the drain 22 flows into the flash tank 23 based on the obtained flash tank outflow drain amount Gd and the flash steam amount Gf. To do. The flush tank inflow drain amount G is the flow rate of the drain 22 that has flowed into the flash tank 23. The flash tank inflow drain amount G is obtained from the sum of the flash tank outflow drain amount Gd and the flash steam amount Gf as in the following formula (1).
Flash tank inflow drain amount G = Flash tank outflow drain amount Gd + Flash vapor amount Gf (1)

  The control device 36 receives the operation signal of the first load device 13. The control device 36 compares the obtained flash tank inflow drain amount G with a threshold value indicating the operation state of the first load device 13 obtained from the operation signal of the first load device 13. The flash tank inflow drain amount G is the amount of the drain 22 flowing into the flash tank 23 and corresponds to the flow rate of the drain 22 discharged from the first load device 13. The control device 36 uses the map indicating the correlation between the operation signal of the first load device 13 recorded in advance in the interior and the flow rate of the drain 22 discharged from the first load device 13 to determine the first load device 13. The flow rate of the drain 22 discharged from the first load device 13 corresponding to the operation signal is calculated. The control device 36 compares the flush tank inflow drain amount G with the flow rate of the drain 22 discharged from the first load device 13 corresponding to the operation signal of the first load device 13, and actually enters the flash tank 23. It is determined whether the drain amount thus obtained is substantially equal to the drain amount originally flowing into the flash tank 23. Thereby, the control apparatus 36 can judge whether the driving | running state of the 1st load apparatus 13 is abnormal.

  The threshold value indicating the operation state of the first load device 13 is the normal operation of the first load device 13 when the operation state of the first load device 13 is represented by the flow rate of the drain 22 discharged from the first load device 13. This is the lower limit value or the upper limit value of the flow rate of the drain 22 that is allowed as operating. When the threshold indicating the operating state of the first load device 13 is the lower limit value of the flow rate of the drain 22, if the flush tank inflow drain amount G is equal to or greater than the lower limit value of the flow rate of the drain 22, Since the inflow drain amount is equal to or greater than the drain amount originally flowing into the flash tank 23, the control device 36 determines that the operation state of the first load device 13 is normal. Further, when the threshold indicating the operating state of the first load device 13 is the upper limit value of the flow rate of the drain 22, if the flush tank inflow drain amount G is less than or equal to the upper limit value of the flow rate of the drain 22, the flash tank is actually Since the drain amount that has flowed into 23 is originally equal to or less than the normal value of the drain amount that flows into the flash tank 23, the control device 36 determines that the operating state of the first load device 13 is normal.

  The control device 36 controls the opening degree of the steam control valve V21 and the drain discharge valve V22, the differential pressure between the pressure in the steam discharge line L21 and the pressure in the flash tank 23, the pressure in the drain discharge line L22, and the flash tank 23. The flash tank inflow drain amount Gd and the flash steam amount Gf are calculated from the pressure difference from the internal pressure to obtain the flash tank inflow drain amount G. Since the control device 36 measures the drain 22 and the flash vapor 29 discharged from the flash tank 23, the flow rate of the drain 22 flowing into the flash tank 23 can be accurately calculated.

  After calculating the flush tank inflow drain amount G, the control device 36 proceeds to step S13. In step S13, it is determined whether or not the operating state of the first load device 13 is abnormal.

  The control device 36 receives the operation signal of the first load device 13. The control device 36 can obtain a threshold value indicating the operation state of the first load device 13 from the operation signal of the first load device 13. As described above, the control device 36 uses the flow rate of the drain 22 discharged from the first load device 13 according to the operation state of the first load device 13 as a threshold value indicating the operation state of the first load device 13, for example. Ask. The control device 36 uses the obtained flash tank inflow drain amount G and the drain 22 discharged from the first load device 13 as a threshold value indicating the operation state of the first load device 13 obtained from the operation signal of the first load device 13. Compare the flow rate. Then, the control device 36 determines whether or not the operation state of the first load device 13 is abnormal.

  The control device 36 compares the flush tank inflow drain amount G with the flow rate of the drain 22 discharged from the first load device 13 obtained based on the operation signal of the first load device 13. As a result, for example, when the flush tank inflow drain amount G significantly increases or decreases, the control device 36 determines that the flow rate of the drain 22 calculated as being discharged from the first load device 13 is normally the first load. It is determined that the flow rate of the drain 22 discharged from the device 13 has increased or decreased, and it is determined that an abnormality has occurred in the operation of the first load device 13. Examples of cases where an abnormality has occurred in the operation of the first load device 13 include clogging or leakage in a passage through which the steam 21 or the drain 22 in the first load device 13 passes.

  The control device 36 transmits the detection result calculated as described above to the output unit 37 based on various electrical signals input from various sensors.

  The output unit 37 outputs the operation information of the drain collection system 16 based on the detection result transmitted from the control device 36. The output unit 37 outputs the operation information based on the detection result calculated by the control device 36, so that, for example, whether the performance of the first load device 13 is deteriorated or the operation state is abnormal due to, for example, lighting of a lamp or an alarm. Let me know.

  As described above, in the drain recovery system 16, the controller 36 detects the opening degree of each of the steam control valve V <b> 21 and the drain discharge valve V <b> 22 and the detection of the first pressure sensor 31, the second pressure sensor 32, and the third pressure sensor 33. Based on the result, the flash tank inflow drain amount Gd and the flash steam amount Gf are calculated to obtain the flash tank inflow drain amount G. Further, the control device 36 calculates the flow rate of the drain 22 discharged from the first load device 13 based on the operation signal of the first load device 13. Then, the control device 36 compares the flush tank inflow drain amount G with the flow rate of the drain 22 discharged from the first load device 13 obtained based on the operation signal of the first load device 13. Since the flash tank inflow drain amount G is calculated based on the flash tank outflow drain amount Gd and the flash steam amount Gf, the control device 36 actually uses the flash tank inflow drain amount G to supply the flash tank 23 to the flash tank 23. The flow rate of the drain 22 that has flowed in can be calculated. Therefore, the drain recovery system 16 compares the flow rate of the drain 22 obtained based on the operation signal of the first load device 13 by using the calculated flush tank inflow drain amount G, so that the first load device It is possible to manage the 13 operating states and detect the abnormality.

  Further, the drain recovery system 16 can calculate the flush tank inflow drain amount G based on the steam control valve V21, the drain discharge valve V22, the first pressure sensor 31, the second pressure sensor 32, and the third pressure sensor 33. . Therefore, the drain recovery system 16 can easily obtain the flush tank inflow drain amount G without complicating the configuration.

  In addition, the drain recovery system 16 outputs the fact that the performance of the first load device 13 has deteriorated or an abnormality has occurred in the operation state by the output unit 37, so that the first load device 13 is activated by, for example, lamp lighting or an alarm. It is possible to notify the worker that the performance may be degraded due to deterioration over time, or that the operating state of the first load device 13 may be abnormal. Accordingly, the worker can easily recognize that the performance of the first load device 13 or the like has deteriorated or an abnormality has occurred in the operating state, and thus the first load device 13 or the like whose performance has deteriorated due to deterioration. Parts can be replaced or repaired quickly. As a result, the drain recovery system 16 can suppress a decrease in operating efficiency of the first load device 13 and the like.

  The present invention is not limited to the above-described embodiments, and various changes can be made without departing from the spirit of the invention. For example, in the present embodiment, the water level detector 34 employs a float type that detects the liquid level based on the position of a float that has a lighter specific gravity than the drain 22, but is not limited to this. In addition, a known water level such as an electrode rod method using an electrode rod, a water pressure detection type that detects the liquid level based on the water level of the drain 22, and a capacitance type that detects the capacitance that changes depending on the length of the electrode immersed in the drain. You may use the apparatus which employ | adopted the detection method.

  In the present embodiment, the drain discharge line L22 and the blow discharge line L23 are connected to the flash tank 23, but the present invention is not limited to this, and the blow discharge line L23 is the drain discharge line. It may be provided in the middle of L22, specifically, between the flash tank 23 and the drain discharge valve V22, or the drain discharge line L22 may be provided in the middle of the blow discharge line L23, specifically with the flash tank 23. You may branch and provide from between the blow discharge valves V23.

  Further, in the present embodiment, the drain 22 discharged from the flash tank 23 or the drain 22 passing through the bypass line L15 is supplied to the water supply tank 14 so that the drain 22 is stored only by the water supply tank 14. It is not limited to this. For example, the drain discharge line L22 is on the upstream side of the water supply tank 14, and specifically, a drain tank is provided separately from the water supply tank 14 between the connection point to the bypass line L15 and the water supply tank 14. The drain 22 may be stored in the drain tank.

  In the present embodiment, the Cv value obtained from the electrical signal corresponding to the opening of the drain discharge valve V22, the pressure measured by the second pressure sensor 32, and the pressure measured by the first pressure sensor 31 The flush tank outflow drain amount Gd is calculated on the basis of the differential pressure of the flow rate. However, the present embodiment is not limited to this, and a flow meter is provided in the drain discharge line L22. Then, the flush tank outflow drain amount Gd may be measured.

  In the present embodiment, the case where the drain 22 discharged from the first load device 13 is collected using the flash tank 23 has been described. However, the present embodiment is not limited to this, and the flash steam Conventionally known drain collection containers that do not take out 29 can be similarly applied.

10 Steam system 11 Boiler (steam supply source)
12 Steam header 13 First load device 14 Water supply tank 15 Second load device 16 Drain recovery system 21 Steam 22 Drain 23 Flash tank (separation part)
24 Steam Trap 25 Temperature Sensor (Temperature Measurement Unit)
26 Water 27 Makeup Water 28 Depressurized Steam 29 Flash Steam 31 First Pressure Sensor (First Pressure Detection Unit)
32 2nd pressure sensor (2nd pressure detection part)
33 3rd pressure sensor (3rd pressure detection part)
34 Water level detector (water level detector)
36 Control device (control unit)
37 Output part 41 Water level detection cylinder 42 Float 43 Water level sensor 45, 46 Connecting pipe G Flash tank inflow drain amount (separation part inflow drain amount)
Gd Flash tank outflow drain amount (separation part outflow drain amount)
Gf Flash steam amount L11 1st steam supply line L12 2nd steam supply line L13 3rd steam supply line L14 Drain supply line L15 Bypass line L16 Bypass drain discharge line L21 Steam discharge line L22 Drain discharge line L23 Blow discharge line L24 For internal pressure adjustment Line V11, V15, V25 Pressure reducing valve V12 Steam supply valve V13, V14 Emergency discharge valve V21 Steam control valve (steam control unit)
V22 Drain discharge valve (drain adjustment part)
V23 Blow discharge valve V24 Safety valve V26, V28 Check valve V27 Internal pressure control valve

Claims (2)

A separation unit that collects drain discharged from the load device and separates flash vapor generated from the collected drain;
A water level detection unit that is provided in the separation unit and detects a water level of the drain in the separation unit;
A first pressure detection unit that is provided in the separation unit and detects a pressure in the separation unit;
A drain discharge line connected to the separation unit and discharging the drain in the separation unit from the separation unit;
A drain adjusting unit that is provided in the drain discharge line and adjusts an amount of drain discharged through the separation unit;
A steam discharge line connected to the separation unit and discharging the flash vapor from the separation unit;
A steam control unit that is provided in the steam discharge line and adjusts the discharge amount of the flash steam flowing through the steam discharge line;
The drain is discharged from the separator, and the amount of drain drain discharged from the separator and the amount of flash steam discharged from the separator are respectively acquired, and the operation signal of the load device is input and obtained. The separation unit inflow drain amount in which the drain flows into the separation unit is calculated based on the separation unit outflow drain amount and the flash vapor amount, and the obtained separation unit inflow drain amount is used as an operation signal of the load device. A control unit that determines whether or not the operating state of the load device is abnormal, by comparing with a threshold value indicating the operating state of the load device obtained from:
A drain recovery system comprising: In claim 1,
A second pressure detection unit that is provided on the downstream side in the drain flow direction with respect to the drain adjustment unit of the drain discharge line and measures the pressure in the drain discharge line;
A third pressure detection unit that is provided on the downstream side in the steam flow direction of the steam discharge line with respect to the steam discharge line and measures the pressure in the steam discharge line;
The control unit is based on a differential pressure between the Cv value obtained from the opening degree of the drain adjustment unit, the pressure measured by the second pressure detection unit, and the pressure measured by the first pressure detection unit. While calculating the said separation part outflow drain amount, the Cv value obtained from the opening degree of the said steam control part, the pressure measured by the said 3rd pressure detection part, and the pressure measured by the said 1st pressure detection part, A drain recovery system that calculates the amount of flash vapor based on the pressure difference between the two.

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