JP2017090020A - Monitoring system for steam use facility - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a monitoring system which enables a countermeasure against abnormality in pressure of steam supplied to a steam use device to be promptly taken when the same occurs.SOLUTION: A monitoring system 40 for a steam use facility comprises: a pressure sensor 46 which detects supply pressure of steam supplied to a steam use device; an input section 42 to which data on the supply pressure detected by the pressure sensor 46 is transmitted; a determination section 43 which determines abnormality in the data on the supply pressure transmitted to the input section 42; a storage section 44 which preliminarily stores causal factors which bring about the abnormality in the supply pressure; and a monitor 45 which performs alarm display of the abnormality in the supply pressure including an indication of the causal factor thereof stored in the storage section 44 when the determination section 43 determines the same.SELECTED DRAWING: Figure 4

Description

  The present application relates to a monitoring system for a steam using facility including a steam using device that heats an object with steam.

  For example, as disclosed in Patent Document 1, a steam using facility including a steam using device that heats an object with steam is known. This steam-using facility is a corrugated sheet manufacturing apparatus (also called a corrugated machine), and has a heating roll (also called a rotating roll) that is a steam-using device. The heating roll is one in which high-temperature and high-pressure steam is supplied to the inside and indirectly heats the external cardboard sheet. The steam supplied to the heating roll exchanges heat with the corrugated cardboard sheet to become drain, and is discharged to the discharge path.

JP 2008-207345 A

  By the way, as a monitoring system for monitoring the operating state of the steam-using facility as described above, for example, the supply pressure of steam to the steam-using equipment is monitored, and if the supply pressure is abnormal, that fact is notified (alarm is performed). ) There are things. However, the worker at the site may not be able to easily find out the cause of the notified abnormality, so that the abnormality cannot be quickly dealt with. For this reason, some or all of the steam-using equipment may have to be stopped for a long time.

  The technology disclosed in the present application has been made in view of such circumstances, and the purpose thereof is to promptly cope with the abnormality at least when an abnormality occurs in the supply pressure of steam to the steam-using device. It is to provide a monitoring system that can be used.

  In order to achieve the above object, the monitoring system for steam using equipment of the present application displays the contents of the abnormality and the cause of the abnormality when the abnormality occurs.

  Specifically, the technique disclosed in the present application is premised on a monitoring system for a steam using facility provided with steam using equipment that supplies steam and heats an object with the supplied steam. The monitoring system includes a pressure sensor, an input unit, a determination unit, a storage unit, and a display unit. The pressure sensor detects a supply pressure of steam to the steam-using device. The input unit transmits the supply pressure detected by the pressure sensor. The determination unit determines whether or not the supply pressure transmitted to the input unit is abnormal. The storage unit stores in advance a cause that causes the supply pressure to become abnormal. When the determination unit determines that the supply pressure is abnormal, the display unit displays that the supply pressure is abnormal and also displays the cause of the supply pressure stored in the storage unit being abnormal. .

  As described above, according to the monitoring system for steam using equipment of the present application, when an abnormality occurs in the supply pressure of steam to the steam using equipment, not only the supply pressure is abnormally displayed on the display unit, The cause of the abnormal supply pressure is also displayed on the display. In other words, not only the abnormality content but also the cause of the abnormality can be displayed. Thereby, since the operator can grasp | ascertain the cause of abnormality easily, it can cope with abnormality rapidly. Therefore, it is possible to avoid a situation where the steam using facility is stopped for a long time.

FIG. 1 is a piping system diagram showing a schematic configuration of a steam using facility according to an embodiment. FIG. 2 is a piping diagram showing a drain discharge system of the steam using facility according to the embodiment. FIG. 3 is a schematic configuration diagram illustrating the steam using device according to the embodiment. FIG. 4 is a block diagram illustrating a schematic configuration of the monitoring system according to the embodiment. FIG. 5 is a diagram illustrating an example of display contents of the monitor according to the embodiment. FIG. 6 is a diagram illustrating an example of display contents of the monitor according to the embodiment. FIG. 7 is a piping diagram showing a drain discharge system of a steam using facility according to another embodiment.

  Hereinafter, embodiments of the present application will be described with reference to the drawings. Note that the following embodiments are essentially preferable examples, and are not intended to limit the scope of the technology disclosed in the present application, applications thereof, or uses thereof.

  A steam use facility 1 shown in FIG. 1 is a corrugated cardboard manufacturing apparatus (also referred to as a corrugated machine). The steam use facility 1 includes a plurality (seven in this embodiment) of steam use devices 30 for heating the cardboard sheet. The steam using device 30 is a heating roll (also referred to as a rotating roll) that is supplied with steam and heats a corrugated cardboard sheet that is an object by the supplied steam.

<Composition of steam use equipment>
As shown in FIG. 1, the steam using facility 1 includes a steam supply system 10 for supplying steam to the steam using device 30. The steam supply system 10 includes a main supply pipe 11, a plurality (seven in this embodiment) of supply pipes 13, and a header 14.

  The main supply pipe 11 is supplied with high-temperature and high-pressure steam from a boiler. The outflow end of the main supply pipe 11 is connected to the header 14. The main supply pipe 11 is provided with two main valves 15 and 16. The upstream main valve 15 is a manual valve, and the downstream main valve 16 is an electric valve. The main supply pipe 11 is provided with a bypass pipe 12 that bypasses the two main valves 15 and 16. That is, the inflow end of the bypass pipe 12 is connected to the upstream side of the manual main valve 15 in the main supply pipe 11, and the outflow end of the bypass pipe 12 is connected to the downstream side of the electric main valve 16 in the main supply pipe 11. Has been. The bypass pipe 12 is provided with two bypass valves 17 and 18. The upstream bypass valve 17 is a manual valve, and the downstream bypass valve 18 is an electric valve. The manual main valve 15 and the bypass valve 17 are so-called flow rate adjusting valves whose opening degree can be changed continuously or stepwise. The electric main valve 16 and the bypass valve 18 are turned off in two stages, fully open and fully closed. It is a substitute. The bypass pipe 12 has a smaller diameter than the main supply pipe 11, and the bypass valves 17 and 18 have a smaller diameter than the main valves 15 and 16. That is, the steam flow rate in the bypass pipe 12 is smaller than the steam flow rate in the main supply pipe 11.

  The plurality of supply pipes 13 are individual pipes that supply steam to each of the plurality of steam using devices 30. Specifically, two of the seven supply pipes 13 are connected to the main supply pipe 11 and the steam using device 30. That is, the two supply pipes 13 have an inflow end connected to the downstream side of the bypass pipe 12 in the main supply pipe 11 and an outflow end connected to the steam using device 30. Five of the seven supply pipes 13 are connected to the header 14 and the steam using device 30. That is, the five supply pipes 13 have an inflow end connected to the header 14 and an outflow end connected to the steam using device 30. Each supply pipe 13 is provided with one manual supply valve 19. In the steam supply system 10 configured as described above, the steam in the main supply pipe 11 is supplied to the two steam using devices 30 through the respective supply pipes 13 and to the header 14. The steam supplied to the header 14 is supplied to five steam using devices 30 through the respective supply pipes 13.

  A drain discharge system 20 is connected to each steam using device 30. That is, the steam using facility 1 according to the present embodiment includes seven drain discharge systems 20. As shown in FIG. 2, the drain discharge system 20 includes a discharge pipe 21 that is connected to the steam using device 30 and from which the drain generated by the steam using device 30 is discharged. The discharge pipe 21 is provided with an upstream valve 22, a strainer 23, a steam trap 24, a check valve 25, and a downstream valve 26 in order from the upstream side. The upstream side valve 22 and the downstream side valve 26 are manual valves. The strainer 23 removes foreign matters contained in the drain. A blow pipe 27 is connected to the blow portion 23 a of the strainer 23, and a blow valve 28 is provided on the blow pipe 27. The steam trap 24 automatically discharges only the drained water to the downstream side. The check valve 25 allows only a fluid flow from the upstream side to the downstream side (from the left side to the right side in FIG. 2).

  As shown in FIG. 3, the steam using device 30 includes a roll body 31 and a siphon tube 33. The roll body 31 is a hollow cylindrical body extending along the axis X, and is configured to be able to accommodate steam therein. A shaft portion 32a and a shaft portion 32b extending along the axis X are provided at both ends of the roll body 31, and both shaft portions 32a and 32b are rotatably supported by bearings (not shown). That is, the roll body 31 is supported so as to be rotatable about the axis X. The roll body 31 is supported with the axis X extending in the horizontal direction. The supply pipe 13 is connected to one of the shaft portions 32a, and steam is supplied from the supply pipe 13 to the inside of the roll body 31 through the inside of the shaft portion 32a. The steam supplied into the roll main body 31 is condensed by exchanging heat with the corrugated cardboard sheet in contact with the outer peripheral surface of the roll main body 31, and the corrugated cardboard sheet is heated. The steam condenses and becomes drainage and accumulates at the bottom in the roll body 31.

  The siphon tube 33 penetrates the roll body 31 via the shaft portion 32a. The siphon tube 33 extends from the shaft portion 32 a along the axis X to the inside of the roll body 31 and then bends toward the bottom of the roll body 31. The inflow end (right end in FIG. 3) of the siphon tube 33 is close to the inner peripheral surface of the roll body 31 at the bottom of the roll body 31. The outflow end (left end in FIG. 3) of the siphon tube 33 extends outward from the roll body 31 along the shaft center X from the shaft portion 32 a. A discharge pipe 21 is connected to the outflow end of the siphon pipe 33. In the steam using device 30, the drain is discharged from the siphon tube 33 to the discharge tube 21 by the pressure of the steam supplied into the roll body 31.

  In the steam use facility 1 described above, the pressure increasing operation is first performed, and when the steam supply pressure to the steam using device 30 (hereinafter also simply referred to as supply pressure) reaches a predetermined pressure, the normal operation is performed. In the boost operation, the main valve 16 is closed, and the main valve 15 and the bypass valves 17 and 18 are opened. Further, the supply valve 19, the upstream valve 22 and the downstream valve 26 are opened, and the blow valve 28 is closed. In this step-up operation, the steam from the boiler passes through only the bypass valves 17 and 18 without passing through the main valve 16, so that steam is supplied little by little to each steam using device 30. Thereby, it can prevent that supply pressure rises at a stretch. When the supply pressure rises to a predetermined pressure, the main valve 16 is opened and normal operation is started. That is, in the normal operation, all of the main valves 15 and 16 and the bypass valves 17 and 18 are opened, so that the supply flow rate of steam to each steam using device 30 increases compared to that during the boost operation.

<Configuration of monitoring system>
The monitoring system 40 of this embodiment monitors the operation state of the steam use facility 1 described above. As shown in FIG. 4, the monitoring system 40 includes a control device 41, a monitor 45, a pressure sensor 46, and a plurality (seven in this embodiment) of temperature sensors 47.

  The pressure sensor 46 is provided in the header 14 (see FIG. 1), and detects the vapor pressure of the header 14. Since the header 14 communicates with the seven supply pipes 13, the vapor pressure of the header 14 corresponds to the vapor pressure of each supply pipe 13. That is, the pressure sensor 46 detects the supply pressure of the steam to each steam using device 30. One temperature sensor 47 is provided for each of the seven drain discharge systems 20. Specifically, the temperature sensor 47 is provided between the strainer 23 and the steam trap 24 in the discharge pipe 21 (see FIG. 2). The temperature sensor 47 detects the drain temperature of the discharge pipe 21 as the temperature of the steam using device 30. Since the drain generated in the steam using device 30 is discharged from the discharge pipe 21, the drain temperature of the discharge pipe 21 substantially corresponds to the temperature of the steam using device 30 (hereinafter also referred to as roll temperature).

  The control device 41 includes an input unit 42, a determination unit 43, and a storage unit 44. The input unit 42 receives the supply pressure detected by the pressure sensor 46 and the roll temperature detected by each temperature sensor 47. The determination unit 43 determines whether or not the supply pressure transmitted to the input unit 42 is abnormal. Specifically, the determination unit 43 determines that the supply pressure is abnormal when the supply pressure transmitted to the input unit 42 is lower than a predetermined pressure set in advance. Further, the determination unit 43 determines whether or not the roll temperature transmitted to the input unit 42 is abnormal. Specifically, the determination unit 43 determines that the roll temperature is abnormal when the roll temperature transmitted to the input unit 42 is lower than a predetermined temperature set in advance. The storage unit 44 stores in advance a plurality of causes that cause the supply pressure to be abnormal (that is, items that are considered to be the cause of the supply pressure abnormality). The storage unit 44 stores in advance a plurality of causes that cause the roll temperature to be abnormal (that is, items that are considered to be the cause of the roll temperature abnormality). Details of the cause of abnormal supply pressure and the cause of abnormal roll temperature will be described later.

  When the determination unit 43 determines that there is an abnormality, the monitor 45 displays the details of the abnormality and the cause of the abnormality, and constitutes a display unit according to the claims of the present application. That is, when the determination unit 43 determines that the supply pressure is abnormal, the monitor 45 displays that the supply pressure is abnormal and also displays a plurality of causes that cause the supply pressure stored in the storage unit 44 to be abnormal. . A specific example will be described with reference to FIG. On the monitor 45, “supply pressure drop” is displayed as an indication that the supply pressure is abnormal (upper left in FIG. 5). The monitor 45 displays three cause matters (hereinafter referred to as cause matters 1 to 3) as cause matters that cause the supply pressure to become abnormal. Cause 1 is “boiler operating state”. If the boiler operating state is abnormal, the supply pressure is reduced. Cause 2 is “manual valve open / closed state”. The manual valves here are the main valve 15 and the bypass valve 17. When at least one of the main valve 15 and the bypass valve 17 is closed, the supply pressure is reduced. Cause 3 is “the open / close state of the electric valve”. The electric valves here are the main valve 16 and the bypass valve 18. During the pressure increasing operation, if the bypass valve 18 is closed, the supply pressure is reduced. During normal operation, if at least one of the main valve 16 and the bypass valve 18 is closed, the supply pressure will decrease. For the cause items 1 to 3 displayed in this way, the operator performs a confirmation operation.

  Furthermore, the order in which the confirmation work is performed on the above three cause matters 1 to 3 is displayed on the monitor 45. In other words, the monitor 45 displays which cause item should be prioritized from among a plurality of cause items. The priorities of the cause items are in the order of high possibility as the cause of the abnormality. On the monitor 45 shown in FIG. 5, the fact that confirmation is made in the order of the cause matters 1 to 3 described above is displayed.

  Further, when the determination unit 43 determines that the roll temperature is abnormal, the monitor 45 displays that the roll temperature is abnormal and also displays a plurality of causes that cause the roll temperature stored in the storage unit 44 to be abnormal. . A specific example will be described with reference to FIG. On the monitor 45, “roll temperature drop” is displayed as an indication that the roll temperature is abnormal (upper left in FIG. 6). The monitor 45 displays three cause matters (hereinafter referred to as cause matters 1 to 3) as cause matters that cause the roll temperature to be abnormal. Cause 1 is “open / close state of supply valve 19, upstream valve 22, and downstream valve 26”. If at least one of the supply valve 19, the upstream valve 22, and the downstream valve 26 is closed, the drain is not discharged from the steam using device 30 to the discharge pipe 21. Then, since no new steam is supplied to the steam using device 30, the temperature (roll temperature) of the steam using device 30 decreases, and since the drain does not flow through the discharge pipe 21, the drain temperature (corresponding to the roll temperature) decreases. . Cause 2 is “clogging of the strainer 23, clogging of the screen in the steam trap 24, clogging of the orifice in the steam trap 24”. When these clogs are generated, the drain temperature is not discharged from the steam using device 30 to the discharge pipe 21 as in the cause item 1, so that the roll temperature is lowered. Note that the blow valve 28 is opened before the cause 2 is confirmed. If the decrease in the roll temperature is not improved even when the blow valve 28 is opened, it can be estimated that the cause of the decrease in the roll temperature is not the cause 2. On the contrary, if the roll temperature drop is improved by opening the blow valve 28, the cause 2 is confirmed. Cause 3 is “the state inside the roll”. Specifically, it is whether or not the siphon tube 33 is damaged. If the siphon tube 33 is bent or broken, the drain in the roll body 31 is not discharged from the siphon tube 33. That is, if the siphon tube 33 is damaged, the drain temperature is not discharged from the steam using device 30 to the discharge tube 21 as in the cause item 1, so that the roll temperature is lowered.

  The operator performs a confirmation operation for the cause items 1 to 3 in which the roll temperature displayed as described above becomes abnormal. Further, the monitor 45 displays the order in which the confirmation work is performed for the cause matters 1 to 3 in which the roll temperature becomes abnormal as in the case of the supply pressure abnormality. The priorities of the cause items are in the order of high possibility as the cause of the abnormality. On the monitor 45 shown in FIG. 6, the fact that confirmation is made in the order of the above-mentioned cause matters 1 to 3 is displayed.

  As described above, according to the monitoring system 40 of the above embodiment, when an abnormality occurs in the supply pressure of the steam to the steam using device 30, not only is the monitor 45 displayed that the supply pressure is abnormal, Causes that cause the supply pressure to become abnormal are also displayed on the monitor 45. That is, in the monitoring system 40 of the above embodiment, not only the content of the abnormality but also the cause of the abnormality is displayed. Thereby, since the operator can grasp | ascertain the cause of abnormality easily, it can cope with abnormality rapidly. Therefore, it is possible to avoid a situation where the steam using facility is stopped for a long time.

  Similarly, when an abnormality occurs in the temperature of the steam using device 30, the fact that the steam using device 30 is abnormal and the cause of the abnormality are displayed on the monitor 45. Therefore, it is possible to quickly cope with a temperature abnormality of the steam using device 30.

  Moreover, in the monitoring system 40 of the said embodiment, while displaying the some cause matter which becomes abnormal on the monitor 45, the order which confirms about the some cause matter was also displayed on the monitor 45. FIG. Thereby, it is possible to perform the confirmation work with priority from matters that are highly likely to be the cause of the abnormality. Therefore, it is possible to improve the efficiency of the confirmation work for the cause matter.

  Moreover, in the monitoring system 40 of the said embodiment, the temperature sensor 47 was provided in the discharge pipe 21, and the drain temperature of the discharge pipe 21 was detected as the temperature of the steam use apparatus 30. Thus, the temperature of the steam using device 30 can be detected without directly attaching the temperature sensor to the steam using device. Since the steam using device 30 is a heating roll that performs a rotating operation, it is difficult to attach a temperature sensor, but even in that case, according to the embodiment, the temperature of the steam using device 30 is easily detected. be able to.

(Other embodiments)
The above embodiment may be configured as follows.

  For example, as shown in FIG. 7, the drain discharge system 20 of the above embodiment may omit the blow pipe 27 and the blow valve 28 and provide a bypass pipe 29. Specifically, the inflow end of the bypass pipe 29 is connected to the upstream side of the upstream side valve 22 in the discharge pipe 21. The outflow end of the bypass pipe 29 is connected to the downstream side of the downstream side valve 26 in the discharge pipe 21. The bypass pipe 29 is provided with a manual bypass valve 29a. The bypass valve 29a is closed during the above-described boost operation and normal operation. In the case of this embodiment, the bypass valve 29a is opened before confirming the cause 2 of the roll temperature decrease described above. If the roll temperature drop is still not improved even when the bypass valve 29a is opened, it can be assumed that the cause of the roll temperature drop is not the cause 2. On the contrary, if the roll temperature drop is improved by opening the bypass valve 29a, the cause 2 is checked.

  Moreover, in the said embodiment, a temperature sensor may be attached to the steam use apparatus 30, and the temperature of the steam use apparatus 30 may be detected directly.

  Moreover, in the said embodiment, of course, the quantity of the steam usage apparatus 30 may be one, and may be two or more other than the quantity mentioned above.

  In the above embodiment, the steam using facility 1 may be other than the corrugated board manufacturing apparatus, and the steam using device 30 may be other than the heating roll.

  The technology disclosed in the present application is useful for a monitoring system for a steam using facility including a steam using device that heats an object with steam.

DESCRIPTION OF SYMBOLS 1 Steam use equipment 21 Discharge pipe 30 Steam use equipment 40 Monitoring system 42 Input part 43 Judgment part 44 Storage part 45 Monitor (display part)
46 Pressure sensor 47 Temperature sensor

Claims (5)

A steam use facility monitoring system comprising steam use equipment that is supplied with steam and heats an object with the supplied steam,
A pressure sensor for detecting the supply pressure of steam to the steam-using device;
An input unit to which the supply pressure detected by the pressure sensor is transmitted;
A determination unit for determining whether or not the supply pressure transmitted to the input unit is abnormal;
A storage unit in which the cause of the supply pressure abnormality is stored in advance;
When the determination unit determines that the supply pressure is abnormal, the display unit displays that the supply pressure is abnormal and includes a display unit that displays a cause for the supply pressure stored in the storage unit to be abnormal. A steam-use facility monitoring system. In the steam-use facility monitoring system according to claim 1,
Provided with a temperature sensor that detects the temperature of the steam-using device,
The input unit receives the temperature detected by the temperature sensor,
The determination unit determines whether the temperature transmitted to the input unit is abnormal,
In the storage unit, the cause matter that the temperature becomes abnormal is stored in advance,
When the determination unit determines that the temperature is abnormal, the display unit displays that the temperature is abnormal, and displays a cause that causes the temperature stored in the storage unit to be abnormal. Monitoring system for equipment used. In the monitoring system of the steam usage equipment according to claim 1 or 2,
The storage unit stores a plurality of causes that cause an abnormality,
The display unit displays a plurality of cause items that are abnormal and stored in the storage unit when the determination unit determines that there is an abnormality, and displays the order in which the confirmation work is performed for the plurality of cause items. A monitoring system for steam-using equipment. In the monitoring system of the steam use equipment according to any one of claims 1 to 3,
The steam using facility is connected to the steam using equipment, and includes a discharge pipe through which drain generated by condensing steam in the steam using equipment is discharged,
The said temperature sensor is provided in the said discharge pipe, The drain temperature of this discharge pipe is detected as the temperature of the said steam use apparatus, The monitoring system of the steam use equipment characterized by the above-mentioned. In the monitoring system of the steam use equipment according to any one of claims 1 to 4,
The steam using facility is a corrugated sheet manufacturing apparatus,
The steam-use equipment monitoring system, wherein the steam-use equipment is a heating roll that is supplied with steam and heats the cardboard sheet.

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