Management system and management methods

Abstract

The present invention provides a management system and a management method that can improve the effectiveness of valve solidification prevention. The management system includes: a temperature acquisition unit (3) for acquiring temperature data from a temperature sensor (1) installed on the valve body; a temperature storage unit (4) for storing the temperature data; a solidification prevention condition storage unit (5) for storing the relationship between the temperature of the valve body and the duration of the temperature when solidification of the valve body did not occur in past investigations as solidification prevention conditions; a heating state determination unit (6) for comparing the temperature of the valve body after the heating process is restarted in the temperature storage unit (4) with the solidification prevention conditions to determine whether the heating of the valve body is sufficient when the heating process is restarted in the device on which the valve body is installed; and a determination result prompting unit (7) for prompting the determination result of the heating state determination unit.

Description

Technical Field

[0001] This invention relates to a management system and a management method for managing valves. Background Technology

[0002] Valves used in petrochemical facilities, etc. (e.g.) Figure 8 The control valves must be given special attention for safety, so they are regularly maintained. Figure 8 The control valve shown includes: a valve body 100 for opening and closing a passage for fluid flow; a positioner 101 for converting an input electrical signal into air pressure; and an actuator 102 for operating the valve body 100 according to the air pressure supplied from the positioner 101.

[0003] In the settings Figure 8 In the valve assembly shown, in order to improve the efficiency of valve maintenance operations, technologies have been proposed for detecting the occurrence of stick-slip in the sliding part of the valve (see Patent Document 1), determining the hunting state of the valve (see Patent Document 2), and detecting the adhesion of scale to the valve (see Patent Document 3), etc.

[0004] On the other hand, as a different type of valve from control valves that allow continuous changes in opening, there are on-off valves that can only have the opening in two positions: fully open or fully closed. Examples include ball valves, butterfly valves, or gate valves. Figure 9 The illustrated on / off valve 200 uses a ball valve, which consists of a valve body structure where a ball 202 is enclosed by a seat ring 203 called a ball-seat. The valve stem 204 is rotated 90 degrees by an actuator 206, thereby opening or closing the valve. To prevent fluid leakage within the valve body 205, a gasket 207 is provided in the gap between the valve body 205 and the valve stem 204.

[0005] In a typical ball valve, there is a dead space, also known as an air pocket, between the valve body 205 and the ball 202. Figure 9 If fluid is trapped in the air bag section 208, the fluid may become stagnant. The fluid trapped and solidified in the air bag section 208 may sometimes cause the valve body 201 to become stuck, resulting in malfunction.

[0006] Figure 10 (A) indicates the normal fully open state of valve body 201. Figure 10 (B) represents the normal fully closed state. On the other hand, Figure 10(C) indicates a state where the process fluid 209 is trapped and solidified inside the gas bag section 208, and the valve body 201 remains fully open and cannot be closed. Figure 10 (D) indicates a state that remains fully closed and cannot be opened.

[0007] Especially in equipment handling process fluids such as polymer resins that are solid at room temperature (high viscosity), the on / off valve 200 is highly susceptible to solidification. For example, in... Figure 11 In the example shown, process fluids such as raw materials or solvents are metered into the polymerization reactor 300 via switching valves 200-1 and 200-2, and a polymerization reaction begins in the polymerization reactor 300 to generate a polymer resin in solid or semi-solid form.

[0008] In this type of equipment, the piping or valve body is heated (heated or kept warm) by means of steam tracing or electric tracing to prevent the process fluid from solidifying. Figure 12 The example shown illustrates a steam tracing piping 302 arranged along piping 301-1 to piping 301-3 and valve bodies 201-1 to valve bodies 201-3 of valves 200-1 to 200-3. However, relying on steam tracing or electric tracing is sometimes insufficient to prevent valve sticking, and improvements are sought.

[0009] [Existing Technical Documents]

[0010] [Patent Literature]

[0011] Patent Document 1: Japanese Patent No. 3254624

[0012] Patent Document 2: Japanese Patent Application Publication No. 2015-114942

[0013] Patent Document 3: Japanese Patent Application Publication No. 2015-114943 Summary of the Invention

[0014] [The problem the invention aims to solve]

[0015] This invention was made to solve the aforementioned problems, and its purpose is to provide a management system and method for improving the effectiveness of valve consolidation prevention.

[0016] [Technical means to solve the problem]

[0017] The management system of the present invention includes: a temperature acquisition unit configured to acquire temperature data from a temperature sensor provided on the valve body; a temperature storage unit configured to store the temperature data; a consolidation prevention condition storage unit configured to store the relationship between the temperature of the valve body and the duration of the temperature when consolidation of the valve body did not occur in past investigations as a consolidation prevention condition; a heating state determination unit configured to, when the heating process of the valve body is restarted in a device provided with the valve body, compare the temperature of the valve body after the restart of the heating process stored in the temperature storage unit with the duration of the temperature with the consolidation prevention condition to determine whether the heating of the valve body is sufficient; and a determination result prompting unit configured to prompt the determination result of the heating state determination unit.

[0018] Furthermore, one embodiment of the management system of the present invention further includes a heating command output unit configured to output a heating command to the control device for heating treatment when the valve body is not sufficiently heated, so as to increase the heating temperature of the heating treatment after restarting from the normal set temperature, or extend the duration of the heating treatment after restarting.

[0019] Furthermore, one structural example of the management system of the present invention is characterized in that the heating command output unit estimates the duration of the temperature at which the solidification prevention condition is satisfied based on the temperature of the valve body after the heating process restarts and the solidification prevention condition, and outputs the heating command so that the duration of the heating process after restarting is greater than or equal to the estimated duration.

[0020] Furthermore, one structural example of the management system of the present invention is characterized in that the heating command output unit estimates the temperature of the valve body that meets the solidification prevention condition based on the predetermined duration of the heating treatment and the solidification prevention condition, and outputs the heating command so that the heating temperature of the heating treatment after restarting is above the estimated temperature.

[0021] Furthermore, the management method of the present invention includes: a first step of acquiring temperature data from a temperature sensor provided on the valve body; a second step of storing the temperature data; a third step of, when the heating treatment of the valve body is restarted in a device in which the valve body is provided, referring to a storage unit that stores the relationship between the temperature of the valve body and the duration of the temperature when the valve body did not solidify in past investigations as a solidification prevention condition, comparing the temperature of the valve body after the restart of the heating treatment in the data stored in the second step with the solidification prevention condition to determine whether the temperature rise of the valve body is sufficient; and a fourth step of displaying the determination result of the third step.

[0022] Furthermore, one structural example of the management method of the present invention further includes: a fifth step, when the valve body is not sufficiently heated, outputting a heating command to the control device for the heating process, so as to increase the heating temperature of the heating process after restarting from the normal level set temperature, or extend the duration of the heating process after restarting.

[0023] Furthermore, a structural example of the management method of the present invention is characterized in that, in the fifth step, based on the temperature of the valve body after the heating treatment restarts and the solidification prevention condition, the duration of the temperature at which the solidification prevention condition is satisfied is estimated, and the heating command is output so that the duration of the heating treatment after restarting is greater than or equal to the estimated duration.

[0024] Furthermore, a structural example of the management method of the present invention is characterized in that, in the fifth step, the temperature of the valve body that satisfies the solidification prevention condition is estimated based on the predetermined duration of the heating treatment and the solidification prevention condition, and the heating command is output so that the heating temperature of the heating treatment after restarting is above the estimated temperature.

[0025] [The effects of the invention]

[0026] According to the present invention, by providing a temperature acquisition unit, a temperature storage unit, a solidification prevention condition storage unit, and a heating state determination unit, it is possible to determine whether the heating of the valve body is sufficient, thereby enabling the implementation of countermeasures corresponding to the determination result, and thus improving the effectiveness of the valve's solidification prevention. Attached Figure Description

[0027] Figure 1 This is a block diagram illustrating the structure of the management system according to an embodiment of the present invention.

[0028] Figure 2 This is a flowchart illustrating the operation of the management system according to an embodiment of the present invention.

[0029] Figure 3 This is a block diagram illustrating the structure of a temperature sensor according to an embodiment of the present invention.

[0030] Figure 4 This is a diagram illustrating an example of the results of a preliminary investigation into the relationship between the temperature of the valve body and the duration of the temperature.

[0031] Figure 5 This is a diagram showing an example of the installation location of a temperature sensor according to an embodiment of the present invention.

[0032] Figure 6 This is a diagram showing an example of the installation position of the heat tracing piping according to an embodiment of the present invention.

[0033] Figure 7This is a block diagram illustrating an example of the structure of a computer that implements an embodiment of the management system of the present invention.

[0034] Figure 8 This is a diagram illustrating an example of a control valve.

[0035] Figure 9 This is a diagram illustrating an example of a switching valve.

[0036] Figure 10 This diagram illustrates the malfunction caused by the solidification of the switching valve.

[0037] Figure 11 This is a diagram illustrating an example of polymerization process equipment.

[0038] Figure 12 This diagram illustrates the steam tracing process for polymerization equipment.

[0039] [Explanation of Symbols]

[0040] 1: Temperature sensor

[0041] 2: Valve ID Storage Section

[0042] 3: Temperature Acquisition Unit

[0043] 4: Temperature storage unit

[0044] 5: Storage section for preventing consolidation

[0045] 6: Temperature rise status determination unit

[0046] 7: Judgment Result Prompt Section

[0047] 8: Heating command output unit

[0048] 10: Temperature Measurement Department

[0049] 11: Valve ID Storage Department

[0050] 12: Sending Department Detailed Implementation

[0051] [Principles of the Invention]

[0052] In the following description, steam tracing is described as a representative example of heating treatment. Sometimes the equipment equipped with the switching valve may be stopped or steam tracing may be temporarily stopped. When operation resumes, steam tracing will restart. The inventors have discovered that if the switching valve body is not sufficiently heated when steam tracing is restarted, the switching valve may solidify and become immobile.

[0053] Therefore, the inventors conceived of a way to measure the temperature of the valve body within the switching valve, to pre-determine the relationship between the temperature, its duration, and the solidification of the valve body, thereby determining whether the heating is sufficient. Furthermore, in this invention, if the heating is ultimately determined to be insufficient, simply increasing the steam tracing output or extending the duration can improve the effectiveness (effect) of preventing solidification.

[0054] Alternatively, preferably, the formal process of the equipment is restarted only after the occurrence / elimination of valve jamming has been confirmed by detecting the valve opening and the air pressure (torque) of the operator.

[0055] This invention is particularly effective for valves with an air pocket section that can cause consolidation. Besides ball valves, plug valves are another example of valves with an air pocket section. However, this invention is also applicable to valves other than ball valves or plug valves.

[0056] [Example]

[0057] Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. Figure 1 This is a block diagram illustrating the structure of a management system according to an embodiment of the present invention. In this embodiment, for the sake of brevity, examples of valve identifiers (IDs) are simpler than those used in actual facilities.

[0058] The management system includes: a temperature sensor 1 for measuring the temperature of the valve body; a valve ID storage unit 2 for pre-storing the ID (identification information) of the valve including the temperature sensor 1; a temperature acquisition unit 3 for acquiring temperature data from the temperature sensor 1; a temperature storage unit 4 for storing the temperature data along with the ID of the valve that is the source of the data; a solidification prevention condition storage unit 5 for storing the relationship between the valve body temperature and the duration of the temperature when solidification of the valve body did not occur in past investigations as a solidification prevention condition; a heating state determination unit 6 for comparing the valve body temperature and the duration of the temperature during the previous heating process stored in the temperature storage unit 4 with the solidification prevention condition when the heating process of the valve body is restarted in a device equipped with a valve, in order to determine whether the heating of the valve body is sufficient; a determination result prompting unit 7 for prompting the determination result of the heating state determination unit 6; and a heating command output unit 8 for outputting a heating command to the heating process control device when the heating of the valve body is insufficient, so as to increase the heating temperature of the restarted heating process from the normal set temperature or extend the duration of the restarted heating process.

[0059] Figure 2This is a flowchart illustrating the operation of the management system in this embodiment. In this embodiment, for example, it is assumed that there are 26 switching valves in the facility, and each of these 26 switching valves is pre-assigned a unique ID such as "VA", "VB", "VC", ..., "VX", "VY", "VZ". In this embodiment, it is particularly assumed that the switching valves with valve IDs "VA", "VC", and "VM" are steam-traced target switching valves, and their IDs "VA", "VC", and "VM" are pre-stored in the valve ID storage unit 2. For example, suppose... Figure 11 , Figure 12 The ID of the switching valve 200-1 is “VA”, the ID of the switching valve 200-2 is “VC”, and the ID of the switching valve 200-3 is “VM”.

[0060] Figure 3 This is a block diagram showing the structure of a temperature sensor 1 installed on a switching valve. The temperature sensor 1 includes: a temperature measuring unit 10 for measuring the temperature of the valve body of the switching valve; a valve ID storage unit 11 for storing the valve ID inherent to the switching valve on which the temperature sensor 1 is installed; and a transmitting unit 12 for periodically transmitting temperature data and the valve ID to the management system.

[0061] The temperature acquisition unit 3 of the management system receives temperature data from the temperature sensors 1 of each switching valve. Figure 2 Step S100), and save the received temperature data, along with the valve ID and the time of temperature data reception attached to the temperature data, to the temperature storage unit 4. Figure 2 Step S101). In this way, the temperature data of each switching valve is always stored in the temperature storage unit 4.

[0062] In the consolidation prevention condition storage unit 5 of the management system, the relationship between the valve body temperature and its duration when consolidation of the switching valve has not occurred in a prior investigation is stored as a consolidation prevention condition. In the prior investigation, for the target switching valve (the switching valve equipped with temperature sensor 1 and whose ID has been stored in the valve ID storage unit 2), the degree of consolidation of the switching valve can be investigated by appropriately changing the valve body temperature and the duration of the temperature by changing the steam heating conditions, and by detecting the valve opening degree and the actuator air pressure (torque).

[0063] When consolidation occurs in the switching valve, such as Figure 10 (C) Figure 10As shown in (D), the valve remains fully open even when the actuator air pressure is adjusted to be fully closed, or the valve remains fully closed even when the actuator air pressure is adjusted to be fully open. Therefore, by detecting the valve opening and actuator air pressure, it is possible to determine whether the valve has become stuck, and to collect the valve body temperature and its duration when stuck occurs, as well as the valve body temperature and its duration when stuck does not occur. Thus, based on the collected data, the relationship between the valve body temperature and its duration when stuck does not occur can be derived.

[0064] Furthermore, in practical terms, there is no problem as long as the conditions (the relationship between temperature and duration) under which consolidation will not occur are identified. That is, it is not necessary to explore the critical conditions under which consolidation will occur, but only to store the conditions that allow consolidation to not occur in the consolidation prevention condition storage unit 5.

[0065] Techniques for detecting the opening degree of a switching valve and the actuator air pressure supplied to the valve's actuator are disclosed, for example, in Japanese Patent Application Publication No. 2021-026268.

[0066] When steam tracing is restarted in equipment equipped with a switching valve, the temperature rise status determination unit 6 of the management system compares the valve body temperature and the duration of the temperature after the restart of steam tracing, which are stored in the temperature storage unit 4, with the solidification prevention conditions stored in the solidification prevention condition storage unit 5, in order to determine whether the temperature rise of the valve body is sufficient for each switching valve. Figure 2 Step S102).

[0067] The temperature rise determination unit 6 only needs to compare the latest maximum temperature Tmax of the valve body up to the current time and the duration of the maximum temperature Tmax stored in the temperature storage unit 4 with the solidification prevention conditions. More specifically, the temperature rise determination unit 6 only needs to compare the average temperature of the range Tmax to Tmax-α (α is a specified temperature) before and after the latest maximum temperature Tmax of the valve body and the duration of the range with the solidification prevention conditions.

[0068] The management system's judgment result prompting unit 7 prompts the operator with the judgment result of the temperature rise status judgment unit 6. Figure 2 Step S103). For all switching valves whose valve IDs are registered in the valve ID storage unit 2, the judgment result prompting unit 7 can prompt (display) either "insufficient heating" or "no problem with heating", or prompt (display) the ID of the switching valve whose heating is insufficient.

[0069] If an operator confirms the indicated result and finds that at least one switching valve is not sufficiently heated, it can be determined that there is a possibility of valve jamming. Furthermore, the operator can manually increase the steam tracing temperature (steam temperature) or extend the steam tracing duration to eliminate valve jamming.

[0070] Furthermore, the process of eliminating the solidification of the switching valve can be performed automatically without manual operation by the operator, as follows.

[0071] Specifically, the heating command output unit 8 of the management system determines, based on the determination result obtained by the heating state determination unit 6, that at least one switching valve is not sufficiently heated ( Figure 2 In step S104 (yes), a heating command is output to the steam tracing control device to increase the steam tracing temperature from the normal set temperature by a specified increase or to extend the duration of steam tracing. Figure 2 Step S105).

[0072] As described above, since the temperature data of each switching valve is always accumulated in the temperature storage unit 4, when a heating command is output from the heating command output unit 8 to the steam tracing control device, the determination performed by the temperature rise status determination unit 6 can be performed. Figure 2 (Step S106). Similarly, the heating state determination unit 6 only needs to compare the highest temperature Tmax of the valve body after the heating command is output with the solidification prevention condition. More specifically, the heating state determination unit 6 only needs to compare the average temperature of the range Tmax to Tmax-α before and after the highest temperature Tmax and the duration of the range with the solidification prevention condition.

[0073] If the heating command output unit 8 of the management system outputs a heating command and the heating status determination unit 6 determines that all switching valves whose valve IDs are registered in the valve ID storage unit 2 have been sufficiently heated, then... Figure 2 In step S107 (yes), a recovery command is output to the steam tracing control device to restore the steam tracing to its normal level. Figure 2 Step S108).

[0074] If the heating temperature of the steam tracing has been increased by a previous heating command, the temperature is restored to the normal set temperature, and the steam tracing ends at the point when the predetermined steam tracing duration has elapsed. Furthermore, if the steam tracing duration has been extended beyond the predetermined duration, the steam tracing ends at the point when a recovery command is output from the heating command output unit 8.

[0075] Thus, whenever steam tracing is performed, the processes of steps S102 to S108 are carried out.

[0076] An example of the results of a preliminary investigation into the relationship between the temperature of the valve body and the duration of the temperature is shown below. Figure 4 The data is fictitious for the sake of simplicity, but in reality... Figure 4 The data shown. Figure 4 In the diagram, ● symbol 40 indicates that valve consolidation has not occurred, and × symbol 41 indicates that consolidation has occurred.

[0077] When the temperature of the valve body is T and the duration of temperature T is S, the solidification prevention condition is given as AS+BT>1.0 (A and B are coefficients obtained from the data). Figure 4 In the example, 0.0221S + 0.00426T > 1.0 is a condition specified for the region that includes cases where valve consolidation has not occurred. The region is divided into those containing cases where valve consolidation has not occurred and those containing cases where consolidation has occurred. Figure 4 The equation for line 42 is 0.0221S + 0.00426T = 1.0.

[0078] Therefore, in the consolidation prevention condition storage unit 5, it is sufficient to store at least the formula of the straight line as the consolidation prevention condition. At this time, the temperature rise determination unit 6 determines that the valve body is sufficiently heated when the temperature T and duration S stored in the temperature storage unit 4 satisfy 0.0221S+0.00426T>1.0, and determines that the temperature rise is insufficient when 0.0221S+0.00426T≦1.0 is true.

[0079] Figure 4 The example shown illustrates how a straight line can be used to divide a region containing the case where valve consolidation has not occurred into a region containing the case where consolidation has occurred. However, in cases where it is appropriate to use curves such as higher-order functions for region segmentation, it is sufficient to define the consolidation prevention condition using a higher-order function.

[0080] When it is not easy to increase the valve body temperature T by steam tracing, the duration S required to satisfy the consolidation prevention condition can be estimated. In this case, the valve body temperature T is a fixed value, and A and B are known values ​​according to the consolidation prevention condition. Therefore, the heating command output unit 8 can estimate the appropriate duration S such that S > (1.0 - BT) / A. The heating command output unit 8 outputs a heating command so that the duration of steam tracing becomes greater than or equal to the estimated value S.

[0081] Furthermore, when the duration of steam tracing cannot be easily changed, the temperature T of the valve body that satisfies the consolidation prevention condition can be estimated. In this case, the duration S of temperature T is a known time from the point in time when the appropriate temperature T is to be estimated until the steam tracing ends, and A and B are also known values ​​according to the consolidation prevention condition. Therefore, the heating command output unit 8 can estimate the appropriate valve body temperature T such that T > (1.0 - AS) / B. The heating command output unit 8 outputs a heating command to make the steam tracing heating temperature above the estimated temperature T.

[0082] However, the above estimation method is a simplified approach for simplification. In practice, it is more preferable to estimate the appropriate duration S by considering the change in the valve body temperature T. In this case, the duration S can be estimated by taking the average valve body temperature Tm after the steam tracing restarts as a reference, such that S > (1.0 - BTm) / A. Alternatively, a more robust calculation method is to calculate the average temperature Tm by accumulating the valve body temperature for each unit measurement time after the steam tracing restarts and dividing it by the historical steam tracing time.

[0083] Specifically, with the valve body temperature T consistently at 150°C (Tm = T = 150), the required duration S is calculated to be 16.3 hours (approximately 16 hours and 20 minutes) as shown in Equation (1) below.

[0084] S>(1.0-BT) / A=(1.0-0.00426×150) / 0.0221=16.3…(1)

[0085] Furthermore, the degree or condition of solidification varies depending on the type (shape, size) of the valve or its installation status, therefore it is preferable to collect the solidification data separately for each valve. Figure 4 Such data is used to set solidification prevention conditions individually. However, when conditions such as type or setup are similar, solidification prevention conditions can be applied from similar on / off valves. Furthermore, the values ​​of A and B, where AS+BT>1.0, can of course be calculated manually by the operator, or appropriately calculated using commonly known multivariate analysis methods.

[0086] Figure 5 This diagram shows an example of the installation position of the temperature sensor 1 in this embodiment. The temperature sensor 1 can be installed at at least one of the following locations: the valve stem 204 of the valve body 201 of the switching valve 200, inside the valve body 205, the gasket 207, and the air bag portion 208.

[0087] In addition, when multiple temperature sensors 1 are provided, for example, the average temperature measured by the multiple temperature sensors 1 can be used for the determination of the heating state determination unit 6, or the lowest temperature among the temperatures measured by the multiple temperature sensors 1 can be used for determination.

[0088] Figure 6 This is a diagram showing an example of the installation location of the heat tracing piping 302 for steam heat tracing. (See diagram for example.) Figure 6 As shown, the heat tracing piping 302 is installed, for example, by winding around the valve body 201 of the switching valve 200.

[0089] In addition, in this embodiment, a steam heating device (steam heat tracing) that supplies steam to heat the heat tracing pipe 302 is used as an example of a heating device that heats the switch valve 200. However, it is not limited to this. The present invention can also be applied to devices that include a heating device (electric heat tracing) that supplies electricity to an electric heater installed on the switch valve 200 and the pipe 301 for heating.

[0090] The management system described in this embodiment can be implemented using a computer including a central processing unit (CPU), storage devices, and interfaces, along with a program that controls these hardware resources. The structure of the computer is illustrated below. Figure 7 The computer includes a CPU 400, a storage device 401, and an interface (I / F) device 402. The I / F 402 may include, for example, temperature sensors 1 connecting to each of the switching valves, a display, or a control device for the heating process. In this type of computer, a program for implementing the management method of the present invention is stored in the storage device 401. The CPU 400 executes the processing described in this embodiment according to the program stored in the storage device 401.

[0091] [Potential for Industrial Applications]

[0092] This invention is applicable to techniques for preventing valve solidification.

Claims

1. A management system, characterized in that, include: The temperature acquisition unit is configured to acquire temperature data from a temperature sensor located on the valve body. The temperature storage unit is configured to store the temperature data; The consolidation prevention condition storage unit is configured to store the relationship between the temperature of the valve body and the duration of the temperature when consolidation of the valve body has not occurred in past investigations as a consolidation prevention condition. The temperature rise determination unit is configured to, when the heating process of the valve body is restarted in the device on which the valve body is provided, compare the temperature of the valve body after the restart of the heating process and the duration of the temperature stored in the temperature storage unit with the solidification prevention condition to determine whether the temperature rise of the valve body is sufficient. The determination result prompting unit is configured to prompt the determination result of the heating state determination unit; as well as The heating command output unit is configured to output a heating command to the heating treatment control device when the valve body is not sufficiently heated, so as to increase the heating temperature of the restarted heating treatment from the normal set temperature, or extend the duration of the restarted heating treatment. The heating command output unit estimates the temperature of the valve body that meets the solidification prevention condition based on the predetermined duration of the heating treatment and the solidification prevention condition, and outputs the heating command so that the heating temperature of the heating treatment after restarting is above the estimated temperature.

2. The management system according to claim 1, characterized in that, The heating command output unit estimates the duration of the temperature that satisfies the solidification prevention condition based on the temperature of the valve body after the heating process restarts and the solidification prevention condition, and outputs the heating command so that the duration of the heating process after restarting is greater than or equal to the estimated duration.

3. A management method, characterized in that, include: The first step is to obtain temperature data from the temperature sensor located on the valve body; The second step is to store the temperature data; The third step involves restarting the heating process of the valve body in the device equipped with the valve body. Referring to the storage unit that stores the relationship between the temperature and the duration of the temperature of the valve body when the valve body did not solidify in the past investigation as a solidification prevention condition, the temperature and duration of the valve body after the heating process restarts in the data stored in the second step are compared with the solidification prevention condition to determine whether the temperature rise of the valve body is sufficient. The fourth step is to display the determination result of the third step; as well as The fifth step involves sending a heating command to the heating control device when the valve body is not sufficiently heated. This command either increases the heating temperature of the restarted heating process from the normal set temperature or extends the duration of the restarted heating process. In the fifth step, based on the predetermined duration of the heating treatment and the solidification prevention condition, the temperature of the valve body that meets the solidification prevention condition is estimated, and the heating command is output so that the heating temperature of the heating treatment after restarting is above the estimated temperature.

4. The management method according to claim 3, characterized in that, In the fifth step, based on the temperature of the valve body after the heating treatment restarts and the solidification prevention condition, the duration of the temperature that satisfies the solidification prevention condition is estimated, and the heating command is output so that the duration of the heating treatment after restarting is greater than or equal to the estimated duration.

Images