A control method for automatic queuing pressure replenishment and pressure relief of storage tanks

Abstract

The present application discloses a control method for automatic queuing pressure replenishment and pressure relief of storage tanks, comprising obtaining the pressure value in each storage tank; comparing the pressure value with a preset maximum pressure threshold, and sorting the storage tanks whose pressure values ​​are greater than the preset maximum pressure threshold in order of reaching the limit time; determining whether the pressure relief condition is met according to the state of each valve, and when it is met, opening the pressure relief main valve, and opening the vacuum pump, pressure relief sub-valve and gas phase balance valve corresponding to the storage tank that has reached the limit in sequence according to the sequence to achieve pressure relief; comparing the pressure value with a preset minimum pressure threshold, and sorting the storage tanks whose pressure values ​​are less than the preset minimum pressure threshold in order of reaching the limit time; determining whether the pressure replenishment condition is met according to the state of each valve, and when it is met, opening the pressure replenishment regulating valve, and opening the pressure replenishment sub-valve corresponding to each storage tank that has reached the limit in sequence according to the sequence to achieve pressure replenishment, which can achieve smooth control of the pressure relief and pressure replenishment process without manual operation and ensure normal production operation.

Description

Technical Field

[0001] The invention belongs to the technical field of chemical production, and in particular relates to a control method for automatic queuing pressure replenishment and pressure relief of storage tanks. Background Art

[0002] R125, also known as pentafluoroethane, has a chemical formula of CF3CHF2. It is a freon product that is mainly used as a refrigerant and can also be used as a propellant. In the semiconductor production process, it can be used as an etchant for oxides, a fire extinguisher, and a substitute for a foaming agent, etc. HF is one of the raw materials for producing R125. HF is a colorless gas with a pungent odor. If HF leaks during the production process, it will cause casualties because it is highly toxic and can be absorbed through the skin by the mucous membrane, respiratory tract, and gastrointestinal tract.

[0003] In the production process of R125, factors such as sudden weather changes, working condition adjustments and changes in production demand will cause changes in the pressure of the storage tank containing HF. In order to ensure the normal progress of production, the existing technology requires internal operators to perform pressure replenishment and pressure relief operations on site, specifically manually opening equipment such as vacuum units, cut-off valves and pressure regulating valves. Since internal operators need to operate multiple devices and need to pay attention to the pressure of the storage tank at all times, in order to ensure production and safety, the pressure cannot be too high or too low, which is very cumbersome to operate. In addition, when the internal operators have bad operating habits or are negligent, it will cause untimely pressure replenishment / pressure relief, which may lead to production accidents or environmental accidents. If the circumstances are serious, it may even cause the shutdown of the device, resulting in significant property losses. In addition, the pressure replenishment process may also result in insufficient pressure leading to pressure reversal or inability to replenish pressure, and there may also be a contradiction between simultaneous pressure replenishment and pressure relief. Summary of the invention

[0004] In order to solve the above problems, the present invention provides a control method for automatic queuing and pressure replenishment of storage tanks, which can avoid the situation where more than two storage tanks are relieved or replenished at the same time without manual operation, realize smooth control of the pressure relief and pressure replenishment process, effectively reduce the operating intensity and accident risks of operators, and ensure normal production operation.

[0005] The present invention provides a control method for automatic queuing pressure replenishment and pressure relief of storage tanks, wherein each storage tank is connected to a pressure replenishment pipeline, a pressure relief pipeline and a gas phase balance pipeline, wherein the pressure replenishment pipeline includes a high-pressure gas container, a pressure replenishment regulating valve and a pressure replenishment sub-valve correspondingly connected to each of the storage tanks, the pressure relief pipeline includes a gas absorption container, a pressure relief main valve, a pressure relief sub-valve correspondingly connected to each of the storage tanks and a vacuum pump, the gas phase balance pipeline includes a gas phase balance container and a gas phase balance valve correspondingly connected to each of the storage tanks, the pressure replenishment regulating valve, the pressure replenishment sub-valve, the pressure relief sub-valve and the gas phase balance valve are all communicatively connected to a control device, and the control method includes:

[0006] Obtaining the pressure value in each of the storage tanks;

[0007] Compare the pressure value with a preset maximum pressure threshold, and sort the storage tanks whose pressure values ​​are greater than the preset maximum pressure threshold in order of reaching the limit time;

[0008] Determine whether the pressure relief condition is met according to the state of each valve. If it is met, open the main pressure relief valve, and open the vacuum pumps, pressure relief sub-valves and gas phase balance valves corresponding to the storage tanks that have reached the limit in sequence to achieve pressure relief;

[0009] Compare the pressure value with a preset minimum pressure threshold, and sort the storage tanks whose pressure values ​​are less than the preset minimum pressure threshold in order of reaching the limit time;

[0010] Determine whether the pressure replenishment condition is met according to the state of each valve. When the condition is met, open the pressure replenishment regulating valve, and open the pressure replenishment sub-valve corresponding to each storage tank that has reached the limit in sequence to achieve pressure replenishment.

[0011] Preferably, in the above-mentioned control method for automatic queuing pressure replenishment and pressure relief of storage tanks, before comparing the pressure value with the preset maximum pressure threshold, it also includes:

[0012] Obtaining physical parameters of the stored material in the storage tank, physical properties of the storage tank, and external climate conditions;

[0013] The preset maximum pressure threshold is adjusted according to the physical parameter, the physical property of the storage tank and the external climate conditions.

[0014] Preferably, in the above-mentioned control method for automatic queuing pressure replenishment and pressure relief of storage tanks, before comparing the pressure value with the preset minimum pressure threshold, it also includes:

[0015] Obtaining physical parameters of the stored material in the storage tank, physical properties of the storage tank, and external climate conditions;

[0016] The preset minimum pressure threshold is adjusted according to the physical parameter, the physical property of the storage tank and the external climate conditions.

[0017] Preferably, in the above-mentioned control method for automatic queuing pressure replenishment and pressure relief of storage tanks, before obtaining the pressure value in each storage tank, it also includes:

[0018] Obtaining importance data of all the storage tanks;

[0019] Different importance weights are assigned to each storage tank according to the importance data, and pressure replenishment or pressure relief is achieved in descending order of importance.

[0020] Preferably, in the above-mentioned control method for automatic queuing pressure replenishment and pressure relief of storage tanks, determining whether the pressure relief condition is met according to the state of each valve includes:

[0021] Get the status of each valve;

[0022] When all valves on the pressure-compensating pipeline, the gas-phase balancing pipeline, and the pressure-relieving pipeline are in a closed state, it is determined that the pressure-relieving condition is met.

[0023] Preferably, in the above-mentioned control method for automatic queuing pressure replenishment and pressure relief of storage tanks, determining whether the pressure replenishment condition is met according to the state of each valve includes:

[0024] Get the status of each valve;

[0025] When all valves on the pressure-compensating pipeline, the gas-phase balancing pipeline, and the pressure-relieving pipeline are in a closed state, it is determined that the pressure-compensating condition is met.

[0026] Preferably, in the above-mentioned control method for automatic queuing pressure replenishment and pressure relief of storage tanks, after determining whether the pressure relief condition is met according to the state of each valve, it also includes:

[0027] When the pressure relief conditions are not met, an alarm message is issued and the pressure relief operation is stopped.

[0028] Preferably, in the above-mentioned control method for automatic queuing pressure replenishment and pressure relief of storage tanks, after determining whether the pressure replenishment condition is met according to the state of each valve, it also includes:

[0029] When the pressure replenishment conditions are not met, an alarm message is issued and the pressure replenishment operation is stopped.

[0030] Preferably, in the above-mentioned control method for automatic queuing pressure replenishment and pressure relief of storage tanks, after determining whether the pressure relief condition is met according to the state of each valve, it also includes:

[0031] Obtain information on whether the vacuum pump corresponding to the storage tank is successfully started;

[0032] When the vacuum pump corresponding to the storage tank fails to start, an alarm message is issued.

[0033] Preferably, in the above-mentioned control method for automatic queuing pressure replenishment and pressure relief of storage tanks, after determining whether the pressure replenishment condition is met according to the state of each valve, it also includes:

[0034] Obtaining the pressure of the pressure compensation pipeline;

[0035] When the pressure of the pressure-compensating pipeline is lower than the upper limit of the pressure that needs to be supplemented, an alarm message is issued.

[0036] It can be seen from the above description that the control method for automatic queuing pressure replenishment and pressure relief of the above-mentioned storage tanks provided by the present invention includes obtaining the pressure value in each of the storage tanks; comparing the pressure value with the preset maximum pressure threshold, and sorting the storage tanks with pressure values ​​greater than the preset maximum pressure threshold in order of reaching the limit time; determining whether the pressure relief condition is met according to the state of each valve, and when it is met, opening the pressure relief main valve, and opening the vacuum pump and the pressure relief sub-valve and the gas phase balance valve corresponding to the storage tank that has reached the limit in sequence according to the sequence to achieve pressure relief; comparing the pressure value with the preset minimum pressure threshold, and sorting the storage tanks with pressure values ​​less than the preset minimum pressure threshold in order of reaching the limit time; determining whether the pressure replenishment condition is met according to the state of each valve, and when it is met, opening the pressure replenishment regulating valve, and opening the pressure replenishment sub-valve corresponding to each storage tank that has reached the limit in sequence according to the sequence to achieve pressure replenishment, so that it is possible to avoid the situation where more than two storage tanks are relieved or replenished at the same time without manual operation, and realize smooth control of the pressure relief and pressure replenishment process, effectively reduce the operating intensity and accident risks of operators, and ensure normal production operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0038] Figure 1 A schematic diagram of a pipeline for a control method for automatic queuing pressure replenishment and pressure relief of a storage tank provided by the present invention;

[0039] Figure 2 A schematic diagram of the steps of an embodiment of a control method for automatic queuing pressure replenishment and pressure relief of a storage tank provided by the present invention;

[0040] Figure 3 This is the logic diagram of the HF tank pressure replenishment / pressure relief of the R125 device;

[0041] Figure 4 Automatically judge / automatically handle logic diagrams for emergency situations. DETAILED DESCRIPTION

[0042] The core of the present invention is to provide a control method for automatic queuing pressure replenishment and pressure relief of storage tanks, which can avoid the situation where more than two storage tanks are relieved or replenished at the same time without manual operation, realize smooth control of the pressure relief and pressure replenishment process, effectively reduce the operating intensity and accident risks of operators, and ensure normal production operation.

[0043] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0044] The present invention provides a control method for automatically queuing and compensating for pressure and releasing pressure in a storage tank. Figure 1 and Figure 2 As shown, Figure 1 A schematic diagram of a pipeline for a control method for automatic queuing pressure replenishment and pressure relief of a storage tank provided by the present invention, Figure 2 A schematic diagram of the steps of an embodiment of a control method for automatic queuing pressure replenishment and pressure relief of a storage tank provided by the present invention, from Figure 1 It can be seen that the storage tanks A, B, C and D are included, and each storage tank is connected to a pressure-compensating pipeline, a pressure-relieving pipeline and a gas-phase balancing pipeline, wherein the pressure-compensating pipeline includes a high-pressure gas container, a pressure-compensating regulating valve and a pressure-compensating sub-valve connected to each storage tank, and the pressure-relieving pipeline includes a gas absorption container, a pressure-relieving main valve, a pressure-relieving sub-valve connected to each storage tank and a vacuum pump, such as vacuum pump A, vacuum pump B, vacuum pump C and vacuum pump D shown in the figure, and the gas-phase balancing pipeline includes a gas-phase balancing container and a gas-phase balancing valve connected to each storage tank, and the pressure-compensating regulating valve, the pressure-compensating sub-valve, the pressure-relieving sub-valve and the gas-phase balancing valve are all connected to the control device in communication, and in addition, a pressure-compensating main valve may be included. The control method may include the following steps:

[0045] S1: Get the pressure value in each storage tank;

[0046] It should be noted that the storage tank may store HF, H2, CH4, NH3 or SO2, etc., and these gases may be controlled by the method of this embodiment to supplement pressure and release pressure.

[0047] S2: Compare the pressure value with a preset maximum pressure threshold, and sort the storage tanks whose pressure values ​​are greater than the preset maximum pressure threshold in order of reaching the limit time;

[0048] It should be noted that the data acquisition module and the trend viewing module can be used to analyze and organize the historical data of pressure replenishment and pressure relief to obtain a suitable preset maximum pressure threshold. When the pressure value is greater than this value, it proves that pressure relief is required, and the one that reaches the threshold first will be arranged for pressure relief first, and the order of time will be used to decide which storage tank to relieve the pressure first.

[0049] S3: Determine whether the pressure relief condition is met according to the status of each valve. If it is met, open the main pressure relief valve, and open the vacuum pump, pressure relief sub-valve and gas phase balance valve corresponding to the storage tank that has reached the limit in sequence to achieve pressure relief;

[0050] It should be noted that the pressure relief condition includes that no other storage tanks are currently replenishing pressure and no other storage tanks are currently releasing pressure, so as to avoid simultaneous pressure replenishment and pressure release to avoid problems such as pressure reversal and ensure safety during the pressure replenishment process.

[0051] S4: Compare the pressure value with a preset minimum pressure threshold, and sort the storage tanks whose pressure values ​​are less than the preset minimum pressure threshold in order of reaching the limit time;

[0052] The preset minimum pressure threshold can also be obtained by analyzing and collating the historical data of pressure replenishment and pressure relief. When the pressure value is less than this value, it proves that pressure replenishment is needed, and the one that reaches the threshold first will be given priority, and the storage tank to be pressurized first will be decided according to the time order.

[0053] S5: Determine whether the pressure replenishment condition is met according to the status of each valve. If it is met, open the pressure replenishment regulating valve, and open the pressure replenishment sub-valve corresponding to each storage tank that has reached the limit in sequence to achieve pressure replenishment.

[0054] It should be noted that the pressure replenishment condition includes that no other storage tanks are currently releasing pressure and no other storage tanks are replenishing pressure, so as to avoid simultaneous pressure replenishment and pressure relief to avoid problems such as pressure reversal and ensure safety during the pressure relief process.

[0055] It can be seen from the above description that in the embodiment of the control method for automatic queuing pressure replenishment and pressure relief of the above-mentioned storage tanks provided by the present invention, since it includes obtaining the pressure value in each storage tank; comparing the pressure value with the preset maximum pressure threshold, and sorting the storage tanks with pressure values ​​greater than the preset maximum pressure threshold in order of reaching the limit time; determining whether the pressure relief condition is met according to the state of each valve, when it is met, opening the pressure relief main valve, and opening the vacuum pump and the pressure relief sub-valve and the gas phase balance valve corresponding to the storage tank that has reached the limit in sequence according to the sequence to achieve pressure relief; comparing the pressure value with the preset minimum pressure threshold, and sorting the storage tanks with pressure values ​​less than the preset minimum pressure threshold in order of reaching the limit time; determining whether the pressure replenishment condition is met according to the state of each valve, when it is met, opening the pressure replenishment regulating valve, and opening the pressure replenishment sub-valve corresponding to each storage tank that has reached the limit in sequence according to the sequence to achieve pressure replenishment, so that it is possible to avoid the situation where more than two storage tanks are relieved or replenished at the same time without manual operation, and realize smooth control of the pressure relief and pressure replenishment process, effectively reduce the operating intensity and accident risks of operators, and ensure normal production operation.

[0056] In a specific embodiment of the above-mentioned control method for automatic queuing pressure replenishment and pressure relief of storage tanks, before comparing the pressure value with the preset maximum pressure threshold, the following steps may also be included:

[0057] Obtain physical parameters of the storage material in the tank, the physical properties of the tank and external climate conditions;

[0058] The preset pressure maximum threshold is adjusted according to physical parameters, physical properties of the storage tank and external climate conditions.

[0059] In addition, before comparing the pressure value with the preset minimum pressure threshold, the following steps may also be included:

[0060] Obtain physical parameters of the storage material in the tank, the physical properties of the tank and external climate conditions;

[0061] The preset minimum pressure threshold is adjusted according to physical parameters, physical properties of the storage tank and external climate conditions.

[0062] Specifically, we can deeply explore the potential value of historical data. By collecting and analyzing the underlying DCS data for up to one year and based on the relevant physical parameters of the gas in the storage tank (such as boiling point, saturated vapor pressure, etc.), we found that in summer time and winter time, the pressure of the storage tank will change rapidly due to the higher temperature of the gas in summer time, while in winter time, the pressure fluctuation is relatively small due to the relatively low external temperature. In addition, according to the needs of production scheduling or the design service life of the storage tank and the objective physical characteristics of the storage tank (such as corrosion, etc.), it will also affect the corresponding pressure replenishment / pressure relief conditions. Then, based on the consideration of multiple factors such as physical characteristics, external climate and equipment conditions, the initial conditions of pressure replenishment / pressure relief are different. By exploring the adjustment of the opening of the corresponding pressure relief / pressure replenishment regulating valve by operators under different working conditions and weather conditions, the operating experience can be converted into a language program to the maximum extent, achieving a more stable control. For example, if it is winter time, due to the cold outside weather, the gas is not easy to volatilize in winter, and the pressure needs to be supplemented to 0.24Mpa to meet the conditions; if it is summer time, due to the high outside temperature, the gas is easy to volatilize, and the pressure needs to be supplemented to 0.21Mpa to meet the conditions.

[0063] In another specific embodiment of the above-mentioned control method for automatic queuing pressure replenishment and pressure relief of storage tanks, before obtaining the pressure value in each storage tank, the following steps may also be included:

[0064] Get the importance data of all storage tanks;

[0065] Different importance weights are assigned to each storage tank according to the importance data, and pressure replenishment or pressure relief is achieved in descending order of importance.

[0066] It should be noted that when all storage tanks meet the corresponding conditions, the importance may be different due to the different needs of different storage tanks. Therefore, the corresponding importance weight can be added. This weight can be given by workshop technicians and experienced operators. According to the importance, pressure replenishment / pressure relief can be achieved in sequence from high to low, so as to ensure production safety and operation safety to the greatest extent.

[0067] In another specific embodiment of the above-mentioned control method for automatic queuing pressure replenishment and pressure relief of storage tanks, determining whether the pressure relief condition is met according to the state of each valve may specifically include the following steps:

[0068] Get the status of each valve;

[0069] When all valves on the pressure-compensating pipeline, gas-phase balancing pipeline and pressure-relief pipeline are in the closed state, it is determined that the pressure-relief conditions are met.

[0070] It should be noted that in this case, no other storage tank is replenishing pressure, and no other storage tank is releasing pressure. In this case, the safety of the pressure relief process can be better guaranteed.

[0071] In addition, determining whether the pressure replenishment condition is met according to the state of each valve may specifically include the following steps:

[0072] Get the status of each valve;

[0073] When all valves on the pressure replenishment pipeline, gas phase balancing pipeline and pressure relief pipeline are in the closed state, it is determined that the pressure replenishment conditions are met.

[0074] It should be noted that in this case, no other storage tank is releasing pressure, and no other storage tank is replenishing pressure. In this case, the safety of the pressure replenishing process can be better guaranteed.

[0075] In a preferred embodiment of the above-mentioned control method for automatic queuing pressure replenishment and pressure relief of storage tanks, after determining whether the pressure relief condition is met according to the state of each valve, the following steps may also be included:

[0076] When the pressure relief conditions are not met, an alarm message is issued and the pressure relief operation is stopped.

[0077] In addition, after determining whether the pressure replenishment condition is met according to the state of each valve, the following steps may also be included:

[0078] When the pressure replenishment conditions are not met, an alarm message is issued and the pressure replenishment operation is stopped.

[0079] In the above situation, the pressure relief and pressure replenishment can be stopped in time to avoid the situation of simultaneous pressure replenishment and pressure relief, thus ensuring the safety of the production process.

[0080] In another preferred embodiment of the above-mentioned control method for automatic queuing pressure replenishment and pressure relief of storage tanks, after determining whether the pressure relief condition is met according to the state of each valve, the following steps may also be included:

[0081] Obtain information on whether the vacuum pump corresponding to the storage tank is successfully started;

[0082] When the vacuum pump corresponding to the storage tank fails to start, an alarm message is issued.

[0083] In this case, the operator can be notified of the abnormal situation in time, so that the operator can replace or repair the vacuum pump in time to avoid danger and prevent the storage tank from being unable to relieve pressure.

[0084] In another preferred embodiment of the above-mentioned control method for automatic queuing pressure replenishment and pressure relief of storage tanks, after determining whether the pressure replenishment condition is met according to the state of each valve, the following steps may be further included:

[0085] Obtain the pressure of the pressure compensation pipeline;

[0086] When the pressure in the pressure compensation pipeline is lower than the upper limit of the pressure that needs to be compensated, an alarm message is issued.

[0087] In this case, it means that the pressure-replenishing pipeline is unable to provide pressure-replenishing operation to the storage tank. Timely alarm information can enable operators to detect abnormal situations more quickly and deal with them to avoid affecting normal production.

[0088] Taking the HF storage tank as an example, the above control method can be specifically as follows: when the pressures in different HF storage tanks are all too high, they are queued in the order of first reaching the high limit of the pressure setting, and the vacuum pump unit is turned on. The pressure relief is carried out in a queue in a way to ensure that there will not be a process of simultaneous pressure relief in two or more storage tanks, and to ensure that the HF absorption water tank can fully absorb HF. When the pressure in all storage tanks reaches the lower limit of the pressure relief pressure, all valves and pumps are closed to complete the pressure relief process.

[0089] When the pressure of different HF storage tanks is too low, they are queued in the order of first reaching the lower limit of the pressure setting, and the nitrogen pressure-replenishing cut-off valve and other valves are opened. Different HF storage tanks are arranged in accordance with The pressure replenishment is carried out in a queue manner until the pressure in all storage tanks reaches the upper limit of the pressure replenishment pressure, then all valves are closed to complete the pressure replenishment process.

[0090] refer to Figure 3 , Figure 3 This is the logic diagram of the HF tank pressure replenishment / pressure relief of the R125 device. First, remind the internal operators to perform pressure relief / pressure replenishment operations:

[0091] S101: Turn on the pressure relief / pressure replenishment zero manual operation technical program switch;

[0092] Among them, the procedure is divided into pressure relief process and pressure replenishment process, and different procedures are executed for different operations.

[0093] If you choose the pressure relief process:

[0094] S102: The program self-determines whether it is executing the pressure replenishment process. If it is executing the pressure replenishment process, it will wait until the pressure replenishment process is completed before executing the pressure relief program.

[0095] S103: Arrange different storage tanks that meet the pressure relief conditions in order to ensure that there are no two or more storage tanks undergoing pressure relief, thereby ensuring the normal pressure relief process.

[0096] Among them, different storage tanks that meet the conditions refer to storage tanks that reach a given upper pressure limit and need to be adjusted according to different working conditions and production conditions.

[0097] S104: Start the vacuum pump unit, and open the outlet shut-off valve of the vacuum pump unit and the pressure regulating valve of the pressure relief main pipe.

[0098] Among them, due to the characteristics of the vacuum pump unit, there is a situation where the vacuum pump fails to start. If the vacuum pump fails to start, it is necessary to re-select the vacuum pump unit. The opening of the pressure relief main pipe regulating valve is changed according to the acceptability of the pressure relief to ensure that the pressure relief is not too fast or too slow, ensuring the smooth pressure relief and effective treatment of HF.

[0099] S105: Close the gas phase balance valve, nitrogen regulating valve and other valves of the storage tank that needs to be depressurized, and then open the vacuum shut-off valve.

[0100] The purpose of closing valves such as the gas phase balancing valve and the nitrogen regulating valve is to ensure that there will be no pressure relief errors and that pressure replenishment will not be performed.

[0101] S106: When the pressure in the depressurized storage tank is higher than the lower pressure limit, maintain the depressurization state.

[0102] Among them, the lower limit of pressure relief can be adjusted according to different working conditions and production conditions.

[0103] S107: Restore the relevant valves of the storage tank that has completed the current pressure relief to the initial state, and return to S105 to start the pressure relief process for other storage tanks.

[0104] Among them, if all storage tanks reach the lower limit of pressure relief, all valves are restored to their initial state, and the vacuum unit, vacuum unit outlet shut-off valve, pressure relief main pipe regulating valve and other valves are closed, and the pressure relief process is completed.

[0105] If you choose the pressure replenishment process:

[0106] S202: The program self-determines whether it is executing the pressure relief process. If it is executing the pressure relief process, it will wait until the pressure relief process is completed before executing the pressure replenishment program.

[0107] S203: Arrange different storage tanks that meet the pressure replenishment conditions in order to ensure that there are no two or more storage tanks undergoing pressure replenishment, thereby ensuring that the pressure replenishment proceeds normally.

[0108] Among them, different storage tanks that meet the conditions refer to storage tanks that reach a given lower pressure limit and need to be adjusted according to different working conditions and production conditions.

[0109] S204: Close the vacuum shut-off valve, the pressure regulating valve of the pressure relief main pipe and other valves, and open the nitrogen pressure-compensating regulating valve.

[0110] Among them, the opening of the nitrogen pressure replenishment regulating valve is changed according to the acceptability of the pressure replenishment to ensure that the pressure replenishment is not too fast or too slow, thereby ensuring the stability of the pressure replenishment.

[0111] S205: When the pressure in the pressure-compensating storage tank is lower than the pressure-compensating upper limit, the pressure-compensating state is maintained.

[0112] Among them, the upper limit of the pressure supplement can be adjusted according to different working conditions and production conditions.

[0113] S206: Restore the valves of the storage tank that has completed the current pressure replenishment to the initial state, and return to S104 to start the pressure replenishment process for other storage tanks.

[0114] Among them, if all storage tanks reach the upper limit of pressure replenishment, all valves are restored to their initial state and the pressure replenishment process is completed.

[0115] refer to Figure 4 , Figure 4 The figure is a logical diagram of automatic judgment / automatic processing of emergency situations, in which (1) if the pressure relief procedure is executed: 1. If the program self-determines that it is executing the pressure replenishment procedure, a voice alarm pops up, the pressure relief condition is not met, and the program ends automatically; 2. If the set pressure relief condition is not met, a voice alarm pops up, the pressure relief process is not met, and the program ends automatically; 3. If the vacuum pump unit fails to start, a voice alarm pops up, and the vacuum pump unit is reselected to start to ensure the normal operation of the pressure relief. (2) If the pressure replenishment procedure is executed: 1. If the program self-determines that it is executing the pressure relief procedure, a voice alarm pops up, the pressure replenishment condition is not met, and the program ends automatically; 2. Because nitrogen is pressure-replenished by the high-pressure nitrogen tank, if the pressure of the nitrogen main pipe is lower than the high limit of the pressure to be replenished during the pressure replenishment process, a voice alarm pops up and the program ends to ensure that there will be no pressure reversal.

[0116] In summary, the above control method has the following advantages:

[0117] (1) The corresponding zero manual operation procedure can only be run when pressure relief and pressure replenishment are not running at the same time, otherwise it will not continue, ensuring the safety premise that there is only one working condition;

[0118] (2) The upper and lower limits under the pressure relief condition and the upper and lower limits under the pressure replenishment condition can be adjusted according to different production conditions, weather conditions and other factors, and are universal.

[0119] (3) A control method for combined pressure replenishment and pressure relief of storage tanks based on zero manual operation technology for chemical production was established. The pressure relief / pressure replenishment storage tanks that meet the conditions are queued in sequence. As long as the corresponding conditions are met, the pressure relief / pressure replenishment operation can be performed, which effectively reduces the time for manual judgment and the frequency of operation.

[0120] (4) A voice alarm function can be configured. When the pressure relief / pressure replenishment conditions are not met, or when abnormal working conditions make it impossible to meet the pressure replenishment / pressure relief conditions, voice reminders or temporary program execution will be given, which not only ensures the safety of operation, but also reduces the risk of slow manual intervention.

[0121] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A control method for automatic queuing pressure replenishment and pressure relief of storage tanks, characterized in that: Each storage tank is connected to a pressure-compensating pipeline, a pressure-releasing pipeline and a gas-phase balancing pipeline, wherein the pressure-compensating pipeline includes a high-pressure gas container, a pressure-compensating regulating valve and a pressure-compensating sub-valve connected to each storage tank, the pressure-releasing pipeline includes a gas absorption container, a pressure-releasing main valve, a pressure-releasing sub-valve connected to each storage tank and a vacuum pump, the gas-phase balancing pipeline includes a gas-phase balancing container and a gas-phase balancing valve connected to each storage tank, the pressure-compensating regulating valve, the pressure-compensating sub-valve, the pressure-releasing sub-valve and the gas-phase balancing valve are all connected to a control device in a communication manner, and the control method includes: Obtaining the pressure value in each of the storage tanks; Compare the pressure value with a preset maximum pressure threshold, and sort the storage tanks whose pressure values ​​are greater than the preset maximum pressure threshold in order of reaching the limit time; Determine whether the pressure relief condition is met according to the state of each valve. If it is met, open the main pressure relief valve, and open the vacuum pumps, pressure relief sub-valves and gas phase balance valves corresponding to the storage tanks that have reached the limit in sequence to achieve pressure relief; Compare the pressure value with a preset minimum pressure threshold, and sort the storage tanks whose pressure values ​​are less than the preset minimum pressure threshold in order of reaching the limit time; Determine whether the pressure replenishment condition is met according to the state of each valve. If the condition is met, open the pressure replenishment regulating valve, and open the pressure replenishment sub-valve corresponding to each storage tank that has reached the limit in sequence to achieve pressure replenishment; Determining whether the pressure relief condition is met according to the state of each valve includes: Get the status of each valve; When all valves on the pressure-compensating pipeline, the gas-phase balancing pipeline, and the pressure-relieving pipeline are in a closed state, it is determined that the pressure-relieving condition is met; Determining whether the pressure replenishment condition is met according to the state of each valve includes: Get the status of each valve; When all valves on the pressure-compensating pipeline, the gas-phase balancing pipeline, and the pressure-relieving pipeline are in a closed state, it is determined that the pressure-compensating condition is met.

2. The control method for automatic queuing pressure replenishment and pressure relief of storage tanks according to claim 1 is characterized in that: Before comparing the pressure value with the preset maximum pressure threshold, the method further includes: Obtaining physical parameters of the stored material in the storage tank, physical properties of the storage tank, and external climate conditions; The preset maximum pressure threshold is adjusted according to the physical parameter, the physical property of the storage tank and the external climate conditions.

3. The control method for automatic queuing pressure replenishment and pressure relief of storage tanks according to claim 1 is characterized in that: Before comparing the pressure value with the preset minimum pressure threshold, the method further includes: Obtaining physical parameters of the stored material in the storage tank, physical properties of the storage tank, and external climate conditions; The preset minimum pressure threshold is adjusted according to the physical parameter, the physical property of the storage tank and the external climate conditions.

4. The control method for automatic queuing pressure replenishment and pressure relief of storage tanks according to claim 1 is characterized in that: After determining whether the pressure relief condition is met according to the state of each valve, the method further includes: When the pressure relief conditions are not met, an alarm message is issued and the pressure relief operation is stopped.

5. The control method for automatic queuing pressure replenishment and pressure relief of storage tanks according to claim 1 is characterized in that: After determining whether the pressure replenishment condition is met according to the state of each valve, the method further includes: When the pressure replenishment conditions are not met, an alarm message is issued and the pressure replenishment operation is stopped.

6. The control method for automatic queuing pressure replenishment and pressure relief of storage tanks according to claim 4 is characterized in that: After determining whether the pressure relief condition is met according to the state of each valve, the method further includes: Obtain information on whether the vacuum pump corresponding to the storage tank is successfully started; When the vacuum pump corresponding to the storage tank fails to start, an alarm message is issued.

7. The control method for automatic queuing pressure replenishment and pressure relief of storage tanks according to claim 5 is characterized in that: After determining whether the pressure replenishment condition is met according to the state of each valve, the method further includes: Obtaining the pressure of the pressure compensation pipeline; When the pressure of the pressure-compensating pipeline is lower than the upper limit of the pressure that needs to be supplemented, an alarm message is issued.

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