Pressure control device, method and system for coexistence of different types of full containment tanks

Abstract

This invention discloses a pressure control device, method, and system for the coexistence of different types of full-containment tanks. It includes: multiple full-containment tanks, each equipped with a first pressure sensor, and each full-containment tank connected to an input pipe via a valve group; each full-containment tank is connected to a flare and an output pipe, with a first control valve between the flare and the full-containment tank; the first control valve and valve group of each full-containment tank are respectively connected to a controller, which controls the opening and closing of the first control valve and valve group; two full-containment tanks with different design pressures share a single output pipe, and a pressure protection system is installed on the output pipe between the two full-containment tanks. The pressure protection system includes at least one first shut-off valve and a second pressure sensor connected to the controller; in response to a trigger signal from the second pressure sensor, the controller controls the opening and closing of the first shut-off valve. This allows for the simultaneous operation of full-containment tanks with different design pressures while ensuring the safe and stable operation of the station.

Description

Technical Field

[0001] This invention relates to the field of liquefied natural gas full-containment tank technology, and in particular to a pressure control device, method and system for coexisting different types of full-containment tanks. Background Technology

[0002] LNG (liquefied natural gas) is a widely used high-quality energy source. Due to its high calorific value, high efficiency, and low pollution, LNG is widely used in various sectors of the national economy and people's livelihood, and its share of energy consumption is gradually increasing. As the most important storage equipment in LNG receiving terminals and liquefaction plants, LNG full-containment tanks undertake functions such as receiving and unloading ships, low-pressure external transportation, and loading and unloading trucks. They are characterized by high cost, long construction period, and complex control. Pressure control of LNG full-containment tanks is also a key and challenging aspect of their control systems.

[0003] Currently, the commonly used large LNG full-containment tank types are bimetallic wall full-containment LNG tanks and prestressed concrete full-containment LNG tanks. Most domestic LNG receiving terminals use the same type of LNG full-containment tank, with identical design and operating pressures, facilitating control of the tanks and overall terminal operation management. With the development of the LNG industry, owners have increasingly demanded diverse types of LNG full-containment tanks. Bimetallic full-containment tanks, with their advantages of short construction cycles and low investment, have become one of the preferred tank types in the domestic engineering construction industry. For renovation and expansion projects, the simultaneous use of bimetallic wall and prestressed concrete LNG full-containment tanks in the same LNG receiving terminal has become a reality. The operating and design pressures of bimetallic full-containment tanks are relatively low (typically 18–21 kPaG), resulting in a lower design pressure than prestressed concrete full-containment tanks (typically 23–29 kPaG). Therefore, the simultaneous operation of two different types of LNG full-containment tanks can pose safety hazards to the bimetallic full-containment tank with its lower design pressure. Therefore, from the perspective of design safety principles, existing technologies require two independent BOG (evaporation gas) pipelines, BOG compressors, flare systems, and make-up gas pipelines for bimetallic full-containment tanks and prestressed concrete full-containment tanks. This greatly increases the construction cost of LNG receiving terminals and also adds difficulty and safety hazards to the operation and management of the terminals.

[0004] Therefore, there is an urgent need for a control device, method, and system that allows two different LNG full-containment tanks to operate simultaneously. Summary of the Invention

[0005] This invention provides a pressure control device, method, and system for the coexistence of different types of full-containment tanks, which solves the technical problem in the prior art where full-containment tanks with different design pressures, when connected and operated simultaneously, pose a safety hazard to bimetallic full-containment tanks with lower design pressures. It achieves the technical effect of allowing full-containment tanks with different design pressures to operate simultaneously while ensuring the safe and stable operation of the station.

[0006] To solve the above-mentioned technical problems, the present invention provides the following technical solution:

[0007] In a first aspect, the present invention discloses a pressure control device for the coexistence of different types of full-containment tanks, comprising:

[0008] Multiple full-containment tanks, each of which is equipped with a first pressure detector to detect the pressure inside the full-containment tank;

[0009] Each of the above-mentioned full-containment tanks is connected to an input pipe via a valve assembly, which is used to control the gas input into the full-containment tank.

[0010] Each of the aforementioned full-containment tanks is connected to a flare and an output pipe, and a first control valve is provided between the flare and the full-containment tank; the first control valve and the valve group of each of the aforementioned full-containment tanks are respectively connected to a controller, and the controller controls the opening and closing of the first control valve and the valve group in response to the trigger signal of the corresponding first pressure detector.

[0011] Two full-containment tanks with different design pressures share a single output pipe. A pressure protection system is provided on the output pipe located between the two full-containment tanks. The pressure protection system includes at least one first shut-off valve and a second pressure detector connected to a controller. In response to a trigger signal from the second pressure detector, the controller controls the opening and closing of the first shut-off valve.

[0012] Optionally, the pressure protection system includes multiple second pressure detectors installed at multiple locations on the output pipe; the controller responds to a preset number of trigger signals from the second pressure detectors to control the opening and closing of multiple first shut-off valves.

[0013] Optionally, the above device further includes a third pressure detector installed on the output pipe and a second control valve connected in series with the first shut-off valve; the third pressure detector and the second control valve are respectively connected to the controller, and the controller controls the opening and closing degree of the second control valve according to the value of the third pressure detector.

[0014] Optionally, the valve assembly includes a third control valve and a second shut-off valve connected in series, wherein the third control valve is connected to the controller.

[0015] Optionally, a third shut-off valve may be provided on the output and / or input pipes of any of the aforementioned full-containment tanks.

[0016] Optionally, among the two full-containment tanks with different design pressures, the one with the lowest design pressure is positioned closest to the output end of the output tube.

[0017] Secondly, the present invention discloses a pressure control method for the coexistence of different types of full-containment tanks, comprising: a pressure control device for the coexistence of different types of full-containment tanks.

[0018] The above methods include:

[0019] Two preset negative pressure and overpressure settings for full-capacity tanks with different design pressures are provided; the first overpressure setting of the full-capacity tank closest to the output end of the aforementioned output pipe is less than the second overpressure setting of the other full-capacity tank.

[0020] When all full-capacity tanks are operating normally, close all the aforementioned first control valves and valve groups, and open the remaining valves;

[0021] When any of the above-mentioned full-capacity tanks reaches the preset negative pressure replenishment setting value, in response to the signal triggered by the corresponding first pressure detector, the corresponding valve group is controlled to open and replenishment is performed;

[0022] When the pressure in the output pipe is greater than the first overpressure setting value, the first shut-off valve is controlled to close in response to the trigger signal of the second pressure detector; the pressure in the two full-containment tanks with different design pressures is detected, and when the pressure value detected in either of the full-containment tanks is greater than the corresponding overpressure setting value, the corresponding first control valve is opened to discharge the gas to the flare.

[0023] Optionally, the steps for controlling the closure of the first shut-off valve described above specifically include:

[0024] In a plurality of the aforementioned second pressure detectors, when a preset number of the aforementioned second pressure detectors detect that the pressure in the aforementioned output pipe is greater than the first overpressure setting value, the aforementioned first shut-off valve is controlled to close.

[0025] Optionally, the method includes a third pressure sensor mounted on the output pipe and a second control valve connected in series with the first shut-off valve; the method further includes:

[0026] The above-mentioned output tube pressure stability value is preset;

[0027] Based on the real-time monitoring of the pressure on the output pipe by the third pressure detector, the opening and closing degree of the second control valve is adjusted to maintain the pressure in the output pipe at the aforementioned stable value.

[0028] Thirdly, this invention discloses a pressure control system for the coexistence of different types of full-containment tanks, comprising:

[0029] The pressure threshold definition module is used to preset the negative pressure replenishment setting value and the overpressure setting value of two full-containment tanks with different design pressures; wherein, the first overpressure setting value of the full-containment tank closest to the output end of the above-mentioned output pipe is less than the second overpressure setting value of the other full-containment tank;

[0030] The normal operation control module is used to close all the above-mentioned first control valves and valve groups, and open the remaining valves when all full-capacity tanks are operating normally.

[0031] The gas replenishment control module is used to control the corresponding valve group to open and replenish gas in response to the signal triggered by the corresponding first pressure detector when any of the above-mentioned full-capacity tanks reaches the preset negative pressure gas replenishment setting value.

[0032] The overpressure control module is used to control the first shut-off valve to close in response to the trigger signal of the second pressure detector when the pressure of the output pipe is greater than the first overpressure setting value; it detects the pressure in the two full-containment tanks with different design pressures, and when the pressure value detected in either of the full-containment tanks is greater than the corresponding overpressure setting value, it opens the corresponding first control valve to discharge the gas to the flare.

[0033] One or more technical solutions provided in this invention have at least the following technical effects or advantages:

[0034] The technical solution of this invention involves installing pressure gauges on two full-containment tanks to monitor their internal pressure, and installing valves on the input pipes of the two tanks with different design pressures to control the injection volume based on the monitored internal pressure. The two full-containment tanks with different design pressures share a single output pipe, and a pressure protection system is installed between them. During injection, the pressure protection system opens the valves to maintain communication between the two tanks, improving injection efficiency. When the pressure gauges detect overpressure in one tank, the pressure protection system closes the valves to isolate the two tanks with different design pressures. This allows both tanks to operate simultaneously, maintaining their pressure within a reasonable range under normal conditions and preventing safety hazards to the lower-pressure bimetallic full-containment tank when two tanks with different design pressures are operating simultaneously. Attached Figure Description

[0035] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0036] Figure 1 A schematic diagram of a pressure control device for coexistence of different types of full-containment tanks provided by the present invention;

[0037] Figure 2 A flowchart of a pressure control method for the coexistence of different types of full-containment tanks provided by the present invention;

[0038] Figure 3This is a schematic diagram of a pressure control system for the coexistence of different types of full-containment tanks provided by the present invention. Detailed Implementation

[0039] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0040] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0041] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0042] In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set" and "connection" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances. Furthermore, the terms "first," "second," "third," etc., are used only for distinguishing descriptions and should not be construed as indicating or implying relative importance.

[0043] It should be understood that the embodiments of the present invention and the specific features in the embodiments are detailed descriptions of the technical solutions of this application, rather than limitations on the technical solutions of this application. Unless otherwise specified, the embodiments of the present application and the technical features in the embodiments can be combined with each other.

[0044] In this embodiment of the invention, the following are provided: Figure 1 The pressure control device shown includes a coexistence of different types of full-containment tanks, comprising:

[0045] Multiple full-containment tanks, each equipped with a first pressure sensor to detect the pressure inside the full-containment tank. (Reference) Figure 1The system includes a full-containment tank T01, a first pressure sensor P1, a full-containment tank T02, and a first pressure sensor P2. The first pressure sensor is designed to monitor the pressure inside the full-containment tank so that the valves can be controlled accordingly.

[0046] Each full-containment tank is connected to the inlet pipe via a valve assembly, which controls the gas input into the full-containment tank. (Reference) Figure 1 The system includes shut-off valve XV04 and control valves PCV02 and PCV03, respectively. Each full-containment tank has one shut-off valve and one control valve connected in series for better fluid control and safety protection. Specifically, the shut-off valve is designed to cut off the flow of the medium in the pipeline. When it is necessary to stop fluid transmission, the shut-off valve can close quickly to avoid accidents and ensure the safety of personnel and equipment. The control valve is designed to control the flow rate and pressure of the medium in the pipeline. By adjusting the opening of the control valve, precise control of the medium flow rate can be achieved to meet different operating conditions. Two valves are installed: a control valve and a shut-off valve. The control valve is used for control of the DCS system, and the shut-off valve is used for safety interlocking of the SIS system. Furthermore, the two valves allow for the use of the other valve for control in case one fails, improving safety.

[0047] Each full-containment tank is connected to a flare and an output pipe, with a first control valve between the flare and the full-containment tank. The first control valve and valve group of each full-containment tank are connected to a controller, which responds to the trigger signal from the corresponding first pressure detector to control the opening and closing of the first control valve and valve group. The connection between the full-containment tank and the flare is to release excess vapors exceeding the full-containment tank's capacity, safely burning this excess vapors with the flare to reduce the pressure inside the tank and prevent excessive pressure from causing tank damage, resulting in significant economic losses and safety hazards. The connection between the full-containment tank and the output pipe (i.e., the BOG main pipe) delivers the vapors to the equipment in use, such as to a recondenser for recycling or to a fuel gas system for combustion. Please refer to [reference needed for details on the first control valve between the flare and the full-containment tank]. Figure 1 Control valves PCV05 and PCV04 are designed to prevent the evaporator from directly entering the flare, thus avoiding waste, when there is no overpressure within the full-capacity tank. A controller is used to automatically monitor the pressure within the entire container, opening the valve assembly (e.g., ...) when negative pressure is detected. Figure 1 In the case of overpressure (PCV02 and XV04, XV03 and PCV03), the first control valve is opened.

[0048] Two full-containment tanks with different design pressures share a single output pipe. A pressure protection system is installed on the output pipe located between the two full-containment tanks. The pressure protection system includes at least one first shut-off valve and a second pressure detector connected to the controller. In response to the trigger signal of the second pressure detector, the controller controls the opening and closing of the first shut-off valve.

[0049] Among them, the two full-containment tanks with different design pressures can be bimetallic full-containment tanks and prestressed concrete full-containment tanks. The operating pressure and design pressure of the bimetallic full-containment tank are 18-21 kPaG, and the design pressure of the prestressed concrete full-containment tank is 23-29 kPaG. The two full-containment tanks with different design pressures share a single output pipe (i.e., the BOG main pipe, such as...). Figure 1 (As shown). To prevent safety hazards from the lower-pressure tank when two full-containment tanks with different design pressures operate simultaneously, a pressure protection system is installed on the output pipe between the two full-containment tanks. This system detects the pressure in the output pipe using second pressure sensors P6, P7, and P8. When the pressure exceeds the limit, the first shut-off valves XV05 and XV06 completely cut off the BOG main pipe, isolating the two full-containment tanks to protect the lower-pressure tank.

[0050] Furthermore, the pressure protection system includes multiple second pressure detectors installed at multiple locations on the output pipe; the controller responds to a preset number of trigger signals from the second pressure detectors to control the opening and closing of multiple first shut-off valves.

[0051] It should be noted that multiple second pressure gauges (P6, P7, and P8) are installed to provide more comprehensive pressure monitoring and control. These second pressure gauges are distributed at different locations within the pipeline to more accurately measure pressure changes inside the pipeline. The controller monitors the three second pressure gauges (P6, P7, and P8), and if any two reach a threshold, multiple first shut-off valves can be controlled to close, shutting off both full-containment tanks. This avoids system malfunctions caused by a single second pressure gauge failure or false alarm. Furthermore, the multiple first shut-off valves (XV05 and XV06) provide mutual backup, improving system reliability. If one valve fails or becomes stuck, another valve can still operate normally, ensuring pipeline closure and fluid control.

[0052] Furthermore, the device also includes a third pressure sensor P5 mounted on the output pipe, and a second control valve PCV01 connected in series with the first shut-off valve; the third pressure sensor and the second control valve are respectively connected to a controller, which controls the opening and closing degree of the second control valve based on the value of the third pressure sensor. Taking the bimetallic full-containment tank T02 and the prestressed concrete full-containment tank T01 as examples, such as... Figure 1As shown, the pressure in the output pipe is detected by the third pressure detector P5. When the pressure in the output pipe gradually reaches the pressure threshold of the bimetallic full-containment tank T02 from the lowest value, the second control valve PCV01 is controlled by the controller to gradually reduce the supply of prestressed concrete full-containment tank T01 to bimetallic full-containment tank T02. This is to avoid the inability to control the pressure in time when bimetallic full-containment tank T02 is about to overpressure, thus ensuring the safe and stable operation of bimetallic full-containment tank T02 and improving safety.

[0053] Furthermore, the valve assembly includes a third control valve and a second shut-off valve connected in series, with the third control valve connected to the controller.

[0054] It should be noted that the reason for connecting a shut-off valve and a control valve in series on the pipeline is to achieve better fluid control and safety protection. Figure 1 Both full-containment tanks have a valve assembly on their inlet branch pipes. The prestressed concrete full-containment tank T01 is controlled by the third control valve PCV02 and the second shut-off valve XV04, while the bimetallic full-containment tank T02 is controlled by the third control valve PCV03 and the second shut-off valve XV03. The shut-off valve's primary function is to cut off the flow of the medium in the pipeline. When it is necessary to stop fluid transmission, the shut-off valve can close quickly to avoid accidents and ensure the safety of personnel and equipment. The control valve controls the flow rate and pressure of the medium in the pipeline. By adjusting the opening of the control valve, precise control of the medium flow rate can be achieved to meet different operating conditions. By connecting the shut-off valve and the control valve in series, better fluid control and safety protection can be achieved.

[0055] Furthermore, a third shut-off valve is provided on the output and / or input pipes of any full-containment tank. Figure 1 In this system, the output and / or input pipelines of the prestressed concrete full-containment tank T01 are controlled by a third shut-off valve XV01, and the output and / or input pipelines of the bimetallic full-containment tank T02 are controlled by a third shut-off valve XV02. This is intended to control the evaporation gas within the full-containment tanks. When evaporation gas is needed for the equipment, the corresponding third shut-off valve is opened to release the evaporation gas. When evaporation gas is not needed, the corresponding third shut-off valve is closed.

[0056] Furthermore, among the two full-containment tanks with different design pressures, the full-containment tank with the lowest design pressure is positioned closest to the output end of the output pipe.

[0057] It should be noted that because fluids flow towards the outlet during pipeline operation, the full-capacity tank located at the output end of the outlet pipe will fill up first, making its pressure the easiest to monitor. Since the two full-capacity tanks are connected, filling the tank with the higher design pressure first could easily lead to safety hazards. Therefore, the full-capacity tank with the lowest design pressure is positioned closest to the output end of the outlet pipe.

[0058] In embodiments of the present invention, pressure gauges are installed on two full-containment tanks to monitor their internal pressure, and valves are installed on the inlet pipes of the two full-containment tanks with different design pressures. The injection volume is controlled based on the monitored pressure within the full-containment tanks. The two full-containment tanks with different design pressures share a single outlet pipe, and a pressure protection system is installed between them. During injection, the pressure protection system opens the valves to maintain communication between the two full-containment tanks, improving injection efficiency. When the pressure gauges detect overpressure in one full-containment tank, the pressure protection system closes the valves to isolate the two full-containment tanks with different design pressures. This allows both full-containment tanks to operate simultaneously, maintaining their pressures within a reasonable range under normal conditions. This avoids safety hazards to the bimetallic full-containment tank with the lower design pressure when two full-containment tanks with different design pressures are operating simultaneously, thus improving safety.

[0059] In this embodiment of the invention, the following are provided: Figure 2 The method shown is a pressure control method for the coexistence of different types of full-containment tanks, which includes steps S101 to S102:

[0060] Step S101: Preset negative pressure replenishment setting value and overpressure setting value for two full-containment tanks with different design pressures; wherein, the first overpressure setting value of the full-containment tank closest to the output end of the output pipe is less than the second overpressure setting value of the other full-containment tank.

[0061] It should be noted that the two full-capacity tanks with different design pressures operate under two conditions: first, the full-capacity tank experiences negative pressure due to excessive evaporation gas being drawn from it by the external compressor; second, the full-capacity tank experiences overpressure due to insufficient BOG evaporation gas compressor capacity or excessive evaporation gas volume caused by overheating. Therefore, preset gas replenishment and overpressure settings are established for the two full-capacity tanks with different design pressures.

[0062] Step S1021: When all full-containment tanks are operating normally, close all first control valves and valve groups, and open the remaining valves. Normal operation of the full-containment tanks indicates that fluid is being released from the tanks and no replenishment is needed; therefore, valve groups PCV02 and XV04, and valve groups PCV03 and XV03 are closed. Since combustion using a flare is also unnecessary, first control valves PCV04 and PCV05 are closed.

[0063] Step S1022: When any full-capacity tank reaches the preset negative pressure replenishment setting value, in response to the signal triggered by the corresponding first pressure detector, the corresponding valve group is controlled to open and replenish air. This step mainly utilizes the first pressure detector to detect the pressure inside the full-capacity tank to assess whether the fluid volume is low, thereby controlling valve groups PCV02 and XV04 (or valve groups PCV03 and XV03) to replenish the corresponding full-capacity tank. Specifically, the negative pressure replenishment setting value for full-capacity tank T01 is A01, and the negative pressure replenishment setting value for full-capacity tank T02 is A02. A01 and A02 can be the same or different. When P1 detects that the gas pressure inside the full-capacity tank meets A01, valve group XV04 and PCV02 are opened, and the status of the other valves remains unchanged; when P2 detects that the gas pressure inside the full-capacity tank meets A02, valve group XV03 and PCV03 are opened, and the status of the other valves remains unchanged; when both P1 and P2 reach their respective set values, valves XV04, PCV02, XV03 and PCV02 are opened, and the status of the other valves remains unchanged.

[0064] Step S1023: When the pressure in the output pipe is greater than the first overpressure setting value, the first shut-off valve is controlled to close in response to the trigger signal of the second pressure detector; the pressure in the two full-containment tanks with different design pressures is detected. When the pressure value detected in either full-containment tank is greater than the corresponding overpressure setting value, the corresponding first control valve is opened to discharge the gas to the flare.

[0065] It should be noted that if the BOG evaporative gas compressor's extraction capacity is insufficient, or if the evaporative gas in the full-containment tank becomes excessive due to overheating, causing overpressure in the full-containment tank, the two full-containment tanks need to be isolated, and the overpressurized evaporative gas should be transferred to the flare. Specifically, assuming the overpressure setting value of full-containment tank T01 is A03, the overpressure setting value of full-containment tank T02 is A04, and the setting values ​​of the second pressure detectors P6, P7, and P8 are A04, where A04 < A03. When two of the detectors P6, P7, and P8 detect that the gas pressure in the output pipe reaches the set value A04, the first shut-off valves XV05 and XV06 close; when the first pressure detector P2 detects that the gas pressure in the full-capacity tank meets A04, the first control valve PCV04 opens, discharging the overpressurized vaporized gas in the full-capacity tank T02 to the flare; when the first pressure detector P1 detects that the gas pressure in the full-capacity tank meets A03, the first control valve PCV05 opens, discharging the overpressurized vaporized gas in the full-capacity tank T01 to the flare.

[0066] Furthermore, the step of controlling the closure of the first shut-off valve specifically includes: among multiple second pressure detectors, when a preset number of second pressure detectors detect that the pressure in the output pipe exceeds a first overpressure setting value, controlling the closure of the first shut-off valve. The reason for setting multiple second pressure detectors P6, P7, and P8 is to provide more comprehensive pressure monitoring and control. Setting two of them to reach a threshold allows control to close the first shut-off valves XV05 and XV06, shutting off both full-containment tanks. This avoids system malfunctions caused by a single second pressure detector failure or false alarm.

[0067] Furthermore, the method includes a third pressure sensor installed on the output pipe and a second control valve connected in series with the first shut-off valve; the method also includes: preset a stable pressure value for the output pipe; and adjusting the opening and closing degree of the second control valve according to the pressure on the output pipe monitored in real time by the third pressure sensor, so as to maintain the pressure in the output pipe at a stable value.

[0068] It should be noted that in the output tube (i.e. Figure 1 During the control process of the main BOG pipe, the opening and closing degree of the second control valve PCV01 is mainly controlled to control the fluid delivered from the full-capacity tank T01 to the output pipe. Under the monitoring of the third pressure detector P5, when the pressure in the output pipe is about to reach the pressure stability value, the pressure delivery is gradually reduced to avoid sudden disconnection and impact, thus improving safety.

[0069] Based on the same inventive concept, embodiments of the present invention provide a pressure control system for the coexistence of different types of full-containment tanks, such as... Figure 3 As shown, it includes:

[0070] The pressure threshold definition module is used to preset the negative pressure replenishment setting value and the overpressure setting value of two full-capacity tanks with different design pressures; wherein, the first overpressure setting value of the full-capacity tank closest to the output end of the output pipe is less than the second overpressure setting value of the other full-capacity tank;

[0071] The normal operation control module is used to close all first control valves and valve groups and open the remaining valves when all full-capacity tanks are operating normally.

[0072] The gas replenishment control module is used to control the corresponding valve group to open and replenish gas when any full-capacity tank reaches the preset negative pressure gas replenishment setting value, in response to the signal triggered by the corresponding first pressure detector.

[0073] The overpressure control module is used to control the first shut-off valve to close in response to the trigger signal of the second pressure detector when the pressure in the output pipe is greater than the first overpressure setting value; it detects the pressure in two full-containment tanks with different design pressures, and when the pressure value detected in either full-containment tank is greater than the corresponding overpressure setting value, it opens the corresponding first control valve to discharge the gas to the flare.

[0074] This invention is described with reference to flowchart illustrations and / or block diagrams of methods and systems according to embodiments of the invention. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, generate instructions for implementing the flowchart... Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0075] Although preferred embodiments of the invention have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including both the preferred embodiments and all changes and modifications falling within the scope of the invention.

[0076] Obviously, those skilled in the art can make various modifications and variations to this invention without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this invention and their equivalents, this invention also intends to include these modifications and variations.

Claims

1. A pressure control device for the coexistence of different types of full-containment tanks, characterized in that, The device includes: Multiple full-containment tanks, each of which is equipped with a first pressure detector to detect the pressure inside the full-containment tank; Any of the aforementioned full-containment tanks is connected to an input pipe via a valve assembly, the valve assembly being used to control the gas input into the full-containment tank; Each of the full-containment tanks is connected to a flare and an output pipe, and a first control valve is provided between the flare and the full-containment tank; the first control valve and the valve group of each of the full-containment tanks are respectively connected to a controller, and the controller controls the opening and closing of the first control valve and the valve group in response to the trigger signal of the corresponding first pressure detector; Two full-containment tanks with different design pressures share a single output pipe. A pressure protection system is provided on the output pipe located between the two full-containment tanks. The pressure protection system includes at least one first shut-off valve and a second pressure detector connected to a controller. In response to a trigger signal from the second pressure detector, the controller controls the opening and closing of the first shut-off valve. Wherein, the controller controlling the opening and closing of the first shut-off valve in response to the trigger signal of the second pressure detector includes: When the pressure of the output pipe is greater than the first overpressure setting value, the first shut-off valve is controlled to close in response to the trigger signal of the second pressure detector. The first overpressure setting value is the overpressure setting value of the full-containment tank closest to the output end of the output pipe among the two full-containment tanks with different design pressures. The first overpressure setting value is less than the second overpressure setting value of the other full-containment tank among the two full-containment tanks with different design pressures.

2. The apparatus as claimed in claim 1, characterized in that, The pressure protection system includes multiple second pressure detectors installed at multiple locations on the output pipe; the controller responds to a preset number of trigger signals from the second pressure detectors to control the opening and closing of multiple first shut-off valves.

3. The apparatus as described in claim 2, characterized in that, The device further includes a third pressure sensor mounted on the output pipe and a second control valve connected in series with the first shut-off valve; the third pressure sensor and the second control valve are respectively connected to the controller, and the controller controls the opening and closing degree of the second control valve according to the value of the third pressure sensor.

4. The apparatus as claimed in claim 1, characterized in that, The valve assembly includes a third control valve and a second shut-off valve connected in series, with the third control valve connected to the controller.

5. The apparatus as claimed in claim 1, characterized in that, A third shut-off valve is provided on the output and / or input pipes of any of the aforementioned full-containment tanks.

6. The apparatus according to any one of claims 1 to 5, characterized in that, Of the two full-containment tanks with different design pressures, the one with the lowest design pressure is positioned closest to the output end of the output tube.

7. A pressure control method for the coexistence of different types of full-containment tanks, characterized in that, Includes the apparatus as described in any one of claims 1 to 6; The method includes: Two preset negative pressure and overpressure settings are used for two full-containment tanks with different design pressures; wherein, the first overpressure setting of the full-containment tank closest to the output end of the output pipe is less than the second overpressure setting of the other full-containment tank. When all full-containment tanks are operating normally, close all the first control valves and the valve group, and open the remaining valves; When any of the full-capacity tanks reaches the preset negative pressure replenishment setting value, in response to the signal triggered by the corresponding first pressure detector, the corresponding valve group is controlled to open and replenishment is performed; When the pressure in the output pipe is greater than the first overpressure setting value, the first shut-off valve is controlled to close in response to the trigger signal of the second pressure detector; the pressure in the two full-containment tanks with different design pressures is detected, and when the pressure value detected in either full-containment tank is greater than the corresponding overpressure setting value, the corresponding first control valve is opened to discharge the gas to the flare.

8. The method as described in claim 7, characterized in that, The step of controlling the first shut-off valve to close specifically includes: In a plurality of second pressure detectors, when a preset number of second pressure detectors detect that the pressure in the output pipe is greater than the first overpressure setting value, the first shut-off valve is controlled to close.

9. The method as described in any one of claims 7 or 8, characterized in that, This includes a third pressure sensor mounted on the output pipe and a second control valve connected in series with the first shut-off valve; The method further includes: The preset output tube pressure stability value; Based on the real-time monitoring of the pressure on the output pipe by the third pressure detector, the opening and closing degree of the second control valve is adjusted to maintain the pressure in the output pipe at the stable value.

10. A pressure control system for the coexistence of different types of full-containment tanks, characterized in that, Includes the apparatus as described in any one of claims 1 to 6; The system includes: The pressure threshold definition module is used to preset the negative pressure replenishment setting value and the overpressure setting value of two full-containment tanks with different design pressures; wherein, the first overpressure setting value of the full-containment tank closest to the output end of the output pipe is less than the second overpressure setting value of the other full-containment tank; The normal operation control module is used to close all the first control valves and the valve group when all full-capacity tanks are operating normally, and to open the remaining valves; The gas replenishment control module is used to control the corresponding valve group to open and replenish gas in response to the signal triggered by the corresponding first pressure detector when any of the full-capacity tanks reaches the preset negative pressure gas replenishment setting value. The overpressure control module is used to control the first shut-off valve to close in response to the trigger signal of the second pressure detector when the pressure of the output pipe is greater than the first overpressure setting value; detect the pressure in the two full-containment tanks with different design pressures, and when the pressure value detected in either full-containment tank is greater than the corresponding overpressure setting value, open the corresponding first control valve to discharge the gas to the flare.

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