Low temperature liquid atmospheric tank sandwich seal gas device

Abstract

The utility model discloses a kind of low-temperature liquid normal-pressure storage tank interlayer sealing gas devices, it is related to liquid storage device technical field, including liquid nitrogen storage tank, the liquid nitrogen storage tank is jointly composed by shell, inner container and interlayer, the shell is as the outermost layer of liquid nitrogen storage tank, the inside of shell is provided with inner container, interlayer is arranged between the shell and inner container, the lower left side of shell is fixedly connected with circulating pipeline, the front section of circulating pipeline is connected with self booster, the rear section of circulating pipeline is connected with self booster regulating valve.The low-temperature liquid normal-pressure storage tank interlayer sealing gas device, compared with the existing ordinary low-temperature liquid normal-pressure storage tank interlayer sealing gas device, in the steady state, without device overall pressure increasing, only using circulating cooperation self booster supplemental pressure, greatly reduce device energy consumption, in the pressure loss state, can immediately make pressure compensation measure, avoid interlayer pressure loss, lead to shell to appear collapse deformation under external pressure.

Description

Technical Field

[0001] This utility model relates to the field of liquid storage device technology, specifically to a sealing gas device for the jacket of a cryogenic liquid atmospheric pressure storage tank. Background Technology

[0002] According to the current air separation design, the liquid nitrogen storage tank is an atmospheric pressure tank. The interlayer of the tank is filled with perlite insulation material. In order to ensure that the interlayer space is dry while maintaining a slight positive pressure, the design requires the introduction of dry nitrogen gas as a sealing gas. The sealing gas for the storage tank comes from a low-pressure nitrogen pipeline network.

[0003] The existing sealing gas device for the interlayer of cryogenic liquid atmospheric pressure storage tanks operates as part of the air separation unit and does not have a pressure stabilization and circulation system. This means that in order to ensure the pressure of the unit, it needs to continuously operate to replenish the pressure and stabilize the pressure of the liquid nitrogen storage tank. This method, which is only used for pressure stabilization, is extremely energy-intensive and will cause a lot of unnecessary energy waste. Furthermore, if the sealing gas of the interlayer insulation material is interrupted at cryogenic temperatures, the gas volume in the interlayer space will decrease, that is, the interlayer of the liquid nitrogen storage tank will be under negative pressure. In severe cases, this can cause the storage tank to collapse and deform, creating serious safety hazards.

[0004] Therefore, in view of this, we have studied and improved the existing structure to address its shortcomings, and proposed a sealing gas device for the jacket of a cryogenic liquid atmospheric pressure storage tank. Utility Model Content

[0005] The purpose of this invention is to provide a sealing gas device for the jacket of a cryogenic liquid atmospheric pressure storage tank, so as to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a cryogenic liquid atmospheric pressure storage tank jacketed sealing gas device, comprising a liquid nitrogen storage tank, the liquid nitrogen storage tank being composed of an outer shell, an inner liner, and a jacket, the outer shell serving as the outermost layer of the liquid nitrogen storage tank, the inner liner being disposed inside the outer shell, and a jacket being disposed between the outer shell and the inner liner, a circulation pipeline being fixedly connected to the lower left side of the outer shell, a self-pressurizing device being connected to the front section of the circulation pipeline, a self-pressurizing regulating valve being connected to the rear section of the circulation pipeline, a low-pressure nitrogen storage device being disposed on the upper side of the liquid nitrogen storage tank, a conveying pipeline being connected to the output port of the low-pressure nitrogen storage device, and a sealing device regulating valve being connected to the end section of the conveying pipeline.

[0007] Preferably, the lower end of the conveying pipeline is connected to the inside of the outer shell, and the upper right end of the circulation pipeline is connected to the conveying pipeline, and the connection point between the circulation pipeline and the conveying pipeline is located above the sealing valve.

[0008] Preferably, the upper inlet of the inner liner is fixedly connected to an inlet valve pipe, and the inlet valve pipe penetrates the outer shell.

[0009] Preferably, the outlet of the inner liner is fixedly connected to an inlet pipe, and the inlet pipe also penetrates the outer shell, and a control valve is connected to the middle section of the inlet pipe.

[0010] Preferably, a pressure relief valve is fixedly connected to the upper right side of the outer surface of the housing, and the pressure relief valve is a one-way valve that can be opened and closed by electromagnetic control.

[0011] Compared with the prior art, the beneficial effects of this utility model are:

[0012] This invention utilizes a liquid nitrogen storage tank, a pressure sensor, a circulation pipeline, a self-pressurizing device, a self-pressurizing regulating valve, a low-pressure nitrogen storage device, a delivery pipeline, and a sealing gas regulating valve. The liquid nitrogen storage tank circulates through the circulation pipeline. During circulation, nitrogen is replenished by the self-pressurizing device and the self-pressurizing regulating valve, returning to the liquid nitrogen storage tank and maintaining its internal pressure. The low-pressure nitrogen storage device continuously replenishes pressure to the liquid nitrogen storage tank via the delivery pipeline, preventing pressure loss and deformation / collapse of the outer shell due to external pressure. The circulation pipeline is also connected to the delivery pipeline, meaning the circulating pressure also needs to enter the liquid nitrogen storage tank through the delivery pipeline. The nitrogen storage tank and the delivery pipeline are controlled by a sealing gas regulating valve, which allows for unified control of both the circulating pressure and the replenishment pressure. Under the control of the sealing gas regulating valve, the circulating pipeline, the self-pressurizer, the self-pressurizing regulating valve, the low-pressure nitrogen storage device, and the delivery pipeline together form a complete pressure control system for maintaining the circulating pressure and replenishing the new pressure. The pressure sensor monitors the internal pressure of the interlayer in real time, and adjusts the amount of pressure replenishment according to the pressure situation. The overall circulation combined with pressure loss replenishment can replace the moisture in the interlayer with nitrogen, preventing the perlite from getting damp or the vacuum level from decreasing. Under stable pressure conditions, the circulation combined with self-pressurizing replenishment can significantly reduce energy consumption. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0014] In the diagram: 1. Liquid nitrogen storage tank; 101. Outer shell; 102. Inner liner; 103. Jacket; 2. Pressure sensor; 3. Circulation pipeline; 4. Self-pressurizer; 5. Self-pressurizing regulating valve; 6. Low-pressure nitrogen storage device; 7. Delivery pipeline; 8. Sealing gas regulating valve; 9. Inlet valve pipe; 10. Inlet pipe; 11. Control valve; 12. Pressure relief valve. Detailed Implementation

[0015] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0016] like Figure 1 As shown, a cryogenic liquid atmospheric pressure storage tank jacketed sealing gas device includes a liquid nitrogen storage tank 1. The liquid nitrogen storage tank 1 is composed of an outer shell 101, an inner liner 102, and a jacket 103. The outer shell 101 serves as the outermost layer of the liquid nitrogen storage tank 1. The inner liner 102 is disposed inside the outer shell 101. The jacket 103 is disposed between the outer shell 101 and the inner liner 102. A circulation pipeline 3 is fixedly connected to the lower left side of the outer shell 1. A self-pressurizing device 4 is connected to the front end of the circulation pipeline 3, and a self-pressurizing regulating valve 5 is connected to the rear end of the circulation pipeline 3. A low-pressure nitrogen storage device 6 is disposed on the upper side of the liquid nitrogen storage tank 1. A delivery pipeline 7 is connected to the output port of the low-pressure nitrogen storage device 6, and a sealing device regulating valve 8 is connected to the end of the delivery pipeline 7.

[0017] By adopting the above technical solution, the liquid nitrogen storage tank 1 circulates through the circulation pipeline 3. During the circulation process, nitrogen gas will pass through the self-pressurizer 4 and the self-pressurizing regulating valve 5 to replenish the pressure, and then return to the liquid nitrogen storage tank 1, which can maintain the pressure inside the liquid nitrogen storage tank 1.

[0018] The low-pressure nitrogen storage device 6 can continuously replenish the pressure inside the liquid nitrogen storage tank 1 through the delivery pipeline 7, so as to avoid the situation where the outer shell 101 is squeezed by the external air pressure and deforms and collapses.

[0019] Furthermore, the lower end of the conveying pipe 7 is connected to the interior of the housing 101, and the upper right end of the circulation pipe 3 is connected to the conveying pipe 7, and the connection point between the circulation pipe 3 and the conveying pipe 7 is located above the sealing regulating valve 8.

[0020] By adopting the above technical solution, the circulation pipeline 3 is also connected to the delivery pipeline 7, that is, the circulation pressure also needs to enter the liquid nitrogen storage tank 1 through the delivery pipeline 7. The delivery pipeline 7 is controlled by the sealing gas regulating valve 8, which means that the circulation pressure and the replenishment pressure can be controlled in a unified manner at the same time. Under the control of the sealing gas regulating valve 8, the circulation pipeline 3, the self-pressurizer 4, the self-pressurizing regulating valve 5, the low-pressure nitrogen storage device 6 and the delivery pipeline 7 together form a complete pressure control system for maintaining the circulation pressure and replenishing the new pressure.

[0021] Furthermore, the upper inlet of the inner liner 102 is fixedly connected to an inlet valve pipe 9, and the inlet valve pipe 9 penetrates the outer shell 101.

[0022] By adopting the above technical solution, the imported valve pipe 9 can be used to replenish the inner liner 102 with cryogenic liquid.

[0023] Furthermore, the outlet of the inner liner 102 is fixedly connected to the inlet pipe 10, and the inlet pipe 10 also penetrates the outer shell 101, and a control valve 11 is connected to the middle section of the inlet pipe 10.

[0024] The left side of the inlet pipe 10, located above the control valve 11, can be connected to a return pipe. The return pipe is connected to the inner liner 102 and is a one-way valve pipe.

[0025] By adopting the above technical solution, the opening and closing of the inlet pipe 10 is controlled by the control valve 11, thereby controlling the flow and use of cryogenic liquid.

[0026] Furthermore, a pressure relief valve 12 is fixedly connected to the upper right side of the outer surface of the housing 101, and the pressure relief valve 12 is a one-way valve that can be opened and closed by electromagnetic control.

[0027] By adopting the above technical solution, the device will automatically open when the pressure exceeds the set value, preventing damage from overpressure.

[0028] Working Principle: When using this cryogenic liquid atmospheric pressure storage tank jacket sealing gas device, firstly, the liquid nitrogen storage tank 1 circulates through the circulation pipeline 3. During the circulation process, nitrogen gas is replenished by the self-pressurizer 4 and the self-pressurization regulating valve 5, thus returning to the liquid nitrogen storage tank 1, maintaining the pressure inside the liquid nitrogen storage tank 1. Meanwhile, the low-pressure nitrogen storage device 6 continuously replenishes the pressure inside the liquid nitrogen storage tank 1 through the delivery pipeline 7, preventing pressure loss and the outer shell 101 from being squeezed by external air pressure, causing deformation and collapse. The circulation pipeline 3 is also connected to the delivery pipeline 7, meaning that the circulating pressure also needs to enter the liquid nitrogen storage tank 1 through the delivery pipeline 7. The delivery pipeline 7 is controlled by the sealing gas regulating valve 8, thus enabling the same pressure distribution as the liquid nitrogen storage tank 1. The circulating pressure and replenishment pressure are uniformly controlled, so that the circulating pipeline 3, the self-pressurizer 4, the self-pressurizing regulating valve 5, the low-pressure nitrogen storage device 6, and the delivery pipeline 7, under the control of the sealing regulating valve 8, together form a complete pressure control system for maintaining circulating pressure and replenishing new pressure. The pressure sensor 2 monitors the internal pressure of the jacket 103 in real time, and adjusts the amount of pressure replenishment according to the pressure situation. The overall circulation and pressure loss replenishment can replace the moisture in the jacket with nitrogen, preventing the perlite from getting damp or the vacuum degree from decreasing. Under the pressure stabilization state, the circulation and self-pressurizing replenishment can significantly reduce energy consumption. This is the working principle of the sealing gas device for the jacket of the cryogenic liquid atmospheric pressure storage tank.

Claims

1. A sealing gas device for a cryogenic liquid atmospheric pressure storage tank jacket, comprising a liquid nitrogen storage tank (1), characterized in that, The liquid nitrogen storage tank (1) is composed of an outer shell (101), an inner liner (102), and a sandwich layer (103). The outer shell (101) is the outermost layer of the liquid nitrogen storage tank (1). The inner liner (102) is provided inside the outer shell (101). A sandwich layer (103) is provided between the outer shell (101) and the inner liner (102). A circulation pipeline (3) is fixedly connected to the lower left side of the outer shell (101). A self-pressurizing device (4) is connected to the front section of the circulation pipeline (3). A self-pressurizing regulating valve (5) is connected to the rear section of the circulation pipeline (3). A low-pressure nitrogen storage device (6) is provided on the upper side of the liquid nitrogen storage tank (1). A delivery pipeline (7) is connected to the output port of the low-pressure nitrogen storage device (6). A sealing device regulating valve (8) is connected to the end section of the delivery pipeline (7).

2. The sealing gas device for the jacket of a cryogenic liquid atmospheric pressure storage tank according to claim 1, characterized in that, The lower end of the conveying pipeline (7) is connected to the inside of the outer shell (101), and the upper right end of the circulation pipeline (3) is connected to the conveying pipeline (7), and the connection position between the circulation pipeline (3) and the conveying pipeline (7) is located above the sealing regulating valve (8).

3. The sealing gas device for the jacket of a cryogenic liquid atmospheric pressure storage tank according to claim 1, characterized in that, The upper inlet of the inner liner (102) is fixedly connected to an inlet valve pipe (9), and the inlet valve pipe (9) penetrates the outer shell (101).

4. The sealing gas device for the jacket of a cryogenic liquid atmospheric pressure storage tank according to claim 1, characterized in that, The outlet of the inner liner (102) is fixedly connected to the inlet pipe (10), and the inlet pipe (10) also penetrates the outer shell (101), and a control valve (11) is connected to the middle section of the inlet pipe (10).

5. The sealing gas device for the jacket of a cryogenic liquid atmospheric pressure storage tank according to claim 1, characterized in that, A pressure relief valve (12) is fixedly connected to the upper right side of the outer surface of the outer shell (101), and the pressure relief valve (12) is a one-way valve that can be opened and closed by electromagnetic control.

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