Liquid carbon dioxide storage tank capable of achieving constant-pressure cooling

Abstract

The liquid carbon dioxide storage tank comprises an outer tank assembly, an inner tank assembly, a constant-pressure piston assembly and a spiral pipe, the outer tank assembly comprises an outer tank, the inner tank assembly comprises an inner tank, the inner tank is sealed and coaxially arranged in an inner cavity of the outer tank, and a vacuum gap is reserved between the outer surface of the inner tank and the inner surface of the outer tank. The bottom surface of the inner tank is fixedly connected with the lower tank body of the outer tank, the spiral pipe is wound on the outer surface of the inner tank, a gap is reserved between the spiral pipe and the inner surface of the outer tank, a refrigerant medium for refrigeration flows in the spiral pipe, and external pipelines at two ends of the spiral pipe hermetically extend out of the outer tank and are connected with a refrigerant station; a sealing piston of the constant-pressure piston assembly is coaxially arranged on the top of an inner cavity of the inner tank in a sliding mode and keeps the pressure in a lower cavity of the inner tank constant. According to the liquid carbon dioxide storage tank capable of achieving constant-pressure cooling, the defect that liquid carbon dioxide is continuously gasified in the storage tank can be overcome.

Description

Technical Field

[0001] The utility model relates to the technical field of carbon dioxide storage tanks, in particular to a liquid carbon dioxide storage tank capable of constant pressure and temperature reduction. Background Art

[0002] Liquid carbon dioxide refers to carbon dioxide gas liquefied into liquid form under high pressure and low temperature. Liquid carbon dioxide is a refrigerant that can be used to preserve food, as a fire extinguisher, and for artificial rainfall. It is also an industrial raw material that can be used to make soda ash, urea, and soda.

[0003] Liquid carbon dioxide needs to be stored in storage tanks under high pressure and low temperature conditions. The liquid carbon dioxide in the tank will continuously vaporize through heat exchange with the outside air through the tank body, which will cause the pressure in the tank to increase. When the pressure rises to the predetermined value, the carbon dioxide gas will be discharged from the safety valve, resulting in a waste of carbon dioxide.

[0004] The utility model patent with authorization announcement number CN210424475U discloses a carbon dioxide liquefied storage tank, including a tank body, a liquid inlet pipe and a liquid outlet pipe are arranged at the lower end of the tank body, the other end of the liquid outlet pipe is connected to the lower end of the heat exchanger shell, the upper end of the heat exchanger shell is connected to one end of a first row of pipes, the first row of pipes is connected to one end of a second exhaust pipe through a three-way joint, the other end of the second exhaust pipe is connected to a buffer tank, the buffer tank is connected to one end of a third exhaust pipe, the other end of the third exhaust pipe is connected to the upper end of the tank body, a first safety valve is installed on the third exhaust pipe, a fourth exhaust pipe is installed on the upper end of the buffer tank, and a second safety valve is installed on the fourth exhaust pipe; the lower end of the heat exchanger tube side is connected to one end of a water inlet pipe, and the upper end of the heat exchanger tube side is connected to one end of a first drain pipe.

[0005] The above patent discloses a carbon dioxide liquefied storage tank. When the tank pressure is too high, the carbon dioxide gas enters the buffer tank through the first safety valve for storage, thus avoiding the direct discharge of carbon dioxide. However, the problem is not solved from the root, that is, it cannot prevent the liquid carbon dioxide from continuing to gasify.

[0006] Therefore, it is necessary to develop a liquid carbon dioxide storage tank that can maintain constant pressure and reduce temperature in view of the above defects. Utility Model Content

[0007] The utility model aims to provide a liquid carbon dioxide storage tank capable of constant pressure and temperature reduction, which can solve the defect that the liquid carbon dioxide is continuously gasified in the storage tank.

[0008] In order to solve the above technical problems, the utility model adopts the following technical solutions:

[0009] The utility model discloses a liquid carbon dioxide storage tank capable of constant pressure temperature reduction, comprising an outer tank assembly, an inner tank assembly, a constant pressure piston assembly and a spiral tube, wherein the outer tank assembly comprises an outer tank, the inner tank assembly comprises an inner tank, the inner tank is sealed and coaxially arranged in the inner cavity of the outer tank, a vacuum gap is reserved between the outer surface of the inner tank and the inner surface of the outer tank, the bottom surface of the inner tank is fixedly connected to the lower tank body of the outer tank, liquid carbon dioxide is contained in the bottom of the inner tank, the bottom wall of the inner tank is connected to a pipe joint for entering and exiting the liquid carbon dioxide; the spiral tube is wound around the outer surface of the inner tank, a gap is reserved between the spiral tube and the inner surface of the outer tank, a refrigerant medium for refrigeration flows in the spiral tube, the external pipes at both ends of the spiral tube are sealed to protrude from the outer tank and are connected to a refrigerant station; the sealing piston of the constant pressure piston assembly is coaxially slidably arranged at the top of the inner cavity of the inner tank and keeps the pressure in the lower cavity of the inner tank constant.

[0010] Furthermore, the constant-pressure piston assembly also includes a telescopic unit, a pressure transmitter and a controller, the telescopic unit is installed on the top cover of the inner tank, the telescopic rod of the telescopic unit extends into the inner cavity of the inner tank, and the sealing piston is fixed at the bottom end of the telescopic rod; the pressure transmitter is electrically connected to the controller; the pressure transmitter is connected to the lower cavity of the inner tank through a connecting pipe, and the connecting pipe seals and passes through the outer tank.

[0011] Furthermore, the inner tank assembly also includes a temperature transmitter, which is electrically connected to the controller; a temperature probe of the temperature transmitter is inserted into the lower cavity of the inner tank, and the temperature probe is sealed and passes through the outer tank.

[0012] Furthermore, it also includes an air nozzle valve, which is connected to the inner cavity of the outer tank.

[0013] Furthermore, it also includes a vacuum gauge, and the measuring port of the vacuum gauge is connected to the inner cavity of the outer tank.

[0014] Furthermore, the outer tank comprises an upper tank body and the lower tank body, the lower tank body and the upper tank body are connected together via a flange, and a sealing member is provided on abutting surface of the flange.

[0015] Furthermore, the cross section of the spiral tube is rectangular, and the inner side surface of the spiral tube is attached to the outer wall of the inner tank.

[0016] Compared with the prior art, the beneficial technical effects of the utility model are:

[0017] The utility model discloses a liquid carbon dioxide storage tank capable of constant pressure and temperature reduction. The constant pressure piston assembly is used to keep the liquid carbon dioxide at a constant pressure and the refrigerant in the spiral tube is used to keep the liquid carbon dioxide within a required temperature range. The vacuum gap can play a role in heat insulation. In summary, the liquid carbon dioxide is always kept under suitable storage conditions, avoiding the phenomenon of continuous gasification. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The utility model will be further described below in conjunction with the accompanying drawings.

[0019] Figure 1 This is a schematic diagram of the main cross-sectional structure of the utility model of a liquid carbon dioxide storage tank capable of constant pressure and temperature reduction;

[0020] Figure 2 for Figure 1 Schematic diagram of the structure at point A in the middle.

[0021] Explanation of the reference numerals: 1. outer tank; 101. lower tank body; 102. upper tank body; 2. inner tank; 201. top cover; 3. spiral tube; 301. external pipeline; 4. sealing piston; 5. telescopic unit; 501. hydraulic pipeline; 6. pressure transmitter; 601. connecting pipe; 7. temperature transmitter; 701. temperature probe; 8. air nozzle valve; 9. vacuum gauge; 10. controller. DETAILED DESCRIPTION

[0022] The core of the utility model is to provide a liquid carbon dioxide storage tank capable of constant pressure and temperature reduction, which can solve the defect that the liquid carbon dioxide is continuously gasified in the storage tank.

[0023] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0024] In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", "middle", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention.

[0025] With reference to the accompanying drawings, Figure 1This is a schematic diagram of the main cross-sectional structure of the utility model of a liquid carbon dioxide storage tank capable of constant pressure and temperature reduction; Figure 2 for Figure 1 Schematic diagram of the structure at point A in the middle.

[0026] In a specific embodiment of the present invention, Figure 1 and 2 As shown, it includes an outer tank assembly, an inner tank assembly, a constant pressure piston assembly and a spiral tube 3. The outer tank assembly includes an outer tank 1, and the inner tank assembly includes an inner tank 2. The inner tank 2 is sealed and coaxially arranged in the inner cavity of the outer tank 1. A vacuum gap is left between the outer surface of the inner tank 2 and the inner surface of the outer tank 1. The bottom surface of the inner tank 2 is welded to the lower tank body 101 of the outer tank 1. Liquid carbon dioxide is contained in the bottom of the inner tank 2. The bottom wall of the inner tank 2 is connected to the pipe joint for the inlet and outlet of liquid carbon dioxide; the spiral tube 3 is wrapped around the outer surface of the inner tank 2. A gap is left between the spiral tube 3 and the inner surface of the outer tank 1. A refrigerant medium for refrigeration flows in the spiral tube 3. The external pipes 301 at both ends of the spiral tube 3 are sealed and protrude out of the outer tank 1. The protruding end of the external pipe 301 is connected to a refrigerant station arranged outside; the sealing piston 4 of the constant pressure piston assembly is coaxially slidably arranged at the top of the inner cavity of the inner tank 2 and keeps the pressure in the lower cavity of the inner tank 2 constant. The external pipe 301 protrudes out of the outer tank 1 through a sealing ring. Its specific structure can be referred to Figure 2 As shown. The refrigerant exchanges heat with the spiral tube 3, the spiral tube 3 exchanges heat with the inner tank 2, and the inner tank 2 exchanges heat with the liquid carbon dioxide and the gaseous carbon dioxide. The vacuum gap has a heat insulating effect, reducing the heat exchange between carbon dioxide and the outside. The pipe joint for the inlet and outlet of the liquid carbon dioxide of the inner tank 2 passes through the lower tank body 101 and is connected to the inner tank 2 threadedly. A lifting ring is provided on the top of the upper tank body 102.

[0027] like Figure 1 As shown, the constant pressure piston assembly also includes a telescopic unit 5, a pressure transmitter 6 and a controller 10. The telescopic unit 5 is installed on the top cover 201 of the inner tank 2 through a sealing gasket and bolts. The telescopic rod of the telescopic unit 5 extends into the inner cavity of the inner tank 2. The sealing piston 4 is welded or threadedly connected to the bottom end of the telescopic rod; the pressure transmitter 6 is electrically connected to the controller 10; the pressure transmitter 6 is connected to the lower cavity of the inner tank 2 through a connecting pipe 601, and the connecting pipe 601 passes through the outer tank 1 in a sealed manner. The controller 10 is installed on the legs of the lower tank body 101.

[0028] The telescopic unit 5 specifically adopts a hydraulic push rod, and the hydraulic pipeline 501 of the hydraulic push rod is sealed and protrudes out of the top plate of the outer tank 1. The protruding end of the hydraulic pipeline 501 is connected to the hydraulic station arranged outside. The hydraulic station is electrically connected to the controller 10 of the constant pressure component. The controller 10 controls the hydraulic station to supply oil to the hydraulic push rod according to the signal transmitted by the pressure transmitter 6, driving the telescopic rod of the hydraulic push rod to extend or contract. When the internal pressure of the liquid carbon dioxide rises, the telescopic rod contracts. When the internal pressure of the liquid carbon dioxide drops, the telescopic rod extends, so that the pressure of the lower cavity of the inner tank 2 is in a dynamic equilibrium state. Figure 2 As shown, the hydraulic pipeline 501 and the top plate of the outer tank 1 are sealed by a sealing ring.

[0029] like Figure 1 As shown, the inner tank assembly also includes a temperature transmitter 7, which is electrically connected to the controller 10; the temperature probe 701 of the temperature transmitter 7 is inserted into the lower cavity of the inner tank 2, and the temperature probe 701 passes through the outer tank 1 in a sealed manner. The temperature transmitter 7 transmits the temperature of the liquid carbon dioxide to the controller 10, and the controller 10 can control the flow rate of the refrigerant medium supplied by the refrigerant station according to the specific situation; the temperature probe 701 is sealedly connected to the inner tank 2 pipe thread; the outer tank 1 is provided with a through hole for the temperature probe 701 to pass through, and a sealing ring is provided in the through hole. The specific structure can be referred to Figure 2 shown.

[0030] like Figure 1 As shown, it also includes a gas nozzle valve 8, which is connected to the inner cavity of the outer tank 1. The gas nozzle valve 8 is connected to an external vacuum pump for vacuuming, and the gas nozzle valve 8 is closed after the vacuuming is completed.

[0031] like Figure 1 As shown, a vacuum gauge 9 is also included, and a measuring port of the vacuum gauge 9 is communicated with the inner cavity of the outer tank 1. The vacuum state inside the outer tank 1 can be observed through the vacuum gauge 9, and it can be evacuated when appropriate.

[0032] like Figure 1 As shown, the outer tank 1 comprises an upper tank body 102 and a lower tank body 101, and the lower tank body 101 is connected to the upper tank body 102 through a flange. Specifically, a sealing gasket is provided on the flange joint surface.

[0033] like Figure 1 As shown, the cross section of the spiral tube 3 is rectangular or circular, preferably rectangular, and the inner side surface of the rectangular spiral tube 3 is attached to the outer wall of the inner tank 2.

[0034] The utility model discloses a liquid carbon dioxide storage tank capable of constant pressure and temperature reduction. The working principle is as follows: under normal conditions, the controller 10 controls the telescopic unit 5 to remain stationary, and the controller 10 controls the flow rate of the refrigerant medium in the spiral tube 3 to be constant; when the outside temperature rises, the inner tank 2 is indirectly heated, and part of the liquid carbon dioxide in the inner tank 2 absorbs heat and gasifies, and the internal pressure of the liquid carbon dioxide rises. The pressure transmitter 6 and the temperature transmitter 7 simultaneously send signals to the controller 10, and the controller 10 controls the telescopic rod of the telescopic unit 5 to contract so that the pressure of the lower cavity of the inner tank 2 is in a dynamic equilibrium state. At the same time, the controller 10 controls the refrigerant station to increase the delivery of the refrigerant medium, and the heat of the carbon dioxide is taken away by the refrigerant medium, and the liquid carbon dioxide stops continuing to gasify; when the heat of the gaseous carbon dioxide is absorbed by the refrigerant medium, the pressure drops, and the pressure transmitter 6 sends a signal to the controller 10, and the controller 10 controls the telescopic rod of the telescopic unit 5 to extend so that the pressure of the lower cavity of the inner tank 2 is in a dynamic equilibrium state.

[0035] In this specification, each embodiment is described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the embodiments can be referred to each other, and the embodiments can be combined with each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant parts can be referred to the method part.

[0036] The embodiments described above are only descriptions of the preferred methods of the present invention, and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should fall within the protection scope determined by the claims of the present invention.

Claims

1. A liquid carbon dioxide storage tank capable of constant pressure and temperature reduction, It is characterized in that The invention comprises an outer tank assembly, an inner tank assembly, a constant pressure piston assembly and a spiral tube (3), wherein the outer tank assembly comprises an outer tank (1), and the inner tank assembly comprises an inner tank (2), wherein the inner tank (2) is sealed and coaxially arranged in the inner cavity of the outer tank (1), a vacuum gap is left between the outer surface of the inner tank (2) and the inner surface of the outer tank (1), the bottom surface of the inner tank (2) is fixedly connected to the lower tank body (101) of the outer tank (1), liquid carbon dioxide is contained at the bottom of the inner tank (2), and the bottom wall of the inner tank (2) is connected to the inlet and outlet A pipe joint for liquid carbon dioxide; the spiral tube (3) is wound around the outer surface of the inner tank (2), a gap is left between the spiral tube (3) and the inner surface of the outer tank (1), a refrigerant medium for refrigeration flows in the spiral tube (3), and the external pipes (301) at both ends of the spiral tube (3) are sealed and extend out of the outer tank (1) and connected to a refrigerant station; the sealing piston (4) of the constant pressure piston assembly is coaxially slidably arranged on the top of the inner cavity of the inner tank (2) and maintains a constant pressure in the lower cavity of the inner tank (2).

2. The liquid carbon dioxide storage tank capable of constant pressure and temperature reduction according to claim 1, Features: The constant pressure piston assembly also includes a telescopic unit (5), a pressure transmitter (6) and a controller (10); the telescopic unit (5) is installed on the top cover (201) of the inner tank (2); the telescopic rod of the telescopic unit (5) extends into the inner cavity of the inner tank (2); the sealing piston (4) is fixed at the bottom end of the telescopic rod; the pressure transmitter (6) is electrically connected to the controller (10); the pressure transmitter (6) is connected to the lower cavity of the inner tank (2) through a connecting pipe (601), and the connecting pipe (601) passes through the outer tank (1) in a sealed manner.

3. The liquid carbon dioxide storage tank capable of constant pressure and temperature reduction according to claim 2, Features: The inner tank assembly further comprises a temperature transmitter (7), and the temperature transmitter (7) is electrically connected to the controller (10); a temperature probe (701) of the temperature transmitter (7) is inserted into the lower cavity of the inner tank (2), and the temperature probe (701) is sealed and passes through the outer tank (1).

4. The liquid carbon dioxide storage tank capable of constant pressure and temperature reduction according to claim 1, Features: It also comprises an air nozzle valve (8), wherein the air nozzle valve (8) is communicated with the inner cavity of the outer tank (1).

5. The liquid carbon dioxide storage tank capable of constant pressure and temperature reduction according to claim 4, Features: It also comprises a vacuum gauge (9), wherein a measuring port of the vacuum gauge (9) is in communication with the inner cavity of the outer tank (1).

6. The liquid carbon dioxide storage tank capable of constant pressure and temperature reduction according to claim 1, Features: The outer tank (1) comprises an upper tank body (102) and a lower tank body (101); the lower tank body (101) and the upper tank body (102) are connected together via a flange; a sealing member is provided on the flange butt surface.

7. The liquid carbon dioxide storage tank capable of constant pressure and temperature reduction according to claim 1, Features: The cross section of the spiral tube (3) is rectangular, and the inner side surface of the spiral tube (3) is attached to the outer wall of the inner tank (2).

Images