Low-temperature storage tank with thermal insulation medium online compensation function

Abstract

The utility model relates to the technical field of thermal insulation of storage tanks of chemical devices, in particular to a low-temperature storage tank with a thermal insulation medium online compensation function. Comprising an inner tank body and an outer tank body, a thermal insulation medium online compensation device is arranged at the top of the outer tank body; the thermal insulation medium online compensation device comprises a pearlife compensation tank body, the bottom of the pearlife compensation tank body is fixedly communicated with the top of a closed cavity containing a thermal insulation medium through a pearlife compensation pipeline, and a control valve is arranged on the pearlife compensation pipeline. A pearlife supplementing valve is arranged at the top of the pearlife compensating tank body, and the pearlife compensating tank body is fixedly communicated with a vacuumizing unit through a vacuumizing port. The technical problem that the cold insulation effect of the top space of the tank wall of the low-temperature storage tank is reduced due to pearlife sedimentation is effectively solved, then the technical problems that the structure of the low-temperature storage tank is damaged and internal low-temperature media are boiled possibly caused by the technical problem are solved, and the operation safety of the low-temperature storage tank is effectively improved.

Description

Technical Field

[0001] The utility model relates to the technical field of heat preservation of storage tanks in chemical engineering devices, and particularly relates to a cryogenic storage tank with an online compensation function for heat preservation medium. Background Technique

[0002] In a chemical engineering device area, for higher volume density, substances such as hydrogen energy, natural gas, and oxygen are usually stored in cryogenic storage tanks in the form of cryogenic liquids for a long time.

[0003] In the prior art, a cryogenic storage tank mainly consists of an inner tank body and an outer tank body. Heat preservation media such as perlite sand need to be filled between the inner tank body and the outer tank body to ensure the cold insulation effect of the cryogenic storage tank.

[0004] Since the temperature of the storage tank changes from normal temperature to low temperature from the time of construction to operation, especially during the pre-cooling stage, the inner tank body shrinks due to cold, and the liquid level of the internal cryogenic liquid fluctuates up and down during operation. Inevitably, the perlite sand between the inner and outer tank bodies settles continuously under the action of its own gravity, resulting in a decrease in the cold insulation effect of the space at the top of the tank wall of the storage tank, causing cold leakage of the tank body, and thus possibly leading to damage to the structure of the storage tank or boiling of the internal cryogenic liquid, which has a relatively large potential safety hazard. Content of the Utility Model

[0005] The utility model provides a cryogenic storage tank with an online compensation function for heat preservation medium, aiming to solve the technical problem of the decrease in the cold insulation effect of the space at the top of the tank wall of the cryogenic storage tank caused by the settlement of perlite sand in the prior art.

[0006] To achieve the above purpose, the technical solution of the utility model is as follows:

[0007] The utility model provides a cryogenic storage tank with an online compensation function for heat preservation medium, including an inner tank body and an outer tank body. The outer tank body is sleeved on the outer peripheral side of the inner tank body. A closed cavity for accommodating the heat preservation medium is formed between the outer side wall of the inner tank body and the inner side wall of the outer tank body. A first heat preservation layer and a second heat preservation layer are sequentially arranged in the closed cavity along the direction away from the inner tank body. The first heat preservation layer is an elastic felt covering the surface of the outer side wall of the inner tank body, and the second heat preservation layer is perlite sand filled between the elastic felt and the inner side wall of the outer tank body. Its characteristic lies in that: an online compensation device for the heat preservation medium is arranged at the top of the outer tank body;

[0008] The online compensation device for the heat preservation medium includes a perlite compensation tank body. The bottom of the tank body of the perlite compensation tank body is fixedly connected to the top of a sealed cavity containing the heat preservation medium through a perlite compensation pipeline. A control valve is arranged on the perlite compensation pipeline. A perlite replenishment valve is arranged on the top of the tank body of the perlite compensation tank body. The perlite compensation tank body is fixedly connected to a vacuum pumping unit through a vacuum pumping port, and the perlite compensation tank body is fixedly connected to a nitrogen gas charging unit through a nitrogen gas charging port.

[0009] Furthermore, a plurality of groups of explosion-proof glass windows for observing the settlement of perlite are equidistantly arranged along the outer circumference of the outer tank body. Each group of explosion-proof glass windows consists of several pieces and is arranged vertically.

[0010] Furthermore, within the same group of explosion-proof glass windows, the vertical distance between two adjacent explosion-proof glass windows is 20 cm.

[0011] Furthermore, the number of each group of explosion-proof glass windows is four.

[0012] Furthermore, a humidity detection component is also arranged inside the perlite compensation tank body.

[0013] Furthermore, there are several perlite compensation tank bodies, which are arranged in a ring and evenly distributed on the outer edge of the outer tank body in a circumferential manner. The several perlite compensation tank bodies are respectively fixedly connected to the top of the sealed cavity containing the heat preservation medium through the perlite compensation pipelines.

[0014] Furthermore, the number of the perlite compensation tank bodies is four.

[0015] Furthermore, there is one perlite compensation tank body, which is arranged at the crown of the outer tank body. The perlite compensation tank body replenishes perlite to the top of the sealed cavity containing the heat preservation medium through several perlite compensation pipelines.

[0016] Furthermore, the number of the perlite compensation pipelines is four.

[0017] The beneficial effects achieved by the present utility model are as follows:

[0018] 1) By adopting the technical measure of arranging an online compensation device for the heat preservation medium on the top of the outer tank body of the cryogenic storage tank, the present utility model effectively solves the technical problem of the decline in the cold insulation effect of the space at the top of the tank wall of the cryogenic storage tank caused by the settlement of perlite, and further avoids the technical problems of the possible structural damage of the cryogenic storage tank and the boiling of the internal cryogenic medium caused thereby, effectively improving the safety of the operation of the cryogenic storage tank;

[0019] 2) By adopting technical measures such as vacuum pumping and nitrogen replacement for the perlite compensation tank of the present utility model, the perlite stored in the perlite compensation tank can be effectively dried and deoxidized, and the influence of water vapor, etc. on the heat preservation effect of the perlite can be effectively reduced;

[0020] 3) By adopting the technical measure of arranging an array of explosion-proof glass windows for observing the settlement of perlite on the outer tank of the present utility model, the settlement of perlite in the top space of the tank wall of the cryogenic storage tank can be conveniently observed, and the operation and heat preservation state of the cryogenic storage tank can be timely understood;

[0021] 4) By adopting the technical measure of arranging a humidity detection component inside the perlite compensation tank of the present utility model, the operator can conveniently observe the water content of the perlite stored inside the perlite compensation tank, and then can timely take measures to dry it;

[0022] 5) By adopting the technical measure of a safety valve group, when abnormal conditions occur inside the cryogenic tank, the cryogenic storage tank and the perlite compensation tank can be effectively separated, thereby improving the operation safety of the present utility model. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on the structures shown in these drawings.

[0024] Figure 1 is the front view (partial section) of Embodiment 1 of the present utility model;

[0025] Figure 2 is the sectional view of Embodiment 1 of the present utility model;

[0026] Figure 3 is the top view structural schematic diagram of Embodiment 1 of the present utility model;

[0027] Figure 4 is the sectional view of Embodiment 2 of the present utility model;

[0028] Figure 5 is the top view structural schematic diagram of Embodiment 2 of the present utility model.

[0029] In the figure, 1 is the inner tank body; 2 is the outer tank body; 2-1 is the explosion-proof glass window; 3 is the elastic felt; 4 is the perlite; 5 is the on-line compensation device for the heat preservation medium; 5-1 is the perlite compensation tank body; 5-2 is the perlite compensation pipeline; 5-3 is the control valve; 5-4 is the perlite supplement valve; 5-5 is the vacuum pumping port; 5-6 is the nitrogen charging port; 5-7 is the humidity detection component. Specific implementation mode

[0030] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0031] It should be noted that if there are directional indications (such as up, down, left, right, front, back...) involved in the embodiments of the present invention, then the directional indications are only used to explain the relative position relationship and movement conditions between components in a specific posture (as shown in the drawings). If the specific posture changes, the directional indications will also change accordingly.

[0032] In addition, if there are descriptions such as "first" and "second" involved in the embodiments of the present invention, then the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In addition, the meaning of "and / or" appearing throughout the text is that it includes three parallel solutions. Taking "A and / or B" as an example, it includes solution A, or solution B, or a solution that satisfies both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the fact that those of ordinary skill in the art can implement them. When the combination of technical solutions results in contradictions or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the protection scope required by the present invention.

[0033] Embodiment 1

[0034] As Figures 1 to 3As shown in the figure, the present utility model provides a cryogenic storage tank with an online compensation function for heat preservation medium, which includes an inner tank body 1 and an outer tank body 2. The outer tank body 2 is sleeved on the outer peripheral side of the inner tank body 1 and is spaced at a certain distance. A sealed cavity for accommodating the heat preservation medium is formed between the outer side wall of the inner tank body 1 and the inner side wall of the outer tank body 2. A first heat preservation layer and a second heat preservation layer are sequentially arranged inside the sealed cavity along the direction away from the inner tank body 1. The first heat preservation layer is an elastic felt 3 covering the surface of the outer side wall of the inner tank body 1, and the second heat preservation layer is perlite sand 4 filled between the elastic felt 3 and the inner side wall of the outer tank body 2. An online compensation device 5 for heat preservation medium is arranged at the top of the outer tank body 2.

[0035] The online compensation device 5 for heat preservation medium includes several perlite sand compensation tank bodies 5-1 that are annular and evenly distributed in a circumferential manner at the outer edge of the outer tank body 2. The perlite sand compensation tank bodies 5-1 are used to store the perlite sand for supplementation. The bottom parts of several perlite sand compensation tank bodies 5-1 respectively supplement perlite sand to the top of the sealed cavity for accommodating the heat preservation medium through perlite sand compensation pipelines 5-2.

[0036] Furthermore, the number of the online compensation devices 5 for heat preservation medium is four, and the four online compensation devices 5 for heat preservation medium are evenly distributed in a circumferential manner.

[0037] A control valve 5-3 is arranged on the perlite sand compensation pipeline 5-2. The control valve 5-3 is used to control the opening and closing when the perlite sand flows slowly or stops in the perlite sand compensation pipeline 5-2, so as to ensure the smooth and effective supplementation of perlite sand.

[0038] A perlite sand supplementation valve 5-4 is arranged at the top of the perlite sand compensation tank body 5-1. The perlite sand supplementation valve 5-4 is used to supplement perlite sand into the perlite sand compensation tank body 5-1.

[0039] The perlite sand compensation tank body 5-1 is fixedly connected to a vacuum pumping unit through a vacuum pumping port 5-5 for removing oxygen and water vapor inside the perlite sand compensation tank body 5-1. Since perlite sand has strong water absorption, the influence of oxygen and water vapor on the perlite sand in the perlite sand compensation tank body 5-1 can be effectively reduced.

[0040] The perlite sand compensation tank body 5-1 is fixedly connected to a nitrogen gas charging unit through a nitrogen gas charging port 5-6. Firstly, it can promote the formation of a pressure difference between the perlite sand compensation tank body 5-1 and the sealed cavity for accommodating the heat preservation medium, so as to facilitate the smooth entry of perlite sand into the sealed cavity for accommodating the heat preservation medium and compaction. Secondly, when the vacuum pumping unit removes oxygen and water vapor from the perlite sand inside the perlite sand compensation tank body 5-1, gas replacement of the inside of the perlite sand compensation tank body 5-1 can be completed, thereby accelerating the work process of the vacuum pumping unit for removing oxygen and water vapor.

[0041] On the upper half of the outer tank body 2, a group of explosion-proof glass windows 2-1 for observing the settlement of perlite are provided. Each group of explosion-proof glass windows 2-1 consists of several pieces, which are vertically arranged at intervals of 20 cm downward from the top of the tank body. In this way, the operator can conveniently observe the settlement of perlite inside the closed cavity containing the heat-insulating medium, and timely understand the heat-insulating state of the operation of the storage tank.

[0042] Furthermore, the number of each group of the explosion-proof glass windows 2-1 is four.

[0043] A humidity detection component 5-7 is also arranged inside the perlite compensation tank body 5-1. Since dry perlite can quickly absorb water molecules in the air once it comes into contact with the air, the thermal conductivity of water is 25 times that of air, and water will freeze at low temperatures, while the thermal conductivity of ice is 100 times that of air. In this way, the heat-insulating performance of the perlite after absorbing moisture will be greatly damaged. By arranging the humidity detection component 5-7 inside the perlite compensation tank body 5-1, the operator can conveniently observe the water content of the perlite stored inside the perlite compensation tank body 5-1 and can take measures to dry it in time.

[0044] Furthermore, the humidity detection component 5-7 includes a humidity sensor and an instrument or display screen for displaying values.

[0045] Embodiment 2

[0046] As Figures 4 to 5 shown, the present utility model provides a cryogenic storage tank with an on-line compensation function for heat-insulating medium, including an inner tank body 1 and an outer tank body 2. The outer tank body 2 is sleeved on the outer peripheral side of the inner tank body 1 and is spaced at a certain distance. The closed cavity for containing the heat-insulating medium is formed between the outer side wall of the inner tank body 1 and the inner side wall of the outer tank body 2. A first heat-insulating layer and a second heat-insulating layer are sequentially arranged inside the closed cavity along the direction away from the inner tank body 1. The first heat-insulating layer is an elastic felt 3 covering the surface of the outer side wall of the inner tank body 1, and the second heat-insulating layer is perlite 4 filled between the elastic felt 3 and the inner side wall of the outer tank body 2. An on-line compensation device 5 for heat-insulating medium is arranged at the top of the outer tank body 2.

[0047] The on-line compensation device 5 for heat-insulating medium includes a perlite compensation tank body 5-1 arranged at the crown of the outer tank body 2, and the perlite compensation tank body 5-1 is used for storing perlite for supplementation.

[0048] The bottom of the tank body of the perlite compensation tank body 5-1 replenishes perlite to the top of the closed cavity for containing the heat-insulating medium through several perlite compensation pipelines 5-2.

[0049] Furthermore, the number of the perlite compensation pipelines 5-2 is four.

[0050] Control valves 5-3 are respectively arranged on several of the perlite compensation pipelines 5-2. The control valves 5-3 are used to control the opening and closing when the perlite flows slowly or stops in the perlite compensation pipeline 5-2, ensuring the smooth and effective replenishment of perlite.

[0051] A perlite replenishment valve 5-4 is arranged at the top of the tank body of the perlite compensation tank body 5-1. The perlite replenishment valve 5-4 is used to replenish perlite into the perlite compensation tank body 5-1.

[0052] The perlite compensation tank body 5-1 is fixedly communicated with a vacuum pumping unit through a vacuum pumping port 5-5 to remove oxygen and water vapor inside the perlite compensation tank body 5-1. Since perlite has strong water absorption, the influence of oxygen and water vapor on the perlite in the perlite compensation tank body 5-1 can be effectively reduced.

[0053] The perlite compensation tank body 5-1 is fixedly communicated with a nitrogen gas stamping unit through a nitrogen gas stamping port 5-6. Firstly, it can promote the formation of a pressure difference between the perlite compensation tank body 5-1 and the sealed cavity containing the heat preservation medium, so as to facilitate the perlite to smoothly enter the sealed cavity containing the heat preservation medium and be compacted. Secondly, when the vacuum pumping unit removes oxygen and water vapor from the perlite inside the perlite compensation tank body 5-1, gas replacement of the inside of the perlite compensation tank body 5-1 can be completed, thereby accelerating the working process of the vacuum pumping unit for removing oxygen and water vapor.

[0054] A number of explosion-proof glass windows 2-1 for observing the settlement of perlite are arranged on the outer tank body 2. Each group of explosion-proof glass windows consists of several, and they are vertically arranged at intervals of 20 cm downward from the top of the tank body. In this way, operators can conveniently observe the settlement of perlite inside the sealed cavity containing the heat preservation medium, and timely understand the operation and heat preservation state of the storage tank.

[0055] A humidity detection component 5-7 is also arranged inside the perlite compensation tank body 5-1. Since dry perlite can quickly absorb water molecules in the air once it comes into contact with air, the thermal conductivity of water is 25 times that of air, and water will freeze at low temperatures, and the thermal conductivity of ice is 100 times that of air. In this way, the heat insulation performance of the perlite after absorbing moisture will be greatly damaged. By arranging the humidity detection component 5-7 inside the perlite compensation tank body 5-1, operators can conveniently observe the water content of the perlite stored inside the perlite compensation tank body 5-1 and can take measures to dry it in time.

[0056] Specifically, the working process of the present utility model is as follows:

[0057] During the actual operation process, when the operator observes through the explosion-proof glass window 2-1 that the perlite in the sealed cavity containing the heat-insulating medium has settled, first, the operator closes the control valve 5-3, and then simultaneously starts the vacuum pumping unit and the nitrogen gas charging unit to remove the water vapor and oxygen in the perlite stored inside the perlite compensation tank 5-1. Further, the vacuum pumping unit is closed, and the control valve 5-3 is opened. At this time, the nitrogen gas charging unit can promote the formation of a pressure difference between the perlite compensation tank 5-1 and the sealed cavity containing the heat-insulating medium, thereby facilitating the smooth entry of the perlite into the sealed cavity containing the heat-insulating medium and compaction. Further, when it is observed through the explosion-proof glass window 2-1 that the filling of the perlite in the sealed cavity containing the heat-insulating medium is completed, the nitrogen gas charging unit and the control valve 5-3 are closed, and the compensation of the quartz sand in the sealed cavity containing the heat-insulating medium can be completed.

[0058] When the perlite compensation tank 5-1 needs to be replenished with perlite, first close the control valve 5-3 to isolate the perlite compensation tank 5-1 from the sealed cavity containing the heat-insulating medium. At this time, open the perlite replenishment valve 5-4, and the perlite can be replenished.

[0059] The above are only optional embodiments of the present invention, and do not limit the patent scope of the present invention accordingly. Any equivalent structural transformation made by using the content of the specification and drawings of the present invention under the inventive concept of the present invention, or direct / indirect application in other related technical fields, is included in the patent protection scope of the present invention.

Claims

1. A low-temperature storage tank with an online compensation function for a heat-insulating medium, comprising an inner tank body (1) and an outer tank body (2), wherein the outer tank body (2) is sleeved on the outer peripheral side of the inner tank body (1), and a closed cavity for accommodating a heat-insulating medium is formed between the outer wall of the inner tank body (1) and the inner wall of the outer tank body (2), wherein a first heat-insulating layer and a second heat-insulating layer are sequentially arranged inside the closed cavity in a direction away from the inner tank body (1), wherein the first heat-insulating layer is an elastic felt (3) covering the outer wall surface of the inner tank body (1), and the second heat-insulating layer is pearlescent sand (4) filled between the elastic felt (3) and the inner wall of the outer tank body (2); characterized in that: A heat preservation medium online compensation device (5) is provided on the top of the outer tank body (2); The thermal insulation medium online compensation device (5) comprises a pearl sand compensation tank body (5-1), the tank bottom of the pearl sand compensation tank body (5-1) is fixedly connected to the top of a closed cavity containing the thermal insulation medium through a pearl sand compensation pipeline (5-2), a control valve (5-3) is arranged on the pearl sand compensation pipeline (5-2), a pearl sand replenishment valve (5-4) is arranged on the tank top of the pearl sand compensation tank body (5-1), the pearl sand compensation tank body (5-1) is fixedly connected to a vacuum pumping unit through a vacuum pumping port (5-5), and the pearl sand compensation tank body (5-1) is fixedly connected to a nitrogen pressurizing unit through a nitrogen pressurizing port (5-6).

2. A low-temperature storage tank with online compensation function of heat preservation medium according to claim 1, characterized in that: An array of explosion-proof glass windows (2-1) for observing the settling of pearl sand (4) are arranged at equal intervals along the outer periphery of the outer tank body (2), and each group of explosion-proof glass windows (2-1) is in plurality and arranged vertically.

3. A low-temperature storage tank with online compensation function of heat preservation medium according to claim 2, characterized in that: In the same group of explosion-proof glass windows (2-1), the vertical distance between two adjacent explosion-proof glass windows is 20 cm.

4. A low-temperature storage tank with online compensation function of heat preservation medium according to claim 3, characterized in that: The number of explosion-proof glass windows (2-1) in each group is four.

5. The low-temperature storage tank with online compensation function of heat preservation medium according to claim 1, characterized in that: A humidity detection component (5-7) is also provided in the pearl sand compensation tank (5-1).

6. A low-temperature storage tank with online compensation function for heat preservation medium according to any one of claims 1 to 5, characterized in that: The pearl sand compensation tank bodies (5-1) are in a plurality and are arranged at the outer edge of the outer tank body (2) in an annular shape and evenly divided into a circle. The plurality of pearl sand compensation tank bodies (5-1) are fixedly connected to the top of the closed cavity containing the heat preservation medium through the pearl sand compensation pipeline (5-2).

7. A low-temperature storage tank with online compensation function of heat preservation medium according to claim 6, characterized in that: The number of the pearl sand compensation tanks (5-1) is four.

8. A low-temperature storage tank with online compensation function for heat preservation medium according to any one of claims 1 to 5, characterized in that: The pearl sand compensation tank body (5-1) is one and is arranged at the arc top of the outer tank body (2). The pearl sand compensation tank body (5-1) replenishes pearl sand (4) to the top of the closed cavity containing the heat preservation medium through a plurality of pearl sand compensation pipelines (5-2).

9. A low-temperature storage tank with online compensation function of heat preservation medium according to claim 8, characterized in that: The number of the pearl sand compensation pipelines (5-2) is four.

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