Nitrogen heating storage tank

Abstract

The invention discloses a nitrogen heating storage tank, and relates to the technical field of nitrogen heating. The device comprises an outer tank body, a front heat exchanger, a rear heat exchanger, an inner storage tank and a confluence chamber, the inner storage tank is fixed in the outer tank body, a spiral interlayer body is arranged between the inner storage tank and the outer tank body, a flow storage area is formed between the inner storage tank and the bottom of the outer tank body, and a core pipe is arranged at the axis of the inner storage tank. Through the design combination of the inner storage tank and the outer storage tank and the arrangement of the front heat exchanger and the rear heat exchanger, a certain space can be provided in the outer tank body for nitrogen storage, the front heat exchanger is used for the use scene of low-demand nitrogen and is also used for supply of nitrogen storage, and the rear heat exchanger is used for the use scene of high-demand nitrogen; the nitrogen heating storage tank meets the use requirements of various nitrogen, avoids increasing the load and the required energy consumption of the heat exchanger, improves the use effect, the service life and the application range of the nitrogen heating storage tank, and meets the use scene with large nitrogen demand fluctuation.

Description

Technical Field

[0001] The present invention belongs to the technical field of nitrogen heating, and particularly relates to a nitrogen heating storage tank. Background Art

[0002] For the production requirements in some fields, heated nitrogen is required, and the amount of nitrogen needed during the production process is in a fluctuating state. At the same time, due to different nitrogen-requiring equipment in the production line, the fluctuation impact is greater.

[0003] Currently, nitrogen heating is directly carried out through heat exchange of nitrogen by a heat exchanger. The self-load range of the heat exchanger is limited. Once the demand is excessive at a certain moment, it is necessary to increase the nitrogen delivery speed of the heat exchanger and the delivery speed of the medium. The heat exchanger is in a high-load state, which will affect the service effect and life of the heat exchanger in the long term.

[0004] Therefore, designing a heating storage tank that can store a certain amount of nitrogen to meet the nitrogen supply demand is a problem that needs to be solved by the staff in this field. Summary of the Invention

[0005] The purpose of the present invention is to provide a nitrogen heating storage tank. Through the design combination of an inner storage tank and an outer storage tank, and in conjunction with the arrangement of a front heat exchanger and a rear heat exchanger, a certain space can be provided in the outer tank body for nitrogen storage. The front heat exchanger is used for the scenario of low-demand nitrogen use and also for the supply of nitrogen storage. The rear heat exchanger is used for the scenario of high-demand nitrogen use, meeting the use of various nitrogen demand amounts, avoiding increasing the load and required energy consumption of the heat exchanger, improving the service effect, service life and application range of the nitrogen heating storage tank, and meeting the use scenarios with large fluctuations in nitrogen demand.

[0006] To solve the above technical problems, the present invention is realized through the following technical solutions: The present invention is a nitrogen heating storage tank, including an outer tank body, a front heat exchanger, a rear heat exchanger, an inner storage tank and a manifold chamber; The inner storage tank is fixed inside the outer tank body and there is a spiral interlayer body between the inner storage tank and the outer tank body. A flow accumulation area is formed between the bottoms of the inner storage tank and the outer tank body; A core tube is provided at the axis of the inner storage tank. An annular partition layer is provided inside the inner storage tank to form a medium chamber and a gas storage chamber. A number of partition plates are provided in both the medium chamber and the gas storage chamber to respectively form a number of fan-shaped sub-medium chambers and sub-gas storage chambers; The bottom surface of the sub-medium chamber is provided with a bottom tube connected to the flow accumulation area. The bottom end of the core tube is connected to a gas inlet that penetrates the outer tank body; Heating rods are provided in the sub-medium chambers, and gas storage bags are provided in the sub-gas storage chambers. The tops of the gas storage bags are fixed with an inlet pipe and an outlet pipe that penetrate the inner storage tank; The confluence chamber is fixed at the tops of a number of intake pipes and outlet pipes. An inner confluence cavity and an outer confluence cavity are provided in the confluence chamber. The intake pipes and the outlet pipes are respectively communicated with the inner confluence cavity and the outer confluence cavity; The front heat exchanger and the rear heat exchanger are fixed at the top of the outer tank. The gas inlet of the front heat exchanger is connected to the top end of the core pipe through a first pipe body. A second pipe body connected to the inner confluence cavity is provided at the gas outlet of the front heat exchanger. A pre-exhaust is connected to the second pipe body through a three-way flow valve; The gas inlet of the rear heat exchanger is connected to the outer confluence cavity through a third pipe body. A post-exhaust connected to the pre-exhaust is provided at the gas outlet of the rear heat exchanger. An air pump is connected to the third pipe body; An upper confluence valve and a lower confluence valve are provided at the axis center inside the outer tank. Two liquid extraction pipes respectively connected to the upper confluence valve and the lower confluence valve are provided on each of the several sub-medium cavities; The medium inlets on the front heat exchanger and the rear heat exchanger are respectively connected to the upper confluence valve and the lower confluence valve through a pump body and a pipeline. The medium outlets of the front heat exchanger and the rear heat exchanger are respectively connected to the spiral interlayer through a liquid return pipe.

[0007] Further, mounting seats are embedded and fixed at the top and bottom of the air storage bag. The mounting seats are fixed on the inner top surface and the bottom surface of the sub-air storage cavity. The intake pipes and the outlet pipes are both arranged on the mounting seat at the top of the air storage bag.

[0008] Further, an inner breathing valve communicated with the sub-air storage cavity is provided at the top of the inner storage tank. The inner breathing valve is not communicated with the air storage bag. An outer breathing valve is provided at the top of the outer tank.

[0009] Further, the bottom end of the intake pipe is fixed to the mounting seat at the bottom of the air storage bag. A number of strip-shaped grooves are provided on the circumferential side of the bottom end of the intake pipe.

[0010] Further, one-way valves are provided on the bottom pipe, the liquid return pipe, the intake pipe and the outlet pipe. Electromagnetic on-off valves are provided on the liquid extraction pipe and the bottom pipe.

[0011] Further, a control device is further included. The control device includes a processor and a number of control units. The electromagnetic on-off valves, the three-way flow valve and the pump bodies on the front heat exchanger and the rear heat exchanger are all electrically connected to the processor.

[0012] Further, a pressure sensor is provided inside the air storage bag. A temperature sensor is provided inside the sub-medium cavity. The temperature sensor and the pressure sensor are both electrically connected to the processor.

[0013] Further, temperature probes are provided on the first pipe body, the second pipe body, the third pipe body and the post-exhaust. The temperature probes are electrically connected to the processor.

[0014] Further, a plurality of supporting feet are provided at the bottom of the outer tank body, and a plurality of elevation bodies are provided between the inner bottom surface of the outer tank body and the bottom of the inner storage tank. The flow accumulation area is formed by a plurality of elevation bodies.

[0015] Further, heat insulation cotton is provided on a plurality of pipe bodies located outside the outer tank body, and a heat insulation layer is wrapped around the peripheral side of the outer tank body.

[0016] The present invention has the following beneficial effects: 1. Through the design combination of the inner storage tank and the outer storage tank, and in cooperation with the arrangement of the front heat exchanger and the rear heat exchanger, the present invention can provide a certain space in the outer tank body for nitrogen storage. The front heat exchanger is used for the use scenario of low-demand nitrogen, and at the same time for the supply of nitrogen storage. The rear heat exchanger is used for the use scenario of high-demand nitrogen, meeting the use of various nitrogen demand amounts, avoiding increasing the load and required energy consumption of the heat exchanger, improving the use effect, service life and applicable range of the nitrogen heating storage tank, and meeting the use scenarios with large fluctuations in nitrogen demand.

[0017] 2. Through the medium flow in the spiral sandwich body, temperature insulation can be carried out outside the gas storage bag, and through the medium temperature in the sub-medium cavity, temperature insulation can be carried out inside the gas storage bag, ensuring that the nitrogen in the gas storage cavity is protected at a certain temperature, improving the nitrogen storage effect, and reducing the energy consumption and heat exchange time during subsequent reuse.

[0018] 3. Through the arrangement of the core pipe at the axis of the inner storage tank, a part of the medium temperature in the sub-medium cavity can be conducted to the core pipe for preheating after nitrogen is input, playing a role in reducing energy consumption and improving heat exchange efficiency.

[0019] 4. By designing a plurality of sub-medium cavities, the medium in each sub-medium cavity is separately temperature-controlled and heated, which is conducive to control, and the temperature ranges in the plurality of sub-medium cavities can be set in a stepped manner. The medium in the sub-medium cavity can be selected according to the nitrogen temperature, improving heat exchange efficiency and reducing the energy consumption problem caused by unified heating.

[0020] Of course, it is not necessary for any product implementing the present invention to achieve all the above advantages simultaneously. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0022] Figure 1 It is a schematic structural diagram of a nitrogen heating storage tank of the present invention; Figure 2 Structural schematic diagram after a part of the present invention is cut off; Figure 3 is Figure 2 partial enlarged view of the position A in; Figure 4 Structural schematic diagram after the outer tank body of the present invention is removed; Figure 5 Structural schematic diagram of the inner storage tank; Figure 6 Structural schematic diagram after a part of the inner storage tank is cut off; Figure 7 Structural sectional view of the inner storage tank; In the attached drawings, the list of components represented by each reference numeral is as follows: 1 - outer tank body, 2 - front heat exchanger, 3 - rear heat exchanger, 4 - inner storage tank, 5 - confluence chamber, 6 - spiral sandwich body, 7 - storage flow area, 8 - upper confluence valve, 9 - lower confluence valve, 10 - elevation body, 11 - support leg, 12 - outer breathing valve, 201 - first pipe body, 202 - second pipe body, 203 - three - way flow valve, 204 - pre - exhaust, 205 - return liquid pipe, 301 - third pipe body, 302 - post - exhaust, 401 - core pipe, 402 - annular partition layer, 403 - partition board, 404 - sub - medium chamber, 405 - sub - gas storage chamber, 406 - bottom pipe, 407 - gas inlet, 408 - heating rod, 409 - gas storage bag, 410 - intake pipe, 411 - outlet pipe, 412 - liquid extraction pipe, 413 - mounting seat, 414 - inner breathing valve, 501 - outer confluence chamber, 502 - inner confluence chamber. Specific embodiments

[0023] 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 making creative efforts belong to the scope of protection of the present invention.

[0024] Please refer to Figure 1-7 As shown, the present invention is a nitrogen heating storage tank, including an outer tank body 1, a front heat exchanger 2, a rear heat exchanger 3, an inner storage tank 4 and a confluence chamber 5; The inner storage tank 4 is fixed inside the outer tank body 1 and there is a spiral sandwich body 6 between the inner storage tank 4 and the outer tank body 1, and a storage flow area 7 is formed between the bottom of the inner storage tank 4 and the outer tank body 1; A core pipe 401 is provided at the axis of the inner storage tank 4, and an annular partition layer 402 is provided inside the inner storage tank 4 to form a medium chamber and a gas storage chamber. A plurality of partition boards 403 are provided in both the medium chamber and the gas storage chamber to respectively form a plurality of fan - shaped sub - medium chambers 404 and sub - gas storage chambers 405; A bottom pipe 406 connected to the current storage area 7 is provided at the bottom surface of the sub-medium cavity 404, and a gas inlet 407 penetrating through the outer tank body 1 is connected to the bottom end of the core pipe 401; A heating rod 408 is provided in the sub-medium cavity 404, an air storage bag 409 is provided in the sub-air storage cavity 405, and an air inlet pipe 410 and an air outlet pipe 411 penetrating through the inner storage tank 4 are fixed at the top of the air storage bag 409; The confluence chamber 5 is fixed at the top ends of a number of air inlet pipes 410 and air outlet pipes 411. An inner confluence cavity 502 and an outer confluence cavity 501 are provided in the confluence chamber 5, and the air inlet pipes 410 and the air outlet pipes 411 are respectively communicated with the inner confluence cavity 502 and the outer confluence cavity 501; The front heat exchanger 2 and the rear heat exchanger 3 are fixed at the top of the outer tank body 1. The gas inlet of the front heat exchanger 2 is connected to the top end of the core pipe 401 through a first pipe body 201. The gas outlet of the front heat exchanger 2 is provided with a second pipe body 202 connected to the inner confluence cavity 502, and a pre-exhaust 204 is connected to the second pipe body 202 through a three-way flow valve 203; The gas inlet of the rear heat exchanger 3 is connected to the outer confluence cavity 501 through a third pipe body 301. The gas outlet of the rear heat exchanger 3 is provided with a post-exhaust 302 connected to the pre-exhaust 204, and an air pump is connected to the third pipe body 301; An upper confluence valve 8 and a lower confluence valve 9 are provided at the axis center inside the outer tank body 1, and two liquid extraction pipes 412 respectively connected to the upper confluence valve 8 and the lower confluence valve 9 are provided on a number of sub-medium cavities 404; The medium inlets on the front heat exchanger 2 and the rear heat exchanger 3 are respectively connected to the upper confluence valve 8 and the lower confluence valve 9 through a pump body and a pipeline, and the medium outlets of the front heat exchanger 2 and the rear heat exchanger 3 are respectively connected to the spiral sandwich body 6 through a return liquid pipe 205.

[0025] Among them, as Figure 7 shown, mounting seats 413 are embedded and fixed at both the top and the bottom of the air storage bag 409. The mounting seats 413 are fixed on the inner top surface and the bottom surface of the sub-air storage cavity 405, and the air inlet pipe 410 and the air outlet pipe 411 are both arranged on the mounting seat 413 at the top of the air storage bag 409.

[0026] Among them, as Figure 1-2 and Figure 4-6 shown, an inner breathing valve 414 communicated with the sub-air storage cavity 405 is provided at the top of the inner storage tank 4. The inner breathing valve 414 is not communicated with the air storage bag 409, and an outer breathing valve 12 is provided at the top of the outer tank body 1.

[0027] Among them, as Figure 2 shown, the bottom end of the air inlet pipe 410 is fixed to the mounting seat 413 at the bottom of the air storage bag 409, and a number of strip-shaped grooves are provided on the circumferential side surface of the bottom end of the air inlet pipe 410.

[0028] Among them, one-way valves are provided on the bottom pipe 406 , the liquid return pipe 205 , the air inlet pipe 410 and the air outlet pipe 411 , and electromagnetic switch valves are provided on the liquid extraction pipe 412 and the bottom pipe 406 .

[0029] It also includes a control device, which includes a processor and several control units. Several electromagnetic switch valves, a three-way flow valve 203, and pump bodies on the front heat exchanger 2 and the rear heat exchanger 3 are electrically connected to the processor.

[0030] Among them, a pressure sensor is arranged in the air storage bag 409, and a temperature sensor is arranged in the medium chamber 404. Both the temperature sensor and the pressure sensor are electrically connected to the processor.

[0031] The first tube body 201 , the second tube body 202 , the third tube body 301 and the rear exhaust 302 are all provided with temperature probes, and the temperature probes are electrically connected to the processor.

[0032] Among them Figure 1-2 As shown, a plurality of legs 11 are provided at the bottom of the outer tank body 1 , a plurality of elevation bodies 10 are provided between the inner bottom surface of the outer tank body 1 and the bottom of the inner storage tank 4 , and the flow storage area 7 is formed by the plurality of elevation bodies 10 .

[0033] Among them, several tubes located outside the outer tank body 1 are provided with heat insulation cotton, and the side surface of the outer tank body 1 is wrapped with a heat insulation layer.

[0034] The medium temperature in the sub-medium cavity 404 is maintained in different temperature ranges and arranged in a step-like manner.

[0035] The working principle of the present invention is: When the nitrogen demand is equivalent to the heating and heat exchange efficiency of the front heat exchanger 2, the nitrogen is input into the core tube 401 through the gas inlet 407, and is preheated in the core tube 401 by the medium temperature in the medium chamber 404. The preheated nitrogen is input into the front heat exchanger 2 through the first tube body 201 for heat exchange. The temperature can be detected by the temperature probe at the first tube body 201, and the medium chamber 404 of the required temperature is selected according to the required power. The electromagnetic switch valves on the corresponding liquid extraction pipe 412 and the bottom pipe 406 are opened, and the medium of the medium chamber 404 is extracted by the pump body on the front heat exchanger 2 and input into the front heat exchanger 2 for heat exchange. The heated nitrogen is directly output by the second tube body 202 and the front exhaust 204 for use. The medium used in the front heat exchanger 2 is discharged to the spiral sandwich body 6 through the return pipe 205 and flows to the storage area 7, and flows back to the medium chamber 404 through the pressure in the medium chamber 404 and the bottom pipe 406.

[0036] When the nitrogen demand is less than the heating and heat exchange efficiency of the pre-heat exchanger 2, nitrogen is input from the gas inlet 407 into the core tube 401 for preheating, then through the pre-heat exchanger 2 for heat exchange and heating, and then through the three-way flow valve 203 for splitting. One part is output through the second tube body 202 and the pre-exhaust 204, and the other part is input into the internal confluence chamber 502 through the second tube body 202 and discharged into each storage airbag 409 through the internal confluence chamber 502 and the inlet pipe 410. During storage, heat insulation is carried out through the spiral sandwich body 6 on the outside and temperature insulation exists through the medium separation chamber 404 on the inside to ensure the storage temperature. When the pressure in the storage airbag 409 is too high, it indicates that the storage is full, and the nitrogen input is stopped.

[0037] When the nitrogen demand is greater than the heating and heat exchange efficiency of the pre-heat exchanger 2, nitrogen is input from the gas inlet 407 into the core tube 401 for heat exchange and then directly output through the second tube body 202 and the pre-exhaust 204. The connection between the second tube body 202 and the internal confluence chamber 502 is cut off. Synchronously, the nitrogen in the storage airbag 409 and the confluence chamber 5 is pumped by the air pump on the third tube body 301, and the nitrogen with a certain temperature is input into the post-heat exchanger 3. After heat exchange through the post-heat exchanger 3, it is output through the post-exhaust 302. The pre-heat exchanger 2 and the post-heat exchanger 3 work synchronously to output heated nitrogen at the same time. If the nitrogen in the storage airbag 409 is used up, the work of the post-heat exchanger 3 is stopped, the nitrogen delivery speed at the nitrogen inlet 407 is increased, and the medium circulation speed of the pre-heat exchanger 2 is increased to meet the nitrogen demand by increasing the load.

[0038] In the description of this specification, the description with reference to terms such as "one embodiment", "example", "specific example", etc. means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0039] The preferred embodiments of the present invention disclosed above are only used to help illustrate the present invention. The preferred embodiments do not describe all the details in detail, nor limit the invention to the specific embodiments described. Obviously, according to the content of this specification, many modifications and changes can be made. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of the present invention, so that those skilled in the art can understand and utilize the present invention well. The present invention is only limited by the claims and their full scope and equivalents.

Claims

1. A nitrogen heating storage tank, characterized in that: It comprises an outer tank body (1), a front heat exchanger (2), a rear heat exchanger (3), an inner storage tank (4) and a confluence chamber (5); The inner storage tank (4) is fixed inside the outer tank body (1) and a spiral interlayer body (6) is provided between the inner storage tank (4) and the outer tank body (1), and a flow storage area (7) is formed between the bottom of the inner storage tank (4) and the outer tank body (1); The inner storage tank (4) is provided with a core tube (401) at the axis center, the inner storage tank (4) is provided with an annular partition (402) to form a medium chamber and an air storage chamber, the medium chamber and the air storage chamber are both provided with a plurality of partitions (403) to form a plurality of fan-shaped sub-medium chambers (404) and sub-air storage chambers (405); The bottom surface of the medium-dividing cavity (404) is provided with a bottom tube (406) connected to the flow storage area (7); the bottom end of the core tube (401) is connected to a gas inlet (407) penetrating the outer tank body (1); A heating rod (408) is provided in the sub-medium cavity (404), an air storage bag (409) is provided in the sub-air storage cavity (405), and an air inlet pipe (410) and an air outlet pipe (411) penetrating the inner storage tank (4) are fixed to the top of the air storage bag (409); The confluence chamber (5) is fixed to the top ends of a plurality of air inlet pipes (410) and air outlet pipes (411); an inner confluence chamber (502) and an outer confluence chamber (501) are provided in the confluence chamber (5); the air inlet pipe (410) and the air outlet pipe (411) are respectively connected to the inner confluence chamber (502) and the outer confluence chamber (501); The front heat exchanger (2) and the rear heat exchanger (3) are fixed on the top of the outer tank body (1); the gas inlet of the front heat exchanger (2) is connected to the top of the core tube (401) through the first tube body (201); the gas outlet of the front heat exchanger (2) is provided with a second tube body (202) connected to the inner confluence cavity (502); the second tube body (202) is connected to a front exhaust (204) through a three-way flow valve (203); The gas inlet of the rear heat exchanger (3) is connected to the external flow chamber (501) through the third pipe body (301), the gas outlet of the rear heat exchanger (3) is provided with a rear exhaust (302) connected to the front exhaust (204), and the third pipe body (301) is connected to an air pump; An upper confluence valve (8) and a lower confluence valve (9) are provided at the inner axis of the outer tank body (1), and two liquid extraction pipes (412) respectively connected to the upper confluence valve (8) and the lower confluence valve (9) are provided on each of the plurality of medium sub-cavities (404); The medium inlets on the front heat exchanger (2) and the rear heat exchanger (3) are connected to the upper confluence valve (8) and the lower confluence valve (9) respectively through a pump body and a pipeline, and the medium outlets of the front heat exchanger (2) and the rear heat exchanger (3) are connected to the spiral sandwich body (6) respectively through a liquid return pipe (205).

2. A nitrogen heating storage tank according to claim 1, characterized in that: The top and bottom of the air storage bag (409) are both embedded with mounting seats (413), the mounting seats (413) are fixed to the top and bottom surfaces of the air storage cavity (405), and the air inlet pipe (410) and the air outlet pipe (411) are both arranged on the mounting seats (413) at the top of the air storage bag (409).

3. A nitrogen heating storage tank according to claim 1, characterized in that: An inner breathing valve (414) communicating with the sub-storage air chamber (405) is provided on the top of the inner storage tank (4); the inner breathing valve (414) and the air storage bag (409) are not connected to each other; and an outer breathing valve (12) is provided on the top of the outer tank body (1).

4. A nitrogen heating storage tank according to claim 2, characterized in that: The bottom end of the air intake pipe (410) is fixed to a mounting seat (413) at the bottom of the air storage bag (409), and a plurality of strip-shaped grooves are provided on the peripheral side surface of the bottom end of the air intake pipe (410).

5. A nitrogen heating storage tank according to claim 1, characterized in that: The bottom pipe (406), the liquid return pipe (205), the air inlet pipe (410) and the air outlet pipe (411) are all provided with one-way valves, and the liquid extraction pipe (412) and the bottom pipe (406) are all provided with electromagnetic switch valves.

6. A nitrogen heating storage tank according to claim 5, characterized in that: It also includes a control device, which includes a processor and a plurality of control units, and the plurality of electromagnetic switch valves, the three-way flow valve (203), the pump bodies on the front heat exchanger (2) and the rear heat exchanger (3) are all electrically connected to the processor.

7. A nitrogen heating storage tank according to claim 6, characterized in that: A pressure sensor is provided in the air storage bag (409), and a temperature sensor is provided in the medium sub-cavity (404); both the temperature sensor and the pressure sensor are electrically connected to the processor.

8. A nitrogen heating storage tank according to claim 7, characterized in that: The first tube body (201), the second tube body (202), the third tube body (301) and the rear exhaust (302) are all provided with temperature probes, and the temperature probes are electrically connected to the processor.

9. The nitrogen heating storage tank according to claim 1, characterized in that: The bottom of the outer tank body (1) is provided with a plurality of supporting legs (11), a plurality of raising bodies (10) are provided between the inner bottom surface of the outer tank body (1) and the bottom of the inner storage tank (4), and the flow storage area (7) is formed by the plurality of raising bodies (10).

10. The nitrogen heating storage tank according to claim 1, characterized in that: A plurality of tubes located outside the outer tank body (1) are provided with heat insulation cotton, and the outer side surface of the outer tank body (1) is wrapped with a heat insulation layer.

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