CN215981961U - Polygonal dry-type hydrogen cabinet - Google Patents

Abstract

The utility model belongs to the field of hydrogen storage engineering, and relates to a polygonal dry-type hydrogen tank which comprises a tank body consisting of a stand column, a bottom plate, a side plate and a tank top, wherein a bottom oil groove, a piston sealing device and a piston steel structure are arranged in the tank body, the bottom oil groove surrounds the outside of the bottom plate and is positioned between the inner wall of the side plate and the bottom plate, the piston sealing device surrounds the outside of the piston steel structure and is positioned between the inner wall of the side plate and the piston steel structure, a hydrogen region between the bottom plate and the piston steel structure is externally connected with a hydrogen inlet and outlet pipe and an emptying device, the hydrogen inlet and outlet pipe penetrates through the bottom plate, the emptying device penetrates through the side plate, and a connector of the emptying device is slightly lower than the bottom position of the piston sealing device when the piston steel structure falls to the bottom. The polygonal dry-type hydrogen cabinet well solves the problem of low-pressure storage of hydrogen in large-scale and nearby industrial application.

Description

Polygonal dry-type hydrogen cabinet

Technical Field

The utility model belongs to the field of hydrogen storage engineering, and particularly relates to a polygonal dry-type hydrogen cabinet, which is used for meeting the requirement of large-scale nearby industrial application of hydrogen.

Background

Under the large background of global reduction of carbon emission, a novel alternative energy is called for. Hydrogen energy is an efficient and clean energy source and a high-quality reducing agent, and with the development of hydrogen and the expansion of the application field, the large-scale application of hydrogen in the traditional industrial field becomes the leading edge of research. Taking a traditional steel united enterprise as an example: the traditional blast furnace ironmaking adopts coke to provide heat and a reducing agent, the carbon emission is very high, and if part or all of the blast furnace ironmaking process can adopt hydrogen as the reducing agent, the carbon emission is greatly reduced; in steel plants, various furnaces and kilns use hydrogen gas of about 10kpa pressure as fuel. Meanwhile, under the background of large-scale utilization of wind energy and solar energy, if the intermittent and unstable new energy is made into hydrogen by adopting modes of electrolyzing water and the like for storage and adopts a low-pressure storage mode, the hydrogen demand of continuous production of each branch plant of iron and steel combination enterprises such as iron making, various furnaces and the like is met nearby, and the effect of reducing carbon emission of the traditional iron and steel combination enterprises is obvious. However, cryogenic liquid storage and high pressure storage of hydrogen have been studied, but low pressure storage of hydrogen is currently limited to wet chest storage. The wet cabinet application technology has the following defects: 1) the gas storage pressure is about 3 kpa; 2) the adopted water seal can humidify the hydrogen; 3) the large-scale foundation load is very large; 4) the energy is wasted in the anti-freezing problem in the north. Therefore, there is a need for a dry hydrogen tank for low-pressure storage of hydrogen, which provides a solution for low-pressure storage of hydrogen for large-scale industrial application of hydrogen.

SUMMERY OF THE UTILITY MODEL

In view of the above, the present invention provides a polygonal dry-type hydrogen cabinet, which aims to solve the problem of low-pressure storage in large-scale and near-industrial application of hydrogen.

In order to achieve the purpose, the utility model provides the following technical scheme:

the polygon dry type hydrogen cabinet has the working principle that: the gas storage pressure is automatically generated by the piston mass, the piston steel structure adopts the form of a piston truss and a flat-bottom piston plate to seal hydrogen, and a piston oil groove installation piston sealing device is formed between a piston oil groove baffle plate at the periphery of the piston and the inner wall of the side plate so as to realize the movable connection between the piston and the side plate and seal the hydrogen.

This polygon dry-type hydrogen cabinet, include by the stand, the bottom plate, the curb plate, the cabinet body that the cabinet top is constituteed, the internal bottom oil drain that is equipped with of cabinet, piston sealing device and piston steel construction, bottom oil drain encircles outside the bottom plate and lies in between curb plate inner wall and the bottom oil drain baffle, piston sealing device encircles outside the piston steel construction and lies in between curb plate inner wall and the piston steel construction, hydrogen district between bottom plate and the piston steel construction is external to have hydrogen inlet and outlet pipe and emptying devices, hydrogen inlet and outlet pipe runs through in the bottom plate, emptying devices runs through in the curb plate, and emptying devices's interface is less than piston sealing device bottom position when the piston steel construction falls the end slightly.

Optionally, the emptying device comprises a remote control quick-opening valve, a vertical pipe, an emptying port platform, a flame arrester, a weather cap and an explosion-proof industrial television, the vertical pipe is arranged along the height direction of the cabinet body, one end of the vertical pipe is connected to a hydrogen region between the bottom plate and the piston steel structure through the remote control quick-opening valve, and the other end of the vertical pipe is higher than the top of the cabinet and is provided with the emptying port platform, the flame arrester, the weather cap and the explosion-proof industrial television.

Optionally, a ventilation building is arranged on the cabinet top, an internal explosion-proof cage and a hand-operated emergency rescue hanging bag which are mutually independent are arranged on the ventilation building, the internal explosion-proof cage consists of a winding drum mechanism and a hanging cage, and the hanging cage is connected to the winding drum mechanism.

Optionally, the bottom oil drain is an internal space surrounded by a bottom oil drain baffle, an inner wall of the side plate and a bottom plate between the bottom oil drain baffle and the inner wall of the side plate, and is used for collecting gas condensate water condensed from sealing oil of the piston sealing device and the side plate, and a bottom oil drain heating facility is arranged in an oil drain water layer below the bottom oil drain sealing oil according to climatic conditions.

Optionally, a piston support used for supporting the piston steel structure during bottom falling is further arranged in the cabinet body, and cabinet body galleries are arranged on the side plates.

Optionally, the piston steel structure comprises a piston middle bottom plate, a piston horizontal girder is arranged on the piston middle bottom plate, a piston truss is arranged on the piston horizontal girder, and a piston guide wheel moving up and down along the inner wall of the side plate, a piston oil groove baffle matched with the piston sealing device and a piston anti-rotation device are arranged on the piston truss.

Optionally, the piston steel structure still includes the piston horizontal shrouding of surrounding in the piston middle part bottom plate outside, and piston oil groove baffle sets up on piston horizontal shrouding, still is equipped with piston lower part space sampling tube on the piston horizontal shrouding.

Optionally, the piston sealing device includes a spring pressing sheet and piston oil gallery sealing oil, the spring pressing sheet is mounted on the piston oil gallery baffle and pressed against the inner wall of the side plate, the piston oil gallery sealing oil is arranged between the piston oil gallery baffle and the inner wall of the side plate, and a piston oil gallery heating facility is arranged in the piston oil gallery sealing oil according to climatic conditions.

Optionally, a replacement diffusion pipe and/or a sampling pipe are further externally connected to the hydrogen region between the bottom plate and the piston steel structure, the replacement diffusion pipe or the sampling pipe penetrates through the side plate, and an interface of the replacement diffusion pipe and/or the sampling pipe is slightly lower than the bottom of the piston sealing device when the piston steel structure falls to the bottom.

Optionally, the gas storage pressure of the cabinet body is 2-15 kPa.

By adopting the scheme, the piston sealing device for realizing movable sealing of the piston and the side plate is arranged at the periphery of the piston, the piston sealing device compresses the thin plate through the spring and fills a thin oil structure with a certain height to realize anhydrous sealing and ensure sealing safety, and after oil water in the oil groove at the bottom enters the oil-water separator on the ground for oil-water separation, the sealing oil is pumped to the upper part of the side plate through the circulating oil pump station and naturally overflows from the inner wall of the side plate to flow down to the piston oil groove to ensure the sealing oil; a guide wheel and an anti-rotation device are arranged between the piston and the side plate to realize vertical up-and-down movement of the piston relative to the side plate and automatic hydrogen handling; the static pressure generated by the height of the oil level above the spring pressing thin plate of the piston sealing device is matched with the pressing force of the spring, and then the hydrogen can be reliably sealed.

The utility model has the beneficial effects that:

1. the polygonal dry-type hydrogen tank has the gas storage pressure greatly improved than that of a wet-type tank, and can reach 15kPa, so that a user using hydrogen as fuel within a range of several kilometers around can obtain continuous and stable hydrogen supply.

2. The polygonal dry type hydrogen cabinet does not humidify hydrogen because water is not used as a sealing medium, and is a dry type cabinet compared with a wet type cabinet which uses water as a sealing medium.

3. According to the polygonal dry-type hydrogen cabinet, the emptying device is configured, and the fire damper is arranged at the outlet of the emptying vertical pipe, so that hydrogen in the cabinet can be quickly emptied during an accident of the hydrogen cabinet, and the accident expansion is avoided; in order to prevent foreign matters from entering, a weather cap is arranged; and in order to monitor the working state of the emptied riser outlet equipment, an industrial television monitor with an image recognition function is configured for the vertical riser outlet equipment, and an alarm is given to a manned place.

4. In the polygonal dry-type hydrogen cabinet, in order to realize convenient hydrogen purging and replacement, the bottom plate of the piston steel structure adopts a flat plate reinforcement mode, and the piston plate is reinforced on the air side of the side plate of the cabinet body; the piston horizontal sealing plate between the piston oil groove baffle on the periphery of the piston and the flat bottom plate in the middle of the piston is high in position, and the sampling tube is arranged on the piston horizontal sealing plate, so that the replacement condition of the lower part of the piston can be sampled and checked.

5. The polygonal dry hydrogen tank is convenient for replacement purging by connecting the emptying device and the replacement diffusing pipe interface from the height of the piston sealing device which is slightly lower than the piston falling bottom position. It should be noted that, in the case of replacement of the hydrogen tank, if a replacement method of releasing the mixed gas by using a piston to repeatedly lift and lower through an emptying device is adopted, the replacement and release pipe on the tank body can be replaced by a sampling pipe on the tank body.

6. The valve on the sampling tube in the space under the piston is connected by the tube thread adopting the thread seal, and the tube opening is provided with the tube thread plug adopting the thread seal, so as to ensure the safe cut-off.

Additional advantages, objects, and features of the utility model will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the utility model. The objectives and other advantages of the utility model may be realized and attained by the means of the instrumentalities and combinations particularly pointed out hereinafter.

Drawings

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be further described in detail with reference to the accompanying drawings, in which:

FIG. 1 is a schematic diagram of a hydrogen cabinet according to the preferred embodiment of the present invention;

reference numerals: 1 is a hydrogen cabinet body; 2 is a column; 3 is a hydrogen inlet pipe and a hydrogen outlet pipe; 4 is a bottom plate; 5 is a bottom oil ditch, 5-1 is a bottom oil ditch baffle, 5-2 is bottom oil ditch sealing oil, 5-3 is an oil ditch water layer, and 5-4 is a bottom oil ditch heating facility; 6 is a piston bracket; 7 is a replacement diffusion pipe; 8 is a piston sealing device, 8-1 is a spring pressing thin plate, 8-2 is piston oil groove sealing oil, and 8-3 is a piston oil groove heating facility; 9 is a piston steel structure, 9-1 is a piston middle bottom plate, 9-2 is a piston horizontal girder, 9-3 is a piston horizontal sealing plate, 9-4 is a piston guide wheel, 9-5 is a piston anti-rotation device, 9-6 is a piston truss, 9-7 is a piston lower space sampling tube, and 9-8 is a piston oil groove baffle plate; 10 is cabinet body corridor; 11 is a side plate; 12 is a cabinet top; 13 is a ventilation clerestory; 14 is an internal explosion-proof suspension cage, 14-1 is a winding drum mechanism, and 14-2 is a suspension cage; 15, a hand-operated emergency rescue hanging bag; 16 is an emptying device, 16-1 is a remote control quick-opening valve, 16-2 is a vertical pipe, 16-3 is an emptying port platform, 16-4 is a flame arrester, 16-5 is a windproof and rainproof cap, and 16-6 is an explosion-proof industrial television; s is the piston stroke, a is the air zone, H is the hydrogen zone, D is the diameter of the circumcircle of the inner wall of the side plate, and D is the diameter of the inscribed circle of the inner wall of the side plate.

Detailed Description

The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and effects of the present invention will be easily understood by those skilled in the art from the disclosure of the present specification. The utility model is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention. It should be noted that the drawings provided in the following embodiments are only for illustrating the basic idea of the present invention in a schematic way, and the features in the following embodiments and examples may be combined with each other without conflict.

Wherein the showings are for the purpose of illustrating the utility model only and not for the purpose of limiting the same, and in which there is shown by way of illustration only and not in the drawings in which there is no intention to limit the utility model thereto; to better illustrate the embodiments of the present invention, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.

Referring to fig. 1, the polygonal dry-type hydrogen tank of the present embodiment includes a tank body 1, the tank body 1 is composed of an upright column 2, a bottom plate 4, a side plate 11, a tank top 12, a piston steel structure 9, a piston sealing device 8, and the like, wherein the upright column 2 surrounds the bottom plate 4, the side plate 11 is disposed on the upright column 2 to form a polygonal structure, the tank top 12 is disposed right above the bottom plate 4, so that a polygonal hydrogen tank is formed, and in addition, a tank body corridor 10 for maintaining and walking and reinforcing ribs are disposed on an outer wall of the side plate 11. And a bottom oil groove 5, a piston sealing device 8 and a piston steel structure 9 are arranged in the cabinet body 1, the bottom oil groove 5 is an inner space between the inner wall of the side plate 11 and the bottom oil groove baffle 5-1 on the upper edge of the bottom plate 4, the piston sealing device 8 surrounds the piston steel structure 9 and is positioned between the inner wall of the side plate 11 and the piston steel structure 9, a hydrogen region H between the bottom plate 4 and the piston steel structure 9 is externally connected with a hydrogen inlet and outlet pipe 3 and an emptying device 16, the hydrogen inlet and outlet pipe 3 penetrates through the bottom plate 4, the emptying device 16 penetrates through the side plate 11, and the interface of the emptying device 16 is slightly lower than the bottom of the piston sealing device 8 when the piston steel structure 9 falls to the bottom. In addition, an air area a is arranged between the piston steel structure 9 and the cabinet top 12, the height between the bottom plate 4 and the cabinet top 12 is a piston stroke S, and the diameters of the inner circle and the outer circle of the inner wall of the side plate are D and D respectively.

Specifically, the emptying device 16 comprises a remote control quick-opening valve 16-1, a vertical pipe 16-2, an emptying port platform 16-3, a flame arrester 16-4, a weather-proof cap 16-5 and an explosion-proof industrial television 16-6, wherein the vertical pipe 16-2 is arranged along the height direction of the cabinet body 1, one end of the vertical pipe is connected to a hydrogen region H between the bottom plate 4 and the piston steel structure 9 through the remote control quick-opening valve 16-1, the other end of the vertical pipe is higher than the cabinet top 12, and the emptying port platform 16-3, the flame arrester 16-4, the weather-proof cap 16-5 and the explosion-proof industrial television 16-6 are arranged on the vertical pipe. The bottom oil groove 5 is an internal space enclosed by a bottom oil groove baffle 5-1, a side plate 11 with the same height as the bottom oil groove baffle 5-1 and a bottom plate 4 positioned between the bottom oil groove baffle and the side plate, bottom oil groove sealing oil 5-2, an oil groove water layer 5-3 and a bottom oil groove heating facility 5-4 are arranged in the internal space, and sealing oil leaked from the piston sealing device and coal gas condensate water condensed on the side plate flow into the bottom oil groove 5. The piston steel structure 9 consists of a piston middle bottom plate 9-1, a piston horizontal girder 9-2, a piston guide wheel 9-4, a piston anti-rotation device 9-5, a piston truss 9-6 and a piston oil groove baffle plate 9-8, wherein the piston horizontal girder 9-2 is arranged on the piston middle bottom plate 9-1, the piston truss 9-6 is arranged on the piston horizontal girder 9-2, the piston guide wheel 9-4 which is in sliding fit with the inner wall of the side plate 11, the piston oil groove baffle plate 9-8 which is adapted to the piston sealing device 8 and the piston anti-rotation device 9-5 are arranged on the piston truss 9-6, the piston steel structure 9 is provided with a piston horizontal sealing plate 9-3 which is arranged around the outer side of the piston middle bottom plate 9-1, and the piston oil groove baffle plate 9-8 is arranged on the piston horizontal sealing plate 9-3, the piston horizontal closing plate 9-3 is also provided with a piston lower space sampling tube 9-7, which is convenient for replacement and sampling of hydrogen with low density. The piston sealing device 8 is composed of a spring pressing thin plate 8-1, piston oil groove sealing oil 8-2 and a piston oil groove heating facility 8-3, the spring pressing thin plate 8-1 is installed on a piston oil groove baffle 9-8 and is pressed against the inner wall of the side plate 11, the piston oil groove sealing oil 8-2 is arranged between the piston oil groove baffle 9-8 and the inner wall of the side plate 11, and the piston oil groove heating facility 8-3 is arranged in the piston oil groove sealing oil 8-2. The bottom oil groove heating device 5-4 of the hydrogen tank and the piston oil groove heating device 8-3 are only used in northern cold areas.

Thus, the hydrogen cabinet piston sealing device 8 adopts thin oil sealing, and does not humidify hydrogen, so the hydrogen cabinet is a dry type hydrogen cabinet. The piston is integrally composed of a piston sealing device 8 and a piston steel structure 9, the gas storage pressure of hydrogen is automatically generated by the weight of the piston, when the hydrogen production and consumption are unbalanced, the piston of the hydrogen cabinet automatically moves vertically in the cabinet body 1 with the polygonal horizontal section formed by the upright post 3, the side plate 11 and the reinforcement ribs to deliver the hydrogen, the vertical movement of the piston is ensured by the close and force-applying fit of the piston guide wheel 9-4, the piston anti-rotation device 9-5 and the upright post 2, and the cabinet body sealing surface with the regular polygonal horizontal section and the piston sealing device 8 form movable piston sealing. Piston sealing device 8 adopts the spring to compress tightly the seal structure that the sheet metal pastes tight curb plate 11+ thin oil liquid column height: after oil and water in the bottom oil groove naturally overflow and enter an oil-water separator on the ground for oil-water separation, water is automatically discharged out of a hydrogen tank, qualified sealing oil is pumped to the upper part of the side plate 11 through a circulating oil pump station and naturally overflows from the inner wall of the side plate 11 to the piston oil groove; in addition, a spare oil tank is arranged at the high position of the side plate 11 and is used for storing spare oil, so that the oil level of the piston is guaranteed when power is off, the piston sealing device 8 is safe and reliable as long as the oil level of the piston oil groove is enough, and the movable sealing on the periphery of the piston is safe and reliable and convenient to check. Although the diameter of polygon hydrogen gas cabinet is tens of meters of magnitude, adopt different thick, add muscle and stand section, hydrogen pressure also can reach 2 ~ 15kpa under the piston, need to point out: the figure shows the piston stroke S in the normal operating state. Because the hydrogen is dangerous, the hydrogen cabinet is provided with an emptying device 16, a vertical pipe 16-2 of the emptying device 16 is connected out from a side plate 11 of the upper cabinet body 1 at a height slightly lower than the piston sealing device 8 at the bottom of the piston steel structure 9, and under the accident condition of the hydrogen cabinet, a remote control quick-opening valve 16-1 is opened remotely or manually so as to lead the hydrogen to be emptied above the cabinet top 12, thereby avoiding the accident expansion; in order to prevent lightning strike from being ignited, a fire damper 16-4 and a windproof and rainproof cap 16-5 are arranged at the pipe orifice of the vertical pipe, and a vent platform 16-3 is correspondingly arranged for overhauling and maintaining; and also for monitoring the working state of the riser 16-2 outlet equipment of the emptying device 16, an explosion-proof industrial television 16-6 with an image recognition function is configured for the device and alarms to a person on duty.

The piston horizontal sealing plate 9-3 in this embodiment not only seals the hydrogen gas, but also supports the piston oil gallery baffle plate 9-8, so that it is higher than the lowest position of the piston middle bottom plate 9-1 and the piston oil gallery baffle plate 9-8. The valves of the sampling pipes 9-7 at the lower part of the piston arranged on the hydrogen cabinet are connected by adopting thread-sealed pipe threads, and the pipe orifice is provided with a pipe thread pipe plug adopting thread sealing, so that the safe cut-off is ensured, and the characteristics of low and wide hydrogen explosion limit and the like are adapted.

The bottom oil groove heating device 5-3 and the piston oil groove heating device 8-3 of the hydrogen tank in the embodiment are only used in northern cold regions.

The cabinet top 12 in this embodiment is provided with a ventilation clerestory 13, the ventilation clerestory 13 is provided with an internal explosion-proof cage 14 and a hand-operated emergency rescue hanging bag 15 which are independent of each other, the internal explosion-proof cage 14 can be conveniently maintained and replaced for inspection personnel to enter and exit a piston and to be emergently evacuated, and the hand-operated emergency rescue hanging bag 15 can ensure that the personnel can safely evacuate the piston under the condition of power failure. The internal explosion-proof cage 14 is composed of a drum mechanism 14-1 and a cage 14-2, and the cage 14-2 is connected to the drum mechanism 14-1. And a piston bracket 6 used for supporting the piston steel structure 9 when falling to the bottom is also arranged in the cabinet body 1 so as to ensure that the piston steel structure 9 works smoothly.

In another embodiment, the hydrogen region H between the bottom plate 4 and the piston steel structure 9 is further externally connected with a replacement diffusion pipe 7, the replacement diffusion pipe 7 penetrates through the side plate 11, and the interface of the replacement diffusion pipe 7 is slightly lower than the bottom of the piston sealing device 8 when the piston steel structure 9 falls to the bottom. The replacement and purging work can be carried out on the hydrogen region H in the cabinet body through the replacement and diffusion pipe 7. To facilitate displacement and sampling of the assay displacement results. In addition, if the replacement of the hydrogen tank adopts a replacement method that the piston repeatedly ascends and descends to diffuse the mixed gas through the vent pipe, the vent device 16 can replace the replacement diffusion pipe 7, and the replacement diffusion pipe 7 can also be replaced by a sampling pipe arranged on the side plate.

Finally, the above embodiments are only intended to illustrate the technical solutions of the present invention and not to limit the present invention, and although the present invention has been described in detail with reference to the preferred embodiments, it will be understood by those skilled in the art that modifications or equivalent substitutions may be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions, and all of them should be covered by the claims of the present invention.

Claims (10)

1. The utility model provides a polygon dry-type hydrogen cabinet, includes the cabinet body of constituteing by stand, bottom plate, curb plate, cabinet top, its characterized in that: the internal bottom oil drain that is equipped with of cabinet, piston sealing device and piston steel construction, the bottom oil drain encircles outside the bottom plate and is located the bottom plate between curb plate inner wall and the bottom oil drain baffle, piston sealing device encircles outside the piston steel construction and is located between curb plate inner wall and the piston steel construction, hydrogen between bottom plate and the piston steel construction is distinguished to be external to have hydrogen inlet and outlet pipe and emptying devices, hydrogen inlet and outlet pipe runs through in the bottom plate, emptying devices runs through in the curb plate, and emptying devices's interface is less than piston sealing device bottom position when the piston steel construction falls the end slightly.

2. The polygonal dry hydrogen cabinet according to claim 1, wherein: the emptying device comprises a remote control quick-opening valve, a vertical pipe, an emptying port platform, a flame arrester, a wind and rain prevention cap and an explosion-proof industrial television, wherein the vertical pipe is arranged along the height direction of the cabinet body, one end of the vertical pipe is connected to a hydrogen region between the bottom plate and the piston steel structure through the remote control quick-opening valve, and the other end of the vertical pipe is higher than the top of the cabinet and is provided with the emptying port platform, the flame arrester, the wind and rain prevention cap and the explosion-proof industrial television.

3. The polygonal dry hydrogen cabinet according to claim 1, wherein: the cabinet top is provided with a ventilation building, the ventilation building is provided with an internal explosion-proof cage and a hand-operated emergency rescue hanging bag which are mutually independent, the internal explosion-proof cage consists of a winding drum mechanism and a hanging cage, and the hanging cage is connected to the winding drum mechanism.

4. The polygonal dry hydrogen cabinet according to claim 1, wherein: the bottom oil drain is composed of a bottom oil drain baffle, bottom oil drain sealing oil, an oil drain water layer and a side plate located above the periphery of the bottom plate, the bottom oil drain sealing oil and the oil drain water layer are located between the inner wall of the side plate and the bottom oil drain baffle, and a bottom oil drain heating facility is arranged in the oil drain water layer according to climatic conditions.

5. The polygonal dry hydrogen cabinet according to claim 1, wherein: the cabinet body is also internally provided with a piston support used for supporting the piston steel structure when the piston steel structure falls to the bottom, and the side plates are provided with cabinet body galleries.

6. The polygonal dry hydrogen cabinet according to claim 1, wherein: the piston steel structure comprises a piston middle bottom plate, a piston horizontal girder is arranged on the piston middle bottom plate, a piston truss is arranged on the piston horizontal girder, and a piston guide wheel moving up and down along the inner wall of the side plate, a piston oil groove baffle matched with the piston sealing device and a piston anti-rotation device are arranged on the piston truss.

7. The polygonal dry hydrogen cabinet according to claim 6, wherein: the piston steel structure still includes the piston horizontal shrouding that encircles in the piston middle part bottom plate outside, and piston oil groove baffle sets up on piston horizontal shrouding, still is equipped with piston lower part space sampling tube on the piston horizontal shrouding.

8. The polygonal dry hydrogen cabinet according to claim 6, wherein: the piston sealing device comprises a spring pressing thin plate and piston oil groove sealing oil, the spring pressing thin plate is installed on a piston oil groove baffle and pressed against the inner wall of the side plate, the piston oil groove sealing oil is arranged between the piston oil groove baffle and the inner wall of the side plate, and a piston oil groove heating facility is arranged in the piston oil groove sealing oil according to climatic conditions.

9. The polygonal dry hydrogen cabinet according to claim 1, wherein: the device also comprises a replacement diffusing pipe and/or a sampling pipe which is connected out of a side plate below the piston sealing device which is slightly lower than the falling bottom position of the piston steel structure.

10. The polygonal dry hydrogen cabinet according to claim 1, wherein: the gas storage pressure of the cabinet body is 2-15 kPa.

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