Novel large-volume high-pressure hydrogen storage container

Abstract

The utility model relates to the field of hydrogen storage, in particular to a novel large-volume hydrogen storage container. The container comprises a middle cylinder, a hemispherical upper / right seal head and a hemispherical lower / left seal head, is welded to form a cylindrical container with a single-layer plate structure, can be vertically or horizontally mounted and is provided with a skirt or a saddle. The container is provided with various pipe openings, a specific connecting and sealing mode is adopted, a pressure-bearing welding seam is of a full penetration welding butt welding structure, a main body material is low-temperature carbon steel, the container is suitable for a certain temperature, pressure and diameter range, and the sealing performance is ensured through a helium leak detection test. According to the development method, design, material selection and performance verification and welding process verification are subjected to integrated coupling iteration, and the intrinsic safety of the container is guaranteed through the steps of preliminary design, performance testing, optimization design, manufacturing and machining, test piece testing and the like. The hydrogen storage container is simple in structure, low in cost, wide in application range, capable of effectively overcoming the defects of an existing hydrogen storage container and capable of meeting the large-scale hydrogen storage requirement.

Description

TECHNICAL FIELD

[0001] The utility model relates to hydrogen storage field, concretely speaking, a 25MPa grade novel large capacity gas storage container. BACKGROUND

[0002] At present, hydrogen storage containers are mainly divided into low-pressure hydrogen storage containers and high-pressure hydrogen storage containers. Low-pressure hydrogen storage containers mainly use 3MPa or lower spherical tanks, which are suitable for hydrogen storage in hydrogen production plants. Spherical tanks are usually manufactured on site, and the welding process requires higher requirements. High-pressure hydrogen storage containers are mainly used in hydrogenation stations and mobile transportation, and common structures include spinning cylinders, multi-layer wrapped containers and steel band winding containers.

[0003] Although the existing hydrogen storage containers meet the demand of hydrogen storage to some extent, there are still the following shortcomings: the existing gaseous hydrogen storage containers mainly use spinning cylinders, spherical tanks, multi-layer wrapping and steel band winding structures. Spinning cylinders have high pressure and small single volume (about 1-1.5m3), and require spinning equipment and winding machines for manufacturing, which are mainly used for hydrogen storage in hydrogenation stations or mobile transportation. Spherical tanks have large volume and are suitable for hydrogen storage in hydrogen production plants, but the hydrogen storage pressure is low (3MPa), and the on-site welding manufacturing requires high requirements. Multi-layer wrapping and steel band winding containers can be used in hydrogen production plants, but the structure is complex, the welding seam is more, and special equipment such as layer wrapping machine and steel band winding machine is required, and there are fewer domestic manufacturers with manufacturing capacity. INVENTION CONTENTS

[0004] In order to solve the above problems, the utility model aims at providing a novel 25MPa grade large capacity high-pressure hydrogen storage container, which is ensured to be intrinsically safe through the integration of design, material selection, material performance test and welding process verification, and meets the demand of large-scale hydrogen storage in most areas of the country.

[0005] In order to achieve the above purpose, the following technical means are adopted in the scheme:

[0006] A novel large capacity high-pressure hydrogen storage container comprises:

[0007] An intermediate cylinder;

[0008] And a semispherical upper / right end cover and a semispherical lower / left end cover, the intermediate cylinder, the semispherical upper / right end cover and the semispherical lower / left end cover are connected through welding to form a single-layer plate structure cylindrical container;

[0009] The gas storage container can be configured as a vertical structure or a horizontal structure. The vertical structure is configured with a skirt, and the horizontal structure is configured with a saddle.

[0010] Further, a manhole is arranged on the semispherical lower / left end cover, a hydrogen inlet is arranged centrally on the semispherical upper / right end cover, and a hydrogen outlet, an instrument port, a safety valve port and a purging port are arranged.

[0011] The instrument port adopts a threaded connection structure, the threaded end surface roughness is not greater than Ra1.6 μm, and a red copper gasket is arranged;

[0012] The hydrogen outlet, the safety valve port, the exhaust port and the manhole are connected with the head by flanges, and the flange sealing surface is sealed by a stainless steel octagonal gasket sealing surface.

[0013] Further, the pressure-bearing weld of the gas storage container comprises a cylinder longitudinal weld, a cylinder girth weld, a cylinder and head weld and a connecting pipe weld, and the pressure-bearing weld adopts a full penetration butt welding structure.

[0014] Further, the main body material of the gas storage container is 09MnNiDR / 09MnNiD low-temperature carbon steel, and the working temperature range is-50 DEG C to 70 DEG C; the diameter range of the gas storage container is 900 mm to 4000 mm, and the applicable pressure grade is 0-25 MPa.

[0015] Further, the inner surface of the gas storage container is ground, and the inner surface roughness is less than Ra6.3 μm; the flange sealing surface 11 is machined, and the machining precision is less than Ra0.8 μm, and the bottom is chamfered and smoothly transitioned.

[0016] Further, the gas storage container is verified for sealing by helium leak detection test, and the leakage rate index is less than 1*10 -7 Pa·m 3 / s; and the hydrogen storage container is provided with a product witness during the manufacturing process, for performance retest under the hydrogen working condition.

[0017] Correspondingly, the utility model also provides a novel large-capacity high-pressure hydrogen storage container development method, comprising the following steps:

[0018] Receiving external design input, carrying out preliminary design of the hydrogen storage container according to JB4732 standard, including structure design, material selection, fatigue analysis design, determining key welding structure and welding process evaluation requirement;

[0019] For the material and welding structure of the preliminary design, material welding process research and performance test of the material in high-pressure hydrogen environment and air environment are carried out respectively, and the mechanical property change data of the base material and weld in the hydrogen environment are obtained;

[0020] The performance test data are fed back to the design link, and the final design scheme, structure, calculation parameter and welding process parameter are optimized and determined, and welding process evaluation is completed;

[0021] According to the determined design and welding process, material procurement, container manufacturing and processing are carried out, the manufacturing process includes head stamping, cylinder rolling, pipe processing, container assembly welding, and then the detection, heat treatment, final machining, water pressure test, helium leak detection, and inner and outer surface cleaning process are carried out in turn; during the container manufacturing process, typical structure test pieces are selected, and the performance test of the container test pieces under the hydrogen working condition is carried out at the same time, the manufacturing process is verified and adjusted according to the test results, and the product is completed after the manufacturing technology and inspection requirements are met.

[0022] Further, the welding process selects narrow gap groove welding and automatic argon arc welding; an octagonal gasket sealing surface is adopted, the sealing surface machining precision is less than Ra0.8um and the bottom chamfer is smoothly transitioned, the container inner surface is ground to a roughness of less than Ra6.3um; the helium leak detection test adopts one or more of the suction gun method, the shield method and the tracer probe method, and the leakage rate index is less than 1x10 -7 Pa·m 3 / s.

[0023] The hydrogen storage container has the following technical effects:

[0024] The hydrogen storage container adopts a single-layer plate structure cylindrical container, which is connected by welding of a middle cylinder, a hemispherical upper / right head and a hemispherical lower / left head. The design of the single-layer plate structure simplifies the manufacturing process of the container, reduces the manufacturing cost, and improves the strength and reliability of the container. Compared with the multi-layer wrapping or steel belt winding structure, the single-layer structure is easier to realize large volume design and can withstand higher pressure (25MPa), thereby solving the problem of small single volume of high-pressure hydrogen storage containers.

[0025] The diameter of the hydrogen storage container ranges from 900mm to 4000mm, and is suitable for pressure grades of 0~25MPa. By increasing the diameter and volume of the container, the hydrogen storage container can store more hydrogen and meet the demand of large-scale hydrogen storage. Compared with the traditional spinning gas cylinder (the single volume is about 1~1.5m 3 ), the hydrogen storage container can provide larger storage space and solve the problem of insufficient volume of existing high-pressure hydrogen storage containers.

[0026] The novel large-volume high-pressure hydrogen storage container of the utility model takes design, material selection and performance verification, and welding process verification as the prelude to container manufacturing, and carries out integrated coupling iteration, comprehensive evaluation of the reliability of design, material and manufacturing, and container manufacturing after determining the design and welding process, and key technology verification through sampling of test pieces in the manufacturing process, to ensure the intrinsic safety of the hydrogen storage container.

[0027] The scheme is coupled with integrated iteration by designing into manufacturing, carrying out hydrogen performance test of base material and weld structure, and evaluating reliability of design, material and welding process, and optimizing design and manufacturing process as a whole. BRIEF DESCRIPTION OF DRAWINGS

[0028] Figure 1 It is a 25MPa grade novel large-volume gas storage container technical implementation route of a specific embodiment of the utility model;

[0029] Figure 2 It is a 25MPa grade novel large-volume vertical structure of a specific embodiment of the utility model;

[0030] Figure 3 It is a 25MPa grade novel large-volume horizontal structure of a specific embodiment of the utility model;

[0031] Figure 4 It is a 25MPa grade novel large-volume main pipe port layout of a specific embodiment of the utility model.

[0032] Corresponding numbers in the drawing:

[0033] 1, intermediate cylinder; 2, hemispherical lower / left head; 3, hemispherical upper / right head; 4, manhole; 5, hydrogen inlet; 6, hydrogen outlet; 7, instrument port; 8, safety valve port; 9, purging port; 10, threaded connection structure; 11, octagonal gasket sealing surface; 12, pressure-bearing weld. DETAILED DESCRIPTION

[0034] The embodiments of the present application will be described in detail with specific examples, and those skilled in the art can easily understand other advantages and effects of the present application from the disclosure. The present application can also be implemented or applied in different specific embodiments, and various modifications or changes can be made based on different views and applications without departing from the spirit of the present application. It should be noted that the drawings provided in the following examples only illustrate the basic concept of the present application in a schematic manner, and the features in the following examples and embodiments can be combined with each other without conflict.

[0035] Wherein, the drawings are only used for example illustration, and the representation is only a schematic diagram, not a physical diagram, and cannot be understood as a limitation of the present application; in order to better illustrate the embodiments of the present application, some components in the drawings are omitted, enlarged or reduced, and do not represent the size of the actual product; for those skilled in the art, the omission of some known structures and their description in the drawings is understandable.

[0036] Please refer to Figure 1 , Figure 1The utility model discloses a 25MPa grade novel large-volume gas storage container technical implementation route. The utility model provides a novel large-volume high pressure hydrogen storage container, and its development method comprises the following steps: firstly, receiving external design input, carrying out the preliminary design of hydrogen storage container according to JB4732 standard, including structure design, material selection, fatigue analysis design, determining key welding structure and welding process evaluation requirement. Then, for the material and welding structure of preliminary design, respectively carry out material welding process research and performance test of material in high pressure hydrogen environment and air environment, obtain the mechanical property change data of base material and weld in hydrogen environment. Subsequently, the performance test data is fed back to the design link, and the final design scheme, structure, calculation parameter and welding process parameter are optimized and determined, and welding process evaluation is completed. Finally, according to the determined design and welding process, material procurement, container manufacturing are carried out, and the manufacturing process includes head stamping, cylinder rolling, pipe processing, container group welding, and then flaw detection, heat treatment, final machining, water pressure test, helium leak detection, inner and outer surface cleaning process are carried out in turn. In the container manufacturing process, the typical structure test piece is selected, and the performance test of the container test piece under the hydrogen working condition is carried out simultaneously, the manufacturing process is verified and adjusted according to the test result, the container intrinsic safety is ensured, and the product is completed after meeting the manufacturing technology and inspection requirements.

[0037] Please refer to Figure 2 and 4 , Figure 2 The utility model discloses a 25MPa grade novel large-volume vertical structure. The hydrogen storage container includes intermediate cylinder 1, hemispherical upper / right head 3 and hemispherical lower / left head 2, and the intermediate cylinder 1 is connected with the hemispherical upper / right head 3 and the hemispherical lower / left head 2 through welding, forming a single-layer plate structure cylindrical container. The gas storage container can be configured as a vertical structure, and the vertical structure is configured with a skirt. A manhole 4 is arranged on the hemispherical lower / left head 2, and a hydrogen inlet 5 is arranged centrally on the hemispherical upper / right head 3, and a hydrogen outlet 6, an instrument port 7, a safety valve port 8 and a purging port 9 are arranged. The instrument port 7 adopts a threaded connection structure 10, the threaded end surface roughness is not more than Ra1.6 μm, and a red copper gasket is configured. The hydrogen outlet 6, the safety valve port 8, the purging port 9 and the manhole 4 are connected with the head through a flange, and the flange sealing surface adopts a stainless steel octagonal gasket sealing surface 11.

[0038] Please refer to Figure 3 and 4 , Figure 3The utility model discloses a 25MPa grade novel large-volume horizontal structure. The hydrogen storage container also comprises an intermediate cylinder 1, a hemispherical upper / right end cover 3 and a hemispherical lower / left end cover 2, the intermediate cylinder 1 is connected with the hemispherical upper / right end cover 3 and the hemispherical lower / left end cover 2 through welding, and a single-layer plate structure cylindrical container is formed. The gas storage container can be configured as a horizontal structure, and the horizontal structure is configured with a saddle. A manhole 4 is arranged on the hemispherical lower / left end cover 2, a hydrogen inlet 5 is arranged centrally on the hemispherical upper / right end cover 3, and a hydrogen outlet 6, an instrument port 7, a safety valve port 8 and a venting port 9 are arranged. The instrument port 7 adopts a threaded connection structure 10, the threaded end surface roughness is not greater than Ra1.6 μm, and a red copper gasket is arranged. The hydrogen outlet 6, the safety valve port 8, the venting port 9 and the manhole 4 are connected with the end cover through a flange, and the flange sealing surface adopts a stainless steel octagonal gasket sealing surface 11.

[0039] The pressure-bearing weld 12 of the hydrogen storage container comprises a cylinder longitudinal weld, a cylinder girth weld, a cylinder and end cover weld and a connecting pipe weld, and adopts a full penetration butt welding structure. The main material of the gas storage container is 09MnNiDR / 09MnNiD low-temperature carbon steel, the working temperature range is-50 DEG C to 70 DEG C, the diameter range of the gas storage container is 900mm to 4000mm, and the applicable pressure grade is 0-25MPa. The inner surface of the gas storage container is ground, and the inner surface roughness is less than Ra6.3 μm; the flange sealing surface 11 is machined, and the machining precision is less than Ra0.8 μm, and the bottom is chamfered and smoothly transitioned. The gas storage container is sealed through helium leak detection test, and the leakage rate index is less than 1*10 -7 Pa·m 3 / s; the hydrogen storage container is provided with a product sample in the manufacturing process, and is used for performance rechecking under the hydrogen working condition.

[0040] The 25MPa grade novel large-volume high-pressure hydrogen storage container is a single-layer, welded, high-pressure, large-volume fixed hydrogen storage container, and design and manufacturing are integrated. Through design, material selection, material performance verification, welding process verification, feedback design standardization and other steps, design and manufacturing are coupled and iterated, the hydrogen storage container is manufactured according to the determined design and welding process, the container is ensured to be intrinsically safe through sample sampling and verification in the manufacturing process.

Claims

1. A novel large-volume high-pressure hydrogen storage container, characterized by, It comprises: an intermediate cylinder (1); and a hemispherical upper / right head (3) and a hemispherical lower / left head (2), which are connected by welding to form a single-layer plate structure cylindrical container. The gas storage container can be configured as a vertical structure or a horizontal structure, and the vertical structure is configured with a skirt and the horizontal structure is configured with a saddle.

2. The new large-volume gas storage container according to claim 1, characterized in that: a manhole (4) is arranged on the hemispherical lower / left head (2), a hydrogen inlet (5) is arranged centrally on the hemispherical upper / right head (3), and a hydrogen outlet (6), an instrument port (7), a safety valve port (8), and a vent port (9) are arranged; the instrument port (7) adopts a threaded connection structure (10), the threaded end surface roughness is not greater than Ra1.6μm, and a red copper gasket is configured; the hydrogen outlet (6), the safety valve port (8), the vent port (9), and the manhole (4) are connected with the head by flanges, and the flange sealing surface adopts a stainless steel octagonal gasket sealing surface (11).

3. The new large-volume gas storage container according to claim 1, characterized in that: the pressure-bearing weld (12) of the gas storage container comprises a cylinder longitudinal weld, a cylinder circumferential weld, a cylinder and head weld, and a pipe weld, and the pressure-bearing weld (12) adopts a full penetration butt welding structure.

4. The new large-volume gas storage container according to claim 1, characterized in that: the working temperature range of the gas storage container is -50℃ to 70℃; the diameter range of the gas storage container is 900mm to 4000mm, and the applicable pressure grade is 0-25MPa.

5. The new large-volume gas storage container according to claim 1, characterized in that: the inner surface roughness of the gas storage container is less than Ra6.3μm; and the bottom of the flange sealing surface (11) is chamfered and smoothly transitioned.

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