Ship cryogenic device electrical cabinet preparatory cabin and low-temperature test method

Abstract

The invention discloses a preliminary cabin for an electrical cabinet of a ship cryogenic device and a low-temperature test method, and the method comprises the steps: arranging a preliminary cabin for the electrical cabinet at a position, which is closer to the cryogenic device, outside an explosion-proof region of a test center, and placing the electrical cabinet of the cryogenic device in the preliminary cabin for the electrical cabinet; the electrical cabinet preparation cabin is used for providing stable operation environments such as fire prevention, dust prevention, ventilation, constant temperature and constant humidity for the electrical cabinet so as to simulate a real test environment of a sea test, so that the operation performance of the cryogenic device in a low-temperature state can be accurately tested on the land.

Description

Technical Field

[0001] This invention relates to the field of shipbuilding technology, and in particular to a preparatory compartment for an electrical cabinet of a ship cryogenic device and a method for low-temperature testing. Background Technology

[0002] Currently, LNG cryogenic units are mainly used to "supercool" the LNG inside LNG carriers and then spray it back into the hold to reduce the temperature of the cargo hold and reduce the generation of bulky gas (BOG).

[0003] Typically, during the gas trial phase after the completion of construction of a newly built LNG carrier and before its commissioning, the cryogenic unit needs to undergo natural gas operation testing. Currently, cryogenic unit low-temperature testing is usually conducted during sea trials after the ship's construction is completed, in conjunction with the actual loading of LNG. However, due to the limited space on board the ship, the commissioning of the cryogenic unit is quite complex, affecting the overall sea trial cycle and potentially posing safety hazards. Summary of the Invention

[0004] In view of this, the present invention provides a preparatory compartment for the electrical cabinet of a ship cryogenic device and a method for low-temperature testing, in order to solve the problems existing in the above-mentioned background art.

[0005] A preparatory compartment for a marine cryogenic device electrical cabinet includes a preparatory compartment body, an overhead layer at the bottom of the preparatory compartment body, and piers for supporting the preparatory compartment body and the overhead layer. The preparatory compartment body is located on land near the placement location of the cryogenic device. The electrical cabinet is placed inside the preparatory compartment body. The surface of the preparatory compartment body is provided with ventilation doors, personnel doors, air handling equipment, and inlet and outlet flanges for connecting external cooling water pipes and internal cooling water hoses. The end of the internal cooling water hoses is fitted with a docking flange for connecting with the cooling water inlet and outlet flanges of the electrical cabinet. The bottom of the preparatory compartment body has a cable inlet hole. Firewalls are provided on all four sides of the inner wall and the inner side of the top plate of the preparatory compartment body.

[0006] Preferably, the top plate of the GCU preparation chamber is also equipped with multiple waterproof lights.

[0007] Preferably, the GCU preparation chamber includes a main chamber with an upper opening and a top plate that is detachably mounted on the top of the main chamber. A top cover plate is fixed to the upper surface of the top plate, and multiple top cover plate pressing blocks are also provided on the front and rear sides of the top plate. The upper ends of the top cover plate pressing blocks are fixed to the top cover plate by fasteners, and the lower ends are welded to the top of the main chamber.

[0008] Preferably, the lower surface of the top plate is provided with multiple detachable reinforcing beams along its length, and the top plate is also provided with multiple top cover lifting rings.

[0009] Preferably, the firewall includes a fireproof interior panel, a fireproof insulation material, and a corrugated board arranged sequentially from the inside out, with at least one layer of fireproof insulation material.

[0010] Preferably, the pier includes a support frame consisting of lateral and longitudinal supports, multiple legs fixed to the bottom of the support frame, and an oblique support elbow plate that connects the support frame and the legs at an angle. The legs are connected to embedded parts on the ground.

[0011] Preferably, ventilation doors are provided on the front and left and right sides of the GCU preparation compartment; the pedestrian door, air handling equipment and inlet / outlet reserved flanges are all provided on the front side of the GCU preparation compartment, and the air handling equipment is symmetrically arranged, with the inlet / outlet reserved flanges located below the air handling equipment.

[0012] Preferably, the elevated floor includes an upper frame, a lower frame, and a support frame connecting the upper frame and the lower frame. An electrical cabinet support base and an anti-static floor are provided on the upper frame. The electrical cabinet support base is located in the center of the upper frame, and the anti-static floor is located on both sides of the electrical cabinet support base. Multiple reinforcing supports are provided at equal intervals along the length of the lower frame, and cable inlet holes are opened on the frame base plate between two reinforcing supports.

[0013] A method for conducting cryogenic testing of a gas cryogenic control unit (GCU) using a preparatory compartment for a ship's cryogenic equipment electrical cabinet specifically includes the following steps:

[0014] S1, Arrange the preparatory cabins near the location of the cryogenic device on land;

[0015] S2, open the top plate and detachable steel grid of the preparation compartment, and slowly lower the electrical cabinet from the top opening of the preparation compartment to the electrical cabinet support base (30) inside the compartment;

[0016] S3, pass the cable installed on the cryogenic unit through the cable inlet hole of the preparatory compartment and connect it to the electrical cabinet inside the compartment. At the same time, connect the cooling water inlet and outlet flanges of the electrical cabinet to the connecting flanges at the end of the internal cooling water hoses. Then connect the reserved flanges of the inlet and outlet to the external cooling water pipes. After the electrical cabinet of the cryogenic unit is installed, close and lock the top cover.

[0017] S4, connect the cryogenic device to the test pipeline;

[0018] S5. Nitrogen gas is introduced into the cryogenic device through the test pipeline to purge and lower the dew point. After the dew point reaches the test requirements, low-temperature natural gas is introduced into the cryogenic device to simulate the low-temperature conditions of the actual operating environment.

[0019] S6. Under simulated test conditions, start the cryogenic device and observe and record its performance indicators.

[0020] The beneficial effects of this invention are:

[0021] 1. This invention sets up an electrical cabinet preparation compartment near the cryogenic device outside the explosion-proof zone of the test center, and places the cryogenic electrical cabinet in the electrical cabinet preparation compartment. The electrical cabinet preparation compartment provides the electrical cabinet with a stable operating environment such as fire prevention, dust prevention, ventilation, constant temperature and humidity, so as to simulate the real test environment of the marine test. Thus, the operating performance of the cryogenic device under low temperature conditions can be tested relatively accurately on land.

[0022] 2. This invention arranges the electrical cabinet preparation compartment near cryogenic environments, which has advantages such as short installation distance, simple installation process, stable operating environment, and convenient maintenance, thereby better meeting the requirements of cryogenic environments for electrical cabinet distance and environment; and the preparation compartment is combined with steel structure piers, and the two are fixed by electric welding or buckle, which can realize the preparation compartment to be deployed in multiple locations as needed.

[0023] 3. The preparation compartment of the present invention has multiple cable inlet holes and a side door at the bottom, which can greatly improve the working environment for subsequent maintenance of the electrical cabinet and facilitate the cable arrangement.

[0024] 4. The top plate of the preparation compartment of the present invention adopts a detachable flip-top design and is equipped with a detachable reinforcing beam. At the same time, the bottom surface of the preparation compartment is equipped with multiple transverse supports, which can be adapted to the hoisting and fixed installation of electrical cabinets of natural gas combustion devices of different sizes.

[0025] 5. The preparatory compartment of the present invention is supported by an overhead layer, which can greatly improve the working environment for subsequent maintenance of the electrical cabinet, and at the same time facilitate the laying of cables. Attached Figure Description

[0026] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0027] Figure 1 This is a structural schematic diagram of the preparatory compartment for the electrical cabinet of the cryogenic device.

[0028] Figure 2 This is a side view of the preparation compartment for the cryogenic equipment electrical cabinet.

[0029] Figure 3 This is a top view of the elevated floor.

[0030] Figure 4 This is a bottom view of the elevated floor.

[0031] Figure 5This is a structural diagram of the electrical cabinet support base.

[0032] Figure 6 This is a top view of the pier.

[0033] Figure 7 This is a front view of the pier.

[0034] Figure 8 This is a side view of the pier.

[0035] Figure 9 This is a schematic diagram showing the four sides of the preparatory cabin unfolded.

[0036] Figure 10 This is a schematic diagram of the firewall 16.

[0037] Figure 11 This is an internal top view of the preparatory hull.

[0038] The meanings of the labels in the diagram are as follows:

[0039] 1 is the pre-construction compartment; 2 is the compartment block; 3 is the ventilation door; 4 is the air handling equipment; 5 is the pedestrian door; 6 is the reserved flange for import and export; 7 is the fireproof interior panel; 8 is the fireproof insulation material; 9 is the detachable reinforcing beam; 10 is the top plate; 11 is the top cover plate; 12 is the top cover lifting ring; 13 is the top cover plate pressure block; 14 is the corrugated plate; 15 is the waterproof light; 16 is the firewall; 17 is the reinforcing support; 18 is the cable inlet hole; 19 is the lateral support; 20 is the longitudinal support; 21 is the embedded part; 22 is the diagonal support elbow plate; 23 is the support leg; 24 is the elevated layer; 25 is the internal cooling water hose; 26 is the docking flange; 27 is the upper frame; 28 is the lower frame; 29 is the support frame; 30 is the electrical cabinet support base; 31 is the anti-static floor; 32 is the detachable steel grating. Detailed Implementation

[0040] To make the objectives, technical solutions, and advantages of this invention clearer, the invention is described below with reference to specific embodiments shown in the accompanying drawings. However, it should be understood that these descriptions are merely exemplary and not intended to limit the scope of the invention. Furthermore, descriptions of well-known structures and technologies are omitted in the following description to avoid unnecessarily obscuring the concept of the invention.

[0041] The terminology used in this disclosure is for the purpose of describing particular embodiments only and is not intended to be limiting of the disclosure. The singular forms “a,” “the,” and “the” as used in this disclosure and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the term “and / or” as used herein refers to and includes any and all possible combinations of one or more of the associated listed items.

[0042] In the description of this invention, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0043] In the description of this invention, unless otherwise specified and limited, it should be noted that the terms "installation", "connection" and "linking" should be interpreted broadly. For example, they can refer to mechanical or electrical connections, or internal connections between two components. They can be direct connections or indirect connections through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms according to the specific circumstances.

[0044] To better understand the technical solution of the present invention, the present invention will be described in detail below with reference to the accompanying drawings.

[0045] The present invention provides a preparatory compartment for an electrical cabinet of a ship cryogenic device, comprising a preparatory compartment body 1, an overhead layer 24 disposed at the bottom of the preparatory compartment body 1, and a pier 2 for supporting the preparatory compartment body 1 and the overhead layer 24.

[0046] The preparation chamber 1 is located on land near the cryogenic device's placement location, but the distance between the preparation chamber 1 and the cryogenic device should not be less than the explosion-proof safety distance of the cryogenic device. In this embodiment, the distance between the preparation chamber 1 and the cryogenic device is not less than 4.5 meters.

[0047] The electrical cabinet is placed inside the preparatory compartment 1, which provides a stable operating environment for the electrical cabinet, including fire prevention, explosion prevention, dust prevention, ventilation, constant temperature, and constant humidity.

[0048] The preparatory compartment 1 includes a main compartment with an upper opening and a top plate 10 detachably mounted on the top of the main compartment. A top cover plate 11 is fixed to the upper surface of the top plate 10. Multiple top cover plate clamping blocks 13 are also provided on the front and rear sides of the top plate 10. The lower end of the top cover plate clamping block 13 is welded and fixed to the top of the main compartment, and the upper end is fixed to the top cover plate 11 by fasteners. When the fasteners are removed, the top plate 10 and the top cover plate 11 above it can be removed together so that the electrical cabinet can be hoisted into the compartment from the upper opening of the main compartment.

[0049] In other embodiments, one side of the top plate 10 can be hinged and fixed to the main body, and a top cover plate pressure block 13 can be provided on the other side of the top plate 10. The lower end of the top cover plate pressure block 13 is welded and fixed to the top of the main body, and the upper end is fixed to the top cover plate 11 by fasteners. When the fasteners are removed, the top plate 10 can be rotated and opened, and then the electrical cabinet can be hoisted into the cabin from the upper opening of the main body.

[0050] Preferably, the lower surface of the top plate 10 is provided with multiple detachable reinforcing beams 9 along its length to strengthen its structure, and the top plate 10 is also provided with multiple top cover lifting rings 12 for lifting the top plate 10.

[0051] Ventilation doors 3 are provided on the deck of the preparation compartment 1. In this embodiment, ventilation doors 3 are provided on the front and left and right sides of the preparation compartment 1.

[0052] The preparatory compartment 1 is also equipped with a pedestrian door 5, an air handling unit 4, and inlet / outlet flanges 6 for connecting cooling water pipes to cool the electrical cabinet. In this embodiment, the pedestrian door 5, air handling unit 4, and inlet / outlet flanges 6 are all located on the front surface of the preparatory compartment 1, with the air handling unit 4 symmetrically arranged. The inlet / outlet flanges 6 are located below the air handling unit 4 and are used to connect cooling water pipes. The air handling unit 4 is used to regulate the temperature and humidity inside the compartment. The air handling unit 4 can be an industrial air conditioner or a fan, etc.

[0053] The front surface of the pre-construction compartment 1 is equipped with two sets of inlet / outlet flanges 6. These flanges connect to the external cooling water pipes and internal cooling water hoses 25. Each internal cooling water hose 25 includes an internal cooling water inlet hose and an internal cooling water outlet hose. Each internal cooling water hose 25 has a mating flange 26 at its end for connection to the cooling water inlet / outlet flanges of the electrical cabinet. At least three different standard flange specifications can be installed on the internal cooling water hose 25 to allow connection to the cooling water inlet / outlet flanges of different models of electrical cabinets.

[0054] The bottom plate of the preparation compartment 1 is provided with multiple preparation compartment lifting rings on both sides for lifting the entire preparation compartment. Firewalls 16 are provided on the inner walls and the inner side of the top plate of the preparation compartment 1.

[0055] The firewall 16 includes a fireproof interior panel 7, fireproof insulation material, and corrugated board arranged sequentially from the inside out. At least one layer of fireproof insulation material is provided. In this embodiment, the fireproof interior panel and corrugated board are reinforced with two layers of fireproof insulation material. One layer is rock wool board, and the other layer is ceramic wool. Therefore, the firewall includes the fireproof interior panel, rock wool board, ceramic wool, and corrugated board arranged sequentially from the inside out. The fireproof interior panel can be made of 1mm galvanized steel plate, the rock wool board is 30mm thick, the ceramic wool is 20mm thick, and the corrugated board has a thickness of 1.6mm around its perimeter and 2mm in the center.

[0056] Preferably, the top plate of the preparation chamber 1 is also equipped with a plurality of waterproof lights 15.

[0057] Preferably, the bottom of the preparation compartment 1 is provided with a plurality of reinforcing supports 17, which are equally spaced along the length of the preparation compartment, and the cable inlet hole 18 is opened on the bottom plate between two reinforcing supports 17.

[0058] The bottom of the preparation compartment 1 is also provided with an elevated layer 24, which is used to support the preparation compartment 1. The elevated layer 24 includes an upper frame 27, a lower frame 28, and a support frame 29 connecting the upper frame 27 and the lower frame 28. An electrical cabinet support base 30 and an anti-static floor 31 are provided on the upper frame 27. The electrical cabinet support base 30 is located in the center of the upper frame 27, and the anti-static floor 31 is located on both sides of the electrical cabinet support base 30. The electrical cabinet support base 30 is a rectangular frame and a detachable steel grid 32 is provided in its hollow unit frame. Multiple reinforcing supports 17 are provided at equal intervals along the length of the lower frame 28. The cable inlet hole 18 is opened on the detachable steel plate between two reinforcing supports 17.

[0059] Below the elevated floor 24, there is a pier 2, which is connected to the embedded part 21 on the ground to support the elevated floor 24 and the pre-built cabin 1.

[0060] The pier 2 includes a support frame consisting of a transverse support 19 and a longitudinal support 20, multiple legs 23 fixed to the bottom of the support frame, and an oblique support elbow plate 22 that connects the support frame and the legs 23 at an angle. The legs 23 are connected to embedded parts 21 on the ground.

[0061] Assume that the length, width, and height of the preparatory hull 1 are X, Y, and H, respectively, and that X ≥ 12m, Y ≥ 2.8m, and H ≥ 3.4m.

[0062] The height of the elevated floor 24 is H1, 0.4m≤H1≤0.8m; the length of the electrical cabinet support base 30 on the upper frame 27 of the elevated floor is X1, and X≥X1≥0.9X; the width of the electrical cabinet support base 30 is Y1, 0.6m≤Y1≤0.8m; the length of the hollow unit frame of the electrical cabinet support base 30 is X3, 0.8m≤X3≤1.0m.

[0063] The width of the detachable steel plate between two adjacent reinforcing supports 17 of the lower frame 28 of the overhead floor 24 is X4 and the length is Y2, 0.6m≤Y2≤1.0m. The total length X2 of the opening area covered by all cable inlet holes must satisfy X≥X2≥0.8X.

[0064] The steel structure pier 2 has two longitudinal supports 20, each with a length of X5, where X5 = X. The spacing between the longitudinal supports 20 is Y3, where Y3 = Y. There are n transverse supports 19 between the longitudinal supports 20, where n ≥ 5. There are legs 23 at the connection between the transverse supports 19 and the longitudinal supports 20, and multiple support plates 22 are located at the legs 23. The height of the steel structure pier 2 is H2, and it must be 0.5m ≤ H2 ≤ 0.7m.

[0065] This invention also provides a method for conducting low-temperature testing using the aforementioned preparatory compartment for the electrical cabinet of a ship's cryogenic device, specifically comprising the following steps:

[0066] S1, Arrange the preparatory compartment 1 near the location of the cryogenic device on land;

[0067] S2, open the top plate 10 and the detachable steel grid of the preparatory compartment 1, and slowly lower the electrical cabinet from the top opening of the preparatory compartment 1 to the electrical cabinet support base inside the compartment.

[0068] S3, pass the cable installed on the cryogenic device through the cable inlet hole 18 of the preparatory compartment 1 and connect it to the electrical cabinet inside the compartment. At the same time, connect the cooling water inlet and outlet flanges of the electrical cabinet to the docking flange 26 at the end of the internal cooling water hose 25. Then connect the inlet and outlet reserved flanges 6 to the external cooling water pipe. After the electrical cabinet of the cryogenic device is installed, cover and lock the top plate 10.

[0069] S4, connect the cryogenic device to the test pipeline;

[0070] S5. Nitrogen gas is introduced into the cryogenic device through the test pipeline to purge and lower the dew point. After the dew point reaches the test requirements, low-temperature natural gas is introduced into the cryogenic device to simulate the low-temperature conditions of the actual operating environment.

[0071] S6. Under simulated test conditions, start the cryogenic device and observe and record its performance indicators.

[0072] The aforementioned electrical cabinet is also connected to the central control room of the testing center via cables, so that the test data of the low temperature test can be transmitted to the central control room in a timely manner.

[0073] It should be understood that the described embodiments are merely some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

Claims

1. A preparatory compartment for an electrical cabinet of a marine cryogenic equipment, characterized in that, The preparation compartment (1) includes a preparatory compartment (1), an overhead layer (24) located at the bottom of the preparatory compartment (1), and a pier (2) for supporting the preparatory compartment (1) and the overhead layer (24). The preparatory compartment (1) is located on land near the location where the cryogenic device is placed. The electrical cabinet is placed inside the preparatory compartment (1). The preparatory compartment (1) is provided with ventilation doors (3), pedestrian doors (5), air handling equipment (4), and inlet and outlet flanges (6) for connecting external cooling water pipes and internal cooling water hoses (25). The end of the internal cooling water hose (25) is fitted with a docking flange (26) for connecting with the cooling water inlet and outlet flanges of the electrical cabinet. The bottom of the GCU preparatory compartment (1) is provided with a cable inlet hole (18). Firewalls (16) are provided on the inner walls and the inner side of the top plate of the GCU preparatory compartment (1).

2. The preparatory compartment for the electrical cabinet of the marine cryogenic equipment according to claim 1, characterized in that, The top plate of the GCU preparation compartment (1) is also equipped with multiple waterproof lights (15).

3. The preparatory compartment for the electrical cabinet of the marine cryogenic equipment according to claim 1, characterized in that, The GCU preparation compartment (1) includes a main compartment with an upper opening and a top plate (10) that can be detachably installed on the top of the main compartment. A top cover plate (11) is fixed on the upper surface of the top plate (10). Multiple top cover plate pressure blocks (13) are also provided on the front and rear sides of the top plate (10). The upper end of the top cover plate pressure block (13) is fixed to the top cover plate (11) by fasteners, and the lower end is welded and fixed to the top of the main compartment.

4. The preparatory compartment for the electrical cabinet of the marine cryogenic equipment according to claim 3, characterized in that, The lower surface of the top plate (10) is provided with multiple detachable reinforcing beams (9) along its length, and the top plate (10) is also provided with multiple top cover lifting rings (12).

5. The preparatory compartment for the electrical cabinet of the marine cryogenic equipment according to claim 1, characterized in that, The firewall (16) includes a fireproof interior panel (7), a fireproof insulation material (8) and a corrugated board (14) arranged sequentially from the inside to the outside, and the fireproof insulation material (8) is provided with at least one layer.

6. The preparatory compartment for the electrical cabinet of the marine cryogenic equipment according to claim 1, characterized in that, The pier (2) includes a support frame consisting of a transverse support (19) and a longitudinal support (20), multiple legs (23) fixed at the bottom of the support frame, and an oblique support elbow plate (22) that connects the support frame and the legs (23) at an angle. The legs (23) are connected to embedded parts (21) on the ground.

7. The preparatory compartment for the electrical cabinet of the marine cryogenic equipment according to claim 1, characterized in that, Ventilation doors (3) are provided on the front and left and right sides of the GCU preparation chamber (1); the pedestrian door (5), air handling equipment (4) and inlet / outlet reserved flange (6) are all provided on the front side of the GCU preparation chamber (1), and the air handling equipment (4) is symmetrically arranged, and the inlet / outlet reserved flange (6) is located below the air handling equipment (4).

8. The preparatory compartment for the electrical cabinet of the marine cryogenic equipment according to claim 1, characterized in that, The elevated floor (24) includes an upper frame (27), a lower frame (28), and a support frame (29) connecting the upper frame (27) and the lower frame (28). An electrical cabinet support base (30) and an anti-static floor (31) are provided on the frame of the upper frame (27). The electrical cabinet support base (30) is located in the center of the frame of the upper frame (27), and the anti-static floor (31) is located on both sides of the electrical cabinet support base (30). Multiple reinforcing supports (17) are provided at equal intervals along the length of the frame of the lower frame (28). Cable inlet holes (18) are opened on the frame base plate between two reinforcing supports (17).

9. A method for conducting low-temperature testing using the preparatory compartment of the electrical cabinet for a ship's cryogenic device as described in any one of claims 1-8, characterized in that, Specifically, the following steps are included: S1, Arrange the preparatory cabin (1) near the location of the cryogenic device on land; S2, open the top plate (10) and detachable steel grid (32) of the preparatory compartment (1), and slowly lower the electrical cabinet from the top opening of the preparatory compartment (1) to the electrical cabinet support base (30) inside the compartment; S3, pass the cable installed on the cryogenic device through the cable inlet hole (18) of the preparatory compartment (1) and connect it to the electrical cabinet inside the compartment. At the same time, connect the cooling water inlet and outlet flanges of the electrical cabinet to the docking flange (26) at the end of the internal cooling water hose (25). Then connect the inlet and outlet reserved flanges (6) to the external cooling water pipe. After the electrical cabinet of the cryogenic device is installed, close and lock the top plate (10). S4, connect the cryogenic device to the test pipeline; S5. Nitrogen gas is introduced into the cryogenic device through the test pipeline to purge and lower the dew point. After the dew point reaches the test requirements, low-temperature natural gas is introduced into the cryogenic device to simulate the low-temperature conditions of the actual operating environment. S6. Under simulated test conditions, start the cryogenic device and observe and record its performance indicators.

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