A cold box with a concave drainage structure

Abstract

This utility model provides a cold box with a concave drainage structure, including a cold box body with a concave surface for installing valves. The cold box body also has a drainage pipe penetrating the cold box body. The drainage pipe has an inlet communicating with the bottom of the concave surface and an outlet located on the side wall adjacent to the concave surface of the cold box body. The drainage pipe is inclined so that the height of the outlet is lower than the height of the inlet. The drainage pipe includes a first pipe section welded to the bottom of the concave surface, a bend connected to the end of the first pipe section, and a second pipe section with one end connected to the bend and the other end extending through the side wall adjacent to the concave surface of the cold box body to form the outlet. This utility model, by setting a through-type inclined drainage pipe, utilizes gravity to continuously drain water accumulated in the concave surface of the cold box, solving the water accumulation problem and avoiding safety hazards such as equipment corrosion and moisture failure of the insulation layer.

Description

Technical Field

[0001] This utility model relates to a cold box, specifically a cold box with a concave drainage structure, belonging to the field of cryogenic equipment technology. Background Technology

[0002] In cryogenic separation industries such as liquefied natural gas, air separation, and ethylene, large cold boxes are crucial equipment. As plant scale increases, the size of cold boxes also grows, especially their height and width, often exceeding road transport limits. To address this issue, a common industry design involves creating a concave surface on the top or side of the cold box. Valves, pipes, and other accessories that would otherwise be externally mounted are installed within this concave space, effectively reducing the overall transport dimensions of the equipment.

[0003] However, while the concave design solves the problem of excessive height during transport, it easily accumulates rainwater, snowmelt, or condensation in outdoor environments. This accumulated water cannot drain effectively, and prolonged immersion can cause corrosion on the metal panels, valve bodies, and flange connections of the concave surface, shortening the equipment's lifespan. Furthermore, accumulated water may leak into the insulation layer inside the cold box through the welds or seals of the valve rings, compromising its thermal insulation performance and causing significant cooling loss and safety hazards.

[0004] To solve the waterproofing problem of the concave surface, the conventional approach is to install a metal protective cover on the cold box. However, this increases the manufacturing cost, and on-site installation and disassembly require manpower and time. In order to ensure a seal, sealant must be applied to the joints. However, the sealant may still age and fail under long-term exposure to sun and rain, and cannot guarantee a long-term reliable seal. If the protective cover fails to seal, water accumulation will still occur, and it will be more difficult to detect and deal with. Utility Model Content

[0005] Based on the above background, the purpose of this utility model is to provide a cold box with a concave surface drainage structure, which solves the technical problems of water accumulation, corrosion and leakage caused by the concave surface of existing large cold boxes.

[0006] To achieve the above-mentioned objectives, this utility model provides the following technical solution:

[0007] A cold box with a concave drainage structure includes a cold box body with a concave surface for installing valves. The cold box body also has a drainage pipe penetrating the cold box body. The drainage pipe has an inlet communicating with the bottom of the concave surface and an outlet located on the side wall adjacent to the concave surface of the cold box body. The drainage pipe is inclined so that the height of the outlet is lower than the height of the inlet. The drainage pipe includes a first pipe section welded to the bottom of the concave surface, a bend connected to the end of the first pipe section, and a second pipe section with one end connected to the bend and the other end extending through the side wall adjacent to the concave surface of the cold box body to form the outlet.

[0008] The aforementioned concave drainage structure physically penetrates the cold box body and functionally enables external drainage. By utilizing gravitational potential energy, this structure can continuously drain the water accumulated at the bottom of the concave surface, solving the problem of water accumulation in the concave part of the cold box. Its structure is simple and highly reliable.

[0009] Preferably, the second pipe section is inclined relative to the horizontal plane.

[0010] The inclined structure is mainly set in the second pipe section, which simplifies the vertical welding process between the first pipe section and the bottom of the concave surface, making the manufacturing and installation of the entire drainage slope more convenient.

[0011] Preferably, the drain pipe is made of stainless steel.

[0012] Since the drainage pipes run through the cold box, which has an ultra-low temperature environment, a significant cold bridge effect will occur. Stainless steel is selected because it can resist long-term corrosion from rainwater, and its excellent low-temperature toughness prevents the pipes from brittlely breaking due to low temperature.

[0013] Preferably, the cold box body is provided with a concave metal panel, the concave surface is disposed on the concave metal panel, and the surface of the concave metal panel is provided with an opening for sealing and welding with the drainage pipe, the opening being configured as the water inlet.

[0014] Preferably, at least two sets of drainage pipes are provided, and each set is located adjacent to one of the two side walls of the cold box body.

[0015] Preferably, the concave surface is further provided with a valve ring for welding with the valve, and the water inlet is located on the concave surface away from the valve ring.

[0016] Compared with the prior art, the present invention has the following advantages:

[0017] This invention relates to a cold box with a concave drainage structure. By setting up a through-type inclined drainage pipe, it utilizes gravity to continuously drain water accumulated in the concave surface of the cold box, solving the problem of water accumulation and avoiding safety hazards such as equipment corrosion and moisture failure of the insulation layer. Compared with existing protective cover solutions that are complex in structure, rely on sealant, and are prone to failure, this invention adopts a fully welded pipe structure with no aging components, achieving long-term reliable drainage. This invention only adds a small amount of standard pipe to the cold box manufacturing process, and the material cost and labor cost of processing and installation are far lower than manufacturing and installing a complete metal protective cover, resulting in significant economic advantages. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0019] Figure 1 This is a partial structural diagram of a cold box with a concave drainage structure according to the present invention;

[0020] Figure 2 This is a top view schematic diagram of a cold box with a concave drainage structure according to the present invention;

[0021] In the diagram: 1. Cold box body; 2. Concave surface; 3. Column; 4. Valve; 5. Valve ring; 6. First pipe section; 7. Bend; 8. Second pipe section; 9. Side wall. Detailed Implementation

[0022] The technical solution of this utility model will be further described in detail below through specific embodiments and in conjunction with the accompanying drawings. It should be understood that the implementation of this utility model is not limited to the following embodiments, and any modifications and / or alterations made to this utility model will fall within the protection scope of this utility model.

[0023] In this invention, unless otherwise specified, all parts and percentages are by weight, and the equipment and raw materials used are commercially available or commonly used in the field. Unless otherwise specified, the methods in the following embodiments are conventional methods in the field. Unless otherwise specified, the components or equipment in the following embodiments are general standard parts or components known to those skilled in the art, and their structures and principles can be learned by those skilled in the art through technical manuals or conventional experimental methods.

[0024] The embodiments of the present invention will be described in detail below with reference to the accompanying drawings. In the following detailed description, many specific details are set forth to facilitate explanation and provide a comprehensive understanding of the embodiments of the present invention. However, one or more embodiments may be practiced by those skilled in the art without these specific details.

[0025] like Figure 1 and Figure 2 As shown, an embodiment of this utility model discloses a cold box with a concave drainage structure. The main body is a large rectangular cold box body 1 welded from steel plates and profiles. The interior of the cold box body 1 is filled with insulating materials such as perlite to maintain the ultra-low temperature operating environment of the internal pipelines and equipment.

[0026] To prevent exceeding height limits during transport, the refrigerated box body 1 is equipped with a concave surface 2 for the centralized installation of multiple valves 4. This concave surface 2 is composed of a concave metal panel with a concave depth of approximately 250 mm, which is formed by sealing and welding to the uprights 3 and crossbeams of the refrigerated box body 1.

[0027] To address the issue of water accumulation on the concave surface 2, the cold box body 1 is equipped with a through-type drainage pipe. The drainage pipe includes a first pipe section 6, a bend 7, and a second pipe section 8. One end of the first pipe section 6 forms a water inlet by creating an opening at the bottom of the concave metal panel, and is circumferentially sealed and welded to the concave metal panel to prevent leakage. The other end of the first pipe section 6 is welded with a 90-degree bend 7, which changes the water flow direction from vertically downward to horizontally outward. The other end of the bend 7 is welded with the second pipe section 8. The second pipe section 8 is installed at an angle of approximately three degrees relative to the horizontal surface. It passes horizontally through the insulation space inside the cold box body 1, and its end extends through the side wall 9 adjacent to the concave surface of the cold box body 1, forming a water outlet to drain water to the outside of the cold box body 1.

[0028] The entire drainage system is made of 304 stainless steel. This material was chosen based on two considerations: First, stainless steel has excellent corrosion resistance and can resist long-term erosion by rainwater; second, since the drainage system runs through the cold box 1, which has an ultra-low temperature environment, a significant cold bridging effect will occur. Stainless steel can still maintain good toughness at low temperatures and will not suffer from low-temperature brittle fracture like carbon steel, thus ensuring the safety and long-term reliability of the structure.

[0029] Multiple valve rings 5 ​​for mounting valves 4 are welded onto the concave surface 2. The inlet of the drain pipe is positioned away from these valve rings 5 ​​to avoid interference during welding or installation of valves 4 and to ensure the integrity of the seal around the valve rings 5. Considering the large width of the concave surface 2, at least two sets of such drain pipes are symmetrically arranged, adjacent to the two side walls 9 of the cold box body 1, respectively, to ensure that there are no dead corners on the entire concave surface 2 and that drainage is more rapid.

[0030] When rainwater or other liquids fall into the concave surface 2, they will collect at the bottom of the concave surface 2 due to gravity. The liquid enters the first pipe section 6 through the inlet, flows through the bend 7, and then flows automatically outward along the inclined second pipe section 8. Finally, it is smoothly discharged to the outside of the cold box body 1 through the outlet provided on the side wall 9, thus keeping the concave surface 2 dry at all times and effectively preventing rust and leakage.

[0031] This article uses specific examples to illustrate the principles and implementation methods of this utility model. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of this utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made to this utility model without departing from the principles of this utility model, and these improvements and modifications also fall within the protection scope of the claims of this utility model.

Claims

1. A cold box with a concave drainage structure, characterized in that: The cold box with a concave drainage structure includes a cold box body (1), the cold box body (1) is provided with a concave surface (2) for installing a valve (4), the cold box body (1) is also provided with a drainage pipe that penetrates the cold box body (1), the drainage pipe has an inlet that communicates with the bottom of the concave surface (2) and an outlet that is provided on the side wall (9) adjacent to the concave surface of the cold box body (1), the drainage pipe is inclined so that the height of the outlet is lower than the height of the inlet; the drainage pipe includes a first pipe section (6) welded to the bottom of the concave surface (2), a bend (7) connected to the end of the first pipe section (6), and a second pipe section (8) connected at one end to the bend (7) and the other end passing through the side wall (9) adjacent to the concave surface of the cold box body (1) to form the outlet.

2. A cold box with a concave drainage structure according to claim 1, characterized in that: The second pipe section (8) is inclined relative to the horizontal plane.

3. A cold box with a concave drainage structure according to claim 1, characterized in that: The drainage pipe is made of stainless steel.

4. A cold box with a concave drainage structure according to claim 1, characterized in that: The cold box body (1) is provided with a concave metal panel, and the concave surface (2) is disposed on the concave metal panel. The surface of the concave metal panel is provided with an opening for sealing and welding with the drainage pipe, and the opening is configured as the water inlet.

5. A cold box with a concave drainage structure according to claim 1, characterized in that: The drainage pipes are provided in at least two sets, and are respectively located adjacent to the two side walls (9) of the cold box body (1).

6. A cold box with a concave drainage structure according to claim 1, characterized in that: The concave surface (2) is also provided with a valve ring (5) for welding with the valve (4), and the water inlet is located on the concave surface (2) away from the valve ring (5).

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