Efficient anti-frost device of air separation plant cold box
By installing gas delivery pipes and detectors inside the cold box of the air separation unit and using inert gas filling, the problems of frost and cold box volume reduction are solved, achieving efficient anti-frost and anti-collapse effects.
Patent Information
- Application Number
- CN202520225349.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-13
- Publication Date
- 2026-02-10
- Estimated Expiration
- 2035-02-13
AI Technical Summary
Existing air separation equipment cold boxes are prone to allowing outside humid air to enter during low-temperature gas transportation due to poor sealing, resulting in frost formation and affecting normal equipment use. At the same time, a tight seal may cause the cold box to collapse.
A gas delivery pipe, a gas pressure detector, and a gas concentration monitor are installed inside the cold box. Inert gas is used to fill the inside of the cold box. These devices monitor and control the concentration and pressure of the inert gas to maintain pressure balance inside and outside the cold box and prevent humid air from entering.
It effectively prevents frost formation, avoids shrinkage of the cold box and collapse caused by poor sealing, and simplifies the equipment and reduces costs.
Smart Images
Figure CN223896365U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of cold box technology for air separation equipment, specifically a high-efficiency anti-frost device for cold boxes of air separation equipment. Background Technology
[0002] In the process of transporting cryogenic gases (liquid nitrogen, liquid oxygen, etc.), in order to prevent the absorption of external heat in the transport pipeline and thus prevent heat loss, the transport pipeline is usually arranged in an air separation cold box. The air separation cold box is equipped with perlite, which can effectively block the cryogenic gas from exchanging heat with the outside world and play a good role in keeping it cold.
[0003] In existing air separation equipment, the cold box only uses perlite for insulation when transporting cold medium gas. When the cold box is cooled, the internal gas volume shrinks, creating negative pressure. If the cold box is tightly sealed, it may collapse and deform under external air pressure. If the seal is not tight, humid air may enter, causing the perlite to become damp, thus affecting the insulation effect of the material. Furthermore, the humid air may freeze inside, affecting the normal operation of the equipment.
[0004] Therefore, in view of this, we have studied and improved the existing structure to propose a high-efficiency anti-frost device for the cold box of air separation equipment. Utility Model Content
[0005] The purpose of this invention is to provide a high-efficiency anti-frost device for the cold box of an air separation unit, so as to solve the problems mentioned in the background art.
[0006] To achieve the above objectives, this utility model provides the following technical solution: a high-efficiency anti-frost device for a cold box of an air separation unit, comprising a cold box shell, wherein the same cold medium pipe is fixedly installed through the left and right sides of the surface of the cold box shell, gas delivery pipes are fixedly installed through the left and right sides of the outer surface of the cold box shell, gas pressure detectors are fixedly installed on the upper and lower sides of the inner surface of the cold box shell, and gas concentration detectors are fixedly installed on the left and right sides of the inner surface of the cold box shell.
[0007] Preferably, the interior of the cold box shell is filled with perlite, and a solenoid valve is installed on the surface of the gas delivery pipe.
[0008] Preferably, one gas delivery pipe is located in the middle of the left side of the cold box shell, and two gas delivery pipes are located on the right side of the cold box shell, arranged vertically.
[0009] Preferably, two gas concentration monitors are arranged vertically on the left side of the inner surface of the cold box shell, and one gas concentration monitor is arranged in the middle of the right side of the inner surface of the cold box shell.
[0010] Preferably, the cold medium pipeline is configured in a "Z" shape, and the section of the cold medium pipeline located inside the cold box shell is covered with perlite.
[0011] Compared with the prior art, the beneficial effects of this utility model are:
[0012] 1. This utility model, through the setting of a gas delivery pipe, a gas pressure detector, and a gas concentration monitor, uses the gas delivery pipe to fill the inside of the cold box shell with inert gas, filling the gaps in the perlite with inert gas. The gas pressure detector and the gas concentration monitor measure the concentration of the inert gas and the pressure inside the cold box shell to determine the amount of inert gas filling. This ensures that the pressure inside and outside the cold box shell can remain balanced during cooling and contraction, and avoids residual air remaining in the perlite. This prevents the gas volume inside the cold box shell from shrinking due to low temperature, which could cause the box to collapse. It also makes it difficult for external humid air to invade and cause the insulation material to become damp, thus preventing frost formation inside the cold box and effectively avoiding frost damage to the device.
[0013] 2. This utility model can prevent frost without the need for additional devices, making it more efficient and convenient to use, and also cheaper, making it suitable for widespread use. Furthermore, the arrangement of the gas delivery pipe and the gas concentration monitor ensures that the inert gas is fully and evenly filled and accurately detected. Attached Figure Description
[0014] Figure 1 This is a schematic diagram of the overall three-dimensional structure of the present invention;
[0015] Figure 2 This is a schematic diagram of the overall frontal sectional structure of this utility model.
[0016] In the diagram: 1. Cold box shell; 2. Cold medium pipeline; 3. Gas delivery pipe; 4. Gas pressure detector; 5. Gas concentration monitor; 6. Solenoid valve; 7. Perlite. Detailed Implementation
[0017] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.
[0018] like Figures 1-2As shown, a high-efficiency anti-frost device for a cold box of an air separation unit includes a cold box shell 1. A cold medium pipe 2 is fixedly installed through the left and right sides of the surface of the cold box shell 1. A gas delivery pipe 3 is fixedly installed through the left and right sides of the outer surface of the cold box shell 1. A gas pressure detector 4 is fixedly installed on the upper and lower sides of the inner surface of the cold box shell 1. A gas concentration detector 5 is fixedly installed on the left and right sides of the inner surface of the cold box shell 1.
[0019] One gas delivery pipe 3 is located in the middle of the left side of the cold box shell 1, and two gas delivery pipes 3 are located on the right side of the cold box shell 1, arranged vertically.
[0020] Two gas concentration monitors 5 are arranged vertically on the left side of the inner surface of the cold box shell 1, and one gas concentration monitor 5 is arranged in the middle of the right side of the inner surface of the cold box shell 1.
[0021] The gas pressure detector 4 is a Sinomeasure model "sin-PM800".
[0022] The gas concentration monitor 5 is branded as Erannetex and model number "MIC-500S-N2O4".
[0023] By adopting the above technical solution, inert gas is filled into the cold box shell 1 through the gas delivery pipe 3, and the gaps between the perlite 7 are filled with inert gas. The concentration of the inert gas and the internal pressure of the cold box shell 1 are measured by the gas pressure detector 4 and the gas concentration monitor 5 to determine the amount of inert gas filling. This ensures that the internal and external pressures of the cold box shell 1 can be kept in balance during cooling and contraction, and avoids residual air in the perlite 7. This prevents the gas volume inside the cold box shell 1 from shrinking due to low temperature, which could cause the box to collapse. It also makes it difficult for external humid air to invade and cause the insulation material to become damp. This can prevent frost formation inside the cold box and effectively avoid frost in the device.
[0024] The arrangement of the gas delivery pipe 3 and the gas concentration monitor 5 ensures that the inert gas is fully filled inside the cold box shell 1, and that the filling amount is accurately detected.
[0025] Furthermore, the interior of the cold box shell 1 is filled with perlite 7, and a solenoid valve 6 is installed on the surface of the gas delivery pipe 3.
[0026] The cold medium pipe 2 is set in a "Z" shape, and the section of the cold medium pipe 2 located inside the cold box shell 1 is covered by perlite 7.
[0027] By adopting the above technical solution, perlite 7 can keep the cold medium pipeline 2 cold;
[0028] The opening and closing state of the gas delivery pipe 3 can be controlled by the solenoid valve 6.
[0029] Working Principle: When using the high-efficiency anti-frost device for the cold box of this air separation equipment, firstly, open the solenoid valve 6 to inject inert nitrogen gas into the cold box shell 1. The nitrogen gas injection will fill the gaps filled by the perlite 7. The concentration of the inert gas and the internal pressure of the cold box shell 1 are measured using the gas pressure detector 4 and the gas concentration monitor 5 to determine the amount of inert gas filling. After filling is completed, close the solenoid valve 6 to seal the gas delivery pipe 3. When the cold medium gas is transported through the cold medium pipeline 2, the perlite 7 will provide insulation to prevent heat exchange and ensure temperature stability. Under the pressure of the inert gas, the entire cold box shell 1 can maintain positive pressure inside and outside even when it is cold, preventing the gas volume inside the cold box shell 1 from shrinking due to low temperature, which would cause the box to collapse. At the same time, it also makes it difficult for external humid air to invade and cause the insulating material perlite 7 to become damp. This prevents humid air from forming frost inside the cold box, thus effectively preventing the equipment from freezing. This is the working principle of the high-efficiency anti-frost device for the cold box of this air separation equipment.
Claims
1. A high-efficiency anti-frost device for a cold box of an air separation unit, comprising a cold box shell (1), characterized in that, The same cold medium pipe (2) is fixedly installed through the left and right sides of the surface of the cold box shell (1). Gas delivery pipes (3) are fixedly installed through the left and right sides of the outer surface of the cold box shell (1). Gas pressure detectors (4) are fixedly installed on the upper and lower sides of the inner surface of the cold box shell (1). Gas concentration detectors (5) are fixedly installed on the left and right sides of the inner surface of the cold box shell (1).
2. The high-efficiency anti-frost device for the cold box of an air separation unit according to claim 1, characterized in that, The interior of the cold box shell (1) is filled with perlite (7), and a solenoid valve (6) is installed on the surface of the gas delivery pipe (3).
3. The high-efficiency anti-frost device for the cold box of an air separation unit according to claim 1, characterized in that, One gas delivery pipe (3) is located in the middle of the left side of the cold box shell (1), and two gas delivery pipes (3) are located on the right side of the cold box shell (1) and are arranged vertically.
4. The high-efficiency anti-frost device for the cold box of an air separation unit according to claim 1, characterized in that, Two gas concentration monitors (5) are arranged vertically on the left side of the inner surface of the cold box shell (1), and one gas concentration monitor (5) is arranged in the middle of the right side of the inner surface of the cold box shell (1).
5. The high-efficiency anti-frost device for the cold box of an air separation unit according to claim 1, characterized in that, The cold medium pipe (2) is set in a "z" shape, and the section of the cold medium pipe (2) inside the cold box shell (1) is covered by perlite (7).