A cold box porthole device

Abstract

The utility model discloses a cold box peep hole device relates to industrial equipment detection technical field, is installed in the peep hole department of cold box panel, including peep component and blow -off component, peep component is by first connecting flange, second connecting flan, peep board, sealing element and fastener and is composed, and first connecting flange is connected with cold box panel, and second connecting flange is connected with first connecting flange through fastener, and peep board and sealing element are installed between two connecting flanges, blow -off component includes air pipe, connecting joint and pipe sleeve, and air pipe one end is connected gas source, and the other end is inserted into the cold box and the pipe sleeve is towards peep hole, the utility model discloses can directly observe the pearlite filling state in the cold box, need not integral sand, and the troubleshooting efficiency is greatly improved, and the operation and maintenance cost are reduced, and be applicable to all kinds of cold box equipment.

Description

Technical Field

[0001] This application relates to the field of industrial equipment testing technology, and in particular to a cold box inspection port device. Background Technology

[0002] With the advancement of national energy policies, liquefied natural gas (LNG), as an efficient and clean energy source, is gradually increasing its share in the domestic energy structure, making the technical reliability of its related supporting equipment increasingly important. Cryogenic equipment such as LNG cold boxes, air separation unit cold boxes, and large export ethylene cold boxes are core equipment in the production, storage, and transportation of LNG. These cold boxes integrate a large number of cryogenic operating devices, such as heat exchangers and condensation towers.

[0003] To ensure the normal operation of cryogenic equipment, the interior of the cold box, in addition to the core equipment, needs to be filled with perlite for insulation, structural support, and safety protection. The density of the perlite filling directly affects the insulation effect and structural stability of the cold box: incomplete filling can lead to localized temperature anomalies, pipe frost formation, and other malfunctions, even affecting the normal operation of the entire process. Therefore, accurately determining the perlite filling status within the cold box is a crucial aspect of its operation and maintenance.

[0004] In existing technologies, the detection of the perlite filling status inside a cold box typically involves a complete sand removal inspection: when malfunctions such as frost buildup on pipes or abnormal thermometer readings are found, all the perlite in the cold box must be removed before checking the filling status. This method has significant drawbacks: firstly, the process of removing and refilling perlite is time-consuming, severely impacting production schedules; secondly, sand removal and refilling operations require substantial manpower and resources, resulting in extremely high maintenance costs; furthermore, frequent sand removal and refilling operations may cause unnecessary collision damage to the internal equipment of the cold box. Utility Model Content

[0005] This utility model addresses the aforementioned problems in the existing technology by providing a cold box viewing port device.

[0006] The objective of this utility model is mainly achieved through the following solution:

[0007] A cold box viewing device is installed on the cold box panel, the cold box panel having a viewing hole, the device including a viewing component and an air blowing component;

[0008] The viewing assembly includes a first connecting flange, a second connecting flange, a viewing plate, a seal, and fasteners. Both the first and second connecting flanges have through holes in their middle sections, and one side of the first connecting flange is connected to the viewing hole. The second connecting flange is connected to the other side of the first connecting flange by fasteners. The viewing plate is installed between the first and second connecting flanges, and the space between the viewing plate and the first and second connecting flanges is filled with seals.

[0009] The air blowing assembly includes a vent pipe fixedly installed on the panel of the cold box. One end of the vent pipe is equipped with a connecting joint, and the other end of the vent pipe extends into the cold box panel and is fitted with a sleeve facing the viewing hole. The connecting joint is connected to an air source.

[0010] Preferably, the first connecting flange has a positioning boss on the mating surface of the inspection hole on the cold box panel, and the positioning boss is clearance-fitted with the inner wall of the inspection hole.

[0011] Preferably, the first connecting flange and the second connecting flange are provided with mounting grooves on their corresponding sides, the inspection plate is installed in the mounting grooves, and the front and rear sides of the inspection plate are fitted with seals between the inspection plate and the corresponding mounting grooves.

[0012] Preferably, the sealing element is a sealing gasket made of soft rubber.

[0013] Preferably, the viewing plate is made of soft rubber.

[0014] Preferably, a plurality of fasteners are evenly distributed along the circumference of the first connecting flange and the second connecting flange;

[0015] The fastener includes a locking bolt, a locking nut, and a washer. The bolt head of the locking bolt is fixedly connected to the first connecting flange. The threaded end of the locking bolt passes through the first connecting flange and the second connecting flange in sequence and is fitted with a washer and a locking nut. The locking nut is threadedly connected to the threaded end of the locking bolt.

[0016] Preferably, the vent pipe is a threaded elbow, and the connecting joint is a hexagonal head internal and external threaded joint.

[0017] Preferably, the open end of the sleeve is positioned directly opposite the central axis of the viewing hole.

[0018] Preferably, the first connecting flange is welded and fixed to the viewing hole of the cold box panel.

[0019] In summary, compared with the prior art, the present invention has the following beneficial technical effects:

[0020] (1) The present invention allows direct observation of the filling status of the perlite in the cold box through the viewing component. When the cold box has malfunctions such as pipe frost or abnormal thermometer display, it is not necessary to discharge all the perlite in the cold box. The perlite filling can be quickly confirmed through multiple viewing holes, which significantly shortens the troubleshooting time, saves valuable time for production recovery, and improves overall production efficiency.

[0021] (2) This utility model achieves rapid and accurate installation by setting a positioning boss, limits the viewing plate and sealing parts by the installation groove, and, together with soft rubber sealing gaskets and circumferentially evenly distributed fasteners, ensures excellent overall sealing performance of the device, effectively blocks the leakage of low-temperature gas and perlite dust in the cold box, and avoids the decrease in cold preservation effect and equipment failure caused by leakage.

[0022] (3) The present invention uses an air blowing component to blow away the accumulated perlite inside the viewing hole when the view is blurred due to the accumulation or adhesion of perlite. The air is connected to the factory air source through the connecting joint, and the compressed gas is blown to the inside of the viewing plate through the connecting joint, the air pipe and the sleeve to ensure a clear viewing field and improve the calibration efficiency.

[0023] (4) This utility model reduces operation and maintenance costs and reduces resource waste. The existing overall sand removal and inspection method requires a lot of manpower to carry out sand removal, cleaning and refilling operations. Moreover, perlite will be lost in large quantities during the sand removal process. This device does not require sand removal operations, which can reduce manpower input and avoid perlite loss, thereby reducing operation and maintenance costs. In addition, reducing sand removal operations can also avoid the impact of perlite dust on the environment and operators, and improve the safety and environmental protection of operation and maintenance operations. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the structure of this utility model;

[0025] Figure 2 This is an installation diagram of this utility model;

[0026] Figure 3 This is an exploded view of the viewing component in this utility model.

[0027] Reference numerals: 1-Cold box panel, 2-First connecting flange, 3-Second connecting flange, 4-Inspection plate, 5-Seal, 6-Through hole, 7-Vent pipe, 8-Connecting joint, 9-Pipe sleeve, 10-Positioning boss, 11-Mounting groove, 12-Locking bolt, 13-Locking nut, 14-Gasket. Detailed Implementation

[0028] 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.

[0029] like Figure 1-3 As shown, this utility model discloses a technical solution: a cold box viewing hole device, which is installed on the cold box panel 1. The cold box panel 1 has a viewing hole. The device includes a viewing component and an air blowing component.

[0030] The inspection assembly includes a first connecting flange 2, a second connecting flange 3, an inspection plate 4, a seal 5, and fasteners. Both the first connecting flange 2 and the second connecting flange 3 are made of 304 stainless steel, with a through hole 6 running through the center. A positioning boss 10 is integrally formed on the mating surface of the first connecting flange 2 and the inspection hole of the cold box panel 1. The positioning boss 10 has a clearance fit with the inner wall of the inspection hole (1mm). The first connecting flange 2 is fixed to the inspection hole of the cold box panel 1 by argon arc welding. This welding method ensures a firm connection between the first connecting flange 2 and the cold box panel 1, enabling it to withstand pressure and temperature changes within the cold box and preventing loosening or leakage during long-term use, thus improving the overall stability and service life of the device. The positioning boss 10 allows for quick positioning and installation of the first connecting flange 2 and the cold box panel 1, ensuring precise alignment of the through hole 6 of the first connecting flange 2 with the inspection hole, improving installation efficiency. Simultaneously, the clearance fit structure avoids hard friction between the positioning boss 10 and the inner wall of the inspection hole during installation, protecting the component surface and facilitating subsequent welding and fixing operations.

[0031] The first connecting flange 2 and the second connecting flange 3 each have a mounting groove 11 on their corresponding sides. The inspection plate 4 is installed in the mounting groove 11. The inspection plate 4 is made of aluminosilicate glass, which has excellent properties such as high temperature resistance, pressure resistance, and wear resistance, and can adapt to the complex working conditions inside the cold box. At the same time, its high light transmittance ensures that the operator can clearly observe the filling status of the perlite inside the cold box, meeting the core requirements of the inspection function. The sealing element 5 is made of soft rubber gasket, which is installed between the front and rear sides of the inspection plate 4 and the mounting groove 11. The soft rubber material has excellent low temperature resistance and can adapt to the low temperature working conditions inside the cold box, avoiding sealing failure due to low temperature embrittlement. The mounting groove 11 can limit and fix the inspection plate 4 and the sealing element 5, preventing the inspection plate 4 from shifting during use, while increasing the installation contact area of ​​the sealing element 5 and improving the sealing performance. In addition, the structure of the mounting groove 11 can make the sealing element 5 evenly stressed under the locking force of the fasteners, avoiding the problem of local sealing failure.

[0032] Eight fasteners are evenly distributed around the circumference of the first connecting flange 2 and the second connecting flange 3. The fasteners include M14 locking bolts 12, locking nuts 13, and washers 14. The bolt head of the locking bolt 12 is welded and fixed to the first connecting flange 2. The threaded end of the locking bolt 12 passes through the first connecting flange 2 and the second connecting flange 3 in sequence, and then the washer 14 is fitted on it. Finally, it is threadedly connected to the locking nut 13. The locking and fixing of the first connecting flange 2 and the second connecting flange 3 is achieved by tightening the locking nut 13. The washer 14 is made of stainless steel.

[0033] The air blowing assembly includes an air pipe 7, a connecting joint 8, and a sleeve 9. The air pipe 7 is a DN20 stainless steel threaded elbow, the connecting joint 8 is a DN20 hexagonal internal and external threaded joint, and the sleeve 9 is made of stainless steel. One end of the air pipe 7 is threaded to the connecting joint 8, and the other end extends into the cold box panel 1 and is welded or threaded to the sleeve 9. The open end of the sleeve 9 is directly opposite the central axis of the inspection hole, which ensures that the air blown out by the air source through the air pipe 7 and the sleeve 9 is accurately applied to the inspection hole area, quickly removing the perlite adhering to the inside of the inspection plate 4, ensuring a clear field of vision, and improving the accuracy of observation. The connecting joint 8 is connected to a compressed air source (air source pressure is 0.4-0.6MPa).

[0034] The present invention provides a cold box inspection hole device, the working principle of which is as follows: when the cold box is running normally or during shutdown inspection, the operator can directly observe the filling height and uniformity of the perlite inside the cold box through the inspection plate 4.

[0035] If the view is obstructed by the perlite adhering to the inner surface of the viewing plate 4, a cleaning procedure can be performed: Connect the factory's clean compressed air (or nitrogen) hose to the connector 8 and briefly open the air supply valve. The compressed gas will pass sequentially through the connector 8 and the vent pipe 7, finally exiting from the sleeve 9, forming a directional airflow that blows towards the inner surface of the viewing plate 4. This airflow will blow away the accumulated perlite, restoring the viewing plate 4 to its transparency, thus allowing a clear view of the interior of the cold box.

[0036] By inspecting multiple preset locations within the cold box using this device, the filling quality of the perlite inside the entire cold box can be efficiently and comprehensively evaluated, providing an intuitive basis for equipment maintenance and fault diagnosis.

[0037] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A viewing device for a cold box, installed on a cold box panel (1), wherein a viewing hole is provided on the cold box panel (1), characterized in that, The device includes a viewing component and an air blowing component; The viewing assembly includes a first connecting flange (2), a second connecting flange (3), a viewing plate (4), a seal (5), and fasteners. The first connecting flange (2) and the second connecting flange (3) are both provided with through holes (6) in the middle. One side of the first connecting flange (2) is connected to the viewing hole. The second connecting flange (3) is connected to the other side of the first connecting flange (2) by fasteners. The viewing plate (4) is installed between the first connecting flange (2) and the second connecting flange (3). The viewing plate (4) is filled with seals (5) between itself and the first connecting flange (2) and the second connecting flange (3). The air blowing assembly includes a vent pipe (7) fixedly installed on the cold box panel (1). One end of the vent pipe (7) is equipped with a connecting joint (8), and the other end of the vent pipe (7) extends into the cold box panel (1) and is equipped with a sleeve (9) facing the viewing hole. The connecting joint (8) is connected to the air source.

2. The cold box viewing port device according to claim 1, characterized in that: The first connecting flange (2) is provided with a positioning boss (10) on the mating surface of the viewing hole on the cold box panel (1), and the positioning boss (10) is clearance-fitted with the inner wall of the viewing hole.

3. The cold box viewing port device according to claim 2, characterized in that: The first connecting flange (2) and the second connecting flange (3) are provided with mounting grooves (11) on their respective sides. The viewing plate (4) is installed in the mounting groove (11), and the front and rear sides of the viewing plate (4) are provided with seals (5) between the corresponding mounting grooves (11).

4. A cold box viewing port device according to claim 3, characterized in that: The sealing element (5) is a sealing gasket, and the material of the sealing gasket is soft rubber.

5. A cold box viewing port device according to claim 1, characterized in that: The viewing plate (4) is made of soft rubber.

6. A cold box viewing port device according to claim 1, characterized in that: The fasteners are evenly distributed in multiples along the circumference of the first connecting flange (2) and the second connecting flange (3); The fasteners include a locking bolt (12), a locking nut (13), and a washer (14). The bolt head of the locking bolt (12) is fixedly connected to the first connecting flange (2). The threaded end of the locking bolt (12) passes through the first connecting flange (2) and the second connecting flange (3) in sequence and is fitted with a washer (14) and a locking nut (13). The locking nut (13) is threadedly connected to the threaded end of the locking bolt (12).

7. A cold box viewing port device according to claim 1, characterized in that: The vent pipe (7) is a threaded elbow, and the connecting joint (8) is a hexagonal head internal and external threaded joint.

8. A cold box viewing port device according to claim 7, characterized in that: The opening end of the sleeve (9) is positioned directly opposite the central axis of the viewing hole.

9. A cold box viewing port device according to claim 2, characterized in that: The first connecting flange (2) is welded and fixed to the viewing hole of the cold box panel (1).

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