Air separation cold box penetrating pipe sealing structure

Abstract

The utility model relates to a pipe penetrating sealing structure of an air separation cold box, which comprises the air separation cold box and a pipe penetrating pipeline, a through hole is arranged on the air separation cold box, the pipe penetrating pipeline is inserted into the through hole, a sealing device is arranged in a channel between the air separation cold box and the pipe penetrating pipeline, and the sealing device comprises a sealing cylinder and a sealing ring. Wherein the sealing cylinder is welded at the position of the through hole and located on a cold box plate on the inner side of the air separation cold box, a certain gap is reserved between the pipe penetrating pipeline and the sealing cylinder after the pipe penetrating pipeline is inserted into the through hole, a sealing ring is placed in the gap and fixed through a fastener, and the fastener is fixed on the outer side of the air separation cold box. Pipeline compensation at the pipe penetrating position of the cold box is simplified, pipeline resistance is reduced, it is guaranteed that liquid products can meet the process requirement when entering the storage tank, and therefore the material consumption of the whole cold box steel structure and the occupied area of the cold box are reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of air separation equipment and relates to a pipe-penetrating sealing structure for an air separation cold box. Background Art

[0002] The air separation cold box pipe penetration sealing structure is applied to the scope of air separation equipment. Air separation equipment is used in the fields of steel, chemical industry, energy, aerospace, etc. The traditional air separation cold box pipe penetration sealing structure is a fixed form in which the pipe is directly welded to the pressure plate attached to the outer surface of the cold box plate, and a flat gasket is placed between the pressure plate and the cold box plate. The air separation cold box is a low-temperature equipment. The medium temperature in the pipe in the cold box can reach -196℃ at the lowest. Such special conditions lead to the need to compensate for the pipe design at the position of entering and exiting the cold box when designing the pipe in the air separation cold box, which increases the pipe resistance and affects the pressure of the liquid product entering the storage tank, occupies part of the cold box space, and causes the cold box to become larger. However, the pipe and the pressure plate of the utility model patent itself are not welded, but only compressed by the sealing material, which can ensure the sealing of the cold box while the pipe axially moves freely. A simpler piping solution can be provided when designing the pipeline. For this reason, a pipe penetration sealing structure for an air separation cold box is designed. Utility Model Content

[0003] The purpose of the utility model is to overcome the shortcomings of the prior art and provide an air separation cold box pipe penetration sealing structure that can prevent the cold of the cold box from overflowing, seal the cold box pipe penetration, simplify the pipe layout at the pipe penetration, and facilitate disassembly and maintenance, thereby ensuring the long-term stable operation of the air separation equipment and solving practical engineering problems. The utility model simplifies the pipe compensation at the cold box pipe penetration, reduces the pipe resistance, ensures that the liquid product entering the storage tank can meet the process requirements, reduces the space occupied by the pipe compensation in the cold box, and thus reduces the material consumption of the entire cold box steel structure and the size of the cold box.

[0004] The utility model is realized through the following technical scheme: an air-separation cold box through-tube sealing structure, which comprises an air-separation cold box and a through-tube pipeline, a through hole is opened on the air-separation cold box, the through-tube pipeline is inserted into the through hole, a sealing device is also installed in the channel between the air-separation cold box and the through-tube pipeline, the sealing device is a sealing cylinder and a sealing ring, wherein the sealing cylinder is welded to a cold box plate located on the inner side of the air-separation cold box at the through hole, a certain gap is left between the through-tube pipeline inserted into the through hole and the sealing cylinder, a sealing ring is placed between the gap, the sealing ring is fixed by a fastener, and the fastener is fixed to the outer side of the air-separation cold box.

[0005] Preferably, the sealing cylinder has a circle of bosses on one axial side inwardly, which makes the entire sealing cylinder cross-section into an L-shaped structure. When the pipe is in contact with the sealing cylinder, a certain gap is formed between the top of the boss and the pipe, and a sealing ring is also inserted in the gap for sealing.

[0006] Preferably, the sealing ring is provided with two pieces, namely an outer sealing gasket and an inner sealing gasket, both of which are conical structures, and the conical ends thereof fit together, and are placed between the gaps of the through hole, the sealing cylinder, and the boss to press the pipe and the sealing cylinder to form a sealing effect. The outer sealing gasket is also provided with a sealing clamping ring edge, which is fixed by clamping the ring edge with fasteners.

[0007] Preferably, the fastener is composed of a pressing plate and a fastening device, one end of the pressing plate presses a pressing ring edge provided on the outer sealing ring, and the other end is fastened by the fastening device.

[0008] One side of the fastener is welded to the cold box plate, passes through the pressure plate, and is pressed together with a sealing ring by a nut and a gasket at the other end.

[0009] Preferably, the fastening device is a threaded column, which is welded to the cold box plate outside the air separation cold box. The pressure plate passes through the threaded column and is then tightened and fixed by screwing with a nut.

[0010] Preferably, the pressure plate is further provided with a threaded through hole, in which a disassembly nut is installed. The disassembly nut is rotated into the pressure plate, and its end touches the cold box plate outside the air separation cold box. When disassembling, the pressure plate can be lifted up by continuing to tighten the disassembly nut to facilitate disassembly.

[0011] Compared with the prior art, the utility model has the following beneficial effects:

[0012] 1. The utility model provides an air separation cold box pipe penetration sealing structure, which simplifies the pipe compensation at the cold box pipe penetration point, reduces the pipe resistance, ensures that the liquid product entering the storage tank can meet the process requirements, reduces the space occupied by the pipe compensation in the cold box, and thus reduces the material consumption of the entire cold box steel structure and the size of the cold box;

[0013] 2. The pipe at the pipe penetration point of the air separation cold box designed by the utility model can reduce the influence of low temperature on the axial load of the pipe penetration and directly pass through the cold box;

[0014] 3. The overall structure of the utility model is compact, and the design is simple and safe;

[0015] 4. The material of the utility model is conventional, easy to purchase, and convenient to disassemble and replace. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of the utility model. DETAILED DESCRIPTION

[0017] In order to enable ordinary technicians in the field to more clearly understand the purpose, technical solutions and advantages of the utility model, the utility model is further explained below in conjunction with the accompanying drawings and embodiments.

[0018] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by terms such as "upper", "lower", "left", "right", "inner", "outer", "horizontal" and "vertical" are based on the directions or positional relationships shown in the accompanying drawings and are only for the convenience of describing the present invention. They do not indicate or imply that the device or component referred to must have a specific direction and therefore should not be understood as a limitation on the present invention.

[0019] The utility model will be described in detail below with reference to the accompanying drawings: Figure 1 As shown, an air-separation cold box through-tube sealing structure includes an air-separation cold box and a through-tube pipe 1. A through hole 2 is provided on the air-separation cold box, and the through-tube pipe 1 is inserted into the through hole. A sealing device is also installed in the passage between the air-separation cold box and the through-tube pipe 1. The sealing device is a sealing cylinder 3 and a sealing ring 4. The sealing cylinder 3 is welded on the cold box plate 5 located on the inner side of the air-separation cold box at the through hole 2. A certain gap is left between the through-tube pipe 1 inserted into the through hole 2 and the sealing cylinder 3. A sealing ring 4 is placed between the gaps. The sealing ring 4 is fixed by a fastener, and the fastener is fixed on the outer side of the air-separation cold box. The sealing cylinder 3 has a circle of bosses 8 on one side of the axial direction inward. The bosses 8 make the cross section of the entire sealing cylinder 3 into an L-shaped structure. When the through-tube pipe 1 contacts the sealing cylinder 3, a certain gap is formed between the top of the boss 8 and the through-tube pipe 1, and the sealing ring 4 is inserted between the gaps for sealing. The sealing ring 4 is provided with two pieces, namely an outer sealing gasket 6 and an inner sealing gasket 7, both of which are conical structures, and the conical ends thereof fit each other. The sealing ring 4 is placed between the gap between the pipe 1 and the sealing cylinder 3 to press the pipe 1 and the sealing cylinder 3 to form a sealing effect. The outer sealing gasket 6 is also provided with a sealing clamping ring edge 9, which is fixed by clamping the ring edge with a fastener.

[0020] The fastener 14 is composed of a pressing plate 10 and a fastening device. One end of the pressing plate 10 presses the clamping ring edge 9 opened on the outer sealing ring 6, and the other end is fastened by the fastening device. One side is welded to the cold box plate, passes through the pressing plate 10, and the other end is combined with the nut gasket 11 to clamp the sealing ring. The fastening device is a threaded column 12, which is welded to the cold box plate outside the air separation cold box. The pressing plate 10 passes through the threaded column 12, and then is screwed and fixed by the nut 13.

[0021] The pressure plate is also provided with a threaded through hole 16, in which a disassembly nut 15 is installed. The disassembly nut 15 is rotated into the pressure plate 10, and its end touches the cold box plate 5 outside the air separation cold box. When disassembling, the pressure plate can be lifted up by continuing to screw on the disassembly nut to facilitate disassembly.

[0022] Due to the low temperature characteristics of the cold box, it is necessary to use insulation materials (generally pearl sand) for insulation. In order to prevent the internal insulation material from overflowing the cold box when the air separation cold box is passed through the pipe, a sealing structure is required at the cold box pipe passing point. The pipe from the cold box passes through the center of the entire structure to the outside of the cold box through the inner sealing gasket, the outer sealing gasket and the pressure plate. The sealing cylinder is welded to the reserved hole of the cold box plate, and the inner sealing gasket and the outer sealing gasket in the sealing cylinder are stacked to form a sealing ring combination. The outer side of the inner sealing gasket fits the inner wall of the sealing cylinder and the sealing cylinder boss. The inner wall straight edge section of the inner sealing gasket fits the outer wall of the pipe passing through the cold box. The conical outer wall of the outer sealing gasket fits the conical inner wall of the inner sealing ring, and the inner wall of the outer sealing gasket fits the pipe passing through the cold box. The pressure plate presses on the upper edge of the ring edge of the outer straight edge section of the outer sealing gasket and covers the outer side of the cold box plate. The fastener bolts welded on the cold box plate pass through the pressure plate, and the fastener nuts are tightened to adjust the tightness of the pressure plate, thereby achieving a sealing effect. When the inner and outer sealing gaskets are aged, damaged, and difficult to remove, use the disassembly bolts to lift the pressure plate for easy replacement.

[0023] It is worth noting that the inner and outer sealing gaskets are only for illustration purposes. In actual use, they can be replaced with other sealing materials suitable for low temperature conditions according to the use conditions. To ensure the sealing performance, the pipes, pressure plates and sealing cylinders of the air separation cold box need to extrude the sealing materials. The sealing materials here should have good compressibility. The height of the sealing cylinder can be adjusted according to the actual use conditions, but the shortest cannot be less than 100mm.

[0024] The distance between the inner edge of the central opening of the pressure plate and the outer wall of the air separation cold box pipe is determined according to the results of the pipeline flexibility analysis. If there is no requirement, it can be determined according to the actual project, but this distance cannot be 0.

[0025] The traditional sealing form is the form of welding the pipe and the pressure plate. The sealing structure designed by the utility model is easy to disassemble and assemble, and convenient to repair. While providing good sealing performance, it can also simplify the pipeline design and reduce pipeline resistance. It greatly improves the service life of pipeline equipment, reduces the accident rate of pipeline cracking, and is safer and more stable to use.

[0026] The specific embodiments described herein are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Anyone familiar with the technology may modify or change the above embodiments without violating the spirit and scope of the present invention. Therefore, all equivalent modifications or changes made by a person of ordinary skill in the art without departing from the spirit and technical ideas disclosed in the present invention shall still be covered by the claims of the present invention.

Claims

1. An air separation cold box pipe-penetrating sealing structure, comprising an air separation cold box and a pipe-penetrating pipeline, a through hole is provided on the air separation cold box, the pipe-penetrating pipeline is inserted into the through hole, and a sealing device is also installed in the channel between the air separation cold box and the pipe-penetrating pipeline, characterized in that: The sealing device is a sealing cylinder and a sealing ring, wherein the sealing cylinder is welded to the cold box plate located on the inner side of the air separation cold box at the through hole, a certain gap is left between the pipe inserted into the through hole and the sealing cylinder, a sealing ring is placed between the gaps, and the sealing ring is fixed by a fastener, and the fastener is fixed to the outer side of the air separation cold box.

2. The air separation cold box pipe sealing structure according to claim 1 is characterized in that: The sealing cylinder has a circle of bosses on one axial side inward, which makes the entire sealing cylinder cross-section into an L-shaped structure. When the pipe is in contact with the sealing cylinder, a certain gap is formed between the top of the boss and the pipe, and a sealing ring is also inserted in the gap for sealing.

3. The air separation cold box pipe sealing structure according to claim 2 is characterized in that: The sealing ring is provided with two pieces, namely an outer sealing gasket and an inner sealing gasket, both of which are conical structures, and the conical ends thereof fit together. They are placed between the through hole, the sealing cylinder and the gap of the boss to press the pipe through-tube and the sealing cylinder to form a sealing effect. The outer sealing gasket is also provided with a sealing clamping ring edge, which is fixed by clamping the ring edge with fasteners.

4. The air separation cold box pipe sealing structure according to claim 3 is characterized in that: The fastener is composed of a pressing plate and a fastening device. One end of the pressing plate presses the clamping ring edge opened on the outer sealing ring, and the other end is fastened by the fastening device. One side of the fastening device is welded to the cold box plate, passes through the pressure plate, and is combined with a sealing ring by a nut and a gasket at the other end.

5. The air separation cold box pipe sealing structure according to claim 4 is characterized in that: The fastening device is a threaded column, which is welded to the cold box plate outside the air separation cold box. The pressure plate passes through the threaded column and is then tightened and fixed by screwing with a nut.

6. The air separation cold box pipe sealing structure according to claim 5 is characterized in that: The pressure plate is also provided with a threaded through hole, in which a disassembly nut is installed. The disassembly nut is rotated into the pressure plate, and its end touches the cold box plate outside the air separation cold box. When disassembling, the pressure plate is lifted up by continuing to tighten the disassembly nut for easy disassembly.

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