Water vapor partition structure in steel-bushing-steel directly-buried steam heat preservation pipeline well

Abstract

The utility model discloses a water vapor partition structure in a steel-jacket-steel directly-buried steam heat preservation pipeline well, belongs to the field of steam heat preservation pipelines, and solves the problem that a heat insulation layer of the steel-jacket-steel directly-buried steam heat preservation pipeline is easily corroded by water vapor in the well. The well wall sealing device comprises a working pipe, the periphery of the working pipe located on the inner side of the well wall is sleeved with a first outer sheath, a second outer sheath penetrates through the well wall and surrounds the working pipe, and an annular sealing structure is arranged between the first outer sheath and the second outer sheath. A first annular structure is arranged on the outer wall of the working pipe, a second annular structure is arranged on the inner wall of the second outer sheath, and the first annular structure and the second annular structure are connected through a connecting pipe. The first annular structure, the connecting pipe and the second annular structure form an inner partition of the heat insulation layer, the annular sealing structure between the first outer sheath and the second outer sheath serves as an outer partition of the heat insulation layer, the first annular structure and the second annular structure are combined, and water vapor in a well is effectively prevented from entering the heat insulation layer of the steel bushing steel direct burial steam heat preservation pipeline.

Description

Technical Field

[0001] The utility model belongs to the field of steam insulation pipelines, and in particular relates to a water vapor isolation structure in a steel jacketed steel directly buried steam insulation pipeline well. Background Art

[0002] Steel-jacketed direct-buried steam insulated pipes are used to transport high-temperature steam of 200-300 degrees Celsius produced by thermal power plants to steam users for production activities of industrial enterprises or to meet the heating needs of commercial users. The centralized production of high-temperature steam is highly efficient and conducive to the realization of the "double carbon" goals. In order to achieve energy conservation in the steam transportation process, it is necessary to protect the insulation layer of the steel-jacketed direct-buried steam insulated pipes to prevent water vapor from entering the insulation layer of the steel-jacketed direct-buried steam insulated pipes and causing corrosion of the insulation layer.

[0003] Due to construction conditions, the pipes in the valve wells along the steam transmission pipeline are protected by a stainless steel plate protective layer. Due to the high relative humidity in the valve well, water vapor can easily enter the insulation layer of the steel-jacketed steel direct-buried steam insulation pipeline through the gaps in the protective layer in the valve well, causing the insulation layer to become corrupted and damaged. The damage to the insulation layer will cause a large amount of steam heat in the working pipe to be lost to the earth, resulting in abnormal condensation of steam in the working pipe, which greatly reduces the transmission efficiency of the steel-jacketed steel direct-buried steam insulation pipeline and shortens its service life.

[0004] Based on the actual problems in the above projects, it is very necessary to study and design a water vapor isolation structure in a steel-jacketed steel direct-buried steam insulation pipeline well. Utility Model Content

[0005] The utility model aims to provide a water vapor isolation structure for a steel-jacketed steel directly buried steam thermal insulation pipeline in a well, so as to solve the problem that the insulation layer of the steel-jacketed steel directly buried steam thermal insulation pipeline is easily corroded by water vapor in the well.

[0006] The technical solution of the utility model is: a steel-sheathed steel direct-buried steam insulation pipeline well water vapor isolation structure, comprising a working pipe, a first outer sheath is sheathed on the outer periphery of the working pipe located on the inner side of the well wall, a second outer sheath is penetrated through the well wall, the second outer sheath is arranged around the working pipe, an annular sealing structure is arranged between the first outer sheath and the second outer sheath; a first annular structure is arranged on the outer wall of the working pipe, a second annular structure is arranged on the inner wall of the second outer sheath, and the first annular structure and the second annular structure are connected by a connecting pipe.

[0007] As a further improvement of the utility model, the connecting pipe adopts a corrugated pipe.

[0008] As a further improvement of the utility model, the second annular structure includes a first ring plate, a second ring plate and a first short tube. The first ring plate and the second ring plate are connected by bolts and nuts. The first short tube is connected to one side of the second ring plate. The first short tube is connected to the connecting tube, and the first ring plate is connected to the inner wall of the second outer sleeve.

[0009] As a further improvement of the utility model, a heat insulation pad is provided between the first ring plate and the second ring plate, and the bolts penetrate the heat insulation pad.

[0010] As a further improvement of the utility model, a sealing sleeve is provided through the first ring plate, the heat insulation pad and the second ring plate, and the sealing sleeve is sleeved on the outside of the bolt.

[0011] As a further improvement of the utility model, the first annular structure includes a third annular plate and a second short tube, the second short tube is connected to one side of the third annular plate, the second short tube is connected to the connecting tube, and the third annular plate is connected to the outer wall of the working tube.

[0012] As a further improvement of the utility model, the annular sealing structure includes a sealing ring and two limiting ring plates. The sealing ring fits tightly between the first outer sleeve and the second outer sleeve. The two limiting ring plates are respectively arranged on both sides of the sealing ring, and the limiting ring plates are connected to the inner wall of the second outer sleeve.

[0013] As a further improvement of the utility model, a guide bracket is provided between the working pipe located outside the well wall and the second outer sheath.

[0014] The beneficial effects of the utility model are as follows: on the one hand, the utility model designs an inner partition of the insulation layer composed of a first annular structure, a connecting pipe, and a second annular structure; on the other hand, an annular sealing structure between the first outer sheath and the second outer sheath is designed as an outer partition of the insulation layer. The combination of the two effectively prevents water vapor in the well from entering the insulation layer of the steel-sheathed steel direct-buried steam insulated pipeline, thereby protecting the insulation layer and extending the transportation efficiency and service life of the steel-sheathed steel direct-buried steam insulated pipeline. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural schematic diagram of the utility model;

[0016] Figure 2 It is a structural schematic diagram of the second annular structure in the utility model;

[0017] Figure 3 It is a structural schematic diagram of the first annular structure in the utility model;

[0018] Figure 4 It is a structural schematic diagram of the annular sealing structure in the utility model.

[0019] In the figure: 1-working tube; 2-first outer sheath; 3-second outer sheath; 4-annular sealing structure; 41-sealing ring; 42-limiting ring plate; 5-second annular structure; 51-first ring plate; 52-nut; 53-insulating pad; 54-second ring plate; 55-first short tube; 56-bolt; 57-sealing sleeve; 6-first annular structure; 61-third ring plate; 62-second short tube; 7-well wall; 8-guide bracket. DETAILED DESCRIPTION

[0020] The utility model is described in detail below in conjunction with the accompanying drawings.

[0021] like Figure 1-4 As shown, a steel-jacketed steel direct-buried steam insulation pipeline well water vapor isolation structure includes a working pipe 1, a first outer jacket 2 is provided on the outer periphery of the working pipe 1 located on the inner side of the well wall 7, a second outer jacket 3 is provided through the well wall 7, the second outer jacket 3 is arranged around the working pipe 1, and an annular sealing structure 4 is provided between the first outer jacket 2 and the second outer jacket 3; a first annular structure 6 is provided on the outer wall of the working pipe 1, and a second annular structure 5 is provided on the inner wall of the second outer jacket 3, and the first annular structure 6 and the second annular structure 5 are connected by a connecting pipe 9.

[0022] The connecting pipe 9 is a bellows.

[0023] The second annular structure 5 includes a first ring plate 51, a second ring plate 54 and a first short tube 55. The first ring plate 51 and the second ring plate 54 are connected by bolts 56 and nuts 52. The first short tube 55 is welded to one side of the second ring plate 54. The first short tube 55 is welded to the connecting tube 9. The first ring plate 51 is welded to the inner wall of the second outer sheath 3.

[0024] A heat insulation pad 53 is provided between the first ring plate 51 and the second ring plate 54 , and the bolts 56 pass through the heat insulation pad 53 .

[0025] A sealing sleeve 57 is provided through the first ring plate 51 , the heat insulating pad 53 and the second ring plate 54 , and the sealing sleeve 57 is sleeved outside the bolt 56 . The sealing sleeve 57 is used to prevent the bolt 56 from directly contacting the first ring plate 51 and the second ring plate 54 .

[0026] The first annular structure 6 includes a third annular plate 61 and a second short tube 62 . The second short tube 62 is welded to one side of the third annular plate 61 . The second short tube 62 is welded to the connecting tube 9 . The third annular plate 61 is welded to the outer wall of the working tube 1 .

[0027] The annular sealing structure 4 includes a sealing ring 41 and two limiting ring plates 42. The sealing ring 41 fits tightly between the first outer sheath 2 and the second outer sheath 3. The two limiting ring plates 42 are respectively arranged on both sides of the sealing ring 41. The limiting ring plates 42 are connected to the inner wall of the second outer sheath 3.

[0028] A guide bracket 8 is provided between the working pipe 1 located outside the well wall 7 and the second outer jacket 3 .

[0029] The first outer sheath 2 is made of a galvanized iron pipe, and the second outer sheath 3 is made of a steel pipe.

[0030] The sealing ring 41 and the sealing sleeve 57 are both made of polytetrafluoroethylene, and the heat insulating pad 53 is made of ceramic rubber, which not only reduces the thermal conductivity of the utility model, but also realizes effective insulation between the second outer protective tube 3 and the working tube 1.

[0031] The first annular structure 6 is connected to the second annular structure 5 through a connecting pipe 9 to form an inner partition of the insulation layer surrounding the working pipe to ensure reliable separation of the insulation layer; an annular sealing structure 4 is arranged between the first outer jacket 2 and the second outer jacket 3 to form an outer partition of the insulation layer to ensure a tight sealing fit between the first outer jacket 2 and the second outer jacket 3. The combination of the inner partition of the insulation layer and the outer partition of the insulation layer can effectively prevent water vapor in the well from entering the insulation layer of the steel-jacketed steel direct-buried steam insulation pipeline (working pipe 1), solving the problem of reduced pipeline transportation efficiency and shortened service life caused by damage to the insulation layer.

[0032] When the working tube 1 undergoes thermal displacement, the guide bracket 8 guides the displacement of the working tube 1 to ensure the concentricity of the working tube 1 relative to the first outer jacket 2 and the second outer jacket 3; the annular sealing structure 4 slides with the relative displacement between the second outer jacket 3 and the first outer jacket 2. Due to the limiting effect of the limiting ring plate 42, the sealing performance of the sealing ring 41 is ensured when the second outer jacket 3 is displaced relative to the first outer jacket 2; the connecting tube 9 adopts a corrugated tube to reserve space for the second outer jacket 3 to displace relative to the first outer jacket 2.

[0033] The utility model solves the problem that water vapor in the well enters the insulation layer of the steel-jacketed steel direct-buried steam insulation pipeline, causing the insulation layer to become corrupted, damaged and reduce the service life, under the condition of reducing the heat conduction efficiency as much as possible.

Claims

1. A water vapor isolation structure in a steel-jacketed steel directly buried steam insulation pipeline well, including a working pipe, characterized in that: A first outer sheath (2) is provided on the outer periphery of a working pipe (1) located on the inner side of a well wall (7); a second outer sheath (3) is provided penetrating the well wall (7); the second outer sheath (3) is arranged around the working pipe (1); an annular sealing structure (4) is provided between the first outer sheath (2) and the second outer sheath (3); a first annular structure (6) is provided on the outer wall of the working pipe (1); a second annular structure (5) is provided on the inner wall of the second outer sheath (3); and the first annular structure (6) and the second annular structure (5) are connected via a connecting pipe (9).

2. The water vapor isolation structure in the well of the steel-jacketed steel-buried steam insulation pipeline according to claim 1 is characterized by: The connecting pipe (9) is a corrugated pipe.

3. The water vapor isolation structure in the well of the steel-jacketed steel directly buried steam insulation pipeline according to claim 1 or 2, characterized in that: The second annular structure (5) comprises a first annular plate (51), a second annular plate (54) and a first short tube (55); the first annular plate (51) and the second annular plate (54) are connected via bolts (56) and nuts (52); the first short tube (55) is connected to one side of the second annular plate (54); the first short tube (55) is connected to the connecting tube (9); and the first annular plate (51) is connected to the inner wall of the second outer sheath (3).

4. The water vapor isolation structure in the well of the steel-jacketed steel directly buried steam insulation pipeline according to claim 3 is characterized by: A heat insulation pad (53) is provided between the first ring plate (51) and the second ring plate (54), and the bolt (56) passes through the heat insulation pad (53).

5. The water vapor isolation structure in the well of the steel-jacketed steel directly buried steam insulation pipeline according to claim 4 is characterized by: A sealing sleeve (57) is provided through the first ring plate (51), the heat insulation pad (53) and the second ring plate (54), and the sealing sleeve (57) is sleeved on the outside of the bolt (56).

6. The water vapor isolation structure in the well of the steel-jacketed steel-buried steam insulation pipeline according to claim 5 is characterized by: The first annular structure (6) comprises a third annular plate (61) and a second short tube (62), the second short tube (62) being connected to one side of the third annular plate (61), the second short tube (62) being connected to the connecting tube (9), and the third annular plate (61) being connected to the outer wall of the working tube (1).

7. The water vapor isolation structure in a steel-jacketed steel-buried steam insulation pipeline well according to claim 6 is characterized by: The annular sealing structure (4) comprises a sealing ring (41) and two limiting ring plates (42); the sealing ring (41) is tightly fitted between the first outer sheath (2) and the second outer sheath (3); the two limiting ring plates (42) are respectively arranged on both sides of the sealing ring (41); and the limiting ring plates (42) are connected to the inner wall of the second outer sheath (3).

8. The water vapor isolation structure in a steel-jacketed steel directly buried steam insulation pipeline well according to claim 7 is characterized by: A guide bracket (8) is provided between the working pipe (1) located outside the well wall (7) and the second outer jacket (3).

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