Two-way operation structure for preventing water attack at pi-shaped bend of steam pipe network pipeline

Abstract

The utility model relates to a bidirectional-operation structure for preventing water attack at a pi-bend of a pipeline of a steam pipe network, in particular to the technical field of steam pipe networks. The steam pipeline comprises the steam pipeline and the steam trap valves, the steam trap valves are additionally arranged at the pi-shaped bent position of the steam pipeline, and the four steam trap valves are correspondingly arranged at the front end of the first bent position, the rear end of the second bent position, the front end of the third bent position and the rear end of the fourth bent position of the steam pipeline respectively. The steam condensate can be discharged in time in the steam heating process of the steam pipeline running in the opposite direction, the steam condensate is prevented from being gathered, the water attack phenomenon is prevented, the strength of the steam pipeline is greatly improved through the arrangement of the first anti-aging layer and the second anti-aging layer, and the service life of the steam pipeline is prolonged. The first anti-aging layer is formed by winding glass fiber yarns impregnated with polyurethane on the outer surface of the steam pipeline, and the second anti-aging layer is formed by winding glass fiber yarns impregnated with polyurethane on the outer surface of the second transition layer, so that the pressure resistance and tear resistance of the steam pipeline are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of steam pipe networks, in particular to a structure for preventing water hammer at a π bend of a steam pipe network line running in a bidirectional manner. Background Art

[0002] Steam is widely used in the petrochemical industry. It provides heat source for separation tower reboiler to further separate and purify materials, provides power for turbine to drive compressor, and even can be used as reaction terminator, etc. However, there are also risks when using steam. If you are not careful, it may cause huge safety hazards. The traditional design concept is to design a steam trap before the π bend in the steam supply direction (such as Figure 1 As shown in the figure, the possibility of bidirectional operation of the steam network is not fully considered. In the early stage of the operation of large-scale chemical industry equipment, the steam network may be reversely heated. During the process of steam heating, the steam pipeline running in the reverse direction changes from the original high point to the low point. The lack of a low-point steam trap makes it difficult to discharge the steam condensate in time. The steam condensate accumulates, resulting in the inability to discharge the steam condensate in time. After a period of time, the pipe heating is assumed to be over, and the steam volume is increased to increase the pressure and temperature. At this time, a large amount of water is driven by the airflow to form a water hammer phenomenon. Once the water hammer is formed, it is not immediately eliminated to form resonance, and the repeated impact on the steam network causes sudden stress changes in the network and causes pipeline displacement. Some chemical companies even cause steam pipelines to tear and large-scale displacement of pipelines due to water hammer, resulting in damage to the adjacent material pipelines, which in turn causes large-scale shutdown of production equipment. Utility Model Content

[0003] (1) Technical solution

[0004] In order to solve the above technical problems, the utility model provides a structure for preventing water hammer at the π bend of a bidirectional steam pipe network pipeline, including a steam pipe and a steam trap, the steam pipe is π-shaped and is provided with a first bend, a second bend, a third bend, and a fourth bend from one end to the other end, the number of the steam traps is 4 and they are respectively arranged at the front end of the first bend of the steam pipe, the rear end of the second bend, the front end of the third bend and the rear end of the fourth bend, and the outer wall of the steam pipe is provided with a first anti-aging layer, a first transition layer, a thermal insulation layer, a second transition layer and a second anti-aging layer from the inside to the outside.

[0005] Preferably, the first anti-aging layer is made of glass fiber yarn impregnated with polyurethane wound on the outer surface of the steam pipe, and the second anti-aging layer is made of glass fiber yarn impregnated with polyurethane wound on the outer surface of the second transition layer.

[0006] Preferably, the thermal insulation layer is a polyurethane thermal insulation layer.

[0007] Preferably, the first anti-aging layer, the thermal insulation layer and the first transition layer are all provided with a first concave structure on one side thereof where they are in contact with each other, and the first transition layer material is filled in the first concave structure.

[0008] Preferably, the second anti-aging layer, the surface where the thermal insulation layer and the second transition layer are connected are all provided with a second concave structure, and the second transition layer material is filled in the second concave structure.

[0009] (2) Beneficial effects

[0010] The utility model provides a structure for preventing water hammer at a π bend of a steam pipe network running in a bidirectional manner. Compared with the prior art, the utility model has the following beneficial effects:

[0011] 1. Add steam traps at the π bends of the steam pipeline. There are 4 steam traps, which are respectively arranged at the front end of the first bend, the rear end of the second bend, the front end of the third bend and the rear end of the fourth bend of the steam pipeline. With this arrangement, the steam pipeline running in the opposite direction can also discharge steam condensate in time during the steam heating process, avoiding the accumulation of steam condensate and preventing water hammer.

[0012] 2. The setting of the first anti-aging layer and the second anti-aging layer greatly increases the strength of the steam pipe. The first anti-aging layer is made of glass fiber yarn impregnated with polyurethane wound on the outer surface of the steam pipe, and the second anti-aging layer is made of glass fiber yarn impregnated with polyurethane wound on the outer surface of the second transition layer, which improves the pressure resistance and tear resistance of the steam pipe.

[0013] 3. The setting of the insulation layer improves the thermal insulation performance of the steam pipe and reduces heat loss. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a structural schematic diagram of the prior art.

[0015] Figure 2 It is a structural schematic diagram of the utility model.

[0016] Figure 3 It is a cross-sectional view of the steam pipeline of the utility model.

[0017] The accompanying drawings are marked as: 1-steam pipe, 11-first bend, 12-second bend, 13-third bend, 14-fourth bend, 2-steam trap, 3-first anti-aging layer, 4-first transition layer, 41-first concave structure, 5-insulation layer, 6-second transition layer, 61-second concave structure, 7-second anti-aging layer. DETAILED DESCRIPTION

[0018] The utility model is further described in conjunction with the accompanying drawings and embodiments.

[0019] like Figures 1 to 3 As shown, the utility model describes a structure for preventing water hammer at a π bend in a bidirectional steam pipe network, comprising a steam pipe 1 and a steam trap 2, characterized in that the steam pipe 1 is π-shaped and is provided with a first bend 11, a second bend 12, a third bend 13, and a fourth bend 14 in sequence from one end to the other end, the number of the steam traps 2 is 4 and they are respectively arranged at the front end of the first bend 11, the rear end of the second bend 12, the front end of the third bend 13, and the rear end of the fourth bend 14 of the steam pipe 1, and a first anti-aging layer 3, a first transition layer 4, a thermal insulation layer 5, a second transition layer 6, and a second anti-aging layer 7 are provided on the outer wall of the steam pipe 1 from the inside to the outside.

[0020] The first anti-aging layer 3 is made of glass fiber yarn impregnated with polyurethane and wound on the outer surface of the steam pipe 1, and the second anti-aging layer 7 is made of glass fiber yarn impregnated with polyurethane and wound on the outer surface of the second transition layer 6, which improves the compression and tearing resistance of the steam pipe 1. The thermal insulation layer 5 is a polyurethane thermal insulation layer.

[0021] The first anti-aging layer 3, the thermal insulation layer 5 and the first transition layer 4 are connected to each other on one side thereof, and the first concave structure 41 is filled with the material of the first transition layer 4; by arranging an uneven first transition layer 4 between the first anti-aging layer 3 and the thermal insulation layer 5, the adhesion strength between the first anti-aging layer 3 and the thermal insulation layer 5 is enhanced.

[0022] The second anti-aging layer 7, the thermal insulation layer 5 and the second transition layer 6 are connected on one side thereof and a second concave structure 61 is provided, and the material of the second transition layer 6 is filled in the second concave structure 61; by arranging an uneven second transition layer 6 between the second anti-aging layer 7 and the thermal insulation layer 5, the adhesion strength between the second anti-aging layer 7 and the thermal insulation layer 5 is enhanced.

[0023] In actual work, a steam trap 2 is added at the π bend of the steam pipeline. The number of the steam traps 2 is 4 and they are respectively arranged at the front end of the first bend 11, the rear end of the second bend 12, the front end of the third bend 13 and the rear end of the fourth bend 14 of the steam pipeline 1. In this way, the steam pipeline running in the opposite direction can also discharge steam condensate in time during the steam heating process to avoid the accumulation of steam condensate and prevent water hammer. In addition, the first anti-aging layer 3, the first transition layer 4, the thermal insulation layer 5, the second transition layer 6 and the second anti-aging layer 7 are arranged on the outer wall of the steam pipeline 1 from the inside to the outside. The arrangement of the first anti-aging layer 3 and the second anti-aging layer 7 greatly increases the strength of the steam pipeline 1, and the arrangement of the thermal insulation layer 5 improves the thermal insulation performance of the steam pipeline 1 and reduces the loss of heat.

[0024] The above-mentioned embodiments only express the preferred implementation of the utility model, and the description is relatively specific and detailed, but the utility model is not limited to these embodiments. It should be pointed out that for ordinary technicians in this field. Under the premise of not departing from the purpose of the utility model, any improvement made shall fall within the protection scope of the utility model. Therefore, the protection scope of the utility model patent shall be based on the attached claims.

Claims

1. A structure for preventing water hammer at a π bend in a bidirectional steam pipe network, comprising a steam pipe (1) and a steam trap (2), characterized in that: The steam pipe (1) is π-shaped and is provided with a first bend (11), a second bend (12), a third bend (13), and a fourth bend (14) in sequence from one end to the other end. The number of the steam traps (2) is four and they are respectively arranged at the front end of the first bend (11), the rear end of the second bend (12), the front end of the third bend (13), and the rear end of the fourth bend (14) of the steam pipe (1). The outer wall of the steam pipe (1) is provided with a first anti-aging layer (3), a first transition layer (4), a thermal insulation layer (5), a second transition layer (6), and a second anti-aging layer (7) in sequence from the inside to the outside.

2. A structure for preventing water hammer at a π bend in a bidirectional steam pipe network according to claim 1, characterized in that: The first anti-aging layer (3) is made of glass fiber yarn impregnated with polyurethane and wound on the outer surface of the steam pipe (1), and the second anti-aging layer (7) is made of glass fiber yarn impregnated with polyurethane and wound on the outer surface of the second transition layer (6).

3. The structure for preventing water hammer at the π bend of a bidirectional steam pipe network according to claim 1 is characterized in that: The thermal insulation layer (5) is a polyurethane thermal insulation layer.

4. The structure for preventing water hammer at the π bend of a bidirectional steam pipe network according to claim 1 is characterized in that: A first concave structure (41) is provided on the surface where the first anti-aging layer (3) and the thermal insulation layer (5) are connected to the first transition layer (4), and the material of the first transition layer (4) is filled in the first concave structure (41).

5. The structure for preventing water hammer at the π bend of a bidirectional steam pipe network according to claim 1 is characterized in that: A second concave structure (61) is provided on the surface where the second anti-aging layer (7) and the thermal insulation layer (5) are connected to the second transition layer (6), and the second concave structure (61) is filled with the material of the second transition layer (6).

Images