A design method for long-distance low-pressure steam pipelines

Abstract

This invention discloses a design method for long-distance low-pressure steam pipelines, belonging to the technical field of steam pipeline design. Within every 100 meters of steam transmission distance, a set of compensators is installed on the pipeline. These compensators include a rotary compensator and a transverse compensator. The transverse compensator is designed in a hook-like manner, with a sloped bottom. A steam trap is installed at the lowest point of the transverse compensator. The two compensators designed in this invention work together to simultaneously eliminate rotational and transverse stresses in the pipeline. This method is low-cost, widely applicable, and effective.

Description

Technical Field

[0001] The present invention belongs to the technical field of steam pipeline design, and in particular relates to a design method for a long-distance low-pressure steam pipeline. Background Art

[0002] The low-pressure steam commonly used in the metallurgical industry has a pressure of 0.2 to 0.5 MPa and is transported through low-pressure steam pipelines. Some steam pipelines are long, and require design for temperature and pressure changes in the pipelines. The steam compensators commonly used in the industry are mainly bellows compensators. This equipment can meet the lateral compensation caused by temperature changes in steam pipelines. However, bellows compensators have a certain fatigue life. When the material is not properly selected, it is easy to cause equipment damage, resulting in steam leakage. At the same time, the bellows compensator cannot eliminate the rotational stress of the pipeline and has certain defects. This invention patent is mainly designed for lateral compensation and rotational compensation of low-pressure steam pipelines to extend the service life of low-pressure steam pipelines. Summary of the Invention

[0003] The purpose of the present invention is to solve the damage to the steam pipeline caused by the pipeline rotation stress and lateral stress caused by the temperature difference change in the pipeline during the long-distance transportation of low-pressure steam, thereby reducing the failure rate of the steam pipeline network and reducing the occurrence of safety accidents.

[0004] To achieve the above object, the technical solution adopted by the present invention is as follows:

[0005] A design method for a long-distance low-pressure steam pipeline is disclosed. Within every 100 meters of steam transmission distance, a group of compensators is installed on the transmission pipeline. The compensators include a rotary compensator and a transverse compensator. The transverse compensator is designed in a hook manner. The bottom of the transverse compensator has a certain slope, and a steam trap is installed at the lowest point of the transverse compensator.

[0006] A further improvement of the technical solution of the present invention is that, along the steam flow direction, the steam first passes through the rotary compensator and then passes through the transverse compensator.

[0007] A further improvement of the technical solution of the present invention is that the rotary compensator and the transverse compensator are both made of the same type of pipe.

[0008] A further improvement of the technical solution of the present invention is that the rotary compensator is spiral, and its preparation method is that the pipeline spirals upward clockwise, and finally spirals 360°, and the low-pressure steam transmission pipeline extends to a distance after passing through the rotary compensator.

[0009] A further improvement of the technical solution of the present invention is that when the rotary compensator spirals upward, the overall structure adopts a straight pipe, and the corners are connected with curved pipes.

[0010] A further improvement of the technical solution of the present invention is that the shape of the lateral compensator is two hooks connected at the bottom, the upper parts of the hooks are higher than the conveying pipeline, and the two upper ports of the hooks are connected to the low-pressure steam conveying pipeline.

[0011] A further improvement of the technical solution of the present invention is that the bottom pipe of the lateral compensator is inclined at a certain angle to one end, and a steam trap is connected to the lowest point of the bottom of the lateral compensator.

[0012] A further improvement of the technical solution of the present invention is that the bottom pipe of the lateral compensator is inclined toward the middle at a certain angle, and a steam trap is connected to the lowest point of the bottom of the lateral compensator.

[0013] By adopting the above technical solution, the present invention achieves the following technical effects:

[0014] The compensators in this application's design method for long-distance low-pressure steam pipelines are all made of the same type of pipe, reducing the cost of custom-made steam compensators while also avoiding steam leaks caused by compensator selection issues or lifespan issues. The two compensators in this application work together to eliminate both rotational and lateral stresses in the pipeline. This application adds a lowest point within a certain interval, installing a steam trap at the lowest point of the lateral compensator to facilitate steam pipeline water delivery, allowing condensate to flow to that point before being discharged, reducing water shock in the pipeline. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic diagram of a design method for a long-distance low-pressure steam pipeline according to the present invention;

[0016] Among them: 1. Rotary compensator, 2. Transverse compensator, 3. Steam trap. DETAILED DESCRIPTION

[0017] In view of the shortcomings of the existing technology, the purpose of the present invention is to provide a design method for long-distance low-pressure steam pipelines with wider applicability. As the application of low-pressure steam in production units or civil heating gradually increases, the design and maintenance of steam pipelines will become the focus, and it is necessary to comprehensively consider the impact of steam pipeline temperature changes and pressure changes on pipeline stress.

[0018] The method of the present invention is further described below with reference to the accompanying drawings;

[0019] Please see the attached Figure 1A design method for long-distance low-pressure steam pipelines with wider applicability. A group of compensators is set on the pipeline within every 100 meters of steam transportation. The compensators include a rotary compensator 1 and a transverse compensator 2. The transverse compensator 2 is designed in a hook manner. The bottom of the transverse compensator 2 has a certain slope, and a steam trap 3 is set at the lowest point of the transverse compensator 2.

[0020] Following the steam flow direction, the steam first passes through the rotary compensator 1 and then through the transverse compensator 2.

[0021] The rotary compensator 1 is spiral, and its preparation method is that the pipeline spirals upward clockwise, and finally spirals 360 degrees. When the rotary compensator 1 spirals upward, the overall structure adopts a straight pipe, and the corners are connected with curved pipes.

[0022] The low-pressure steam transmission pipeline extends to a distant place after passing through the rotary compensator 1, and the steam reaches the transverse compensator 2 after passing through the rotary compensator 1.

[0023] The lateral compensator 2 is in the shape of two hooks connected at the bottom, the upper parts of the hooks are higher than the conveying pipeline, and the two upper ports of the hooks are connected to the low-pressure steam conveying pipeline.

[0024] The bottom pipe of the transverse compensator 2 is inclined at a certain angle to one end, and a steam trap 3 is connected to the lowest point of the bottom of the transverse compensator 2 .

[0025] Another way is: the bottom pipe of the transverse compensator 2 is tilted toward the middle at a certain angle, and a steam trap 3 is connected to the lowest point of the bottom of the transverse compensator 2.

[0026] The design of steam trap 3 facilitates water transportation in the steam pipeline, allowing the condensate in the pipeline to flow to this location and then be discharged, reducing water shock in the pipeline.

[0027] The rotary compensator 1 and the transverse compensator 2 are both made of the same type of pipe, which reduces the cost of custom-made steam compensators and also avoids steam leakage caused by compensator selection problems or life problems.

[0028] The specific embodiments described above are merely illustrative of preferred embodiments of the present invention and are not intended to limit the concept and scope of the present invention. Those skilled in the art will appreciate that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the present invention. Therefore, it is intended that the appended claims encompass all such changes and modifications within the scope of the present invention.

Claims

1. A design method for a long-distance low-pressure steam pipeline, characterized by: A group of compensators is provided on the transmission pipeline within every 100 meters of steam transmission distance, wherein the compensators include a rotary compensator (1) and a transverse compensator (2). The transverse compensator (2) is designed in a hook manner, and the bottom of the transverse compensator (2) has a certain slope. A steam trap (3) is provided at the lowest point of the transverse compensator (2). The rotary compensator (1) and the transverse compensator (2) are both made of the same type of pipe; the rotary compensator (1) is a spiral type, and its preparation method is that the pipe spirals upward clockwise, and finally spirals 360 degrees, and the low-pressure steam delivery pipe passes through the rotary compensator (1) and extends to a distant place; The transverse compensator (2) is in the shape of two hooks connected at the bottom, the upper parts of the hooks are higher than the conveying pipeline, and the two upper ports of the hooks are connected to the low-pressure steam conveying pipeline; the bottom pipeline of the transverse compensator (2) is inclined at a certain angle to one end or the middle, and a steam trap (3) is connected to the lowest point of the bottom of the transverse compensator (2).

2. The design method for a long-distance low-pressure steam pipeline according to claim 1 is characterized in that: Following the steam flow direction, the steam first passes through the rotary compensator (1) and then passes through the transverse compensator (2).

3. The design method for a long-distance low-pressure steam pipeline according to claim 1 is characterized in that: When the rotary compensator (1) spirals upward, the overall structure adopts a straight pipe, and the corners are connected with curved pipes.

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