Water-cooled air extraction pipeline with inner wall spiral flow structure

Abstract

The utility model belongs to the technical field of steel vacuum refining, especially relates to a water cooling air extraction pipeline with inner wall cyclone structure. A water cooling air extraction pipeline with inner wall cyclone structure, including air extraction pipeline body, the water cooling pipeline is equipped with in air extraction pipeline body outside tube wall, the water cooling pipeline includes water inlet and water outlet, and the pipeline between water inlet and water outlet is set up in parallel along air extraction pipeline body outside tube wall equidistance, a plurality of cyclone plates are evenly provided along the radial direction in air extraction pipeline body inside tube wall, and the cyclone plate is spirally distributed along air extraction pipeline body axial direction. The utility model discloses a water cooling pipeline is set up in air extraction pipeline body outside, and the cyclone plate is set up in air extraction pipeline body inside tube wall, can shorten the length required to the pipeline, and reduce production cost while improving gas cooling efficiency.

Description

Technical Field

[0001] This utility model belongs to the field of steel vacuum refining technology, and specifically relates to a water-cooled air extraction pipe with an inner wall swirl structure. Background Technology

[0002] In vacuum refining processes (such as RH, VD, VOD), a vacuum pump is used to create a vacuum in the system, causing the molten steel to circulate under negative pressure. Gases in the molten steel rise with it and escape, then are drawn away and discharged by the vacuum system, thus achieving the degassing of the molten steel through circulation.

[0003] During the smelting process, to protect the vacuum pump system and ensure its stable operation, the extracted smelting waste gas needs to be cooled and dusted. Therefore, a cooling device and a bag filter are installed before the vacuum pump. The better the cooling effect of the cooling device, the less damage to the filter bags and the less impact on the vacuum system, resulting in a lower frequency of filter bag replacement and thus helping to reduce production costs. Currently, to enhance the gas cooling effect, existing technology designs the extraction pipeline to be longer, increasing production costs. Utility Model Content

[0004] To overcome the problems of long length and high production cost of existing air extraction pipes, the purpose of this utility model is to provide a water-cooled air extraction pipe with an inner wall swirl structure. By setting a water-cooled pipe on the outside of the air extraction pipe body and setting a swirl plate on the inner wall of the air extraction pipe body, the gas cooling efficiency can be improved while shortening the required pipe length and reducing production costs.

[0005] The technical solution of this utility model is as follows: a water-cooled air extraction pipe with an inner wall swirl structure, including an air extraction pipe body, a water-cooled pipe provided on the outer wall of the air extraction pipe body, the water-cooled pipe including an inlet and an outlet, the pipe between the inlet and the outlet being arranged parallel to each other at equal intervals along the outer wall of the air extraction pipe body, and a plurality of swirl plates uniformly arranged radially on the inner wall of the air extraction pipe body, the swirl plates being spirally distributed along the axial direction of the air extraction pipe body.

[0006] The water-cooled pipe and the swirl plate are both welded to the main body of the air extraction pipe.

[0007] The number of swirl plates is 2 to 6, and the height of the swirl plates is 0.05 to 0.3 times the inner diameter of the exhaust pipe body.

[0008] The angle between the swirl plate and the centerline of the exhaust pipe body is in the range of 135°~180°.

[0009] The ratio of the pitch of the swirl plate to the inner diameter of the extraction pipe body is 2 to 6.

[0010] The technical advantages of this utility model are as follows: 1. This utility model features a water-cooled pipe installed on the outside of the extraction pipe body and a swirl plate installed on the inner wall of the extraction pipe body. This improves gas cooling efficiency while shortening the required pipe length and reducing production costs. 2. The swirl plates in this utility model are spirally distributed. The gas being extracted enters from the pipe inlet and flows forward in a spiral shape under the action of the swirl plates, significantly extending the gas flow path and the contact time with the inner wall of the pipe, thus improving gas cooling efficiency. 3. The water-cooled pipes in this utility model are arranged parallel to each other at equal intervals along the outer wall of the extraction pipe body, which enhances the cooling effect on the extraction pipe and effectively reduces the temperature of the gas at the pipe outlet.

[0011] The following will provide further explanation in conjunction with the accompanying drawings. Attached Figure Description

[0012] Figure 1 This is a three-dimensional structural diagram of a water-cooled air extraction pipe with an inner wall swirl structure according to the present invention.

[0013] Figure 2 This is a schematic diagram of the cross-sectional structure of a water-cooled air extraction pipe with an inner wall swirl structure according to the present invention.

[0014] Figure 3 This is a comparison diagram of the simulated streamline effect of this utility model and existing air extraction pipes.

[0015] Attached reference numerals: 1-Air extraction pipe body; 2-Water cooling pipe; 3-Swirl plate; 21-Water inlet; 22-Water outlet. Detailed Implementation Example 1

[0016] like Figure 1 , Figure 2 As shown, a water-cooled air extraction pipe with an inner wall swirl structure includes an air extraction pipe body 1. A water-cooled pipe 2 is provided on the outer wall of the air extraction pipe body 1. The water-cooled pipe 2 includes an inlet 21 and an outlet 22. The pipes between the inlet 21 and the outlet 22 are arranged parallel to each other at equal intervals along the outer wall of the air extraction pipe body 1. A plurality of swirl plates 3 are uniformly arranged radially on the inner wall of the air extraction pipe body 1. The swirl plates 3 are spirally distributed along the axial direction of the air extraction pipe body 1.

[0017] This invention features a water-cooled pipe installed on the outside of the main body of the extraction pipe, and a swirl plate installed on the inner wall of the main body. In actual use, the gas to be extracted enters through the inlet of the main body 1 and flows in a spiral shape under the action of the swirl plate, significantly extending the gas flow path and the contact time with the inner wall of the pipe. Combined with the cooling effect of the water-cooled pipe, this effectively reduces the temperature of the gas at the pipe outlet, thereby reducing the adverse effects of high-temperature gas on the subsequent bag filter and vacuum system. This invention has a simple structure and is easy to manufacture. While improving gas cooling efficiency, it can shorten the required pipe length and reduce production costs. Example 2

[0018] Based on Example 1, in this embodiment, preferably, the water-cooled pipe 2 and the swirl plate 3 are both welded to the exhaust pipe body 1.

[0019] The water-cooled pipe 2 and the swirl plate 3 described in this utility model are both welded to the air extraction pipe body 1, which makes the connection firm and easy to process. Example 3

[0020] Based on Embodiment 1 or Embodiment 2, in this embodiment, preferably, the number of swirl plates 3 is 2 to 6, and the ratio of the height of the swirl plate 3 to the inner diameter of the exhaust pipe body 1 is 0.05 to 0.3. The angle between the swirl plate 3 and the centerline of the exhaust pipe body 1 ranges from 135° to 180°. The ratio of the pitch of the swirl plate 3 to the inner diameter of the exhaust pipe body 1 is 2 to 6.

[0021] The present invention comprises 2 to 6 swirl plates 3, the height of which is 0.05 to 0.3 of the inner diameter of the exhaust pipe body 1. The angle between the swirl plate 3 and the centerline of the exhaust pipe body 1 ranges from 135° to 180°. The pitch of the swirl plate 3 is 2 to 6 of the inner diameter of the exhaust pipe body 1. (Comparison with simulated streamlines) Figure 3 As can be seen, under the same initial conditions, the gas in the existing extraction pipe is in a laminar flow state, and the gas velocity remains basically unchanged. However, with the addition of a swirl plate in this invention, the gas in the center of the pipe moves in a basically straight line, while the gas near the swirl plate moves in a spiral motion under its influence. This significantly extends the gas flow distance and the contact time between the gas and the inner wall of the pipe, resulting in better contact between the gas and the water-cooled pipe and effectively reducing the gas temperature. Simulation results show that, due to the effect of the swirl plate, the spirally moving gas also propels the gas near the center of the extraction pipe, increasing the average velocity of the outlet gas by about 12%.

[0022] In this invention, the gas spirals forward through the swirl plate, significantly extending the gas flow path and the contact time with the inner wall of the pipe. This ensures sufficient contact between the gas and the inner wall, and with the help of the water-cooled outer pipe, effectively reduces the outlet gas temperature, minimizing the impact of high-temperature gas on the subsequent bag filter and vacuum system. This invention also reduces the required length of the water-cooled extraction pipe, thereby lowering production costs.

[0023] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present utility model should be included within the protection scope of the present utility model.

Claims

1. A water-cooled air extraction pipe with an inner wall swirl structure, characterized in that: The system includes an air extraction pipe body (1), and a water-cooled pipe (2) is provided on the outer wall of the air extraction pipe body (1). The water-cooled pipe (2) includes an inlet (21) and an outlet (22). The pipes between the inlet (21) and the outlet (22) are arranged parallel to each other at equal intervals along the outer wall of the air extraction pipe body (1). A number of swirl plates (3) are uniformly provided radially on the inner wall of the air extraction pipe body (1). The swirl plates (3) are spirally distributed along the axial direction of the air extraction pipe body (1).

2. The water-cooled air extraction pipe with an inner wall swirl structure according to claim 1, characterized in that: The water-cooled pipe (2) and the swirl plate (3) are both welded to the exhaust pipe body (1).

3. The water-cooled air extraction pipe with an inner wall swirl structure according to claim 1, characterized in that: The number of swirl plates (3) is 2 to 6, and the height of the swirl plates (3) is 0.05 to 0.3 times the inner diameter of the exhaust pipe body (1).

4. The water-cooled air extraction pipe with an inner wall swirl structure according to claim 1, characterized in that: The angle between the swirl plate (3) and the center line of the exhaust pipe body (1) is 135°~180°.

5. The water-cooled air extraction pipe with an inner wall swirl structure according to claim 1, characterized in that: The pitch of the swirl plate (3) is 2 to 6 times the inner diameter of the exhaust pipe body (1).

Images