Anti-gathering manhole

Abstract

The utility model belongs to the technical field of manhole devices, and particularly relates to an anti-gathering manhole which comprises a pipe body 1, a baffle 2, four fixing nuts 3, four fixing bolts 4 and a sealing cover 5, the fixing nuts are fixedly connected with the inner wall of the pipe body, the baffle is provided with a plurality of open holes corresponding to the fixing nuts in position, and the sealing cover 5 is fixedly connected with the pipe body. The fixing bolt penetrates through the open hole to be detachably connected with the fixing nut, the sealing cover is detachably connected with a pipe opening in one side of the pipe body, and a compressed air adding opening is formed in the pipe wall of the pipe body. According to the anti-polymerization manhole, the retention area of materials in the manhole can be reduced, polymerization of acrylic acid is prevented, the amount of used compressed air is small, and a refining tower cannot be affected.

Description

Technical Field

[0001] The utility model belongs to the technical field of manhole devices, and in particular relates to an anti-agglomeration manhole. Background Art

[0002] Acrylic acid occupies a very important position in the field of fine chemicals and can be used to manufacture resins and synthetic rubber. Acrylic acid is mainly used in the production of acrylates in industry, accounting for about 96% of acrylic acid consumption, and is used in construction, papermaking, leather, textiles, plastic processing, packaging materials, daily chemicals, water treatment, oil production, metallurgy and other fields.

[0003] Since acrylic acid is easy to polymerize, during the purification and refining process of acrylic acid, when acrylic acid undergoes a phase change (from gas to liquid) in the manhole of the refining tower, the liquid acrylic acid loses the protection of the inhibitor and is prone to acrylic acid polymerization, causing polymerization first in the manhole and then spreading to the tower plates of the refining tower, affecting the operation cycle of the refining tower. At the same time, the polymerization in the manhole of the refining tower increases the workload for the maintenance of the refining tower. Utility Model Content

[0004] The purpose of the utility model is to solve the problem of easy polymerization in the manhole during the purification and refining of acrylic acid as described in the above background technology. A new anti-polymerization manhole is proposed, which can prevent acrylic acid from polymerizing in the manhole, thereby increasing the operating cycle of the refining tower and reducing the difficulty of maintenance.

[0005] A technical solution adopted to achieve the above-mentioned purpose is a kind of anti-agglomeration manhole, which includes a pipe body, a baffle, a plurality of fixing nuts, a plurality of fixing bolts and a cover. The plurality of fixing nuts are fixedly connected to the inner wall of the pipe body, the baffle is provided with a plurality of openings corresponding to the positions of the fixing nuts, the fixing bolts pass through the openings and are detachably connected to the fixing nuts, the cover is detachably connected to a pipe opening on one side of the pipe body, and a compressed air inlet is provided on the pipe wall of the pipe body.

[0006] In the above technical solution, by setting the baffle and introducing compressed air through the compressed air inlet, the compressed air enters the retention area through the baffle, and the pressure in the retention area is controlled to be a slightly positive pressure, thereby reducing the retention area of ​​acrylic acid in the manhole tube body. The above compressed air is equivalent to inhibitory air, which has an inhibitory effect on the polymerization of acrylic acid and will not affect the product quality.

[0007] Furthermore, the diameter of the baffle is smaller than the inner diameter of the tube body, and the center of the baffle is on the same horizontal line as the center of the tube body.

[0008] In the above technical solution, the baffle is located at the exact center of the tube body, and compressed air can enter the retention area of ​​acrylic acid through the gap between the baffle and the tube body to inhibit the polymerization of acrylic acid.

[0009] Furthermore, the gap between the baffle and the tube body is 2-5 mm.

[0010] In the above technical solution, the gap between the baffle and the tube body is controlled to be 2-5 mm. If the gap is too small, it is not conducive to the installation of the baffle. If the gap is too large, acrylic acid will enter the middle of the tube body through the gap for polymerization.

[0011] Furthermore, the gap between the baffle and the tube body is 2 mm.

[0012] In the above technical solution, the gap between the control baffle and the tube body is controlled to be 2 mm. The gap is moderate, and while it is convenient for installation, acrylic acid cannot enter the middle of the tube body. In addition, the 2 mm gap makes the amount of compressed air to be added very small, which will not affect the vacuum control of the refining tower. When the refining tower is stopped, it is only necessary to close the compressed air addition port.

[0013] Furthermore, the baffle is installed inside the side of the tube body away from the cover, and the baffle is 10-20 mm away from the tube opening on the side of the tube body away from the cover.

[0014] In the above technical solution, the baffle plate needs to be located close to the inlet end of acrylic acid. If the baffle plate is too far from the tube opening on the tube body side away from the cover, the blind area of ​​the blind plate close to the refining tower side is too large, and acrylic acid is prone to polymerization.

[0015] Furthermore, the baffle is installed inside the side of the tube body away from the cover, and the baffle is 10 mm away from the tube opening on the side of the tube body away from the cover.

[0016] Furthermore, a pressure gauge port is provided on the tube wall of the tube body.

[0017] In the above technical solution, the pressure gauge port is used to install an on-site pressure gauge to monitor the pressure in the pipe body.

[0018] Furthermore, the compressed air inlet and the pressure gauge port are located between the sealing cover and the baffle.

[0019] Furthermore, the plurality of fixing nuts are evenly spaced and fixedly connected to the inner wall of the tube body.

[0020] Furthermore, the baffle is made of stainless steel, and the thickness of the baffle is 3-5 mm.

[0021] Furthermore, the baffle has a thickness of 3 mm.

[0022] The advantages of the utility model are:

[0023] 1. The utility model has a simple structure and is easy to operate. It only needs to introduce compressed air before the refining tower is started to control the internal pressure of the pipe body to 1-5kPa, so as to reduce the polymerization rate of acrylic acid at the manhole.

[0024] 2. The amount of compressed air required to be introduced into the utility model is very small and will not affect the refining tower, and the introduction of compressed air will not affect the product quality.

[0025] 3. The utility model reduces the volume of the retention area of ​​acrylic acid in the pipe body by setting the baffle, thereby preventing acrylic acid from polymerizing in the manhole pipe body. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings in the following description are only embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0027] Figure 1 It is a structural schematic diagram of the utility model;

[0028] Figure 2 It is a front view of the utility model.

[0029] Illustration: 1. Tube body, 2. Baffle, 3. Fixing nut, 4. Fixing bolt, 5. Cover, 6. Opening, 7. Compressed air inlet, 8. Pressure gauge port. DETAILED DESCRIPTION

[0030] In order to enable those skilled in the art to better understand the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only embodiments of a part of the present invention rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work belong to the protection scope of the present invention.

[0031] In the description of the present invention, it should be understood that the terms "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0032] like Figure 1 As shown, an anti-agglomeration manhole is composed of a pipe body 1, a baffle 2, 4 fixing nuts 3, 4 fixing bolts 4 and a cover 5, wherein the 4 fixing nuts are evenly distributed up and down and left and right, and are fixedly connected to the inner wall of the pipe body. The fixed connection method can be selected as welding. The baffle is provided with 4 openings 6 corresponding to the positions of the fixing nuts. The 4 fixing bolts can pass through the openings and connect with the 4 fixing nuts respectively, so as to fix the baffle. The left pipe opening of the pipe body is detachably connected to the cover, and the right side of the pipe body is connected to the refining tower. The connection method can be flange connection. A compressed air inlet 7 and a pressure gauge port 8 are provided on the pipe wall of the pipe body between the cover and the baffle. The compressed air inlet is externally connected to a compressed air pipeline for inputting compressed air into the pipe body to control the air pressure in the pipe body. The pressure gauge port is used to install an on-site pressure gauge to monitor the air pressure changes in the pipe body.

[0033] The fixing nuts and fixing bolts play the role of fixing the baffle, and their number is not limited to 4. In other embodiments, 5, 6, 7, etc. can be selected.

[0034] like Figure 2 As shown, the diameter of the baffle is smaller than the inner diameter of the tube body, the center of the baffle and the center of the tube body are on the same horizontal line, and the gap between the baffle and the tube body is 2-5 mm, and in this embodiment, preferably 2 mm.

[0035] The baffle is 10-20 mm away from the right side opening of the tube body. In this embodiment, it is preferably 10 mm.

[0036] In this embodiment, the baffle is made of 304 stainless steel and has a thickness of 3 mm.

[0037] The working process and principle of the utility model are as follows: before the refining tower is started, compressed air is introduced through the compressed air adding port to control the pressure in the tube body to be 1-5kPa. The compressed air passes through the gap between the baffle and the inner wall of the tube body to control the pressure between the baffle and the flange area where the tube body and the refining tower are connected to be slightly positive pressure, thereby reducing the retention area volume of acrylic acid in the area and preventing acrylic acid polymerization.

[0038] Finally, it should be noted that this embodiment is only used to illustrate the present invention and does not limit the scope of the present invention. In addition, it should be understood that after reading the content of the present invention, those skilled in the art can make various changes or modifications to the present invention, and these equivalent forms also fall within the scope defined by the claims attached to this application.

Claims

1. An anti-agglomeration manhole, characterized in that: The anti-agglomeration manhole comprises a pipe body (1), a baffle (2), a plurality of fixing nuts (3), a plurality of fixing bolts (4) and a cover (5), wherein the plurality of fixing nuts are fixedly connected to the inner wall of the pipe body, the baffle is provided with a plurality of openings (6) corresponding to the positions of the fixing nuts, the fixing bolts pass through the openings and are detachably connected to the fixing nuts, the cover is detachably connected to a pipe opening on one side of the pipe body, and a compressed air inlet (7) is provided on the pipe wall of the pipe body.

2. The anti-agglomeration manhole according to claim 1, characterized in that: The diameter of the baffle is smaller than the inner diameter of the tube body, and the center of the baffle is on the same horizontal line as the center of the tube body.

3. The anti-agglomeration manhole according to claim 2, characterized in that: The gap between the baffle and the tube body is 2-5 mm.

4. The anti-agglomeration manhole according to claim 2, characterized in that: The gap between the baffle and the tube body is 2 mm.

5. The anti-agglomeration manhole according to claim 1, characterized in that: The baffle is installed inside the side of the tube body away from the cover, and the distance between the baffle and the tube opening on the side of the tube body away from the cover is 10-20 mm.

6. The anti-agglomeration manhole according to claim 1, characterized in that: The baffle is installed inside the side of the tube body away from the cover, and the baffle is 10 mm away from the tube opening on the side of the tube body away from the cover.

7. The anti-agglomeration manhole according to claim 1, characterized in that: A pressure gauge port (8) is also provided on the tube wall of the tube body.

8. The anti-agglomeration manhole according to claim 7, characterized in that: The compressed air inlet and the pressure gauge port are located between the sealing cover and the baffle.

9. The anti-agglomeration manhole according to claim 1, characterized in that: The plurality of fixing nuts are evenly distributed and fixedly connected to the inner wall of the pipe body.

10. The anti-agglomeration manhole according to claim 1, characterized in that: The baffle is made of stainless steel, and the thickness of the baffle is 3-5 mm.

Images