Cooling absorption equipment

Abstract

The utility model belongs to the technical field of chemical raw material production, and discloses cooling absorption equipment, which comprises a reaction pipe, a receiving device and a liquid inlet pipe, the reaction pipe comprises a main pipeline and a flaring part, and the flaring part is connected below the main pipeline. The receiving device comprises a main body part and a closing-in part, the closing-in part is connected to the top of the main body part, the reaction tube penetrates through the closing-in part, the outer wall of the main pipeline is connected to the closing-in end of the closing-in part, the flaring part is located in the main body part, and an annular cleaning cavity is formed among the main pipeline, the flaring part, the main body part and the closing-in part; the flaring end of the flaring part and the inner wall of the main body part are spaced to form a flowing gap. The liquid inlet pipe is connected to the main body part and communicated with the cleaning cavity, and the liquid inlet pipe is tangent to the side wall of the main body part. The cooling absorption equipment can prevent viscous impurities from making contact with the inner wall of the main body part, accumulation of the impurities is prevented, regular shutdown for cleaning is not needed, the production efficiency is improved, and the working intensity is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of chemical raw material production, in particular to a cooling absorption device. Background Art

[0002] In vapor-phase phosgenation technology for producing isocyanates, a vertical tubular reactor is commonly used. Gaseous amines and phosgene mix evenly at the top, reacting within seconds. The resulting gaseous isocyanate product is then absorbed by the solvent through cooling and captured in a reaction liquid receiving vessel below the reactor. This highly viscous substance easily adheres to the walls and is difficult to rinse. This is especially true during the cooling and absorption stage, where the high-temperature gaseous product comes into contact with the solvent or product mixture used for cooling and absorption, and adheres to the inner walls of the cooling section as the solvent sprays away.

[0003] After long-term operation, polymers and coking materials stick to the wall very seriously. Even if the reaction liquid spray flow rate is increased to a high level, they still cannot be flushed clean. The equipment needs to be dismantled regularly to remove impurities, and a brush needs to be inserted from the top of the reaction tube to scrub. This process is complicated and dangerous, affecting the efficiency of cooling and absorption.

[0004] Therefore, there is an urgent need for a cooling absorption device to solve the above problems. Utility Model Content

[0005] The purpose of the utility model is to provide a cooling absorption device that can prevent high-viscosity impurities from directly contacting the inner wall. The impurities can flow into the reaction liquid kettle along with the solvent without disassembling the equipment for cleaning.

[0006] To achieve this purpose, the present invention adopts the following technical solutions:

[0007] A cooling absorption device is provided, comprising:

[0008] A reaction tube, the reaction tube comprising a main pipe and a flared portion, the flared portion being connected below the main pipe;

[0009] A receiving device, the receiving device comprising a main body and a closing portion, the closing portion being connected to the top of the main body, the reaction tube being passed through the closing portion, the outer wall of the main line being connected to the closing end of the closing portion, the flaring portion being located within the main body, an annular cleaning chamber being formed between the main line, the flaring portion, the main body, and the closing portion, and a flow gap being formed between the flaring end of the flaring portion and the inner wall of the main body;

[0010] A liquid inlet pipe is connected to the main body and communicated with the cleaning chamber, and the liquid inlet pipe is tangent to the side wall of the main body.

[0011] As an optional solution for cooling the absorption device, a through hole is provided on the side wall of the main body, and the through hole is located below the flow gap.

[0012] As an optional solution for the cooling absorption device, a plurality of through holes are provided, and the plurality of through holes are evenly distributed on the main body.

[0013] As an optional solution for the cooling absorption device, the cooling absorption device further includes a spraying device, the spraying device is provided through the through hole, and the nozzle of the spraying device is located inside the main body.

[0014] As an optional solution for the cooling absorption equipment, the receiving device further includes a flange structure, which is connected to the side wall of the main body and is correspondingly arranged at the through hole, and the spraying device is detachably connected to the flange structure.

[0015] As an optional solution for cooling the absorption device, in the radial direction of the main body, the distance between the nozzle and the inner wall of the main body is 3 mm-6 mm.

[0016] As an optional solution for cooling the absorption device, in the axial direction of the main body, the distance between the flow gap and the through hole is greater than or equal to 300 mm.

[0017] As an optional solution for cooling the absorption equipment, the nozzle of the spraying device is a hollow cone nozzle; or, the nozzle of the spraying device is a solid cone nozzle; or, the nozzle of the spraying device is a spiral nozzle.

[0018] As an optional solution for cooling the absorption device, in the axial direction of the main body, the height of the cleaning chamber is 150 mm-250 mm.

[0019] As an optional solution for cooling the absorption device, the width of the flow gap is 3 mm to 6 mm.

[0020] Beneficial effects of the utility model:

[0021] The utility model provides a cooling absorption device, wherein the lower end of the reaction tube extends into the receiving device, the side wall of the main line is connected to the closing part of the receiving device, and a flow gap is formed between the flared part of the reaction tube and the inner wall of the receiving device, so that the cleaning liquid in the cleaning chamber can flow out of the cleaning chamber. The liquid inlet pipe is tangent to the side wall of the main body and is connected to the cleaning chamber. When the cleaning liquid enters the cleaning chamber from the liquid inlet pipe, the cleaning liquid has a certain viscosity and can flow on the side wall of the cleaning chamber. When the flow rate of the cleaning liquid reaches a predetermined flow rate, the cleaning liquid can cover the side wall of the cleaning chamber in the circumferential direction, and the cleaning liquid flows downward under the action of gravity, and covers the inner wall of the main body through the flow gap to form a cleaning liquid layer. The cleaning liquid layer can isolate viscous impurities from the inner wall of the main body, avoid the viscous impurities from contacting the inner wall of the main body, thereby preventing the accumulation of impurities. There is no need to stop the machine regularly for cleaning, thereby improving production efficiency and reducing work intensity. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a structural diagram of the cooling absorption equipment provided by the utility model;

[0023] Figure 2 yes Figure 1 Cross-sectional view at point A;

[0024] Figure 3 It is a cross-sectional view of the main body of the cooling absorption equipment provided by the present invention.

[0025] In the picture:

[0026] 1. Reaction tube; 11. Main pipe; 12. Flaring part;

[0027] 2. Receiving device; 21. Main body; 211. Through hole; 22. Closing portion; 23. Cleaning chamber; 24. Flow gap; 25. Flange structure; 26. Receiving chamber;

[0028] 3. Liquid inlet pipe;

[0029] 4. Spray device. DETAILED DESCRIPTION

[0030] The present invention will be further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are intended only to illustrate the present invention and are not intended to limit the present invention. It should also be noted that, for ease of description, the accompanying drawings only illustrate portions relevant to the present invention, not all of its components.

[0031] In the description of this utility model, unless otherwise specified or limited, the terms "connected," "connect," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0032] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Moreover, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0033] In the description of this embodiment, the terms "upper," "lower," "right," and other orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely for ease of description and simplified operation. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention. Furthermore, the terms "first" and "second" are used solely for descriptive purposes and have no special meaning.

[0034] like Figures 1 to 3 As shown, the cooling absorption equipment of this embodiment includes a reaction tube 1, a receiving device 2 and a liquid inlet pipe 3. The reaction tube 1 includes a main line 11 and a flared portion 12. The flared portion 12 is connected to the bottom of the main line 11. The radial dimension of the flared portion 12 is larger than the radial dimension of the main line 11. The receiving device 2 includes a main body 21 and a closed portion 22. The closed portion 22 is connected to the top of the main body 21. The reaction tube 1 is inserted into the closed portion 22. The radial dimension of the closed end of the closed portion 22 is smaller than the radial dimension of the main body 21. The outer wall of the main line 11 is connected to the closed end of the closed portion 22. The flared portion 12 is located within the main body 21. An annular cleaning chamber 23 is formed between the outer wall of the main line 11, the outer wall of the flared portion 12, the inner wall of the main body 21, and the inner wall of the closed portion 22. Below the flared portion 12, a receiving chamber 26 is formed within the main body 21 for receiving residual reaction substances. The flared end of the flared portion 12 is separated from the inner wall of the main body 21 to form a flow gap 24. The liquid inlet pipe 3 is connected to the main body 21 and communicates with the cleaning chamber 23. The liquid inlet pipe 3 is tangent to the side wall of the main body 21.

[0035] The utility model provides a cooling absorption device, wherein the lower end of the reaction tube 1 extends into the receiving device 2, the side wall of the main line 11 is connected to the closing portion 22 of the receiving device 2, and a flow gap 24 is formed between the flared portion 12 of the reaction tube 1 and the inner wall of the receiving device 2, so that the cleaning liquid in the cleaning chamber 23 can flow out of the cleaning chamber 23. The liquid inlet pipe 3 is tangent to the side wall of the main body 21 and is connected to the cleaning chamber 23. When the cleaning liquid enters the cleaning chamber 23 from the liquid inlet pipe 3, the cleaning liquid has a certain viscosity and can adhere to the side wall of the cleaning chamber 23 and flow. When the flow rate of the cleaning liquid reaches a predetermined flow rate, the cleaning liquid can cover the side wall of the cleaning chamber 23 in the circumferential direction, and the cleaning liquid flows downward along the side wall of the cleaning chamber 23 under the action of gravity, and covers the inner wall of the main body 21 with the cleaning liquid through the flow gap 24 to form a cleaning liquid layer. The cleaning liquid layer can isolate sticky impurities from the inner wall of the main body 21, preventing the sticky impurities from contacting the inner wall of the main body 21. The impurities can flow into the receiving chamber 26 with the cleaning liquid, thereby preventing the accumulation of impurities. There is no need to stop the machine regularly for cleaning, which improves production efficiency and reduces work intensity.

[0036] Preferably, the height of the cleaning chamber 23 in the axial direction of the main body 21 is 150 mm to 250 mm. This ensures that the cleaning chamber 23 has sufficient flow height, allowing the cleaning liquid to circumferentially distribute along the sidewalls of the cleaning chamber 23, ensuring the circumferential integrity of the cleaning liquid layer, and preventing portions of the inner wall of the main body 21 from being uncovered by the cleaning liquid, which could result in sticky impurities adhering to and remaining on the inner wall of the main body 21. For example, the height of the cleaning chamber 23 can be set to 150 mm, 180 mm, 200 mm, 250 mm, etc.

[0037] Optionally, the flared portion 12 may be configured as a conical flared portion, which is beneficial for ensuring the flow efficiency of the cleaning liquid toward the side wall of the main body 21 and preventing the cleaning liquid from staying on the flared portion 12 .

[0038] Preferably, the width of the flow gap 24 is 3mm-6mm. When the width of the flow gap 24 is less than 3mm, the flow gap 24 is too small, and the cleaning liquid easily fills the flow gap 24, causing blockage of the cleaning liquid, affecting the formation of the cleaning liquid layer on the side wall of the receiving cavity 26, and failing to achieve the effect of this embodiment. When the width of the flow gap is greater than 6mm, some of the cleaning liquid drips from the side of the flow gap 24 near the flared portion 12 and cannot adhere to the inner wall of the main body 21, resulting in waste of cleaning liquid. Exemplarily, the width of the flow gap 24 can be set to 3mm, 4mm, 5mm, 6mm, etc.

[0039] Furthermore, a through hole 211 is provided on the side wall of the main body 21, and the through hole 211 is located below the flow gap 24, that is, the through hole 211 is provided on the side wall of the receiving chamber 26. The cooling absorption device also includes a spray device 4, which is provided through the through hole 211, and the nozzle of the spray device 4 is located inside the main body 21. The spray device can spray a cooling substance into the receiving chamber 26 to achieve cooling and absorption of the reactants. Optionally, the nozzle of the spray device 4 can use a hollow cone nozzle, a spiral nozzle or a solid cone nozzle, etc., so as to adapt to the use of different cooling substances. For example, a cooling substance in the form of a low-viscosity liquid is used to cool the reaction gas, and a hollow cone nozzle is preferably used; a cooling substance in the form of a high-viscosity liquid is used to cool the reaction gas, and a spiral nozzle is preferably used; a cooling substance in the form of a gas is used to cool the reaction gas, and a solid cone nozzle is preferably used, thereby expanding the scope of use and improving the scope of application of the cooling absorption device.

[0040] Preferably, in the axial direction of the main body 21, the distance between the flow gap 24 and the through hole 211 is greater than or equal to 300 mm to prevent the spray device 4 from being too close to the reaction tube 1 and affecting the reaction of substances in the reaction tube 1. For example, the distance between the flow gap 24 and the through hole 211 can be set to 300 mm, 320 mm, 350 mm, 400 mm, etc.

[0041] Preferably, in the radial direction of the main body 21, the distance between the nozzle and the inner wall of the main body 21 is 3 mm to 6 mm. When the distance between the nozzle and the inner wall of the main body 21 is less than 3 mm, the cleaning liquid layer and the nozzle interact with each other, and the nozzle is close to the inner wall of the receiving chamber 26. The cooling substance sprayed by the nozzle will affect the formation of the cleaning liquid layer, and the cleaning liquid will hinder the spraying of the nozzle. When the distance between the nozzle and the inner wall of the receiving chamber 26 is greater than 6 mm, it is not conducive to sufficient cooling in the receiving chamber 26. Exemplarily, the distance between the nozzle and the inner wall of the receiving chamber 26 can be set to 3 mm, 4 mm, 5 mm, 6 mm, etc.

[0042] To ensure a good spraying effect, in this embodiment, multiple through holes 211 are provided, and the multiple through holes 211 are evenly distributed on the main body 21. Multiple spray devices 4 are also provided, and the multiple spray devices 4 correspond one-to-one with the multiple through holes 211 to ensure sufficient cooling in the receiving cavity 26. Exemplarily, the multiple through holes 211 are arranged in four rows along the axial direction. The four rows of through holes 211 are evenly distributed in the circumferential direction of the main body 21, each row includes three through holes 211, and the through holes 211 in each row are staggered in the axial direction to ensure uniform spraying.

[0043] Furthermore, in order to facilitate the inspection and replacement of the spray device 4, the receiving device 2 also includes a flange structure 25, which is connected to the side wall of the main body 21 and is correspondingly arranged in the through hole 211. The spray device 4 can be detachably connected to the flange structure 25 to avoid the spray device 4 being connected to the main body 21 by welding, thereby facilitating the disassembly of the spray device 4.

[0044] Obviously, the above embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention, and are not intended to limit the implementation methods of the present invention. Those skilled in the art will appreciate that other variations or modifications can be made based on the above description. It is not necessary and impossible to enumerate all implementation methods here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the claims of the present invention.

Claims

1. A cooling absorption device, characterized in that: include: A reaction tube (1), the reaction tube (1) comprising a main pipe (11) and a flared portion (12), the flared portion (12) being connected below the main pipe (11); A receiving device (2), the receiving device (2) comprising a main body (21) and a closing portion (22), the closing portion (22) being connected to the top of the main body (21), the reaction tube (1) being passed through the closing portion (22), the outer wall of the main pipe (11) being connected to the closing end of the closing portion (22), the flaring portion (12) being located inside the main body (21), an annular cleaning chamber (23) being formed between the main pipe (11), the flaring portion (12), the main body (21) and the closing portion (22), and a flow gap (24) being formed between the flaring end of the flaring portion (12) and the inner wall of the main body (21); A liquid inlet pipe (3), the liquid inlet pipe (3) is connected to the main body (21) and communicates with the cleaning chamber (23), and the liquid inlet pipe (3) is tangent to the side wall of the main body (21).

2. The cooling absorption equipment according to claim 1, characterized in that A through hole (211) is provided on the side wall of the main body (21), and the through hole (211) is located below the flow gap (24).

3. The cooling absorption device according to claim 2, characterized in that: A plurality of through holes (211) are provided, and the plurality of through holes (211) are evenly distributed on the main body (21).

4. The cooling absorption device according to claim 2, characterized in that: The cooling absorption equipment further comprises a spray device (4), wherein the spray device (4) is provided through the through hole (211), and a nozzle of the spray device (4) is located inside the main body (21).

5. The cooling absorption equipment according to claim 4, characterized in that: The receiving device (2) further comprises a flange structure (25), the flange structure (25) being connected to the side wall of the main body (21) and correspondingly arranged at the through hole (211), and the spraying device (4) being detachably connected to the flange structure (25).

6. The cooling absorption equipment according to claim 4, characterized in that In the radial direction of the main body (21), the distance between the nozzle and the inner wall of the main body (21) is 3 mm to 6 mm.

7. The cooling absorption equipment according to claim 4, characterized in that In the axial direction of the main body (21), the distance between the flow gap (24) and the through hole (211) is greater than or equal to 300 mm.

8. The cooling absorption device according to claim 4, characterized in that: The nozzle of the spraying device (4) is a hollow cone nozzle; Alternatively, the nozzle of the spraying device (4) is a solid cone nozzle; Alternatively, the nozzle of the spraying device (4) is a spiral nozzle.

9. The cooling absorption equipment according to claim 1, characterized in that In the axial direction of the main body (21), the height of the cleaning chamber (23) is 150 mm to 250 mm.

10. The cooling absorption equipment according to claim 1, characterized in that The width of the flow gap (24) is 3 mm to 6 mm.

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