Coagulation kettle based on steam jet negative pressure regulation

Abstract

The utility model discloses a condensation kettle based on steam jet negative pressure regulation, which comprises a main kettle body, the upper part of the main kettle body is detachably connected with an end cover, the upper part of the end cover is welded with a flange plate, the upper part of the flange plate is detachably connected with a steam jet, the steam jet comprises a steam inlet pipe and a throat pipe part, and the throat pipe part is welded with a steam outlet pipe. The steam inlet pipe is connected with the upper portion of the throat pipe part through a connecting bent pipe, and an adjusting valve is arranged on the connecting bent pipe. The detachable end cover is installed on the upper portion of the main kettle body, the flange plate is welded to the end cover, then the steam ejector is connected, the steam inlet pipe is connected with the throat pipe portion through the connecting bent pipe, and the adjusting valve is arranged, so that dynamic negative pressure regulation is achieved, immediate adjustment can be achieved according to actual production requirements, production efficiency is remarkably improved, and production cost is reduced. And an operator can finely adjust the steam injection amount according to specific conditions of colloidal particle water treatment to achieve an optimal negative pressure state, so that the flash evaporation and vaporization processes of solvent oil are optimized.

Description

Technical Field

[0001] The utility model belongs to the technical field of condensation kettles, and in particular relates to a condensation kettle based on steam injection negative pressure regulation. Background Art

[0002] In the continuous development of chemical and polymer production processes, condensation technology, as one of the core links, plays a vital role in improving product quality and reducing production costs. In recent years, the three-kettle condensation technology widely used in China has achieved a balance between resource conservation and safe production to a certain extent, and improved process economy and safety by optimizing steam use and reducing solvent oil consumption. However, with the increasingly stringent global environmental protection standards, especially the strict environmental protection requirements of the European and American markets for imported products, the existing technology has exposed significant deficiencies in environmental protection performance. Although progress has been made in the safety of the process, the residual solvent content of the product is still difficult to meet the high standards of the export market, which has become a key bottleneck restricting industrial upgrading. Specifically, although the traditional three-kettle process effectively reduces steam consumption, there are limited measures to completely remove solvent oil, which makes it difficult for the solvent oil content in the finished glue to reach the entry threshold of the international high-end market, such as the strict limit below 20ppm, which limits the international market competitiveness of my country's chemical products.

[0003] The coagulation kettle of the prior art, such as China Utility Model Publication No. CN219232362U, discloses a coagulation kettle for producing EPDM rubber by solution method, which is structured into two parts, upper and lower, wherein: the lower part is a liquid phase area, in which a mixture of water and rubber particles is in the reaction process, and the upper part is a gas phase area, in which a gas phase mixture composed of water vapor and gas phase hexane is in the reaction process. The coagulation kettle structure is divided into two parts, upper and lower, and the diameter of the upper gas phase area is made larger than the diameter of the lower liquid phase area. The increase in the diameter of the upper gas phase area can effectively reduce the gas flow rate, which is conducive to the sedimentation of rubber foam, thereby reducing the amount of rubber powder entrainment; at the same time, the overall height of the coagulation kettle is increased (that is, the ratio of the height of the coagulation kettle to the diameter of the gas phase area is increased), so that the residence time of the medium is increased, the sedimentation time of the rubber powder is increased, thereby reducing the amount of rubber powder entrainment, and these two improvements can greatly reduce the risk of rubber foam entrainment in the gas discharged from the coagulation kettle.

[0004] However, there are some problems with the existing technology: it does not have an adjustable steam injector, and the flash evaporation and vaporization efficiency of solvent oil from the colloid water is low, which makes it difficult for the solvent oil content in the finished rubber to reach the entry threshold of the international high-end market, such as below 20ppm. Therefore, we propose a condensation kettle based on steam injection negative pressure regulation. Utility Model Content

[0005] In view of the problems existing in the prior art, the purpose of the utility model is to provide a condensation kettle based on steam injection negative pressure regulation. By providing a steam injector, a connecting elbow and a regulating valve, the steam injection technology is creatively integrated. Through the precisely designed steam injector assembly, the negative pressure conditions in the condensation kettle are accurately regulated, so that the negative pressure of the third kettle can be greatly reduced from the conventional -10kPa to -30 to -50kPa, which greatly improves the removal efficiency of solvent oil and directly reduces the solvent oil content in the colloid water to below 20ppm, perfectly meeting the strict environmental protection requirements of the European and American markets.

[0006] The utility model is implemented as follows: a condensation kettle based on steam injection negative pressure regulation comprises a main kettle body, the upper part of the main kettle body is detachably connected with an end cover, the upper part of the end cover is welded with a flange, the upper part of the flange is detachably connected with a steam injector, the steam injector comprises a steam inlet pipe and a throat portion, the steam inlet pipe and the upper part of the throat portion are connected by a connecting elbow, a regulating valve is provided on the connecting elbow, the outer side of the steam inlet pipe is sleeved with a receiving chamber, the upper part of the end cover is detachably connected with a motor, the lower end of the output shaft of the motor is connected with a main shaft through a coupling, a stirring blade is welded on the outer side of the main shaft, a gas phase zone is provided inside the main kettle body, a transition zone is provided at the lower part of the gas phase zone, a liquid phase zone is provided at the lower part of the transition zone, and a bottom end portion is provided at the lower part of the main kettle body.

[0007] Optionally, a steam nozzle is provided at the right end of the steam inlet pipe, and the steam inlet pipe is connected to the left end of the receiving chamber through a flange.

[0008] Optionally, the right side of the receiving chamber is connected to a tapered portion of the mixing chamber via a flange, and the right side of the tapered portion of the mixing chamber is fixedly connected to a tail portion of the mixing chamber.

[0009] Optionally, the right end of the rear portion of the mixing chamber is welded to the throat portion, and a diffuser portion is welded to the right side of the throat portion.

[0010] Optionally, flanges are welded to the right end of the diffuser and the left end of the steam inlet pipe, respectively.

[0011] Optionally, a low-pressure steam inlet is welded to the lower portion of the receiving chamber, and a flange is welded to the lower portion of the low-pressure steam inlet.

[0012] Optionally, the receiving chamber and the connecting elbow are respectively connected to a first diaphragm box pressure gauge, and the upper portion of the end cover is fixedly connected to a second diaphragm box pressure gauge.

[0013] Optionally, a discharge pipe is connected to the left side of the bottom end portion, and a plurality of sight glasses are provided on the left side of the main kettle body.

[0014] Compared with the prior art, the beneficial effects of the utility model are:

[0015] 1. Innovative integration of steam ejectors: By installing a removable end cover on the upper part of the main kettle body and welding a flange to connect the steam ejectors, this design not only facilitates equipment maintenance and overhaul, but also ensures the system's tightness and operational safety. The introduction of the steam ejectors, especially the structure in which the steam inlet pipe is connected to the throat through a connecting elbow and equipped with a regulating valve, makes it possible to accurately control the steam flow rate, providing a flexible and efficient means for subsequent negative pressure regulation. The beneficial effect of this step is that it realizes dynamic and precise negative pressure regulation. Compared with the traditional fixed pressure setting, it can be adjusted instantly according to actual production needs, significantly improving production efficiency. Operators can fine-tune the steam injection amount according to the specific conditions of the colloid water treatment to achieve the best negative pressure state, thereby optimizing the flash evaporation and vaporization process of the solvent oil.

[0016] 2. Optimization of the motor and spindle stirring system: The efficient stirring driven by the motor ensures the uniform distribution and full contact of the colloid water in the entire reactor, thereby accelerating the chemical reaction and physical separation process. The beneficial effect of this step is reflected in enhancing the mixing and reaction efficiency of materials, which helps to improve the release speed and thoroughness of the solvent oil in the colloid. The optimization of stirring reduces the problem of local overheating or insufficient reaction, ensures the stability and consistency of the entire condensation process, and lays the foundation for the subsequent low-solvent oil content finished product.

[0017] 3. Fine division of three-phase regions and design of bottom end cap: The main kettle is divided into gas phase region, transition region, liquid phase region, and bottom end cap. This layout optimizes the fluid mechanics characteristics in the reaction space. The existence of the gas phase region promotes the effective volatilization of solvent oil, the transition region helps to better separate the gas and liquid phases, and the liquid phase region concentrates the treated materials for subsequent processing. The bottom end cap design ensures good sealing performance, prevents leakage and optimizes the material flow path. The direct beneficial effect of this step is to improve the separation efficiency and product quality. The refined regional division promotes the continuity and efficiency of reactions at different stages, especially for the flash and vaporization process of solvent oil, which helps to minimize its residue and ensures that the solvent oil content of the colloid water is greatly reduced from condensation to post-processing, and finally reaches a high standard of less than 20ppm, which meets the strict requirements of European and American exports.

[0018] Other features and advantages of the present invention will become apparent from the following detailed description of exemplary embodiments of the present invention with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural schematic diagram provided by the utility model;

[0020] Figure 2It is a schematic diagram of the interior of the steam ejector provided by the utility model;

[0021] Figure 3 It is a three-dimensional schematic diagram of the connecting elbow provided by the utility model;

[0022] Figure 4 It is a three-dimensional schematic diagram of the steam ejector provided by the utility model;

[0023] In the figure: 1. motor; 2. main kettle body; 21. end cover; 22. gas phase zone; 23. liquid phase zone; 24. sight glass; 25. discharge pipe; 26. transition zone; 27. bottom end portion; 28. second diaphragm box pressure gauge; 29. ​​flange; 3. main shaft; 31. stirring blade; 4. steam ejector; 41. receiving chamber; 42. diffusion section; 43. steam inlet pipe; 44. throat section; 45. low-pressure steam inlet; 46. steam nozzle; 47. mixing chamber tapering section; 48. mixing chamber tail; 5. connecting elbow; 51. regulating valve; 52. first diaphragm box pressure gauge. DETAILED DESCRIPTION

[0024] In order to further understand the content, features and effects of the utility model, the following embodiments are given as examples and described in detail with reference to the accompanying drawings.

[0025] like Figures 1 to 4 As shown, a condensation kettle based on steam injection negative pressure regulation provided by an embodiment of the utility model comprises a main kettle body 2, an end cover 21 is connected to the upper part of the main kettle body 2 by bolts, a flange 29 is welded to the upper part of the end cover 21, a steam ejector 4 is connected to the upper part of the flange 29 by flanges and bolts, the steam ejector 4 comprises a steam inlet pipe 43 and a throat portion 44, the steam inlet pipe 43 and the upper part of the throat portion 44 are connected by a connecting elbow 5, a regulating valve 51 is provided on the connecting elbow 5, a receiving chamber 41 is sleeved on the outer side of the steam inlet pipe 43, a motor 1 is connected to the upper part of the end cover 21 by bolts, a main shaft 3 is connected to the lower end of the output shaft of the motor 1 by a coupling, a stirring blade 31 is welded to the outer side of the main shaft 3, a gas phase zone 22 is provided inside the main kettle body 2, a transition zone 26 is provided at the lower part of the gas phase zone 22, a liquid phase zone 23 is provided at the lower part of the transition zone 26, and a bottom end cap 27 is provided at the lower part of the main kettle body 2.

[0026] The construction of the steam injection negative pressure regulation system is creatively conceived: a steam ejector 4 is introduced, high-pressure steam is introduced through the steam inlet pipe 43, and negative pressure is generated by high-speed injection of steam in the throat 44. This design abandons the traditional mechanical vacuum pump and adopts steam power instead, which not only reduces energy consumption but also avoids maintenance problems caused by mechanical wear. The regulating valve 51 on the connecting elbow 5 allows precise control of the steam flow rate, thereby flexibly adjusting the negative pressure level in the kettle, solving the problem of inflexible negative pressure control in traditional condensation kettles.

[0027] The dynamic negative pressure generated by steam injection effectively accelerates the flash evaporation and vaporization process of solvent oil, significantly reducing the residual solvent oil in the colloid water from condensation to post-processing stage, achieving a high standard of solvent oil content ≤ 20ppm, which complies with European and American export regulations.

[0028] The motor 1 drives the main shaft 3 through a coupling, and a stirring blade 31 is welded on the outer side of the main shaft 3. This design ensures uniform mixing of the materials in the kettle and improves the uniformity and efficiency of the reaction.

[0029] A steam nozzle 46 is provided at the right end of the steam inlet pipe 43 , and the steam inlet pipe 43 is connected to the left end of the receiving chamber 41 through a flange.

[0030] The steam nozzle 46 located at the right end of the steam inlet pipe 43 is designed to rapidly accelerate the flow of steam through a small opening to generate a strong local negative pressure. This design not only improves the steam injection efficiency, but also promotes the rapid mixing of steam and the material to be processed in the receiving chamber 41, thereby accelerating the flash evaporation process of the solvent.

[0031] The right side of the receiving chamber 41 is connected to a mixing chamber tapered portion 47 via a flange, and the right side of the mixing chamber tapered portion 47 is fixedly connected to a mixing chamber tail portion 48 .

[0032] The receiving chamber 41 is connected to the steam inlet pipe 43 through a flange, and gradually transitions to the throat section 44 through the mixing chamber tapered section 47 and the mixing chamber tail section 48, forming a gradual flow channel structure. Such a design is conducive to smooth acceleration of steam, reduces eddy current loss, and increases the contact area between steam and material, thereby improving vaporization efficiency.

[0033] The above structure optimizes the conversion of steam energy, converts steam kinetic energy into negative pressure energy more effectively, thereby promoting efficient vaporization and separation of solvent oil and reducing energy consumption.

[0034] The right end of the mixing chamber tail portion 48 is welded to the throat portion 44 , and the diffuser 42 is welded to the right side of the throat portion 44 .

[0035] Flanges are welded to the right end of the diffuser 42 and the left end of the steam inlet pipe 43, respectively.

[0036] A low-pressure steam inlet 45 is welded to the lower portion of the receiving chamber 41 , and a flange is welded to the lower portion of the low-pressure steam inlet 45 .

[0037] By welding a low-pressure steam inlet 45 at the bottom of the receiving chamber 41, fine-tuning of the internal pressure of the system is achieved. Especially when dealing with high-boiling point solvents, the introduction of low-pressure steam helps maintain a stable negative pressure environment, further improving the solvent removal efficiency.

[0038] The receiving chamber 41 and the connecting elbow 5 are respectively connected to a first diaphragm box pressure gauge 52 , and the upper portion of the end cover 21 is fixedly connected to a second diaphragm box pressure gauge 28 .

[0039] The first diaphragm box pressure gauge 52 and the second diaphragm box pressure gauge 28 are respectively arranged on the receiving chamber 41, the connecting elbow 5 and the end cover 21, ensuring the precise control and real-time monitoring of the pressure of the entire system, and effectively avoiding efficiency loss or safety risks caused by overpressure or underpressure.

[0040] A discharge pipe 25 is connected to the left side of the bottom sealing portion 27 , and a plurality of sight glasses 24 are provided on the left side of the main kettle body 2 .

[0041] The design of the discharge pipe 25 connected to the bottom end portion 27 and the plurality of sight glasses 24 arranged on the left side of the main kettle body 2 not only facilitate the discharge of materials in continuous production, but also facilitate the operator to intuitively monitor the material status, ensuring the controllability and safety of the production process.

[0042] When in use, after the left end of the steam inlet pipe 43 is connected to the steam, it is ejected at high speed through the steam nozzle 46. The steam ejector 4 can generate negative pressure and reduce the negative pressure of the main kettle body 2 from the original negative 10kpa to about negative 30 to 50kp through the receiving chamber 41. When the main kettle body 2 is used as the third kettle, the lower the negative pressure of the third kettle, the better the flash evaporation and vaporization effect of the solvent oil from the colloid water, and the lower the solvent oil content in the colloid water from condensation to post-treatment. The steam inlet pipe 43 and the upper part of the throat part 44 are connected by a connecting elbow 5, and a regulating valve 51 is provided on the connecting elbow 5, so that the intensity of the negative pressure can be adjusted.

[0043] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A condensation kettle based on steam injection negative pressure regulation, comprising a main kettle body (2), characterized in that: The upper part of the main kettle body (2) is detachably connected to an end cover (21), the upper part of the end cover (21) is welded with a flange (29), the upper part of the flange (29) is detachably connected to a steam ejector (4), the steam ejector (4) comprises a steam inlet pipe (43) and a throat pipe part (44), the upper part of the steam inlet pipe (43) and the throat pipe part (44) are connected via a connecting elbow (5), the connecting elbow (5) is provided with a regulating valve (51), the outer part of the steam inlet pipe (43) is The side sleeve is provided with a receiving chamber (41); the upper part of the end cover (21) is detachably connected to a motor (1); the lower end of the output shaft of the motor (1) is connected to a main shaft (3) via a coupling; a stirring blade (31) is welded to the outer side of the main shaft (3); a gas phase zone (22) is provided inside the main kettle body (2); a transition zone (26) is provided below the gas phase zone (22); a liquid phase zone (23) is provided below the transition zone (26); and a bottom end portion (27) is provided at the lower part of the main kettle body (2).

2. A condensation kettle based on steam injection negative pressure regulation according to claim 1, characterized in that: A steam nozzle (46) is provided at the right end of the steam inlet pipe (43), and the steam inlet pipe (43) is connected to the left end of the receiving chamber (41) through a flange.

3. A condensation kettle based on steam injection negative pressure regulation according to claim 1, characterized in that: The right side of the receiving chamber (41) is connected to a mixing chamber tapered portion (47) via a flange, and the right side of the mixing chamber tapered portion (47) is fixedly connected to a mixing chamber tail portion (48).

4. A condensation kettle based on steam injection negative pressure regulation according to claim 3, characterized in that: The right end of the mixing chamber tail (48) is welded to the throat portion (44), and the right side of the throat portion (44) is welded with a diffuser (42).

5. A condensation kettle based on steam injection negative pressure regulation according to claim 4, characterized in that: The right end of the diffuser (42) and the left end of the steam inlet pipe (43) are respectively welded with flanges.

6. A condensation kettle based on steam injection negative pressure regulation according to claim 1, characterized in that: A low-pressure steam inlet (45) is welded to the lower portion of the receiving chamber (41), and a flange is welded to the lower portion of the low-pressure steam inlet (45).

7. The condensation kettle based on steam injection negative pressure regulation according to claim 1, characterized in that: The receiving chamber (41) and the connecting elbow (5) are respectively connected to a first diaphragm box pressure gauge (52), and the upper part of the end cover (21) is fixedly connected to a second diaphragm box pressure gauge (28).

8. The condensation kettle based on steam injection negative pressure regulation according to claim 1, characterized in that: The left side of the bottom sealing portion (27) is connected to a discharge pipe (25), and the left side of the main kettle body (2) is provided with a plurality of sight glasses (24).

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