Vacuum vibration drying equipment

Abstract

The utility model relates to the technical field of vacuum drying, and discloses a vacuum vibration drying device which comprises a drying tank and a heating assembly arranged in the drying tank, the heating assembly comprises a plurality of heating pipes arranged at intervals in the first direction, and each heating pipe is arranged to be circuitously bent for multiple times in the second direction perpendicular to the first direction. A medium circulates in the heating pipe, the medium can transfer heat into the drying tank through the heating pipe, and the two ends of the heating pipe penetrate out of the drying tank and are used for being connected with an external heating circulation mechanism. Therefore, the plurality of heating pipes in the drying tank can divide the interior of the drying tank into a plurality of heating areas, so that the heat transfer distance required by each heating pipe is shortened. Therefore, compared with a heating mode of externally arranging a heating sleeve in the prior art, the time for transferring heat to a position far away from a heating source in the drying tank is shortened, so that the drying efficiency of the equipment is improved.

Description

Technical Field

[0001] This utility model relates to the field of vacuum drying technology, and specifically to a vacuum vibration drying device. Background Technology

[0002] In the production process of polyolefin catalysts, drying is a crucial step, primarily aimed at removing a large amount of solvent from the catalyst to obtain a dry powder form. Given the heat-sensitive nature of polyolefin catalysts, the industry commonly employs vacuum vibration drying equipment to process these catalysts, ensuring their performance is not compromised.

[0003] The working principle of a vacuum vibration drying equipment is to evaporate and dry the solvent under vacuum. During the drying process, vibration is applied to the drying tank to force the catalyst into a fluidized state and move within the tank. However, before applying vibration to the drying tank, the solvent level inside the tank needs to be reduced to a certain value to prevent the catalyst from failing to fluidize due to excessive solvent content.

[0004] Currently, external heating is commonly used for the solvent-carrying drying tanks in vacuum vibration drying equipment. Specifically, a heating jacket is installed on the outer wall of the drying tank, and a medium at a certain temperature is circulated through the jacket to heat the catalyst inside the tank. However, this heating method has some problems: due to the low heat transfer efficiency between the solvent and the dried catalyst particles inside the tank, it takes a relatively long time for heat to be transferred from the inner wall of the drying tank to the central area inside, increasing the drying time and thus affecting production efficiency. Utility Model Content

[0005] The purpose of this utility model is to overcome the aforementioned technical problems existing in the prior art.

[0006] To achieve the above objectives, this utility model provides a vacuum vibration drying device including a drying tank and a heating assembly disposed inside the drying tank, the heating assembly including a plurality of heating tubes spaced apart along a first direction;

[0007] Each heating tube is configured to bend and twist multiple times along a second direction perpendicular to the first direction. A medium flows inside the heating tube, which can transfer heat to the drying tank through the heating tube. Both ends of the heating tube extend to the outside of the drying tank and are used to connect with an external heating circulation mechanism.

[0008] Optionally, a set of heat transfer fins is provided on the outer wall surface of each straight section of the heating tube.

[0009] Optionally, each set of heat transfer fins includes multiple heat transfer fins, and the multiple heat transfer fins are arranged at circumferential intervals along the corresponding straight pipe.

[0010] Optionally, the length of the bend at the bottom of the heating tube is greater than the length of the bend at the top of the heating tube.

[0011] Optionally, a drain port is provided at the bottom of the drying tank, and a filter assembly is provided at the drain port.

[0012] Optionally, a fixed platform is provided at the drain outlet, and the filter assembly is detachably mounted on the fixed platform.

[0013] Optionally, the filter assembly includes a filter screen and a retaining ring fitted around the periphery of the filter screen, the retaining ring being detachably connected to the mounting base.

[0014] Optionally, the fixing ring is provided with multiple fixing holes, and each fixing hole is provided with a fixing element, which is used to detachably fix the fixing ring to the fixing platform.

[0015] Optionally, a sealing cover is detachably connected to the mounting platform, the sealing cover is located on the side of the filter assembly away from the drying tank, and a drain valve is provided on the sealing cover.

[0016] Optionally, the vacuum vibration drying equipment also includes a filling / evacuation mechanism for filling or evacuating the drying tank.

[0017] Through the above technical solution, the medium in this invention can directly heat the catalyst from inside the drying tank via heating tubes, thereby reducing heat loss. Simultaneously, the multiple heating tubes within the drying tank divide the interior into multiple heating zones, thus shortening the distance each heating tube needs to transfer heat. Therefore, compared to the external heating method in existing technologies, this invention reduces the time it takes for heat to transfer to locations inside the drying tank far from the heating source, thereby improving the drying efficiency of the equipment. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of a vacuum vibration drying device;

[0019] Figure 2 yes Figure 1 A magnified view of a local area A in the middle;

[0020] Figure 3 This is a schematic diagram of the filter assembly;

[0021] Figure 4 This is a schematic diagram of the heat transfer fins.

[0022] Explanation of reference numerals in the attached figures

[0023] 1. Drying tank; 2. Heating assembly; 201. Heating tube; 2011. Straight tube; 2012. Bend; 202. Rib; 3. Drain outlet; 4. Filter assembly; 401. Filter screen; 402. Fixing ring; 403. Fixing hole; 5. Fixing platform; 6. Fixing component; 601. Bolt; 7. Sealing cover; 701. Drain valve; 8. Air filling and pumping mechanism; 801. Air pump; 802. Dust collector; 803. Condensation assembly; 8031. Condenser; 8032. Vacuum condenser; 804. Gas pipe; 805. Return pipe; 9. Observation mirror. Detailed Implementation

[0024] The specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit the scope of this utility model.

[0025] refer to Figure 1 It can be seen that the vacuum vibration drying equipment of this utility model includes a drying tank 1 and a heating component 2 disposed in the drying tank 1. The heating component 2 includes a plurality of heating tubes 201 arranged at intervals along a first direction.

[0026] Each of the heating tubes 201 is configured to bend and twist multiple times along a second direction perpendicular to the first direction. A medium flows through the heating tube 201, which can transfer heat to the drying tank 1 through the heating tube 201. Both ends of the heating tube 201 extend to the outside of the drying tank 1 and are used to connect with an external heating circulation mechanism.

[0027] The multiple heating tubes 201 can divide the drying tank 1 into multiple large heating areas along the first direction, thereby reducing the distance that each heating tube 201 needs to travel to transfer heat in the first direction.

[0028] The straight tube 2011 portion of each heating tube 201 can divide each large heating area into multiple small heating areas along the second direction, thereby reducing the distance that each straight tube 2011 needs to travel to transmit heat in the second direction.

[0029] Therefore, the medium in this invention can directly heat the catalyst from inside the drying tank 1 through the heating pipe 201, thereby reducing heat loss. Simultaneously, the multiple heating pipes 201 inside the drying tank 1 divide the interior of the drying tank 1 into multiple heating zones, thus shortening the distance each heating pipe 201 needs to transfer heat. Compared to the external heating method in the prior art, this invention reduces the time it takes for heat to transfer to locations far from the heating source inside the drying tank 1, thereby improving the drying efficiency of the equipment.

[0030] In this invention, the first direction is set to be perpendicular to the vertical direction, and the second direction is set to be perpendicular to both the first direction and the vertical direction.

[0031] In some embodiments, reference Figure 1 It can be seen that a set of heat transfer fins 202 are provided on the outer wall surface of each straight tube 2011 of the heating tube 201 to enhance the heat transfer area of ​​each straight tube 2011.

[0032] Among them, reference Figure 4 It can be seen that each group of heat transfer fins 202 includes multiple heat transfer fins 202, and the multiple heat transfer fins 202 are arranged at intervals along the circumference of the corresponding straight tube 2011 to increase the heat transfer area of ​​the heating tube 201, thereby improving the heat transfer capacity of the heating tube 201.

[0033] In this invention, after the catalyst in the drying tank 1 is fluidized, the catalyst at the bottom moves along the second direction, thereby agitating the catalyst above to flow within the tank. Therefore, in this invention, a set of heat transfer fins 202 are correspondingly provided on each straight pipe 2011 section of each heating tube 201, and the bottom side of the heat transfer fins 202 is set at a certain distance from the inner wall of the bottom of the drying tank 1 in the vertical direction to ensure the flow of the catalyst.

[0034] It is understandable that during the flow process, the catalyst can directly contact each straight pipe 2011 and the heat transfer fins 202 installed on it; at the same time, the heat transfer fins 202 can also indirectly agitate the catalyst, thereby breaking up some catalyst that has clumped together due to incomplete drying of moisture, so as to accelerate the rate at which the catalyst is dried and forms dry powder.

[0035] In some embodiments, reference Figure 1 It is known that the lower end bend 2012 of each heating tube 201 is set to be close to the inner wall of the bottom of the drying tank 1, so that the catalyst at the bottom can come into contact with the bend 2012 during the flow process, thereby scouring the outer wall of the bend 2012 along the length of the bend 2012, so as to enhance the convective heat transfer between the medium and the catalyst and improve the heat transfer effect.

[0036] It is understandable that, since the overall length of the heating tube 201 in this utility model is limited by the length of the drying tank 1 along the first direction, while ensuring that the number of straight tubes 2011 of the heating tube 201 is sufficient to meet the heating needs inside the drying tank 1, the length of the bent tube 2012 on the bottom side of the heating tube 201 is set to be greater than the length of the bent tube 2012 on the top side of the heating tube 201, thereby increasing the contact area between the catalyst in a flow state at the bottom of the drying tank 1 and the outer wall of the heating tube 201 during the flow process.

[0037] In some embodiments, the heating tube 201 is made of a material with a certain strength to ensure that the heating tube 201 will not be damaged when it is in a vacuum and pressurized state in the drying tank 1.

[0038] The filter assembly used in Chinese patent CN117899582A is a cylindrical sintered filter head. The sintered filter head is connected to the outside of the drying tank 1 through a drain pipe. The solution is discharged from the filter head and through the drain pipe by pressurizing the body of the drying tank 1.

[0039] However, due to the limited filtration area of ​​the cylindrical filter head, it is easily clogged; and once part of the filter screen 401 of the filter head leaks out of the liquid surface, it will cause gas-liquid entrainment during solid-liquid separation, making it impossible to achieve effective solid-liquid separation, resulting in too much residual solution in the discharged drying tank 1, which increases the drying time.

[0040] And reference Figure 1 It can be seen that the present invention has a drain port 3 at the bottom of the drying tank 1, and a filter assembly 4 can be installed at the drain port 3.

[0041] In this invention, the solution can be discharged from the drying tank 1 through the drain port 3 and the filter assembly 4 by pressurizing the drying tank 1 and / or by utilizing the gravity of the solution itself.

[0042] It is understandable that the solution in the drying tank 1 can always cover the drain port 3 during the drainage process, thereby preventing the drain port 3 from leaking out of the liquid surface too early, causing gas leakage in the drying tank 1 and slowing down the drainage speed.

[0043] Simultaneously, once the liquid level in the tank leaks out through the drain port 3, the gas introduced into the drying tank 1 can also be quickly discharged from the tank through the drain port 3, thus saving time for subsequent vacuuming of the tank. Furthermore, during this process, droplets adhering to the catalyst inside the tank will drip to the bottom of the tank under gravity and leak out from the drain port 3 at the bottom of the drying tank 1, thereby minimizing the solution content inside the tank and reducing the subsequent catalyst drying time.

[0044] In some embodiments, reference Figure 1 and Figure 2 It can be seen that a fixed platform 5 can be provided at the drain outlet 3. The fixed platform 5 is a circular frustum extending vertically downward from the periphery of the drain outlet 3. The filter assembly 4 is detachably mounted on the fixed platform 5 so that it can be replaced after the filter assembly 4 is damaged.

[0045] In some embodiments, reference Figure 3 It is known that the filter assembly 4 may include a filter screen 401 and a fixing ring 402 sleeved around the outer periphery of the filter screen 401. The fixing ring 402 is detachably connected to the fixing platform 5.

[0046] The fixing ring 402 is provided with multiple fixing holes 403, and each fixing hole 403 is provided with a fixing member 6. The fixing member 6 is used to detachably fix the fixing ring 402 to the fixing platform 5.

[0047] The fastener 6 may include a bolt 601, which passes through the fixing hole 403 and is threaded to the fixing platform 5 to detachably fix the fixing ring 402 to the fixing platform 5.

[0048] In some embodiments, a sealing cover 7 is detachably connected to the fixed platform 5. The sealing cover 7 covers the side of the filter assembly 4 away from the drying tank 1 to seal the drain port 3 and the filter assembly 4.

[0049] The sealing cover 7 is equipped with a drain valve 701, which is connected to an external recovery device through a drain pipe to drain the solution from the drying tank 1 into the recovery device.

[0050] In some embodiments, reference Figure 1 It is known that the vacuum vibration drying equipment also includes a filling and evacuation mechanism 8 for filling or evacuating air into the drying tank 1. The filling and evacuation mechanism 8 includes an air pump 801, a dust collector 802, and a condensation component 803. The dust collector 802 is located on the top of the drying tank 1 and communicates with its interior. The condensation component 803 is located between the air pump 801 and the dust collector 802.

[0051] Both the air pump 801 and the dust collector 802 are connected to the condenser assembly 803 via the air pipe 804.

[0052] In some embodiments, the condensation assembly 803 includes a condenser 8031 ​​and a vacuum condenser 8032, with the outlet of the condenser 8031 ​​connected to the inlet of the vacuum condenser 8032 via an air pipe 804.

[0053] The lower end of the vacuum condenser 8032 is connected to a return pipe 805 leading to the condenser 8031. The solvent vapor in the gas pipe 804 enters the first-stage condenser 8031 ​​and the vacuum condenser 8032 in sequence.

[0054] In this invention, steam is first pre-cooled by condenser 8031, and then enters vacuum condenser 8032 through gas pipe 804 for complete cooling. The completely cooled liquid then converges at the bottom of vacuum condenser 8032 and finally flows into primary condenser 8031 ​​through return pipe 805. It is worth noting that the liquid storage section in primary condenser 8031 ​​is separated from the section where steam is pre-cooled.

[0055] In some embodiments, a pressure gauge is provided on the top of the drying tank 1 to monitor the pressure inside the drying tank 1.

[0056] In some embodiments, an observation mirror 9 is also provided on the top of the drying tank 1 for observing the drying conditions inside the drying tank 1.

[0057] In this invention, after the catalyst solvent is filled into the drying tank 1, the drain valve is opened and the gas filling and pumping mechanism 8 is used to fill the drying tank 1 with gas to increase the gas pressure inside the tank and accelerate the draining rate.

[0058] Once the pressure gauge shows that the pressure inside the drying tank 1 has dropped to the value of the outside atmospheric pressure, the drain valve is closed, and air is drawn from the drying tank 1 through the air filling and evacuation mechanism 8 to make the drying tank 1 a vacuum state.

[0059] Subsequently, a medium is introduced into the heating tube 201 to begin the initial drying of the catalyst. Once the operator observes through the observation lens 9 that most of the catalyst surface is free of large amounts of liquid droplets, the vibration mode of the vacuum drying equipment is activated to apply vibration to the drying tank 1 and continue drying through the heating tube 201, thereby obtaining the catalyst in its final dry powder state.

[0060] The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings; however, the present invention is not limited thereto. Within the scope of the technical concept of the present invention, various simple modifications can be made to the technical solution of the present invention. To avoid unnecessary repetition, the present invention will not describe the various possible combinations separately. However, these simple modifications and combinations should also be considered as the content disclosed in the present invention and all fall within the protection scope of the present invention.

Claims

1. A vacuum vibration drying device, characterized in that, It includes a drying tank (1) and a heating assembly (2) disposed within the drying tank (1), the heating assembly (2) including a plurality of heating tubes (201) spaced apart along a first direction; Each of the heating tubes (201) is configured to bend multiple times along a second direction perpendicular to the first direction. A medium flows through the heating tube (201) and can transfer heat to the drying tank (1) through the heating tube (201). Both ends of the heating tube (201) extend to the outside of the drying tank (1) and are used to connect with an external heating circulation mechanism.

2. The vacuum vibration drying equipment according to claim 1, characterized in that, Each straight section (2011) of the heating tube (201) is provided with a set of heat transfer fins (202) on its outer wall surface.

3. The vacuum vibration drying equipment according to claim 2, characterized in that, Each group of heat transfer fins (202) includes multiple heat transfer fins (202), and the multiple heat transfer fins (202) are arranged at circumferential intervals along the corresponding straight pipe (2011).

4. The vacuum vibration drying equipment according to claim 2, characterized in that, The length of the bend (2012) on the bottom side of the heating tube (201) is greater than the length of the bend (2012) on the top side of the heating tube (201).

5. The vacuum vibration drying equipment according to any one of claims 1-4, characterized in that, The bottom of the drying tank (1) is provided with a drain port (3), and a filter assembly (4) is provided at the drain port (3).

6. The vacuum vibration drying equipment according to claim 5, characterized in that, A fixed platform (5) is provided at the drain port (3), and the filter assembly (4) is detachably mounted on the fixed platform (5).

7. The vacuum vibration drying equipment according to claim 6, characterized in that, The filter assembly (4) includes a filter screen (401) and a fixing ring (402) sleeved around the outer periphery of the filter screen (401), wherein the fixing ring (402) is detachably connected to the fixing platform (5).

8. The vacuum vibration drying equipment according to claim 7, characterized in that, The fixing ring (402) is provided with a plurality of fixing holes (403), and each fixing hole (403) is provided with a fixing member (6), which is used to detachably fix the fixing ring (402) on the fixing platform (5).

9. The vacuum vibration drying equipment according to claim 6, characterized in that, A sealing cover (7) is detachably connected to the fixed platform (5). The sealing cover (7) covers the side of the filter assembly (4) away from the drying tank (1). A drain valve (701) is provided on the sealing cover (7).

10. The vacuum vibration drying equipment according to claim 1, characterized in that, The vacuum vibration drying equipment also includes a filling and evacuation mechanism (8) for filling or evacuating air into the drying tank (1).

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