Energy-saving double-jet-pump steam stripping system

Abstract

The invention discloses an energy-saving double-jet-pump steam stripping system which comprises a device body, an annular rotating seat is arranged at the top of the device body, a plurality of vertical rods are connected to the bottom of the annular rotating seat, a plurality of first flow guide discs are fixedly connected among the vertical rods, annular material accumulation discs are arranged at the bottoms of the first flow guide discs, and a plugging disc is arranged in the annular rotating seat. A guide air pipe is fixedly arranged above the plugging disc, an air supply pipe is movably arranged on the plugging disc in a penetrating mode, the top of the air supply pipe is movably arranged in the guide air pipe in a penetrating mode, a lifting device is arranged on the plugging disc, a plurality of second flow guide discs are fixedly connected to the air supply pipe, and every two first flow guide discs and every two second flow guide discs form a group; the upper openings of the second flow guide discs in the same group are located above the lower openings of the first flow guide discs, and the second flow guide discs are provided with material splashing blocks extending into the annular material accumulation discs. The steam stripping system can fully improve the steam stripping efficiency on the premise of avoiding flooding.

Description

Technical Field

[0001] The present invention belongs to the technical field of stripping systems, and specifically relates to an energy-saving double ejector pump stripping system. Background Art

[0002] In the fields of chemical production, pharmaceutical industry, and food processing, etc., stripping is a commonly used separation technology, mainly used to remove volatile components from liquid mixtures. The commonly used equipment for stripping is a stripping column. The principle of the stripping column is mainly to use a gas medium to disrupt the original gas-liquid two-phase equilibrium, establish a new gas-liquid equilibrium state, so that a certain component in the solution is desorbed due to the reduction of partial pressure, thereby achieving the purpose of separating substances.

[0003] In the traditional stripping process, steam is mostly used as the stripping medium, and a large amount of steam is introduced into the bottom of the stripping column at one time. This will not only cause the flooding phenomenon, but also a large amount of steam may carry out the solution to be stripped out of the top of the column or blow over the trays; a large amount of steam enters the column, and the temperature and pressure in the stripping column exceed the limit, which will lead to uneven contact or too long contact time between the solution to be stripped and the steam, and the temperature of the solution to be stripped is too high, thus affecting the quality of the finished solution obtained from the bottom of the stripping column. For this reason, CN115350494A discloses a segmented stripping device and a segmented stripping method. This stripping device avoids the occurrence of the flooding phenomenon by setting stripping steam pipes at different heights of the stripping column, and then introducing the stripping medium in segments through the stripping steam pipes at different heights and adjusting the pressure of each segment of the stripping medium. However, although this segmented stripping device can avoid the occurrence of the flooding phenomenon, since the steam inlet position of some of the stripping steam pipes is not at the bottom and cannot contact the solution to be stripped that has fallen below it, in fact, the contact between the steam entering from the upper stripping steam pipes and the solution to be stripped is insufficient, resulting in a reduction in its stripping efficiency, an increase in the stripping time, and being unfavorable for energy conservation. Summary of the Invention

[0004] Aiming at the deficiencies of the prior art, the present invention provides an energy-saving double ejector pump stripping system, which can make the contact between steam and the solution to be stripped more sufficient, and fully improve the stripping efficiency on the premise of avoiding flooding.

[0005] To solve the above technical problems, the present invention is solved by the following technical solutions: An energy-saving double jet pump stripping system, including a device main body, a circular rotating seat is arranged at the top of the device main body, and a driving structure for rotating the circular rotating seat is arranged on the device main body. A plurality of vertical rods are connected to the bottom of the circular rotating seat, and a plurality of first diversion plates arranged with a larger upper part and a smaller lower part are fixedly connected between the plurality of vertical rods. An annular material accumulation plate with an upward opening is arranged at the bottom of the first diversion plate. A blocking plate is arranged in the circular rotating seat, a guiding air pipe connecting the jet pump is fixedly arranged above the blocking plate, an air supply pipe penetrates through the blocking plate movably, the top of the air supply pipe penetrates through the guiding air pipe movably, and a lifting device for driving the air supply pipe to lift and lower is arranged on the blocking plate. A plurality of second diversion plates arranged with a larger upper part and a smaller lower part are fixedly connected to the air supply pipe located in the device main body. The first diversion plates and the second diversion plates are grouped in pairs, and the upper opening of the second diversion plate in the same group is located above the lower opening of the first diversion plate, and splash blocks for splashing the materials in the material accumulation plate are arranged on the second diversion plate and extend into the annular material accumulation plate. This energy-saving double jet pump stripping system feeds the liquid to be stripped from the top of the device main body through a feed pipe, provides steam through the jet pump and enters the bottom of the device main body through the air supply pipe. The liquid to be stripped flows from top to bottom, and the steam flows from bottom to top. By driving the circular rotating seat to rotate through the driving structure, the first diversion plate rotates. Part of the liquid to be stripped is spread on the first diversion plate due to the centrifugal force, expanding the contact area with the steam. The rest of the liquid to be stripped will accumulate in the material accumulation plate during the downward flow. During the rotation of the first diversion plate, the splash blocks will hit the liquid to be stripped in the material accumulation plate and splash it to generate mist, expanding its contact area with the steam, thereby further improving the stripping efficiency. When generating mist, the steam will carry the mist and rise, resulting in easy occurrence of flooding. To avoid the flooding phenomenon, the second diversion plate is lifted and lowered through the lifting device, so that the size of the gap between the first diversion plate and the second diversion plate and the depth of the splash block extending into the material accumulation plate can be adjusted. When flooding is about to occur, the second diversion plate can be lifted, thereby reducing the steam flow rate in the gap between the first diversion plate and the second diversion plate, and reducing the depth of the splash block extending into the material accumulation plate, reducing the generation of mist, thereby avoiding flooding and enabling the liquid to be stripped to flow downward smoothly. When flooding does not occur, the second diversion plate can be moved downward as much as possible, so that more liquid to be stripped splashes, generating more mist and increasing the steam flow rate, thereby increasing the contact area between the liquid to be stripped and the steam and improving the stripping efficiency. That is to say, on the premise of avoiding flooding, the gap between the first diversion plate and the second diversion plate can be reduced as much as possible to fully improve the stripping efficiency.

[0006] In the above technical solution, preferably, the driving structure includes a first motor fixed to the device main body, a first gear located on the output shaft of the first motor, and a gear ring fixed to the annular rotating seat, and the first gear meshes with the gear ring. The rotation of the first motor is used to drive the rotation of the gear ring, thereby driving the rotation of the annular rotating seat, and the structure is simple and convenient to drive.

[0007] In the above technical solution, preferably, the lifting device includes a second motor fixed to the plugging disc, a screw rod connected to the output shaft of the second motor, and a lifting bracket fixedly connected to the air supply pipe, and the screw rod is in threaded cooperation with the lifting bracket. Adopting this structure can realize the lifting of the air supply pipe through the forward and reverse rotation of the second motor and the threaded cooperation between the screw rod and the lifting bracket, and further realize the adjustment of the gap between the first diversion disc and the second diversion disc.

[0008] In the above technical solution, preferably, a lifting rod penetrating the plugging disc is arranged on the lifting bracket, and a plurality of distribution discs are arranged on the lifting rod and are in one-to-one cooperation with the lower openings of the second diversion disc. The distribution disc is a cylindrical part with a closed bottom, an open top, and a plurality of distribution holes on the side wall, and the side wall of the distribution disc matches the lower opening of the second diversion disc. Arranging the distribution disc at the lower opening of the second diversion disc enables the stripping liquid to be dispersed and flow out through the distribution holes on the distribution disc, further increasing the contact surface between the stripping liquid and the steam, and connecting the lifting rod and the lifting bracket, so that the distribution disc can be lifted and lowered synchronously when the air supply pipe is lifted and lowered.

[0009] In the above technical solution, preferably, the lifting rod includes an upper rod and a lower rod that are elastically connected, and a plurality of the distribution discs are fixed to the lower rod. Adopting this structure causes the lower rod to descend when there is a large amount of stripping liquid accumulated in the distribution disc, increasing the number of distribution holes through which the stripping liquid can flow out, promoting the downward flow of the stripping liquid, and avoiding the occurrence of flooding.

[0010] In the above technical solution, preferably, the center of the bottom of the distribution disc protrudes upward. The upward protrusion of the center of the distribution disc enables a relatively large pressure to be generated at the bottom when a small amount of stripping liquid is accumulated, making the stripping liquid flow out of the distribution holes faster.

[0011] In the above technical solution, preferably, there are at least two guiding air pipes, and each guiding air pipe is separately connected to a jet pump. Adopting this structure can provide another structure to avoid flooding, that is, by controlling the number of jet pumps turned on to adjust the steam flow rate. When flooding is about to occur, one of the jet pumps is turned off to reduce the steam flow rate, thereby avoiding the occurrence of flooding.

[0012] In the above technical solution, preferably, a plurality of spoiler baffles are radially arranged on the first flow guiding disc. By arranging the spoiler baffles, the liquid to be stripped can be splashed, the contact surface between the liquid to be stripped and the steam can be increased, and the stripping efficiency can be further improved.

[0013] In the above technical solution, preferably, a heating jacket is arranged on the main body of the device. By arranging the heating jacket, the temperature inside the main body of the device can be maintained at a set temperature for stripping.

[0014] Compared with the prior art, the present invention has the following beneficial effects: In this energy-saving double ejector stripping system, the liquid to be stripped is fed into the top of the main body of the device through the feed pipe, and the steam is provided by the ejector and enters the bottom of the main body of the device through the air supply pipe. The liquid to be stripped flows from top to bottom, and the steam flows from bottom to top. By driving the annular rotating seat to rotate through the driving structure, the first flow guiding disc rotates. Part of the liquid to be stripped is spread on the first flow guiding disc due to the centrifugal force, expanding the contact area with the steam. The rest of the liquid to be stripped will accumulate in the material accumulating tray during the downward flow. During the rotation of the first flow guiding disc, the splash block will impact the liquid to be stripped in the material accumulating tray to splash it and generate mist, expanding its contact area with the steam, thereby further improving the stripping efficiency. When generating mist, the steam will carry the mist and rise, resulting in easy occurrence of flooding. To avoid the flooding phenomenon, the second flow guiding disc is lifted and lowered through the lifting device, so that the size of the gap between the first flow guiding disc and the second flow guiding disc and the depth of the splash block extending into the material accumulating tray can be adjusted. When flooding is about to occur, the second flow guiding disc can be lifted, thereby reducing the steam flow rate in the gap between the first flow guiding disc and the second flow guiding disc, and reducing the depth of the splash block extending into the material accumulating tray, reducing the generation of mist, thereby avoiding flooding and enabling the liquid to be stripped to flow smoothly downward. When flooding does not occur, the second flow guiding disc can be moved downward as much as possible, so that more liquid to be stripped splashes, generating more mist and increasing the steam flow rate, thereby increasing the contact area between the liquid to be stripped and the steam and improving the stripping efficiency. That is to say, on the premise of avoiding flooding, the gap between the first flow guiding disc and the second flow guiding disc can be reduced as much as possible to fully improve the stripping efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the overall structure of an embodiment of the present invention.

[0016] Figure 2 It is a schematic diagram of a partial cross-sectional structure of an embodiment of the present invention.

[0017] Figure 3 It is Figure 2 a partial enlarged view of

[0018] Figure 4 It is a schematic diagram of another partial cross-sectional structure of an embodiment of the present invention.

[0019] Figure 5 Schematic diagram of the connection structure between the vertical rod and the first flow guide disc in the embodiment of the present invention. Specific implementation manners

[0020] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific implementation manners: Refer to Figures 1 to 5, an energy-saving double-injection pump stripping system, including a device main body 1. The interior of the device main body 1 has a cavity for stripping. The bottom of the device main body 1 has a discharge pipeline. A ring-shaped rotating seat 2 is arranged at the top of the device main body 1. A driving structure for rotating the ring-shaped rotating seat 2 is arranged on the device main body 1. Six vertical rods 3 evenly distributed are connected to the bottom of the ring-shaped rotating seat 2. Three first guide plates 4 with a larger upper part and a smaller lower part are fixedly connected between the six vertical rods 3. An annular material accumulating plate 5 with an upward opening is arranged at the bottom of the first guide plate 4. The upper opening of the first guide plate 4 is close to and fits the inner wall of the device main body 1. A blocking plate 6 is arranged in the ring-shaped rotating seat 2. A feed pipe 7 and an exhaust pipe 8 are arranged at a position close to the top of the device main body 1. In this embodiment, the exhaust pipe 8 is connected to the blocking plate 6, and the feed pipe 7 is connected to the side surface of the device main body 1 close to the top. The inlet of the feed pipe 7 is higher than the three first guide plates 4. The feed pipe 7 pumps the liquid to be stripped from the side through a liquid supply pump. The feed pipe 7 is connected to a liquid storage tank for the liquid to be stripped, and the liquid storage tank for the stripping liquid can be connected to the discharge pipeline to achieve cyclic stripping. A guiding air pipe 10 connected to an injection pump 9 is fixedly arranged above the blocking plate 6. An air supply pipe 11 is movably penetrated through the blocking plate 6. The top of the air supply pipe 11 is movably penetrated into the guiding air pipe 10. A lifting device for driving the air supply pipe 11 to lift is arranged on the blocking plate 6. Three second guide plates 12 with a larger upper part and a smaller lower part are fixedly connected to the air supply pipe 11 located in the device main body 1. The first guide plates 4 and the second guide plates 12 are grouped in pairs. The upper opening of the second guide plate 12 in the same group is located above the lower opening of the first guide plate 4, and splash blocks 13 for splashing the materials in the annular material accumulating plate 5 are arranged on the second guide plate 12 and extend into the annular material accumulating plate 5. To improve the splash effect, inclined upward slopes are provided on both sides of the splash block 13 in the material receiving direction.This energy-saving double-injection pump 9 stripping system feeds the liquid to be stripped from the top of the device main body 1 through the feed pipe 7, and provides steam through the injection pump 9 to enter the bottom of the device main body 1 through the air supply pipe 11. The liquid to be stripped flows from top to bottom, and the steam flows from bottom to top. By driving the annular rotating seat 2 to rotate through the driving structure, the first guide disk 4 rotates. Part of the liquid to be stripped is evenly spread on the first guide disk 4 due to the centrifugal force, expanding the contact area with the steam. The remaining liquid to be stripped will accumulate in the material accumulation disk 5 during the downward flow. During the rotation of the first guide disk 4, the splash block 13 will impact the liquid to be stripped in the material accumulation disk 5 to splash it to generate mist, expanding its contact area with the steam, thereby further improving the stripping efficiency. When generating mist, the steam will carry the mist upward, resulting in easy occurrence of flooding. To avoid the flooding phenomenon, the second guide disk 12 is lifted and lowered through the lifting device, so that the size of the gap between the first guide disk 4 and the second guide disk 12 and the depth of the splash block 13 extending into the material accumulation disk 5 can be adjusted. That is, when flooding is about to occur, the second guide disk 12 can be lifted, thereby reducing the steam flow rate in the gap between the first guide disk 4 and the second guide disk 12, and reducing the depth of the splash block extending into the material accumulation disk, reducing the generation of mist, thereby avoiding flooding, enabling the liquid to be stripped to flow downward smoothly. When flooding does not occur, the second guide disk 12 can be moved downward as much as possible, so that more liquid to be stripped splashes, generating more mist and increasing the steam flow rate, thereby increasing the contact surface between the liquid to be stripped and the steam, improving the stripping efficiency. That is to say, on the premise of avoiding flooding, the gap between the first guide disk 4 and the second guide disk 12 can be reduced as much as possible to fully improve the stripping efficiency.

[0021] See Figure 1 and Figure 2 , in this embodiment, the driving structure includes a first motor 14 fixed to the device main body 1, a first gear 15 located on the output shaft of the first motor 14, and a gear ring 16 fixed to the annular rotating seat 2. The first gear 15 meshes with the gear ring 16. By rotating the first motor 14 to drive the rotation of the gear ring 16, the annular rotating seat 2 is driven to rotate, and the structure is simple and convenient to drive.

[0022] See Figure 1 and Figure 2 , in this embodiment, the lifting device includes a second motor 17 fixed to the plugging disk 6, a screw rod 18 connected to the output shaft of the second motor 17, and a lifting bracket 19 fixedly connected to the air supply pipe 11. The screw rod 18 is in threaded cooperation with the lifting bracket 19. Adopting this structure can realize the lifting of the air supply pipe 11 through the forward and reverse rotation of the second motor 17 and the threaded cooperation between the screw rod 18 and the lifting bracket 19, and further realize the adjustment of the gap between the first guide disk 4 and the second guide disk 12.

[0023] See Figure 2, in this embodiment, a lifting rod 20 penetrating the plugging disc 6 is arranged on the lifting bracket 19. Three material distributing discs 21 which are in one-to-one correspondence with the lower openings of the second diversion disc 12 are arranged on the lifting rod 20. The material distributing disc 21 is a cylindrical member with a closed bottom, an open top and a plurality of material distributing holes 22 on the side surface. The side wall of the material distributing disc 21 matches the lower opening of the second diversion disc 12. By arranging the material distributing disc 21 at the lower opening of the second diversion disc 12, the stripping liquid to be stripped entering the second diversion disc 12 can be dispersed and flowed out through the material distributing holes 22 on the material distributing disc 21, further increasing the contact surface between the stripping liquid to be stripped and the steam, and connecting the lifting rod 20 with the lifting bracket 19, so that the material distributing disc 21 can be lifted and lowered synchronously when the air supply pipe 11 is lifted and lowered.

[0024] See Figure 2 and Figure 3 , in this embodiment, the lifting rod 20 includes an upper rod 23 and a lower rod 24 which are elastically connected. The three material distributing discs 21 are fixed on the lower rod 24. Specifically, the upper end of the lower rod 24 penetrates into the hole at the lower end of the upper rod 23 and is connected between the upper rod 23 and the lower rod 24 through a spring 25. With this structure, when more stripping liquid to be stripped accumulates in the material distributing disc 21, the lower rod 24 descends, increasing the number of material distributing holes 22 through which the stripping liquid to be stripped can flow out, promoting the downward flow of the stripping liquid to be stripped and avoiding the occurrence of the flooding phenomenon.

[0025] See Figure 4 , in this embodiment, the center of the bottom of the material distributing disc 21 protrudes upward. The upward protrusion of the center of the material distributing disc 21 enables a relatively large pressure to be generated at the bottom when a small amount of stripping liquid accumulates, so that the stripping liquid flows out of the material distributing holes faster.

[0026] There are at least two guiding air pipes 10, and each guiding air pipe 10 is separately connected to a jet pump 9. In this embodiment, there are two guiding air pipes 10, and each guiding air pipe 10 is separately connected to a jet pump 9. Of course, in other embodiments, there can be more guiding air pipes 10 and jet pumps 9 connected in one-to-one correspondence. With this structure, another structure for avoiding the flooding phenomenon can be provided, that is, by controlling the number of jet pumps 9 turned on to adjust the steam flow rate. When the flooding phenomenon is about to occur, one of the jet pumps 9 is turned off to reduce the steam flow rate, thereby avoiding the occurrence of the flooding phenomenon.

[0027] In this embodiment, a plurality of flow disturbing baffles 26 are radially arranged on the first diversion disc 4. By arranging the flow disturbing baffles 26, the stripping liquid to be stripped can be splashed, increasing the contact surface between the stripping liquid to be stripped and the steam, and further improving the stripping efficiency.

[0028] In this embodiment, a heating jacket 27 is arranged on the device main body 1. By arranging the heating jacket 27, the temperature inside the device main body 1 can be maintained at a set temperature for stripping.

[0029] The above are only the preferred embodiments of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the principle of the present invention, several improvements and refinements can be made, and these improvements and refinements should also be regarded as the protection scope of the present invention.

Claims

1. An energy-saving dual-jet pump stripping system, comprising a device body (1), characterized in that: An annular rotating seat (2) is arranged at the top of the device body (1), and a driving structure for rotating the annular rotating seat (2) is arranged on the device body (1). A plurality of vertical rods (3) are connected to the bottom of the annular rotating seat (2), and a plurality of first guide plates (4) arranged with a larger top and a smaller bottom are fixedly connected between the vertical rods (3). An annular material accumulation plate (5) with an opening facing upward is arranged at the bottom of the first guide plate (4). A blocking plate (6) is arranged inside the annular rotating seat (2), and a guide air pipe (10) connected to a jet pump (9) is fixedly arranged above the blocking plate (6). An air supply pipe (11) is movably passed through the blocking plate (6), and the air supply pipe (11) is movably passed through the sealing plate (6). The top of the air pipe (11) is movably inserted into the guide air pipe (10); the sealing plate (6) is provided with a lifting device for driving the air supply pipe (11) to rise and fall; the air supply pipe (11) located in the device body (1) is fixedly connected with a plurality of second guide plates (12) arranged with a larger top and a smaller bottom; the first guide plates (4) and the second guide plates (12) are arranged in groups of two; the upper openings of the second guide plates (12) in the same group are located above the lower openings of the first guide plates (4); and the second guide plates (12) are provided with splash blocks (13) extending into the annular material accumulation plate (5) for splashing materials in the material accumulation plate (5).

2. An energy-saving dual-jet pump stripping system as claimed in claim 1, characterized in that: The driving structure comprises a first motor (14) fixed on the device body (1), a first gear (15) located on the output shaft of the first motor (14), and a ring gear (16) fixed on the annular rotating seat (2), wherein the first gear (15) meshes with the ring gear (16).

3. An energy-saving dual-jet pump stripping system as claimed in claim 1, characterized in that: The lifting device comprises a second motor (17) fixed to the sealing disk (6), a screw rod (18) connected to an output shaft of the second motor (17), and a lifting bracket (19) fixedly connected to the air supply pipe (11), the screw rod (18) being threadedly matched with the lifting bracket (19).

4. An energy-saving dual-jet pump stripping system as claimed in claim 3, characterized in that: The lifting bracket (19) is provided with a lifting rod (20) that penetrates the blocking plate (6); the lifting rod (20) is provided with a plurality of material distribution plates (21) that match the lower opening of the second guide plate (12) one by one; the material distribution plates (21) are cylindrical parts with a closed bottom, an open top and a plurality of material distribution holes (22) on the side; the side wall of the material distribution plate (21) matches the lower opening of the second guide plate (12).

5. An energy-saving dual-jet pump stripping system as claimed in claim 4, characterized in that: The lifting rod (20) comprises an upper rod (23) and a lower rod (24) which are elastically connected, and a plurality of the material distribution trays (21) are fixed on the lower rod (24).

6. An energy-saving dual-jet pump stripping system as claimed in claim 4, characterized in that: The center of the bottom of the material distribution plate (21) protrudes upward.

7. An energy-saving dual-jet pump stripping system as claimed in claim 1, characterized in that: There are at least two guide air pipes (10), and each of the guide air pipes (10) is independently connected to a jet pump (9).

8. An energy-saving dual-jet pump stripping system as claimed in claim 1, characterized in that: Several interfering flow baffles (26) are radially arranged on the first guide disc (4).

9. An energy-saving dual-jet pump stripping system as claimed in claim 1, characterized in that: The device body (1) is provided with a heating jacket (27).

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