An olefin separation and purification device

Abstract

The invention discloses an olefin separation and purification device, belonging to the technical field of separation and purification; the device comprises a tower body, a support plate is arranged inside the tower body, a baffle is fixedly connected to one side of the support plate, a liquid flow groove is arranged between the outer side of the baffle and the tower body; a liquid leakage prevention pipe is fixedly connected to the top of the support plate, an air inlet groove is arranged at the bottom of the support plate, a rotating shaft is rotatably connected to the bottom of the liquid leakage prevention pipe, and the rotating shaft is located in the air inlet groove; a scraper is fixedly connected to the rotating shaft; a pressure plate is slidably connected to the outer side of the baffle, the pressure plate is connected to a liquid discharge door, and a first slide groove is arranged on the baffle, when the pressure plate moves toward the inside of the baffle under the pressure of the liquid, the liquid discharge door is driven to move, the first slide groove is opened, and the liquid flows out through the first slide groove; the device can prevent bubbles from blocking the air inlet hole and liquid reflux, thereby improving the fractionation efficiency.

Description

Technical Field

[0001] The invention belongs to the technical field of separation and purification and relates to an olefin separation and purification device. Background Art

[0002] During the preparation process of olefins, other hydrocarbons, impurities or by-products are often generated, resulting in reduced product purity. Through the distillation process, the difference in boiling points between olefins and other components can be used to separate olefins from the mixture, thereby improving the purity of the product. In the distillation tower, due to the different boiling points of different components in the mixture, their vaporization and condensation rates in the tower will also be different. The mixture is vaporized by heating, and then the condensation effect is used to condense the steam into liquid, thereby achieving component separation.

[0003] During the distillation process, as the temperature rises, when the temperature reaches the boiling point of a certain type of olefin, the olefin begins to vaporize. During this process, the liquid on the tower plate will continue to accumulate and generate bubbles. As the number of bubbles increases and the liquid layer thickens, the liquid on the tower plate gradually approaches the flooding point, causing the pressure drop in the tower to rise sharply and the efficiency to drop sharply, ultimately leading to a decrease in mass transfer efficiency, affecting the effective separation of the components, and these bubbles will block the pores when passing through them, affecting the circulation of vaporized olefins and their distillation efficiency.

[0004] Therefore, it is necessary to provide a new olefin separation and purification device to solve the above technical problems. Summary of the invention

[0005] The present invention overcomes the shortcomings of the prior art and provides an olefin separation and purification device; the present invention is achieved through the following technical solutions:

[0006] An olefin separation and purification device comprises a tower body, the tower body is connected with a feed pipe, and the top of the tower body is connected with a condenser through a discharge pipe; a support plate is arranged inside the tower body, one side of the support plate is fixedly connected with the inner wall of the tower body, the other side of the support plate is fixedly connected with a baffle, and a liquid flow groove is arranged between the outer side of the baffle and the tower body; a liquid leakage prevention pipe is fixedly connected with the top of the support plate, an air inlet groove with an open bottom is arranged at the bottom of the support plate, an inner tube is connected inside the liquid leakage prevention pipe, an air inlet hole is arranged at the bottom of the inner tube, the air inlet groove is communicated with the air inlet hole, and an air outlet groove is arranged on the side wall of the liquid leakage prevention pipe; the inner tube is communicated with the air outlet groove; a rotating shaft is rotatably connected with the bottom of the liquid leakage prevention pipe, and the rotating shaft is located in the air inlet groove; a scraper is fixedly connected with the rotating shaft;

[0007] A pressure plate is slidably connected to the outside of the baffle, and the pressure plate is fixedly connected to a support block, and the support block is fixedly connected to a return spring, and one end of the return spring away from the support block is connected to the baffle, and the support block is provided with an inclined second slide groove, and a sliding column is slidably connected inside the second slide groove, and one end of the sliding column away from the second slide groove is fixedly connected to a liquid discharge door, and a first slide groove is provided on the baffle, and the liquid discharge door is slidably connected in the first slide groove; when the pressure plate moves toward the inside of the baffle under the pressure of the liquid, the sliding column moves along the second slide groove, driving the liquid discharge door to move obliquely upward along the second slide groove, opening the first slide groove, and the liquid flows out through the first slide groove.

[0008] Furthermore, a plurality of support plates are horizontally arranged inside the tower body along its axial direction, and upper and lower adjacent baffles are arranged in a staggered manner, and the mixed liquid entering the tower body flows downward layer by layer in an S-shaped flow direction through the liquid flow trough.

[0009] Furthermore, a plurality of anti-liquid leakage pipes are fixedly connected to the top of the support plate, and a plurality of air inlet grooves are arranged at the bottom of the support plate, and the positions of the air inlet grooves correspond to the anti-liquid leakage pipes.

[0010] Furthermore, an inwardly concave mounting groove is provided below the outer side of the baffle, a pressure plate is slidably connected in the mounting groove, a support block is fixedly connected to the inner side of the pressure plate, a return spring is fixedly connected to the middle of the inner side of the support block, and the other end of the return spring is fixedly connected to the inner wall of the mounting groove of the baffle.

[0011] Furthermore, inclined second slide grooves are provided on both sides of the left and right sides of the support block, and first slide grooves are provided on both sides of the bottom of the baffle.

[0012] Furthermore, the discharge pipe is fixedly connected with an air inlet pipe, and the air inlet pipe is fixedly connected to the inside of the condenser.

[0013] Furthermore, a reflux pipe is connected between the outlet end of the condenser and the top of the tower body, and the reflux pipe is fixedly connected to a collecting pipe.

[0014] Furthermore, a liquid outlet pipe is fixedly connected to the middle of the bottom of the tower body.

[0015] The beneficial effects of the present invention compared with the prior art are as follows:

[0016] 1. The present invention provides an olefin separation and purification device, which breaks bubbles by installing a liquid leakage prevention pipe, a rotating shaft and a scraper to prevent the rising bubbles from blocking the air inlet and affecting the circulation of steam, thereby improving the distillation efficiency.

[0017] 2. The present invention provides an olefin separation and purification device. By installing a slide chute, a liquid discharge door, a sliding column and a return spring, when liquid flooding occurs inside the device, it is ensured that the liquid flows into the next support plate and does not flow back, so that the distillation tower can operate effectively. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of the external structure of the olefin separation and purification device provided by the present invention;

[0019] Figure 2 for Figure 1 The schematic diagram of the structure inside the tower body shown;

[0020] Figure 3 for Figure 2 A schematic diagram of the structure on the support plate shown;

[0021] Figure 4 for Figure 3 A schematic diagram of the structure of the bottom of the support plate shown;

[0022] Figure 5 for Figure 4 The schematic diagram of the structure of the scraper shown;

[0023] Figure 6 for Figure 3 The schematic diagram of the structure inside the anti-liquid leakage pipe shown;

[0024] Figure 7 for Figure 3 A schematic diagram of the connection structure of the pressing plate shown;

[0025] Figure 8 for Figure 7 Schematic diagram of the connection structure of the drain gate shown.

[0026] Numbers in the figure:

[0027] 1. Tower body; 2. Feed pipe; 3. Condenser; 4. Discharge pipe; 5. Air inlet pipe; 6. Reflux pipe; 7. Liquid outlet pipe; 8. Support plate; 9. Baffle; 10. Liquid leakage prevention pipe; 11. Press plate; 12. First slide groove; 13. Air inlet groove; 14. Rotating shaft; 15. Scraper; 16. Air outlet groove; 17. Air inlet hole; 18. Inner tube; 19. Liquid drain door; 20. Second slide groove; 21. Sliding column; 22. Reset spring; 23. Support block; 24. Collecting pipe; 25. Liquid flow groove. DETAILED DESCRIPTION

[0028] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention clearer, the present invention is further described in detail in conjunction with the embodiments and the accompanying drawings. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention. The technical solutions of the present invention are described in detail below in conjunction with the embodiments and the accompanying drawings, but the scope of protection is not limited thereto.

[0029] See also Figures 1 to 8This embodiment proposes an olefin separation and purification device, including a tower body 1 of a fractionation tower and a condenser 3. A feed pipe 2 is fixedly connected to the middle of the left side of the tower body 1, and the olefin mixture is transported to the inside of the tower body 1 through the feed pipe 2. A liquid outlet pipe 7 is fixedly connected to the middle of the bottom of the tower body 1. After the fractionation is completed, the remaining liquid flows out through the liquid outlet pipe 7. A discharge pipe 4 is fixedly connected to the middle of the top of the tower body 1, and an air inlet pipe 5 is fixedly connected to the right side of the discharge pipe 4. The right end of the air inlet pipe 5 is fixedly connected to the inside of the condenser 3. A reflux pipe 6 is connected between the outlet end of the condenser 3 and the top of the tower body 1, and a collecting pipe 24 is fixedly connected to the right side below the reflux pipe 6.

[0030] A plurality of support plates 8 are horizontally arranged along the axial direction inside the tower body 1, one side of the support plate 8 is fixedly connected to the inner wall of the tower body 1, and the other side of the support plate 8 is fixedly connected to a baffle plate 9, a liquid flow groove 25 is arranged between the outer side of the baffle plate 9 and the tower body 1, and the upper and lower adjacent baffle plates 9 are staggered, and the mixed liquid entering the tower body 1 flows downward layer by layer in an S-shaped direction through the liquid flow groove 25, thereby extending the path of the mixed liquid in the tower body 1.

[0031] A plurality of anti-liquid leakage pipes 10 are fixedly connected to the top of the support plate 8, and a plurality of air inlet grooves 13 with open bottoms are arranged at the bottom of the support plate 8, and the air inlet grooves 13 correspond to the positions of the anti-liquid leakage pipes 10; an inner tube 18 is fixedly connected to the middle of the anti-liquid leakage pipe 10, and an air inlet hole 17 is arranged at the bottom of the inner tube 18, and the top of the air inlet groove 13 is communicated with the air inlet hole 17; a plurality of air outlet grooves 16 are arranged at the lower side of the anti-liquid leakage pipe 10, and the inner tube 18 is communicated with the air outlet groove 16. The steam distilled in the tower body 1 enters the inner tube 18 through the air inlet grooves 13 and the air inlet holes 17, and then the steam is discharged through the air outlet grooves 16; the inner tube 18 can prevent the liquid from flowing back from the anti-liquid leakage pipe 10 to the air inlet groove 13.

[0032] A rotating shaft 14 is rotatably connected to the middle of the bottom of the anti-liquid leakage tube 10, and the rotating shaft 14 is located in the air inlet groove 13. A plurality of scrapers 15 are fixedly connected to the side of the rotating shaft 14. When the steam rises, it enters the air inlet groove 13. Under the action of the airflow, the scraper 15 is pushed from different directions to rotate along the center of the rotating shaft 14, thereby breaking up the bubbles, preventing the bubbles generated when the steam rises from blocking the air inlet hole 17 and affecting the circulation of the steam, thereby improving the efficiency of the distillation.

[0033] A concave mounting groove is provided at the lower outer side of the baffle 9, in which a pressure plate 11 is slidably connected, a support block 23 is fixedly connected to the inner side surface of the pressure plate 11, a return spring 22 is fixedly connected to the middle of the inner side surface of the support block 23, one end of the return spring 22 away from the support block 23 is fixedly connected to the inner wall of the mounting groove of the baffle 9, and inclined second slide grooves 20 are provided on the left and right sides of the support block 23, a sliding column 21 is slidably connected inside the second slide groove 20, and a drainage door 19 is fixedly connected to one end of the sliding column 21 away from the second slide groove 20, and first slide grooves 12 are provided on both sides of the bottom of the baffle 9, and the drainage door 19 is slidably connected inside the first slide groove 12.

[0034] When the amount of liquid in the tower body 1 is too large or too many steam bubbles are generated, liquid overflow occurs inside, and the liquid gradually rises to the pressure plate 11. The pressure plate 11 moves toward the inside of the baffle 9 under the pressure of the liquid, and the pressure plate 11 drives the support block 23 to move toward the inside of the baffle 9. During the movement of the support block 23, the sliding column 21 moves obliquely upward along the second slide groove 20, thereby causing the liquid discharge door 19 to move obliquely upward, and finally the first slide groove 12 is opened, and a part of the liquid can flow out through the first slide groove 12, avoiding the phenomenon of liquid reflux upward, so that the distillation tower can operate normally.

[0035] The working principle of the olefin separation and purification device provided in this embodiment is as follows:

[0036] The olefin mixture is transported to the inside of the tower body 1 through the feed pipe 2. At this time, the temperature inside the tower body 1 begins to rise. The mixture flows to the next support plate 8 through the liquid flow groove 25, so that the mixture flows in an S shape inside the tower body 1. Components with lower boiling points, such as methane and ethane, are evaporated first, and then pass through the air inlet pipe 5 and the condenser 3. Finally, the liquefied methane and ethane are discharged through the collecting pipe 24. As the temperature rises, the target olefins, such as ethylene and propylene, are evaporated within a suitable temperature range, and the evaporated gas enters the air inlet groove 13. The rising steam flow enters the air inlet groove 13 and then drives the scraper 15 to rotate along the center of the rotating shaft 14 to break the bubbles and prevent the rising bubbles from entering the air inlet groove 13. The air hole 17 is blocked, which affects the circulation of steam; then the steam enters the inner tube 18 through the air inlet hole 17, and then is discharged through the air outlet groove 16, finally reaches the discharge pipe 4 and enters the condenser 3 through the air inlet pipe 5. After the steam is condensed into liquid through the condenser 3, a part of it flows out through the collecting pipe 24 and is collected, and the other part flows into the tower body 1 through the reflux pipe 6, which can absorb the excess heat in the tower body 1, help maintain the heat balance in the tower body 1, and ensure that the temperature is stable within an appropriate range; and the steam generated in the tower body 1 contacts the refluxed liquid, and the reverse contact and repeated condensation and vaporization of the gas-liquid two phases on the support plate 8 further improve the purity of olefin separation.

[0037] When the amount of liquid in the tower body 1 is too large or too many steam bubbles are generated, liquid overflow occurs inside, and the liquid gradually reaches the pressing plate 11. The pressing plate 11 moves toward the inside of the baffle 9 under the pressure of the liquid, so that the sliding column 21 moves along the second chute 20, driving the drain door 19 to move obliquely upward along the second chute 20, opening the first chute 12, and the liquid flows out through the first chute 12, ensuring that the liquid flows downward and does not flow back, so that the distillation tower can operate normally.

[0038] The above content is a further detailed description of the present invention in combination with a specific preferred embodiment. It cannot be determined that the specific embodiments of the present invention are limited to this. For ordinary technicians in the technical field to which the present invention belongs, several simple deductions or substitutions can be made without departing from the present invention, which should be regarded as belonging to the present invention and the scope of patent protection determined by the submitted claims.

Claims

1. An olefin separation and purification device, comprising a tower body (1), the tower body (1) being connected to a feed pipe (2), and the top of the tower body (1) being connected to a condenser (3) via a discharge pipe (4); characterized in that: A support plate (8) is provided inside the tower body (1), one side of the support plate (8) is fixedly connected to the inner wall of the tower body (1), the other side of the support plate (8) is fixedly connected to a baffle plate (9), and a liquid flow groove (25) is provided between the outer side of the baffle plate (9) and the tower body (1); a liquid leakage prevention pipe (10) is fixedly connected to the top of the support plate (8), an air inlet groove (13) with an open bottom is provided at the bottom of the support plate (8), an inner pipe (18) is connected inside the liquid leakage prevention pipe (10), an air inlet hole (17) is provided at the bottom of the inner pipe (18), the air inlet groove (13) is communicated with the air inlet hole (17), and an air outlet groove (16) is provided on the side wall of the liquid leakage prevention pipe (10); the inner pipe (18) is communicated with the air outlet groove (16); a rotating shaft (14) is rotatably connected to the bottom of the liquid leakage prevention pipe (10), and the rotating shaft (14) is located in the air inlet groove (13); and a scraper (15) is fixedly connected to the rotating shaft (14); A pressure plate (11) is slidably connected to the outside of the baffle (9), and a support block (23) is fixedly connected to the pressure plate (11). A return spring (22) is fixedly connected to the support block (23). One end of the return spring (22) away from the support block (23) is connected to the baffle (9). The support block (23) is provided with an inclined second slide groove (20). A sliding column (21) is slidably connected inside the second slide groove (20). One end of the sliding column (21) away from the second slide groove (20) is fixedly connected to a liquid discharge door (19). A first slide groove (12) is provided on the baffle (9), and the liquid discharge door (19) is slidably connected inside the first slide groove (12). When the pressure plate (11) moves toward the inside of the baffle (9) under the pressure of the liquid, the sliding column (21) moves along the second slide groove (20), driving the liquid discharge door (19) to move obliquely upward along the second slide groove (20), thereby opening the first slide groove (12) and allowing the liquid to flow out through the first slide groove (12).

2. An olefin separation and purification device according to claim 1, characterized in that: A plurality of support plates (8) are horizontally arranged along the axial direction of the tower body (1), and upper and lower adjacent baffles (9) are arranged in a staggered manner. The mixed liquid entering the tower body (1) flows downward layer by layer in an S-shaped direction through the liquid flow grooves (25).

3. An olefin separation and purification device according to claim 1, characterized in that: A plurality of anti-liquid leakage pipes (10) are fixedly connected to the top of the support plate (8), and a plurality of air inlet grooves (13) are arranged at the bottom of the support plate (8), wherein the positions of the air inlet grooves (13) correspond to the positions of the anti-liquid leakage pipes (10).

4. An olefin separation and purification device according to claim 1, characterized in that: An inwardly concave mounting groove is provided below the outer side of the baffle plate (9), a pressure plate (11) is slidably connected in the mounting groove, a support block (23) is fixedly connected to the inner side surface of the pressure plate (11), a return spring (22) is fixedly connected to the middle of the inner side surface of the support block (23), and the other end of the return spring (22) is fixedly connected to the inner wall of the mounting groove of the baffle plate (9).

5. An olefin separation and purification device according to claim 4, characterized in that: The left and right sides of the support block (23) are both provided with inclined second slide grooves (20), and the bottom sides of the baffle plate (9) are both provided with first slide grooves (12).

6. An olefin separation and purification device according to claim 1, characterized in that: The discharge pipe (4) is fixedly connected to an air inlet pipe (5), and the air inlet pipe (5) is fixedly connected to the inside of the condenser (3).

7. An olefin separation and purification device according to claim 1 or 6, characterized in that: A reflux pipe (6) is connected between the outlet end of the condenser (3) and the top of the tower body (1), and the reflux pipe (6) is fixedly connected to a collecting pipe (24).

8. An olefin separation and purification device according to claim 1, characterized in that: A liquid outlet pipe (7) is fixedly connected to the middle of the bottom of the tower body (1).

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