A methanol to olefin gas separation device

Abstract

The utility model provides a kind of methanol to olefin gas separation device, belong to gas separation equipment technical field.The utility model methanol to olefin gas separation device, including pretreatment device and separator, import is provided on pretreatment device, the inside of pretreatment device is provided with activated carbon filter screen and water absorption layer, drying cabinet is also provided on the lateral wall of pretreatment device, the lateral wall of drying cabinet is provided with several heaters, the outlet end of each heater is uniformly provided with heating rod, the inside top end and bottom end of drying cabinet are uniformly provided with rotating column, the end of rotating column, which is set on the inside top end and bottom end of drying cabinet and mutually close, is uniformly provided with fan leaf.The utility model solves the problem that water absorption layer needs to be replaced frequently, resulting in the problem of reduced separation efficiency of methanol to olefin gas separation device.

Description

Technical Field

[0001] This utility model belongs to the technical field of gas separation equipment, specifically relating to a methanol-to-olefins gas separation device. Background Technology

[0002] In recent years, although olefin production has shown a trend of diversification both domestically and internationally, non-steam cracking hydrocarbon production methods, represented by methanol-to-olefins (MTO), remain an important method for olefin production. MTO refers to a chemical process technology that uses methanol synthesized from coal or natural gas as feedstock and employs a fluidized bed reaction similar to a catalytic cracking unit to produce low-carbon olefins. Its main products are ethylene and propylene. The pretreatment unit is a crucial part of a methanol-to-olefins plant. Its main function is to remove impurities from the feedstock gas or waste gas to ensure the smooth operation of subsequent processes and the purity of the products. These impurities may include moisture, sulfides, particulate matter, and other volatile organic compounds (VOCs).

[0003] Existing methanol-to-olefins gas separation devices can remove impurities from the gas through a water-absorbing layer and an activated carbon filter, but the water-absorbing layer needs to be replaced frequently, which leads to a decrease in the separation efficiency of the methanol-to-olefins gas separation device. Utility Model Content

[0004] The purpose of this invention is to provide a methanol-to-olefins gas separation device to solve the problem in the prior art that the water absorption layer needs to be replaced frequently, which leads to a decrease in the separation efficiency of the methanol-to-olefins gas separation device.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] In a first aspect, this utility model provides a methanol-to-olefins gas separation device, including a pretreatment device and a separator. The pretreatment device is provided with an inlet, and a first connecting member is provided on the side wall of the pretreatment device. One end of the first connecting member is connected to the pretreatment device, and the other end of the first connecting member is connected to the separator. A second connecting member is provided on the side wall of the separator. One end of the second connecting member is connected to the separator, and the other end of the second connecting member is connected to a drying device. A third connecting member is provided on the side wall of the drying device. One end of the third connecting member is connected to the drying device, and the other end of the third connecting member is connected to a separation tower.

[0007] The pretreatment device is equipped with an activated carbon filter and a water-absorbing layer inside.

[0008] The pretreatment device is also equipped with a drying box on its side wall. Several heaters are provided on the side wall of the drying box. Each heater has a heating rod at its outlet end. Rotating columns are provided at the top and bottom of the drying box. Fan blades are provided at the ends of the rotating columns at the top and bottom of the drying box that are close to each other.

[0009] The outer surface of the rotating column is provided with a first bevel gear, which meshes with a second bevel gear. The second bevel gear is provided with a rotating shaft, which is rotatably connected to the drying box. One end of the rotating shaft is provided with a first sprocket, which meshes with a first chain. The top center of the drying box is provided with a motor, and the output shaft of the motor is connected to the rotating column. The pretreatment device is also provided with a hydraulic cylinder, and the output end of the hydraulic cylinder is connected to the water absorption layer.

[0010] A first rack is provided on the side of the absorbent layer facing the outside of the pretreatment device. A first groove is formed on one side of the pretreatment device near the first rack, and a first guide rail is embedded in the first groove. The first rack is slidably connected to the first groove. A rotating rod is rotatably connected in the first groove. A first gear is fixedly connected to the outer surface of the rotating rod. The first gear meshes with the first rack. A second rack is fixedly connected on the side of the activated carbon filter facing the outside of the pretreatment device. A second groove is formed on one side of the pretreatment device near the second rack, and a second guide rail is embedded in the second groove. The second groove is slidably connected to the second rack. A rotating rod is rotatably connected in the second groove. A second gear is fixedly connected to the outer surface of the rotating rod. The second gear meshes with the second rack. A second sprocket and a third sprocket are fixedly connected to the bottom ends of the rotating rod and the rotating rod, respectively. A second chain meshes with the second sprocket and the third sprocket.

[0011] A further improvement of this utility model is that the first connecting member, the second connecting member, and the third connecting member are all connecting pipes.

[0012] A further improvement of this utility model is that the inlet is equipped with a fan.

[0013] A further improvement of this invention is that the drying device includes several drying units, each of which includes a gas phase dryer and a condensate dryer, and the drying units are connected in parallel or in series.

[0014] A further improvement of this invention is that a sealing strip is provided on the side of the activated carbon filter screen facing the outside of the pretreatment device.

[0015] A further improvement of this invention is that the sealing strip has a rectangular structure.

[0016] A further improvement of this invention is that the activated carbon filter has a honeycomb porous structure.

[0017] A further improvement of this utility model is that the absorbent layer includes a metal mesh basket and several layers of spherical silicone. The metal mesh basket has several vertical partitions inside, which form several independent chambers, and each independent chamber is filled with spherical silicone.

[0018] A further improvement of this invention is that the heater is a duct-type gas electric heater.

[0019] A further improvement of this invention is that the heating rod is a finned stainless steel electric heating tube assembly.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] Compared with existing methanol-to-olefins (MTO) gas separation devices, this invention features a pretreatment device and a separator. The pretreatment device includes an activated carbon filter and a water-absorbing layer. A drying chamber is mounted on the side wall of the pretreatment device, with several heaters on the side wall. Each heater has a heating rod at its outlet. Rotating columns are located at the top and bottom of the drying chamber, with fan blades at their closest points. This invention allows two rotating columns (at the top and bottom of the drying chamber) to simultaneously rotate, driving two fan blades to evenly blow hot air from the heating rods onto the water-absorbing layer, drying it and restoring its absorbency. This effectively solves the problem of frequent water-absorbing layer replacement in existing technologies, which reduces the separation efficiency of MTO gas separation devices. Furthermore, this invention uses a second gear to move a second rack forward, which in turn moves the activated carbon filter forward, pushing it out for easy replacement. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the main structure of the methanol-to-olefins gas separation device of this utility model;

[0023] Figure 2 This is a rear view schematic diagram of the methanol-to-olefins gas separation device of this utility model;

[0024] Figure 3 This is a schematic diagram of the main structure of the drying box in the methanol-to-olefins gas separation device of this utility model;

[0025] Figure 4This is a rear view schematic diagram of the drying chamber in the methanol-to-olefins gas separation device of this utility model;

[0026] Figure 5 This utility model Figure 2 Enlarged structural diagram of section A;

[0027] Figure 6 This utility model Figure 2 Enlarged structural diagram of section B;

[0028] Figure 7 This is a schematic diagram of the activated carbon filter structure in the methanol-to-olefins gas separation device of this utility model;

[0029] Figure 8 This is a schematic diagram of the water-absorbing layer structure in the methanol-to-olefins gas separation device of this utility model;

[0030] In the diagram: 1. Pretreatment device; 2. Inlet; 3. First connecting pipe; 4. Separator; 5. Second connecting pipe; 6. Gas phase dryer; 7. Condensate dryer; 8. Third connecting pipe; 9. Separation tower; 10. Drying box; 11. Heater; 12. Heating rod; 13. Electric motor; 14. Rotating column; 15. Fan blade; 16. Rotating shaft; 17. First sprocket; 18. First chain; 19. Hydraulic cylinder; 20. First rack; 21. First gear; 22. Rotating rod; 23. Second rack; 24. Second gear; 25. Rotating rod; 26. Second sprocket; 27. Second chain; 28. Third sprocket; 29. ​​Sealing strip; 30. First bevel gear; 31. Second bevel gear. Detailed Implementation

[0031] To further understand the present invention, the following detailed description is provided in conjunction with the accompanying drawings and specific embodiments. It should be understood that the embodiments are merely illustrative and not intended to limit the scope of the invention.

[0032] The methanol-to-olefins gas separation device proposed in this invention includes an activated carbon filter and a water-absorbing layer inside the pretreatment unit. A drying chamber is also installed on the side wall of the pretreatment unit, with several heaters mounted on its side wall. Each heater has a heating rod at its outlet. Rotating columns are installed at both the top and bottom of the drying chamber, with fan blades at the ends of the rotating columns closest to each other. Compared with existing technologies, this invention effectively solves the problem of reduced separation efficiency in methanol-to-olefins gas separation devices due to the need for frequent replacement of the water-absorbing layer.

[0033] Example 1:

[0034] This embodiment discloses a methanol-to-olefins gas separation device. A front view schematic diagram of the methanol-to-olefins gas separation device in this embodiment is shown below. Figure 1 As shown in the figure, the rear view of the methanol-to-olefins gas separation device in this embodiment is as follows. Figure 2 As shown, the technical solution of this utility model is specifically described as follows:

[0035] This embodiment of the methanol-to-olefins gas separation device includes a pretreatment device 1 and a separator 4. The pretreatment device 1 is provided with an inlet 2. A first connecting member (in this embodiment, the first connecting member is a first connecting pipe 3) is provided on the side wall of the pretreatment device 1. One end of the first connecting member is connected to the pretreatment device 1, and the other end of the first connecting member is connected to the separator 4. A second connecting member (in this embodiment, the second connecting member is a second connecting pipe 5) is provided on the side wall of the separator 4. One end of the second connecting member is connected to the separator 4, and the other end of the second connecting member is connected to a drying device. A third connecting member (in this embodiment, the third connecting member is a third connecting pipe 8) is provided on the side wall of the drying device. One end of the third connecting member is connected to the drying device, and the other end of the third connecting member is connected to a separation tower 9.

[0036] The drying device in this embodiment includes several drying units, each of which includes a gas phase dryer 6 and a condensate dryer 7. The drying units are connected in parallel or in series. Figure 1 Let's take a drying unit as an example.

[0037] The pretreatment device 1 is equipped with an activated carbon filter and a water-absorbing layer.

[0038] A drying chamber 10 is also provided on the side wall of the pretreatment device 1. Several heaters 11 are provided on the side wall of the drying chamber 10 (in this embodiment, two heaters 11 are provided on the side wall of the drying chamber 10; the number of heaters 11 can be adjusted according to actual needs). A heating rod 12 is provided at the outlet end of each heater 11. Rotating columns 14 are provided at both the top and bottom of the drying chamber 10. Fan blades 15 are provided at the ends of the rotating columns 14 located close to each other at the top and bottom of the drying chamber 10. A schematic diagram of the main structure of the drying chamber is shown below. Figure 3 As shown, the rear view of the drying oven is shown in the diagram. Figure 4 As shown.

[0039] A first bevel gear 30 is provided on the outer surface of the rotating column 14. The first bevel gear 30 is meshed with a second bevel gear 31. A rotating shaft 16 is provided on the second bevel gear 31 (specifically, the end near the transmission end of the second bevel gear 31 in this embodiment). The rotating shaft 16 is rotatably connected to the drying chamber 10. A first sprocket 17 is provided on one end of the rotating shaft 16. The first sprocket 17 is meshed with a first chain 18. A motor 13 is provided at the top center of the drying chamber 10. The output shaft of the motor 13 is connected to the rotating column 14. A hydraulic cylinder 19 is also provided inside the pretreatment device 1. The output end of the hydraulic cylinder 19 is connected to the water absorption layer. Figure 2 A magnified structural diagram of part A is shown below. Figure 5 As shown.

[0040] A first rack 20 is provided on the side of the absorbent layer facing the outside of the pretreatment device 1 (specifically, the center of the left side in this embodiment). A first groove is provided on one side of the pretreatment device 1 (specifically, the left side in this embodiment) near the first rack 20. A first guide rail is embedded in the first groove to achieve sliding engagement with the first rack 20. The first rack 20 is slidably connected to the first groove. A rotating rod 22 is rotatably connected in the first groove. A first gear 21 is fixedly connected to the outer surface of the rotating rod 22. The first gear 21 meshes with the first rack 20. A second rack 23 is fixedly connected to the side of the activated carbon filter facing the outside of the pretreatment device 1 (specifically, the rear center in this embodiment). A second groove is formed on one side of the pretreatment device 1 (specifically, the rear side in this embodiment) near the second rack 23. A second guide rail is embedded in the second groove to achieve a sliding engagement with the second rack 23. The second groove and the second rack 23 are slidably connected. A rotating rod 25 is rotatably connected to the second groove. A second gear 24 is fixedly connected to the outer surface of the rotating rod 25. The second gear 24 meshes with the second rack 23. A second sprocket 26 and a third sprocket 28 are fixedly connected to the bottom ends of the rotating rod 25 and the rotating rod 22, respectively. A second chain 27 is meshed between the second sprocket 26 and the third sprocket 28. Figure 2 A magnified structural diagram of part B is shown below. Figure 6 As shown.

[0041] In this embodiment, a sealing strip 29 is provided on the side of the activated carbon filter facing the outside of the pretreatment device 1 (specifically, the front end in this embodiment). The sealing strip 29 has a rectangular structure.

[0042] In this embodiment, the activated carbon filter uses modified activated carbon with a high specific surface area, which is formed into a honeycomb porous structure through extrusion molding or compression molding. A schematic diagram of the activated carbon filter structure is shown below. Figure 7 As shown.

[0043] In this embodiment, the absorbent layer includes a metal mesh basket and several layers of spherical silicone. The output end of the hydraulic cylinder 19 is fixedly connected to the metal mesh basket. Several vertical partitions are arranged inside the metal mesh basket, forming several independent chambers. Each independent chamber is filled with spherical silicone. A schematic diagram of the absorbent layer structure is shown below. Figure 8 As shown.

[0044] In this embodiment, heater 11 is a duct-type gas electric heater.

[0045] In this embodiment, the heating rod 12 is a finned stainless steel electric heating tube assembly. The finned stainless steel electric heating tube assembly has high-efficiency heat exchange, precise temperature control and explosion-proof characteristics, which are perfectly suited to the regeneration requirements of the pretreatment device 1.

[0046] When the heater 11 is started, the current is input into the finned stainless steel electric heating tube assembly (heating rod 12) through the power interface. The electric heating alloy wire heats up and transfers the heat through the magnesium oxide layer to the stainless steel tube wall. The stainless steel tube wall rapidly diffuses the heat through the fins to form a uniform thermal radiation field. The fan blade 15 drives the airflow to penetrate the gap between the fins, thereby realizing forced convection heat transfer.

[0047] The specific working principle of the methanol-to-olefins gas separation device in this embodiment is explained as follows:

[0048] When using a methanol-to-olefins gas separation unit, the methanol-to-olefins gas enters the pretreatment unit 1 through inlet 2, where the moisture in the gas is removed by the water absorption layer, and then the sulfides in the gas are adsorbed by the activated carbon filter.

[0049] When the water-absorbing layer has poor adsorption effect, the heater 11 and hydraulic cylinder 19 are started. The output end of the hydraulic cylinder 19 drives the water-absorbing layer to move into the drying chamber 10. The motor 13 is started. The output shaft of the motor 13 drives the rotating column 14 to rotate. The rotating column 14 drives the first bevel gear 30 to rotate and drives the second bevel gear 31 to rotate. The second bevel gear 31 drives the rotating shaft 16 to rotate, so that the first sprocket 17 drives the first sprocket 17 to rotate through the first chain 18. The rotating shaft 16 drives the second bevel gear 31 and drives the first bevel gear 30 to rotate. The two rotating columns 14 can rotate at the same time, driving the two fan blades 15 to rotate at the same time, blowing the hot air of the heating rod 12 evenly onto the water-absorbing layer to dry it and restore its water absorption.

[0050] As the absorbent layer moves into the drying chamber 10, it drives the first rack 20 to move to one side, causing the first gear 21 to rotate. The first gear 21 drives the rotating rod 22 to rotate, which in turn drives the third sprocket 28 to rotate. The third sprocket 28 drives the second sprocket 26 to rotate via the second chain 27. The second sprocket 26 drives the rotating rod 25 to rotate, which in turn drives the second gear 24 to rotate. The second gear 24 drives the second rack 23 to move forward, which in turn moves the activated carbon filter forward and pushes it out, allowing the activated carbon filter to be replaced.

[0051] The methanol-to-olefins gas enters the separator 4 through the first connecting pipe 3, where it is separated into a condensate and a gas phase. The condensate mainly contains heavier components, while the gas phase mainly contains lighter olefins. These components then enter the gas phase dryer 6 and the condensate dryer 7 through two second connecting pipes 5, respectively, to further remove residual moisture from the condensate and gas phase. Finally, the gas enters the separation tower 9 through two third connecting pipes 8. Through the action of the separation tower 9, the olefin components in the gas phase can be gradually purified, ultimately yielding high-purity ethylene and propylene products.

[0052] Example 2:

[0053] In this embodiment, inlet 2 is equipped with a fan, which helps the methanol-to-olefins gas to enter the pretreatment device 1 more quickly. Other details of this embodiment are the same as in embodiment 1.

[0054] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and not to limit it. Although the utility model has been described in detail with reference to the above embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the specific implementation of this utility model. Any modifications or equivalent substitutions that do not depart from the spirit and scope of this utility model should be covered within the protection scope of the claims of this utility model.

Claims

1. A methanol to olefins gas separation apparatus, characterized by, The device includes a pretreatment device (1) and a separator (4). The pretreatment device (1) is provided with an inlet (2). A first connecting member is provided on the side wall of the pretreatment device (1). One end of the first connecting member is connected to the pretreatment device (1), and the other end of the first connecting member is connected to the separator (4). A second connecting member is provided on the side wall of the separator (4). One end of the second connecting member is connected to the separator (4), and the other end of the second connecting member is connected to a drying device. A third connecting member is provided on the side wall of the drying device. One end of the third connecting member is connected to the drying device, and the other end of the third connecting member is connected to a separation tower (9). The pretreatment device (1) is equipped with an activated carbon filter and a water-absorbing layer inside; The pretreatment device (1) is also provided with a drying box (10) on its side wall. Several heaters (11) are provided on the side wall of the drying box (10). Each heater (11) has a heating rod (12) at its outlet end. Rotating columns (14) are provided at the top and bottom of the drying box (10). Fan blades (15) are provided at the ends of the rotating columns (14) at the top and bottom of the drying box (10) that are close to each other. The outer surface of the rotating column (14) is provided with a first bevel gear (30), the first bevel gear (30) is meshed with a second bevel gear (31), the second bevel gear (31) is provided with a rotating shaft (16), the rotating shaft (16) is rotatably connected to the drying box (10), one end of the rotating shaft (16) is provided with a first sprocket (17), the first sprocket (17) is meshed with a first chain (18), the top middle of the drying box (10) is provided with a motor (13), the output shaft of the motor (13) is connected to the rotating column (14), and the interior of the pretreatment device (1) is also provided with a hydraulic cylinder (19), the output end of the hydraulic cylinder (19) is connected to the water absorption layer; A first rack (20) is provided on the side of the absorbent layer facing the outside of the pretreatment device (1). A first groove is provided on one side of the pretreatment device (1) near the first rack (20). A first guide rail is embedded in the first groove. The first rack (20) is slidably connected to the first groove. A rotating rod (22) is rotatably connected in the first groove. A first gear (21) is fixedly connected to the outer surface of the rotating rod (22). The first gear (21) meshes with the first rack (20). A second rack (23) is fixedly connected to the side of the activated carbon filter facing the outside of the pretreatment device (1). A second groove is provided on one side near the second rack (23). A second guide rail is embedded in the second groove. The second groove is slidably connected to the second rack (23). A rotating rod (25) is rotatably connected in the second groove. A second gear (24) is fixedly connected to the outer surface of the rotating rod (25). The second gear (24) meshes with the second rack (23). A second sprocket (26) and a third sprocket (28) are fixedly connected to the bottom ends of the rotating rod (25) and the rotating rod (22), respectively. A second chain (27) meshes with the second sprocket (26) and the third sprocket (28).

2. The methanol to olefins gas separation device of claim 1, wherein, The first, second, and third connecting parts are all connecting pipes.

3. The methanol-to-olefins gas separation device according to claim 1, characterized in that, The inlet (2) is equipped with a fan.

4. The methanol-to-olefins gas separation device according to claim 1, characterized in that, The drying device includes several drying units, each of which includes a gas phase dryer (6) and a condensate dryer (7), and the drying units are connected in parallel or in series.

5. The methanol-to-olefins gas separation device according to claim 1, characterized in that, A sealing strip (29) is provided on the side of the activated carbon filter facing the outside of the pretreatment device (1).

6. The methanol-to-olefins gas separation apparatus according to claim 5, characterized in that, The sealing strip (29) has a rectangular structure.

7. The methanol-to-olefins gas separation apparatus according to claim 1, characterized in that, The activated carbon filter has a honeycomb porous structure.

8. The methanol-to-olefins gas separation apparatus according to claim 1, characterized in that, The absorbent layer includes a metal mesh basket and several layers of spherical silicone. The metal mesh basket has several vertical partitions inside, which form several independent chambers. Each independent chamber is filled with spherical silicone.

9. The methanol-to-olefins gas separation apparatus according to claim 1, characterized in that, The heater (11) is a duct-type gas electric heater.

10. The methanol-to-olefins gas separation apparatus according to claim 1, characterized in that, The heating rod (12) is a finned stainless steel electric heating tube assembly.

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