A double-effect feed preheater for MTBE device

Abstract

The present invention relates to the technical field of MTBE preparation equipment, and in particular to a double-effect feed preheater for an MTBE device, comprising a tank body, a heat-insulating shell fixedly installed at the lower part of the tank body, a partition plate fixedly installed at the middle part of the tank body, an inner cylinder arranged below the partition plate, and a transmission assembly arranged at the top of the tank body, wherein the transmission assembly comprises a sealing box fixedly connected to the top of the tank body and a reciprocating screw rotatably connected to the top of the tank body. The present invention promotes the filtering effect of the conical filter screen and the annular filter screen so that solid impurities in the raw materials during feeding will only exist in the space formed by the conical filter screen and the annular filter screen, and will not enter the inner cylinder, thereby ensuring that there will be no solid impurities inside the inner cylinder and at the bottom of the tank body, so that there will be no solid impurities in the material finally discharged from the discharge pipe, thereby ensuring the normal operation of the device and the quality of the MTBE product.

Description

Technical Field

[0001] The invention relates to the technical field of MTBE preparation equipment, in particular to a double-effect feed preheater for an MTBE device. Background Art

[0002] The MTBE unit double-effect feed preheater is mainly used to preheat the raw materials entering the reactor to ensure that the reaction is carried out at a suitable temperature. Preheating can increase the reactivity of the raw materials and promote the reaction, thereby improving the production efficiency and product quality of MTBE. In addition, the preheater can also help stabilize the reaction temperature and extend the service life of the catalyst.

[0003] The Chinese utility model patent with publication number CN212512594U discloses a double-effect feed preheater for MTBE device, which aims to solve the problem of stabilizing reaction temperature. It includes a heat exchange tube spirally wound around the outer periphery of the raw material storage tank, a steam inlet pipe is provided at one end of the heat exchange tube connected to steam, a steam outlet pipe is provided at one end of the heat exchange tube away from the steam inlet pipe, a cold water inlet pipe is provided at either end of the heat exchange tube, a cold water outlet pipe is provided at the other end of the heat exchange tube, a cold water inlet pipe and a cold water outlet pipe are both provided with a cold water valve, and a steam outlet pipe and a steam inlet pipe are both provided with a steam valve. The utility model has the effect of stabilizing reaction temperature and extending the service life of the catalyst.

[0004] However, the above prior art still has the following problems:

[0005] The raw materials entering the double-effect feed preheater of the MTBE unit may contain some trace amounts of solid impurities. These solid impurities may come from the production process, such as incompletely reacted raw materials, catalyst residues, salts in the reaction process, etc. If there are too many solid impurities in the raw materials, it may have adverse effects on the preheater, such as blocking the pipeline and reducing the heat transfer efficiency. Therefore, before the raw materials enter the preheater, it should be ensured that they have been fully pretreated and quality controlled to meet production requirements. In order to ensure the normal operation of the double-effect feed preheater of the MTBE unit and the quality of the MTBE product, it is necessary to remove solid impurities and other harmful substances. Summary of the invention

[0006] The technical problem to be solved by the present invention is: in order to solve the problem that the raw materials in the double-effect feed preheater of the MTBE device may contain some trace solid impurities, and these solids may have adverse effects on the preheater, the present invention provides a double-effect feed preheater for the MTBE device.

[0007] The present invention provides a double-effect feed preheater for an MTBE device, comprising a tank body, a heat-insulating shell is fixedly installed at the lower part of the tank body, a partition plate is fixedly installed at the middle part of the tank body, an inner cylinder is arranged below the partition plate, a transmission assembly is arranged at the top of the tank body, the transmission assembly comprises a sealing box fixedly connected to the top of the tank body and a reciprocating screw rotatably connected to the top of the tank body, a reciprocating screw thread is provided on the outer wall of the reciprocating screw, the reciprocating screw passes through the middle part of the sealing box, and a plurality of fan blades are fixedly installed at the top of the reciprocating screw. The lower end of the reciprocating screw is rotatably connected to the partition plate, the upper part of the tank body is connected to a feed pipe, and one end of the feed pipe passes through the partition plate, the bottom of the tank body is connected to a discharge pipe, a heating pipe is spirally wound in the insulation shell, the upper end of the heating pipe passes through the insulation shell and the tank body in turn and extends into the sealed box, the lower end of the heating pipe passes through the insulation shell and is provided with a steam outlet, the side of the sealed box away from the upper end of the heating pipe is connected to a steam inlet pipe, one end of the steam inlet pipe passes through the tank body and is connected to an external steam source.

[0008] Furthermore, a first filter assembly is provided at the top of the inner cylinder, a second filter assembly is provided at the bottom of the inner cylinder, an annular plate is slidably provided on the inner cylinder, a plurality of through openings are evenly provided on the annular plate, each of the through openings is provided with an opening and closing assembly capable of closing the through opening, and a pushing assembly for pushing the annular plate is provided on the reciprocating screw.

[0009] Furthermore, the first filter assembly includes a first ring and a conical filter screen, a first annular groove is provided at the bottom of the first ring, a plurality of first springs are arranged in the first annular groove, the first ring is slidably connected to the top of the inner cylinder through the first annular groove, and the conical filter screen is fixedly installed on the top of the first ring.

[0010] Furthermore, the second filter assembly includes a second ring and an annular filter screen, a second annular groove is provided on the upper portion of the second ring, a plurality of second springs are arranged in the second annular groove, the second ring is slidably connected to the bottom of the inner cylinder through the second annular groove, the annular filter screen is fixedly mounted on the outer side of the second ring, and the outer wall of the annular filter screen is in contact with the inner wall of the tank body, connecting blocks are fixedly mounted on both sides of the lower portion of the inner cylinder, and the ends of the two connecting blocks that are away from each other are fixedly connected to the inner wall of the tank body, and sliding grooves are provided on both sides of the second ring, and each of the sliding grooves is slidably matched with the corresponding connecting block.

[0011] Furthermore, the opening and closing assembly includes two rotating plates and two limiting blocks, the two limiting blocks are respectively fixedly mounted on both sides of the through opening, and the two rotating plates are respectively rotatably connected to the two limiting blocks.

[0012] Furthermore, the pushing assembly includes a sleeve and two connecting rods, the sleeve is threadedly connected to the reciprocating screw, one end of the two connecting rods is fixedly connected to the sleeve, and the other end of the two connecting rods is fixedly connected to the annular plate, and an opening for accommodating the two connecting rods is opened on the partition plate.

[0013] Furthermore, the top of the insulation shell is connected to a water inlet pipe, and the bottom of the insulation shell is connected to a water outlet pipe, and both the water inlet pipe and the water outlet pipe are provided with a one-way liquid inlet valve.

[0014] Furthermore, a one-way air inlet valve is provided at the lower end of the heating tube and on the steam inlet pipe.

[0015] The beneficial effects of the present invention are:

[0016] 1. The present invention promotes the filtering effect of the cone filter and the annular filter by the push assembly, so that the solid impurities in the raw material will only exist in the space formed by the cone filter and the annular filter during feeding, and will not enter the inner cylinder, thereby ensuring that there will be no solid impurities inside the inner cylinder and at the bottom of the tank body, so that there will be no solid impurities in the material finally discharged from the discharge pipe, thereby ensuring the normal operation of the device and the quality of the MTBE product;

[0017] 2. The up and down movement of the annular plate promotes the raw materials in the tank, so that the raw materials can circulate inside and outside the inner cylinder, so that the raw materials are heated more evenly during the preheating process. In addition, the raw materials circulate continuously, so that the solid impurities inside them will only exist in the space formed by the conical filter and the annular filter, and will not enter the inner cylinder, so that there will be no solid impurities in the materials finally discharged from the bottom of the tank;

[0018] 3. After the cooling work is completed, the cold water is discharged through the outlet pipe. This design ensures that steam and cold water will not mix in the same heat exchange tube, thus avoiding potential problems caused by medium mixing, such as unstable temperature control and equipment damage. At the same time, it also enables the preheater to respond more flexibly to different production needs, both heating the raw materials through steam and adjusting the temperature of the raw materials through cold water. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0020] Figure 1 A three-dimensional diagram of a double-effect feed preheater for an MTBE device provided by the present invention;

[0021] Figure 2 is a cross-sectional view of the tank body of the present invention;

[0022] Figure 3 It is a cross-sectional view of the inner cylinder in the present invention;

[0023] Figure 4 for Figure 3 Enlarged view of point A in the middle;

[0024] Figure 5 for Figure 3 Enlarged view of point B in the middle;

[0025] Figure 6 It is a schematic diagram of the working state of the annular plate sliding downward in the present invention;

[0026] Figure 7 It is a schematic diagram of the working state of the annular plate sliding upward in the present invention.

[0027] 1. The invention relates to a novel type of air filter comprising a plurality of cylinders, a plurality of cylinders, and a plurality of cylinders. The plurality of cylinders are connected to a plurality of cylinders and a plurality of cylinders. The plurality of cylinders are connected to a plurality of cylinders and a plurality of cylinders. The plurality of cylinders are connected to a plurality of cylinders and a plurality of cylinders. The plurality of cylinders are connected to a plurality of cylinders and a plurality of cylinders. DETAILED DESCRIPTION

[0028] The technical solution of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0029] In this embodiment, if Figures 1 to 7As shown, the double-effect feed preheater of the MTBE device includes a tank body 1, a heat preservation shell 2 is fixedly installed at the lower part of the tank body 1, a partition plate 10 is fixedly installed in the middle part of the tank body 1, an inner cylinder 3 is arranged below the partition plate 10, and a transmission assembly 4 is arranged on the top of the tank body 1, and the transmission assembly 4 includes a sealing box 41 fixedly connected to the top of the tank body 1 and a reciprocating screw 42 rotatably connected to the top of the tank body 1, and the outer wall of the reciprocating screw 42 is provided with a reciprocating thread, and the reciprocating screw 42 passes through the middle part of the sealing box 41, and a plurality of fan blades 43 are fixedly installed on the top of the reciprocating screw 42. The lower end of the reciprocating screw 42 is rotatably connected to the partition plate 10. The upper part of the tank body 1 is connected to a feed pipe 11, and one end of the feed pipe 11 passes through the partition plate 10. The bottom of the tank body 1 is connected to a discharge pipe 12. A heating pipe 23 is spirally wound in the insulation shell 2. The upper end of the heating pipe 23 passes through the insulation shell 2 and the tank body 1 in turn and extends into the sealed box 41. The lower end of the heating pipe 23 passes through the insulation shell 2 and is provided with a steam outlet. The side of the sealed box 41 away from the upper end of the heating pipe 23 is connected to a steam inlet pipe 24. One end of the steam inlet pipe 24 passes through the tank body 1 and is connected to an external steam source. During preheating, the steam used for heating enters from the steam inlet pipe 24 and blows the fan blades 43 in the sealed box 41, causing the reciprocating screw 42 to rotate.

[0030] Specifically, a first filter assembly 6 is provided at the top of the inner cylinder 3, a second filter assembly 7 is provided at the bottom of the inner cylinder 3, an annular plate 8 is slidably provided on the inner cylinder 3, a plurality of openings are evenly provided on the annular plate 8, each of the openings is provided with an opening and closing assembly 9 capable of closing the opening, and a pushing assembly 5 for pushing the annular plate 8 is provided on the reciprocating screw 42. Before preheating, raw materials are first added from the feed pipe 11 above the tank body 1, and the raw materials will pass through the first filter assembly 6 and the second filter assembly 7 to fill the lower part of the tank body 1.

[0031] Specifically, the first filter assembly 6 includes a first ring 61 and a conical filter screen 62. A first annular groove 63 is provided at the bottom of the first ring 61. A plurality of first springs 64 are provided in the first annular groove 63. The first ring 61 is slidably connected to the top of the inner tube 3 through the first annular groove 63. The conical filter screen 62 is fixedly installed on the top of the first ring 61.

[0032] Specifically, the second filter assembly 7 includes a second ring 71 and an annular filter 72. The upper portion of the second ring 71 is provided with a second annular groove 73. A plurality of second springs 74 are arranged in the second annular groove 73. The second ring 71 is slidably connected to the bottom of the inner tube 3 through the second annular groove 73. The annular filter 72 is fixedly mounted on the outer side of the second ring 71, and the outer wall of the annular filter 72 is fitted with the inner wall of the tank body 1. Connecting blocks 31 are fixedly mounted on both sides of the lower portion of the inner tube 3. The ends of the two connecting blocks 31 that are away from each other are fixedly connected to the inner wall of the tank body 1. Slide grooves 75 are provided on both sides of the second ring 71. Each of the slide grooves 75 is slidably matched with the corresponding connecting block 31.

[0033] Specifically, the opening and closing assembly 9 includes two rotating plates 91 and two limiting blocks 92 . The two limiting blocks 92 are respectively fixedly mounted on both sides of the through opening, and the two rotating plates 91 are respectively rotatably connected to the two limiting blocks 92 .

[0034] Specifically, the pushing assembly 5 includes a sleeve 51 and two connecting rods 52, the sleeve 51 is threadedly connected to the reciprocating screw 42, one end of the two connecting rods 52 is fixedly connected to the sleeve 51, and the other end of the two connecting rods 52 is fixedly connected to the annular plate 8, and an opening for accommodating the two connecting rods 52 is opened on the partition plate 10.

[0035] By pushing the component 5 to cooperate with the filtering effect of the conical filter 62 and the annular filter 72, the solid impurities in the raw materials during feeding will only exist in the space formed by the conical filter 62 and the annular filter 72, and will not enter the inner tube 3, ensuring that there will be no solid impurities inside the inner tube 3 and at the bottom of the tank body 1, so that there will be no solid impurities in the material finally discharged from the discharge pipe 12, ensuring the normal operation of the device and the quality of the MTBE product. During preheating, the steam used for heating enters from the steam inlet pipe 24 and blows the fan blades 43 in the sealing box 41, so that the reciprocating screw 42 rotates. During the rotation of the reciprocating screw 42, the sleeve 51 will move up and down, wherein the partition plate 10 is arranged to prevent solid impurities from adhering to the reciprocating threads on the reciprocating screw 42, affecting the normal operation of the equipment, and the opening on the partition plate 10 can also limit the connecting rod 52.

[0036] In the process of the sleeve 51 moving up and down, the connecting rods 52 arranged on both sides of the sleeve 51 will drive the annular plate 8 to move up and down. When the annular plate 8 moves upward, it will touch the first ring 61 on the first filter assembly 6, so that it will move slightly upward through the sliding fit of the first annular groove 63 and the top of the inner cylinder 3, driving the conical filter 62 to move together. After the annular plate 8 descends, under the action of the first spring 64, the first ring 61 moves downward again, so that the first filter assembly 6 produces a shaking effect as a whole, thereby preventing the solid impurities on the top of the conical filter 62 from being blocked. The filter holes on the conical filter 62 affect the circulation of the raw materials; when the annular plate 8 moves downward, it will touch the second ring 71 on the second filter assembly 7, causing it to move slightly downward through the sliding fit of the second annular groove 73 and the bottom of the inner cylinder 3, driving the annular filter 72 to move together. After the annular plate 8 rises, under the action of the second spring 74, the second ring 71 moves upward again, causing the second filter assembly 7 to vibrate as a whole, preventing the solid impurities on the upper part of the annular filter 72 from clogging the filter holes on the annular filter 72 and affecting the circulation of the raw materials. At the same time, due to the sliding fit of the chute 75 and the connecting block 31, the second ring 71 will not separate from the bottom of the inner cylinder 3.

[0037] And the opening and closing assembly 9 on the annular plate 8 can work together with the annular plate 8. When the annular plate 8 descends, the rotating plate 91 on the opening and closing assembly 9 will close to block the opening. When the annular plate 8 rises, the rotating plate 91 will open downward and limit the rotation angle of the rotating plate 91 within ninety degrees through the limit block 92, allowing the raw materials and solid impurities to flow. The up and down movement of the annular plate 8 promotes the raw materials in the tank body 1, so that the raw materials can circulate inside and outside the inner cylinder 3, so that the raw materials are heated more evenly during the preheating process. In addition, the raw materials are continuously circulated, so that the solid impurities inside them will only exist in the space formed by the conical filter screen 62 and the annular filter screen 72, and will not enter the inner cylinder 3, so that there will be no solid impurities in the material finally discharged from the bottom of the tank body 1.

[0038] More specifically, the top of the insulation shell 2 is connected to a water inlet pipe 21 , and the bottom of the insulation shell 2 is connected to a water outlet pipe 22 . Both the water inlet pipe 21 and the water outlet pipe 22 are provided with a one-way liquid inlet valve 101 .

[0039] More specifically, a one-way air inlet valve 102 is disposed at the lower end of the heating pipe 23 and the steam inlet pipe 24 .

[0040] When the temperature of the raw materials needs to be lowered, the steam in the heating tube 23 is emptied through the one-way air inlet valve 102 provided at the lower end of the heating tube 23 and the steam inlet pipe 24, and then cold water is input into the insulation sleeve through the one-way liquid inlet valve 101 provided on the water inlet pipe 21 and the water outlet pipe 22 for cooling. After the cooling work is completed, the cold water is discharged through the water outlet pipe 22. This design ensures that steam and cold water will not mix in the same heat exchange tube, thereby avoiding potential problems caused by medium mixing, such as unstable temperature control, equipment damage, etc. At the same time, it also enables the preheater to respond to different production needs more flexibly, and can heat the raw materials through steam and adjust the temperature of the raw materials through cold water.

[0041] The working principle of the double-effect feed preheater of the MTBE device in the present invention is:

[0042] Before preheating, raw materials are first added from the feed pipe 11 above the tank body 1. The raw materials will pass through the first filter component 6 and the second filter component 7 to fill the lower part of the tank body 1. By pushing the component 5 to cooperate with the filtering effect of the conical filter 62 and the annular filter 72, the solid impurities in the raw materials during feeding will only exist in the space formed by the conical filter 62 and the annular filter 72, and will not enter the inner tube 3, ensuring that there will be no solid impurities inside the inner tube 3 and the bottom of the tank body 1, so that there will be no solid impurities in the material finally discharged from the discharge pipe 12, ensuring the normal operation of the device and the quality of the MTBE product. During preheating, the steam used for heating enters from the steam inlet pipe 24 and blows the fan blades 43 in the sealing box 41, so that the reciprocating screw 42 rotates. During the rotation of the reciprocating screw 42, the sleeve 51 will move up and down, wherein the partition plate 10 is provided to prevent solid impurities from adhering to the reciprocating threads on the reciprocating screw 42, affecting the normal operation of the equipment, and the opening on the partition plate 10 can also limit the connecting rod 52.

[0043] In the process of the sleeve 51 moving up and down, the connecting rods 52 arranged on both sides of the sleeve 51 will drive the annular plate 8 to move up and down. When the annular plate 8 moves upward, it will touch the first ring 61 on the first filter assembly 6, so that it will move slightly upward through the sliding fit of the first annular groove 63 and the top of the inner cylinder 3, driving the conical filter 62 to move together. After the annular plate 8 descends, under the action of the first spring 64, the first ring 61 moves downward again, so that the first filter assembly 6 produces a shaking effect as a whole, thereby preventing the solid impurities on the top of the conical filter 62 from being blocked. The filter holes on the conical filter 62 affect the circulation of the raw materials; when the annular plate 8 moves downward, it will touch the second ring 71 on the second filter assembly 7, causing it to move slightly downward through the sliding fit of the second annular groove 73 and the bottom of the inner cylinder 3, driving the annular filter 72 to move together. After the annular plate 8 rises, under the action of the second spring 74, the second ring 71 moves upward again, causing the second filter assembly 7 to vibrate as a whole, preventing the solid impurities on the upper part of the annular filter 72 from clogging the filter holes on the annular filter 72 and affecting the circulation of the raw materials. At the same time, due to the sliding fit of the chute 75 and the connecting block 31, the second ring 71 will not separate from the bottom of the inner cylinder 3.

[0044] And the opening and closing assembly 9 on the annular plate 8 can work together with the annular plate 8. When the annular plate 8 descends, the rotating plate 91 on the opening and closing assembly 9 will close to block the opening. When the annular plate 8 rises, the rotating plate 91 will open downward and limit the rotation angle of the rotating plate 91 within ninety degrees through the limit block 92, allowing the raw materials and solid impurities to flow. The up and down movement of the annular plate 8 promotes the raw materials in the tank body 1, so that the raw materials can circulate inside and outside the inner cylinder 3, so that the raw materials are heated more evenly during the preheating process. In addition, the raw materials are continuously circulated, so that the solid impurities inside them will only exist in the space formed by the conical filter screen 62 and the annular filter screen 72, and will not enter the inner cylinder 3, so that there will be no solid impurities in the material finally discharged from the bottom of the tank body 1.

[0045] When the temperature of the raw materials needs to be lowered, the steam in the heating tube 23 is emptied through the one-way air inlet valve 102 provided at the lower end of the heating tube 23 and the steam inlet pipe 24, and then cold water is input into the insulation sleeve through the one-way liquid inlet valve 101 provided on the water inlet pipe 21 and the water outlet pipe 22 for cooling. After the cooling work is completed, the cold water is discharged through the water outlet pipe 22. This design ensures that steam and cold water will not mix in the same heat exchange tube, thereby avoiding potential problems caused by medium mixing, such as unstable temperature control, equipment damage, etc. At the same time, it also enables the preheater to respond to different production needs more flexibly, and can heat the raw materials through steam and adjust the temperature of the raw materials through cold water.

[0046] After preheating is completed, the material is discharged through the discharge pipe 12 at the bottom of the tank body 1. For the convenience of maintenance, an entrance for maintenance can be set on the insulation shell 2 and the tank body 1. When the equipment needs to be cleaned, the switch door on the entrance is opened to flush the inside of the tank body 1 to remove solid impurities on the conical filter 62 and the annular filter 72. At the same time, the heating pipe 23 in the insulation shell 2 can also be inspected and maintained to ensure that the heating pipe 23 can perform preheating work normally.

[0047] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A double-effect feed preheater for an MTBE device, comprising a tank body (1), characterized in that: A heat-insulating shell (2) is fixedly mounted on the lower part of the tank body (1), a partition plate (10) is fixedly mounted on the middle part of the tank body (1), an inner cylinder (3) is arranged below the partition plate (10), a transmission assembly (4) is arranged on the top of the tank body (1), the transmission assembly (4) comprises a sealing box (41) fixedly connected to the top of the tank body (1) and a reciprocating screw (42) rotatably connected to the top of the tank body (1), a reciprocating thread is provided on the outer wall of the reciprocating screw (42), the reciprocating screw (42) passes through the middle part of the sealing box (41), a plurality of fan blades (43) are fixedly mounted on the top of the reciprocating screw (42), and the lower end of the reciprocating screw (42) is connected to the partition plate ( 10) is rotatably connected, the upper part of the tank body (1) is connected to a feed pipe (11), and one end of the feed pipe (11) passes through the partition plate (10), the bottom of the tank body (1) is connected to a discharge pipe (12), a heating pipe (23) is spirally wound inside the insulation shell (2), the upper end of the heating pipe (23) passes through the insulation shell (2) and the tank body (1) in sequence and extends into the sealing box (41), the lower end of the heating pipe (23) passes through the insulation shell (2) and is provided with a steam outlet, the side of the sealing box (41) away from the upper end of the heating pipe (23) is connected to a steam inlet pipe (24), one end of the steam inlet pipe (24) passes through the tank body (1) and is connected to an external steam source; A first filter assembly (6) is arranged at the top of the inner cylinder (3), a second filter assembly (7) is arranged at the bottom of the inner cylinder (3), an annular plate (8) is slidably arranged on the inner cylinder (3), a plurality of openings are evenly opened on the annular plate (8), each of the openings is provided with an opening and closing assembly (9) capable of closing the opening, and a pushing assembly (5) for pushing the annular plate (8) is arranged on the reciprocating screw (42); The first filter assembly (6) comprises a first sleeve (61) and a conical filter screen (62); a first annular groove (63) is provided at the bottom of the first sleeve (61); a plurality of first springs (64) are provided in the first annular groove (63); the first sleeve (61) is slidably connected to the top of the inner cylinder (3) via the first annular groove (63); and the conical filter screen (62) is fixedly mounted on the top of the first sleeve (61); The second filter assembly (7) comprises a second sleeve (71) and an annular filter screen (72). A second annular groove (73) is provided on the upper part of the second sleeve (71). A plurality of second springs (74) are arranged in the second annular groove (73). The second sleeve (71) is slidably connected to the bottom of the inner cylinder (3) through the second annular groove (73). The annular filter screen (72) is fixedly mounted on the outer side of the second sleeve (71), and the outer wall of the annular filter screen (72) is in contact with the inner wall of the tank body (1). Connecting blocks (31) are fixedly mounted on both sides of the lower part of the inner cylinder (3). The ends of the two connecting blocks (31) that are away from each other are fixedly connected to the inner wall of the tank body (1). Slide grooves (75) are provided on both sides of the second sleeve (71), and each of the slide grooves (75) is slidably matched with the corresponding connecting block (31). The opening and closing assembly (9) comprises two rotating plates (91) and two limiting blocks (92), wherein the two limiting blocks (92) are respectively fixedly mounted on two sides of the through opening, and the two rotating plates (91) are respectively rotatably connected to the two limiting blocks (92); The pushing assembly (5) comprises a sleeve (51) and two connecting rods (52), wherein the sleeve (51) is threadedly connected to the reciprocating screw (42), one end of the two connecting rods (52) is fixedly connected to the sleeve (51), and the other end of the two connecting rods (52) is fixedly connected to the annular plate (8), and the partition plate (10) is provided with an opening for accommodating the two connecting rods (52).

2. The MTBE device double-effect feed preheater according to claim 1, characterized in that: The top of the heat-insulating shell (2) is connected to a water inlet pipe (21), and the bottom of the heat-insulating shell (2) is connected to a water outlet pipe (22). Both the water inlet pipe (21) and the water outlet pipe (22) are provided with a one-way liquid inlet valve (101).

3. The MTBE device double-effect feed preheater according to claim 1, characterized in that: A one-way air inlet valve (102) is provided at the lower end of the heating pipe (23) and on the steam inlet pipe (24).

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