Method for discharging polymer and wax in low-pressure separator of high-pressure polyethylene device

Abstract

The invention relates to the technical field of discharging polymers and oil wax in a low-pressure separator of a high-pressure polyethylene device, in particular to a method for discharging polymers and oil wax in the low-pressure separator of the high-pressure polyethylene device, and the low-pressure separator comprises a main tank body, and a liquid inlet and an exhaust port which are fixedly mounted on the main tank body; a flaring channel is fixedly mounted in the main tank body; a bracket is fixedly mounted on the main tank body; the sensing mechanism is arranged in the main tank body; a conical tank body is fixedly mounted on the main tank body; the end face conduction structure is connected with the conical tank body and the liquid outlet; the conduction area of the conical tank body and the liquid outlet is increased through the end face conduction structure, so that the flowing-out speed of the polymer is increased, part of the adhered polymer and oil wax are taken away through the polymer, the normal operation time of the device is prolonged due to adhesion of the polymer and the oil wax, the production efficiency can be effectively improved, and the production cost is reduced. And the maintenance frequency of the device is obviously reduced.

Description

Technical Field

[0001] The invention relates to the technical field of discharging polymers and oil wax in a low-pressure separator of a high-pressure polyethylene device, in particular to a method for discharging polymers and oil wax in a low-pressure separator of a high-pressure polyethylene device. Background Art

[0002] High-pressure polyethylene devices mainly use ethylene monomers to produce polyethylene through free radical polymerization under high pressure and high temperature conditions. This process is usually carried out at a temperature of 150-290°C and a pressure of 147.1-245.2MPa, using trace oxygen or organic peroxides as initiators. Due to the high reaction temperature, it is easy to transfer the reaction to the macromolecular chain, resulting in the product having more long and short branches, forming low-density polyethylene. This material is widely used in many application fields due to its low density and good flexibility and processing properties.

[0003] During the production process of high-pressure polyethylene equipment, materials often stick to the wall of the pipeline and equipment. Especially in the low-pressure circulating gas separator in the actual production process, polymers and oil wax cannot be discharged normally. The longer the time, the more they accumulate. When the liquid level of the low-pressure product separator is too high, polymers and oil wax will be brought into the low-circulation system and the compressor inlet separation tank. Polymers and oil wax will cause the bottom of the booster inlet separation tank to be unable to drain oil wax normally, causing the device to stop. After stopping, the polymers and oil wax in the low-pressure circulating gas separator need to be cleaned up. The common cleaning method is high-pressure water gun flushing.

[0004] When flushing with a high-pressure water gun, the low-pressure separator must be disassembled first, and then each position in the separator must be thoroughly flushed with a high-pressure water gun, and then assembly and debugging are performed. The whole process is relatively cumbersome; and because the adhesion of polymers and oil waxes is irregular (it may form a blockage in a short period of time, or it may take a long time to form a blockage), if blockage occurs frequently, it needs to be cleaned frequently, which has a serious impact on the production capacity of the device and the operation of the equipment. Summary of the invention

[0005] The object of the present invention is to provide a method for discharging polymers and oil wax from a low-pressure separator of a high-pressure polyethylene device, so as to solve the problems raised in the above-mentioned background technology.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] The method for discharging polymer and oil wax from a low-pressure separator of a high-pressure polyethylene device comprises the following steps:

[0008] Step 1: After the high-pressure polyethylene unit is in operation, the polymer in the molten state will enter the low-pressure separator along with the oil wax, catalyst and incompletely reacted gaseous ethylene for separation;

[0009] Step 2: The separated gaseous ethylene will be pumped to the primary compressor for subsequent production use, and the polymer, oil wax and catalyst will be discharged from the discharge end;

[0010] Step 3: The inner wall of the low-pressure separator is coated with Teflon coating, which can effectively reduce the adhesion of polymer, oil wax and the inner wall of the low-pressure separator, but a small amount of polymer and oil wax will still adhere to the low-pressure separator;

[0011] Step 4: The polymer and oil wax adhering to the low-pressure separator will reduce the conduction area at the discharge end, making the flow rate of the polymer lower, thereby increasing the liquid level in the low-pressure separator. At this time, the sensing mechanism in the low-pressure separator will sense and send a control signal to the end surface conduction structure at the discharge end;

[0012] Step 5: The end face conduction structure will increase the conduction area of ​​the discharge end according to the control signal, so as to increase the flow rate of the polymer and reduce the retention of the polymer and oil wax.

[0013] As a further solution of the present invention: the low-pressure separator comprises:

[0014] A main tank body, and a liquid inlet and an exhaust port fixedly mounted on the main tank body; a flaring channel connected to the liquid inlet is fixedly mounted in the main tank body; a bracket is fixedly mounted on the main tank body;

[0015] The sensing mechanism is disposed in the main tank;

[0016] A conical tank body is fixedly mounted on one end of the main tank body away from the liquid inlet;

[0017] One end of the end surface conducting structure is connected to the conical tank body, and the other end thereof is connected to a liquid discharge port.

[0018] As a further solution of the present invention: the Teflon coating is applied on the inner wall of the conical tank body.

[0019] As a further solution of the present invention: the sensing mechanism comprises a connecting rod rotatably mounted on the inner wall of the main tank body, and a floating ball is fixedly mounted on one end of the connecting rod away from the inner wall of the main tank body.

[0020] As a further solution of the present invention: the end face conductive structure includes two connecting rings, one of which is fixedly connected to the conical tank body; the other connecting ring is fixedly connected to the discharge port, and the connecting ring connected to the conical tank body is provided with a mounting groove, in which a plurality of groups of tightly fitting conductive plates are rotatably installed; a protruding column is fixedly installed on the conductive plate; the two connecting rings are fixedly connected by an arc-shaped protrusion; a control ring is also rotatably installed between the two connecting rings, the control ring is provided with a rotating groove slidably engaged with the arc-shaped protrusion, and the control ring is fixedly provided with a sliding groove slidably engaged with the protruding column.

[0021] As a further solution of the present invention: a plurality of the conduction plates are distributed along the circumference of the installation slot, and two adjacent conduction plates are installed with an upper and lower offset, and two adjacent conduction plates are tightly fitted.

[0022] As a further solution of the present invention: the chute is arranged inclined.

[0023] As a further solution of the present invention: the end face conduction structure also includes a motor fixedly mounted on the bracket, a rotating shaft is fixedly connected to the output end of the motor, a gear is fixedly mounted on the rotating shaft, and an annular rack meshing with the gear is fixedly mounted on the outer periphery of the control ring.

[0024] Compared with the prior art, the beneficial effects of the present invention are as follows: the adhesion of polymer and oil wax is reduced by a conical tank body with a Teflon coating (it can only be reduced but not eliminated), thereby increasing the time during which the conduction area between the conical tank body and the discharge port is reduced due to the adhesion of polymer and oil wax to the point where it affects the normal operation of the device, which can effectively increase production efficiency and significantly reduce the frequency of device maintenance; as time accumulates, when the conduction area between the conical tank body and the discharge port is reduced due to the adhesion of polymer and oil wax (the balance between the outflow and inflow is broken, and the liquid level height will gradually rise), the liquid level height in the conical tank body and the main tank body is sensed in real time by a sensing mechanism, and the conduction distance between the conical tank body and the discharge port is increased by an end face conduction structure. The flow area is increased to increase the outflow (the outflow is greater than the inflow), thereby accelerating the outflow speed of the polymer in the main tank and the conical tank, and taking away some sticky polymer and oil wax through the flowing polymer, thereby further increasing the time when the conduction area between the conical tank and the drain port is reduced due to the adhesion of polymer and oil wax to affect the normal operation of the device, which can effectively increase production efficiency and significantly reduce the frequency of device maintenance; effectively avoid oil wax from entering the inlet of the booster compressor, and the product crystal point index is qualified; after the replacement, the high-pressure polyethylene device effectively reduces the problem of blockage of the low-pressure circulating gas system and the bottom pipeline of the separation tank of the booster inlet due to oil wax accumulation, and the booster compressor and the low-pressure circulating gas system operate normally. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 The present invention is a schematic structural diagram of an embodiment of a low-pressure separator in a method for discharging polymers and oil wax from a low-pressure separator of a high-pressure polyethylene device.

[0026] Figure 2 for Figure 1 Schematic diagram of the structure from a cross-sectional perspective.

[0027] Figure 3 for Figure 2 Schematic diagram of the structure at A in the middle.

[0028] Figure 4 A schematic structural diagram of a conical tank body in an embodiment of a low-pressure separator in a method for discharging polymers and oil wax from a low-pressure separator of a high-pressure polyethylene device.

[0029] Figure 5 The present invention is a schematic structural diagram of an end face conduction structure in an embodiment of a low-pressure separator in a method for discharging polymers and oil wax in a low-pressure separator of a high-pressure polyethylene device.

[0030] Figure 6 for Figure 5 Schematic diagram of the structure from an exploded perspective.

[0031] Figure 7 for Figure 5 Schematic diagram of the structure from a cross-sectional perspective.

[0032] Figure 8 for Figure 7 Schematic diagram of the structure at B in the figure.

[0033] In the figure: 1, main tank body; 101, liquid inlet; 102, expansion channel; 103, exhaust port; 104, bracket;

[0034] 2. Conical tank body;

[0035] 3. Drainage port;

[0036] 4. Connecting ring; 401. Mounting groove; 402. Arc-shaped protrusion;

[0037] 5. control ring; 501. annular rack; 502. rotating groove; 503. sliding groove;

[0038] 6. Conductive plate; 601. Protruding column;

[0039] 7. Motor;

[0040] 8. Rotating shaft;

[0041] 9. Gears;

[0042] 10. Float;

[0043] 11. Connecting rod. DETAILED DESCRIPTION

[0044] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0045] In addition, when an element in the present invention is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only embodiment.

[0046] See also Figures 1 to 8 In an embodiment of the present invention, a method for discharging polymer and oil wax from a low-pressure separator of a high-pressure polyethylene device comprises the following steps:

[0047] Step 1: After the high-pressure polyethylene unit is in operation, the polymer in the molten state will enter the low-pressure separator along with the oil wax, catalyst and incompletely reacted gaseous ethylene for separation;

[0048] Step 2: The separated gaseous ethylene will be pumped to the primary compressor for subsequent production use, and the polymer, oil wax and catalyst will be discharged from the discharge end;

[0049] Step 3: The inner wall of the low-pressure separator is coated with Teflon coating, which can effectively reduce the adhesion of polymer, oil wax and the inner wall of the low-pressure separator, but a small amount of polymer and oil wax will still adhere to the low-pressure separator;

[0050] Step 4: The polymer and oil wax adhering to the low-pressure separator will reduce the conduction area at the discharge end, making the flow rate of the polymer lower, thereby increasing the liquid level in the low-pressure separator. At this time, the sensing mechanism in the low-pressure separator will sense and send a control signal to the end surface conduction structure at the discharge end;

[0051] Step 5: The end face conduction structure will increase the conduction area of ​​the discharge end according to the control signal, so as to increase the flow rate of the polymer and reduce the retention of the polymer and oil wax.

[0052] In another embodiment of the present invention, the low-pressure separator comprises:

[0053] A main tank body 1, and a liquid inlet 101 and an exhaust port 103 fixedly mounted on the main tank body 1; a flared channel 102 connected to the liquid inlet 101 is fixedly mounted in the main tank body 1; a bracket 104 is fixedly mounted on the main tank body 1;

[0054] The sensing mechanism is arranged in the main tank body 1;

[0055] A conical tank body 2 is fixedly mounted on one end of the main tank body 1 away from the liquid inlet 101;

[0056] One end of the end surface conductive structure is connected to the conical tank body 2 , and the other end thereof is connected to a liquid discharge port 3 .

[0057] Taking the embodiment combining all the features described in the present application as an example, when in use, the liquid inlet 101 is connected to the high-pressure separator in the high-pressure polyethylene device; the molten polymer in the high-pressure separation enters the main tank body 1 from the liquid inlet 101 along with the oil wax and catalyst and the incompletely reacted gaseous ethylene, and the expansion channel 102 can accelerate the pressure release of the molten polymer.

[0058] The main tank 1 is in a relatively low-pressure environment. After the molten polymer enters, the pressure will be released. At this time, the incompletely reacted gaseous ethylene will be separated from the molten polymer and pumped from the exhaust port 103 to the primary compressor for subsequent production use.

[0059] When the liquid level of the molten polymer in the main tank body 1 and the conical tank body 2 rises to the set position, it is discharged from the discharge port 3. At this time, the inflow and outflow in the main tank body 1 and the conical tank body 2 are kept in relative balance (through the balance state, a certain reaction time is reserved for the polymer and unreacted ethylene in the main tank body 1 and the conical tank body 2 to avoid the ethylene being discharged together with the polymer without being completely separated), so that the liquid level height remains relatively stable.

[0060] As time goes by, some polymer and oil wax will stick to the main tank body 1 and the conical tank body 2. The sticky polymer and oil wax will reduce the conduction area between the conical tank body 2 and the discharge port 3, making the flow rate of the polymer lower and causing the balance between the inflow and outflow to be broken (the inflow is greater than the outflow), causing the liquid level to gradually rise. At this time, the sensing mechanism will sense and send a real-time signal to the end surface conduction structure.

[0061] The end face conductive structure that receives the signal will respond by increasing the conductive area between the conical tank body 2 and the discharge port 3 to increase the outflow, and take away some sticky polymer and oil wax through the flowing polymer. At this time, the outflow will be greater than the inflow, and the liquid level will decrease. The sensing mechanism will synchronously send a signal to the end face conductive structure to reduce the outflow by reducing the conductive area, so that the outflow and inflow remain relatively balanced.

[0062] In another embodiment of the present invention, the Teflon coating is applied on the inner wall of the conical tank body 2 .

[0063] Taking the embodiment combining all the features recorded in this application as an example, when in use, the Teflon material has the characteristics of unique heat resistance, low friction coefficient, good lubricity, and non-adhesion to substances, etc., which can effectively reduce the adhesion of polymers and oil wax to the conical tank body 2 (it can only be reduced but not eliminated), thereby increasing the time during which the conduction area between the conical tank body 2 and the discharge end is reduced due to the adhesion of polymers and oil wax to affect the normal operation of the device, which can effectively increase production efficiency and significantly reduce the frequency of device maintenance.

[0064] In another embodiment of the present invention, the sensing mechanism comprises a connecting rod 11 rotatably mounted on the inner wall of the main tank body 1 , and a floating ball 10 is fixedly mounted on one end of the connecting rod 11 away from the inner wall of the main tank body 1 .

[0065] Taking the embodiment combining all the features recorded in this application as an example, when in use, the float 10 is a sealed hollow sphere that can rise or fall with the change of the liquid level height in the conical tank body 2 and the main tank body 1; the position sensor on the main tank body 1 will sense the position of the float 10 in real time.

[0066] When the liquid level rises, the float 10 also rises synchronously. At this time, the float 10 will drive the connecting rod 11 to rotate. At this time, the sensor will send a control signal to the end surface control structure, so that the conduction area between the conical tank body 2 and the discharge port 3 is increased.

[0067] In another embodiment of the present invention, the end face conduction structure includes two connecting rings 4, one of the connecting rings 4 is fixedly connected to the conical tank body 2; the other connecting ring 4 is fixedly connected to the discharge port 3, and the connecting ring 4 connected to the conical tank body 2 is provided with a mounting groove 401, and a plurality of groups of tightly fitting conduction plates 6 are rotatably installed in the mounting groove 401; a protruding column 601 is fixedly installed on the conduction plate 6; the two connecting rings 4 are fixedly connected by an arc-shaped protrusion 402; a control ring 5 is also rotatably installed between the two connecting rings 4, and the control ring 5 is provided with a rotating groove 502 that is slidably engaged with the arc-shaped protrusion 402, and a sliding groove 503 that is slidably engaged with the protruding column 601 is fixedly installed on the control ring 5.

[0068] Taking the embodiment combining all the features described in this application as an example, when in use, in the initial state, the close distribution of the plurality of conduction plates 6 minimizes the conduction area between the conical tank body 2 and the discharge port 3, so that the inflow and outflow can be relatively balanced. The control ring 5 and the two connecting rings 4 are in a sealed state (liquid polymer will not flow out of the connection seam between the control ring 5 and the connecting ring 4).

[0069] When the control ring 5 rotates forward, the arc-shaped protrusion 402 will slide with the rotating groove 502, thereby changing the position of the slide groove 503 (the amount of change is related to the rotation angle of the control ring 5), and the synchronous protruding column 601 will slide with the slide groove 503, and the inner wall of the slide groove 503 will give the protruding column 601 a thrust, which will cause the conduction plate 6 to rotate into the installation groove 401 along the rotating connection with the connecting ring 4; multiple groups of conduction plates 6 rotate synchronously, so that the area of ​​the conduction plate 6 located in the connecting ring 4 is synchronously reduced, thereby increasing the conduction area between the conical tank body 2 and the discharge port 3.

[0070] By increasing the conduction area between the conical tank body 2 and the discharge port 3, the outflow is increased, and part of the sticky polymer and oil wax are taken away by the flowing polymer. At this time, the outflow will be greater than the inflow, the liquid level will be reduced, and the sensing mechanism will synchronously send a signal to the end face conduction structure to reduce the outflow by reducing the conduction area, so that the outflow and flow rate remain relatively balanced.

[0071] In another embodiment of the present invention, the plurality of conducting plates 6 are distributed along the circumference of the installation slot 401 , and two adjacent conducting plates 6 are installed with an up-down offset, and the two adjacent conducting plates 6 are tightly fitted.

[0072] Taking the embodiment combining all the features recorded in the present application as an example, when in use, the two adjacent conduction plates 6 are installed in an offset manner up and down, which can reduce the difficulty of rotating the conduction plates 6, so that when the control ring 5 is rotated, the conduction plates 6 can be driven to rotate synchronously; the tight fit between the conduction plates 6 can effectively prevent the molten polymer from flowing out of the gaps between the conduction plates 6, thereby reducing the difficulty of the conduction plates 6 controlling the conduction area (if the molten polymer flows out of the gaps, the conduction area is changed by changing the position of the conduction plates 6, thereby increasing the difficulty of controlling the inflow and outflow to be in a balanced state).

[0073] In another embodiment of the present invention, the slide groove 503 is arranged to be inclined.

[0074] Taking the embodiment combining all the features described in the present application as an example, when in use, the slide groove 503 is tilted and tangent to the rotation trajectory of the protruding column 601. At this time, the slide groove 503 is driven to rotate by rotating the control ring 5, and the inner wall of the slide groove 503 gives the protruding column 601 a thrust that can drive the conductive plate 6 to rotate.

[0075] In another embodiment of the present invention, the end face conductive structure further comprises a motor 7 fixedly mounted on the bracket 104, a rotating shaft 8 is fixedly connected to the output end of the motor 7, a gear 9 is fixedly mounted on the rotating shaft 8, and an annular rack 501 meshing with the gear 9 is fixedly mounted on the outer periphery of the control ring 5.

[0076] Taking the embodiment combining all the features recorded in the present application as an example, when in use, the motor 7 works upon receiving the control signal from the sensing mechanism, drives the gear 9 to rotate through the rotating shaft 8, and drives the annular rack 501 to rotate through the meshing action, thereby driving the control ring 5 to rotate; by rotating the control ring 5, the conduction plate 6 is driven to rotate, causing the conduction area between the conical tank body 2 and the discharge port 3 to change, thereby maintaining a relative balance between the inflow and outflow.

[0077] The adhesion of polymer and oil wax is reduced by a conical tank body 2 with a Teflon coating (it can only be reduced but not eliminated), thereby increasing the time during which the conduction area between the conical tank body 2 and the discharge port 3 is reduced due to the adhesion of polymer and oil wax to the point where it affects the normal operation of the device, which can effectively increase production efficiency and significantly reduce the frequency of device maintenance. As time accumulates, when the conduction area between the conical tank body 2 and the discharge port 3 is reduced due to the adhesion of polymer and oil wax (the balance between the outflow and inflow is broken, and the liquid level will gradually rise), the liquid level in the conical tank body 2 and the main tank body 1 is sensed in real time by a sensing mechanism, and the conduction area between the conical tank body 2 and the discharge port 3 is increased by an end face conduction structure, so that the flow The outflow rate increases (the outflow rate is greater than the inflow rate), thereby accelerating the outflow rate of the polymer in the main tank body 1 and the conical tank body 2, and taking away some sticky polymer and oil wax through the flowing polymer, thereby further increasing the time during which the conduction area between the conical tank body 2 and the discharge port 3 is reduced due to the adhesion of polymer and oil wax to affect the normal operation of the device, which can effectively increase production efficiency and significantly reduce the frequency of device maintenance; effectively avoid oil wax from entering the inlet of the booster compressor, and the product crystal point index is qualified; after the replacement, the high-pressure polyethylene device effectively reduces the problem of blockage of the low-pressure circulating gas system and the bottom pipeline of the separation tank at the inlet of the booster compressor due to oil wax accumulation, and the booster compressor and the low-pressure circulating gas system operate normally.

[0078] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

[0079] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A method for discharging polymers and oil wax from a low-pressure separator of a high-pressure polyethylene device, characterized in that: The following steps are involved: Step 1: After the high-pressure polyethylene unit is in operation, the polymer in the molten state will enter the low-pressure separator along with the oil wax, catalyst and incompletely reacted gaseous ethylene for separation; Step 2: The separated gaseous ethylene will be pumped to the primary compressor for subsequent production use, and the polymer, oil wax and catalyst will be discharged from the discharge end; Step 3: The inner wall of the low-pressure separator is coated with Teflon coating, which can effectively reduce the adhesion of polymer, oil wax and the inner wall of the low-pressure separator, but a small amount of polymer and oil wax will still adhere to the low-pressure separator; Step 4: The polymer and oil wax adhering to the low-pressure separator will reduce the conduction area at the discharge end, reduce the flow rate of the polymer, and thus increase the liquid level in the low-pressure separator. At this time, the sensing mechanism in the low-pressure separator will sense and send a control signal to the end surface conduction structure at the discharge end; Step 5: The end face conduction structure will increase the conduction area of ​​the discharge end according to the control signal, so as to increase the flow rate of the polymer and reduce the retention of the polymer and oil wax.

2. The method for discharging polymers and oil wax from a low-pressure separator of a high-pressure polyethylene device according to claim 1, characterized in that: The low pressure separator comprises: A main tank body (1), and a liquid inlet (101) and an exhaust port (103) fixedly mounted on the main tank body (1); a flared channel (102) in communication with the liquid inlet (101) is fixedly mounted in the main tank body (1); and a bracket (104) is fixedly mounted on the main tank body (1); The sensing mechanism is arranged in the main tank (1); A conical tank body (2) is fixedly mounted on one end of the main tank body (1) away from the liquid inlet (101); One end of the end surface conductive structure is connected to the conical tank body (2), and the other end thereof is connected to a liquid discharge port (3).

3. The method for discharging polymers and oil wax from a low-pressure separator of a high-pressure polyethylene device according to claim 2, characterized in that: The Teflon coating is applied on the inner wall of the conical tank body (2).

4. The method for discharging polymers and oil wax from a low-pressure separator of a high-pressure polyethylene device according to claim 2, characterized in that: The sensing mechanism comprises a connecting rod (11) rotatably mounted on the inner wall of the main tank body (1), and a floating ball (10) is fixedly mounted on one end of the connecting rod (11) away from the inner wall of the main tank body (1).

5. The method for discharging polymers and oil wax from a low-pressure separator of a high-pressure polyethylene device according to claim 2, characterized in that: The end face conduction structure comprises two connecting rings (4), one of which is fixedly connected to the conical tank body (2); the other connecting ring (4) is fixedly connected to the discharge port (3); the connecting ring (4) connected to the conical tank body (2) is provided with a mounting groove (401), and a plurality of groups of tightly fitting conduction plates (6) are rotatably mounted in the mounting groove (401); a protruding column (601) is fixedly mounted on the conduction plate (6); the two connecting rings (4) are fixedly connected via an arc-shaped protrusion (402); a control ring (5) is also rotatably mounted between the two connecting rings (4), the control ring (5) is provided with a rotating groove (502) slidably engaged with the arc-shaped protrusion (402), and a sliding groove (503) slidably engaged with the protruding column (601) is fixedly mounted on the control ring (5).

6. The method for discharging polymers and oil wax from a low-pressure separator of a high-pressure polyethylene device according to claim 5, characterized in that: The plurality of conducting plates (6) are distributed along the circumference of the installation groove (401), and two adjacent conducting plates (6) are installed in an up-down staggered manner, and the two adjacent conducting plates (6) are tightly fitted.

7. The method for discharging polymers and oil wax from a low-pressure separator of a high-pressure polyethylene device according to claim 5, characterized in that: The slide groove (503) is arranged obliquely.

8. The method for discharging polymers and oil wax from a low-pressure separator of a high-pressure polyethylene device according to claim 5, characterized in that: The end face conduction structure also includes a motor (7) fixedly mounted on the bracket (104); a rotating shaft (8) is fixedly connected to the output end of the motor (7); a gear (9) is fixedly mounted on the rotating shaft (8); and an annular rack (501) meshing with the gear (9) is fixedly mounted on the outer periphery of the control ring (5).

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