Waste gas treatment equipment for ultra-high molecular weight polyethylene production

Abstract

The invention discloses waste gas treatment equipment for ultra-high molecular weight polyethylene production, and particularly relates to the technical field of waste gas treatment.The waste gas treatment equipment comprises a waste gas treatment tower, a drying filter, a heat exchanger, RTO equipment, a chimney and an activated carbon adsorption box which are sequentially arranged in the waste gas treatment flow direction, and the waste gas treatment tower comprises a mixing section and a spraying section fixed to the top end of the mixing section; the lower space in the mixing section is sequentially divided into a waste gas cavity, a treatment cavity and a liquid cavity by two partition plates, a plurality of mixing pipes are fixed in the treatment cavity and are used for carrying out continuous multi-treatment on waste gas, and a gas inlet assembly and a driving assembly are arranged on one side of the mixing section and are used for fully treating the waste gas when the gas inflow in the waste gas treatment tower is increased. Efficient treatment of waste gas during production of ultra-high molecular weight polyethylene is achieved, the service life of equipment can be effectively prolonged, and it can be guaranteed that the waste gas meets the environment-friendly emission requirement.

Description

Technical Field

[0001] This invention relates to the field of waste gas treatment technology, specifically to waste gas treatment equipment used in the production of ultra-high molecular weight polyethylene. Background Technology

[0002] Ultra-high molecular weight polyethylene (UHMWPE) is linear polyethylene with a molecular weight of over 1.5 million. The industrial production of UHMWPE generates a large amount of waste gas. This waste gas has a complex composition and contains a variety of pollutants, including acidic gases such as hydrogen chloride, sulfur oxides, and nitrogen oxides, as well as volatile organic compounds (VOCs) such as alkanes and olefins. This type of waste gas requires a combined process of deacidification pretreatment and VOCs incineration to meet environmental emission requirements. The adequacy of the deacidification pretreatment directly determines the operational stability and treatment efficiency of the subsequent RTO (Regenerative Thermal Oxidizer) system.

[0003] In actual industrial production scenarios, it is extremely common for the volume of exhaust gas to increase in stages due to factors such as adjustments to upstream production processes, equipment start-up and shutdown operations, and load regulation. However, when the volume of exhaust gas increases, the residence time of the exhaust gas in the existing ultra-high molecular weight polyethylene exhaust gas deacidification treatment tower is significantly reduced, resulting in insufficient contact and reaction with the alkaline solution. Consequently, the removal rate of acidic gases such as hydrogen chloride and sulfur oxides decreases significantly, and some of the unremoved acidic substances will enter subsequent treatment units with the exhaust gas flow.

[0004] If such incompletely desulfurized waste gas enters the RTO system directly, it will cause a series of damages to the equipment, such as corrosion of the RTO equipment, reduced heat exchange efficiency and heat storage effect of the RTO system, and incomplete VOCs incineration and decomposition. These problems will not only lead to decreased operational stability and increased energy consumption of the RTO system, but also result in non-compliance of waste gas emissions, causing harm to the environment. Summary of the Invention

[0005] The purpose of this invention is to provide waste gas treatment equipment for the production of ultra-high molecular weight polyethylene (UHMWPE), which can efficiently treat the waste gas produced during UHMWPE production, effectively extending the service life of the equipment and ensuring that the waste gas meets environmental emission requirements.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a waste gas treatment device for ultra-high molecular weight polyethylene production, comprising a waste gas treatment tower, a drying filter, a heat exchanger, an RTO device, a chimney, and an activated carbon adsorption box arranged sequentially along the waste gas treatment flow direction, with each unit connected by a sealed pipeline to ensure no waste gas leakage.

[0007] The exhaust gas treatment tower includes a mixing section and a spray section fixed at the top of the mixing section. The space below the mixing section is divided into an exhaust gas chamber, a treatment chamber and a liquid chamber by two partitions in sequence. Multiple mixing pipes are fixed in the treatment chamber for continuous multi-stage treatment of the exhaust gas. An air intake component and a drive component are provided on one side of the mixing section to fully treat the exhaust gas when the air intake volume in the exhaust gas treatment tower increases.

[0008] Preferably, the mixing tube has a triangular cross-section, and each partition has a through hole that corresponds to and communicates with the mixing tube; multiple air outlets are evenly distributed on both sides of the mixing tube, and a waterproof and breathable membrane is fixed inside the air outlet; multiple liquid drop holes are evenly distributed at the bottom of the mixing tube.

[0009] Preferably, an air inlet channel communicating with the exhaust gas chamber is fixed on one side of the mixing section, and a liquid inlet pipe communicating with the liquid chamber is fixed on the other side of the mixing section. A drain pipe communicating with the treatment chamber is fixed at the bottom of the mixing section. The exhaust gas enters the exhaust gas chamber through the air inlet channel and then enters the mixing pipe. At the same time, the alkaline solution enters the liquid chamber through the liquid inlet pipe and then enters the mixing pipe. The exhaust gas and alkaline solution are mixed in a counter-current manner in the mixing pipe to achieve the first treatment. The treated waste liquid falls through the drop hole, while the treated exhaust gas rises through the air outlet. The alkaline solution remaining in the upper layer of the falling waste liquid mixes again with the lower layer of rising exhaust gas to achieve the second treatment. Finally, the waste liquid is discharged through the drain pipe.

[0010] Preferably, a spray pipe is fixed at the top of the spray section, with one end of the spray pipe extending outside the spray section. Alkali solution enters the spray pipe and sprays downwards onto the waste gas after the second treatment, thus achieving the third treatment of the waste gas. The treated waste gas is discharged through the outlet pipe fixed at the top of the spray section.

[0011] Preferably, the intake assembly includes a housing fixed to the side of the intake channel away from the mixing section. An intake pipe is fixed to the side of the housing away from the intake channel. Two vertically distributed openings are provided on the side of the housing near the intake channel. Exhaust gas enters the exhaust gas chamber along the intake pipe, housing, openings, and intake channel. A piston plate is slidably provided inside the housing, and the outer wall of the piston plate is in contact with the inner wall of the housing. The side of the piston plate near the intake channel is connected to the inner wall of the housing by an elastic telescopic rod. The elastic telescopic rod includes an outer tube and an inner tube disposed inside the outer tube. One end of the inner tube extends out of the outer tube and is fixed to the side of the piston plate near the intake channel. The other end of the inner tube is connected to the inner wall of the outer tube by a spring. A wedge block is fixed to the side of the piston plate near the intake channel by a connecting rod. Both the connecting rod and the wedge block are located at the top of the elastic telescopic rod.

[0012] Preferably, the drive assembly includes a vertical tube fixed to the top of the housing, a movable rod inside the vertical tube, the bottom end of the movable rod extending into the housing, and the inclined surface of the wedge block close to the vertical tube. The top end of the movable rod is connected to the top end of the vertical tube via a spring. Multiple guide sleeves are fixed inside the vertical tube, the guide sleeves are fitted onto the movable rod, and the movable rod is slidably connected to the guide sleeves to guide the movement of the movable rod.

[0013] Preferably, the bottom of the air outlet pipe is provided with an adjusting component 1, which includes a housing 1 fixed to the bottom end of the air outlet pipe and communicating with the interior of the air outlet pipe, and a valve plate 1 is provided inside the housing 1; the top of the end of the spray pipe extending out of the spray section is provided with an adjusting component 2, which includes a housing 2 fixed to the top end of the spray pipe and communicating with the interior of the spray pipe, and a valve plate 2 is provided inside the housing 2, and the valve plate 2 extends into the interior of the spray pipe; a sliding groove is opened on the outer wall of the top of the vertical pipe, and a connecting rod 1 and a connecting rod 2 distributed vertically are fixed on the outer wall of the top of the movable rod, the end of the connecting rod 1 away from the movable rod passes through the sliding groove and the housing 1 and is fixed to the bottom end of the valve plate 1, and the end of the connecting rod 2 away from the movable rod passes through the sliding groove and the housing 2 and is fixed to the top end of the valve plate 2.

[0014] When the air intake inside the casing increases, it pushes the piston plate to move, which in turn drives the wedge block to move and drives the movable rod to move upward. This, in turn, drives the first valve plate to move, thereby slowing down the exhaust gas flow rate in the exhaust pipe. At the same time, it drives the second valve plate to move, thereby increasing the spray volume of the spray pipe for thorough treatment of the exhaust gas.

[0015] Preferably, the end of the piston plate away from the elastic telescopic rod is machined into a pyramidal surface, and multiple holes penetrating both the piston plate and the wedge block are provided to divert the exhaust gas so that the exhaust gas enters the exhaust gas chamber smoothly; a pressure relief pipe is fixed between the bottom of the outer shell and one side of the mixing section. One end of the pressure relief pipe is connected to the side of the piston plate away from the elastic telescopic rod in the inner cavity of the outer shell, and the other end of the pressure relief pipe is connected to the exhaust gas chamber. A pressure relief valve is fixed on the pressure relief pipe.

[0016] Preferably, the dryer filter is located at the output end of the exhaust gas treatment tower to remove moisture and impurities from the exhaust gas; the heat exchanger is located at the output end of the dryer filter, the RTO equipment is located at the output end of the heat exchanger, and the chimney is connected to the output end of the RTO equipment to treat VOCs in the exhaust gas. The treated exhaust gas is discharged through the chimney.

[0017] The activated carbon adsorption box is connected to the output end of the heat exchanger and to the input end of the chimney. When the RTO equipment experiences abnormal operating conditions, the activated carbon adsorption box acts as an emergency device to adsorb VOCs that have not been incinerated. The treated waste gas is then discharged through the chimney.

[0018] Preferably, a jacket is fixed to the outer wall of the spray section. The cooling medium enters the jacket to cool the inside of the waste gas treatment tower, which helps to maintain the stability of the gas pressure inside the waste gas treatment tower. The output end of the jacket is connected to the input end of the heat exchanger. After heating, the cooling medium and the waste gas treated by the dryer filter exchange heat in the heat exchanger to preheat the waste gas entering the RTO equipment and reduce energy consumption. A second pressure relief pipe is fixed to the top outer wall of the spray section. The second pressure relief pipe is located above the spray pipe and a pressure relief valve is fixed on the second pressure relief pipe. The second pressure relief pipe is connected to the input end of the dryer filter.

[0019] The technical effects and advantages provided by the present invention in the above technical solution are as follows: First, the waste gas undergoes multiple continuous counter-current mixing and deacidification treatments within the waste gas treatment tower to achieve efficient deacidification. Second, addressing the common issue of phased increases in waste gas intake volume during ultra-high molecular weight polyethylene production, this invention utilizes a linkage adjustment mechanism between the piston plate of the intake component and the drive component to simultaneously achieve coordinated control of "reducing waste gas flow rate + increasing alkaline spray volume," ensuring that the waste gas can still be adequately deacidified even when the intake volume increases. At the same time, when the exhaust gas passes through the piston plate, the pyramidal surface of the piston plate and the diversion holes opened on it can divert the exhaust gas when it enters the equipment, reduce the airflow impact, so that the exhaust gas enters the equipment smoothly and avoids airflow fluctuations from affecting the treatment effect. Compared with existing technologies, this invention can effectively reduce the risk of corrosion and blockage to subsequent equipment, extend the overall service life of the equipment, and ensure that the treated exhaust gas meets environmental emission requirements. Attached Figure Description

[0020] Figure 1 This is a flowchart illustrating the overall processing of the present invention; Figure 2 This is a structural diagram of the waste gas treatment tower; Figure 3 This is a front sectional view of the waste gas treatment tower; Figure 4 This is a side sectional view of the mixed section; Figure 5 for Figure 4 Enlarged view of section A in the middle; Figure 6 This is a structural diagram of the mixing tube; Figure 7 Structural diagram of the air intake assembly, drive assembly, adjustment component one, adjustment component two, spray pipe and air outlet pipe; Figure 8 This is a structural diagram of the piston plate, connecting rod, and wedge block; Figure 9 This is a partial structural diagram of the drive assembly, spray pipe, and air outlet pipe.

[0021] Explanation of reference numerals in the attached figures: 100. Waste gas treatment tower; 200. Dryer filter; 300. Heat exchanger; 400. RTO equipment; 500. Chimney; 600. Activated carbon adsorption box; 1. Mixing section; 2. Spraying section; 3. Spray pipe; 4. Baffle; 5. Waste gas chamber; 6. Treatment chamber; 7. Liquid chamber; 8. Mixing tube; 81. Air outlet; 82. Liquid discharge hole; 9. Intake assembly; 91. Housing; 92. Intake pipe; 93. Piston plate; 94. Elastic telescopic rod; 95. Connecting rod; 96. Wedge block; 97. Port; 98. Pressure relief pipe one; 941. Outer tube; 942. Inner tube; 943. Spring 1; 10. Drive assembly; 101. Vertical tube; 102. Movable rod; 103. Spring 2; 104. Guide sleeve; 105. Connecting rod 1; 106. Connecting rod 2; 107. Slide groove; 11. Adjusting component 1; 111. Housing 1; 112. Valve plate 1; 12. Adjusting component two; 121. Housing two; 122. Valve plate two; 13. Air inlet channel; 14. Liquid inlet pipe; 15. Air outlet pipe; 16. Sewage drain pipe; 17. Jacket; 18. Pressure relief pipe II. Detailed Implementation

[0022] To enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0023] This invention provides, for example Figures 1-9 The waste gas treatment equipment for ultra-high molecular weight polyethylene production shown includes a waste gas treatment tower 100 for deacidifying the waste gas. The waste gas treatment tower 100 includes a mixing section 1 and a spray section 2 fixed to the top of the mixing section 1. A spray pipe 3 is fixed to the top of the spray section 2. One end of the spray pipe 3 extends out of the outside of the spray section 2. High-pressure atomizing nozzles are evenly distributed at the bottom of the spray pipe 3 to increase the contact area between the spray liquid and the waste gas.

[0024] The lower space inside the mixing section 1 is divided into an exhaust gas chamber 5, a treatment chamber 6, and a liquid chamber 7 by two partitions 4 in sequence. The partitions 4 are sealed and fixed to the inner wall of the mixing section 1 to prevent cross-contamination. An air inlet channel 13 communicating with the exhaust gas chamber 5 is fixed on one side of the mixing section 1. Exhaust gas enters the exhaust gas chamber 5 through the air inlet channel 13. An inlet pipe 14 communicating with the liquid chamber 7 is fixed on the other side of the mixing section 1. Alkali solution (preferably sodium hydroxide solution) enters the liquid chamber 7 through the inlet pipe 14. The inlet pipe 14 is equipped with a flow control valve to regulate the injection volume of alkali solution. The spray pipe 3 is connected in parallel with the inlet pipe 14 to share the alkali solution source, simplifying the pipeline structure.

[0025] Next, multiple mixing tubes 8 are fixed inside the treatment chamber 6. The cross-section of the mixing tube 8 is triangular, and the inner wall of the mixing tube 8 is treated with polytetrafluoroethylene to prevent scaling, which can effectively prevent the accumulation of salt substances generated by the deacidification of waste gas on the inner and outer walls of the tube.

[0026] Each partition 4 has multiple through holes, and both ends of each mixing tube 8 are connected to the through holes. The bottom of the mixing tube 8 is evenly distributed with multiple liquid drop holes 82 to prevent waste liquid from accumulating in the tube.

[0027] Multiple vent holes 81 are evenly distributed on both sides of the mixing pipe 8, and a waterproof and breathable membrane is fixed inside the vent holes 81. The waterproof and breathable membrane is a new type of high-polymer waterproof material. Its core function is to block liquid water penetration while allowing gas to pass freely, achieving the effect of being breathable but waterproof. In addition, a waterproof and breathable membrane is also fixed in the through hole of the partition plate 4 near the exhaust gas chamber 5 to prevent the alkaline solution in the mixing pipe 8 from flowing back into the exhaust gas chamber 5.

[0028] like Figure 2 , Figure 3 and Figure 7 As shown, an air intake assembly 9 is provided on one side of the mixing section 1. The air intake assembly 9 includes a housing 91 fixed on the side of the air intake channel 13 away from the mixing section 1. An air intake pipe 92 is fixed on the side of the housing 91 away from the air intake channel 13. Two vertically distributed openings 97 are opened on the side of the housing 91 close to the air intake channel 13.

[0029] During the treatment process, industrial waste gas from the ultra-high molecular weight polyethylene production workshop and wastewater treatment waste gas are introduced into the inlet pipe 92. The waste gas then enters the waste gas chamber 5 along the outer shell 91, the inlet 97, and the inlet channel 13. Simultaneously, alkaline solution is injected into the liquid chamber 7 through the liquid inlet pipe 14. Next, the waste gas and alkaline solution enter the mixing pipe 8 from both ends, respectively. The waste gas and alkaline solution are mixed in a counter-current manner in the mixing pipe 8, achieving the first deacidification treatment of the waste gas. Then, the treated waste liquid in the mixing pipe 8 falls through the drop hole 82, while the treated waste gas rises through the outlet hole 81, causing the residual waste liquid in the upper layer to be discharged. The alkaline solution is mixed again with the rising waste gas from the lower layer, achieving a second deacidification treatment of the waste gas. Then, the waste gas rises again to the spray section 2, where the alkaline solution is sprayed out from the spray pipe 3 to spray the waste gas, achieving a third deacidification treatment of the waste gas. This achieves continuous multi-stage deacidification treatment of the waste gas, which can effectively remove acidic gases such as hydrogen chloride, sulfur oxides, and nitrogen oxides, prevent corrosion of subsequent equipment and pipelines, and meet environmental emission standards. The treated waste gas is discharged through the vent pipe 15 fixed at the top of the spray section 2, and the waste liquid is discharged into the sewage treatment pond for treatment through the sewage pipe 16 fixed at the bottom of the mixing section 1.

[0030] Next, a dryer filter 200 is installed at the output end of the exhaust gas treatment tower 100. The dryer filter 200 is a widely used device in gas treatment systems. The exhaust gas discharged from the exhaust pipe 15 enters the dryer filter 200 to remove moisture and impurities from the exhaust gas, so as to avoid the moisture and impurities in the exhaust gas from causing corrosion or blockage to subsequent equipment.

[0031] The output end of the dryer filter 200 is equipped with a heat exchanger 300, the output end of the heat exchanger 300 is equipped with an RTO device 400, the output end of the RTO device 400 is connected to a chimney 500, the RTO device 400 is a regenerative thermal incinerator, used to treat organic waste gas and volatile organic compounds (VOCs) and efficiently recover and utilize heat, the waste gas treated by the RTO device 400 is discharged through the chimney 500.

[0032] The output end of the heat exchanger 300 is also connected to the activated carbon adsorption box 600, and the activated carbon adsorption box 600 is connected to the input end of the chimney 500. In the event of abnormal operating conditions such as failure of RTO equipment 400, start-up and shutdown of the furnace, or sudden shutdown, the activated carbon adsorption box 600 can act as an emergency device to adsorb VOCs that have not been incinerated. The treated waste gas is finally discharged through the chimney 500 to prevent excessive emissions.

[0033] In actual waste gas treatment, increased intake volume is a common fluctuation due to upstream production processes, equipment operation, and operating condition adjustments. Therefore, if... Figure 2 , Figure 3 , Figure 7 , Figure 8 and Figure 9 As shown, the present invention has a piston plate 93 slidably disposed inside the outer casing 91, and the outer wall of the piston plate 93 is in contact with the inner wall of the outer casing 91. The side of the piston plate 93 near the air intake channel 13 is connected to the inner wall of the outer casing 91 by an elastic telescopic rod 94. The elastic telescopic rod 94 includes an outer tube 941 and an inner tube 942 disposed inside the outer tube 941. One end of the inner tube 942 extends out of the outer tube 941 and is fixed to the side of the piston plate 93 near the air intake channel 13. The other end of the inner tube 942 is connected to the inner wall of the outer tube 941 by a spring 943. The elastic coefficient of the spring 943 is adapted to the conventional air intake pressure range (0.1-0.3MPa) of the ultra-high molecular weight polyethylene production exhaust gas, ensuring that the piston plate 93 is in the initial position when the air intake is normal.

[0034] A wedge block 96 is fixed to the side of the piston plate 93 near the intake passage 13 via a connecting rod 95. Both the connecting rod 95 and the wedge block 96 are located on the top of the elastic telescopic rod 94. Multiple holes are provided on both the piston plate 93 and the wedge block 96 to allow exhaust gas to flow in the housing 91.

[0035] It also includes a drive assembly 10, which includes a vertical tube 101 fixed to the top of the housing 91. A movable rod 102 is provided inside the vertical tube 101. The bottom end of the movable rod 102 extends into the interior of the housing 91, and the inclined surface of the wedge block 96 is close to the vertical tube 101. The top end of the movable rod 102 is connected to the top end of the interior of the vertical tube 101 by a spring 103.

[0036] The bottom of the air outlet pipe 15 is provided with an adjusting component 11. The adjusting component 11 includes a housing 111 fixed to the bottom end of the air outlet pipe 15 and communicating with the interior of the air outlet pipe 15. A valve plate 112 is provided inside the housing 111.

[0037] The top of one end of the spray pipe 3 extending out of the spray section 2 is provided with an adjusting component 2 12. The adjusting component 2 12 includes a housing 2 121 fixed to the top of the spray pipe 3 and communicating with the inside of the spray pipe 3. A valve plate 2 122 is provided inside the housing 2 121. When the exhaust gas flow is normal, the valve plate 2 122 extends into the inside of the spray pipe 3.

[0038] The top outer wall of the vertical tube 101 is provided with a sliding groove 107. The top outer wall of the movable rod 102 is fixed with a connecting rod 105 and a connecting rod 106 distributed vertically. The end of the connecting rod 105 away from the movable rod 102 passes through the sliding groove 107 and the housing 111 and is fixed to the bottom of the valve plate 112. The end of the connecting rod 106 away from the movable rod 102 passes through the sliding groove 107 and the housing 121 and is fixed to the top of the valve plate 122. A plurality of guide sleeves 104 are fixed inside the vertical tube 101. The guide sleeves 104 are sleeved on the movable rod 102 and the movable rod 102 is slidably connected to the guide sleeves 104 to guide the movement of the movable rod 102.

[0039] When the air intake volume inside the outer casing 91 increases, the air pressure inside the outer casing 91 rises, pushing the piston plate 93 and the wedge block 96 to move closer to the vertical pipe 101. At the same time, it compresses the elastic telescopic rod 94. The movement of the wedge block 96 drives the movable rod 102 to move upward, compressing the second spring 103. Simultaneously, the upward movement of the movable rod 102 drives the valve plate 112 and the valve plate 122 to move upward through the connecting rod 105 and the connecting rod 106, respectively. The valve plate 112 enters the outlet pipe 15, reducing the flow area of ​​the outlet pipe 15, thereby slowing down the exhaust gas flow rate. The valve plate 122 moves upward, increasing the flow area of ​​the spray pipe 3, thereby increasing the alkaline spray flow rate. This invention ensures that the exhaust gas can still be fully deacidified when the air intake volume increases through the synergistic effect of slowing down the exhaust gas flow rate and increasing the alkaline spray flow rate. When the air intake volume returns to normal, the spring 943 and the spring 103 reset, driving all components to reset, and the equipment returns to normal operation.

[0040] Furthermore, the end of the piston plate 93 away from the elastic telescopic rod 94 is machined into a pyramidal surface with a cone angle of 60-90°. When the air intake in the outer shell 91 increases, the exhaust gas first diffuses along the pyramidal surface of the piston plate 93, and then enters the exhaust gas treatment tower 100 for treatment after being diverted through the hole on the piston plate 93. This reduces airflow impact and allows the exhaust gas to enter the exhaust gas chamber 5 smoothly, avoiding airflow fluctuations from affecting the treatment effect.

[0041] To avoid overpressure caused by increased air intake in the casing 91, such as Figure 3 and Figure 7 As shown, a pressure relief pipe 98 is fixed between the bottom of the outer shell 91 and one side of the mixing section 1. One end of the pressure relief pipe 98 is connected to the side of the piston plate 93 in the inner cavity of the outer shell 91 away from the elastic telescopic rod 94, and the other end of the pressure relief pipe 98 is connected to the exhaust gas chamber 5. A pressure relief valve is fixed on the pressure relief pipe 98, and the opening pressure is set to 0.35MPa. When the gas pressure inside the outer shell 91 exceeds the set threshold, the pressure relief valve is automatically opened to introduce the excess exhaust gas into the exhaust gas chamber 5 for treatment, so as to avoid overpressure of the outer shell 91.

[0042] like Figure 2 and Figure 3 As shown, since the acid-base neutralization reaction inside the waste gas treatment tower 100 continuously releases heat, the present invention has a jacket 17 fixed on the outer wall of the spray section 2. The cooling medium (preferably circulating water or heat transfer oil) is introduced into the jacket 17 to cool the inside of the waste gas treatment tower 100. On the one hand, this avoids the abnormal increase in gas pressure inside the tower due to excessive temperature and maintains the stability of gas pressure inside the tower. On the other hand, the output end of the jacket 17 is connected to the input end of the heat exchanger 300. After the temperature is raised, the cooling medium and the waste gas treated by the dryer filter 200 exchange heat in the heat exchanger 300, further increasing the preheating temperature of the waste gas, realizing the recovery and utilization of heat, and reducing energy consumption.

[0043] In addition, a pressure relief pipe 2 18 is fixed on the top outer wall of the spray section 2 inside the exhaust gas treatment tower 100. The pressure relief pipe 2 18 is located above the spray pipe 3, and a pressure relief valve is fixed on the pressure relief pipe 2 18. The opening pressure is set to 0.4MPa. The pressure relief pipe 2 18 is connected to the input end of the dryer filter 200. When the gas pressure inside the exhaust gas treatment tower 100 exceeds the set threshold, the pressure relief valve automatically opens to introduce the exhaust gas inside the tower into the subsequent treatment unit to ensure the safety of the tower body.

[0044] It should be noted that, in practical applications, the present invention can be configured with corresponding sealing structures according to usage requirements. For example, sealing treatment can be applied between the outer wall of the piston plate 93 and the inner wall of the outer shell 91; between the inner and outer tubes of the elastic telescopic rod 94; between the valve plate 112 and the air outlet pipe 15; between the connecting rod 105 and the shell 111; between the valve plate 122 and the spray pipe 3; and between the connecting rod 106 and the shell 121. All of the above-mentioned sealing technologies fall within the scope of existing technology and will not be further elaborated upon in this invention.

[0045] The foregoing has only described certain exemplary embodiments of the present invention by way of illustration. Undoubtedly, those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the foregoing drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. An off-gas treatment apparatus for the production of ultra-high molecular weight polyethylene, characterized by: The exhaust gas treatment tower (100), the drying filter (200), the heat exchanger (300), the RTO device (400), the chimney (500) and the activated carbon adsorption box (600) are sequentially arranged along the exhaust gas treatment flow direction; The exhaust gas treatment tower (100) comprises a mixing section (1) and a spraying section (2) fixed to the top end of the mixing section (1), the space below the mixing section (1) is sequentially divided into an exhaust gas cavity (5), a treatment cavity (6) and a liquid cavity (7) by two partition plates (4), a plurality of mixing pipes (8) are fixed in the treatment cavity (6) for continuously treating the exhaust gas in multiple ways. The mixing section (1) is provided with an air inlet assembly (9) and a driving assembly (10) on one side for fully treating the exhaust gas when the air inlet amount in the exhaust gas treatment tower (100) increases.

2. The waste gas treatment apparatus for the production of ultra-high molecular weight polyethylene according to claim 1, characterized by: The cross section of the mixing pipe (8) is triangular, and a through hole corresponding to the mixing pipe (8) is formed in each partition plate (4). The two side walls of the mixing pipe (8) are uniformly provided with a plurality of air outlet holes (81), and a waterproof and breathable film is fixed in the air outlet hole (81).

3. The waste gas treatment apparatus for the production of ultra-high molecular weight polyethylene according to claim 2, characterized by: The mixing section (1) is fixed with an air inlet channel (13) communicated with the exhaust gas cavity (5) on one side, and is fixed with a liquid inlet pipe (14) communicated with the liquid cavity (7) on the other side. The exhaust gas enters the exhaust gas cavity (5) through the air inlet channel (13) and then enters the mixing pipe (8), and the lye enters the liquid cavity (7) through the liquid inlet pipe (14) and then enters the mixing pipe (8), so that the exhaust gas and the lye are mixed in the mixing pipe (8) to realize the first treatment, the treated waste liquid falls through the liquid falling hole (82), and the treated exhaust gas rises through the air outlet hole (81), the residual lye in the upper falling waste liquid is mixed with the lower rising exhaust gas to realize the second treatment, and finally the waste liquid is discharged through the blowdown pipe (16).

4. The off-gas treatment apparatus for the production of ultra-high molecular weight polyethylene according to claim 3, characterized by: The spraying section (2) is fixed with a spraying pipe (3) at the top, one end of the spraying pipe (3) extends out of the spraying section (2), the lye enters the spraying pipe (3) to spray the second treated exhaust gas downward to realize the third treatment of the exhaust gas, and the treated exhaust gas is discharged through the air outlet pipe (15) fixed to the top end of the spraying section (2).

5. The off-gas treatment apparatus for the production of ultra-high molecular weight polyethylene according to claim 4, characterized by: The air inlet assembly (9) comprises an outer shell (91) fixed to the side of the air inlet channel (13) away from the mixing section (1), the outer shell (91) is fixed with an air inlet pipe (92) on the side away from the air inlet channel (13), and the outer shell (91) is provided with two upper and lower through openings (97) on the side close to the air inlet channel (13), and the exhaust gas enters the exhaust gas cavity (5) along the air inlet pipe (92), the outer shell (91), the through opening (97) and the air inlet channel (13). The outer shell (91) is slidably provided with a piston plate (93), and the outer wall of the piston plate (93) is attached to the inner wall of the outer shell (91), and the side of the piston plate (93) close to the air inlet channel (13) is connected to the inner wall of the outer shell (91) through an elastic expansion rod (94). The elastic telescopic rod (94) comprises an outer tube (941) and an inner tube (942) arranged inside the outer tube (941), one end of the inner tube (942) extends outside the outer tube (941) and is fixed to one side of the piston plate (93) close to the air inlet channel (13), and the other end of the inner tube (942) is connected with the inner wall of the outer tube (941) through a spring (943); The piston plate (93) is fixed with a wedge block (96) on the side close to the air inlet channel (13) through a connecting rod (95), and the connecting rod (95) and the wedge block (96) are arranged on the top of the elastic telescopic rod (94).

6. The off-gas treatment apparatus for the production of ultra-high molecular weight polyethylene according to claim 5, characterized by: The driving assembly (10) comprises a vertical pipe (101) fixed to the top end of the shell (91), the vertical pipe (101) is internally provided with a movable rod (102), the bottom end of the movable rod (102) extends into the shell (91), and the inclined surface of the wedge block (96) is close to the vertical pipe (101), and the top end of the movable rod (102) is connected with the inner top end of the vertical pipe (101) through a spring (103); A plurality of guide sleeves (104) are fixed in the vertical pipe (101), the guide sleeves (104) are sleeved on the movable rod (102), and the movable rod (102) and the guide sleeves (104) are in sliding connection, for guiding the movement of the movable rod (102).

7. The waste gas treatment apparatus for the production of ultra-high molecular weight polyethylene according to claim 6, characterized by: The bottom of the air outlet pipe (15) is provided with an adjusting part (11), the adjusting part (11) comprises a housing (111) fixed to the bottom end of the air outlet pipe (15) and communicating with the inside of the air outlet pipe (15), and the inside of the housing (111) is provided with a valve plate (112); The end of the spraying pipe (3) extending out of the spraying section (2) is provided with an adjusting part (12), the adjusting part (12) comprises a housing (121) fixed to the top end of the spraying pipe (3) and communicating with the inside of the spraying pipe (3), and the inside of the housing (121) is provided with a valve plate (122), and the valve plate (122) extends into the inside of the spraying pipe (3); The top outer wall of the vertical pipe (101) is provided with a sliding groove (107), the top outer wall of the movable rod (102) is fixed with an upper and lower connecting rod (105) and a connecting rod (106), one end of the connecting rod (105) away from the movable rod (102) penetrates the sliding groove (107) and the housing (111) and is fixed to the bottom end of the valve plate (112), and one end of the connecting rod (106) away from the movable rod (102) penetrates the sliding groove (107) and the housing (121) and is fixed to the top end of the valve plate (122); When the amount of air in the shell (91) increases, the piston plate (93) is pushed to move, the wedge block (96) is driven to move to drive the movable rod (102) to move upwards, thereby driving the valve plate (112) to move to slow down the exhaust gas flow rate in the air outlet pipe (15), and driving the valve plate (122) to move to increase the spraying amount of the spraying pipe (3), for fully treating the exhaust gas.

8. The off-gas treatment apparatus for the production of ultra-high molecular weight polyethylene according to claim 5, characterized by: The piston plate (93) is processed into a pyramid surface at one end away from the elastic telescopic rod (94), and a plurality of holes are formed on the piston plate (93) and the wedge-shaped block (96) for shunting the exhaust gas to make the exhaust gas enter the exhaust gas cavity (5) smoothly. The outer shell (91) is fixed with a pressure relief pipe (98) between the bottom and one side of the mixing section (1), one end of the pressure relief pipe (98) is communicated with the side of the piston plate (93) away from the elastic telescopic rod (94) in the inner cavity of the outer shell (91), the other end of the pressure relief pipe (98) is communicated with the exhaust gas cavity (5), and the pressure relief valve is fixed on the pressure relief pipe (98).

9. The off-gas treatment apparatus for the production of ultra-high molecular weight polyethylene according to claim 4, characterized by: The drying filter (200) is arranged at the output end of the exhaust gas treatment tower (100) for removing water and impurities in the exhaust gas. The heat exchanger (300) is arranged at the output end of the drying filter (200), the RTO device (400) is arranged at the output end of the heat exchanger (300), and the chimney (500) is connected to the output end of the RTO device (400) for treating VOCs in the exhaust gas, and the treated exhaust gas is discharged through the chimney (500). The activated carbon adsorption box (600) is connected to the output end of the heat exchanger (300), and the activated carbon adsorption box (600) is connected to the input end of the chimney (500), which serves as an emergency device to adsorb VOCs that are not treated by the RTO device (400) in an emergency, and the treated exhaust gas is discharged through the chimney (500).

10. The off-gas treatment apparatus for the production of ultra-high molecular weight polyethylene according to claim 9, characterized by: The jacket (17) is fixed to the outer wall of the spraying section (2), the cooling medium enters the jacket (17) to cool the inside of the exhaust gas treatment tower (100), which helps to maintain the stability of the internal pressure of the exhaust gas treatment tower (100), the output end of the jacket (17) is connected to the input end of the heat exchanger (300), and the cooling medium is heated and exchanges heat with the exhaust gas treated by the drying filter (200) in the heat exchanger (300) to preheat the exhaust gas entering the RTO device (400) and reduce energy consumption. The pressure relief pipe (18) is fixed to the outer wall of the top of the spraying section (2), the pressure relief pipe (18) is arranged above the spraying pipe (3), and the pressure relief valve is fixed on the pressure relief pipe (18), and the pressure relief pipe (18) is connected to the input end of the drying filter (200).

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