A catalyst, a treatment method and a treatment system for ethylene tail gas treatment

Abstract

The present invention relates to the technical field of catalysts, and discloses a catalyst, a treatment method and a treatment system for ethylene tail gas treatment, wherein the catalyst for ethylene tail gas treatment comprises the following raw materials in parts by weight: 1.7-2.3% nickel, 0.8-1.2% sulfur, 0.16-0.35% cobalt, 0.03-0.07% chromium, 8.2-14.2% sulfur dioxide and 81-92% aluminum oxide. The catalyst provided by the present invention has the advantages of strong stability and fast reaction speed, and when it loses activity, it only needs to adjust the temperature of the catalyst bed by adding nitrogen to restore activity in a short time, which is conducive to shortening the catalyst regeneration time, thereby reducing the waiting time of the ethylene tail gas treatment system, and better meeting the actual use requirements.

Description

Technical Field

[0001] The present invention relates to the technical field of tail gas treatment, and more specifically, to a catalyst, a treatment method and a treatment system for ethylene tail gas treatment. Background Art

[0002] During the industrial production and processing of ethylene, the use of ethylene equipment to produce ethylene will generate a large amount of tail gas, which contains some valuable hydrocarbon components and combustible substances. In order to avoid waste of resources, the factory generally transports the tail gas to a comprehensive utilization system, and performs pre-treatment filtration, condensation cooling, component separation and other steps on the tail gas in turn, so as to recover the usable part of the tail gas.

[0003] At present, in the ethylene tail gas treatment process, a special ethylene treatment catalyst is used, which can effectively remove harmful substances and impurities in ethylene tail gas, and facilitate the subsequent separation and recycling of recyclable components in ethylene. However, after the existing ethylene tail gas catalyst is deactivated after long-term use, the regeneration time required is relatively long, resulting in a long waiting time for the ethylene recovery system, which is not conducive to meeting the actual ethylene tail gas treatment needs. Summary of the invention

[0004] The purpose of the present invention is to provide a catalyst, a treatment method and a treatment system for ethylene tail gas treatment, so as to solve the above technical problems.

[0005] The present invention solves the above-mentioned technical problems through the following technical solutions:

[0006] The invention provides a catalyst for treating ethylene tail gas, comprising the following raw materials in parts by weight: 1.7-2.3% nickel, 0.8-1.2% sulfur, 0.16-0.35% cobalt, 0.03-0.07% chromium, 8.2-14.2% sulfur dioxide and 81-92% aluminum oxide.

[0007] A method for treating ethylene tail gas comprises the following steps:

[0008] S1. Use nitrogen to preheat the reactor bed temperature to 370°C, gradually increase the flow rate of reducing hydrogen, and control the internal temperature of the reactor to rise less than 50°C;

[0009] S2. When there is no temperature rise at the inlet and outlet of the reactor bed, S1 is terminated;

[0010] S3, control the reactor bed temperature to 370-400°C, adjust the injection amount of the sulfiding agent, control the outlet sulfur volume fraction to 0.5-1%, and maintain it for 5-6 hours;

[0011] S4, when the outlet hydrogen sulfide volume fractions of the three analyses all exceed 0.5%, S3 is terminated;

[0012] S5. After the catalyst loses its activity, nitrogen is introduced to heat the catalyst bed temperature to 150-155°C, and steam is introduced to heat to 370-400°C at a heating rate of less than 80°C / h, and maintained for 6-7h;

[0013] S6. Gradually introduce air to maintain the catalyst bed temperature at 480-500°C;

[0014] S7. When the inlet and outlet temperatures of the bed are the same and the volume fraction of CO at the outlet drops below 0.1%, repeat S1 until the tail gas treatment is completed.

[0015] A treatment system, comprising: a pre-treatment device, a condensation device, a separation device, a recovery device and a catalytic reaction device connected in sequence, wherein the pre-treatment device is used to remove particulate matter in tail gas, the separation device is used to separate various components in ethylene, the condensation device comprises a body, a condensation box is installed in the body, a condensation medium treatment component is installed on one side of the condensation box, the input and output ends of the condensation medium treatment component are connected to a delivery pipe, two of the delivery pipes are respectively located at the upper and lower ends of the condensation box, a plurality of rows of evenly distributed heat exchange tubes are arranged inside the condensation box, the upper and lower ends of the heat exchange tubes are connected to the delivery pipe through an adjustment component, a power source is arranged in the body, and the power source is connected to the two adjustment components;

[0016] The regulating component includes a driving member, a space regulating member and a plurality of connecting pipes, wherein the plurality of connecting pipes are correspondingly connected to the ends of the heat exchange tubes, and the plurality of connecting pipes are commonly connected to the driving member, and the space regulating member is connected to the driving member, and is used to adjust the cross-sectional area of ​​the exhaust gas passing through the condensation box, and the driving member is used to drive the corresponding rows of the heat exchange tubes to rotate closer to each other, and at the same time drive the space regulating member to perform adaptive regulating actions, and the connecting pipes have the ability to adapt to the movement of the heat exchange tubes.

[0017] As a further optimization scheme of the present invention, the driving member includes a plurality of driving rack groups, a plurality of transmission gears and a plurality of fixed rack groups, and the plurality of transmission gears are fixedly sleeved on one end of the connecting pipe fitting accordingly, and the plurality of driving rack groups are connected to the transmission gears of the corresponding row, and the driving rack group includes two first racks, and the two first racks are slidably installed on the outside of the condensation box, and the first racks are meshed with the transmission gears of the corresponding row, and the ends of the first racks located at the same end are commonly connected with a connecting plate, and the plurality of fixed rack groups are connected to the transmission gears of the corresponding row, and the fixed rack group includes two second racks, and the second racks are meshed with the transmission gears of the corresponding row, and the second racks are arranged on the outside of the condensation box.

[0018] As a further optimization scheme of the present invention, the fixed rack group also includes two fixed seats, the second rack is slidably mounted on one end of the fixed seat, a return spring is fixedly mounted between the second rack and the fixed seat, an electromagnet is mounted on the inner side of the fixed seat, and the electromagnet is parallel to the second rack.

[0019] As a further optimization scheme of the present invention, the power source includes a driving motor, two limit rods, two screw rods and a transmission connecting piece. The driving motor is fixedly installed on the outside of the condensation box. The two screw rods are symmetrically arranged at the upper and lower ends of the condensation box. Both ends of the screw rods are rotatably connected to the inner wall of the machine body. The two ends of the screw rods are respectively threadedly connected to the corresponding connecting plates. The two limit rods are symmetrically arranged at the upper and lower ends of the condensation box. Both ends of the limit rods are fixedly connected to the inner wall of the machine body. The two ends of the limit rods are respectively slidably connected to the corresponding connecting plates. The transmission connecting piece is used to connect the driving motor with the two screw rods.

[0020] As a further optimization scheme of the present invention, the transmission connecting member includes a first pulley and two second pulleys, the first pulley is fixedly connected to the rotating end of the driving motor, and the two second pulleys are correspondingly installed on the ends of the screw rod, and the two second pulleys are connected to the first pulley through a transmission belt.

[0021] As a further optimization scheme of the present invention, the connecting pipe fitting includes a connecting head and a connecting short pipe, the connecting head is fixedly installed on a side of the delivery pipe close to the condensation box, one end of the connecting short pipe is fixedly connected to the end of the heat exchange tube, and the other end is connected to the connecting head through a flexible pipe, the end of the flexible pipe is rotatably connected to the end of the connecting short pipe, a rotating rod is rotatably installed on the outer side of the connecting head, and the other end of the rotating rod is rotatably connected to the outer side of the flexible pipe, and the upper and lower ends of the condensation box are provided with sliding grooves corresponding to the connecting short pipes, and a first sealing plate is slidably installed in the sliding groove, and the first sealing plate is fixedly connected to the corresponding row of the connecting short pipes.

[0022] As a further optimization solution of the present invention, the flexible tube is a spring hose made of metal material, and the number of the rotating rods is two, and the two rotating rods are symmetrically distributed on both sides of the connecting head.

[0023] As a further optimization scheme of the present invention, the space adjustment member includes two movable plates, and the two movable plates are symmetrically slidably installed at the two ends of the condensation box. The upper and lower ends of the condensation box are provided with clearance grooves, and a second sealing plate is slidably installed in the clearance groove. One end of the second sealing plate is fixedly connected to one end of the movable plate, and the other end is threadedly connected to the outer side of the screw rod.

[0024] The beneficial effects of the present invention are:

[0025] The catalyst provided in the present invention has the advantages of strong stability and fast reaction speed. When the catalyst loses its activity, it can be restored in a short time by simply adding nitrogen to adjust the temperature of the catalyst bed, which is beneficial to shortening the catalyst regeneration time, thereby reducing the waiting time of the ethylene tail gas treatment system and better meeting actual use needs. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is a schematic diagram showing the relationship between the activity, temperature and sulfur content of a catalyst for treating ethylene tail gas provided by the present invention;

[0027] Figure 2 It is a statistical diagram of dimethyl disulfide at the reactor inlet when a catalyst for treating ethylene tail gas provided by the present invention is used;

[0028] Figure 3 It is a structural schematic diagram of a catalyst for treating ethylene tail gas and a treating device thereof provided by the present invention;

[0029] Figure 4 It is a schematic structural diagram of a catalyst for treating ethylene tail gas and a condensing device in a treating device thereof provided by the present invention;

[0030] Figure 5 It is a structural schematic diagram of a catalyst for treating ethylene tail gas and a condenser box in a treating device thereof provided by the present invention;

[0031] Figure 6 This is a schematic diagram of the structure of a heat exchange tube, a regulating component, and a power source in an ethylene tail gas treatment system provided by the present invention;

[0032] Figure 7 This is a structural schematic diagram of the top of a condensation tank in an ethylene tail gas treatment system provided by the present invention;

[0033] Figure 8 It is a structural schematic diagram of a power source and a driving rack assembly in an ethylene tail gas treatment system provided by the present invention;

[0034] Fig. 9 It is a structural schematic diagram of the local position of the connecting pipe and the condensation box in an ethylene tail gas treatment system provided by the present invention;

[0035] Fig.10 It is a structural schematic diagram of a connecting pipe, a conveying pipe and a heat exchange pipe in an ethylene tail gas treatment system provided by the present invention;

[0036] Fig.11It is a structural schematic diagram between a space regulating component and a condensing box in an ethylene tail gas treatment system provided by the present invention.

[0037] In the figure: 1, pre-treatment device; 2, condensation device; 21, body; 22, condensation box; 23, condensation medium treatment part; 24, heat exchange tube; 25, power source; 251, driving motor; 252, limit rod; 253, screw rod; 254, first pulley; 255, second pulley; 256, transmission belt; 26, adjustment component; 261, driving member; 2611, driving rack group; 2612, transmission gear; 2613, fixed rack group; 2614, connecting plate; 2615, fixed Fixed seat; 2616, return spring; 2617, electromagnet; 262, space adjustment member; 2621, movable plate; 2622, give way groove; 2623, second blocking plate; 263, connecting pipe; 2631, connector; 2632, connecting short pipe; 2633, flexible pipe; 2634, rotating rod; 2635, slide groove; 2636, first blocking plate; 27, conveying pipe; 28, air inlet; 29, air outlet; 3, separation device; 4, recovery device; 5, catalytic reaction device. DETAILED DESCRIPTION

[0038] The subject matter described herein will now be discussed with reference to example embodiments. It should be understood that the discussion of these embodiments is only to enable those skilled in the art to better understand and implement the subject matter described herein, and the functions and arrangements of the elements discussed may be changed without departing from the scope of protection of the contents of this specification. Each example may omit, replace or add various processes or components as needed. In addition, the features described relative to some examples may also be combined in other examples.

[0039] Example 1

[0040] In this embodiment, a catalyst for treating ethylene tail gas is proposed, which includes the following raw materials in mass percentage: 1.7% nickel, 0.8% sulfur, 0.16% cobalt, 0.03% chromium, 8.2% sulfur dioxide, and 89.11% aluminum oxide.

[0041] Example 2

[0042] In this embodiment, a catalyst for treating ethylene tail gas is proposed, which includes the following raw materials in mass percentage: 2.3% nickel, 1.2% sulfur, 0.35% cobalt, 0.07% chromium, 14.2% sulfur dioxide, and 81.88% aluminum oxide.

[0043] Example 3

[0044] In this embodiment, a catalyst for treating ethylene tail gas is proposed, which includes the following raw materials in mass percentage: 2.0% nickel, 1.0% sulfur, 0.20% cobalt, 0.05% chromium, 10.0% sulfur dioxide, and 86.75% aluminum oxide.

[0045] Example 4

[0046] In this embodiment, a catalyst for treating ethylene tail gas is proposed, which includes the following raw materials in mass percentage: 1.7% nickel, 1.2% sulfur, 0.16% cobalt, 0.07% chromium, 14.2% sulfur dioxide, and 82.67% aluminum oxide.

[0047] Example 5

[0048] In this embodiment, a method for treating ethylene tail gas using the catalyst in Example 3 is proposed, comprising the following steps:

[0049] S1. Use nitrogen to preheat the reactor bed temperature to 370°C, gradually increase the flow rate of reducing hydrogen, and control the internal temperature of the reactor to rise less than 50°C;

[0050] S2. When there is no temperature rise at the inlet and outlet of the reactor bed, S1 is terminated;

[0051] S3, controlling the reactor bed temperature, which can be selected at 370, 380 or 400° C. in this embodiment, and preferably controlling the reactor bed temperature at 380° C. in this embodiment, adjusting the injection amount of the sulfiding agent, controlling the outlet sulfur volume fraction, which can be selected at 0.5%, 0.75% or 1% in this embodiment, and maintaining it for 5h, 5.5h and 6h in this embodiment;

[0052] S4, when the outlet hydrogen sulfide volume fractions of the three analyses all exceed 0.5%, S3 is terminated;

[0053] S5, after the catalyst loses its activity, nitrogen is introduced to heat the catalyst bed temperature, which can be selected to be 150 or 155°C in this embodiment, and steam is introduced to heat to a preset value at a heating rate of less than 80°C / h. In this embodiment, the heating rate can be selected to be 370, 390 or 400°C, and maintained for a preset time, which can be selected to be 6h, 6.5h or 7h in this embodiment. In this embodiment, the preferred bed temperature is 150°C, the preferred heating rate is 400°C, and the preferred maintenance time is 6h;

[0054] S6, gradually introduce air to maintain the catalyst bed temperature. In this embodiment, the catalyst bed temperature can be 480° C., 490° C. or 500° C., and in this embodiment, the catalyst bed temperature is preferably 500° C.;

[0055] S7. When the inlet and outlet temperatures of the bed are the same and the volume fraction of CO at the outlet drops below 0.1%, repeat S1 until the tail gas treatment is completed.

[0056] It should be noted that in the above method, the control of its operating parameters, under the premise that the process medium is basically stable, is mainly achieved by controlling the catalyst selectivity (by limiting activity) through the inlet temperature and the addition of sulfur. In normal operation, in order to prevent the production of highly toxic nickel carbonyl, the inlet temperature is generally controlled at no less than 210°C, preferably above 215°C, and gradually increased during the operation cycle according to the changes in the export product indicators. However, it should be noted that when the outlet temperature exceeds 260°C, the tendency of carbon or polymer deposition will increase, shortening the catalyst operation cycle.

[0057] Generally speaking, high temperature generally increases the activity of the catalyst, but it will also correspondingly increase the effectiveness of sulfur in the feed, which may eventually lead to reduced activity.

[0058] In order to control the activity and selectivity, it is very important to have an on-site sulfurized catalyst and control the addition of low concentration sulfur (2-35g / g) in the process feed. Generally speaking, a higher concentration of sulfur is required at the beginning of the operation, while a lower concentration of sulfur is required at the end of the operation. The control of the two main parameters of the reactor inlet temperature and the inlet dimethyl disulfide concentration is shown in Figure 2 .from Figure 2 It can be seen that in the process of adjusting the two important parameters, the catalyst can be roughly divided into three stages from commissioning to stable operation. The first is the initial exploration stage of the device (from June 30 to the end of July). Due to insufficient operating experience, in order to prevent the new catalyst from over-active and overheating, more sulfur was injected in the early stage of operation to suppress its activity. At the same time, in order to ensure the export product is qualified and find a suitable operating point, the inlet temperature was constantly adjusted. Frequent operation adjustments caused the reactor to experience large fluctuations in the inlet, outlet and bed temperatures during commissioning, and even the highest outlet temperature reached nearly 240°C. The second stage (from the end of July to the end of August) is the optimization and adjustment stage of the reactor's operating parameters. Under the premise that the inlet temperature is stable at 215°C, the injection amount of sulfur was gradually reduced from 30mg / 1 to about 15 mg / L from August 11. In the same period of time, it can be clearly seen that the bed outlet temperature rose by 3-5°C, indicating that the catalyst activity has increased significantly (the temperature rise of the entire bed is basically between 6-8°C). When the inlet temperature is reduced by about 1°C, the activity decreases, and the outlet temperature decreases accordingly and remains stable. The third stage (after September) is the stable operation stage of the reactor. The inlet temperature is basically stable between 214-216℃, and the sulfur injection rate is also stable and small.

[0059] Example 6

[0060] Please refer to Figures 3 to 11In this embodiment, a treatment system using the method of Example 5 is proposed, and the treatment system includes: a pretreatment device 1, a condensing device 2, a separation device 3, a recovery device 4, and a catalytic reaction device 5 connected in sequence by pipelines, the pretreatment device 1 is used to remove particulate matter in the exhaust gas, the separation device 3 is used to separate the components in the condensed ethylene exhaust gas, the recovery device 4 collects the separated usable components, and the catalytic reaction device 5 is used to perform catalytic reaction treatment on the ethylene exhaust gas, wherein the pretreatment device 1, the separation device 3 and the recovery device 4 are all existing technologies, and their internal structures and principles are not described in detail.

[0061] The condensing device 2 includes a body 21, a condensing box 22 is installed in the body 21, and a condensing medium processing component 23 is installed on one side of the condensing box 22. The condensing medium processing component 23 is used to drive the condensing medium to circulate and cool the condensing medium; the input and output ends of the condensing medium processing component 23 are connected to the delivery pipe 27, and the two delivery pipes 27 are respectively located at the upper and lower ends of the condensing box 22. Three rows of evenly distributed heat exchange tubes 24 are arranged inside the condensing box 22, and each row of heat exchange tubes 24 is staggered. A total of eleven heat exchange tubes 24 are arranged, and the number of rows and the number of heat exchange tubes 24 can be adjusted according to actual conditions; the upper and lower ends of the heat exchange tube 24 are connected to the delivery pipe 27 through the adjusting component 26, and the heat exchange tube 24, the adjusting component 26 and the delivery pipe 27 form a closed pipeline, so that the condensing medium It can circulate therein; a power source 25 is provided in the body 21, and the power source 25 is connected to two adjusting components 26, and the power source 25 is used to provide power for the two adjusting components 26 at the same time; the adjusting component 26 includes a driving member 261, a space adjusting member 262 and eleven connecting pipes 263, the eleven connecting pipes 263 are correspondingly connected to the ends of the heat exchange tubes 24, the eleven connecting pipes 263 are commonly connected to the driving member 261, the space adjusting member 262 is connected to the driving member 261, which is used to adjust the cross-sectional area of ​​the exhaust gas passing through the condensation box 22, and mainly adjusts the length of the cross-sectional area. The driving member 261 is used to drive the corresponding rows of heat exchange tubes 24 to rotate closer to each other, and at the same time drive the space adjusting member 262 to perform adaptive adjustment actions, and the connecting pipe 263 has the ability to adapt to the movement of the heat exchange tubes 24.

[0062] It should be noted that an exhaust gas flow monitoring component is provided in the pretreatment device 1 for monitoring the exhaust gas volume passing through per unit time. When the exhaust gas volume passing through is lower than a preset standard volume, the heat exchange tube 24 can be adjusted to a minimum exhaust gas treatment state. During the adjustment, the external controller receives the information generated by the exhaust gas flow monitoring component and starts to control the operation of the driving component 261. The connecting pipes 263 at the upper and lower ends of the heat exchange tube 24 are driven by the driving component 261 to rotate simultaneously and gradually approach each other. Since the connecting pipes 263 have the function of adapting to the activity of the heat exchange tube 24, the active heat exchange tube 24 is always connected to the delivery tube 2 7 maintains the connected state, and the movable heat exchange tube 24 is tightened toward the middle as a whole, and the spacing is reduced. At the same time, the space adjustment member 262 is driven by the driving member 261 and synchronously follows the movement of the heat exchange tube 24, so that the cross-sectional length of the heat exchange tube 24 is adapted to be reduced. After the heat exchange tube 24 reaches the preset adjustment amount, the driving member 261 stops running, the heat exchange tube 24 stops moving, and the state adjustment of the heat exchange tube 24 is completed. At this time, the spacing of the heat exchange tube 24 is reduced, and the length of the cross-sectional area at the location is shortened. At this time, when a small amount of exhaust gas passes through, it can be concentratedly contacted with the outer side of the heat exchange tube 24 for heat exchange and heat exchange is carried out.

[0063] In the condensing device 2 set up in the present invention, an adjusting component 26 is set up to adjust the spacing of the heat exchange tubes 24 and the cross-sectional area of ​​the exhaust gas passing through the heat exchange zone. When it is monitored that the exhaust gas flow rate decreases, the heat exchange tubes 24 in the same row are driven by the driving member 261 to rotate simultaneously and move closer to the middle, so that the spacing of the heat exchange tubes 24 in each row is reduced, and the heat exchange tubes 24 are tightened toward the middle as a whole. The space adjusting member 262 moves synchronously with the driving member 261, so that the cross-sectional length of the exhaust gas passing through the heat exchange zone can be shortened to adapt to the state change of the heat exchange tubes 24. The adjusted heat exchange tubes 24 and the cross-sectional area make the exhaust gas have a higher dispersion density after entering the heat exchange zone, a larger contact area with the heat exchange tubes 24, and more contact opportunities, which is beneficial to improving the heat exchange efficiency of the exhaust gas and realizes the synchronous adaptation function of the heat exchange tubes 24 and the changes in the exhaust gas intake.

[0064] In order to realize the function of adjusting a plurality of heat exchange tubes 24 at the same time so that each row of heat exchange tubes 24 can rotate and move closer to each other, the present invention provides a specific implementation of a driving member 261, which is as follows: the driving member 261 includes three driving rack groups 2611, eleven transmission gears 2612 and three fixed rack groups 2613. The number of the driving rack groups 2611 and the fixed rack groups 2613 is the same as the actual number of rows of heat exchange tubes 24, and the number of the transmission gears 2612 is the same as the number of heat exchange tubes 24; the transmission gear 2612 is fixedly sleeved on one end of the connecting pipe 263, and the driving rack group 2611 is fixedly sleeved on one end of the connecting pipe 263. 11 is connected to the corresponding row of transmission gears 2612, the driving rack group 2611 includes two first racks, the two first racks are staggered front and back and symmetrically slidably installed on the outside of the condensing box 22, the first racks are meshed with the corresponding row of transmission gears 2612, and the ends of the first racks located at the same end are commonly connected with a connecting plate 2614, the fixed rack group 2613 is connected to the corresponding row of transmission gears 2612, the fixed rack group 2613 includes two second racks, the two second racks are staggered front and back and symmetrically distributed, the second racks are meshed with the corresponding row of transmission gears 2612, and the second racks are fixed to the outside of the condensing box 22.

[0065] It should be noted that, since the present embodiment is provided with three rows of heat exchange tubes 24, and the middle row is provided with three heat exchange tubes 24, the heat exchange tube 24 located in the middle is exactly on the central axis, so it does not need to be moved, and it is only necessary to adjust the heat exchange tubes 24 on both sides thereof to be closer to it. At this time, the transmission gear 2612 corresponding to the heat exchange tube 24 is not engaged with the corresponding second rack, but is only engaged with the corresponding first rack, so that it can rotate on its own.

[0066] When the driving member 261 is in use, it is operated by the power source 25, so that the two driving members 261 at the upper and lower ends of the condensing box 22 move at the same time, and the two connecting plates 2614 at the same end begin to gradually move closer together, and the first rack connected to the connecting plate 2614 moves synchronously and adaptively. The movement of the first rack can drive the transmission gear 2612 meshed with it to rotate. Since the other side of the transmission gear 2612 is meshed with the second rack, and the second rack remains fixed, the transmission gear 2612 gradually rolls along the second rack straight line, and the connecting pipe 263 is Following the transmission gear 2612, it slides along the outer side of the condenser box 22. Since the connecting pipe 263 can adapt to the rotation and movement of the transmission gear 2612, the connecting pipe can drive the heat exchange tube 24 to rotate and move in a straight line. The spacing of the heat exchange tube 24 moving toward the middle gradually decreases until the heat exchange tube 24 reaches the set adjustment amount. The power source 25 stops running, the connecting plate 2614 and the first rack no longer move, and the transmission gear 2612, the connecting pipe and the heat exchange tube 24 stop moving, completing the spacing adjustment operation of the heat exchange tube 24.

[0067] The driving member 261 provided in the present invention completes the adjustment action by driving the heat exchange tubes 24 to rotate and move closer. On the one hand, by controlling the rotation speed, the adjustment amount of each heat exchange tube 24 can be kept consistent, thereby realizing the function of unified adjustment of multiple heat exchange tubes 24; on the other hand, the contact position of the heat exchange tube 24 with the exhaust gas after rotation changes from the original front contact to the rear contact, so that the heat exchange tube 24 can be in contact with the exhaust gas evenly, which is beneficial to avoiding the wear problem caused by the heat exchange tube 24 using a fixed position for a long time to exchange heat with the exhaust gas. Therefore, the driving member 261 has an easy-to-control adjustment amount and at the same time has the function of adjusting the spacing between the heat exchange tubes 24 and the heat exchange contact surface with the exhaust gas.

[0068] In order to realize the function of individually adjusting the heat exchange contact surface of the heat exchange tube 24, the present invention optimizes the above scheme, specifically: the fixed rack group 2613 also includes two fixed seats 2615, the second rack is slidably installed at one end of the fixed seat 2615, and a return spring 2616 is fixedly installed between the second rack and the fixed seat 2615. An electromagnet 2617 is installed on the inner side of the fixed seat 2615, and the electromagnet 2617 is parallel to the second rack. All electromagnets 2617 are connected to an external controller, and their power on or off is uniformly controlled by the controller.

[0069] When only the heat exchange contact surface of the heat exchange tube 24 needs to be adjusted, the electromagnet 2617 is energized by controlling the electromagnet 2617. After being energized, the electromagnet 2617 generates a magnetic force, which can attract the second rack to shrink into the fixed seat 2615 and simultaneously squeeze the reset spring 2616. When the electromagnet 2617 is in contact with one side of the second rack, the other side of the second rack is completely separated from the transmission gear 2612. At this time, by controlling the movement of the first rack, the transmission gear 2612 can be driven to rotate. Since the transmission gear 2612 loses the meshing action of the second rack, it can only rotate. After the heat exchange tube 24 rotates one hundred and eighty degrees, the first rack stops moving, and the transmission gear 2612 and the heat exchange tube 24 are no longer active. Afterwards, the electromagnet 2617 can be controlled to be de-energized. Under the elastic force of the reset spring 2616, the second rack can be meshed with the transmission gear 2612 again.

[0070] The present invention can realize the automatic retraction function of the second rack by further setting a fixed seat 2615, an electromagnet 2617 and a return spring 2616, so that it can be separated from the transmission gear 2612. When the heat exchange contact surface of the heat exchange tube 24 needs to be adjusted separately, the second rack can be controlled to retract into the fixed seat 2615, so that the transmission gear 2612 can rotate separately. Compared with the above-mentioned method in which the heat exchange contact surface can only be adjusted by adjusting the distance between the heat exchange tubes 24, the heat exchange tube 24 is more flexible in use, which is conducive to meeting actual usage needs.

[0071] In order to provide power for the two adjustment components 26 at the same time, the present invention provides a specific implementation of a power source 25, specifically: the power source 25 includes a driving motor 251, two limit rods 252, two screw rods 253 and a transmission connecting piece, the driving motor 251 is fixedly installed on the outside of the condensation box 22, the two screw rods 253 are symmetrically arranged at the upper and lower ends of the condensation box 22, both ends of the screw rod 253 are rotatably connected to the inner wall of the body 21, and the two ends of the screw rod 253 are respectively threadedly connected to the corresponding connecting plate 2614, the two limit rods 252 are symmetrically arranged at the upper and lower ends of the condensation box 22, both ends of the limit rod 252 are fixedly connected to the inner wall of the body 21, and the two ends of the limit rod 252 are respectively slidably connected to the corresponding connecting plate 2614, the transmission connecting piece is used to connect the driving motor 251 with the two screw rods 253, and the two ends of the screw rod 253 are provided with thread grooves with opposite thread directions. The transmission connection includes a first pulley 254 and two second pulleys 255. The first pulley 254 is fixedly connected to the rotating end of the driving motor 251, and the two second pulleys 255 are correspondingly installed on the ends of the screw rod 253. The two second pulleys 255 are both connected to the first pulley 254 through a transmission belt 256.

[0072] When the power source 25 is in use, the driving motor 251 is driven to rotate, so that the first pulley 254 can simultaneously drive the two second pulleys 255 to rotate, thereby causing the two screw rods 253 to rotate synchronously. Since one end of the connecting plate 2614 is limited by the limiting rod 252, the connecting plate 2614 can rotate with the screw rod 253 and synchronously slide in a straight line along the outer side of the limiting rod 252, thereby driving the two first racks in the driving rack group 2611 to move closer to each other.

[0073] In order to adapt to the linear rolling action of the transmission gear 2612, the present invention provides a specific implementation of a connecting pipe 263, specifically: the connecting pipe 263 includes a connector 2631 and a connecting short pipe 2632, the connector 2631 is fixedly installed on the side of the delivery pipe 27 close to the condenser 22, one end of the connecting short pipe 2632 is fixedly connected to the end of the heat exchange tube 24, and the other end is connected to the connector 2631 through a flexible pipe 2633, the end of the flexible pipe 2633 is rotatably connected to the end of the connecting short pipe 2632, and the flexible pipe 2633 can be a spring hose made of metal; the outer side of the connector 2631 is rotatably installed with two symmetrically distributed rotating Rod 2634, the other end of the rotating rod 2634 is rotatably connected to the outer side of the flexible tube 2633, and the upper and lower ends of the condensation box 22 are provided with a slide groove 2635 corresponding to the connecting short tube 2632, and a first blocking plate 2636 is slidably installed in the slide groove 2635. The first blocking plate 2636 is fixedly connected to the corresponding row of connecting short tubes 2632. The slide groove 2635 serves as a moving path for the connecting short tube 2632, and the first blocking plate 2636 is used to block the slide groove 2635; the delivery pipe 27 is a serpentine pipe, and eleven connectors 2631 are commonly connected to one side of the connector 2631. The serpentine pipe can make the condensing medium flow quickly into the heat exchange tube 24.

[0074] When the connecting pipe 263 is in use, the transmission gear 2612 starts to roll linearly. When the transmission gear 2612 rotates, the connecting short pipe 2632 and the flexible pipe 2633 can be driven to rotate synchronously. Since the connector 2631 is rotatably connected to the flexible pipe 2633, the flexible pipe 2633 will not be affected by the connector 2631, so that the connecting short pipe 2632 can drive the heat exchange pipe 24 to rotate. When the transmission gear 2612 moves linearly, the connecting short pipe 2632 can be driven to move simultaneously. Through the bending of the flexible pipe 2633 and the rotation of the rotating rod 2634, the connecting head 2631 can It adapts to the position change of the connecting short tube 2632 and will not hinder the movement of the connecting short tube 2632. During the linear sliding process of the connecting short tube 2632, it can drive the first sealing plate 2636 to slide in the slide groove 2635. Since the first sealing plate 2636 always blocks the slide groove 2635, it can prevent the exhaust gas from flowing out of the condensation box 22 through the slide groove 2635. Therefore, the connecting pipe fitting 263 provided in the present invention can adapt to the rolling linear action of the transmission gear 2612, will not hinder the movement of the heat exchange tube 24, and can always maintain a stable connection state with the delivery pipe 27, so that the condensing medium can flow normally.

[0075] In order to match the driving member 261, when adjusting the spacing of the heat exchange tubes 24, the cross-sectional area of ​​the exhaust gas passing through the heat exchange zone is synchronously realized, the present invention provides a specific implementation method of a space adjustment member 262, specifically: the space adjustment member 262 includes two movable plates 2621, and the two movable plates 2621 are symmetrically slidably installed at the two ends of the condensation box 22. The upper and lower ends of the condensation box 22 are provided with a clearance groove 2622, and a second sealing plate 2623 is slidably installed in the clearance groove 2622. One end of the second sealing plate 2623 is fixedly connected to one end of the movable plate 2621, and the other end is threadedly connected to the outer side of the screw rod 253. The clearance groove 2622 serves as a moving path of the movable plate 2621, and the second sealing plate 2623 is used to block the clearance groove 2622, and at the same time is used to connect the screw rod 253 and the movable plate 2621 together.

[0076] When the above-mentioned space adjustment member 262 is in use, the screw rod 253 is rotated to drive the two second blocking plates 2623 to slide together synchronously along the give way groove 2622, and the two movable plates 2621 follow the corresponding second blocking plates 2623 to slide together in the condensation box 22. When the heat exchange tube 24 reaches the set adjustment amount, the screw rod 253 stops rotating, and the movable plate 2621 stops moving. At this time, the distance between the two movable plates 2621 is reduced, and the state change of the heat exchange tube 24 is synchronously adapted, so that the cross-sectional length of the exhaust gas passing through the heat exchange zone becomes smaller, which is conducive to promoting the exhaust gas to concentrate in the middle of the heat exchange zone, and can concentrate on contacting the heat exchange tube 24, thereby increasing the contact area with the heat exchange tube 24. Since the distance between the movable plate 2621 and the outermost heat exchange tube 24 is fixed, when the heat exchange tube 24 is tightened, the movable plate 2621 adapts to get closer at the same time, thereby realizing the function of simultaneous adaptation and adjustment of the heat exchange tube 24 and the cross-sectional area of ​​the exhaust gas passing through the heat exchange zone.

[0077] The above describes an embodiment of the present embodiment, but the present embodiment is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the guidance of the present embodiment, ordinary technicians in this field can also make many forms, all of which are within the protection of the present embodiment.

Claims

1. A processing system, characterized in that: include: A pretreatment device, a condensation device, a separation device, a recovery device and a catalytic reaction device connected in sequence, wherein the pretreatment device is used to remove particulate matter in the tail gas, and the separation device is used to separate the components in ethylene. The condensation device includes a body, a condensation box is installed in the body, a condensation medium treatment component is installed on one side of the condensation box, and the input and output ends of the condensation medium treatment component are connected to a delivery pipe, and the two delivery pipes are respectively located at the upper and lower ends of the condensation box. The interior of the condensation box is provided with a plurality of rows of evenly distributed heat exchange tubes, and the upper and lower ends of the heat exchange tubes are connected to the delivery pipe through an adjustment component. A power source is provided in the body, and the power source is connected to the two adjustment components; The regulating component includes a driving member, a space regulating member and a plurality of connecting pipes, wherein the plurality of connecting pipes are connected to the ends of the heat exchange tubes correspondingly, and the plurality of connecting pipes are connected to the driving member together. The space regulating member is connected to the driving member and is used to adjust the cross-sectional area of ​​the exhaust gas passing through the condensing box. The driving member is used to drive the corresponding rows of the heat exchange tubes to rotate and approach each other, and at the same time drive the space regulating member to perform an adaptive regulating action. The connecting pipe has the ability to adapt to the movement of the heat exchange tubes. The power source includes a driving motor, two limit rods, two screw rods and a transmission connection piece, wherein the driving motor is fixedly mounted on the outside of the condensing box, the two screw rods are symmetrically arranged at the upper and lower ends of the condensing box, both ends of the screw rods are rotatably connected to the inner wall of the machine body, and the two ends of the screw rods are respectively threadedly connected to the corresponding connecting plates, the two limit rods are symmetrically arranged at the upper and lower ends of the condensing box, both ends of the limit rods are fixedly connected to the inner wall of the machine body, and the two ends of the limit rods are respectively slidably connected to the corresponding connecting plates, and the transmission connection piece is used to connect the driving motor with the two screw rods; The space adjustment member includes two movable plates, which are symmetrically slidably installed at the two ends of the condensation box. The upper and lower ends of the condensation box are provided with clearance grooves, and a second sealing plate is slidably installed in the clearance groove. One end of the second sealing plate is fixedly connected to one end of the movable plate, and the other end is threadedly connected to the outer side of the screw rod.

2. A processing system according to claim 1, characterized in that: The driving member includes a plurality of driving rack groups, a plurality of transmission gears and a plurality of fixed rack groups. The plurality of transmission gears are fixedly sleeved on one end of the connecting pipe member, and the plurality of driving rack groups are connected with the transmission gears of the corresponding row. The driving rack group includes two first racks, which are slidably mounted on the outside of the condensation box. The first racks are meshed with the transmission gears of the corresponding row, and the ends of the first racks located at the same end are commonly connected with a connecting plate. The plurality of fixed rack groups are connected with the transmission gears of the corresponding row. The fixed rack group includes two second racks, which are meshed with the transmission gears of the corresponding row, and the second racks are arranged on the outside of the condensation box.

3. A processing system according to claim 2, characterized in that: The fixed rack group also includes two fixed seats, the second rack is slidably mounted on one end of the fixed seat, a return spring is fixedly mounted between the second rack and the fixed seat, an electromagnet is mounted on the inner side of the fixed seat, and the electromagnet is parallel to the second rack.

4. A processing system according to claim 3, characterized in that: The transmission connection member includes a first pulley and two second pulleys, the first pulley is fixedly connected to the rotating end of the drive motor, and the two second pulleys are correspondingly installed on the ends of the screw rod, and the two second pulleys are both connected to the first pulley through a transmission belt.

5. A processing system according to claim 4, characterized in that: The connecting pipe fitting includes a connecting head and a connecting short pipe, the connecting head is fixedly installed on a side of the delivery pipe close to the condensation tank, one end of the connecting short pipe is fixedly connected to the end of the heat exchange tube, and the other end is connected to the connecting head through a flexible pipe, the end of the flexible pipe is rotatably connected to the end of the connecting short pipe, a rotating rod is rotatably installed on the outer side of the connecting head, and the other end of the rotating rod is rotatably connected to the outer side of the flexible pipe, and the upper and lower ends of the condensation tank are provided with sliding grooves corresponding to the connecting short pipes, and a first sealing plate is slidably installed in the sliding groove, and the first sealing plate is fixedly connected to the corresponding row of the connecting short pipes.

6. A processing system according to claim 5, characterized in that: The flexible tube is a spring hose made of metal material. The number of the rotating rods is two, and the two rotating rods are symmetrically distributed on both sides of the connecting head.

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