Dimethyl ether separation tower condensation purge gas absorption treatment device and method

Abstract

The invention relates to the technical field of dimethyl ether recovery, in particular to a dimethyl ether separation tower condensation purge gas absorption treatment device and method.The dimethyl ether separation tower condensation purge gas absorption treatment device specifically comprises a treatment tank, a partition plate is fixedly connected to the interior of the treatment tank, and an alternate absorption assembly for treating purge gas is arranged above the partition plate; an impurity removal assembly which is linked with the alternate absorption assembly and is used for carrying out impurity removal and pre-absorption on the gas is arranged outside the treatment tank; according to the invention, the alternate absorption assembly is combined with the impurity removal assembly, so that the continuous impurity removal and multi-stage absorption treatment of the purge gas can be realized on the basis of non-stop injection of the purge gas and non-stop of the device, the utilization rate of an absorbent is improved, and the overall recovery and absorption efficiency of dimethyl ether is further improved in an auxiliary manner; in addition, residual gas in the replaced impurity removal barrel can be pushed into the treatment tank, and the problems that part of dimethyl ether is difficult to recycle effectively due to leakage of purge gas when the filter screen is cleaned and the environment is polluted due to leakage of the purge gas are avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of dimethyl ether recovery, and particularly to a device and method for absorbing and treating the condensation and purge gas of a dimethyl ether separation tower. Background Art

[0002] As an important basic organic chemical raw material, dimethyl ether occupies a key position in the chemical industry. Due to its low boiling point, a considerable proportion of dimethyl ether remains in the dimethyl ether tail gas discharged from the reflux drum top of the separation tower.

[0003] Currently, for this part of the purge gas, the common treatment method in industrial production is to pass it through a tail gas heater and then merge it into the gas pipeline network for direct combustion. However, this treatment method has obvious drawbacks. On the one hand, it will cause waste of dimethyl ether resources, and on the other hand, it will increase the carbon dioxide emissions, having an adverse impact on the environment.

[0004] In traditional purge gas treatment methods, absorption method, adsorption method, membrane separation method, etc. are relatively commonly used technical means. Among them, the absorption method has been widely used in industrial production due to its significant advantages such as high selectivity, low cost, and simple operation.

[0005] Currently, the basic working principle of absorbing dimethyl ether from purge gas is to introduce the purge gas into the absorbent, and the absorbent absorbs the dimethyl ether in it. Although the effective recovery of dimethyl ether can be achieved, in actual use, when the absorption efficiency of the absorbent decreases, due to the limitations in the device design, it is difficult to quickly replace the absorbent without stopping the gas supply. This leads to a long downtime for absorbent replacement during the production process, greatly increasing the production interruption time, and thus reducing the overall recovery efficiency of dimethyl ether.

[0006] Among them, for production devices using a direct gas supply system, during the long-term gas supply interruption, when the gas supply is restored, the stage air flow velocity will increase sharply, making it difficult to fully recover and treat the previously accumulated purge gas, further reducing the overall recovery quality of dimethyl ether.

[0007] In addition, during the process of discharging and replacing the absorbent, the remaining low-efficiency absorption capacity in the absorbent cannot be fully utilized, resulting in difficulty in further improving the overall absorption treatment efficiency, reducing the utilization rate of the absorbent, and causing secondary waste of resources. Summary of the Invention

[0008] The object of the present invention is to provide a dimethyl ether separation tower condensation purge gas absorption treatment device and method, aiming to realize continuous impurity removal and multi-stage absorption treatment of the purge gas on the basis of continuous gas injection and non-stop operation of the device through the design of an alternating absorption component combined with an impurity removal component, improve the utilization rate of the absorbent, further assist in improving the overall recovery and absorption efficiency of dimethyl ether, and reduce the environmental pollution caused by the leakage of the purge gas, so as to solve the above-mentioned technical defects.

[0009] The object of the present invention can be achieved by the following technical solutions: A dimethyl ether separation tower condensation purge gas absorption treatment device, including a treatment tank, wherein a partition plate is fixedly connected inside the treatment tank, and an alternating absorption component for treating the purge gas is arranged above the partition plate, and an impurity removal component which is linked with the alternating absorption component and pre-absorbs impurities from the gas is arranged outside the treatment tank;

[0010] The alternating absorption component includes a rotating seat rotatably installed on the top of the partition plate, and two treatment chambers are opened on the top of the rotating seat, and a watering tray matched with the treatment chambers is fixedly installed at the bottom of the partition plate;

[0011] The impurity removal component includes a sealed mounting ring rotatably connected to the annular outer wall of the treatment tank, impurity removal cylinders are symmetrically and fixedly connected to both sides of the sealed mounting ring, and a filter screen is installed inside the impurity removal cylinders, and an air inlet seat is fixedly connected inside the treatment tank and below the partition plate.

[0012] Preferably, a hollow tube rotatably connected to the treatment tank is fixedly connected to the top of the rotating seat, and a waste gas pipe is connected to the top of the hollow tube through a rotary joint. First air holes communicating with the treatment tank are opened on the inner wall of the hollow tube, and a bracket is connected between the hollow tube and the sealed mounting ring.

[0013] Preferably, a first liquid discharge port is penetrated and opened at the bottom of the treatment chamber, and an air outlet pipe for dispersedly discharging the purge gas is fixedly communicated. Second liquid discharge ports and second air holes are respectively penetrated on both sides of the partition plate, and a control valve is installed in the second liquid discharge port.

[0014] Preferably, a blocking block which is hermetically slid with the rotating seat is fixedly connected to the top inside the treatment tank above the second liquid discharge port, and a liquid injection pipe is connected to the blocking block.

[0015] Preferably, the air inlet seat includes an upper arc-shaped baffle plate, and a lower arc-shaped sealing plate fixedly connected to the concave side of the upper arc-shaped baffle plate. A plurality of dispersion holes are equidistantly opened on both sides of the lower arc-shaped sealing plate. The second liquid discharge port communicates with the watering tray. A third air hole communicating with the air inlet seat is opened on the treatment tank, and a fourth air hole is opened above the filter screen on the impurity removal cylinder.

[0016] Preferably, an auxiliary cylinder is fixedly connected to the sealing mounting ring and on one side corresponding to the impurity removal cylinder. A first connecting pipe is fixedly connected between the auxiliary cylinder and the impurity removal cylinder and below the filter screen. An air inlet hole is opened at the bottom of the auxiliary cylinder.

[0017] Preferably, a first piston and a second piston are respectively slidably connected inside the auxiliary cylinder and the impurity removal cylinder. A spring is fixedly connected between the top of the first piston and the auxiliary cylinder. A second connecting pipe is fixedly connected between the tops of the auxiliary cylinder and the impurity removal cylinder.

[0018] Preferably, an air inlet ring rotatably connected to the sealing mounting ring is fixedly connected to the treatment tank. An arc-shaped air inlet cavity matching the air inlet hole is opened at the top of the air inlet ring. An injection pipe communicating with the arc-shaped air inlet cavity is connected to the air inlet ring. A fifth air hole matching the fourth air hole is opened on the treatment tank.

[0019] Preferably, an arc-shaped blocking plate that is hermetically slidable with the auxiliary cylinder is fixedly connected to the bottom of the first piston. A communication port is opened on the arc-shaped blocking plate. The end of the arc-shaped blocking plate penetrates to the outside of the bottom of the auxiliary cylinder and is fixedly connected to a cross bar. A trapezoidal guiding block is fixedly connected to one side of the bottom of the air inlet ring.

[0020] The present invention also proposes a method for absorbing and treating the condensate and blowdown gas of a dimethyl ether separation tower, which is realized by using the above-mentioned device for absorbing and treating the condensate and blowdown gas of a dimethyl ether separation tower, and includes the following contents: an impurity removal type air inlet recovery and absorption link, an exchange type impurity removal and absorption process, an air inlet type residual gas discharge method, and a liquid discharge type pre-absorption treatment.

[0021] The beneficial effects of the present invention are as follows:

[0022] (1) In the present invention, the rotation of the rotating seat and the sealing mounting ring enables the two treatment chambers and the impurity removal cylinder to be used alternately. When the absorption efficiency of the absorbent in one treatment chamber decreases, it can be quickly switched to the other treatment chamber to continue working without stopping the machine, avoiding production interruption caused by spending a long time replacing the absorbent, greatly improving production efficiency, and ensuring the continuity and stability of the dimethyl ether separation tower condensate and blowdown gas treatment process;

[0023] And during the process of discharging and replacing the absorbent containing dimethyl ether in the dimethyl ether recovery process, combined with the decentralized discharge of the blowdown gas and the absorbent, pre-absorption treatment can be carried out on the blowdown gas before absorption treatment, realizing impurity removal and multi-stage absorption treatment of the blowdown gas, improving the utilization rate of the absorbent, and further assisting in improving the overall recovery and absorption efficiency of dimethyl ether;

[0024] (2) The present invention also sets up two sets of impurity removal cylinders, enabling the cleaning of the corresponding filter screens to be carried out synchronously during the dimethyl ether recovery process, so as to avoid the need to stop the machine for cleaning due to excessive impurities on the filter screens, which affects the treatment efficiency of the purge gas. In addition, during the process of driving the impurity removal cylinders to be used alternately by the rotation of the sealed mounting ring, combined with the setting of the auxiliary cylinder, the pause time for the purge gas to stop injection during the exchange process can be maximally achieved to ensure the stability of the gas injection system. And by continuously injecting gas into the auxiliary cylinder, the residual gas in the impurity removal cylinder is pushed into the treatment tank, avoiding the leakage of the purge gas when cleaning the filter screen, resulting in the difficulty of effectively recovering some dimethyl ether and the environmental pollution caused by the leakage of the purge gas, which conforms to the production concept of energy conservation and environmental protection. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The present invention will be further described below in conjunction with the drawings;

[0026] Figure 1 is a schematic structural diagram of the present invention;

[0027] Figure 2 is a schematic structural diagram of another perspective of the present invention;

[0028] Figure 3 is a schematic structural diagram of the interior of the treatment tank of the present invention;

[0029] Figure 4 is a schematic structural diagram of the treatment tank of the present invention Figure 1 ;

[0030] Figure 5 is a schematic structural diagram of the treatment tank of the present invention Figure 2 ;

[0031] Figure 6 is a schematic structural diagram of the air inlet ring of the present invention;

[0032] Figure 7 is a schematic structural diagram of the alternating absorption assembly of the present invention;

[0033] Figure 8 is a schematic structural diagram of the impurity removal assembly of the present invention;

[0034] Figure 9 is a schematic diagram of the cooperation between the impurity removal cylinder and the auxiliary cylinder of the present invention;

[0035] Figure 10 is a schematic structural diagram of the arc-shaped plug plate of the present invention.

[0036] Legend Explanation:

[0037] 1. Treatment tank; 11. Partition plate; 12. Sprinkler tray; 13. Second drain port; 14. Second air hole; 15. Air inlet ring; 16. Arc-shaped air inlet cavity; 17. Injection pipe; 18. Fifth air hole; 19. Trapezoidal guide block

[0038] 2. Alternating absorption assembly; 21. Rotating seat; 22. Processing chamber; 23. Bracket; 24. First liquid discharge port; 25. Air outlet pipe;

[0039] 3. De-impurity assembly; 31. Sealing mounting ring; 32. De-impurity cylinder; 33. Filter screen; 34. Air inlet seat; 35. Third air hole; 36. Fourth air hole; 37. Auxiliary cylinder; 38. First connecting pipe; 39. Air inlet hole; 310. First piston; 311. Second piston; 312. Second connecting pipe; 313. Arc blocking plate; 314. Connecting port; 315. Cross bar. DETAILED DESCRIPTION

[0040] 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.

[0041] Example 1: Please refer to Figures 1 - 5 and Figure 9 As shown, the problem in the prior art that it is difficult to continuously remove impurities and absorb the purge gas without stopping the gas injection and the device can be solved by the following scheme:

[0042] A dimethyl ether separation tower condensation purge gas absorption treatment device in this embodiment includes a treatment tank 1, a partition plate 11 is fixedly connected to the inside of the treatment tank 1, and the partition plate 11 is used to divide the inside of the treatment tank 1 for treatment, and the upper and lower parts are respectively used for secondary absorption treatment and primary pre-absorption treatment of the purge gas, and an alternating absorption component 2 for treating the purge gas is arranged above the partition plate 11, and an impurity removal component 3 is arranged outside the treatment tank 1 to be linked with the alternating absorption component 2 to remove impurities and pre-absorb the gas;

[0043] The alternating absorption assembly 2 includes a rotating seat 21 rotatably mounted on the top of the partition plate 11, and two groups of processing chambers 22 are opened on the top of the rotating seat 21. The rotation of the rotating seat 21 realizes the efficient alternating use of the two groups of processing chambers 22. When the absorption efficiency of the absorbent in one group of processing chambers 22 decreases, it can be quickly switched to another group without stopping the machine and stopping the gas, which greatly shortens the production interruption time caused by replacing the absorbent, ensures the continuity and stability of the dimethyl ether separation tower condensation and purge gas treatment process, and effectively improves the overall production efficiency;

[0044] A water sprinkling tray 12 matched with the treatment chamber 22 is fixedly installed at the bottom of the partition plate 11. The absorbent containing dimethyl ether is discharged to the water sprinkling tray 12, and the absorbent is dispersed through the water sprinkling tray 12, so as to promote its contact with the first-dispersed purge gas, perform pre-absorption treatment on the purge gas, thereby improving the overall dimethyl ether recovery and absorption efficiency, making full use of the absorbent, improving the utilization rate of the absorbent, and reducing the problem of waste;

[0045] The impurity removal assembly 3 includes a sealed mounting ring 31 rotatably connected to the annular outer wall of the treatment tank 1. Impurity removal cylinders 32 are symmetrically and fixedly connected to both sides of the sealed mounting ring 31, and a filter screen 33 is installed inside the impurity removal cylinder 32. Through the provided impurity removal cylinder 32 and the filter screen 33 inside, it is used to filter the impurities in the purge gas, thereby improving the quality of dimethyl ether recovery. A sealing cover is provided at the bottom of the impurity removal cylinder 32 for cleaning the filter screen 33. An air inlet seat 34 is fixedly connected inside the treatment tank 1 and below the partition plate 11.

[0046] The top of the rotating seat 21 is fixedly connected with a hollow tube rotatably connected to the treatment tank 1, and the top of the hollow tube is connected to an exhaust pipe through a rotary joint. The inner wall of the hollow tube is provided with a first air hole communicating with the treatment tank 1. The dimethyl ether in the purge gas is recovered and absorbed by the absorbent in the treatment chamber 22, and the remaining waste gas is discharged from the absorbent and discharged through the first air hole on the hollow tube, the rotary joint and the exhaust pipe;

[0047] A bracket 23 is connected between the hollow tube and the sealed mounting ring 31 to promote the synchronous rotation of the rotating seat 21 and the sealed mounting ring 31. The top of the treatment tank 1 is installed with a servo motor through bolts, and a first gear is fixedly connected to the output shaft of the servo motor. A second gear meshing with the first gear is fixedly connected to the hollow tube.

[0048] A first drain port 24 is penetrated and opened at the bottom of the treatment chamber 22, and an air outlet pipe 25 for dispersedly discharging the purge gas is fixedly communicated. The air outlet pipe 25 includes a U-shaped section and an arc section at the free end of the U-shaped section. The U-shaped section prevents the purge gas from flowing back to the lower part of the partition plate 11 through the air outlet pipe 25. A plurality of holes are opened on the arc section for dispersedly spraying the purge gas at the bottom of the absorbent. Second drain ports 13 and second air holes 14 are respectively penetrated and opened on both sides of the partition plate 11, and a control valve is installed in the second drain port 13;

[0049] A liquid collecting cylinder is fixedly connected to the bottom of the treatment tank 1, and a first drain pipe communicating with the liquid collecting cylinder is fixedly connected to the bottom of the treatment tank 1. A second drain pipe is fixedly communicated with the bottom of the liquid collecting cylinder, and control valves are installed on both the first drain pipe and the second drain pipe;

[0050] After the positions of the two groups of treatment chambers 22 are swapped, the absorbent containing dimethyl ether is discharged through the opening of the control valve in the second drain port 13 to the sprinkler tray 12, prompting it to come into contact with the first-dispersed purge gas and performing pre-absorption treatment on the purge gas. By opening the control valve on the first drain pipe, the absorbent enters the liquid collection cylinder for collection. After the liquid collection cylinder is filled, the control valve on the first drain pipe is closed, and the treatment tank 1 temporarily collects it. Then, the control valve on the second drain pipe is opened for the recovery and collection of the absorbent.

[0051] A block that is fixedly connected above the second drain port 13 at the top inside the treatment tank 1 and is in sealed sliding connection with the rotating seat 21 is used to block and seal one group of treatment chambers 22, preventing some waste gas from recombining with the purge gas during the process of replacing the absorbent. A liquid injection pipe is connected to the block for adding absorbent into the treatment chamber 22.

[0052] The air inlet seat 34 includes an upper arc-shaped baffle and a lower arc-shaped sealing plate fixedly connected to the concave side of the upper arc-shaped baffle. A plurality of dispersion holes are equidistantly arranged on both sides of the lower arc-shaped sealing plate. The second drain port 13 is communicated with the sprinkler tray 12. A third air hole 35 communicated with the air inlet seat 34 is opened on the treatment tank 1. A fourth air hole 36 is opened above the filter screen 33 on the impurity removal cylinder 32. When the third air hole 35 is communicated with the fourth air hole 36, the injection of the purge gas into the interior of the treatment tank 1 is realized.

[0053] Example 2: Please refer to Figures 6 - 10 As shown, for the problem of the leakage of the purge gas inside the impurity removal cylinder during the cleaning process of the filter screen, the following solution can be adopted;

[0054] The air inlet seat 34 in this embodiment includes an upper arc-shaped baffle and a lower arc-shaped sealing plate fixedly connected to the concave side of the upper arc-shaped baffle. A plurality of dispersion holes are equidistantly arranged on both sides of the lower arc-shaped sealing plate. Through the cooperation of the upper arc-shaped baffle, the lower arc-shaped sealing plate and the dispersion holes, not only can the first dispersion treatment of the purge gas be carried out, but also the absorbent containing dimethyl ether can be prevented from entering the interior of the air outlet seat when it is discharged. The second drain port 13 is communicated with the sprinkler tray 12. A third air hole 35 communicated with the air inlet seat 34 is opened on the treatment tank 1. A fourth air hole 36 is opened above the filter screen 33 on the impurity removal cylinder 32.

[0055] An auxiliary cylinder 37 is fixedly connected to the sealing mounting ring 31 on the side corresponding to the impurity removal cylinder 32. The provided auxiliary cylinder 37 is used to push the residual gas in the impurity removal cylinder 32 into the treatment tank 1, avoiding the leakage of the purge gas when the filter screen 33 is cleaned, and further realizing the relatively continuous non-stop gas supply treatment of the direct gas supply system;

[0056] A first connecting pipe 38 is fixedly connected between the auxiliary cylinder 37 and the impurity removing cylinder 32 and is located below the filter screen 33. An air inlet hole 39 is opened at the bottom of the auxiliary cylinder 37. The released gas enters the auxiliary cylinder 37 through the air inlet hole 39, then enters the impurity removing cylinder 32 through the communication port 314 and the first connecting pipe 38. The impurities in the released gas are filtered by the filter screen 33, and then enter the air inlet seat 34 through the fourth air hole 36 and the third air hole 35, and are subjected to the first dispersion treatment through the plurality of dispersion holes on the air inlet seat 34.

[0057] A first piston 310 and a second piston 311 are respectively slidably connected inside the auxiliary cylinder 37 and the impurity removing cylinder 32. A spring is fixedly connected between the top of the first piston 310 and the auxiliary cylinder 37 for resetting the initial positions of the first piston 310 and the second piston 311. A second connecting pipe 312 is fixedly connected between the tops of the auxiliary cylinder 37 and the impurity removing cylinder 32;

[0058] The released gas continuously enters the auxiliary cylinder 37 and enters the impurity removing cylinder 32 through the first connecting pipe 38. Combined with the blocking of the fourth air hole 36, the released gas in the auxiliary cylinder 37 and the impurity removing cylinder 32 cannot be discharged, and then the first piston 310 is pushed to rise and compress the spring. The air above the first piston 310 in the auxiliary cylinder 37 is injected into the area above the second piston 311 in the impurity removing cylinder 32 through the second connecting pipe 312, causing the second piston 311 to move downward.

[0059] An air inlet ring 15 rotatably connected to the sealing mounting ring 31 is fixedly connected to the treatment tank 1. An arc-shaped air inlet cavity 16 matching the air inlet hole 39 is opened at the top of the air inlet ring 15. The third air hole 35 and the corresponding fourth air hole 36 are separated first, and the air inlet hole 39 slides on the top of the arc-shaped air inlet cavity 16, and the released gas in the injection pipe 17 can continuously enter the auxiliary cylinder 37;

[0060] The air inlet ring 15 is connected with an injection pipe 17 communicating with the arc-shaped air inlet cavity 16. A fifth air hole 18 matching the fourth air hole 36 is opened on the treatment tank 1. The fourth air hole 36 communicates with the fifth air hole 18. Due to the relatively high air pressure of the released gas in the auxiliary cylinder 37, the first piston 310 and the second piston 311 are continuously moved, and the remaining released gas in the impurity removing cylinder 32 is pushed into the treatment tank 1, so as to avoid the leakage of the released gas when cleaning the filter screen 33.

[0061] An arc-shaped blocking plate 313 that is hermetically slidable with the auxiliary cylinder 37 is fixedly connected to the bottom of the first piston 310. A communication port 314 is opened on the arc-shaped blocking plate 313. The first piston 310 drives the arc-shaped blocking plate 313 to move, causing the communication port 314 to separate from the first connecting pipe 38. The released gas in the auxiliary cylinder 37 no longer enters the impurity removing cylinder 32. Then, the released gas in the auxiliary cylinder 37 continuously increases, pushing the first piston 310 to rise and the second piston 311 to move downward;

[0062] The end of the arc-shaped blocking plate 313 penetrates to the outside of the bottom of the auxiliary cylinder 37 and is fixedly connected with a cross bar 315. One side of the bottom of the air inlet ring 15 is fixedly connected with a trapezoidal guiding block 19. Through the contact between the cross bar 315 on the auxiliary cylinder 37 and the trapezoidal guiding block 19, the trapezoidal guiding block 19 guides the cross bar 315, prompting the arc-shaped blocking plate 313 to pull the first piston 310 downward to forcibly compress the relief gas in the auxiliary cylinder 37, completing the connection between the communication port 314 and the first connecting pipe 38, and then smoothly injecting the relief gas into the treatment tank 1.

[0063] Embodiment 3: Please refer to Figures 1 - 10 As shown in the figure, the present invention also proposes a method for absorbing and treating the condensate relief gas of a dimethyl ether separation tower, which is realized by using the above-mentioned device for absorbing and treating the condensate relief gas of a dimethyl ether separation tower, and includes the following contents:

[0064] Step 1: The impurity removal type air intake recovery and absorption link, including the following steps: Inject the condensate relief gas of the dimethyl ether separation tower into the arc-shaped air intake cavity 16 through the injection pipe 17, and enter one of the auxiliary cylinders 37 through the air intake holes 39 communicated with the arc-shaped air intake cavity 16. Then enter the impurity removal cylinder 32 through the communication port 314 and the first connecting pipe 38. Filter the impurities in the relief gas through the filter screen 33, and then enter the air intake seat 34 through the fourth air holes 36 and the third air holes 35, and perform the first dispersion treatment through the multiple dispersion holes on the air intake seat 34;

[0065] The relief gas after the first dispersion enters the U-shaped section of the air outlet pipe 25 through the second air holes 14, and then is dispersed and discharged to the corresponding treatment cavity 22 through the multiple holes on the arc section. Recover and absorb the dimethyl ether in the secondarily dispersed relief gas through the absorbent in the treatment cavity 22, and the remaining waste gas is discharged from the absorbent and discharged through the first air holes on the hollow pipe, the rotary joint and the waste gas pipe;

[0066] Step 2: The exchange type impurity removal and absorption process, including the following steps: After the absorption efficiency of the absorbent in the current treatment cavity 22 decreases, the servo motor starts and drives the rotating seat 21 and the sealing mounting ring 31 to rotate 180° through the first gear, the second gear, the hollow pipe and the bracket 23 for rapid exchange without stopping the gas, so that the air outlet pipe 25 in another treatment cavity 22 is communicated with the second air holes 14, and the fourth air holes 36 and the third air holes 35 on another impurity removal cylinder 32 are communicated;

[0067] Step 3: Intake-type residual gas discharge method, including the following steps: During the rotation of the sealed mounting ring 31, the third air hole 35 and the corresponding fourth air hole 36 are first separated, and the continuous injection of purge gas into the interior of the treatment tank 1 stops. The intake hole 39 slides on the top of the arc-shaped intake chamber 16, and the purge gas in the injection pipe 17 can continuously enter the auxiliary cylinder 37 and enter the impurity removal cylinder 32 through the first connecting pipe 38. Combining with the blockage of the fourth air hole 36, the purge gas in the auxiliary cylinder 37 and the impurity removal cylinder 32 cannot be discharged, thereby pushing the first piston 310 to rise and compress the spring;

[0068] Through the upward movement of the first piston 310, the air in the auxiliary cylinder 37 above it is injected into the area above the second piston 311 in the impurity removal cylinder 32 through the second connecting pipe 312. The first piston 310 drives the arc-shaped blocking plate 313 to move, causing the communication port 314 to separate from the first connecting pipe 38, and the purge gas in the auxiliary cylinder 37 no longer enters the impurity removal cylinder 32. The purge gas in the auxiliary cylinder 37 continues to increase, pushing the first piston 310 to rise and the second piston 311 to descend;

[0069] After the intake hole 39 separates from the arc-shaped intake chamber 16, the fourth air hole 36 communicates with the fifth air hole 18. Due to the relatively high air pressure of the purge gas in the auxiliary cylinder 37, the first piston 310 and the second piston 311 are forced to move continuously, pushing the residual purge gas in the impurity removal cylinder 32 into the treatment tank 1. Then, with the rotation of the sealed mounting ring 31, the fourth air hole 36 on another group of impurity removal cylinders 32 communicates with the third air hole 35, and the intake hole 39 on another group of auxiliary cylinders 37 communicates with the arc-shaped intake chamber 16, and they are used alternately to achieve non-stop injection treatment and linkage to discharge the residual gas in the impurity removal cylinder 32. That is, while recovering and absorbing dimethyl ether, the impurities on the filter screen 33 in the previous impurity removal cylinder 32 are cleaned;

[0070] During the process of the sealed mounting ring 31 rotating another 180°, the cross bar 315 on the auxiliary cylinder 37 contacts the trapezoidal guiding block 19. Through the guiding of the trapezoidal guiding block 19 on the cross bar 315, the arc-shaped blocking plate 313 pulls the first piston 310 to move downward, forcibly compressing the purge gas in the auxiliary cylinder 37, completing the connection between the communication port 314 and the first connecting pipe 38, and then smoothly injecting the purge gas into the treatment tank 1;

[0071] Step 4: Drainage pre-absorption treatment, including the following steps: After the two treatment chambers 22 complete the position swapping, the absorbent containing dimethyl ether is discharged through the opening of the control valve in the second drain port 13 to the sprinkler tray 12. The absorbent is dispersed by the sprinkler tray 12 to promote its contact with the first-dispersed purge gas, and the purge gas is pre-absorbed, thereby improving the overall dimethyl ether recovery and absorption efficiency. By opening the control valve on the first drain pipe, the absorbent enters the liquid collection cylinder for collection. After the liquid collection cylinder is full, the control valve on the first drain pipe is closed, and the treatment tank 1 temporarily collects it. Then, the control valve on the second drain pipe is opened for the recovery and collection of the absorbent.

[0072] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution and inventive concept of the present invention, making equivalent substitutions or changes, should be covered by the protection scope of the present invention.

Claims

1. A dimethyl ether separation tower condensation blowdown gas absorption treatment device, comprising a treatment tank (1), characterized in that, A partition plate (11) is fixedly connected inside the treatment tank (1), and an alternating absorption assembly (2) for treating the relief gas is arranged above the partition plate (11). An impurity removal assembly (3) is arranged outside the treatment tank (1) and is linked with the alternating absorption assembly (2) to pre-absorb impurities from the gas. The alternating absorption assembly (2) includes a rotating seat (21) rotatably mounted on the top of the partition plate (11). Two treatment chambers (22) are opened on the top of the rotating seat (21). A water sprinkling tray (12) matched with the treatment chamber (22) is fixedly installed at the bottom of the partition plate (11). The impurity removal assembly (3) includes a sealed mounting ring (31) rotatably connected to the outer circumferential wall of the treatment tank (1). Impurity removal cylinders (32) are symmetrically and fixedly connected to both sides of the sealed mounting ring (31). A filter screen (33) is installed inside the impurity removal cylinder (32). An air inlet seat (34) is fixedly connected inside the treatment tank (1) and below the partition plate (11).

2. The dimethyl ether separation tower condensation purge gas absorption and treatment device according to claim 1, wherein The top of the rotating seat (21) is fixedly connected with a hollow pipe rotatably connected to the treatment tank (1). The top of the hollow pipe is connected with an exhaust pipe through a rotary joint. First air holes communicating with the treatment tank (1) are opened on the inner wall of the hollow pipe. A bracket (23) is connected between the hollow pipe and the sealed mounting ring (31).

3. The dimethyl ether separation tower condensation purge gas absorption and treatment device according to claim 1, characterized in that, A first liquid discharge port (24) is opened through the bottom of the treatment chamber (22), and an air outlet pipe (25) for dispersedly discharging the relief gas is fixedly communicated. Second liquid discharge ports (13) and second air holes (14) are respectively opened through both sides of the partition plate (11). A control valve is installed in the second liquid discharge port (13).

4. A dimethyl ether separation tower condensation purge gas absorption treatment device according to claim 1, characterized in that, A blocking block in sealed sliding connection with the rotating seat (21) is fixedly connected to the top inside the treatment tank (1) above the second liquid discharge port (13), and a liquid injection pipe is connected to the blocking block.

5. The dimethyl ether separation tower condensation purge gas absorption treatment device according to claim 3, characterized in that, The air inlet seat (34) includes an upper arc-shaped baffle and a lower arc-shaped sealing plate fixedly connected to the concave side of the upper arc-shaped baffle. A plurality of dispersion holes are equidistantly opened on both sides of the lower arc-shaped sealing plate. The second liquid discharge port (13) communicates with the water sprinkling tray (12). A third air hole (35) communicating with the air inlet seat (34) is opened on the treatment tank (1). A fourth air hole (36) is opened above the filter screen (33) on the impurity removal cylinder (32).

6. The dimethyl ether separation tower condensation purge gas absorption treatment device according to claim 1, characterized in that, An auxiliary cylinder (37) is fixedly connected to the sealed mounting ring (31) on the side corresponding to the impurity removal cylinder (32). A first connecting pipe (38) is fixedly communicated between the auxiliary cylinder (37) and the impurity removal cylinder (32) and below the filter screen (33). An air inlet hole (39) is opened at the bottom of the auxiliary cylinder (37).

7. The dimethyl ether separation tower condensation purge gas absorption treatment device according to claim 6, characterized in that, A first piston (310) and a second piston (311) are respectively slidably connected inside the auxiliary cylinder (37) and the impurity removal cylinder (32). A spring is fixedly connected between the top of the first piston (310) and the auxiliary cylinder (37). A second connecting pipe (312) is fixedly communicated between the tops of the auxiliary cylinder (37) and the impurity removal cylinder (32).

8. A dimethyl ether separation column condensate blowdown gas absorption and treatment device according to claim 7, characterized in that, An air inlet ring (15) rotatably connected to a sealing mounting ring (31) is fixedly connected to the treatment tank (1). An arc-shaped air inlet cavity (16) matching an air inlet hole (39) is formed at the top of the air inlet ring (15). An air injection pipe (17) communicated with the arc-shaped air inlet cavity (16) is connected to the air inlet ring (15). A fifth air hole (18) matching a fourth air hole (36) is formed in the treatment tank (1).

9. A dimethyl ether separation column condensate purge gas absorption treatment device according to claim 8, characterized in that, An arc-shaped plugging plate (313) hermetically sliding with an auxiliary cylinder (37) is fixedly connected to the bottom of the first piston (310). A communication port (314) is formed in the arc-shaped plugging plate (313). The end of the arc-shaped plugging plate (313) penetrates to the outside of the bottom of the auxiliary cylinder (37) and is fixedly connected to a cross bar (315). A trapezoidal guiding block (19) is fixedly connected to one side of the bottom of the air inlet ring (15).

10. A method for absorbing and treating the condensate and purge gas of a dimethyl ether separation column is realized by using a device for absorbing and treating the condensate and purge gas of a dimethyl ether separation column as described in any one of claims 1-9, characterized in that, It includes the following: impurity removal type air inlet recovery and absorption link, exchange type impurity removal and absorption process, air inlet type residual gas discharge method, and liquid discharge type pre-absorption treatment.

Images