A continuous rectification column tail gas purification system

Abstract

The application discloses a continuous rectification tower tail gas purification system and relates to the technical field of rectification tower tail gas treatment. The continuous rectification tower tail gas purification system comprises a rectification tower body, a tail gas output end arranged at the top of the rectification tower body, a feeding end arranged at the outer side of the rectification tower body, a pressurizing heat exchange assembly, a reaction purification assembly and the like. The pressurizing heat exchange assembly comprises a tail gas pressurizer and a feeding preheater. The tail gas output end is communicated with the input end of the feeding preheater through the tail gas pressurizer. The input end of the feeding preheater is communicated with a feeding piece. The output end of the feeding preheater is communicated with the feeding end. The reaction purification assembly comprises a pressurized reaction kettle, a gas-liquid separator and a gas on-line analyzer. The pressurized reaction kettle is communicated with the output end of the feeding preheater. The pressurized reaction kettle is communicated with a dosing piece and has a purified gas outlet. The purified gas outlet is communicated with the gas-liquid separator. The gas outlet of the gas-liquid separator is communicated with the gas on-line analyzer. The continuous rectification tower tail gas purification system can utilize tail gas waste heat for rectification and tail gas circulation purification.

Description

Technical Field

[0001] This invention relates to the field of distillation column tail gas treatment technology, and in particular to a continuous distillation column tail gas purification system. Background Technology

[0002] Distillation, as one of the most common and crucial unit operations in chemical separation processes, is widely used in petrochemicals, fine chemicals, pharmaceuticals, environmental protection, and many other fields. Its function is to achieve high-purity separation based on the different volatility of components in a mixture through multiple partial vaporization and partial condensation. Continuous distillation columns are core equipment in modern large-scale industrial production, widely adopted due to their advantages such as large throughput, stable product purity, and continuous operation. However, during the operation of continuous distillation columns, after the overhead distillate is condensed in the condenser, a portion of the gas components that are not completely condensed will always remain, forming the distillation column tail gas together with any non-condensable gases that may be present in the system.

[0003] Distillation is inherently an energy-intensive operation, with the reboiler's heating energy consumption accounting for the majority of total operating costs. The exhaust gas discharged from the top of the column typically carries a certain amount of thermal and pressure energy. In most existing technologies, this energy is often overlooked. Common practices include directly diverting the exhaust gas to subsequent treatment facilities or using a cooling water system to cool it to room temperature before treatment. This not only directly wastes high-quality thermal energy, but the cooling process itself also consumes additional electricity or cooling water resources, further increasing the plant's operating costs and carbon footprint.

[0004] Secondly, in addition to non-condensable gases, the tail gas from distillation columns often contains trace amounts of product vapors and valuable solvent vapors that have not been completely condensed in the condenser. Existing technologies for tail gas treatment mostly focus on "purification" and "emission compliance," that is, how to remove harmful or excessive components, such as direct incineration, activated carbon adsorption, or conventional washing. Although these methods can solve the emission compliance problem to a certain extent, they result in these valuable components lost with the tail gas being treated as "waste" and disposed of together—either through combustion and decomposition or by adsorption and disposal as hazardous waste. This not only causes direct product yield loss but also increases the raw material consumption per unit product. Therefore, existing tail gas treatment systems have disadvantages such as energy waste, insufficient resource recovery, and high end-of-pipe treatment costs.

[0005] Therefore, a continuous distillation column tail gas purification system was invented to solve the above problems. Summary of the Invention

[0006] The main objective of this invention is to provide a continuous distillation column tail gas purification system, which can effectively solve the technical problems in the background art.

[0007] To achieve the above objectives, the technical solution adopted by the present invention is as follows: a continuous distillation column tail gas purification system, comprising a distillation column body, wherein the top of the distillation column body is provided with a tail gas output end and the outer side is provided with a feed end, comprising:

[0008] The pressurized heat exchange assembly includes an exhaust gas booster and a feed preheater. The exhaust gas output end is connected to the input end of the feed preheater via the exhaust gas booster. The input end of the feed preheater is connected to a feed element. The output end of the feed preheater is connected to the feed end, so that the pressurized exhaust gas exchanges heat with the raw material to be distilled.

[0009] The reaction purification assembly includes a pressurized reactor, a gas-liquid separator, and an online gas analyzer. The pressurized reactor is connected to the output end of the feed preheater. The pressurized reactor is connected to a dosing device and has a purified gas outlet. The purified gas outlet is connected to the gas-liquid separator, and the gas outlet of the gas-liquid separator is connected to the online gas analyzer for detecting the concentration of recoverable components in the discharged separated gas.

[0010] The intelligent diversion component includes a switching valve group and a control module. The output of the online gas analyzer is connected to the switching valve group. The output of the switching valve group is connected to an vent pipe, a waste pipe, and a return pipe, respectively. The return pipe is connected to the reactor to form a gas circulation loop. The control module is electrically connected to the online gas analyzer and the switching valve group and is used to control the state of the switching valve group according to the gas detection results.

[0011] Preferably, the output end of the exhaust gas booster is connected to the first input end of the feed preheater through a first pipeline, the second output end of the feed preheater is connected to the feed end through a second pipeline, and the top of the pressurized reactor is connected to a recovery valve through a third pipeline, the input end of the recovery valve being connected to the first output end of the feed preheater.

[0012] Preferably, the dosing device includes a reagent tank, the output end of which is connected to a dosing pipeline via a metering pump, the output end of which is connected to the pressurized reactor, a pH sensor and a reagent distributor are installed inside the pressurized reactor, and the control module is electrically connected to the pH sensor and the metering pump for dynamically adjusting the dosing amount.

[0013] Preferably, the purified gas outlet is connected to the gas-liquid separator via a fourth pipeline, the gas outlet of the gas-liquid separator is connected to the online gas analyzer via a fifth pipeline, and the bottom of the gas-liquid separator is connected to a recovery pump and a recovery tank in sequence via a sixth pipeline.

[0014] Preferably, an vent valve is installed on the outer surface of the vent pipe, a waste valve is installed on the outer surface of the waste pipe, a return valve is installed on the outer surface of the return pipe, the output end of the return pipe is connected to a circulating compressor, the output end of the circulating compressor is connected to a seventh pipeline, and one end of the seventh pipeline is connected to the pressurized reactor via the recovery valve.

[0015] Preferably, a pressure sensor is installed at the top of the distillation column, and a temperature sensor is installed on the outer surface of the second pipeline. The control module is electrically connected to the pressure sensor, the temperature sensor, and the circulating compressor, and is used to dynamically adjust the power of the circulating compressor according to the sensor feedback signal. The feed component includes a raw material tank, and the output end of the raw material tank is connected to the distillation column feed pump through a pipeline. The output end of the distillation column feed pump is connected to the second input end of the feed preheater through a transport pipe.

[0016] This invention provides an operation method for a continuous distillation column tail gas purification system, comprising the following steps:

[0017] S1: The tail gas generated in the distillation column is pressurized and heated by the tail gas booster and then enters the feed preheater to exchange heat with the raw material to be distilled.

[0018] S2: The exhaust gas after being cooled by heat exchange in the feed preheater is introduced into the pressurized reactor to react and purify with the reagent injected by the dosing device;

[0019] S3: The gas-liquid mixture after the reaction is introduced into the gas-liquid separator for gas-liquid separation, and the concentration of recoverable components in the separated gas is monitored in real time using the online gas analyzer;

[0020] S4: The control module controls the switching valve group to switch to the corresponding operating mode based on the detection results of the gas online analyzer and the system safety status.

[0021] Preferably, the operating mode is as follows: when the concentration of recyclable components in the gas is detected to be lower than the first preset threshold, the intelligent control module controls the switching valve group to connect the vent pipe and directly discharge the gas that meets the emission standards.

[0022] Resource recovery mode: When the concentration of recyclable components in the gas is detected to be higher than the first preset threshold, the control module controls the switching valve group to connect the return pipe and send the gas back to the pressurized reactor for further processing.

[0023] Preferably, in the safe emission mode: when the system pressure exceeds the safety threshold, or when the gas is detected to still fail to meet the emission standards, the control module controls the switching valve group to connect to the waste pipe and send the gas to the plant's main waste gas treatment pipeline network.

[0024] Preferably, the liquid separated at the bottom of the gas-liquid separator is collected into the recovery tank by the recovery pump for the recovery of valuable organic matter;

[0025] When the operating method is applied to the system described in the claims, the control module synchronously receives feedback signals from the pressure sensor, pH sensor, and temperature sensor, and performs dynamic closed-loop regulation on the circulating compressor and the metering pump in the dosing unit.

[0026] The technical effects and advantages of this invention are as follows:

[0027] This invention utilizes a combined tail gas booster and feed preheater to pressurize and heat the tail gas, allowing it to exchange heat with the feedstock to be distilled. This increases the initial temperature of the feedstock, reduces the need for external energy to preheat it, and effectively lowers energy consumption during tail gas purification. Simultaneously, it fully utilizes the waste heat of the tail gas. Furthermore, a pressurized reactor further pressurizes the tail gas and reagents, ensuring a thorough reaction between the reagents and pollutants in the tail gas, resulting in deep purification. The control module automatically switches the valve group between operating mode, resource recovery mode, and safe emission mode based on the results from an online gas analyzer, achieving adaptive optimization. This transforms tail gas treatment from a simple environmental burden into a production process that combines energy saving, emission reduction, and resource recovery, improving the system's economy, environmental friendliness, and operational reliability. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0029] Figure 2 This is a schematic diagram of the overall structure of the present invention from another perspective;

[0030] Figure 3 This is a right view of the overall structure of the present invention;

[0031] Figure 4 This is a front view of the overall structure of the present invention;

[0032] Figure 5 This is a left view of the overall structure of the present invention;

[0033] Figure 6 For the present invention Figure 1 A magnified view of a section at point A in the middle;

[0034] Figure 7 This is a cross-sectional view of the pressurized reactor in this invention.

[0035] In the diagram: 1. Distillation column body; 2. Tail gas outlet; 3. Feed inlet;

[0036] 4. Pressurization heat exchange assembly; 401. Exhaust gas booster; 402. Feed preheater; 403. First pipeline; 404. Second pipeline; 405. Third pipeline; 406. Recovery valve;

[0037] 5. Reaction purification components; 501. Pressurized reactor; 5011. pH sensor; 5012. Reagent distributor; 502. Gas-liquid separator; 503. Online gas analyzer; 504. Purified gas outlet; 505. Fourth pipeline; 506. Fifth pipeline; 507. Sixth pipeline; 508. Recovery pump; 509. Recovery tank;

[0038] 6. Dosing equipment; 601. Chemical tank; 602. Metering pump; 603. Dosing pipeline;

[0039] 7. Intelligent diversion component; 701. Switching valve group; 702. Control module; 703. Drain pipe; 7031. Drain valve; 704. Waste pipe; 7041. Waste valve; 705. Return pipe; 7051. Return valve; 706. Circulating compressor; 707. Seventh pipeline;

[0040] 8. Feeding components; 801. Raw material tank; 802. Pipeline; 803. Distillation column feed pump; 804. Transport pipe; 9. Pressure sensor; 10. Temperature sensor. Detailed Implementation

[0041] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0042] Example 1

[0043] like Figures 1 to 3 As shown, this embodiment provides a continuous distillation column tail gas purification system, including a distillation column body 1, a tail gas output end 2 at the top of the distillation column body 1, and a feed end 3 on the outside. It includes a pressurization and heat exchange assembly 4, which includes a tail gas booster 401 and a feed preheater 402. The tail gas output end 2 is connected to the input end of the feed preheater 402 via the tail gas booster 401. The input end of the feed preheater 402 is connected to a feed element 8. The output end of the feed preheater 402 is connected to the feed end 3, so that the pressurized tail gas exchanges heat with the raw material to be distilled.

[0044] The output end of the exhaust gas booster 401 is connected to the first input end of the feed preheater 402 through the first pipeline 403. The second output end of the feed preheater 402 is connected to the feed end 3 through the second pipeline 404. The top of the pressurized reactor 501 is connected to a recovery valve 406 through the third pipeline 405. The input end of the recovery valve 406 is connected to the first output end of the feed preheater 402.

[0045] The feed unit 8 includes a raw material tank 801. The output end of the raw material tank 801 is connected to a distillation column feed pump 803 through a pipe 802. The output end of the distillation column feed pump 803 is connected to the second input end of the feed preheater 402 through a transport pipe 804.

[0046] In use, the tail gas generated at the top of the distillation column 1 is discharged through the tail gas output end 2 and enters the tail gas booster 401. The tail gas booster 401 pressurizes the tail gas, thereby increasing the pressure of the tail gas and providing power for the subsequent system to overcome resistance. At this time, the temperature of the tail gas will also rise after being compressed. The high-temperature tail gas after pressurization enters the high-temperature side of the feed preheater 402 through the first pipeline 403. At the same time, the raw material to be distilled is stored in the raw material tank 801. When the distillation column 1 needs to be fed, the distillation raw material in the distillation column 1 enters the low-temperature part of the feed preheater 402, i.e., the second input end of the feed preheater 402, through the pipeline 802 and the transport pipe 804 under the action of the distillation column feed pump 803. The distillation column feed pump 803 provides the flow power for the distillation raw material, ensuring that the distillation raw material can be stably and continuously transported to the designated location.

[0047] Inside the feed preheater 402, the raw material undergoes indirect heat exchange with the high-temperature exhaust gas flowing through the high-temperature side and transported by the first pipeline 403. The distillation raw material absorbs the residual heat of the exhaust gas, resulting in a significant temperature increase. This completes the energy-saving process of preheating the distillation raw material using the waste heat of the exhaust gas. The preheated distillation raw material flows out from the low-temperature side outlet of the feed preheater 402, i.e., the second output end of the feed preheater 402, and enters the distillation column 1 through the second pipeline 404 and the feed end 3 for distillation. At the same time, the heat of the high-temperature exhaust gas is used to heat the lower-temperature raw material to be distilled, which enters through the feed element 8. The cooled exhaust gas is discharged from the high-temperature side outlet of the feed preheater 402, i.e., the first output end. This process increases the temperature of the discharged exhaust gas by compressing and pressurizing it, and at the same time, it uses the residual heat of the exhaust gas to preheat the raw material to be distilled, which reduces the steam consumption of the reboiler in the distillation column 1 and achieves energy saving.

[0048] Example 2

[0049] like Figures 1 to 7As shown, the reaction purification component 5 includes a pressurized reactor 501, a gas-liquid separator 502, and an online gas analyzer 503. The pressurized reactor 501 is connected to the output end of the feed preheater 402. The pressurized reactor 501 is connected to a dosing device 6 and has a purified gas outlet 504. The purified gas outlet 504 is connected to the gas-liquid separator 502. The gas outlet of the gas-liquid separator 502 is connected to the online gas analyzer 503 for detecting the concentration of recoverable components in the discharged separated gas.

[0050] The dosing unit 6 includes a reagent tank 601. The output end of the reagent tank 601 is connected to a dosing pipeline 603 via a metering pump 602. The output end of the dosing pipeline 603 is connected to a pressurized reactor 501. A pH sensor 5011 and a reagent distributor 5012 are installed inside the pressurized reactor 501. The control module 702 is electrically connected to the pH sensor 5011 and the metering pump 602 for dynamically adjusting the dosing amount.

[0051] The purified gas outlet 504 is connected to the gas-liquid separator 502 via the fourth pipeline 505. The gas outlet of the gas-liquid separator 502 is connected to the gas online analyzer 503 via the fifth pipeline 506. The bottom of the gas-liquid separator 502 is connected to the recovery pump 508 and the recovery tank 509 in sequence via the sixth pipeline 507.

[0052] In use, the exhaust gas discharged from the feed preheater 402 enters the pressurized reactor 501 through the third pipeline 405. At this time, the reagent tank 601 in the dosing component 6 contains specific reaction reagents such as oxidants and alkaline solutions, which are used to decompose or neutralize organic matter and acidic components in the exhaust gas. The dosage of the reagent is controlled by the metering pump 602, and the reagent is injected into the pressurized reactor 501 through the dosing pipeline 603. The dosing pipeline 603 can be equipped with a flow meter and valves, which work with the metering pump 602 to achieve precise control of the reagent flow. After the reagent is added into the pressurized reactor 501, the reagent distributor 5012 ensures that the exhaust gas and the reagent are in full contact and react, effectively degrading or removing pollutants in the exhaust gas.

[0053] After deep purification, the gas-liquid mixture enters the gas-liquid separator 502 through the purified gas outlet 504 of the pressurized reactor 501 via the fourth pipeline 505 for gas-liquid phase separation. The separated purified gas is discharged from the top outlet of the gas-liquid separator 502 and enters the gas online analyzer 503 through the fifth pipeline 506. At this time, the gas online analyzer 503 monitors the concentration of recoverable components such as organic matter and solvent vapors in the purified gas in real time, waiting for further processing of the purified gas. Meanwhile, the separated liquid phase flows from the gas-liquid separator 502 into the recovery tank 509 through the sixth pipeline 507 under the action of the recovery pump 508 for recovery, so that the product lost with the tail gas can be recovered, reducing material loss.

[0054] Example 3

[0055] like Figures 1 to 7 As shown, the intelligent diversion component 7 includes a switching valve group 701 and a control module 702. The output of the gas online analyzer 503 is connected to the switching valve group 701. The output of the switching valve group 701 is connected to an vent pipe 703, a waste pipe 704, and a return pipe 705. The return pipe 705 is connected to the reactor 501 to form a gas circulation loop. The control module 702 is electrically connected to the gas online analyzer 503 and the switching valve group 701 and is used to control the state of the switching valve group 701 according to the gas detection results.

[0056] An vent valve 7031 is installed on the outer surface of the vent pipe 703, an waste valve 7041 is installed on the outer surface of the waste pipe 704, a return valve 7051 is installed on the outer surface of the return pipe 705, the output end of the return pipe 705 is connected to a circulating compressor 706, the output end of the circulating compressor 706 is connected to a seventh pipe 707, one end of the seventh pipe 707 is connected to the pressurized reactor 501 via a recovery valve 406.

[0057] A pressure sensor 9 is installed at the top of the distillation column 1, and a temperature sensor 10 is installed on the outer surface of the second pipeline 404. The control module 702 is electrically connected to the pressure sensor 9, the temperature sensor 10 and the circulating compressor 706, and is used to dynamically adjust the power of the circulating compressor 706 according to the sensor feedback signal.

[0058] During operation, the online gas analyzer 503 monitors the concentration of recoverable components such as organic matter and solvent vapors in the purified gas in real time and transmits the detection signal to the control module 702. The analyzed gas enters the switching valve group 701 through the online gas analyzer 503. At this time, the control module 702 controls the switching valve group 701 to switch to the corresponding operating mode based on the detection results of the online gas analyzer 503 and the system safety status.

[0059] When the gas online analyzer 503 detects that the concentration of recyclable components in the purified gas is lower than the first preset threshold, the control module 702 determines that the standard is met, controls the switching valve group 701 to connect to the vent pipe 703, and opens the vent valve 7031 to directly discharge the purified gas that meets the emission standards into the atmosphere. In this mode, the circulating compressor 706 can stop running to save energy.

[0060] When the gas online analyzer 503 detects that the concentration of recoverable components in the purified gas is higher than the first preset threshold, the control module 702 determines that the gas quality is not up to standard, controls the switching valve group 701 to connect the return pipe 705, and opens the return valve 7051 and the circulating compressor 706. The circulating compressor 706 pressurizes the purified gas and then sends it to the recovery valve 406 through the seventh pipeline 707. The gas then merges with the tail gas from the feed preheater 402 and re-enters the pressurized reactor 501 for further reaction and purification until the gas quality meets the standard.

[0061] When the system pressure exceeds the safety threshold, or when the gas online analyzer 503 detects that the concentration of pollutants in the purified gas still exceeds the second preset threshold, the control module 702 determines that it is in an abnormal state, controls the switching valve group 701 to connect the waste pipe 704, and opens the waste valve 7041 to send the gas to the plant's main waste gas treatment pipeline for final disposal, as an environmental safety guarantee for the system.

[0062] Example 4

[0063] This embodiment provides an operation method for a continuous distillation column tail gas purification system.

[0064] S1: The tail gas generated in the distillation column 1 is pressurized and heated by the tail gas booster 401 and enters the feed preheater 402 to exchange heat with the raw material to be distilled.

[0065] S2: The exhaust gas after being cooled by heat exchanger 402 is introduced into pressurized reactor 501 and reacted and purified with the reagent injected by dosing device 6.

[0066] S3: The gas-liquid mixture after the reaction is introduced into the gas-liquid separator 502 for gas-liquid separation, and the concentration of recoverable components in the separated gas is monitored in real time using the online gas analyzer 503;

[0067] S4: Based on the detection results of the gas online analyzer 503 and the system safety status, the control module 702 controls the switching valve group 701 to switch to the corresponding operating mode.

[0068] Operating mode: When the concentration of recyclable components in the gas is detected to be lower than the first preset threshold, the intelligent control module 702 controls the switching valve group 701 to connect the vent pipe 703 and directly discharge the gas that meets the emission standards.

[0069] Resource recovery mode: When the concentration of recyclable components in the gas is detected to be higher than the first preset threshold, the control module 702 controls the switching valve group 701 to connect the return pipe 704 and send the gas back to the pressurized reactor 501 for further processing.

[0070] Safe emission mode: When the system pressure exceeds the safety threshold, or when the gas is detected to still fail to meet the emission standards, the control module 702 controls the switching valve group 701 to connect the waste pipe 705 and send the gas to the plant's main waste gas treatment pipeline network.

[0071] The liquid separated at the bottom of the gas-liquid separator 502 is collected into the recovery tank 509 by the recovery pump 508 for the recovery of valuable organic matter.

[0072] When the operating method is applied to the exhaust gas purification system, the control module 702 synchronously receives feedback signals from the pressure sensor 9, pH sensor 5011 and temperature sensor 10, and performs dynamic closed-loop regulation on the circulating compressor 706 and the metering pump 602 in the dosing unit 6 to ensure that the system is in the optimal exhaust gas purification condition.

[0073] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of this invention is defined by the appended claims and their equivalents.

Claims

1. A continuous distillation column tail gas purification system, comprising a distillation column body, wherein the top of the distillation column body is provided with a tail gas output end and the outer side is provided with a feed end, characterized in that, include: The pressurized heat exchange assembly includes an exhaust gas booster and a feed preheater. The exhaust gas output end is connected to the input end of the feed preheater via the exhaust gas booster. The input end of the feed preheater is connected to a feed element. The output end of the feed preheater is connected to the feed end, so that the pressurized exhaust gas exchanges heat with the raw material to be distilled. The reaction purification assembly includes a pressurized reactor, a gas-liquid separator, and an online gas analyzer. The pressurized reactor is connected to the output end of the feed preheater. The pressurized reactor is connected to a dosing device and has a purified gas outlet. The purified gas outlet is connected to the gas-liquid separator, and the gas outlet of the gas-liquid separator is connected to the online gas analyzer for detecting the concentration of recoverable components in the discharged separated gas. The intelligent diversion component includes a switching valve group and a control module. The output of the online gas analyzer is connected to the switching valve group. The output of the switching valve group is connected to an vent pipe, a waste pipe, and a return pipe, respectively. The return pipe is connected to the reactor to form a gas circulation loop. The control module is electrically connected to the online gas analyzer and the switching valve group and is used to control the state of the switching valve group according to the gas detection results.

2. The continuous distillation column tail gas purification system according to claim 1, characterized in that: The exhaust gas booster output is connected to the first input of the feed preheater via a first pipeline, the second output of the feed preheater is connected to the feed end via a second pipeline, and the top of the pressurized reactor is connected to a recovery valve via a third pipeline, the input of which is connected to the first output of the feed preheater.

3. The continuous distillation column tail gas purification system according to claim 1, characterized in that: The dosing device includes a reagent tank, the output end of which is connected to a dosing pipeline via a metering pump. The output end of the dosing pipeline is connected to the pressurized reactor. A pH sensor and a reagent distributor are installed inside the pressurized reactor. The control module is electrically connected to the pH sensor and the metering pump for dynamically adjusting the dosing amount.

4. The continuous distillation column tail gas purification system according to claim 1, characterized in that: The purified gas outlet is connected to the gas-liquid separator via a fourth pipeline, the gas outlet of the gas-liquid separator is connected to the online gas analyzer via a fifth pipeline, and the bottom of the gas-liquid separator is connected to a recovery pump and a recovery tank via a sixth pipeline.

5. The continuous distillation column tail gas purification system according to claim 1, characterized in that: An vent valve is installed on the outer surface of the vent pipe, an waste valve is installed on the outer surface of the waste pipe, a return valve is installed on the outer surface of the return pipe, the output end of the return pipe is connected to a circulating compressor, the output end of the circulating compressor is connected to a seventh pipeline, and one end of the seventh pipeline is connected to the pressurized reactor via the recovery valve.

6. The continuous distillation column tail gas purification system according to claim 1, characterized in that: A pressure sensor is installed at the top of the distillation column, and a temperature sensor is installed on the outer surface of the second pipeline. The control module is electrically connected to the pressure sensor, the temperature sensor, and the circulating compressor, and is used to dynamically adjust the power of the circulating compressor according to the sensor feedback signal. The feed component includes a raw material tank, and the output end of the raw material tank is connected to the distillation column feed pump through a pipeline. The output end of the distillation column feed pump is connected to the second input end of the feed preheater through a transport pipe.

7. The continuous distillation column tail gas purification system according to claim 1, characterized in that: Includes the following steps: S1: The tail gas generated in the distillation column is pressurized and heated by the tail gas booster and then enters the feed preheater to exchange heat with the raw material to be distilled. S2: The exhaust gas after being cooled by heat exchange in the feed preheater is introduced into the pressurized reactor to react and purify with the reagent injected by the dosing device; S3: The gas-liquid mixture after the reaction is introduced into the gas-liquid separator for gas-liquid separation, and the concentration of recoverable components in the separated gas is monitored in real time using the online gas analyzer; S4: The control module controls the switching valve group to switch to the corresponding operating mode based on the detection results of the gas online analyzer and the system safety status.

8. The continuous distillation column tail gas purification system according to claim 7, characterized in that: When the concentration of recyclable components in the gas is detected to be lower than the first preset threshold, the intelligent control module controls the switching valve group to connect the vent pipe and directly discharge the gas that meets the emission standards. When the concentration of recyclable components in the gas is detected to be higher than the first preset threshold, the control module controls the switching valve group to connect the return pipe and send the gas back to the pressurized reactor for further processing.

9. The continuous distillation column tail gas purification system according to claim 7, characterized in that: Safe emission mode: When the system pressure exceeds the safety threshold, or when the gas is detected to still fail to meet the emission standards, the control module controls the switching valve group to connect the waste pipe and send the gas to the plant's main waste gas treatment pipeline network.

10. A continuous distillation column tail gas purification system according to claim 7, characterized in that, The liquid separated at the bottom of the gas-liquid separator is collected into the recovery tank using the recovery pump for the recovery of valuable organic matter. When the operating method is applied to the system of claim 6, the control module synchronously receives feedback signals from the pressure sensor, pH sensor and temperature sensor, and performs dynamic closed-loop regulation on the circulating compressor and the metering pump in the dosing unit.

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