An acetic anhydride production tail gas adsorption recovery device

Abstract

This utility model belongs to the technical field of adsorption and recovery devices, and in particular to an adsorption and recovery device for acetic anhydride production tail gas. It includes a condenser for cooling the tail gas, a spray tank for neutralizing acidic gases in the tail gas, and an adsorption tank for adsorbing residual harmful components in the tail gas. It also includes a first valve body installed on the tail gas inlet pipe of the condenser for controlling the opening and closing of the pipe, a second valve body installed on the tail gas outlet pipe of the condenser for controlling the opening and closing of the pipe, and a controller. Both the first and second valve bodies are connected to the controller, and both are controlled by the controller. By incorporating valves, a temperature sensor assembly, and a pressure sensor, it optimizes the condensation effect and improves the resource recovery rate, enabling high-concentration gases to be fully cooled and liquefied within the condenser, thus achieving resource recovery.

Description

Technical Field

[0001] This utility model belongs to the technical field of adsorption and recovery devices, specifically relating to an adsorption and recovery device for acetic anhydride production tail gas. Background Technology

[0002] Acetic anhydride production tail gas adsorption and recovery devices are mainly used to treat the tail gas generated during the production process, reduce pollution, and achieve resource recovery and utilization. They are primarily based on the principles of physical or chemical adsorption, utilizing the highly selective adsorption of harmful components such as acetic anhydride in the tail gas by the adsorbent to achieve the dual goals of tail gas purification and resource recovery. Existing acetic anhydride production tail gas adsorption and recovery devices simply inject high-concentration tail gas into a condenser for condensation, and then pipe it into a spray tank. The tail gas enters from the bottom or side of the tower through pipes, is evenly dispersed into the tower by an inlet distributor, and the spray liquid (usually water, alkaline solution, or organic solvent) is stored in the circulation tank at the bottom of the tower and pumped to the top spray layer. It is then sprayed out to perform a secondary spray on the production tail gas, and finally enters the adsorption tank. The adsorbent (such as activated carbon, molecular sieve, or special resin) captures the target substance through physical or chemical action. However, because the gas is floating, it cannot be condensed in the tank for a long time. Some high-concentration gas is not fully condensed by the condenser and will drift into the spray tank through pipes, failing to achieve the most effective cooling and liquefaction for resource recovery. Based on the above situation, it is necessary to design an acetic anhydride production tail gas adsorption and recovery device to solve the problems mentioned above. Utility Model Content

[0003] To address the above problems, the purpose of this utility model is to provide an adsorption and recovery device for acetic anhydride production tail gas, thereby solving the problems mentioned in the background art.

[0004] This invention provides an adsorption and recovery device for acetic anhydride production tail gas. By setting valves, temperature sensor components and pressure sensors, it optimizes the condensation effect and improves the resource recovery rate, so that high-concentration gas is fully cooled and liquefied in the condensation tank to achieve resource recovery.

[0005] The technical problem solved by this utility model is achieved by the following technical solution:

[0006] An acetic anhydride production tail gas adsorption and recovery device includes a condenser for cooling the tail gas, a spray tank for neutralizing acidic gases in the tail gas, and an adsorption tank for adsorbing residual harmful components in the tail gas. The tail gas output end of the condenser, the tail gas input end of the spray tank, the tail gas output end of the spray tank, and the tail gas input end of the adsorption tank are sequentially connected by pipes. The device also includes a first valve body installed on the tail gas input end pipe of the condenser for controlling the opening and closing of the pipe, a second valve body installed on the tail gas output end pipe of the condenser for controlling the opening and closing of the pipe, and a controller. Both the first valve body and the second valve body are connected to the controller, and both the first valve body and the second valve body are controlled by the controller.

[0007] Preferably, the exhaust gas inlet of the condenser is connected to the gas storage tank via an exhaust gas flow pipe.

[0008] Preferably, the exhaust gas inlet of the gas storage tank is equipped with a first air pump for drawing in exhaust gas, and the exhaust gas outlet of the gas storage tank is equipped with a second air pump for drawing out exhaust gas and sending it into the condenser through an exhaust gas flow pipe. Both the first air pump and the second air pump are connected to the controller and are controlled by the controller.

[0009] Preferably, the side wall of the condenser is provided with a pressure sensor for detecting the internal pressure of the condenser.

[0010] Preferably, a third air pump is provided on the pipe connecting the exhaust gas output end of the condenser tank and the exhaust gas input end of the spray tank.

[0011] Preferably, the condenser is equipped with a sensor assembly inside the tank body for monitoring whether there is a temperature difference between the upper and lower exhaust gases inside the condenser.

[0012] The beneficial effects of this utility model are: by setting valves, temperature sensor components and pressure sensors, it can optimize the condensation effect and improve the resource recovery rate, so that high-concentration gas can be fully cooled and liquefied in the condensation tank, thereby realizing resource recovery. Attached Figure Description

[0013] Figure 1 This is a front view of the present invention;

[0014] Figure 2 This is a perspective view of the present utility model;

[0015] Figure 3 This is a front sectional view of the present invention;

[0016] Figure 4 This is the left view of the present invention.

[0017] In the diagram: 1. Condenser tank; 2. Spray tank; 3. Adsorption tank; 4. Gas storage tank; 5. Condenser; 6. Controller; 7. Expansion valve; 8. Compressor; 9. Pressure sensor; 10. Second valve body; 11. Third air pump; 12. First air pump; 13. Second air pump; 14. First valve body; 15. Exhaust stack; 16. Water pump; 17. Water tank; 18. Sprayer; 19. Air inlet distributor; 20. Evaporator; 21. First temperature sensor; 22. Second temperature sensor; 23. Third valve body; 24. Fourth valve body. Detailed Implementation

[0018] To enable those skilled in the art to better understand the technical solution of this utility model, the present utility model will be described in detail below with reference to the accompanying drawings. The description in this part is only exemplary and explanatory, and should not be used to limit the scope of protection of this utility model in any way.

[0019] Existing acetic anhydride production tail gas adsorption and recovery devices mainly include a condenser tank 1 for initial condensation of high-concentration gas, a spray tank 2 for secondary neutralization of the tail gas, an adsorption tank 3 for adsorption treatment of residual components in the tail gas, a condensation device connected to the condenser tank 1, and a spray device connected to the spray tower. During tail gas adsorption and recovery, these three devices work sequentially to effectively remove acetic anhydride components from the tail gas. In operation, the tail gas is introduced into the condenser tank 1 through a pipeline. In the condenser tank 1, the condensation device operates, and the compressor 8 converts the gaseous gas into acetic anhydride... The refrigerant is compressed from a low-pressure gaseous state to a high-pressure liquid state (liquefaction releases heat) and enters the condenser 5. The high-temperature, high-pressure liquid refrigerant releases heat to the surrounding environment through heat exchange with the outside. Then, it passes through the expansion valve 7 for throttling and pressure reduction before entering the evaporator 20. The refrigerant in the evaporator 20 vaporizes and absorbs heat (absorbing heat from the surrounding environment). The exhaust gas condenses through heat exchange with the evaporator 20. After condensation, the exhaust gas flows through a pipe into the spray tank 2 and is evenly dispersed into the tower by the air inlet distributor 19. A spray device is installed on the top of the spray tank 2. When the fourth valve 24 is opened, the third... Valve 23 remains closed. The absorbent liquid (such as alkali or water) in the tank is introduced into the spray device via pump 16. If the absorbent liquid in the tank is insufficient, the fourth valve 24 is closed, and the third valve 23 is opened. The absorbent liquid in the water tank 17 is then introduced into the sprayer 18 via pump 16 and sprayed into fine droplets. These droplets fill the space of the spray tank 2, ensuring full contact with the exhaust gas and secondary neutralization of the acidic gases in the exhaust gas. The exhaust gas after spraying flows into the adsorption tank 3 through a pipe, where it fully contacts the activated carbon or other adsorbents. The activated carbon captures the gases in the exhaust gas through physical adsorption. The adsorbent concentrates organic compounds such as acetic anhydride on the surface of the adsorbent, and the adsorbed gas is discharged through the exhaust pipe 15 at the top of the tank. The above is the specific working process of the existing acetic anhydride production tail gas adsorption and recovery device. The problem with the existing acetic anhydride production tail gas adsorption and recovery device is that, since the recovery device is connected by pipelines, the gas is always in a flowing state and cannot be condensed in the condenser 1 for a long time. It cannot achieve the most effective cooling and liquefaction to realize resource recovery. Therefore, the existing acetic anhydride production tail gas adsorption and recovery device often cannot fully condense and recover the tail gas.

[0020] Based on the above problems, the present invention adopts the following improvement method to solve them.

[0021] like Figure 1As shown, this utility model provides an adsorption and recovery device for acetic anhydride production tail gas, including a condenser 1 for cooling the tail gas, a spray tank 2 for neutralizing acidic gases in the tail gas, and an adsorption tank 3 for adsorbing harmful components remaining in the tail gas. The tail gas output end of the condenser 1, the tail gas input end of the spray tank 2, the tail gas output end of the spray tank 2, and the tail gas input end of the adsorption tank 3 are sequentially connected by pipes. It also includes a first [device name missing] installed on the tail gas input end pipe of the condenser 1 for controlling the opening and closing of the pipe. The present invention comprises a valve body 14, a second valve body 10 installed on the tail gas output pipe of the condenser tank 1 for controlling the opening and closing of the pipe, and a controller 6. Both the first valve body 14 and the second valve body 10 are connected to the controller 6, and both the first valve body 14 and the second valve body 10 are controlled by the controller 6. The present invention shares similarities with the existing acetic anhydride production tail gas adsorption and recovery device in that both have a condenser tank 1, a spray tank 2, an adsorption tank 3, a condenser unit, and a spray unit. The difference lies in the addition of the first valve body 14 and the second valve body 10. The system comprises a first valve body 14, a second valve body 10, and a controller 6. Through the coordinated operation of the valve bodies and the controller 6, the first valve body 14 and the second valve body 10 are simultaneously closed, allowing the exhaust gas to be fully condensed and recovered inside the condenser tank 1. Specifically, the first valve body 14 is opened and the second valve body 10 is closed to allow the exhaust gas to enter the condenser tank 1. After the exhaust gas has fully entered the condenser tank 1, the first valve body 14 is closed, and the second valve body 10 remains closed, thus keeping the condenser tank 1 sealed and recovering the exhaust gas. Sufficient time is allowed for the gaseous acetic anhydride in the exhaust gas to remain in the condenser tank 1, enabling it to fully condense and liquefy. Then, by closing the first valve body 14 and opening the second valve body 10, the fully condensed exhaust gas is injected into the spray tank 2 through the exhaust gas flow pipe to further remove the acetic anhydride component from the exhaust gas. Compared with the prior art, the present invention achieves the effect of allowing the exhaust gas containing acetic anhydride to remain in the condenser tank 1 for a longer time, thereby ensuring sufficient cooling and improving the acetic anhydride condensation and liquefaction recovery rate.

[0022] Furthermore, such as Figure 2 As shown, the exhaust gas inlet of the condenser 1 is connected to the gas storage tank 4 through the exhaust gas flow pipe. By setting up the gas storage tank 4, a large amount of exhaust gas can be temporarily stored.

[0023] Furthermore, such as Figure 2As shown, the exhaust gas inlet of the gas storage tank 4 is equipped with a first air pump 12 for drawing in exhaust gas, and the exhaust gas outlet of the gas storage tank 4 is equipped with a second air pump 13 for drawing out exhaust gas and sending it into the condenser tank 1 through the exhaust gas flow pipe. Both the first air pump 12 and the second air pump 13 are connected to the controller 6 and are controlled by the controller 6. By setting the first air pump 12, the exhaust gas is drawn into the gas storage tank 4 for temporary storage. At the same time, the setting of the first air pump 12 can realize the high-pressure storage of the gas storage tank 4, thereby storing more exhaust gas. By setting the second air pump 13, the exhaust gas inside the gas storage tank 4 is drawn out and introduced into the condenser tank 1. At the same time, the setting of the second air pump 13 can realize the exhaust gas inside the gas storage tank 4 entering the condenser tank 1 more quickly.

[0024] Furthermore, such as Figure 3 As shown, a pressure sensor 9 is installed on the side wall of the condenser tank 1 to detect the internal pressure of the condenser tank 1. Specifically, when the exhaust gas from the storage tank 4 is injected into the condenser tank 1, the second valve body 10 is closed, the first valve body 14 is opened, and the second air pump 13 starts working. After the exhaust gas from the storage tank 4 is introduced into the condenser tank 1 through the exhaust gas flow pipe, the pressure sensor 9 monitors the internal pressure of the condenser tank 1 as it continuously increases. When the pressure reaches a certain level, the first valve body 14 is closed, and the second valve body 10 also... Keeping the valve closed, the second air pump 13 stops working, thereby keeping the condenser tank 1 sealed and allowing the exhaust gas to remain in the condenser tank 1 for a sufficient time to fully condense and liquefy the acetic anhydride component in the exhaust gas. Then, by opening the second valve body 10 while keeping the first valve body 14 closed, the fully condensed exhaust gas is injected into the spray tank 2 through the exhaust gas flow pipe. At this time, the air pressure inside the condenser tank 1 continuously decreases. When the air pressure decreases to a certain value, the second valve body 10 is closed, the first valve body 14 is opened, and the second air pump 13 starts working, repeating the operation.

[0025] Furthermore, such as Figure 3 As shown, a third air pump 11 is installed on the pipe connecting the exhaust gas output end of the condenser tank 1 and the exhaust gas input end of the spray tank 2. By setting the third air pump 11, after the exhaust gas inside the condenser tank 1 is fully condensed and liquefied, the second valve body 10 is opened and the first valve body 14 is closed at the same time. The third air pump 11 starts to work, and the fully condensed and liquefied exhaust gas inside the condenser tank 1 is drawn into the spray tank 2 more quickly to further remove the acetic anhydride component in the exhaust gas.

[0026] Furthermore, such as Figure 3As shown, the exhaust gas entering the condenser 1 will stratify due to temperature differences. As is well known, higher-temperature gases rise to the top, while lower-temperature gases accumulate at the bottom. If the exhaust gas inside the condenser is sufficiently cooled, the temperatures of the upper and lower layers will be equal or very small. Based on this phenomenon, a sensor assembly is installed inside the condenser 1 to monitor the temperature difference between the upper and lower exhaust gases. This allows for monitoring whether the exhaust gas is sufficiently cooled. The temperature sensor is connected to the controller 6, providing a signal indicating the temperature difference between the upper and lower parts of the condenser 1. The controller 6 then determines whether the condenser 1 should exhaust gas based on the acquired temperature difference signal. Specifically… The sensor assembly can be implemented by setting a first temperature sensor 21 and a second temperature sensor 22. The temperature sensors can monitor the temperature inside the tank in real time. By setting the first temperature sensor 21 located at the top of the condenser tank 1 and the second temperature sensor 22 located on the lower side wall inside the condenser tank 1, when the first temperature sensor 21 and the second temperature sensor 22 detect that the temperature difference inside the condenser tank 1 is small or there is no temperature difference, the second valve body 10 is opened, while the first valve body 14 remains closed, and the third air pump 11 starts to work. The third air pump 11 is used to quickly draw the fully condensed exhaust gas inside the condenser tank 1 into the spray tank 2 to further remove the acetic anhydride component in the exhaust gas.

[0027] It should be noted that, in this document, the terms “comprising,” “including,” or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus. This article uses specific examples to illustrate the principles and implementation methods of this utility model. The above examples are only for the purpose of helping to understand the method and core ideas of this utility model. The above description is only a preferred embodiment of this utility model. It should be noted that due to the limitations of textual expression, there are objectively infinite specific structures. For those skilled in the art, several improvements, modifications, or changes can be made without departing from the principles of this utility model, and the above technical features can also be combined in an appropriate manner. These improvements, modifications, changes, or combinations, or the direct application of the inventive concept and technical solution to other situations without modification, should all be considered within the protection scope of this utility model.

Claims

1. An adsorption and recovery device for acetic anhydride production tail gas, comprising a condenser (1) for cooling the tail gas, a spray tank (2) for neutralizing acidic gases in the tail gas, and an adsorption tank (3) for adsorbing harmful components remaining in the tail gas, wherein the tail gas output end of the condenser (1), the tail gas input end of the spray tank (2), the tail gas output end of the spray tank (2), and the tail gas input end of the adsorption tank (3) are sequentially connected by pipelines, characterized in that: It also includes a first valve body (14) installed on the exhaust gas inlet pipe of the condenser (1) and used to control the opening and closing of the pipe, a second valve body (10) installed on the exhaust gas outlet pipe of the condenser (1) and used to control the opening and closing of the pipe, and a controller (6). The first valve body (14) and the second valve body (10) are both connected to the controller (6), and the first valve body (14) and the second valve body (10) are both controlled by the controller (6).

2. The acetic anhydride production tail gas adsorption and recovery device according to claim 1, characterized in that: The tail gas inlet of the condenser (1) is connected to the gas storage tank (4) through the tail gas flow pipe.

3. The acetic anhydride production tail gas adsorption and recovery device according to claim 2, characterized in that: The gas storage tank (4) is equipped with a first gas pump (12) for drawing in exhaust gas at the exhaust gas input end, and a second gas pump (13) for drawing out exhaust gas and sending it into the condenser tank (1) through the exhaust gas flow pipe at the exhaust gas output end of the gas storage tank (4). The first gas pump (12) and the second gas pump (13) are both connected to the controller (6) and are controlled by the controller (6).

4. The acetic anhydride production tail gas adsorption and recovery device according to claim 1, characterized in that: The side wall of the condenser (1) is provided with a pressure sensor (9) for detecting the internal pressure of the condenser (1).

5. The acetic anhydride production tail gas adsorption and recovery device according to claim 1, characterized in that: A third air pump (11) is provided on the pipe connecting the tail gas output end of the condenser (1) and the tail gas input end of the spray tank (2).

6. The acetic anhydride production tail gas adsorption and recovery device according to claim 1, characterized in that: The condenser (1) is equipped with a sensor assembly inside the tank body for monitoring whether there is a temperature difference between the upper and lower exhaust gases inside the condenser (1).

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