Sewage methanol recovery system

Abstract

The utility model provides a dirty methanol recovery system, and relates to the technical field of dirty methanol recovery. The dirty methanol recovery system comprises a liquid storage device, the liquid storage device comprises a first liquid storage tank and a second liquid storage tank, the first liquid storage tank is communicated with the second liquid storage tank through a first pipeline, and the first liquid storage tank and the second liquid storage tank are both used for storing dirty methanol liquid; the liquid inlet device is communicated with the first liquid storage tank through a second pipeline, and the dirty methanol liquid enters the first liquid storage tank through the liquid inlet device; the first valve is arranged on the first pipeline and is used for controlling the connection and disconnection of the first pipeline; the second valve is arranged on the second pipeline and is used for controlling the connection and disconnection of the second pipeline; wherein the liquid inlet device is located above the first liquid storage tank in the vertical direction, and the first liquid storage tank is located above the second liquid storage tank. According to the technical scheme, redundant methanol generated in daily operation can be rapidly and safely treated, and potential safety hazards and extra workload are reduced.

Description

Technical Field

[0001] The present application relates to the technical field of contaminated methanol recovery, and in particular to a contaminated methanol recovery system. Background Art

[0002] The dirty methanol storage tank is an important storage equipment in the chemical industry, mainly used to store dirty methanol discharged from the process.

[0003] In daily process operations, such as the adjustment of the liquid level of the methanol pump seal tank in the low-temperature methanol washing system, a small amount of excess methanol will be produced. These methanol are usually temporarily stored in plastic sealed barrels and then sent to the water treatment device for recycling. This practice not only increases the workload of process personnel, but also poses certain safety hazards (such as flammability, volatility, etc.), while also increasing energy consumption and environmental impact. If the dirty methanol drainage pipeline is not used for a long time, it may cause valve failure or pipeline blockage, which will prevent the equipment from draining the internal liquid smoothly when maintenance is required, thereby affecting the safety maintenance work.

[0004] Therefore, a contaminated methanol recovery system is needed to at least solve the above problems. Utility Model Content

[0005] The purpose of the embodiments of the present application is to provide a contaminated methanol recovery system to quickly and safely process excess methanol generated during daily operations, thereby reducing safety hazards and additional workload.

[0006] In order to solve the above technical problems, the embodiments of the present application provide the following technical solutions:

[0007] The present application provides a contaminated methanol recovery system, comprising: a liquid storage device, the liquid storage device comprising a first liquid storage tank and a second liquid storage tank, the first liquid storage tank and the second liquid storage tank being connected via a first pipeline, the first liquid storage tank and the second liquid storage tank being both used to store contaminated methanol liquid; a liquid inlet device, the liquid inlet device being connected to the first liquid storage tank via a second pipeline, the contaminated methanol liquid entering the first liquid storage tank via the liquid inlet device; a first valve, the first valve being arranged on the first pipeline, for controlling the on-off of the first pipeline; a second valve, the second valve being arranged on the second pipeline, for controlling the on-off of the second pipeline; wherein the liquid inlet device is located above the first liquid storage tank in a vertical direction, and the first liquid storage tank is located above the second liquid storage tank.

[0008] In some embodiments of the present application, the liquid inlet device includes a device body and a sealing cover, the device body has a liquid inlet; the sealing cover is rotatably connected to the device body and is used to seal the liquid inlet.

[0009] In some embodiments of the present application, the cross-sectional area of ​​the device body gradually decreases from the liquid inlet along the vertical direction.

[0010] In some embodiments of the present application, the contaminated methanol recovery system further includes a first driving device, which is disposed on the device body, and a driving end of the first driving device is connected to the sealing cover for driving the sealing cover to rotate.

[0011] In some embodiments of the present application, the contaminated methanol recovery system also includes a sealing gasket, which is arranged on the edge of the liquid inlet of the device body, or covers the surface of the sealing cover facing the liquid inlet, and the sealing gasket is flexible and insulating.

[0012] In some embodiments of the present application, the second liquid storage tank has an air inlet and an air outlet, the air inlet is connected to the gas storage device through a third pipeline, the third pipeline is used to introduce the inert gas in the gas storage device into the second liquid storage tank, and a third valve is provided on the third pipeline, and the third valve is used to control the on-off of the third pipeline; the air outlet is connected to the gas processing device through a fourth pipeline, and the fourth pipeline is used to export the gas in the second liquid storage tank to the gas processing device for processing, and a fourth valve is provided on the fourth pipeline, and the fourth valve is used to control the on-off of the fourth pipeline.

[0013] In some embodiments of the present application, the contaminated methanol recovery system also includes a fifth pipeline, through which the second liquid storage tank is connected to the methanol regeneration device; a second driving device, which is arranged on the fifth pipeline and is used to drive the liquid in the second liquid storage tank to be introduced into the methanol regeneration device; and a fifth valve, which is arranged on the fifth pipeline and is used to control the on-off of the fifth pipeline.

[0014] In some embodiments of the present application, the contaminated methanol recovery system further includes a liquid level detection device, which is connected to the first liquid storage tank and is used to detect the liquid level height in the first liquid storage tank.

[0015] In some embodiments of the present application, the contaminated methanol recovery system also includes a control device, which is communicatively connected to the liquid level detection device, the first valve, and the second valve, respectively, and controls the switching of the first valve and the second valve according to the detection data of the liquid level detection device; the first valve and the second valve are both electric valves.

[0016] In some embodiments of the present application, the sealing cover and the device body are electrically connected to the ground via wires respectively.

[0017] Compared with the prior art, the dirty methanol recovery system provided by the present application, in the process of collecting dirty methanol, first opens the second valve, keeps the first valve closed, and the dirty methanol is sent to the first liquid storage tank through the liquid inlet device under the action of gravity. By closing the first valve, air can be prevented from entering the second liquid storage tank through the liquid inlet device, and the formation of explosive mixed gas can be prevented, thereby reducing safety hazards. When the liquid level in the first liquid storage tank reaches a certain height, the second valve is closed, the first valve is opened, and the dirty methanol flows into the second liquid storage tank through the first pipeline under the action of gravity. After the transfer is completed, the first valve is closed. By closing the second valve, the toxic and harmful gases inside the second liquid storage tank can be prevented from being released into the surrounding environment through the liquid inlet device, reducing the safety risks of process personnel during inspections, and reducing pollution to the environment. At the same time, gravity flow is used instead of pumping, which reduces the demand for power equipment and reduces the operating steps, not only reducing energy consumption but also improving recovery efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] By reading the detailed description below with reference to the accompanying drawings, the above and other purposes, features and advantages of the exemplary embodiments of the present application will become easy to understand. In the accompanying drawings, several embodiments of the present application are shown in an exemplary and non-limiting manner, and the same or corresponding reference numerals represent the same or corresponding parts, wherein:

[0019] Figure 1 The structural diagram of the contaminated methanol recovery system of the present application is schematically shown.

[0020] Description of Figure Numbers:

[0021] 1. First liquid storage tank; 2. Second liquid storage tank; 3. Liquid inlet device; 301. Device body; 302. Sealing cover; 4. First pipeline; 5. Second pipeline; 6. Ground; 7. Third pipeline; 8. Fourth pipeline; 9. Fifth pipeline; 10. First valve; 11. Second valve; 12. Third valve; 13. Fourth valve; 14. Fifth valve; 15. Sixth valve; 16. Gas storage device; 17. Gas processing device; 18. Methanol regeneration device; 19. Second drive device; 20. Underground pipeline network. DETAILED DESCRIPTION

[0022] The exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although the exemplary embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments described herein. On the contrary, these embodiments are provided in order to enable a more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art.

[0023] It should be noted that, unless otherwise specified, the technical terms or scientific terms used in this application should have the common meanings understood by technicians in the field to which this application belongs.

[0024] The dirty methanol storage tank is a special storage equipment used in the chemical industry. It can be a horizontal metal storage tank used to store and process dirty methanol. The dirty methanol storage tank is generally placed in a pit, which is usually located underground or semi-underground to provide the necessary support and isolation for the dirty methanol storage tank. The above-ground equipment transports the dirty methanol to the storage tank through an underground pipeline system.

[0025] In the prior art, the dirty methanol storage tank is only used to collect the dirty methanol discharged into the underground pipe network. If the drainage pipeline is not used for a long time, a valve failure may occur, resulting in the valve being unable to open normally, and then the drainage pipeline may be blocked, affecting the normal drainage operation. When the equipment needs to be isolated and the drainage is handed over for maintenance, if there is a problem with the drainage pipeline, the liquid in the equipment cannot be drained smoothly, which increases the difficulty of maintenance and safety hazards. In addition, it is also necessary to manually discharge or replenish methanol in daily work, such as the adjustment of the liquid level of the methanol liquid pump sealing tank in the low-temperature methanol washing system. Excess methanol will be generated during the manual discharge and replenishment of methanol, and these methanol need to be collected. At present, methanol can only be collected and recovered through the underground pipe network, and there is no other recovery device. Excess methanol can only be temporarily stored in a plastic sealed barrel in the warehouse, and then the collected methanol is regularly transported to the water treatment device for unified recovery, which increases safety hazards and brings additional work burden to process personnel.

[0026] Therefore, the present application can provide a complete contaminated methanol recovery system for collecting excess methanol generated in daily work and adding a drainage method so that the equipment can be safely drained and smoothly handed over for maintenance when necessary.

[0027] Example 1

[0028] The present application embodiment provides a system for recovering contaminated methanol, such as Figure 1 As shown, it includes: a liquid storage device, the liquid storage device includes a first liquid storage tank 1 and a second liquid storage tank 2, the first liquid storage tank 1 is connected to the second liquid storage tank 2 through a first pipeline 4, and the first liquid storage tank 1 and the second liquid storage tank 2 are both used to store dirty methanol liquid; a liquid inlet device 3, the liquid inlet device 3 is connected to the first liquid storage tank 1 through a second pipeline 5, and the dirty methanol liquid enters the first liquid storage tank 1 through the liquid inlet device 3; a first valve 10, the first valve 10 is arranged on the first pipeline 4, and is used to control the on-off of the first pipeline 4; the second valve 11, the second valve 11 is arranged on the second pipeline 5, and is used to control the on-off of the second pipeline 5; wherein, the liquid inlet device 3 is located above the first liquid storage tank 1 in the vertical direction, and the first liquid storage tank 1 is located above the second liquid storage tank 2.

[0029] The liquid storage device is composed of a first liquid storage tank 1 and a second liquid storage tank 2, which are connected by a first pipeline 4. The liquid inlet device 3 is used to input dirty methanol liquid into the first liquid storage tank 1. The first valve 10 is installed on the first pipeline 4 connecting the two liquid storage tanks, and the second valve 11 is installed on the second pipeline 5 connecting the liquid inlet device 3 and the first liquid storage tank 1. The liquid inlet device 3 is located above the first liquid storage tank 1, so that the dirty methanol can flow naturally into the first liquid storage tank 1 by gravity. The first liquid storage tank 1 is also located above the second liquid storage tank 2, and the dirty methanol is transferred from the first liquid storage tank 1 to the second liquid storage tank 2 by the same principle of gravity.

[0030] The dirty methanol recovery system provided in the embodiment of the present application first opens the second valve 11 and keeps the first valve 10 closed during the collection of dirty methanol. The dirty methanol is sent into the first liquid storage tank 1 through the liquid inlet device 3 under the action of gravity. By closing the first valve 10, air can be prevented from entering the second liquid storage tank 2 through the liquid inlet device 3, preventing the formation of explosive mixed gas, thereby reducing safety hazards. When the liquid level in the first liquid storage tank 1 reaches a certain height, the second valve 11 is closed, the first valve 10 is opened, and the dirty methanol flows into the second liquid storage tank 2 through the first pipeline 4 under the action of gravity. After the transfer is completed, the first valve 10 is closed. By closing the second valve 11, the toxic and harmful gases inside the second liquid storage tank 2 can be prevented from being released into the surrounding environment through the liquid inlet device 3, reducing the safety risks of process personnel during inspections, and reducing pollution to the environment. The dirty methanol recovery system provided in the embodiment of the present application uses gravity flow instead of pumping, reducing the demand for power equipment, not only reducing energy consumption but also reducing the risk of leakage that may occur during pumping, while reducing the operating steps and improving the safety performance of the entire system.

[0031] In some embodiments, the second liquid storage tank 2 is arranged underground or semi-underground, and the polluted methanol produced by other equipment enters the second liquid storage tank 2 through the underground pipe network 20. A sixth valve 15 is arranged between the underground pipe network 20 and the second liquid storage tank 2 to control the connection and disconnection between the underground pipe network 20 and the second liquid storage tank 2. The liquid inlet device 3, the first liquid storage tank 1, the first valve 10 and the second valve 11 are all arranged on the ground 6.

[0032] The second liquid storage tank 2 can be placed in the pit, so that it is located underground or semi-underground, which can provide better isolation effect and reduce the impact of external factors on the storage tank. The underground or semi-underground arrangement helps to reduce the floor space, and can also reduce heat loss, which helps to maintain the temperature in the storage tank stable.

[0033] The liquid inlet device 3, the first liquid storage tank 1, the first valve 10 and the second valve 11 can be supported on the ground 6 by a frame structure made of carbon steel. For example, the height of the liquid inlet device 3 can be set to 1 meter, which is convenient for technicians to operate and realize on-site daily process maintenance and recovery of excess contaminated methanol. At the same time, a drainage method can be added so that the equipment can be safely drained when necessary and smoothly handed over for maintenance, laying a solid foundation for the stable operation of other equipment.

[0034] In some embodiments, the liquid inlet device 3 includes a device body 301 and a sealing cover 302, wherein the device body 301 has a liquid inlet; the sealing cover 302 is rotatably connected to the device body 301 and is used to seal the liquid inlet.

[0035] The device body 301, as the main component of the liquid inlet device 3, can be a structure such as a cube, a column or a cone, and a liquid inlet is provided on the top or side thereof. The sealing cover 302 is rotatably connected to the device body 301, and the liquid inlet can be opened or closed by rotation to ensure that the liquid inlet can be completely closed when no dirty methanol needs to be added to prevent impurities from entering the system.

[0036] When it is necessary to add dirty methanol to the first liquid storage tank 1, the operator rotates the sealing cover 302 to open the liquid inlet. Connect the pipeline of the container or other conveying device containing dirty methanol to the liquid inlet, and introduce the dirty methanol into the liquid inlet device 3. After the addition is completed, the sealing cover 302 is rotated again to close the liquid inlet to ensure the airtightness of the liquid storage device. The design of the sealing cover 302 can effectively prevent untreated air or impurities from entering the system, reduce the risk of system contamination, and avoid the release of toxic and harmful gases from the system into the surrounding environment, thereby reducing pollution to the environment.

[0037] In some embodiments, the cross-sectional area of ​​the device body 301 gradually decreases along the vertical direction from the liquid inlet.

[0038] The device body 301 can be a conical or similar shaped container, such as a funnel, with a wider top and a narrower bottom. The liquid inlet is located at the top or upper side of the device body 301, and its cross-sectional area gradually decreases as the device body 301 extends downward.

[0039] The operator opens the sealing cover 302 and connects the pipe of the container or other conveying device containing the dirty methanol to the liquid inlet. The dirty methanol liquid enters the device body 301 through the liquid inlet, and then flows downward along the inner wall of the device body 301. Since the cross-sectional area of ​​the device body 301 gradually decreases, it can help guide the dirty methanol liquid to flow smoothly into the first liquid storage tank 1, reduce liquid retention, and increase the flow rate.

[0040] In some embodiments, the contaminated methanol recovery system further includes a first driving device, which is disposed on the device body 301 , and a driving end of the first driving device is connected to the sealing cover 302 for driving the sealing cover 302 to rotate.

[0041] The first drive device can be a power source such as an electric motor, a hydraulic motor or a pneumatic motor, and is installed on the device body 301. The drive end is connected to the sealing cover 302 through a transmission mechanism (such as a gear, a chain or a belt) to realize the automatic opening and closing of the sealing cover 302. The opening and closing process of the sealing cover 302 is automatically controlled to reduce the need for manual intervention, thereby improving the safety and efficiency of the operation. At the same time, the opportunity for the operator to directly contact with harmful substances can be reduced, thereby reducing the risk of accidental exposure.

[0042] In some embodiments, the contaminated methanol recovery system further includes a sealing gasket, which is disposed at the edge of the liquid inlet of the device body 301 or covers the surface of the sealing cover 302 facing the liquid inlet, and the sealing gasket is flexible and insulating.

[0043] The sealing gasket can be arranged at the edge of the liquid inlet of the device body 301, or covered on the surface of the sealing cover 302 facing the liquid inlet. When the sealing cover 302 is closed, the sealing gasket will be compressed to form a tight sealing surface. The sealing gasket can be made of a flexible and insulating material, such as silicone, rubber or Teflon (PTFE). The sealing gasket can increase the sealing between the sealing cover 302 and the device body 301, prevent gas or liquid leakage, and improve the overall safety of the system.

[0044] The flexible sealing gasket can be inserted into the device body 301 through the liquid inlet in the pipeline of other conveying devices, and when the sealing cover 302 is closed, the flexible sealing gasket can seal the connection between the pipeline and the device body 301, and will not over-press the pipeline, ensuring that the liquid can flow smoothly. The sealing gasket has insulating properties, which can prevent the metal sealing cover 302 and the metal device body 301 from metal collision during frequent opening and closing to generate static electricity and sparks, thereby eliminating safety hazards. The sealing gasket can also be anti-corrosive, able to resist corrosion from chemicals such as dirty methanol, and extend its service life. The sealing gasket can be detachable, and once worn or damaged, it can be easily replaced for easy maintenance.

[0045] In some embodiments, the sealing cover 302 and the device body 301 are electrically connected to the ground 6 via wires respectively.

[0046] The connection point between the sealing cover 302 and the device body 301 is selected on the metal part to ensure good conductivity. One end of the wire is connected to the sealing cover 302 or the device body 301, and the other end is connected to the ground 6 or a specially provided grounding device. When handling flammable liquids such as dirty methanol, static discharge may cause fire or explosion. By electrically connecting the sealing cover 302 and the device body 301 to the ground 6 through the wire, static electricity accumulation can be effectively eliminated to prevent safety accidents caused by static electricity discharge.

[0047] In some embodiments, the second liquid storage tank 2 has an air inlet and an air outlet. The air inlet is connected to the gas storage device 16 through a third pipeline 7. The third pipeline 7 is used to introduce the inert gas in the gas storage device 16 into the second liquid storage tank 2. The third pipeline 7 is provided with a third valve 12, and the third valve 12 is used to control the on-off of the third pipeline 7; the air outlet is connected to the gas processing device 17 through a fourth pipeline 8. The fourth pipeline 8 is used to export the gas in the second liquid storage tank 2 to the gas processing device 17 for processing. The fourth pipeline 8 is provided with a fourth valve 13, and the fourth valve 13 is used to control the on-off of the fourth pipeline 8.

[0048] The second liquid storage tank 2 has an air inlet and an air outlet. The air inlet is connected to the gas storage device 16 through the third pipeline 7. The gas storage device 16 can be a nitrogen storage device, which is used to introduce the inert gas (such as nitrogen) in the gas storage device 16 into the second liquid storage tank 2. The air outlet is connected to the gas treatment device 17 through the fourth pipeline 8. The gas treatment device 17 can be a gas combustion device, which is used to guide the gas evaporated from the dirty methanol liquid in the second liquid storage tank 2 to the gas combustion device for combustion, and the heat generated by the combustion can also be recycled. The third valve 12 is installed on the third pipeline 7 to control the introduction of the inert gas. The fourth valve 13 is installed on the fourth pipeline 8 to control the gas from the second liquid storage tank 2 to the gas treatment device 17.

[0049] When the contaminated methanol liquid is introduced from the first liquid storage tank 1 into the second liquid storage tank 2, the third valve 12 can be opened to allow the inert gas to be introduced into the second liquid storage tank 2 through the third pipeline 7. At the same time, the fourth valve 13 is opened. After the inert gas enters the second liquid storage tank 2, it can push the impurity gas from the first liquid storage tank 1 into the second liquid storage tank 2 and the gas evaporated from the contaminated methanol liquid to be discharged through the fourth pipeline 8 to the gas treatment device 17 for treatment.

[0050] By filling the second liquid storage tank 2 with inert gas, the oxygen content in the storage tank can be reduced, reducing the risk of explosion or fire. The derived gas is processed by the gas processing device 17 to remove harmful components and reduce the impact on the environment. The pressure in the storage tank can be controlled by charging and discharging the inert gas, keeping the pressure in the storage tank stable, which helps to improve the operational stability of the system.

[0051] In some embodiments, the contaminated methanol recovery system also includes a fifth pipeline 9, and the second liquid storage tank 2 is connected to the methanol regeneration device 18 through the fifth pipeline 9; a second driving device 19, the second driving device 19 is arranged on the fifth pipeline 9, and is used to drive the liquid in the second liquid storage tank 2 to be introduced into the methanol regeneration device 18; the fifth valve 14, the fifth valve 14 is arranged on the fifth pipeline 9, and is used to control the opening and closing of the fifth pipeline 9.

[0052] The fifth pipeline 9 connects the second liquid storage tank 2 with the methanol regeneration device 18. The methanol regeneration device 18 can be a methanol water separation tower. After distillation separation and further distillation in the regeneration tower, the clean methanol is returned to the equipment for reuse, which not only improves the utilization rate of industrial raw materials and the safety of the site, but also achieves the purpose of reducing costs and increasing efficiency. The second drive device 19 is installed on the fifth pipeline 9, which is used to drive the liquid in the second liquid storage tank 2 to be introduced into the methanol regeneration device 18 through the fifth pipeline 9. The second drive device 19 can be a pump, a compressor or other types of drive devices. The fifth valve 14 is installed on the fifth pipeline 9 to control the on and off of the fifth pipeline 9 to ensure that the liquid is transported as needed.

[0053] When it is necessary to transport the liquid in the second liquid storage tank 2 to the methanol regeneration device 18, the fifth valve 14 is opened, the second drive device 19 is started, and under the action of the second drive device 19, the liquid is transported from the second liquid storage tank 2 to the methanol regeneration device 18 through the fifth pipeline 9. After the transportation is completed, the fifth valve 14 is closed and the second drive device 19 is stopped. By introducing the fifth pipeline 9, the second drive device 19 and the fifth valve 14, not only the efficiency and safety of the contaminated methanol recovery system can be improved, but also the effective control of the transportation process can be achieved, thereby improving the performance and economy of the entire system.

[0054] In some embodiments, the contaminated methanol recovery system further includes a liquid level detection device, which is connected to the first liquid storage tank 1 and is used to detect the liquid level height in the first liquid storage tank 1 .

[0055] The liquid level detection device can be an existing detection technology such as a float level gauge, an ultrasonic level gauge, a radar level gauge, a capacitive level gauge, etc. It can be installed on the top or side of the first liquid storage tank 1, and directly contact or non-contact measure the liquid inside the first liquid storage tank 1. The liquid level detection device can sound an alarm when the liquid level exceeds a predetermined range to remind the operator to take measures. By real-time monitoring of the liquid level height in the first liquid storage tank 1, overfilling or over-emptiness can be avoided, and the risk of leakage and overflow can be reduced. Real-time monitoring of the liquid level can help optimize the process of liquid filling and liquid discharge, and improve the processing efficiency of the entire system.

[0056] In some embodiments, a visual window may be provided on the side wall of the first liquid storage tank 1 to facilitate technicians to intuitively obtain the liquid level height in the first liquid storage tank 1 .

[0057] In some embodiments, the contaminated methanol recovery system also includes a control device, which is respectively communicated with the liquid level detection device, the first valve 10, and the second valve 11, and the control device controls the switching of the first valve 10 and the second valve 11 according to the detection data of the liquid level detection device; the first valve 10 and the second valve 11 are both electric valves.

[0058] The control device can be a PLC (Programmable Logic Controller), a microprocessor or other type of controller, which is used to receive data from the liquid level detection device and make corresponding control decisions accordingly. The control device can communicate with the liquid level detection device, the first valve 10 and the second valve 11 in a wired or wireless manner.

[0059] The liquid level detection device monitors the liquid level in the first liquid storage tank 1 in real time and sends the data to the control device. The first valve 10 and the second valve 11 are both electric valves, which can be automatically opened or closed by the command of the control device. The electric valve can be a solenoid valve, an electric ball valve or other suitable electric valve types.

[0060] When the liquid level detection device detects that the liquid level in the first liquid storage tank 1 reaches the set height, it will send this information to the control device. After receiving the information, the control device will automatically close the second valve 11 to prevent more dirty methanol liquid from entering the first liquid storage tank 1. At the same time, the control device will open the first valve 10 to allow the liquid in the first liquid storage tank 1 to flow into the second liquid storage tank 2. When the liquid level in the first liquid storage tank 1 drops below the set safety level, the control device will close the first valve 10 and reopen the second valve 11 to allow new dirty methanol liquid to enter the first liquid storage tank 1. By automatically controlling the opening and closing of the valve, overflow or leakage caused by overfilling of the first liquid storage tank 1 can be avoided, safety hazards can be reduced, and the automation of liquid level detection and valve control can be realized, which reduces the workload of operators and improves operating efficiency.

[0061] In some embodiments, the third valve 12, the fourth valve 13, the fifth valve 14 and the sixth valve 15 can all be electric valves electrically connected to the control device. Through the control device, technicians can remotely control the opening and closing of each valve, which can reduce the workload of operators and improve operating efficiency.

[0062] The control device is connected by communication with the third valve 12 and the fourth valve 13. When the contaminated methanol enters the second liquid storage tank 2 from the first liquid storage tank 1, the third valve 12 and the fourth valve 13 can be opened. This can not only discharge the impurity gas and methanol vapor in the second liquid storage tank 2 to improve safety, but also reduce the pressure in the second liquid storage tank 2 and improve the efficiency of recovering the contaminated methanol liquid.

[0063] The contaminated methanol recovery system provided in the embodiment of the present application realizes a safe, efficient and environmentally friendly contaminated methanol recovery process through reasonable valve control and utilization of gravity flow.

[0064] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art who is familiar with the present technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A contaminated methanol recovery system, characterized in that: include: A liquid storage device, the liquid storage device comprising a first liquid storage tank and a second liquid storage tank, the first liquid storage tank and the second liquid storage tank are connected through a first pipeline, and the first liquid storage tank and the second liquid storage tank are both used to store dirty methanol liquid; A liquid inlet device, wherein the liquid inlet device is connected to the first liquid storage tank through a second pipeline, and the dirty methanol liquid enters the first liquid storage tank through the liquid inlet device; A first valve, which is disposed on the first pipeline and is used to control the on-off of the first pipeline; A second valve, which is disposed on the second pipeline and is used to control the on-off of the second pipeline; Wherein, the liquid inlet device is located above the first liquid storage tank in the vertical direction, and the first liquid storage tank is located above the second liquid storage tank.

2. The contaminated methanol recovery system according to claim 1, characterized in that: The liquid inlet device comprises a device body and a sealing cover, and the device body has a liquid inlet; The sealing cover is rotatably connected to the device body and is used to seal the liquid inlet.

3. The contaminated methanol recovery system according to claim 2, characterized in that: The cross-sectional area of ​​the device body gradually decreases from the liquid inlet along the vertical direction.

4. The contaminated methanol recovery system according to claim 2, characterized in that: Also includes: A first driving device is provided on the device body, and a driving end of the first driving device is connected to the sealing cover for driving the sealing cover to rotate.

5. The contaminated methanol recovery system according to claim 2, characterized in that: Also includes: A sealing gasket is arranged at the edge of the liquid inlet of the device body, or covers the surface of the sealing cover facing the liquid inlet, and the sealing gasket has flexibility and insulation properties.

6. The contaminated methanol recovery system according to claim 1, characterized in that: The second liquid storage tank has an air inlet and an air outlet, the air inlet is connected to the gas storage device through a third pipeline, the third pipeline is used to introduce the inert gas in the gas storage device into the second liquid storage tank, and a third valve is provided on the third pipeline, and the third valve is used to control the on and off of the third pipeline; The gas outlet is connected to the gas processing device through a fourth pipeline, and the fourth pipeline is used to export the gas in the second liquid storage tank to the gas processing device for processing. A fourth valve is provided on the fourth pipeline, and the fourth valve is used to control the on-off of the fourth pipeline.

7. The contaminated methanol recovery system according to claim 1, characterized in that: Also includes: a fifth pipeline, through which the second liquid storage tank is connected to the methanol regeneration device; a second driving device, the second driving device being disposed on the fifth pipeline and used for driving the liquid in the second liquid storage tank to be introduced into the methanol regeneration device; A fifth valve is provided on the fifth pipeline and is used for controlling the on-off of the fifth pipeline.

8. The contaminated methanol recovery system according to claim 1, characterized in that: Also includes: A liquid level detection device is connected to the first liquid storage tank and is used to detect the liquid level height in the first liquid storage tank.

9. The contaminated methanol recovery system according to claim 8, characterized in that: Also includes: A control device, wherein the control device is respectively connected to the liquid level detection device, the first valve, and the second valve for communication, and the control device controls the opening and closing of the first valve and the second valve according to the detection data of the liquid level detection device; The first valve and the second valve are both electric valves.

10. The contaminated methanol recovery system according to claim 2, characterized in that: The sealing cover and the device body are electrically connected to the ground through wires respectively.

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