Anti-polymerization and anti-solidification acrylic acid storage system

Abstract

According to the anti-polymerization and anti-solidification acrylic acid storage system, one end of an unloading line is connected to a feeding opening of an acrylic acid storage tank, the other end of the unloading line is in butt joint with a tank car, and a first stop valve, an acrylic acid unloading pump and a second stop valve are sequentially installed on the unloading line according to the feeding sequence; one end of the conveying pipeline is connected to a discharging port of the acrylic acid storage tank, the other end of the conveying pipeline is connected to a user port, an acrylic acid conveying pump and a third stop valve are installed on the conveying pipeline, and the third stop valve is relatively close to the user port; a backflow pipeline of the external circulation cooler is connected to a backflow opening of the acrylic acid storage tank, one end of the large circulation pipeline and the unloading line are connected to a second point, the other end of the large circulation pipeline and the conveying pipeline are connected to a third point, and the second point on the unloading line is close to the second stop valve and located behind the second stop valve. A third point on the delivery line is proximate to and before the third shut-off valve.

Description

Technical Field

[0001] The present invention relates to the technical field of petrochemical storage and transportation, and particularly relates to an acrylic acid storage system for preventing polymerization and solidification. Background Art

[0002] Due to the vinyl and carboxyl functional groups contained in acrylic acid monomers, their reaction activity is high, and they are prone to polymerization reactions during storage and production, blocking equipment and pipelines, which has an adverse impact on the transportation and production of acrylic acid. The polymerization reaction is an exothermic reaction. If not controlled, the temperature will continue to rise, resulting in explosive polymerization in the storage tank, continuous increase in pressure, and even accidents in severe cases.

[0003] Therefore, the storage of acrylic acid needs to consider process measures to avoid self-polymerization.

[0004] On the other hand, the freezing point of acrylic acid is 13°C, and it is prone to solidification during storage in the northern winter environment. While maintaining low-temperature storage, solidification should be avoided. Summary of the Invention

[0005] The present application provides an acrylic acid storage system for preventing polymerization and solidification, which solves the technical problems of the technical difficulties of easy polymerization and easy solidification existing in the storage and transportation of acrylic acid in the prior art.

[0006] The present application provides an acrylic acid storage system for preventing polymerization and solidification, including an acrylic acid storage tank, a truck unloading line, a conveying pipeline, an external circulation cooler, and a large circulation pipeline. One end of the truck unloading line is connected to the feed port of the acrylic acid storage tank, and the other end of the truck unloading line is docked with a tank truck. A first cut-off valve, an acrylic acid unloading pump, and a second cut-off valve are sequentially installed on the truck unloading line according to the feeding sequence; one end of the conveying pipeline is connected to the discharge port of the acrylic acid storage tank, and the other end of the conveying pipeline is connected to a user port. An acrylic acid conveying pump and a third cut-off valve are installed on the conveying pipeline, and the third cut-off valve is relatively close to the user port; the external circulation cooler is arranged outside the acrylic acid storage tank. The feed pipeline of the external circulation cooler is connected to the conveying pipeline at a first point, and the return pipeline of the external circulation cooler is connected to the return port of the acrylic acid storage tank; one end of the large circulation pipeline is connected to the truck unloading line at a second point, and the other end of the large circulation pipeline is connected to the conveying pipeline at a third point. On the truck unloading line, the second point is close to the second cut-off valve and is located after the second cut-off valve. On the conveying pipeline, the third point is close to the third cut-off valve and is located before the third cut-off valve.

[0007] In some embodiments, a gas seal system, a breather valve, and an emergency relief manhole are provided on the top of the acrylic storage tank. The breather valve and the emergency relief manhole are respectively connected to the acrylic storage tank. The gas seal system includes a pressure transmitter, an air main pipeline, and a pressure regulating valve. The pressure transmitter is connected to the top of the acrylic storage tank to obtain the real-time pressure value inside the tank. The air main pipeline is connected to the acrylic storage tank, and the pressure regulating valve is installed on the air main pipeline. The pressure transmitter is connected to the control port of the pressure regulating valve.

[0008] In some embodiments, the gas seal system further includes a bypass pipeline connected in parallel with the pressure regulating valve. Both ends of the bypass pipeline are connected to the air main pipeline, and a flow-limiting orifice plate is provided on the bypass pipeline.

[0009] In some embodiments, the acrylic storage tank is further connected with a gas-phase balance line. One end of the gas-phase balance line is used to communicate with the tank truck, and a switch valve is provided on the gas-phase balance line.

[0010] In some embodiments, the external circulation cooler includes a low-temperature water pipeline connected to the body. A temperature regulating valve is installed on the low-temperature water pipeline, and a temperature transmitter is installed on the tank wall of the acrylic storage tank. The temperature transmitter is connected to the control port of the temperature regulating valve.

[0011] In some embodiments, the cooling medium of the external circulation cooler is an aqueous solution at 15 °C, and the temperature inside the acrylic storage tank is maintained at 20 ± 5 °C.

[0012] In some embodiments, nozzles are provided inside the acrylic storage tank. The discharging direction of the nozzles is inclined upward, and the nozzles are installed at the reflux port of the acrylic storage tank.

[0013] In some embodiments, the external circulation cooler is arranged at a certain slope to ensure that the materials inside the equipment are effectively drained during discharging.

[0014] In some embodiments, the acrylic storage system includes a first pressure feeding line, a second pressure feeding line, and a third pressure feeding line. The third pressure feeding line and the unloading line are connected before the first cut-off valve. The connection point of the third pressure feeding line and the unloading line is close to the end of the unloading line where it docks with the tank truck. The first pressure feeding line and the unloading line are connected between the acrylic unloading pump and the second cut-off valve. The second pressure feeding line and the conveying pipeline are connected between the third cut-off valve and the user port.

[0015] In some embodiments, a tuning fork level gauge is installed on the unloading line. The installation position of the tuning fork level gauge on the unloading line is between the pump outlet of the acrylic unloading pump and the second cut-off valve. The tuning fork level gauge is interlocked with the acrylic unloading pump and the first cut-off valve.

[0016] In some embodiments, the acrylic acid storage system includes a sight glass installed on a sight glass pipeline, the sight glass pipeline is connected to the unloading line, the sight glass pipeline is connected to the pump drain port, and the sight glass pipeline is connected to the acrylic acid storage tank. The pump drain port and the sight glass at the low point of the pipeline are used to determine whether the material is blown clean.

[0017] In some embodiments, the pipelines through which the liquid phase passes in the acrylic acid storage system are all heated by hot water and are insulated. The pipelines through which the liquid phase passes include but are not limited to unloading lines, feed lines and return lines of external circulation coolers, conveying pipelines, and large circulation pipelines.

[0018] The beneficial effects of the present application are as follows: an anti-polymerization and anti-solidification acrylic acid storage system is provided, comprising an acrylic acid storage tank, an unloading line, a conveying pipeline, an external circulation cooler and a large circulation pipeline. By arranging an external circulation cooling system and a large circulation pipeline system, the acrylic acid in the storage tank is cooled while the system is kept in a flowing state, thereby avoiding polymerization blockage caused by accumulation of stored liquid when the acrylic acid is not flowing, and solving the problem that acrylic acid is easy to polymerize and solidify during transportation and production. The system has a simple process and complete functions, and the anti-polymerization and anti-solidification strategies are scientific, safe and effective, and it has extremely high applicability, meets the storage needs of acrylic acid, and has wide application value in acrylic acid storage. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for describing the embodiments are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention.

[0020] Figure 1 A schematic diagram of an anti-polymerization and anti-solidification acrylic acid storage system provided in the present application.

[0021] Figure markings: P-101-acrylic acid unloading pump, T-101-acrylic acid storage tank, E-101-external circulation cooler, P-102-acrylic acid delivery pump, 1-1-first shut-off valve, 1-2-second shut-off valve, 1-3-third shut-off valve, 2-1-first pressing line, 2-2-second pressing line, 2-3-third pressing line, 2-4-air main line, 2-5-gas phase balance line, 3-1-reflux line, 3-2-large circulation line, 3-3-delivery line, 4-tuning fork level gauge, 5-sight mirror, 6-breathing valve, 7-emergency discharge manhole, 8-pressure transmitter, 9-pressure regulating valve, 10-flow limiting orifice, 11-temperature transmitter, 12-temperature regulating valve, 13-nozzle, 14-1-first point, 14-2-second point, 14-3-third point. DETAILED DESCRIPTION

[0022] Please refer to Figure 1, this embodiment discloses an acrylic storage system for preventing polymerization and solidification, simply referred to as this system, and realizes the storage requirement of acrylic through this system.

[0023] As Figure 1 shown, this system includes an acrylic storage tank T-101. The acrylic storage tank T-101 serves as a storage device for acrylic, and it is necessary to transfer acrylic from the tank truck to the acrylic storage tank T-101.

[0024] This system includes a unloading line. As Figure 1 shown, one end of the unloading line is connected to the feed port of the acrylic storage tank T-101, and the other end of the unloading line is docked with the tank truck. A first cut-off valve 1-1, an acrylic unloading pump P-101, and a second cut-off valve 1-2 are sequentially installed on the unloading line according to the feeding sequence. The on / off of the unloading line before the pump is controlled by the first cut-off valve 1-1, and the on / off of the unloading line after the pump is controlled by the second cut-off valve 1-2. After the acrylic is hermetically unloaded, it is transported to the acrylic storage tank T-101 by the acrylic unloading pump P-101. In this embodiment, the acrylic unloading pump P-101 is selected as a centrifugal pump to ensure that the material in the pipeline is discharged into the acrylic storage tank T-101 as much as possible.

[0025] This system includes a transfer pipeline 3-3. As Figure 1 shown, one end of the transfer pipeline 3-3 is connected to the discharge port of the acrylic storage tank T-101, and the other end of the transfer pipeline 3-3 is connected to the user port. When there is a corresponding user demand, the acrylic in the storage tank is transferred along the transfer pipeline 3-3 to the user port. An acrylic transfer pump P-102 and a third cut-off valve 1-3 are installed on the transfer pipeline 3-3. The transfer power is provided by the acrylic transfer pump P-102, and the on / off of the pipeline is controlled by the third cut-off valve 1-3. Among them, the third cut-off valve 1-3 is relatively close to the user port, and the acrylic transfer pump P-102 is relatively close to the acrylic storage tank T-101.

[0026] This system includes an external circulation cooler E-101. As Figure 1 shown, the external circulation cooler E-101 is arranged outside the acrylic storage tank T-101. The external circulation cooler E-101 has a feed pipeline, a return pipeline 3-1, and a low-temperature water pipeline. The low-temperature water pipeline is used for the circulation of the cooling medium. The low-temperature water pipeline includes a cooling medium inlet pipe and a cooling medium outlet pipe. The cooling medium enters the body of the external circulation cooler E-101 from the cooling medium outlet pipe and is output from the cooling medium inlet pipe. Through the external circulation cooler E-101, the acrylic exchanges heat with the cooling medium, cools the acrylic outside the tank, and then returns to the acrylic storage tank T-101 after cooling.

[0027] As Figure 1As shown, the feed pipeline of the external circulation cooler E-101 is connected to the transfer pipeline 3-3 and is connected at the first point 14-1. The reflux pipeline 3-1 of the external circulation cooler E-101 is connected to the reflux port of the acrylic acid storage tank T-101. Acrylic acid is cooled by heat exchange outside the body through the external circulation cooler E-101 and returns to the storage tank through the reflux pipeline 3-1. The circulating flow rate is controlled to be <0.5 m / s, and heat exchange is carried out with the acrylic acid in the storage tank to maintain the storage temperature of the material in the storage tank at about 20°C. The cooling medium of the external circulation cooler E-101 can use an ethylene glycol aqueous solution.

[0028] This system includes a large circulation pipeline 3-2, as Figure 1 shown. One end of the large circulation pipeline 3-2 is connected to the unloading line at the second point 14-2, and the other end of the large circulation pipeline 3-2 is connected to the transfer pipeline 3-3 at the third point 14-3. It is defined that the second point 14-2 on the unloading line is close to the second cut-off valve 1-2, and in the feeding direction of the unloading line, the second point 14-2 is located behind the second cut-off valve 1-2. On the transfer pipeline 3-3, the third point 14-3 is close to the third cut-off valve 1-3, and in the feeding direction of the transfer pipeline 3-3, the third point 14-3 is located in front of the third cut-off valve 1-3.

[0029] By setting the large circulation pipeline 3-2, it is ensured that the entire system is always in a flowing circulation state, avoiding polymerization blockage caused by the accumulation of liquid when acrylic acid does not flow. The flow rate of the acrylic acid transfer pump P-102 takes into account three parts of the flow rate, namely the user consumption + the external cooling circulation volume + the large circulation volume.

[0030] Correspondingly, all branch pipeline valves are required to be the shortest distance from the main pipeline, and dead ends should be avoided as much as possible.

[0031] In some embodiments, a gas seal system, a breather valve 6 and an emergency relief manhole 7 are provided on the top of the acrylic acid storage tank T-101 to implement a three-level pressure protection measure for the storage tank. The breather valve 6 and the emergency relief manhole 7 are respectively connected to the acrylic acid storage tank T-101.

[0032] The gas seal system includes a pressure transmitter 8, an air main pipeline 2-4 and a pressure regulating valve 9. The pressure transmitter 8 is connected to the top of the acrylic acid storage tank T-101 to obtain the real-time pressure value in the tank. The air main pipeline 2-4 is connected to the acrylic acid storage tank T-101. The pressure regulating valve 9 is installed on the air main pipeline 2-4, and the pressure transmitter 8 is connected to the control port of the pressure regulating valve 9. Among them, the pressure value in the gas phase space of the acrylic acid storage tank T-101 is obtained through the pressure transmitter 8. The opening and closing of the pressure regulating valve 9 are controlled by the change of the pressure on the top of the tank. In this embodiment, the gas phase space pressure in the tank is controlled at about 1 kPaG through the pressure transmitter 8.

[0033] When the pressure is below 0.5 kPaG, the pressure regulating valve 9 opens, and air enters the storage tank through the main air pipeline 2-4. When the pressure is above 1.3 kPaG, the pressure regulating valve 9 closes, and air stops entering the storage tank.

[0034] When the pressure inside the storage tank continues to rise to a certain pressure value, the breather valve 6 opens; when the pressure inside the storage tank continues to rise to another larger pressure value, the emergency relief manhole 7 opens; in cooperation with the gas seal system, thus realizing the three-level pressure protection of the storage tank.

[0035] In some embodiments, the gas seal system further includes a bypass pipeline connected in parallel with the pressure regulating valve 9. Both ends of the bypass pipeline are connected to the main air pipeline 2-4, and a flow-limiting orifice plate 10 is provided on the bypass pipeline as a backup means when the pressure regulating valve 9 fails.

[0036] In some embodiments, the acrylic acid storage tank T-101 is further connected with a gas phase balance line 2-5. One end of the gas phase balance line 2-5 is used to communicate with the tank truck, and a shut-off valve is provided on the gas phase balance line 2-5. When unloading the truck, the gas phase balance line 2-5 is opened. As the tank is continuously filled with material, the gas phase pressure at the top of the tank rises and returns to the tank truck, maintaining the gas phase pressure balance between the storage tank and the tank truck.

[0037] In some embodiments, as Figure 1 shown, the external circulation cooler E-101 includes a low-temperature water pipeline connected to the body. A temperature regulating valve 12 is installed on the low-temperature water pipeline, and a temperature transmitter 11 is installed on the tank wall of the acrylic acid storage tank T-101. The temperature transmitter 11 measures the temperature of the liquid inside the tank, and the temperature transmitter 11 is connected to the control port of the temperature regulating valve 12. Among them, the temperature regulating valve 12 and the temperature transmitter 11 form a temperature control loop. By adjusting the opening degree of the temperature regulating valve 12, the flow rate of the cooling medium is adjusted, and further the temperature of the material inside the storage tank is regulated. In some embodiments, the cooling medium uses an aqueous solution at 15 °C to maintain the temperature inside the storage tank at 20 ± 5 °C.

[0038] In some embodiments, as Figure 1 shown, a nozzle 13 is provided inside the acrylic acid storage tank T-101. The discharging direction of the nozzle 13 is inclined upward, and the nozzle 13 is installed at the reflux port of the acrylic acid storage tank T-101. Figure 1 What is shown in [reference] is that the nozzle 13 is installed on the pipeline. By arranging the nozzle 13 inclined upward on the inner side where the bottom reflux port of the storage tank is located, the material is continuously sprayed into the tank, increasing the agitation of the acrylic acid inside the tank, playing a role in mixing and stirring the acrylic acid inside the tank, and avoiding polymerization when the acrylic acid inside the tank does not flow.

[0039] In some embodiments, as Figure 1As shown, the external circulation cooler E-101 is set at a certain slope. Designing the external circulation cooler E-101 in a form with a certain slope can ensure that the materials in the equipment are effectively drained during discharging.

[0040] In some embodiments, the acrylic storage system includes a first pressure feeding line 2-1, a second pressure feeding line 2-2, and a third pressure feeding line 2-3; the third pressure feeding line 2-3 is connected to the unloading line before the first cut-off valve 1-1, and the connection point of the third pressure feeding line 2-3 and the unloading line is close to the end of the unloading line where it docks with the tank car; the first pressure feeding line 2-1 is connected to the unloading line between the acrylic unloading pump P-101 and the second cut-off valve 1-2; the second pressure feeding line 2-2 is connected to the conveying pipeline 3-3 between the third cut-off valve 1-3 and the user port.

[0041] After the unloading is completed, close the second cut-off valve 1-2, and use the first pressure feeding line 2-1 and the third pressure feeding line 2-3 to press the hydraulic pressure stored in the pipeline and the pump into the acrylic storage tank T-101, and control the pressure feeding pressure within a certain range for 1 - 2 minutes.

[0042] During the production process, the acrylic conveying pump P-102 feeds materials to the downstream device. After the feeding is completed, close the third cut-off valve 1-3, and use the second pressure feeding line 2-2 to press the stored materials in the pipeline behind the valve into the downstream device to keep no acrylic remaining in the pipeline system.

[0043] The gas phase generated during unloading and pressure feeding enters the corresponding acrylic tail gas recovery system. When the gas phase materials generated during unloading and pressure feeding exceed the set pressure of the breather valve 6, they enter the corresponding tail gas recovery system.

[0044] In the pressure feeding line, the pressure feeding gas is selected as clean air. The presence of oxygen has an inhibiting effect on acrylic polymerization, avoiding the remaining acrylic materials in the pipeline in a static state.

[0045] In some embodiments, please refer to Figure 1 , this system includes a sight glass 5. The sight glass 5 is installed on the sight glass 5 pipeline. The sight glass 5 pipeline is connected to the unloading line, the pump drain port, and the acrylic storage tank T-101. Determine whether the materials are blown out through the sight glass 5 at the pump drain port and the low point of the pipeline. After the first pressure feeding line 2-1 and the third pressure feeding line 2-3 work, control the pressure feeding pressure within a certain range for 1 - 2 minutes. If no liquid phase materials pass through the sight glass 5 at the pump drain port and the low point of the pipeline, it is determined that the materials have been blown out.

[0046] In some embodiments, please refer to Figure 1The tuning fork level gauge 4 is installed on the unloading line. The installation position of the tuning fork level gauge 4 on the unloading line is between the pump outlet of the acrylic unloading pump P-101 and the second shut-off valve 1-2. The tuning fork level gauge 4 is interlocked with the acrylic unloading pump P-101, and the tuning fork level gauge 4 is interlocked with the first shut-off valve 1-1. The tuning fork level gauge 4 located at the outlet of the unloading pump detects the presence of gas phase in the pipeline, and then determines that the liquid delivery in the pipeline before the pump is completed, interlocks and shuts down the acrylic unloading pump P-101, and interlocks and closes the first shut-off valve 1-1.

[0047] In some embodiments, the pipelines in the acrylic acid storage system through which the liquid phase passes are all heated by hot water and insulated by cold water. Figure 1 As shown by the dotted lines in the figure, there are pipelines through which the liquid phase passes during the operation of this system, including but not limited to the unloading line, the feed line and the reflux line of the external circulation cooler, the conveying pipeline 3-3 and the large circulation pipeline 3-2, to avoid the crystallization and solidification of acrylic acid when the ambient temperature is low.

[0048] The anti-polymerization and anti-solidification acrylic acid storage system of the present invention has been applied to many domestic acrylic acid and ester production devices, and fully meets the process requirements for acrylic acid storage. Practical application proves that the anti-polymerization and anti-solidification strategy is scientific, safe, and effective, and has universal application.

[0049] In summary, the external circulation cooling system and large circulation piping system in this system can cool down the acrylic acid in the storage tank while keeping the system in a flowing state, avoiding polymerization blockage caused by accumulation of liquid when acrylic acid is not flowing, and solving the problem of easy polymerization and solidification of acrylic acid during transportation and production. The acrylic acid storage tank T-101 is equipped with an air sealing system, a breathing valve 6, and an emergency discharge manhole 7 to implement the three-level pressure protection measures of the storage tank. The pressure of the storage tank during normal operation is adjusted by the pressure control of the air sealing system. A temperature control system is set at the bottom of the storage tank, and the amount of external circulation cooling medium is adjusted by the temperature regulating valve 12, thereby controlling the storage temperature of acrylic acid in the storage tank to maintain at 20±5℃. This process is simple, fully functional, and the anti-polymerization and anti-solidification strategies are scientific, safe, and effective. It has extremely high applicability and has a wide range of application value in acrylic acid storage.

[0050] Although the preferred embodiments of the present invention have been described, those skilled in the art may make other changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the present invention.

[0051] Obviously, those skilled in the art can make various modifications and variations to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalent technologies, the present invention also intends to include these modifications and variations.

Claims

1. An acrylic storage system for preventing polymerization and solidification, characterized in that, The acrylic acid storage system includes: An acrylic acid storage tank; A truck unloading line, one end of which is connected to the feed port of the acrylic acid storage tank, and the other end is docked with a tank truck. A first cut-off valve, an acrylic acid unloading pump and a second cut-off valve are sequentially installed on the truck unloading line according to the feeding sequence; A conveying pipeline, one end of which is connected to the discharge port of the acrylic acid storage tank, and the other end is connected to a user port. An acrylic acid conveying pump and a third cut-off valve are installed on the conveying pipeline, and the third cut-off valve is relatively close to the user port; An external circulation cooler, which is arranged outside the acrylic acid storage tank. The feed pipeline of the external circulation cooler is connected to the conveying pipeline at a first point, and the return pipeline of the external circulation cooler is connected to the return port of the acrylic acid storage tank; A large circulation pipeline, one end of which is connected to the truck unloading line at a second point, and the other end is connected to the conveying pipeline at a third point. On the truck unloading line, the second point is close to and behind the second cut-off valve, and on the conveying pipeline, the third point is close to and in front of the third cut-off valve.

2. The acrylic acid storage system according to claim 1, wherein A gas sealing system, a breather valve and an emergency relief manhole are arranged on the top of the acrylic acid storage tank, and the breather valve and the emergency relief manhole are respectively communicated with the acrylic acid storage tank; The gas sealing system includes a pressure transmitter, an air main pipeline and a pressure regulating valve. The pressure transmitter is connected to the top of the acrylic acid storage tank to obtain the real-time pressure value in the tank. The air main pipeline is connected to the acrylic acid storage tank, and the pressure regulating valve is installed on the air main pipeline. The pressure transmitter is connected to the control port of the pressure regulating valve.

3. The acrylic acid storage system according to claim 2, wherein The gas sealing system further includes a bypass pipeline connected in parallel with the pressure regulating valve. Both ends of the bypass pipeline are communicated with the air main pipeline, and a flow-limiting orifice plate is arranged on the bypass pipeline.

4. The acrylic acid storage system according to claim 1, wherein The acrylic acid storage tank is also connected with a gas phase balance line. One end of the gas phase balance line is used to conduct with the tank truck, and a switch valve is arranged on the gas phase balance line.

5. The acrylic acid storage system according to claim 1, characterized in that, The external circulation cooler includes a low-temperature water pipeline connected to the body of the cooler. A temperature regulating valve is installed on the low-temperature water pipeline, and a temperature transmitter is installed on the tank wall of the acrylic acid storage tank. The temperature transmitter is connected to the control port of the temperature regulating valve.

6. The acrylic acid storage system according to claim 1, wherein Nozzles are arranged inside the acrylic acid storage tank. The discharging direction of the nozzles is inclined upward, and the nozzles are installed at the return port of the acrylic acid storage tank.

7. The acrylic acid storage system according to any one of claims 1-6, characterized in that, The acrylic acid storage system includes a first pressure feeding line, a second pressure feeding line and a third pressure feeding line; The third pressure feeding line is connected to the truck unloading line before the first cut-off valve, and the connection point of the third pressure feeding line and the truck unloading line is close to the end of the truck unloading line docked with the tank truck; The first pressure feeding line is connected to the truck unloading line between the acrylic acid unloading pump and the second cut-off valve; The second pressure feeding line is connected to the conveying pipeline between the third cut-off valve and the user port.

8. The acrylic acid storage system according to claim 1, wherein A tuning fork level gauge is installed on the truck unloading line, and the installation position of the tuning fork level gauge on the truck unloading line is between the pump outlet of the acrylic acid unloading pump and the second cut-off valve; The tuning fork level gauge is interlocked with the acrylic unloading pump, and the tuning fork level gauge is interlocked with the first cut-off valve.

9. The acrylic acid storage system according to claim 1, wherein The acrylic storage system includes a sight glass, which is installed on the sight glass pipeline. The sight glass pipeline is connected to the unloading line, the pump drain port, and the acrylic storage tank. Whether the material is blown out is judged through the sight glasses at the pump drain port and the low point of the pipeline.

10. The acrylic acid storage system according to claim 1, wherein, For the pipelines through which the liquid phase in the acrylic storage system passes, hot water tracing and cold insulation measures are taken. The pipelines through which the liquid phase passes include, but are not limited to, the unloading line, the feed pipeline and the reflux pipeline of the external circulation cooler, the conveying pipeline and the large circulation pipeline.

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