Vinyl acetate storage system

Abstract

The utility model relates to the technical field of vinyl acetate storage equipment, in particular to a vinyl acetate storage system which comprises a vinyl acetate storage tank, a storage tank jacket is sleeved outside the vinyl acetate storage tank, and a cooling cavity is arranged between the inner wall of the storage tank jacket and the outer wall of the vinyl acetate storage tank. The storage tank jacket is connected with a cooling liquid inlet pipe and a cooling liquid outlet pipe which are communicated with the cooling cavity; the vinyl acetate storage tank is connected with a nitrogen inlet pipeline, and a nitrogen pressure regulating valve is arranged on the nitrogen inlet pipeline; and the vinyl acetate storage tank is connected with a discharge pipeline. According to the utility model, the refrigerant fluid is circularly introduced, so that the low-temperature storage of vinyl acetate in the vinyl acetate storage tank is kept, the consumption of the refrigerant fluid is reduced, and the influence on the surrounding storage environment is reduced; when vinyl acetate is stored, the risk that vinyl acetate and air are mixed is effectively solved through the nitrogen sealing effect, meanwhile, pressure can be supplemented after the air pressure in the vinyl acetate storage tank is reduced, and the discharging air pressure of vinyl acetate is ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of vinyl acetate storage equipment, in particular to a vinyl acetate storage system. Background Art

[0002] Vinyl acetate, also known as vinyl acetate, is an organic compound with the molecular formula C4H6O2. It is a colorless, flammable liquid with a sweet ethereal smell. It is mainly used to synthesize vinylon and is also used as a chemical reagent in the adhesive and coating industries. It is generally stored and transported in special storage tanks.

[0003] Vinyl acetate plays an extremely important role as a chemical raw material in the chemical industry. However, it is a toxic, harmful, flammable and explosive medium, which results in extremely harsh storage conditions. When mixed with air, there is an explosion risk of 2.6% to 13.4% (volume). If the storage temperature is too high, it will decompose to produce acetic acid, and there is a risk of spontaneous combustion.

[0004] The storage temperature of vinyl acetate is generally controlled below 30°C. In summer or other places with high temperatures, the vinyl acetate in the storage tank will be at high temperature and the air pressure in the storage tank will increase, which may lead to the risk of explosion. At the same time, the increase in temperature will accelerate the self-polymerization of vinyl acetate, resulting in an uncontrolled polymerization reaction, which will generate greater pressure on the storage tank and may cause major safety accidents in severe cases.

[0005] Patent CN202657499U discloses a vinyl acetate storage tank that uses a spray device to cool the outside of the tank by spraying water to control the internal temperature of the tank, thereby controlling the polymerization of vinyl acetate. However, this spraying method wastes water resources and affects the surrounding storage environment. Furthermore, after the vinyl acetate is partially discharged from the tank, the air pressure inside the tank decreases, affecting the continued output of vinyl acetate. Utility Model Content

[0006] The technical problem to be solved by the present invention is to provide a vinyl acetate storage system to solve the above-mentioned problems existing in the prior art.

[0007] The utility model provides a technical solution for solving the above-mentioned technical problems as follows: a vinyl acetate storage system, comprising a vinyl acetate storage tank, wherein the outer shell of the vinyl acetate storage tank is provided with a tank jacket, a cooling cavity is provided between the inner wall of the tank jacket and the outer wall of the vinyl acetate storage tank, and the tank jacket is connected to a coolant inlet pipe and a coolant outlet pipe communicating with the cooling cavity; the vinyl acetate storage tank is connected to a nitrogen inlet pipeline, and a nitrogen pressure regulating valve is provided on the nitrogen inlet pipeline; and the vinyl acetate storage tank is connected to a discharge pipeline.

[0008] The beneficial effects of the utility model are as follows: by arranging a cooling chamber outside the vinyl acetate storage tank and circulating a refrigerant, the vinyl acetate in the vinyl acetate storage tank is kept stored at a low temperature, the consumption of the refrigerant is reduced, and the impact on the surrounding storage environment is reduced; by arranging a nitrogen inlet pipeline, a nitrogen sealing effect is played during the storage of the vinyl acetate, effectively solving the risk of the vinyl acetate and air mixing, and at the same time, the pressure can be replenished after the air pressure in the vinyl acetate storage tank decreases, thereby ensuring the discharge air pressure of the vinyl acetate.

[0009] On the basis of the above technical solution, the present invention can also be improved as follows.

[0010] Furthermore, the nitrogen pressure regulating valve includes a first solenoid valve, a first pressure transmitter and a first PLC controller. The first solenoid valve is installed in the nitrogen inlet pipeline. The first pressure transmitter is connected to the vinyl acetate storage tank for detecting the internal air pressure of the vinyl acetate storage tank. The first pressure transmitter is connected to the first solenoid valve through the first PLC controller.

[0011] The beneficial effect of adopting the above further scheme is: the air pressure in the vinyl acetate storage tank is detected in real time by the first pressure transmitter. When the air pressure in the vinyl acetate storage tank drops to a set value, the first PLC controller controls the first solenoid valve to open, inputs nitrogen into the vinyl acetate storage tank, and replenishes the pressure inside the vinyl acetate storage tank; when the pressure is replenished to the set pressure, the first PLC controller controls the first solenoid valve to close and stop replenishing nitrogen.

[0012] Furthermore, the discharge pipeline includes a discharge pump, a delivery pipe and a flow meter. The input end of the discharge pump is connected to the bottom of the vinyl acetate storage tank through a pipeline, and the output end of the discharge pump is connected to the first end of the delivery pipe. The flow meter is arranged on the delivery pipe.

[0013] The beneficial effect of adopting the above further solution is that accurate output of vinyl acetate is ensured through real-time monitoring of the flow meter.

[0014] Furthermore, the feed pipe is provided with a flow regulating valve, and the flow regulating valve is arranged on the feed pipe.

[0015] The beneficial effect of adopting the above further solution is that the setting of the flow control valve can adjust the storage and output flow of vinyl acetate, further improving the output accuracy of vinyl acetate.

[0016] Furthermore, the number of the flow meters is two.

[0017] The beneficial effect of adopting the above further solution is: two flow meters are provided to ensure accurate monitoring of the output flow.

[0018] Furthermore, it also includes a return pipe, one end of which is connected to the first end of the feed pipe, and a pipeline pressure regulating valve is provided on the return pipe.

[0019] The beneficial effect of adopting the above further solution is: when the pressure in the feed pipe increases, in order to prevent the pipeline from being pressurized, the pipeline pressure regulating valve opens and partially flows back to the vinyl acetate storage tank, avoiding damage to the pipeline and the risk of leakage.

[0020] Furthermore, the pipeline pressure regulating valve includes a second solenoid valve, a second pressure transmitter and a second PLC controller. The second solenoid valve is arranged on the return pipe. The second pressure transmitter is connected to the first end of the feed pipe for detecting the pressure in the pipeline. The second pressure transmitter is connected to the second solenoid valve through the second PLC controller.

[0021] The beneficial effect of adopting the above further scheme is: the second pressure transmitter monitors the pressure in the feed pipe in real time. When the pressure in the feed pipe reaches the set value, the second PLC controller controls the second solenoid valve to open, and part of the vinyl acetate in the feed pipe flows back from the reflux pipe to the vinyl acetate storage tank, thereby reducing the pressure in the feed pipe; when the pressure in the feed pipe drops to the set value, the second PLC controller controls the second solenoid valve.

[0022] Furthermore, the vinyl acetate storage tank is connected to a discharge pipe, and the discharge pipe is provided with a switch valve.

[0023] The beneficial effect of adopting the above further solution is that the unloading and emptying arrangement can facilitate unloading and emptying.

[0024] Furthermore, the vinyl acetate storage tank is connected to a remote level gauge for detecting the hydraulic pressure inside the vinyl acetate storage tank.

[0025] The beneficial effect of adopting the above further solution is that the setting of the remote liquid level meter can monitor the liquid level in the vinyl acetate storage tank in real time and transmit the liquid level information to the receiving device.

[0026] Furthermore, the vinyl acetate storage tank is connected to a remote thermometer for detecting the internal temperature of the vinyl acetate storage tank.

[0027] The beneficial effect of adopting the above further solution is that the setting of the remote thermometer can monitor the temperature in the vinyl acetate storage tank in real time and transmit the temperature information to the receiving device. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a structural diagram of the utility model;

[0029] In the accompanying drawings, the components represented by the reference numerals are as follows:

[0030] 1. Vinyl acetate storage tank; 2. Storage tank jacket; 3. Cooling chamber; 4. Coolant inlet pipe; 5. Coolant outlet pipe; 6. Nitrogen inlet pipe; 7. First solenoid valve; 8. First pressure transmitter; 9. Discharge pump; 10. Feed pipe; 11. Flow meter; 12. Flow regulating valve; 13. Return pipe; 14. Second solenoid valve; 15. Second pressure transmitter; 16. Remote thermometer; 17. Discharge and emptying pipe; 18. Switch valve; 19. Remote level gauge. DETAILED DESCRIPTION

[0031] The principles and features of the present invention are described below in conjunction with the accompanying drawings. The examples given are only used to explain the present invention and are not used to limit the scope of the present invention.

[0032] like Figure 1 As shown, an embodiment of the present invention includes a vinyl acetate storage tank 1, which is provided with a tank jacket 2 on the outside of the vinyl acetate storage tank 1, and a cooling cavity 3 is provided between the inner wall of the tank jacket 2 and the outer wall of the vinyl acetate storage tank 1, and the tank jacket 2 is connected to a coolant inlet pipe 4 and a coolant outlet pipe 5 communicating with the cooling cavity 3, and the coolant inlet pipe 4 and the coolant outlet pipe 5 are both provided with corresponding valves to respectively control the opening and closing of the coolant inlet pipe 4 and the coolant outlet pipe 5; the vinyl acetate storage tank 1 is connected to a nitrogen inlet pipeline 6, and the nitrogen inlet pipeline 6 is provided with a nitrogen pressure regulating valve; the vinyl acetate storage tank 1 is connected to a discharge pipeline.

[0033] The vinyl acetate storage tank 1 is connected to a discharge pipe 17, which is provided with an on-off valve 18. The vinyl acetate storage tank 1 can be emptied and discharged by opening the on-off valve 18 according to storage needs. Vinyl acetate to be stored can also be transported to the vinyl acetate storage tank 1 through the discharge pipe 17.

[0034] The vinyl acetate storage tank 1 is connected to a remote level gauge 19 for detecting the internal hydraulic pressure of the vinyl acetate storage tank 1. The vinyl acetate storage tank 1 is also connected to a remote thermometer 16 for detecting the internal temperature of the vinyl acetate storage tank 1. The remote level gauge 19 can monitor the liquid level in the vinyl acetate storage tank 1 in real time and transmit the liquid level information to a receiving device. The remote thermometer 16 can monitor the temperature in the vinyl acetate storage tank 1 in real time and transmit the temperature information to a receiving device.

[0035] In an embodiment of the present utility model, the nitrogen pressure regulating valve includes a first solenoid valve 7, a first pressure transmitter 8 and a first PLC controller (not shown in the accompanying drawings). The first solenoid valve 7 is installed in the nitrogen inlet pipeline 6. The first pressure transmitter 8 is connected to the vinyl acetate storage tank 1 for detecting the internal air pressure of the vinyl acetate storage tank 1. The first pressure transmitter 8 is connected to the first solenoid valve 7 through the first PLC controller. The air pressure in the vinyl acetate storage tank 1 is detected in real time through the first pressure transmitter 8. When the air pressure in the vinyl acetate storage tank 1 drops to a set value, the first PLC controller controls the first solenoid valve 7 to open, input nitrogen into the vinyl acetate storage tank 1, and replenish the pressure inside the vinyl acetate storage tank 1; when the pressure is replenished to the set pressure, the first PLC controller controls the first solenoid valve 7 to close and stop replenishing nitrogen.

[0036] In an embodiment of the present invention, in order to prevent the nitrogen inlet pipeline 6 from opening under the control of the nitrogen pressure regulating valve when the vinyl acetate storage tank 1 is empty or does not store vinyl acetate, the nitrogen inlet pipeline 6 is also provided with a corresponding valve for manual or remote human control of the opening and closing of the nitrogen inlet pipeline 6.

[0037] The discharge pipeline includes a discharge pump 9, a delivery pipe 10, and a flowmeter 11. The input end of the discharge pump 9 is connected to the bottom of the vinyl acetate storage tank 1 via a pipe, and the output end of the discharge pump 9 is connected to the first end of the delivery pipe 10. Two flowmeters 11 are installed on the delivery pipe 10. The delivery pipe 10 is also equipped with a flow regulating valve 12. Real-time monitoring by the flowmeter 11 ensures accurate vinyl acetate output. The flow regulating valve 12 can adjust the output flow rate of the vinyl acetate storage tank, further improving the output accuracy of the vinyl acetate. The two flowmeters 11 monitor the output flow of the vinyl acetate in real time. The two flowmeters 11 are connected to a controller, which is connected to the flow regulating valve 12 to adjust the delivery flow of the delivery pipe 10 according to actual needs.

[0038] In the embodiment of the present invention, corresponding opening valves and pressure gauges can be installed on each pipeline according to actual needs. The number of the discharge pumps 9 can be set to two, and the input ends of the two discharge pumps 9 are respectively connected to the bottom of the vinyl acetate storage tank 1 through pipelines, and the output ends of the two discharge pumps 9 are both connected to the first end of the feed pipe 10. This allows for alternating use to increase service life and facilitates maintenance of a single discharge pump 9, without stopping the delivery of vinyl acetate during maintenance.

[0039] In an embodiment of the present utility model, a return pipe 13 is further included, one end of the return pipe 13 is connected to the first end of the feed pipe 10, and a pipeline pressure regulating valve is provided on the return pipe 13. Specifically, the pipeline pressure regulating valve includes a second solenoid valve 14, a second pressure transmitter 15 and a second PLC controller (not shown in the drawings). The second solenoid valve 14 is provided on the return pipe 13, and the second pressure transmitter 15 is connected to the first end of the feed pipe 10 for detecting the pressure in the pipeline. The second pressure transmitter 15 is connected to the second solenoid valve 14 through the second PLC controller. When the pressure in the feed pipe 10 increases, in order to prevent the pipeline from being pressurized, the pipeline pressure regulating valve opens, and part of the vinyl acetate flows back to the vinyl acetate storage tank 1 to avoid damage to the pipeline and the risk of leakage. The second pressure transmitter 15 monitors the pressure in the feed pipe 10 in real time. When the pressure in the feed pipe 10 reaches the set value, the second PLC controller controls the second solenoid valve 14 to open, and part of the vinyl acetate in the feed pipe 10 flows back to the vinyl acetate storage tank 1 from the reflux pipe 13, thereby reducing the pressure in the feed pipe 10; when the pressure in the feed pipe 10 drops to the set value, the second PLC controller controls the second solenoid valve 14.

[0040] In the embodiment of the present invention, the first PLC controller and the second PLC controller refer to structures that implement two different controls, which can be two independent controllers or one controller to implement the control functions of the first PLC controller and the second PLC controller.

[0041] In an embodiment of the present invention, the coolant may be low-temperature water, such as 5 degrees Celsius low-temperature water.

[0042] The utility model provides a cooling chamber 3 outside the vinyl acetate storage tank 1, and circulates a refrigerant to maintain the low-temperature storage of the vinyl acetate in the vinyl acetate storage tank 1, thereby reducing the consumption of the refrigerant and minimizing the impact on the surrounding storage environment. The utility model provides a nitrogen inlet pipeline 6, which plays a nitrogen sealing role during the storage of the vinyl acetate and effectively solves the risk of mixing of vinyl acetate and air. At the same time, it can replenish the pressure in the vinyl acetate storage tank 1 after the air pressure drops, thereby ensuring the discharge air pressure of the vinyl acetate.

[0043] In the description of the present invention, it should be understood that the terms "center", "length", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "inside", "outside", "peripheral", "circumferential" and the like indicating orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the system or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0044] In the description of the present invention, “a plurality of” means at least two, such as two, three, etc., unless otherwise clearly defined.

[0045] In this utility model, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection; direct connection, or indirect connection through an intermediate medium; internal communication between two components, or interaction between two components, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on specific circumstances.

[0046] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and features of different embodiments or examples without contradiction.

[0047] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A vinyl acetate storage system, characterized in that: The invention comprises a vinyl acetate storage tank (1), wherein the outer shell of the vinyl acetate storage tank (1) is provided with a storage tank jacket (2), a cooling cavity (3) is provided between the inner wall of the storage tank jacket (2) and the outer wall of the vinyl acetate storage tank (1), and the storage tank jacket (2) is connected to a coolant inlet pipe (4) and a coolant outlet pipe (5) which are in communication with the cooling cavity (3); the vinyl acetate storage tank (1) is connected to a nitrogen inlet pipeline (6), and the nitrogen inlet pipeline (6) is provided with a nitrogen pressure regulating valve; and the vinyl acetate storage tank (1) is connected to a discharge pipeline.

2. A vinyl acetate storage system according to claim 1, characterized in that: The nitrogen pressure regulating valve comprises a first solenoid valve (7), a first pressure transmitter (8) and a first PLC controller; the first solenoid valve (7) is installed on the nitrogen inlet pipeline (6); the first pressure transmitter (8) is connected to the vinyl acetate storage tank (1) for detecting the internal air pressure of the vinyl acetate storage tank (1); and the first pressure transmitter (8) is connected to the first solenoid valve (7) via the first PLC controller.

3. The vinyl acetate storage system according to claim 1, characterized in that: The discharge pipeline comprises a discharge pump (9), a delivery pipe (10) and a flow meter (11); the input end of the discharge pump (9) is connected to the bottom of the vinyl acetate storage tank (1) through a pipeline; the output end of the discharge pump (9) is connected to the first end of the delivery pipe (10); and the flow meter (11) is arranged on the delivery pipe (10).

4. A vinyl acetate storage system according to claim 3, characterized in that: The material delivery pipe (10) is also provided with a flow regulating valve (12).

5. A vinyl acetate storage system according to claim 4, characterized in that: The number of the flow meters (11) is two.

6. The vinyl acetate storage system according to claim 4, characterized in that: It also includes a return pipe (13), one end of which is in communication with the first end of the feed pipe (10), and a pipeline pressure regulating valve is provided on the return pipe (13).

7. The vinyl acetate storage system according to claim 6, characterized in that: The pipeline pressure regulating valve comprises a second solenoid valve (14), a second pressure transmitter (15) and a second PLC controller. The second solenoid valve (14) is arranged on the return pipe (13). The second pressure transmitter (15) is connected to the first end of the feed pipe (10) for detecting the pressure in the pipeline. The second pressure transmitter (15) is connected to the second solenoid valve (14) via the second PLC controller.

8. A vinyl acetate storage system according to any one of claims 1 to 7, characterized in that: The vinyl acetate storage tank (1) is connected to a discharge and emptying pipe (17), and a switch valve (18) is provided on the discharge and emptying pipe (17).

9. A vinyl acetate storage system according to any one of claims 1 to 7, characterized in that: The vinyl acetate storage tank (1) is connected to a remote level meter (19) for detecting the internal hydraulic pressure of the vinyl acetate storage tank (1).

10. A vinyl acetate storage system according to any one of claims 1 to 7, characterized in that: The vinyl acetate storage tank (1) is connected to a remote thermometer (16) for detecting the internal temperature of the vinyl acetate storage tank (1).

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