Safe truck loading system for high-boiling residues in vinyl chloride

Abstract

The utility model discloses a safe truck loading system for high-boiling residues in vinyl chloride, which comprises an EDC storage tank, a delivery pump, a truck loading arm and a delivery pump control cabinet, the EDC storage tank, the delivery pump and the truck loading arm are connected through pipelines, the EDC storage tank is connected with a storage tank feed pipe and a vinyl chloride recovery gas pipe, and the delivery pump control cabinet is connected with the EDC storage tank feed pipe. A pressure sensor and a liquid level sensor are arranged on the EDC storage tank, and the conveying pump and the loading crane pipe are connected with the EDC storage tank through an air return pipe and a liquid return pipe. The device is simple in structure and integrally linked, and pumping loading and vinyl chloride gas recovery are carried out through the EDC storage tank; a liquid return pipe and an air return pipe are arranged between the delivery pump and the loading crane pipe, and valves on the pipelines are linked, so that the influence caused by no load of the delivery pump, over-high pipeline pressure or over-low and over-high liquid level can be prevented.

Description

Technical Field

[0001] The utility model relates to the technical field of high-boiling-substance loading, in particular to a safe loading system for high-boiling-substances in vinyl chloride. Background Art

[0002] The production of vinyl chloride by the acetylene process will produce high-boiling substances in vinyl chloride as by-products. High-boiling substances in vinyl chloride are colorless and transparent liquids. They have a pleasant smell, taste sweet, are volatile and flammable, and have an explosion limit of 16%-6.2%. Their vapor can form an explosive mixture with air, which can cause combustion and explosion when exposed to open flames and high heat. They decompose under high heat to produce toxic and corrosive fumes, which react with oxidants. They are prone to combustion and release toxic gases when exposed to open flames and high heat. Their vapor is heavier than air and can diffuse to relatively far places at a lower level. They will catch fire and burn back when exposed to a fire source. There are extremely high safety risks in the storage, transportation, and loading of high-boiling substances in vinyl chloride, so it is very important to adopt a reliable loading system.

[0003] At present, there is also a safe loading system for by-products in PVC production with a publication number of (CN 216236014 U), which specifically discloses a high-boiling material storage tank, a loading pipe, a condenser, a liquid seal tank and a gas discharge cylinder. One end of the loading pipe is connected to the tank truck, and the other end is connected to the nitrogen purge pipe and the high-boiling material storage tank through a valve; the top two sides of the high-boiling material storage tank are connected to the high-boiling material feed pipe and the nitrogen purge pipe through valves, respectively, and the top of the tank truck is also connected to a gas outlet main pipe through a valve, and the gas outlet main pipe is connected to a first branch pipe and a second branch pipe through a valve, respectively, the first branch pipe is directly connected to the gas discharge cylinder, and the second branch pipe is connected to the gas discharge cylinder through a condenser and a liquid seal tank in sequence. Although the system can achieve high-boiling material loading, the linkage of the entire system is not enough, and the loading and exhaust are separated into two lines, and the overall linkage is poor. Utility Model Content

[0004] The utility model aims to solve the shortcomings in the prior art and proposes a safe loading system for high-boiling substances in vinyl chloride.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] A safe loading system for medium- and high-boiling materials in vinyl chloride comprises an EDC storage tank, a delivery pump, a loading crane pipe and a delivery pump control cabinet. The EDC storage tank, the delivery pump and the loading crane pipe are connected by pipelines. The EDC storage tank is connected to a storage tank feed pipe and a vinyl chloride recovery gas pipe. A pressure sensor and a liquid level sensor are arranged on the EDC storage tank. The delivery pump and the loading crane pipe are connected to the EDC storage tank via a return gas pipe and a return liquid pipe.

[0007] Furthermore, a shut-off valve B is provided on the pipeline between the EDC storage tank and the delivery pump, a shut-off valve C is provided on the pipeline between the delivery pump and the loading crane pipe, an ultrasonic level meter is installed on the loading crane pipe, and the shut-off valve C is interlocked with the ultrasonic level meter; the loading crane pipe is provided with a crane pipe emptying valve and a crane pipe exhaust valve;

[0008] The high-boiling substances in the vinyl chloride in the EDC storage tank enter the delivery pump through the cut-off valve B, and are sent to the loading crane pipe after being pressurized by the delivery pump; the cut-off valve C is interlocked with the ultrasonic level meter to realize the emergency cut-off function of the tank truck liquid level monitoring; the crane pipe drain valve set on the loading crane pipe is used to discharge the gas in the tank truck that does not meet the recovery requirements;

[0009] Furthermore, the EDC storage tank adopts a hot water jacket device, and the hot water jacket device is respectively provided with a hot water inlet valve and a hot water outlet valve; the recovered vinyl chloride gas pipe is provided with a cut-off valve A;

[0010] The jacket is heated with hot water, and the flow of hot water in the jacket is adjusted by the hot water inlet valve and the hot water outlet valve; the EDC storage tank is heated and recovered by the hot water jacket equipment; the recovered vinyl chloride gas is recovered by the cut-off valve A.

[0011] Further, a shut-off valve D is provided on the liquid return pipe between the shut-off valve C and the EDC storage tank, and the shut-off valve C and the shut-off valve D are interlocked;

[0012] When the cut-off valve C is closed due to the interlock triggered by the condition, the cut-off valve D opens, thereby preventing the delivery pump outlet pipeline from overpressure.

[0013] Furthermore, an exhaust valve is provided on the outlet pipe of the delivery pump, and the exhaust valve is connected to the EDC storage tank through a return air pipe; the exhaust valve of the crane pipe is connected to the EDC storage tank through a return air pipe;

[0014] The function of the exhaust valve is to exhaust the delivery pump before starting the delivery pump; the exhaust valve is used to recover the vinyl chloride gas discharged from the tank truck during the loading operation of high-boiling substances in vinyl chloride.

[0015] Furthermore, the EDC storage tank is provided with a safety valve and a bursting disc;

[0016] The safety valve and bursting disc are set to prevent the EDC storage tank from overpressure when heating and recovering vinyl chloride gas.

[0017] Furthermore, the cut-off valve A is interlocked with a pressure sensor to achieve emergency cut-off when the recovered vinyl chloride is over-pressured.

[0018] Furthermore, the shut-off valve B is interlocked with the liquid level sensor, and the shut-off valve B is interlocked with the delivery pump control cabinet to achieve interlocking and stopping the delivery pump when the EDC storage tank is urgently shut off due to low liquid level.

[0019] The beneficial effects of the utility model are as follows: simple structure and overall linkage, pumping and loading and vinyl chloride gas recovery are carried out through the EDC storage tank; a liquid return pipe and an air return pipe are also arranged between the delivery pump and the loading crane pipe, and the valves on the pipeline are linked to prevent the effects caused by the delivery pump being idling, the pipeline pressure being too high, or the liquid level being too low or too high. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a system structure diagram of the utility model;

[0021] In the figure: 1. Shut-off valve A; 2. Safety valve; 3. Bursting disc; 4. EDC storage tank; 5. Hot water inlet valve; 6. Hot water outlet valve; 7. Pressure sensor; 8. Liquid level sensor; 9. Shut-off valve B; 10. Delivery pump; 11. Exhaust valve; 12. Shut-off valve C; 13. Crane pipe exhaust valve; 14. Loading crane pipe; 15. Ultrasonic liquid level meter; 16. Shut-off valve D; 17. Delivery pump control cabinet; 18. Crane pipe emptying valve; 19. Storage tank feed pipe; 20. Vinyl chloride gas pipe; 21. Return air pipe; 22. Return liquid pipe. DETAILED DESCRIPTION

[0022] like Figure 1 As shown, the utility model provides a safe loading system for medium- and high-boiling materials in vinyl chloride, which has the following structure: an EDC storage tank 4, a delivery pump 10, a loading crane pipe 14 and a delivery pump control cabinet 17; the EDC storage tank 4, the delivery pump 10 and the loading crane pipe 14 are connected by pipelines; the EDC storage tank 4 is connected with a storage tank feed pipe 19 and a vinyl chloride recovery gas pipe 20; the EDC storage tank 4 is provided with a pressure sensor 7 and a liquid level sensor 8; the delivery pump 10 and the loading crane pipe 14 are connected to the EDC storage tank 4 through a return gas pipe 21 and a return liquid pipe 22; a shut-off valve B9 is provided on the pipeline between the EDC storage tank 4 and the delivery pump 10; a shut-off valve C12 is provided on the pipeline between the delivery pump 10 and the loading crane pipe 14; an ultrasonic level meter 15 is installed on the loading crane pipe 14; and the shut-off valve C12 is connected to the ultrasonic level meter 15. Interlocking; a crane pipe emptying valve 18 and a crane pipe exhaust valve 13 are provided on the loading crane pipe 14; the EDC storage tank 4 adopts a hot water jacket device, and the hot water jacket device is respectively provided with a hot water inlet valve 5 and a hot water outlet valve 6; a shut-off valve A1 is provided on the vinyl chloride recovery gas pipe 20; a shut-off valve D16 is provided on the return liquid pipe 22 between the shut-off valve C12 and the EDC storage tank 4, and the shut-off valve C12 and the shut-off valve D16 are interlocked; an exhaust valve 11 is provided on the outlet pipe of the delivery pump 10, and the exhaust valve 11 is connected to the EDC storage tank 4 through the return air pipe 21; the crane pipe exhaust valve 13 is connected to the EDC storage tank 4 through the return air pipe 21; a safety valve 2 and a bursting disc 3 are provided on the EDC storage tank 4; the shut-off valve A1 is interlocked with the pressure sensor 7; the shut-off valve B9 is interlocked with the liquid level sensor 8, and the shut-off valve B9 is interlocked with the delivery pump control cabinet 17;

[0023] Specifically, the valves in the entire loading system and the delivery pump control cabinet 17 are controlled by the DCS control system, wherein the ultrasonic level meter 15, the pressure sensor 7 and the level sensor 8 are all connected to the DCS control system, and the data is transmitted to the DCS control system to control the corresponding valves. The high-boiling substances in the vinyl chloride in the EDC storage tank 4 enter the delivery pump 10 through the cut-off valve B9, and are sent to the loading crane pipe 14 after being pressurized by the delivery pump 10; the cut-off valve C12 is interlocked with the ultrasonic level meter 15 to realize the emergency cut-off function of the tank truck liquid level monitoring; the crane pipe emptying valve 18 provided on the loading crane pipe 14 is used to discharge the gas in the tank truck that does not meet the recovery requirements; the hot water jacket equipment used in the EDC storage tank 4 adjusts the jacket hot water flow rate through the hot water inlet valve 5 and the hot water outlet valve 6; the EDC storage tank 4 uses the hot water jacket equipment to heat and recover the vinyl chloride in the EDC storage tank 4; the recovered vinyl chloride gas is recovered through the cut-off valve A1; when the cut-off valve C12 is triggered by the condition, the linkage After the lock is closed, the shut-off valve D16 is opened to prevent the outlet pipeline of the delivery pump 10 from being over-pressurized; the exhaust valve 11 exhausts the delivery pump 10 before starting the delivery pump 10; the exhaust valve 11 is used to recover the vinyl chloride gas discharged from the tank truck during the loading operation of the high-boiling substances in vinyl chloride; the safety valve 2 and the bursting disc 3 are arranged to prevent the EDC storage tank 4 from being over-pressurized when the vinyl chloride gas is heated and recovered; the shut-off valve A1 is interlocked with the pressure sensor 7 to achieve emergency shut-off when the recovered vinyl chloride is over-pressurized; the shut-off valve B9 is interlocked with the liquid level sensor 8, and the shut-off valve B9 is interlocked with the delivery pump control cabinet 17; the delivery pump 10 is interlocked to stop when the EDC storage tank 4 is under low liquid level emergency shut-off.

Claims

1. A safe loading system for high boiling substances in vinyl chloride, characterized by: It includes an EDC storage tank, a delivery pump, a loading crane pipe and a delivery pump control cabinet. The EDC storage tank, the delivery pump and the loading crane pipe are connected by pipelines. The EDC storage tank is connected to a storage tank feed pipe and a vinyl chloride recovery gas pipe. A pressure sensor and a liquid level sensor are provided on the EDC storage tank. The delivery pump and the loading crane pipe are connected to the EDC storage tank through a return air pipe and a return liquid pipe.

2. A safe loading system for high boiling substances in vinyl chloride according to claim 1, characterized in that: A shut-off valve B is provided on the pipeline between the EDC storage tank and the delivery pump, a shut-off valve C is provided on the pipeline between the delivery pump and the loading crane pipe, an ultrasonic level meter is installed on the loading crane pipe, and the shut-off valve C is interlocked with the ultrasonic level meter; a crane pipe emptying valve and a crane pipe exhaust valve are provided on the loading crane pipe.

3. A safe loading system for medium- and high-boiling substances in vinyl chloride according to claim 2, characterized in that: The EDC storage tank adopts a hot water jacket device, and the hot water jacket device is respectively provided with a hot water inlet valve and a hot water outlet valve; a cut-off valve A is provided on the vinyl chloride recovery gas pipe.

4. A safe loading system for medium- and high-boiling substances in vinyl chloride according to claim 2, characterized in that: A cut-off valve D is provided on the liquid return pipe between the cut-off valve C and the EDC storage tank, and the cut-off valve C and the cut-off valve D are interlocked.

5. A safe loading system for medium- and high-boiling substances in vinyl chloride according to claim 2, characterized in that: An exhaust valve is arranged on the outlet pipe of the delivery pump, and the exhaust valve is connected to the EDC storage tank through a return air pipe; the crane pipe exhaust valve is connected to the EDC storage tank through a return air pipe.

6. A safe loading system for medium- and high-boiling substances in vinyl chloride according to claim 1, characterized in that: The EDC storage tank is provided with a safety valve and a bursting disc.

7. A safe loading system for medium- and high-boiling substances in vinyl chloride according to claim 3, characterized in that: The cut-off valve A is interlocked with the pressure sensor; the cut-off valve B is interlocked with the liquid level sensor, and the cut-off valve B is interlocked with the delivery pump control cabinet.

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