Vehicle-mounted liquefied gas unloading anti-explosion sampling device

Abstract

This utility model belongs to the field of chemical safety production technology, specifically relating to a vehicle-mounted liquefied gas unloading explosion-proof sampling device, comprising: a vehicle-mounted inlet quick connector connected via pipeline to an inlet switch valve, a backup inlet switch valve, and a sampling inlet valve, the sampling inlet valve being connected to the inlet end of the sampling cylinder; this utility model, a vehicle-mounted liquefied gas unloading explosion-proof sampling device, adopts a nitrogen-driven mode, avoiding direct participation of electrical components in the medium transmission process, eliminating potential ignition sources such as electrostatic sparks and electrochemical corrosion, fundamentally meeting the explosion-proof requirements of butadiene operation scenarios. The closed-loop circulation pipeline system prevents gaseous butadiene from contacting air, avoiding the risk of combustion and explosion caused by vapor leakage.

Description

Technical Field

[0001] This utility model belongs to the field of chemical safety production technology, specifically relating to a vehicle-mounted liquefied gas unloading explosion-proof sampling device, which is particularly suitable for explosion-proof sample collection and disposal scenarios during unloading operations. Background Technology

[0002] Butadiene, as an important petrochemical raw material, can form an explosive mixture with air, posing an extremely high risk when exposed to heat sources or open flames. Traditional sampling operations often employ an open process, requiring operators to directly operate the sampling device from the top of the tanker truck. This method has two major drawbacks: (1) the risk of exposure to gaseous substances during operation is high, and explosions can easily occur due to static electricity buildup or operational negligence; (2) the disorderly discharge of residual samples leads to environmental pollution. Existing explosion-proof technologies generally have the following drawbacks: the failure to establish a complete closed-loop system makes it difficult to completely remove pipeline residues after sampling; insufficient explosion-proof rating of drive equipment; lack of nitrogen purging and safe recovery systems for waste liquids and gases; and pressure fluctuations during the sampling process can easily cause media volatilization and leakage.

[0003] While some improved devices exist in the industry, they generally employ electric or mechanical drive modes, posing safety hazards in explosive environments. Furthermore, the lack of an integrated media replacement system necessitates manual disassembly and cleaning after each sampling, impacting operational continuity. Additionally, current technologies exhibit low levels of systematization in the treatment of waste gas and liquid during the sampling process, failing to achieve comprehensive environmental isolation and control throughout the entire process. To address these technical challenges, there is an urgent need to develop an explosion-proof sampling system with fully enclosed conduction, inert gas drive, and integrated self-cleaning capabilities. Utility Model Content

[0004] This utility model provides a vehicle-mounted liquefied gas unloading explosion-proof sampling device, the purpose of which is to meet the explosion-proof requirements of liquefied gas operation scenarios.

[0005] To achieve the above objectives, the technical solution of this utility model is as follows:

[0006] A vehicle-mounted liquefied gas unloading explosion-proof sampling device includes: a vehicle-mounted inlet quick connector that connects to an inlet switch valve, a backup inlet switch valve and a sampling inlet valve via a pipeline, wherein the sampling inlet valve is connected to the inlet end of the sampling cylinder;

[0007] The vehicle-mounted quick-connect outlet is connected to the outlet switch valve and the sampling outlet valve via a pipeline. The sampling outlet valve is connected to the outlet end of the sampling cylinder.

[0008] The medium inlet end of the pneumatic diaphragm pump is equipped with a diaphragm pump inlet switch valve, which is connected between the inlet switch valve and the standby inlet switch valve. The medium outlet end is connected to the front end of the sampling inlet valve, and the gas inlet end is connected to the nitrogen source switch.

[0009] A circulating switching valve is connected between the inlet switching valve and the outlet switching valve via a pipeline.

[0010] Furthermore, a waste gas adsorption box is connected between the sampling outlet valve and the outlet switch valve, and a waste gas adsorption switch valve is provided at the inlet end of the waste gas adsorption box; a waste liquid storage tank is also connected between the sampling outlet valve and the outlet switch valve, and a waste liquid storage switch valve is provided at the inlet end of the waste liquid storage tank.

[0011] Furthermore, the nitrogen source switch includes a main switch, a first switch, a second switch, and a third switch;

[0012] The main switch, the first switch, the second switch, and the third switch are connected in a cross shape; the first switch controls nitrogen to enter the pneumatic diaphragm pump, providing power to the pneumatic diaphragm pump; the second switch controls nitrogen to enter the sampling pipeline, cleaning the sampling pipeline; the third switch controls nitrogen to enter the pipeline leading to the waste liquid storage tank, cleaning the pipeline of the waste liquid storage tank.

[0013] Furthermore, the nitrogen source includes a nitrogen generator and a nitrogen storage tank, and the nitrogen generator, nitrogen storage tank, and sampling system are mounted on a mobile vehicle.

[0014] Furthermore, the waste liquid storage tank is equipped with a waste liquid inlet, a waste liquid outlet, and a breather valve.

[0015] The beneficial effects achieved by this utility model are as follows:

[0016] This utility model discloses an explosion-proof sampling device for unloading liquefied petroleum gas (LPG) on a vehicle. It employs a nitrogen-driven mode (the pneumatic diaphragm pump is driven by a nitrogen source), avoiding direct involvement of electrical components in the medium transmission process and eliminating potential ignition sources such as electrostatic sparks and electrochemical corrosion. This fundamentally meets the explosion-proof requirements for butadiene (a Class IIC explosive hazardous medium) handling scenarios. The closed-loop circulation pipeline system prevents gaseous butadiene from contacting air, avoiding the risk of combustion and explosion caused by vapor leakage.

[0017] This utility model discloses an explosion-proof sampling device for unloading liquefied gas on a vehicle. The waste gas adsorption box uses activated carbon / molecular sieve to adsorb residual volatile substances, ensuring that the emissions meet environmental protection standards. The waste liquid storage tank is equipped with a breather valve to ensure stable pressure, and combined with nitrogen purging, it achieves pressurized and sealed discharge to avoid secondary pollution.

[0018] This utility model discloses a vehicle-mounted liquefied gas unloading explosion-proof sampling device, which integrates a nitrogen generator, storage tank and sampling system into an explosion-proof electric vehicle, supports rapid deployment in mobile working conditions, and is especially suitable for scenarios where multiple tank trucks alternate operations in a factory area; the quick-connect hose connection system can quickly complete the docking and decoupling of the tank truck and the equipment, reducing the exposure time in the open environment. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0020] Figure 1 A schematic diagram of the overall structure of a vehicle-mounted liquefied gas unloading explosion-proof sampling device;

[0021] Figure 2 A schematic diagram of a nitrogen source for a vehicle-mounted liquefied gas unloading explosion-proof sampling device on a mobile vehicle;

[0022] Figure 3 A schematic diagram of a waste liquid storage tank for a vehicle-mounted liquefied gas unloading explosion-proof sampling device;

[0023] In the diagram, 1. Vehicle-mounted inlet quick connector; 2. Vehicle-mounted outlet quick connector; 3. Inlet switch valve; 4. Outlet switch valve; 5. Pneumatic diaphragm pump; 6. Backup inlet switch valve; 7. Sampling inlet valve; 8. Sampling outlet valve; 9. Circulation switch valve; 10. Diaphragm pump inlet switch valve; 11. Waste gas adsorption switch valve; 12. Waste liquid storage switch valve; 13. Waste gas adsorption box; 14. Waste liquid storage tank; 15. Second switch; 16. First switch; 17. Third switch; 18. Main switch; 19. Nitrogen generator; 20. Nitrogen storage tank; 21. Sampling system; 22. Waste liquid inlet; 23. Breathing valve; 24. Waste liquid outlet.

[0024] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0025] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0026] It should be noted that if the embodiments of this utility model involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicators will also change accordingly.

[0027] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, features defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, if the word "and / or" appears throughout the text, it means including three parallel solutions; for example, "A and / or B" includes solution A, solution B, or a solution that simultaneously satisfies A and B. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0028] like Figures 1-3 As shown, this utility model provides a vehicle-mounted liquefied gas unloading explosion-proof sampling device 21, including: a vehicle-mounted inlet quick connector 1 connected to an inlet switch valve 3, a spare inlet switch valve 6 and a sampling inlet valve 7 via a pipeline, and the sampling inlet valve 7 connected to the inlet end of the sampling cylinder.

[0029] The vehicle-mounted quick-connector 2 connects the outlet switch valve 4 and the sampling outlet valve 8 via a pipe. The sampling outlet valve 8 is connected to the outlet end of the sampling cylinder.

[0030] The inlet switch valve 3 controls the path of the medium from the tank truck into the system. The outlet switch valve 4 regulates the path of the sample returning to the tank truck or flowing to the waste gas / waste liquid treatment unit.

[0031] The backup inlet switch valve 6 serves as an emergency channel in case of failure of the pneumatic diaphragm pump 5, ensuring continuous operation of the system.

[0032] The sampling inlet valve 7 and sampling outlet valve 8 control the flow of the medium from the inlet end of the sampling cylinder to the outlet end to discharge residues, thus achieving seamless connection between the sampling cylinder and the system.

[0033] Vehicle-mounted inlet quick connector 1 and vehicle-mounted outlet quick connector 2 allow for quick connection / disconnection with the tank truck's inlet and outlet, ensuring pipeline airtightness and reducing exposure time in open environments.

[0034] The medium inlet end of the pneumatic diaphragm pump 5 is equipped with a diaphragm pump inlet switch valve 10, which is connected between the inlet switch valve 3 and the standby inlet switch valve 6. The medium outlet end is connected to the front end of the sampling inlet valve 7, and the gas inlet end is connected to the nitrogen source switch. A circulation switch valve 9 is connected between the inlet switch valve 3 and the outlet switch valve 4 through a pipeline.

[0035] A nitrogen-driven pneumatic diaphragm pump 5 pressurizes and delivers butadiene samples to a steel cylinder via synchronous movement of two pistons, requiring no electrical input.

[0036] The circulating switch valve 9 connects the inlet and outlet circuits, and uses the tanker's own pressure to circulate and replace air or residue in the pipeline.

[0037] A waste gas adsorption box 13 is connected between the sampling outlet valve 8 and the outlet switch valve 4. A waste gas adsorption switch valve 11 is installed at the inlet end of the waste gas adsorption box 13. A waste liquid storage tank 14 is also connected between the sampling outlet valve 8 and the outlet switch valve 4. A waste liquid storage switch valve 12 is installed at the inlet end of the waste liquid storage tank 14. The waste gas is purified by adsorbing residual volatile organic compounds (VOCs) through activated carbon or molecular sieves in the pipeline before being discharged.

[0038] The waste liquid storage tank 14 is equipped with a waste liquid inlet 22, a waste liquid outlet 24, and a breather valve 23. The waste liquid storage tank 14 temporarily stores the sampled waste liquid, and the inflow is controlled by the waste liquid storage switch valve 12. The breather valve 23 is also equipped to maintain the pressure balance inside the tank.

[0039] The nitrogen source switch includes a main switch 18, a first switch, a second switch 15, and a third switch 17; the main switch 18, the first switch, the second switch 15, and the third switch 17 are connected in a cross shape; the first switch controls nitrogen to enter the pneumatic diaphragm pump 5, providing power to the pneumatic diaphragm pump 5; the second switch 15 controls nitrogen to enter the sampling pipeline, cleaning the sampling pipeline; the third switch 17 controls nitrogen to enter the pipeline leading to the waste liquid storage tank 14, cleaning the pipeline of the waste liquid storage tank 14.

[0040] The nitrogen source includes a nitrogen generator 19 and a nitrogen storage tank 20, which are mounted on a mobile vehicle. The nitrogen generator 19, nitrogen storage tank 20, and sampling system 21 are integrated into the vehicle, making it compatible with explosion-proof electric vehicles and meeting the needs of mobile operations within the chemical plant.

[0041] The system is carried by an explosion-proof electric vehicle commonly used in chemical plants. The battery powers the nitrogen generator. After the generator starts operating, the produced nitrogen is stored in a nitrogen storage tank. The generated nitrogen pressure is 0.8 MPa, and the output is 100 L. Once the pressure is reached, the generator automatically stops. When the pressure is less than 0.45 MPa, the generator automatically starts operating again. After the gas storage is complete, it awaits the sampling system to operate.

[0042] Tanker truck sampling is performed by connecting the onboard inlet quick connector and the onboard outlet quick connector via a quick-connect hose. After the connection is made, the butadiene sampling cylinder is installed.

[0043] Open the inlet valve 3 and the outlet valve 4. Initially, the tanker pressure is relatively high. You can use the circulation valve to circulate and replace the pressure.

[0044] After circulation, close the circulation switch valve 9, open the diaphragm pump inlet switch valve 10, and then open the pneumatic diaphragm pump 5 air source drive switch (main switch 18 and third switch 17). The sample is pressurized by the pneumatic diaphragm pump 5 into the sampling cylinder for sampling. After sampling, first close the inlet switch valve 3, then close the diaphragm pump inlet switch valve 10, then close the pneumatic diaphragm pump 5 air source drive switch (third switch 17), and close the outlet switch valve 4. Remove the sampling outlet connecting quick connector hose, remove the sampling cylinder, and connect the sampling inlet valve 7 and the sampling outlet valve 8 using the provided flexible hose.

[0045] After sampling is completed, turn on the second switch 15 and the third switch 17 to purge the sample flow path. Turn on the waste liquid storage switch valve 12 to store the waste liquid in the flow path into the waste liquid storage tank 14. After the liquid is drained, turn off the waste liquid discharge valve, turn on the waste gas adsorption switch valve 11, purge the entire flow path with nitrogen to avoid affecting the next sampling, and then turn off the waste gas adsorption switch valve 11.

[0046] The above description is only an optional embodiment of the present utility model and does not limit the patent scope of the present utility model. All equivalent structural transformations made under the inventive concept of the present utility model using the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present utility model.

Claims

1. A vehicle-mounted liquefied gas unloading explosion-proof sampling device, characterized in that, include: The vehicle-mounted inlet quick connector (1) is connected to the inlet switch valve (3), the spare inlet switch valve (6) and the sampling inlet valve (7) through a pipeline. The sampling inlet valve (7) is connected to the inlet end of the sampling cylinder. The vehicle-mounted quick connector (2) connects the outlet switch valve (4) and the sampling outlet valve (8) through a pipeline. The sampling outlet valve (8) is connected to the outlet end of the sampling cylinder. The medium inlet end of the pneumatic diaphragm pump (5) is equipped with a diaphragm pump inlet switch valve (10), which is connected between the inlet switch valve (3) and the standby inlet switch valve (6). The medium outlet end is connected to the front end of the sampling inlet valve (7), and the gas inlet end is connected to the nitrogen source switch. A circulation valve (9) is connected between the inlet switch valve (3) and the outlet switch valve (4) via a pipeline.

2. The vehicle-mounted liquefied gas unloading explosion-proof sampling device according to claim 1, characterized in that: A waste gas adsorption box (13) is connected between the sampling outlet valve (8) and the outlet switch valve (4), and a waste gas adsorption switch valve (11) is provided at the inlet end of the waste gas adsorption box (13); a waste liquid storage tank (14) is also connected between the sampling outlet valve (8) and the outlet switch valve (4), and a waste liquid storage switch valve (12) is provided at the inlet end of the waste liquid storage tank (14).

3. The vehicle-mounted liquefied gas unloading explosion-proof sampling device according to claim 1, characterized in that: The nitrogen source switch includes a main switch (18), a first switch, a second switch (15), and a third switch (17); The main switch (18), the first switch, the second switch (15), and the third switch (17) are connected in a cross shape; the first switch controls nitrogen to enter the pneumatic diaphragm pump (5) to provide power to the pneumatic diaphragm pump (5); the second switch (15) controls nitrogen to enter the sampling pipeline to clean the sampling pipeline; the third switch (17) controls nitrogen to enter the pipeline leading to the waste liquid storage tank (14) to clean the pipeline of the waste liquid storage tank (14).

4. The vehicle-mounted liquefied gas unloading explosion-proof sampling device according to claim 3, characterized in that: The waste liquid storage tank (14) is equipped with a waste liquid inlet (22), a waste liquid outlet (24), and a breather valve (23).

5. The vehicle-mounted liquefied gas unloading explosion-proof sampling device according to claim 1, characterized in that: The nitrogen source includes a nitrogen generator (19) and a nitrogen storage tank (20), and the nitrogen generator (19), nitrogen storage tank (20) and sampling system (21) are installed on a mobile vehicle.

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