CN217103066U

CN217103066U - Novel oil tank truck unloading system

Info

Publication number: CN217103066U
Application number: CN202220419633.6U
Authority: CN
Inventors: 李佳琳
Original assignee: LUOYANG RUIZE PETROCHEMICAL ENGINEERING CO LTD
Current assignee: LUOYANG RUIZE PETROCHEMICAL ENGINEERING CO LTD
Priority date: 2022-02-28
Filing date: 2022-02-28
Publication date: 2022-08-02
Anticipated expiration: 2032-02-28

Abstract

The utility model relates to a novel tank wagon system of unloading, including tank wagon, the gas phase pipeline of unloading and the liquid phase pipeline of unloading, the tank wagon is equipped with top gas phase mouth and bottom liquid phase mouth, and the entry end of the gas phase pipeline of unloading is linked together with the nitrogen gas source, and the exit end of the gas phase pipeline of unloading is linked together with top gas phase mouth, pressure-reducing valve, restriction valve, gaseous phase check valve and gaseous phase oil filling riser have set gradually on the gas phase pipeline of unloading from entry end to exit end direction; the inlet end of the unloading liquid phase pipeline is communicated with the bottom liquid phase port, the outlet end of the unloading liquid phase pipeline is communicated with the oil unloading storage tank, and a liquid phase crane pipe, a filter, an unloading pump and a liquid phase check valve are sequentially arranged on the unloading liquid phase pipeline from the inlet end to the outlet end; the unloading pump and the pressure reducing valve are controlled in an interlocking manner. The utility model discloses can avoid the formation of explosive gas mixture in the tank wagon oil discharge system operation processes such as oil refinery unloading district, filling station, provide the guarantee for the safe and reliable line of the operation of unloading.

Description

Novel oil tank truck unloading system

Technical Field

The utility model belongs to petrochemical oil warehousing and transportation system field, concretely relates to tank wagon system of unloading such as oil refinery unloading district, filling station.

Background

The tank truck is also called a mobile refueling truck and is mainly used for transporting and storing petroleum derivatives (petroleum products such as gasoline, diesel oil, crude oil, lubricating oil and coal tar). The design specification GB50759-2012 of the oil recovery facility of the existing oil loading system requires that a loading system of gasoline, naphtha, aviation kerosene, solvent oil or similar oil products is provided with a closed oil recovery system, and the oil refining industry pollutant emission standard GB31570-2015, the petrochemical industry pollutant emission standard GB31571-2015 and the like have clear requirements on the emission limit values of various hazardous chemical substances, so that the oil tank truck operation is mostly matched with the oil recovery system. The gas phase space oil gas is prevented from directly discharging into the atmosphere in the loading process of the oil tank truck, and explosive gas mixture is prevented from being formed outside the oil tank truck. However, in the unloading process of the oil tank truck, the top opening of the oil tank truck is often opened, combustible liquid vapor can diffuse to the periphery outside the tank opening, and when oil is unloaded from the oil tank truck, the gas phase space above the liquid is enlarged, the pressure in the tank is reduced, so that air is sucked and forms an explosive mixture with the vapor in the tank. In addition, the oil filled in the tank truck is changed constantly, for example, kerosene or diesel oil is changed from a tank filled with gasoline for vehicles, when high-flash-point oil is filled into the tank filled with residual low-flash-point oil vapor, the oil vapor can be absorbed by liquid, the pressure in the tank is reduced, a large amount of air is sucked along with the pressure, and a vapor-air explosive gas mixture can be formed between the liquid level and an air inlet. Ignition sources in the oil loading and unloading process mainly comprise electrostatic sparks, electric sparks, lightning sparks, open flame sources, friction impact sparks and the like. These ignition sources may cause oil combustion or explosion of mixed gas of steam and air, which may further cause casualties, economic losses, etc.

SUMMERY OF THE UTILITY MODEL

For solving the prior art problem, the utility model provides a novel tank wagon system of unloading has avoided the formation of explosive gas mixture in tank wagon system of unloading operation in-process such as oil refinery unloading district, filling station.

The purpose of the utility model and the technical problem thereof are realized by adopting the following technical scheme. According to the utility model provides a novel tank wagon system of unloading, including tank wagon, the gas phase pipeline of unloading and the liquid phase pipeline of unloading, the tank wagon is equipped with top gas phase mouth and bottom liquid phase mouth, and the entry end of the gas phase pipeline of unloading is linked together with the nitrogen gas source, and the exit end of the gas phase pipeline of unloading is linked together with top gas phase mouth, relief pressure valve, restriction valve, gaseous phase check valve and gaseous phase crane pipe have set gradually on the gas phase pipeline of unloading from entry end to exit end direction; the inlet end of the unloading liquid phase pipeline is communicated with the bottom liquid phase port, the outlet end of the unloading liquid phase pipeline is communicated with the oil unloading storage tank, and a liquid phase crane pipe, a filter, an unloading pump and a liquid phase check valve are sequentially arranged on the unloading liquid phase pipeline from the inlet end to the outlet end; the unloading pump and the pressure reducing valve are controlled in an interlocking manner.

Further, the nitrogen source is a low-pressure nitrogen pipe network or a nitrogen buffer tank.

Furthermore, a pump outlet valve is arranged on a unloading liquid phase pipeline between the liquid phase check valve and the oil unloading storage tank, and a pump inlet valve is arranged on an unloading liquid phase pipeline between the filter and the liquid phase loading arm.

Furthermore, a purging port is connected to the unloading liquid phase pipeline between the pump outlet valve and the liquid phase check valve.

Furthermore, the oil tank truck is provided with a pressure detection meter for monitoring the internal pressure of the oil tank.

And further, the unloading pump and the flow limiting valve are controlled in an interlocking mode, and when the pressure detection meter detects that the internal pressure of the oil tank truck is higher than a limit value, the unloading pump and the flow limiting valve are immediately closed in an interlocking mode.

The utility model has the advantages that: the utility model discloses a set up the gas phase pipeline of unloading, set up relief pressure valve, restriction valve, check valve on the gas phase pipeline of unloading to at the tank wagon oil discharge in-process supplementary oil discharge in-process tank wagon liquid level decline gas phase space increase's tolerance, prevent that the air from getting into the tank wagon and forming the explosive combustible body, provide the guarantee for the safe and reliable of the operation of unloading.

Drawings

Fig. 1 is a schematic structural diagram of the present invention.

Description of reference numerals:

1. the device comprises a gas phase crane pipe, 2. a gas phase check valve, 3. a flow limiting valve, 4. a pressure reducing valve, 5. a liquid phase crane pipe, 6. a filter, 7. an unloading pump, 8. a purging port, 9. a top gas phase port, 10. a bottom liquid phase port, 11. a pressure detection meter, 12. an oil tank truck, 13. an unloading gas phase pipeline, 14. an unloading liquid phase pipeline, 15. a nitrogen source, 16. an unloading storage tank, 17. a liquid phase check valve, 18. a pump outlet valve and 19. a pump inlet valve.

Detailed Description

The following detailed description is to be read in connection with the drawings and the preferred embodiments.

The embodiment of the novel oil tank truck unloading system is shown in figure 1 and comprises an oil tank truck 12, an unloading gas phase pipeline 13 and an unloading liquid phase pipeline 14, wherein the oil tank truck 12 is provided with a top gas phase port 9 and a bottom liquid phase port 10, the inlet end of the unloading gas phase pipeline 13 is connected with a nitrogen source 15, the nitrogen source is a low-pressure nitrogen pipe network or a nitrogen buffer tank, the outlet end of the unloading gas phase pipeline 13 is connected with the top gas phase port 9 of the oil tank truck, and the nitrogen source 15 provides nitrogen for the oil tank truck 12 through the unloading gas phase pipeline 13. The unloading gas phase pipeline 13 is sequentially provided with a pressure reducing valve 4, a flow limiting valve 3, a gas phase check valve 2 and a gas phase crane pipe 1 from an inlet end to an outlet end, and the gas phase crane pipe 1 is used for inputting nitrogen into the oil tank truck. The inlet end of the unloading liquid phase pipeline 14 is connected with the bottom liquid phase port 10, the outlet end of the unloading liquid phase pipeline 14 is connected with the oil unloading storage tank 16, and the unloading liquid phase pipeline 14 is sequentially provided with a liquid phase crane pipe 5, a filter 6, an unloading pump 7 and a liquid phase check valve 17 from the inlet end to the outlet end. Furthermore, a pump outlet valve 18 is arranged on the unloading liquid phase pipeline between the liquid phase check valve 17 and the oil unloading storage tank 16, a pump inlet valve 19 is arranged on the unloading liquid phase pipeline 14 between the filter 6 and the liquid phase crane pipe 5, and if the unloading pump 7 breaks down, the pump outlet valve and the pump inlet valve can be closed, so that the unloading pump can be maintained or replaced. The filter is used for preventing impurity entering unloading pump, and the liquid phase check valve is used for preventing oil refluence to in the pump.

Furthermore, a purging port 8 is connected to the unloading liquid phase pipeline 14 between the pump outlet valve 18 and the liquid phase check valve 17, the purging port 8 is provided with a quick connector, the pump outlet valve 18 is kept in an open state when purging is needed due to the fact that a pipeline between the unloading pump and the oil unloading storage tank is long, nitrogen is introduced into the purging port through the quick connector and is purged towards the oil unloading storage tank, and oil in the pipeline at the rear end of the pump is cleaned.

In this embodiment, the unloading pump 7 and the pressure reducing valve 4 are controlled in a linkage manner, and when the unloading pump 7 is started, the pressure reducing valve 4 needs to be opened in a linkage manner at the same time, so as to ensure the gas-liquid balance in the tank wagon. The oil tank truck is provided with a pressure detection meter for monitoring the internal pressure of the oil tank, and when the pressure detection meter detects that the internal pressure of the oil tank truck is higher than a limit value, the stop-and-unload pump 7 is interlocked immediately and the flow limiting valve 3 is closed, so that the occurrence of hazard accidents caused by the overpressure of the oil tank truck is prevented; the unloading pump 7 and the flow restriction valve 3 are thus also controlled in an interlocking manner. The nitrogen with pressure in the low-pressure nitrogen pipe network or the nitrogen buffer tank is decompressed through a decompression valve 4, and then enters the oil tank truck through a flow limiting valve 3, a check valve 2 and a gas phase crane pipe 1 to reduce the liquid level of the oil tank truck in the process of supplementing and unloading oil and increase the gas volume of a gas phase space, and the decompression valve 4 is used for ensuring the pressure loss of the flow limiting valve 3, the check valve 2 and the pipeline, so that the nitrogen entering the oil tank truck can keep micro-positive pressure. The flow of the flow-limiting valve 3 is consistent with the flow of the unloading pump 7, and the gas-liquid phase balance of the oil tank truck is controlled. The check valve 2 is used for preventing oil gas in the gas phase space of the oil tank truck from entering a low-pressure nitrogen pipe network or a nitrogen buffer tank.

The utility model discloses the during operation, tank wagon 12 unloads oil to unloading storage tank 16 through unloading liquid phase pipeline 14, the unloading in-process unloading gas phase pipeline 13 provides nitrogen gas for tank wagon oil tank that oils, and the increasing tolerance of tank wagon liquid level decline gas phase space prevents that the air from getting into the tank wagon in the oil unloading process, avoids forming explosive gas mixture between oil tank liquid level and the top gas port 9. If the pressure detection meter detects overpressure in the oil unloading process, the unloading pump 7 and the flow limiting valve 3 are closed in a linkage mode, so that the oil tank truck is prevented from causing damage accidents due to overpressure.

The above description is only a preferred embodiment of the present invention, and any person skilled in the art can easily modify, change or modify the above embodiments according to the technical spirit of the present invention without departing from the scope of the present invention.

Claims

1. The utility model provides a novel tank wagon system of unloading which characterized in that: the unloading device comprises an oil tank truck, an unloading gas-phase pipeline and an unloading liquid-phase pipeline, wherein the oil tank truck is provided with a top gas-phase port and a bottom liquid-phase port, the inlet end of the unloading gas-phase pipeline is communicated with a nitrogen source, the outlet end of the unloading gas-phase pipeline is communicated with the top gas-phase port, and a pressure reducing valve, a flow limiting valve, a gas-phase check valve and a gas-phase loading arm are sequentially arranged on the unloading gas-phase pipeline from the inlet end to the outlet end; the inlet end of the unloading liquid phase pipeline is communicated with the bottom liquid phase port, the outlet end of the unloading liquid phase pipeline is communicated with the oil unloading storage tank, and a liquid phase crane pipe, a filter, an unloading pump and a liquid phase check valve are sequentially arranged on the unloading liquid phase pipeline from the inlet end to the outlet end; the unloading pump and the pressure reducing valve are controlled in an interlocking manner.

2. The novel tank wagon unloading system as claimed in claim 1, wherein: the nitrogen source is a low-pressure nitrogen pipe network or a nitrogen buffer tank.

3. The novel tank wagon unloading system as claimed in claim 1, wherein: a pump outlet valve is arranged on the unloading liquid phase pipeline between the liquid phase check valve and the oil unloading storage tank, and a pump inlet valve is arranged on the unloading liquid phase pipeline between the filter and the liquid phase loading arm.

4. The novel tank wagon unloading system as claimed in claim 1, wherein: and a purging port is also connected on the unloading liquid phase pipeline between the pump outlet valve and the liquid phase check valve.

5. The novel tank wagon unloading system as claimed in claim 1, wherein: and the oil tank truck is provided with a pressure detection meter for monitoring the internal pressure of the oil tank.

6. The novel oil tank truck unloading system as claimed in claim 5, characterized in that: and the unloading pump and the flow limiting valve are controlled in an interlocking manner, and when the pressure detection meter detects that the internal pressure of the oil tank truck is higher than a limit value, the unloading pump and the flow limiting valve are immediately closed in an interlocking manner.