CN213840493U

CN213840493U - Closed unloading system for normal pressure tank car

Info

Publication number: CN213840493U
Application number: CN202022914644.5U
Authority: CN
Inventors: 何川; 代丹
Original assignee: LUOYANG RUIZE PETROCHEMICAL ENGINEERING CO LTD
Current assignee: LUOYANG RUIZE PETROCHEMICAL ENGINEERING CO LTD
Priority date: 2020-12-04
Filing date: 2020-12-04
Publication date: 2021-07-30
Anticipated expiration: 2030-12-04

Abstract

A closed unloading system for an atmospheric tank car comprises a nitrogen main pipe and a plurality of tank cars, wherein the top of each tank car is provided with a discharge port, and the bottom of each tank car is provided with a gas phase port and a liquid phase port; each tank truck is communicated with the buffer tank through a liquid phase crane pipe and a buffer tank inlet pipeline in sequence, and a liquid phase crane pipe operation valve and a tank root valve are arranged on the liquid phase crane pipe; the buffer tank is communicated with an inlet of the unloading pump through an inlet line of the unloading pump, and the unloading pump is communicated with the outlet bus through an outlet line of the unloading pump; the system is simple in design, reduces occupational hazards to workers, and can automatically transfer residual oil in the tank truck to the buffer tank oil by taking nitrogen as driving force in time, so that waste of oil products is avoided.

Description

Closed unloading system for normal pressure tank car

Technical Field

The utility model belongs to petrochemical oil warehousing and transportation light oil field of unloading, in particular to be used for airtight system of unloading of ordinary pressure tank car.

Background

The method for unloading oil is mainly characterized by utilizing the height difference between a tank car and a buffer tank, adopting open self-flow oil unloading and also using an unloading pump to unload oil. Regardless of the manner in which the oil is removed, a large amount of oil vapor escapes through the tank's drain and blow-off lines. These oil vapors can easily form explosive mixtures with air and can ignite or explode when exposed to a fire source. Meanwhile, the volatilization of oil gas in the oil unloading process causes inconvenience to the treatment of the environment-friendly VOCS.

The tank car discharge port needs to be opened to unload in the oil unloading process of the normal pressure tank car, oil gas is volatilized greatly, and when oil gas is volatilized in a large amount, fire and explosion can occur after meeting static electricity and naked flame, environmental pollution and waste of oil products are caused simultaneously, and the harm to the human body caused by the suction of volatile gas avoids the occurrence of major accidents, so that the design of a set of closed unloading system of the normal pressure tank car is urgently needed.

Disclosure of Invention

In order to overcome the defects, the utility model aims to provide a system which does not leave residual oil in the tank car when unloading the normal pressure tank car in a closed way, and has wide use and convenient operation.

The utility model aims at adopting the following technical scheme to realize. According to the utility model provides a be used for airtight unloading system of ordinary pressure tank car, including nitrogen gas house steward and a plurality of tank cars that the top was provided with the discharge port, the bottom was provided with gaseous phase mouth and liquid phase mouth, be provided with a plurality of nitrogen gas branch pipes with tank car one-to-one on the nitrogen gas house steward, each tank car loops through gaseous phase oil filling riser and nitrogen gas branch pipe and is linked together with the nitrogen gas house steward, set up instrument regulating valve and pressure transmitter that is used for detecting the tank car internal pressure on each nitrogen gas branch pipe; each tank truck is communicated with the buffer tank through a liquid phase crane pipe and a buffer tank inlet pipeline in sequence, and a liquid phase crane pipe operation valve and a tank root valve are arranged on the liquid phase crane pipe; the buffer tank is communicated with an inlet of the unloading pump through an inlet line of the unloading pump, and the unloading pump is communicated with an outlet bus through an outlet line of the unloading pump.

Furthermore, a nitrogen main valve and a pressure reducing valve are arranged on the nitrogen main pipe.

Further, the inlet end and the outlet end of the instrument regulating valve are both provided with maintenance valves.

Furthermore, an emptying pipe is arranged between the instrument regulating valve and the maintenance valve positioned at the outlet end of the instrument regulating valve, and an emptying valve for controlling the opening and closing state of the emptying pipe is arranged on the emptying pipe.

Furthermore, a buffer tank liquid level meter and an audible and visual alarm are arranged on the buffer tank.

Furthermore, an inlet valve and an outlet valve of the unloading pump are arranged at the inlet end and the outlet end of the unloading pump.

Borrow by above-mentioned technical scheme, the utility model has the advantages that: the system is simple in design, and after the vehicle is unloaded in a sealed manner, on one hand, nitrogen is used as an inert gas to effectively isolate oxygen, so that an explosive gas space is avoided, the phenomenon of environmental pollution caused by volatilization of oil gas into air is reduced, the concentration of the oil gas in an operating environment is reduced, and the occupational hazard to workers is reduced; meanwhile, residual oil in the tank car can be automatically transferred to the buffer tank oil in time by taking nitrogen as driving force, so that waste of oil products is avoided. When low liquid level appears in the buffer tank, the buffer tank can automatically close a valve to stop a pump and supplement nitrogen to adjust the pressure balance in the tank car, and the potential safety hazard caused by suction and suffocation of the tank car is effectively prevented.

The foregoing description is only an overview of the technical solutions of the present invention, and in order to make the technical means of the present invention more clearly understood, the present invention may be implemented according to the content of the description, and in order to make the above and other objects, features, and advantages of the present invention more obvious and understandable, the following preferred embodiments are described in detail with reference to the accompanying drawings.

Drawings

FIG. 1 is a schematic structural diagram of a closed unloading system of an atmospheric pressure tank truck.

[ reference numerals ]

1-nitrogen main valve, 2-pressure reducing valve, 3-nitrogen main pipe, 4-nitrogen branch pipe, 5-instrument regulating valve, 6-gas phase operation valve, 7-emptying pipe, 8-emptying valve, 9-maintenance valve, 10-pressure loosening device, 11-gas phase crane pipe, 12-gas phase port, 13-liquid phase port, 14-tank truck, 15-liquid phase crane pipe, 16-tank root valve, 17-buffer tank inlet pipeline, 18-buffer tank, 19-unloading pump inlet pipeline, 20-unloading pump, 21-unloading pump outlet pipeline, 22-liquid phase crane pipe operation valve, 23-buffer tank liquidometer, 24-unloading pump inlet valve, 25-unloading pump outlet valve, 26-tank truck discharge port and 27-outlet main pipe.

Detailed Description

To further illustrate the technical means and effects of the present invention for achieving the objectives of the present invention, the following detailed description will be given with reference to the accompanying drawings and preferred embodiments of the present invention for a closed unloading system of an atmospheric tank car, its specific embodiments, structure, features and effects.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are used merely for convenience of description and for simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention.

Referring to fig. 1, the closed unloading system for the normal pressure tank car comprises a nitrogen main pipe 1 connected with a nitrogen generating device and a plurality of tank cars 14, wherein the top of each tank car 14 is provided with a tank car discharge port 26, and the bottom of each tank car 14 is provided with a gas phase port 12 and a liquid phase port 13; the nitrogen main pipe 1 is provided with a nitrogen main valve 1 and a pressure reducing valve 2, the nitrogen main pipe 1 is also provided with a plurality of nitrogen branch pipes 4, each nitrogen branch pipe 4 corresponds to one tank truck 14, each tank truck 14 is communicated with the nitrogen main pipe 1 sequentially through a gas phase crane pipe 11 and one nitrogen branch pipe 4, one end of the gas phase crane pipe 11, which is far away from the nitrogen branch pipe 4, is communicated with a gas phase port 12 of the tank truck 14, the nitrogen branch pipe 4 is sequentially provided with an instrument regulating valve 5 and a pressure transmitter 10 for detecting the pressure in the tank truck 14 from the nitrogen main pipe 1 to the gas phase crane pipe 11, the inlet end and the outlet end of the instrument regulating valve 5 are respectively provided with an inspection valve 9, the inspection valve 9 is a normally open valve, an emptying pipe 7 is also arranged between the instrument regulating valve 5 and the inspection valve 9 at the outlet end of the instrument regulating valve, and an emptying valve 8 for controlling the opening and closing state of the emptying pipe 7 is arranged on the emptying pipe; when the pressure in the tank truck 4 is lower than 0.05MPa, the instrument regulating valve 5 is opened, the nitrogen generating device replenishes nitrogen for the tank truck 14, the pressure in the tank truck 14 is maintained at 0.1MPa, and when the pressure transmitter 10 detects that the pressure in the tank truck 14 reaches 0.1MPa, the instrument regulating valve 5 is closed; when the instrument regulating valve 5 needs to be maintained, the two maintenance valves 9 at the inlet end and the outlet end of the instrument regulating valve are closed, the discharge valve 8 is opened, and the nitrogen between the maintenance valves 9 is decompressed and exhausted through the exhaust pipe 7 and then the instrument regulating valve 5 is maintained or replaced.

Each tank truck 14 is communicated with a buffer tank 18 sequentially through a liquid phase crane pipe 15 and a buffer tank inlet pipeline 17, one end of the liquid phase crane pipe 15 is connected with a liquid phase port 13, the other end of the liquid phase crane pipe is communicated with the buffer tank inlet pipeline 17, and one end, far away from the liquid phase crane pipe 15, of the buffer tank inlet pipeline 17 is communicated with the buffer tank 18; a liquid phase loading arm operating valve 22 and a tank root valve 16 are sequentially arranged on the liquid phase loading arm 15 along the direction from the tank car 14 to the buffer tank inlet pipeline 17, and the tank root valve 16 is a normally open valve; the buffer tank 18 is provided with a buffer tank liquid level meter 23 and an audible and visual alarm, the bottom of the buffer tank 18 is connected with the inlet end of an unloading pump 20 through an unloading pump inlet line 19, the outlet end of the unloading pump 20 is communicated with an outlet header pipe 27 through an unloading pump outlet line 21, and one end of the outlet header pipe 27, which is far away from the unloading pump outlet line 21, is connected with an oil tank area; the inlet end and the outlet end of the unloading pump 20 are respectively provided with an unloading pump inlet valve 24 and an unloading pump outlet valve 25, and the buffer tank liquid level meter 23 is in interlocking control with the unloading pump 20 and the unloading pump outlet valve 25; when the buffer tank 18 reaches the set low liquid level, the sound and light alarm is given on site, and when the buffer tank 18 reaches the set lowest liquid level, the buffer tank liquid level meter 23 closes the outlet valve 25 in an interlocking manner and then stops the unloading pump 20 for 1min, so that the safety production accident caused by the tank car 14 being sucked and held down due to the untimely site operation is effectively prevented.

The nitrogen main valve 1 is opened, the pressure of nitrogen is reduced to 0.1MPa by the pressure reducing valve 2, the liquid phase oil filling riser operation valve 22 is opened while the gas phase operation valve is closed, oil in the tank car 14 rapidly enters the buffer tank 18 under the pushing of the nitrogen pressure, after the oil enters the buffer tank 18, the unloading pump 20 is started after the unloading pump inlet valve 24 is opened, after the unloading pump 20 runs for 1min, the unloading pump outlet valve 25 is opened, and the oil is collected to the outlet main pipe 27 through the unloading tank outlet line 21 and then is sent to an oil tank area.

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 be used for airtight unloading system of ordinary pressure tank car which characterized in that: the system comprises a nitrogen main pipe and a plurality of tank trucks, wherein the top of each tank truck is provided with a discharge port, and the bottom of each tank truck is provided with a gas phase port and a liquid phase port; each tank truck is communicated with the buffer tank through a liquid phase crane pipe and a buffer tank inlet pipeline in sequence, and a liquid phase crane pipe operation valve and a tank root valve are arranged on the liquid phase crane pipe; the buffer tank is communicated with an inlet of the unloading pump through an inlet line of the unloading pump, and the unloading pump is communicated with an outlet bus through an outlet line of the unloading pump.

2. The system for the airtight unloading of the atmospheric tank car as claimed in claim 1, wherein: the nitrogen main pipe is provided with a nitrogen main valve and a pressure reducing valve.

3. The system for the airtight unloading of the atmospheric tank car as claimed in claim 1, wherein: and the inlet end and the outlet end of the instrument regulating valve are both provided with maintenance valves.

4. The system for the airtight unloading of the atmospheric tank car as claimed in claim 1, wherein: an emptying pipe is also arranged between the instrument regulating valve and the maintenance valve positioned at the outlet end of the instrument regulating valve, and an emptying valve for controlling the opening and closing state of the emptying pipe is arranged on the emptying pipe.

5. The system for the airtight unloading of the atmospheric tank car as claimed in claim 1, wherein: the buffer tank is provided with a buffer tank liquid level meter and an audible and visual alarm.

6. The system for the airtight unloading of the atmospheric tank car as claimed in claim 1, wherein: the inlet end and the outlet end of the unloading pump are provided with an unloading pump inlet valve and an unloading pump outlet valve.