CN112555676A - Ultra-low temperature liquid pressurization unloading device and method - Google Patents

Ultra-low temperature liquid pressurization unloading device and method Download PDF

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Publication number
CN112555676A
CN112555676A CN202011455641.8A CN202011455641A CN112555676A CN 112555676 A CN112555676 A CN 112555676A CN 202011455641 A CN202011455641 A CN 202011455641A CN 112555676 A CN112555676 A CN 112555676A
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CN
China
Prior art keywords
unloading
liquid phase
valve
booster
supercharger
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Granted
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CN202011455641.8A
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Chinese (zh)
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CN112555676B (en
Inventor
王耀武
杜利霞
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Shaanxi Rongke Cryogenic Equipment Co ltd
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Shaanxi Rongke Cryogenic Equipment Co ltd
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Priority to CN202011455641.8A priority Critical patent/CN112555676B/en
Publication of CN112555676A publication Critical patent/CN112555676A/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C7/00—Methods or apparatus for discharging liquefied, solidified, or compressed gases from pressure vessels, not covered by another subclass
    • F17C7/02—Discharging liquefied gases
    • F17C7/04—Discharging liquefied gases with change of state, e.g. vaporisation
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60P—VEHICLES ADAPTED FOR LOAD TRANSPORTATION OR TO TRANSPORT, TO CARRY, OR TO COMPRISE SPECIAL LOADS OR OBJECTS
    • B60P3/00—Vehicles adapted to transport, to carry or to comprise special loads or objects
    • B60P3/22—Tank vehicles
    • B60P3/224—Tank vehicles comprising auxiliary devices, e.g. for unloading or level indicating
    • B60P3/2245—Adaptations for loading or unloading
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C13/00—Details of vessels or of the filling or discharging of vessels
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2221/00—Handled fluid, in particular type of fluid
    • F17C2221/03—Mixtures
    • F17C2221/032—Hydrocarbons
    • F17C2221/033—Methane, e.g. natural gas, CNG, LNG, GNL, GNC, PLNG
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2223/00—Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel
    • F17C2223/01—Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel characterised by the phase
    • F17C2223/0146—Two-phase
    • F17C2223/0153—Liquefied gas, e.g. LPG, GPL
    • F17C2223/0161—Liquefied gas, e.g. LPG, GPL cryogenic, e.g. LNG, GNL, PLNG
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2227/00—Transfer of fluids, i.e. method or means for transferring the fluid; Heat exchange with the fluid
    • F17C2227/03—Heat exchange with the fluid
    • F17C2227/0302—Heat exchange with the fluid by heating
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2227/00—Transfer of fluids, i.e. method or means for transferring the fluid; Heat exchange with the fluid
    • F17C2227/03—Heat exchange with the fluid
    • F17C2227/0367—Localisation of heat exchange
    • F17C2227/0388—Localisation of heat exchange separate
    • F17C2227/039—Localisation of heat exchange separate on the pipes

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Transportation (AREA)
  • Filling Or Discharging Of Gas Storage Vessels (AREA)

Abstract

The invention discloses an ultralow-temperature liquid pressurization unloading device and method, and particularly discloses an ultralow-temperature liquid pressurization gas island unloading device and method, an ultralow-temperature liquid pressurization mutual-backup unloading device, a multi-unit pressurization mutual-backup gas island unloading device and an unloading method. The ultra-low temperature liquid pressurization gas island unloading device comprises a pressurization gas island unit consisting of a supercharger, a supercharger fluid inlet pipeline, a supercharger fluid outlet pipeline, a tank car liquid phase interface and a tank car gas phase interface, the tank car is pressurized and unloaded through the pressurization gas island unit, the pressure required by unloading the tank car can be quickly reached, the unloading time is saved, energy conservation and consumption reduction are realized, the ultra-low temperature liquid pressurization is mutually equipped with the unloading device, the common or switched superchargers are realized through the pressurization mutually equipped unit, the requirement of quick replacement of the superchargers such as required maintenance deicing and the like can be met, and quick unloading is realized.

Description

Ultra-low temperature liquid pressurization unloading device and method
Technical Field
The invention belongs to the technical field of liquefied natural gas, and particularly relates to an ultralow-temperature liquid pressurization unloading device and method.
Background
Ultralow temperature liquid such as Liquefied Natural Gas (LNG) is one of important energy sources in energy supply in China, most of the LNG is transported by tank cars, and the existing liquefied natural gas tank car unloading mainly adopts a pump pressurization unloading mode or a self-pressurization unloading mode.
The pump pressure boost unloading can improve the unloading speed after the unloading pump well runs because of having used the unloading pump, but because the restriction of ultra-low temperature liquid physical property itself, easily gasification causes pump cavitation, consequently, uses the pump pressure boost unloading just to need carry out abundant precooling to the unloading pump. The problem that pump pressure boost unloading needs to be solved is how to make the pump of unloading can be quick accomplish the precooling, and the improvement of pump precooling efficiency lies in how to improve tank wagon pressure fast, makes liquid in the tank wagon get into the pump of unloading fast and carries out the precooling of pump. Therefore, how to accelerate the pressurization speed of the tank car is the key for improving the precooling speed of the unloading pump when the unloading pump precools, and the key for further improving the unloading speed on the basis of using the pump pressurization unloading mode.
The self-pressurization unloading is that fluid in a tank car is gasified by a vaporizer and the like and then returns to the tank car to pressurize the tank car, the self-pressurization mode usually needs multiple pipelines to be connected, the process that the fluid in the tank car flows in the pipelines and is gasified and then returns to the tank car to pressurize the tank car usually needs longer time, the prior experience shows that the unloading time of a 50-cubic tank car is about 3-4 hours, and the device and the method for accelerating the self-pressurization of the tank car are researched and developed, and are key for solving the problem of quick unloading of the ultralow-temperature liquid tank car.
Disclosure of Invention
The invention aims to solve the technical problem of providing an ultralow-temperature liquid pressurization unloading device and method aiming at the defects of the prior art. The ultra-low temperature liquid pressurization unloading device comprises an ultra-low temperature liquid pressurization gas island unloading device, an ultra-low temperature liquid pressurization mutual backup unloading device and a multi-unit pressurization mutual backup gas island unloading device, wherein the ultra-low temperature liquid pressurization gas island unloading device comprises a pressurization gas island unit consisting of a pressurizer, a pressurizer fluid inlet pipeline, a pressurizer fluid outlet pipeline, a tank car liquid phase interface and a tank car gas phase interface, and the tank car is pressurized and unloaded through the pressurization gas island unit, so that the pressure required by the unloading of the tank car can be quickly reached, the unloading time is saved, and the energy conservation and consumption reduction are realized; the ultra-low temperature liquid pressurization mutual backup unloading device realizes sharing or switching of the pressurizer through the pressurization mutual backup unit, can meet the requirement of quickly replacing the pressurizer needing maintenance, deicing and other treatment, and realizes quick unloading; the multi-unit pressurization mutual-backup gas island unloading device can realize the simultaneous liquid unloading of a plurality of tank cars by using the gas islands, and has high efficiency and quick unloading.
In order to solve the technical problems, the invention adopts the technical scheme that: the super-low temperature liquid pressurization gas island unloading device comprises a storage tank and is characterized by further comprising a pressurization gas island unit, wherein the pressurization gas island unit comprises a pressurizer, a pressurizer fluid inlet pipeline, a pressurizer fluid outlet pipeline, and a tank car liquid phase interface and a tank car gas phase interface which are respectively connected with a tank car filled with super-low temperature liquid to be unloaded;
the liquid phase interface of the tank car is arranged on a fluid inlet pipeline of the supercharger, and one end of the fluid inlet pipeline of the supercharger, which is far away from the liquid phase interface of the tank car, is communicated with an inlet of the supercharger;
the tank car gas phase interface is arranged on a fluid outlet pipeline of the supercharger, and one end of the fluid outlet pipeline of the supercharger, which is far away from the tank car gas phase interface, is communicated with an outlet of the supercharger;
a first check valve is arranged on the fluid inlet pipeline of the supercharger;
a gas island valve and an unloading crane pipe gas phase arm are arranged on the fluid outlet pipeline of the supercharger, the gas island valve is close to the outlet of the supercharger, and the unloading crane pipe gas phase arm is close to a tank car gas phase interface;
and a loading arm gas-phase arm valve is arranged on the unloading loading arm gas-phase arm.
The ultra-low temperature liquid pressurization gas island unloading device is characterized by further comprising an unloading liquid phase main pipe, wherein one end of the unloading liquid phase main pipe is provided with a tank car liquid unloading interface communicated with a tank car liquid unloading port, and one end of the unloading liquid phase main pipe, which is far away from the tank car liquid unloading interface, is communicated with a storage tank;
the unloading oil filling riser liquid phase arm and the unloading pump are arranged on the unloading liquid phase main pipe; furthermore, the position of the unloading pump on the unloading liquid phase main pipe is positioned between the unloading arm and the storage tank;
the unloading pump is connected with the unloading main liquid pipe, the unloading pump is connected with the storage tank, the unloading pump is connected with the unloading pump, and the pressure booster is connected with the unloading pump;
the liquid phase branch is provided with a second check valve and a liquid phase branch valve, and the position of the second check valve on the liquid phase branch is positioned between the liquid phase branch and the liquid phase branch valve and the connection point of the liquid phase branch and the fluid inlet pipeline of the supercharger;
and a fluid inlet pipeline valve of the supercharger is arranged on the fluid inlet pipeline of the supercharger. The position of the liquid phase branch valve on the liquid phase branch is positioned between a connecting point of the liquid phase branch and the unloading liquid phase main pipe and the second check valve;
the ultra-low temperature liquid pressurization gas island unloading device is characterized in that the fluid inlet pipeline of the pressurizer comprises a pressurizer inlet pipeline and a liquid phase outlet pipeline, wherein one end of the pressurizer inlet pipeline is communicated with one end of the liquid phase outlet pipeline;
the liquid phase interface of the tank car is arranged at one end of the liquid phase outlet pipeline, which is far away from the inlet pipeline of the supercharger, and one end of the inlet pipeline of the supercharger, which is far away from the liquid phase outlet pipeline, is connected to the inlet of the supercharger;
the first check valve and the supercharger fluid inlet pipeline valve are both arranged on the liquid phase outlet pipeline, and the supercharger fluid inlet pipeline valve is positioned between the tank car liquid phase interface and the first check valve on the liquid phase outlet pipeline.
The ultra-low temperature liquid pressurization gas island unloading device is characterized by further comprising a gas phase pipeline, wherein one end of the gas phase pipeline is connected to a fluid outlet pipeline of the pressurizer, a connection point is located between a gas phase arm of an unloading arm and a gas island valve, and the other end of the gas phase pipeline is communicated with a storage tank;
and a gas phase valve is arranged on the gas phase pipeline.
The ultra-low temperature liquid pressurization gas island unloading device is characterized in that a plurality of pressurization gas island units are arranged, and a first booster pipeline and a second booster pipeline are arranged among the pressurization gas island units;
the first booster pipeline is communicated with each booster fluid inlet pipeline, each booster fluid inlet pipeline is provided with a mutual boosting and backup switching valve, and the position of the mutual boosting and backup switching valve on the corresponding booster fluid inlet pipeline is positioned between the connection point of the first booster pipeline and the corresponding booster fluid inlet pipeline and the inlet of the corresponding booster;
the booster second lines communicate with each booster fluid outlet line, and the connection point of each booster second line on the respective booster fluid outlet line is located between the outlet of the respective booster and the respective air island valve.
Furthermore, a booster mutual-backup pipeline valve is arranged on the second pipeline of the booster.
In addition, the invention provides a method for unloading by adopting the ultralow-temperature liquid pressurized gas island unloading device, which is characterized by comprising the following steps of:
step one, carrying out self-pressurization and pre-cooling of an unloading pump on a tank car filled with ultra-low temperature liquid to be unloaded: opening a liquid phase branch valve, a booster fluid inlet pipeline valve, a gas island valve and a crane pipe gas phase arm valve, starting a booster, and not starting an unloading pump;
liquid fluid in the tank car is divided into two paths, wherein one path flows into the supercharger from a liquid phase interface of the tank car through a fluid inlet pipeline of the supercharger and flows back to the tank car through a fluid outlet pipeline of the supercharger, a gas phase arm of an unloading crane pipe and a gas phase interface of the tank car;
the other path of the liquid fluid in the tank car enters the unloading liquid phase main pipe from the tank car unloading interface, and flows through the unloading pump to pre-cool the unloading pump, and when the temperature of the fluid in the unloading pump is less than or equal to minus 120 ℃, the pre-cooling of the unloading pump is completed;
step two, unloading: closing a fluid inlet pipeline valve of a pressurizer, maintaining a liquid phase branch valve, a gas island valve and a loading arm gas phase arm valve to be opened, starting an unloading pump, enabling liquid in a tank car to enter an unloading liquid phase main pipe from a tank car unloading interface, flowing through the unloading pump on the unloading liquid phase main pipe and then dividing into two branches, enabling fluid in one branch to flow into the pressurizer from the liquid phase branch, flowing back to the tank car through a tank car gas phase interface through a fluid outlet pipeline of the pressurizer and a gas phase arm of the unloading loading arm to be pressurized, and enabling fluid in the other branch to flow into a storage tank along the unloading liquid phase main pipe under the combined action of the pressurization and the unloading pump;
step three, forming a gas island: and after unloading is finished, the liquid phase branch valve and the gas island valve are closed, the pipeline valve of the fluid inlet of the supercharger is kept closed, a gas island is formed under the action of the gas island valve, the first check valve and the second check valve, and the gas island is a space for storing fluid formed under the action of the gas island valve, the first check valve and the second check valve.
The gas island comprises a closed section of a fluid outlet pipeline of the supercharger, a closed section of a fluid inlet pipeline of the supercharger and a closed section of a liquid phase branch, and the closed section of the fluid outlet pipeline of the supercharger is a valve from the outlet of the supercharger to the gas island; the closed section of the fluid inlet pipeline of the supercharger is from the inlet of the supercharger to the first check valve; the liquid phase branch closed section is from the joint of the liquid phase branch and a fluid inlet pipeline of the supercharger to the second check valve;
the method further includes pressurizing a second tank car by using the air island in the third step, and specifically includes: opening a liquid phase branch valve, a pressurizer fluid inlet pipeline valve and a gas island valve, opening a crane pipe gas phase arm valve, opening a pressurizer, enabling the fluid in the gas island, the fluid from the second tank car through a liquid phase outlet pipeline and the pressurizer and the fluid from the second tank car through the liquid phase branch and the pressurizer to jointly enter the second tank car for pressurization, and closing the pressurizer fluid inlet pipeline valve when the temperature of the fluid in the unloading pump is less than or equal to-120 ℃;
and unloading the second tank car according to the steps.
As another aspect of the invention, the invention provides an ultralow temperature liquid pressurization mutual backup unloading device, which comprises a storage tank and is characterized by further comprising a pressurization mutual backup unit, wherein the pressurization mutual backup unit comprises a first supercharger, a second supercharger, a first supercharger fluid inlet pipeline, a first supercharger fluid outlet pipeline, a second supercharger fluid inlet pipeline, a second supercharger fluid outlet pipeline, a supercharger first pipeline, a supercharger second pipeline, and a tank car liquid phase interface and a tank car gas phase interface which are respectively connected with a tank car filled with ultralow temperature liquid to be unloaded;
the tank car liquid phase interface is arranged on the first supercharger fluid inlet pipeline, and one end, far away from the tank car liquid phase interface, of the first supercharger fluid inlet pipeline is communicated with an inlet of the first supercharger;
the tank car gas phase interface is arranged on a first booster fluid outlet pipeline, and one end, far away from the tank car gas phase interface, of the first booster fluid outlet pipeline is communicated with an outlet of the first booster;
one end of the first booster line is communicated with the first booster fluid inlet line, and the other end of the first booster line is communicated with the second booster fluid inlet line;
one end of the second booster pipeline is communicated with the first booster fluid outlet pipeline, and the other end of the second booster pipeline is communicated with the second booster fluid outlet pipeline;
and the first supercharger fluid inlet pipeline and the second supercharger fluid inlet pipeline are respectively provided with a supercharging mutual-backup switching valve. The connection point of the booster bypass switching valve on the respective booster fluid inlet line is located between the connection point of the booster first line on the respective booster fluid inlet line and the inlet of the respective booster.
The ultra-low temperature liquid pressurization mutual backup unloading device is characterized by further comprising an unloading liquid phase main pipe, wherein one end of the unloading liquid phase main pipe is provided with a tank car liquid unloading interface communicated with a tank car liquid unloading port, and one end of the unloading liquid phase main pipe, which is far away from the tank car liquid unloading interface, is communicated with a storage tank;
the unloading oil filling riser liquid phase arm and the unloading pump are arranged on the unloading liquid phase main pipe;
the unloading pump is connected with the unloading main liquid pipe, the unloading pump is connected with the storage tank, the unloading pump is connected with the unloading pump, and the unloading pump is connected with the first booster fluid inlet pipeline;
a second check valve is arranged on the liquid phase branch;
the connection point of the booster first line on the first booster fluid inlet line is located between the connection point of the liquid phase branch and the first booster fluid inlet line and the inlet of the first booster.
Further, foretell mutual device of unloading of being equipped with of super low temperature liquid pressure boost, its characterized in that, be provided with liquid phase branch road valve on the liquid phase branch road, the position of liquid phase branch road valve on the liquid phase branch road is located between tie point and the second check valve that liquid phase branch road and the liquid phase of unloading are responsible for.
Furthermore, the ultra-low temperature liquid pressurization mutual backup unloading device is characterized in that,
the unloading arm is arranged on the first supercharger fluid outlet pipeline and is close to the outlet of the first supercharger;
a loading arm gas phase arm valve is arranged on the unloading loading arm gas phase arm;
the connection point of the second booster line to the first booster fluid outlet line is located between the air island valve and the outlet of the first booster;
and a first check valve is arranged on the first supercharger fluid inlet pipeline.
Further, foretell mutual device of unloading of being equipped with of super low temperature liquid pressure boost, its characterized in that be provided with the mutual pipeline valve of being equipped with of booster on the booster second pipeline.
Further, the ultra-low temperature liquid pressurization mutual backup unloading device is characterized in that the first pressurizer fluid inlet pipeline comprises a first pressurizer inlet pipeline and a first liquid phase outlet pipeline, one end of the first pressurizer inlet pipeline is communicated with one end of the first liquid phase outlet pipeline,
the tank car liquid phase interface is arranged at one end, far away from the first booster inlet pipeline, of the first liquid phase outlet pipeline, and one end, far away from the first liquid phase outlet pipeline, of the first booster inlet pipeline is connected to the inlet of the first booster;
a first booster fluid inlet pipeline valve is arranged on the first liquid phase outlet pipeline, and the position of the first booster fluid inlet pipeline valve on the first liquid phase outlet pipeline is positioned between the tank car liquid phase interface and the first check valve;
further, the ultralow-temperature liquid pressurization mutual-backup unloading device is characterized by further comprising a first gas-phase pipeline, wherein one end of the first gas-phase pipeline is connected to a first pressurizer fluid outlet pipeline, a connection point is located between a gas-phase arm of an unloading arm and a gas island valve, and the other end of the first gas-phase pipeline is communicated with a storage tank;
and a first gas phase valve is arranged on the first gas phase pipeline.
As another aspect of the invention, the invention also provides a multi-unit supercharging mutual air-backup island unloading device, which comprises a storage tank, and is characterized by further comprising a plurality of supercharging units, and a first booster pipeline and a second booster pipeline which are arranged among the plurality of supercharging units;
each pressurizing unit comprises a pressurizing air island unit and a pressurizing liquid unit;
each pressurizing gas island unit comprises a pressurizer, a pressurizer fluid inlet pipeline, a pressurizer fluid outlet pipeline, and a tank car liquid phase interface and a tank car gas phase interface which are respectively connected with a tank car filled with ultra-low temperature liquid to be unloaded;
each tank car liquid phase interface is arranged on a corresponding supercharger fluid inlet pipeline, and one end, far away from the corresponding tank car liquid phase interface, of the supercharger fluid inlet pipeline is communicated with an inlet of a corresponding supercharger;
each tank car gas-phase interface is arranged on a corresponding pressurizer fluid outlet pipeline, and one end, far away from the corresponding tank car gas-phase interface, of the pressurizer fluid outlet pipeline is communicated with an outlet of a corresponding pressurizer;
a first check valve is arranged on each supercharger fluid inlet pipeline;
each pressurizer fluid outlet pipeline is provided with a gas island valve and an unloading crane pipe gas phase arm, the gas island valve is close to the outlet of the corresponding pressurizer, and the unloading crane pipe gas phase arm is close to the corresponding tank car gas phase interface;
each unloading crane pipe gas phase arm is provided with a crane pipe gas phase arm valve;
each hydraulic pressurizing unit comprises an unloading liquid phase main pipe, one end of each unloading liquid phase main pipe is provided with a tank car liquid unloading interface used for being communicated with a tank car liquid unloading port, and one end, far away from the tank car liquid unloading interface, of each unloading liquid phase main pipe is communicated with the storage tank; furthermore, a storage tank liquid phase opening is formed in the storage tank, a liquid phase header is connected to the storage tank liquid phase opening, and each unloading liquid phase main pipe is communicated with the storage tank through the liquid phase header;
each unloading main liquid phase pipe is provided with an unloading crane pipe liquid phase arm and an unloading pump, and further, the position of each unloading pump on the corresponding unloading main liquid phase pipe is positioned between the corresponding unloading crane pipe liquid phase arm and the storage tank;
each unloading main liquid phase pipe is connected with a liquid phase branch, the connection point of each liquid phase branch on the corresponding unloading main liquid phase pipe is positioned between the corresponding unloading pump and the storage tank, and one end of each liquid phase branch, which is far away from the corresponding unloading main liquid phase pipe, is communicated with a corresponding booster fluid inlet pipeline;
each liquid phase branch is provided with a second check valve;
the first booster line communicating with each booster fluid inlet line, the connection point of the first booster line on each booster fluid inlet line being located between the connection point of the respective liquid phase branch and the respective booster fluid inlet line and the inlet of the respective booster;
the booster second line communicates with each booster fluid outlet line, the connection point of the booster second line on each booster fluid outlet line being located between the respective air island valve and the outlet of the respective booster; furthermore, a plurality of booster mutual-backup pipeline valves are arranged on the booster second pipeline.
Each supercharger fluid inlet line is provided with a mutual boost switching valve, the position of each mutual boost switching valve on the corresponding supercharger fluid inlet line being located between the connection point of the first supercharger line on the corresponding supercharger fluid inlet line and the inlet of the corresponding supercharger.
Further, the multi-unit supercharging mutual-backup gas island unloading device is characterized in that each liquid phase branch is provided with a liquid phase branch valve, and the position of each liquid phase branch valve on the corresponding liquid phase branch is located between the connection point of the corresponding liquid phase branch and the corresponding unloading liquid phase main pipe and the corresponding second check valve;
furthermore, the multi-unit supercharging mutual-backup gas island unloading device is characterized in that each supercharger fluid inlet pipeline comprises a supercharger inlet pipeline and a liquid phase outlet pipeline, one end of each supercharger fluid inlet pipeline is communicated with one end of each liquid phase outlet pipeline, each tank car liquid phase interface is installed at one end, far away from the corresponding supercharger inlet pipeline, of the corresponding liquid phase outlet pipeline, and one end, far away from the corresponding liquid phase outlet pipeline, of each supercharger inlet pipeline is connected to the inlet of the corresponding supercharger;
each first check valve is arranged on the corresponding liquid phase outlet pipeline;
a booster fluid inlet pipeline valve is arranged on each liquid phase outlet pipeline;
furthermore, the multi-unit pressurization mutual-backup gas island unloading device is characterized by further comprising gas phase pipelines with the same number as the number of the pressurization units, wherein one end of each gas phase pipeline is connected to a corresponding fluid outlet pipeline of the pressurizer, a connecting point is located between a corresponding unloading arm and a corresponding gas island valve, and the other end of each gas phase pipeline is communicated with the storage tank; the storage tank is provided with a storage tank gas phase opening, the storage tank gas phase opening is connected with a gas phase header, and each gas phase pipeline is communicated with the storage tank through the gas phase header;
and each gas phase pipeline is provided with a gas phase valve.
In another aspect, the invention further provides a method for unloading by using the multi-unit supercharging mutual backup air island unloading device, which is characterized in that the plurality of supercharging units comprise a first supercharging unit and a second supercharging unit, the method comprises the steps of replacing a supercharger in the first supercharging unit with a supercharger in the second supercharging unit, and unloading by using the supercharger in the second supercharging unit, and the method specifically comprises the following steps:
step one, switching the superchargers and carrying out self-pressurization and pre-cooling of an unloading pump by using the switched superchargers: closing a pressurizing mutual-backup switching valve in the first pressurizing unit, opening a pressurizer in the second pressurizing unit and the pressurizing mutual-backup switching valve in the second pressurizing unit, opening a liquid phase branch valve in the first pressurizing unit, a fluid inlet pipeline valve of the pressurizer in the first pressurizing unit, an air island valve in the first pressurizing unit and an oil arm valve of an oil filling pipe in the first pressurizing unit, and closing an air island valve in the second pressurizing unit;
liquid fluid in the tank car is divided into two paths, wherein one path of the liquid fluid flows into a supercharger in a second supercharging unit from a tank car liquid phase interface in a first supercharging unit through a supercharger fluid inlet pipeline in the first supercharging unit and a supercharger first pipeline, and flows into the tank car through a supercharger second pipeline;
the other path of liquid fluid in the tank wagon enters a unloading liquid phase main pipe in the first pressurizing unit from a tank wagon unloading interface in the first pressurizing unit, flows through an unloading pump in the first pressurizing unit for precooling, and finishes precooling on the unloading pump when the temperature of the fluid in the unloading pump in the first pressurizing unit is less than or equal to minus 120 ℃;
step two, unloading: closing a pipeline valve at a fluid inlet of a pressurizer in a first pressurizing unit, keeping a liquid phase branch valve in the first pressurizing unit, an air island valve in the first pressurizing unit and an oil filling pipe gas phase arm valve in the first pressurizing unit open, starting an unloading pump in the first pressurizing unit, keeping a pressurizing mutual backup switching valve in the first pressurizing unit and an air island valve in a second pressurizing unit closed, enabling liquid in a tank car to enter a unloading liquid phase main pipe in the first pressurizing unit from a tank car unloading interface in the first pressurizing unit, flowing through the unloading pump in the first pressurizing unit and then dividing into two branches, enabling fluid in one branch to flow from the liquid phase branch in the first pressurizing unit to enter a pressurizer in the second pressurizing unit through a first pipeline of the pressurizer, flowing back to the tank car for pressurization through a second pipeline of the pressurizer and the air phase arm of the unloading oil filling pipe in the first pressurizing unit, and under the combined action of the pressurizing and the unloading pump in the first pressurizing unit, the fluid in the other branch continuously flows into the storage tank along the unloading liquid phase main pipe in the first pressurizing unit;
step three, forming a gas island: after unloading is finished, closing a liquid phase branch valve in the first pressurizing unit and an air island valve in the first pressurizing unit, keeping closing a fluid inlet pipeline valve of a pressurizer in the first pressurizing unit, an air phase valve in the first pressurizing unit and an air island valve in the second pressurizing unit, and forming an air island under the action of the air island valve in the first pressurizing unit, a first check valve in the first pressurizing unit and a second check valve in the first pressurizing unit; the gas island is a space for storing fluid formed under the action of a gas island valve in the first pressurizing unit, a first check valve in the first pressurizing unit and a second check valve in the first pressurizing unit;
and step four, utilizing the air island in the step three to pressurize the next tank car.
Compared with the prior art, the invention has the following advantages:
1. the invention provides an ultra-low temperature liquid pressurization gas island unloading device which comprises a pressurization gas island unit consisting of a pressurizer, a pressurizer fluid inlet pipeline, a pressurizer fluid outlet pipeline, a tank car liquid phase interface and a tank car gas phase interface.
2. The invention provides an ultra-low temperature liquid pressurization gas island unloading device which comprises a liquid phase branch, wherein a pressurization gas island unit and the liquid phase branch are used together to realize pressurization of a two-way tank car, and the purpose of quickly achieving pressure required by unloading of the tank car is further realized.
3. The invention provides a method for unloading by adopting an ultralow-temperature liquid pressurization gas island unloading device, which can realize double-path pressurization of a tank car by combining a pressurization gas island unit and a liquid phase branch, and can further save the unloading time by taking away the heat in an unloading pump through the fluid flow between a fluid inlet pipeline of a pressurizer connected with a liquid phase interface of the tank car, the pressurizer, an unloading liquid phase main pipe connected with the unloading liquid interface of the tank car and the liquid phase branch connected with the unloading liquid phase main pipe, reducing the temperature of the unloading pump and precooling the unloading pump.
4. The invention provides an ultralow-temperature liquid pressurization mutual-backup unloading device which comprises a pressurization mutual-backup unit consisting of a first pressurizer, a second pressurizer, a first pressurizer fluid inlet pipeline, a first pressurizer fluid outlet pipeline, a first pressurizer pipeline, a second pressurizer pipeline, a pressurization mutual-backup switching valve, a tank car liquid interface and a tank car gas interface, wherein the pressurizers can be shared or switched, the requirement of quickly replacing the pressurizers to be maintained and treated is met, and quick unloading is realized.
5. Preferably, the ultralow-temperature liquid pressurization mutual-backup unloading device also comprises a liquid phase branch which is matched with the pressurization mutual-backup unit to form a multi-path pressurization system, so that the pressure required by unloading of the tank car can be further quickly achieved.
6. Preferably, the ultralow-temperature liquid pressurization mutual-backup unloading device comprises an air island valve and a first check valve, an air island formed by a closed space in a mutual-backup pipeline of a shared supercharger and a supercharger is used for pressurizing the tank car, the precooling of an unloading pump can be further realized, the pressurization speed of the tank car is increased, the precooling speed of the unloading pump is further increased, the quick unloading is realized, the pressurization pressure of the tank car by the air island can be increased by using the single supercharger, the pressure required by the unloading of the tank car is further quickly reached, and the unloading time of the tank car is shortened.
7. The invention provides a multi-unit supercharging mutual-backup gas island unloading device which comprises a plurality of supercharging units, a first booster pipeline and a second booster pipeline, wherein the first booster pipeline and the second booster pipeline are arranged among the supercharging units, liquid unloading of tank cars can be independently carried out in each supercharging unit, a gas island is formed, and liquid unloading time for unloading liquid simultaneously from a plurality of tank cars can be reduced by selecting or combining different gas islands, so that the efficiency is higher, and unloading is faster.
The technical solution of the present invention is further described in detail with reference to the accompanying drawings and embodiments.
Drawings
FIG. 1 is a schematic structural diagram of the present invention.
Fig. 2 is an enlarged view of a portion of fig. 1A.
FIG. 3 is a schematic structural view of an ultra-low temperature liquid pressurizing mutual backup unloading device;
FIG. 4 is a schematic diagram showing the positions of gas islands in step five in example 1 and in example 3;
FIG. 5 is a schematic view of the air island when the first supercharger is deactivated and the second supercharger is switched to in embodiment 2;
fig. 6 is a schematic view of the air island in the case where the first supercharger and the second supercharger are used in common in embodiment 2.
Description of the reference numerals
1, tank car; 101-tank car liquid phase interface;
102-tank car gas phase interface; 103-liquid discharging interface of tank car;
2-unloading the liquid phase main pipe; 3-unloading pump; 4-liquid phase branch circuit;
5-liquid phase branch valve; 6-a second check valve; 7-booster fluid inlet line valve;
8-a first check valve; 9-liquid phase outlet line; 10-gas phase line;
11-gas phase valve; 12-supercharger inlet line; 13-a supercharger;
14-gas phase manifold; 15-a booster fluid outlet line; 16-gas island valve;
17-unloading crane tube gas phase arm; 18-crane tube gas phase arm valve;
19-booster backup pipeline valve; 20, a storage tank; 21-liquid phase header pipe;
22-a pressure boosting mutual backup switching valve; 23-liquid phase arm of unloading crane pipe;
131-a first line of a supercharger;
132-booster second line; 2207-first booster fluid inlet line valve;
2209 — a first liquid phase outlet line; 2210-a first gas phase line;
2211 — first gas phase valve; 2213 — first supercharger; 22132 — second supercharger;
2212 — first booster inlet line; 2215 — first booster fluid outlet line;
22122 — second booster fluid inlet line; 22152-second booster fluid outlet line.
Detailed Description
Example 1
As shown in fig. 1-2, the present embodiment provides an ultra-low temperature liquid pressurized air island unloading device, which includes a storage tank 20, and further includes a pressurized air island unit, where the pressurized air island unit includes a pressurizer 13, a pressurizer fluid inlet pipeline, a pressurizer fluid outlet pipeline 15, and a tank car liquid phase interface 101 and a tank car gas phase interface 102, which are respectively connected to a tank car 1 filled with ultra-low temperature liquid to be unloaded;
the tank car liquid phase interface 101 is arranged on a supercharger fluid inlet pipeline, and one end of the supercharger fluid inlet pipeline, which is far away from the tank car liquid phase interface 101, is communicated with an inlet of the supercharger 13;
the tank car gas phase interface 102 is arranged on a supercharger fluid outlet pipeline 15, and one end of the supercharger fluid outlet pipeline 15, which is far away from the tank car gas phase interface 102, is communicated with an outlet of the supercharger 13;
a first check valve 8 is arranged on the fluid inlet pipeline of the supercharger;
a gas island valve 16 and an unloading arm 17 are arranged on the fluid outlet pipeline 15 of the supercharger, the gas island valve 16 is close to the outlet of the supercharger 13, and the unloading arm 17 is close to the tank car gas phase interface 102;
and a loading arm gas phase arm valve 18 is arranged on the unloading loading arm gas phase arm 17.
The air island valve is used for controlling the flow rate of fluid in a fluid outlet pipeline of the supercharger, is a common valve in the field, and is not limited in structure as long as the functions can be realized.
The first check valve is used for preventing fluid in a fluid inlet pipeline of the supercharger from flowing backwards, is a common check valve in the field, is not limited in structure, and can realize the functions.
The pressurization gas island unit is arranged to unload the ultralow-temperature liquid in the tank car filled with the ultralow-temperature liquid to be unloaded, so that the fluid pressure between the pressurization gas island unit and the first check valve and the fluid pressure between the pressurization gas island unit and the first check valve can be fully utilized, the pressure required by unloading the tank car can be quickly reached, the unloading time can be saved, and the energy conservation and consumption reduction can be realized.
In the embodiment, the device further comprises an unloading liquid phase main pipe 2, wherein one end of the unloading liquid phase main pipe 2 is provided with a tank car liquid discharging interface 103 used for being communicated with a tank car liquid discharging port, and one end, far away from the tank car liquid discharging interface 103, of the unloading liquid phase main pipe 2 is communicated with the storage tank 20;
the unloading oil filling riser liquid phase arm 23 and the unloading pump 3 are arranged on the unloading liquid phase main pipe 2; the position of the unloading pump 3 on the unloading liquid phase main pipe 2 is positioned between the unloading arm 23 and the storage tank 20;
the unloading main liquid phase pipe 2 is connected with a liquid phase branch 4, the connection point of the liquid phase branch 4 on the unloading main liquid phase pipe 2 is positioned between the unloading pump 3 and the storage tank 20, and one end of the liquid phase branch 4, which is far away from the unloading main liquid phase pipe 2, is communicated with the fluid inlet pipeline of the supercharger;
the liquid phase branch 4 is provided with a second check valve 6 and a liquid phase branch valve 5, and the position of the second check valve 6 on the liquid phase branch 4 is positioned between the liquid phase branch 4 and the liquid phase branch valve 5 and the connection point of the supercharger fluid inlet pipeline;
a supercharger fluid inlet line valve 7 is arranged on the supercharger fluid inlet line.
The liquid phase branch valve is used for controlling the flow rate of fluid in the liquid phase branch, and the liquid phase branch valve is a common valve in the field, and the structure of the liquid phase branch valve is not limited as long as the functions can be realized.
The fluid inlet pipeline valve of the pressure booster is used for controlling the flow of fluid in the liquid phase outlet pipeline, is a common valve in the field, and has no limitation on structure as long as the functions are realized.
The second check valve is used for preventing the backflow of fluid in the liquid phase branch, is a common check valve in the field, is not limited in structure, and can realize the functions.
Furthermore, in the embodiment, the pressurization gas island unit and the liquid phase branch are combined to realize pressurization of the two-way tank car, the purpose of quickly achieving pressure required by unloading of the tank car is further realized through the fluid pressure in the pipeline enclosed among the first check valve, the second check valve and the gas island valve, precooling of an unloading pump can be realized on the basis of pressurization of the two-way tank car, and the whole unloading time is further reduced.
Furthermore, the position of the liquid phase branch valve 5 on the liquid phase branch 4 is positioned between the connection point of the liquid phase branch 4 and the unloading liquid phase main pipe 2 and the second check valve 6. When the unloading pump precools to-120 ℃, the tank wagon is pressurized by the fluid flowing into the tank wagon, so that the ultralow-temperature liquid flows into the storage tank under the action of the unloading pump and the liquid phase pressurization, and unloading is realized.
In the embodiment, the supercharger fluid inlet pipeline comprises a supercharger inlet pipeline 12 and a liquid phase outlet pipeline 9, wherein one ends of the supercharger inlet pipeline and the liquid phase outlet pipeline are communicated;
the tank car liquid phase interface 101 is arranged at one end of the liquid phase outlet pipeline 9 far away from the supercharger inlet pipeline 12, and one end of the supercharger inlet pipeline 12 far away from the liquid phase outlet pipeline 9 is connected to the inlet of the supercharger 13;
the first check valve 8 and the supercharger fluid inlet pipeline valve 7 are both arranged on the liquid phase outlet pipeline 9, and the supercharger fluid inlet pipeline valve 7 is positioned between the tank car liquid phase interface 101 and the first check valve 8 on the liquid phase outlet pipeline 9. The fluid inlet pipeline of the supercharger comprises a supercharger inlet pipeline and a liquid phase outlet pipeline, one end of the supercharger inlet pipeline is communicated with the liquid phase outlet pipeline, and the supercharger inlet pipeline and the liquid phase outlet pipeline are connected through two different pipelines, so that different pipelines can be respectively matched with the tank car and the supercharger interface.
In the embodiment, the device further comprises a gas phase pipeline 10, wherein one end of the gas phase pipeline 10 is connected to a fluid outlet pipeline 15 of the pressure booster, the connection point is positioned between a gas phase arm 17 of the unloading arm and a gas island valve 16, and the other end of the gas phase pipeline 10 is communicated with a storage tank 20;
the gas phase pipeline 10 is provided with a gas phase valve 11. The gas phase valve is used for controlling the flow rate of fluid in the gas phase pipeline, is a common valve in the field, and is not limited in structure as long as the functions can be realized. The gas phase line serves to equalize the pressure between the storage tank and the tanker. A storage tank gas phase opening is formed in the storage tank 20, a gas phase header 14 is connected to the storage tank gas phase opening, and the gas phase pipeline 10 is communicated with the storage tank 20 through the gas phase header 14;
in this embodiment, there are a plurality of the pressurized gas island units, and a first booster pipeline 131 and a second booster pipeline 132 are disposed between the plurality of pressurized gas island units; the supercharger first line 131 and the supercharger second line 132 are connected between the plurality of superchargers for switching and sharing of the superchargers;
the first booster line 131 communicates with each of the fluid inlet booster lines, each of the fluid inlet booster lines being provided with a mutual boost switching valve 22, the mutual boost switching valve 22 being located at a position on the corresponding fluid inlet booster line between a connection point of the first booster line 131 with the corresponding fluid inlet booster line and an inlet of the corresponding booster 13;
the booster second lines 132 communicate with each booster fluid outlet line 15, the connection point of each booster second line 132 on the respective booster fluid outlet line 15 being located between the outlet of the respective booster 13 and the respective air island valve 16.
Further, a booster backup line valve 19 is disposed on the booster second line 132. When the vehicle is not unloaded for a long time or the pressure in the air island is overhigh, the pressure booster is provided with a pipeline valve for releasing the pressure in the pipeline.
The method for unloading by adopting the ultralow-temperature liquid pressurized gas island unloading device comprises the following steps:
step one, pipeline installation: respectively communicating a tank car liquid phase interface 101, a tank car gas phase interface 102 and a tank car liquid discharging interface 103 with corresponding openings of a tank car 1 filled with ultralow-temperature liquid to be discharged;
step two, preparation before unloading: when the pressure in the tank wagon 1 is more than or equal to the pressure in the storage tank 20, the next operation can be directly carried out,
when the pressure in the tank car 1 is less than the pressure in the storage tank 20, opening the oil filling riser gas phase arm valve 18 and the gas phase valve 11 to enable the storage tank 20 to be communicated with the tank car 1 so as to balance the pressure in the storage tank 20 and the tank car 1, and when the pressure in the tank car 1 is equal to the pressure in the storage tank 20, closing the gas phase valve 11 to cut off the fluid in the gas phase pipeline 10 and the gas phase header 14, and performing the next step;
step three, pre-cooling by a self-pressurization and unloading pump 3: opening the liquid phase branch valve 5, the booster fluid inlet pipeline valve 7 and the gas island valve 16, maintaining the opening of the oil filling riser gas phase arm valve 18, opening the booster 13, and not opening the unloading pump 3;
liquid fluid in the tank wagon 1 is divided into two paths, wherein one path flows into the supercharger 13 from a tank wagon liquid phase interface 101 through a supercharger fluid inlet pipeline, and flows back to the tank wagon 1 through a supercharger fluid outlet pipeline 15, an unloading crane pipe gas phase arm 17 and a tank wagon gas phase interface 102;
the other path of liquid fluid in the tank wagon 1 enters the unloading liquid phase main pipe 2 from the tank wagon unloading interface 103, flows through the unloading pump 3 to pre-cool the unloading pump 3, flows out of the unloading pump 3 and then flows into the supercharger 13 from the liquid phase branch 4, and flows back to the tank wagon 1 through the supercharger fluid outlet pipeline 15, the unloading arm gas phase arm 17 and the tank wagon gas phase interface 102 until the temperature displayed by the unopened unloading pump 3 is less than or equal to-120 ℃, so that the pre-cooling of the unloading pump 3 is completed;
step four, unloading: closing a fluid inlet pipeline valve 7 of the pressurizer, maintaining a liquid phase branch valve 5, an air island valve 16 and a loading arm gas phase arm valve 18 to be opened, starting the unloading pump 3, enabling liquid in the tank car 1 to enter the unloading liquid phase main pipe 2 from a tank car unloading interface 103, flowing through the unloading pump 3 on the unloading liquid phase main pipe 2 and then being divided into two branches, enabling fluid in one branch to flow into the pressurizer 13 from the liquid phase branch 4, flowing back to the tank car 1 through a tank car gas phase interface 102 through a fluid outlet pipeline 15 of the pressurizer and an unloading arm gas phase arm 17 of the unloading arm to be pressurized, and enabling the fluid in the other branch to continuously flow into the storage tank 20 along the unloading liquid phase main pipe 2 through a liquid phase main header 21 under the combined action of the pressurization and the unloading;
step five, forming a gas island: after unloading, the liquid phase branch valve 5 and the gas island valve 16 are closed, the booster fluid inlet pipeline valve 7 and the gas phase valve 11 are kept closed, the oil filling riser gas phase arm valve 18 is closed, nitrogen is filled into a pipeline between the oil filling riser gas phase arm valve 18 and the tank car gas phase interface 102 by utilizing an emptying valve on an unloading oil filling riser gas phase arm 17 to empty the fluid in the pipeline, an air island is formed under the action of the air island valve 16, the first check valve 8 and the second check valve 6, the air island is a space for storing fluid formed under the action of the air island valve 16, the first check valve 8 and the second check valve 6, the gas island is shown in fig. 4, and comprises a closed section of a pressurizer fluid outlet pipeline 15, a pressurizer 13, a closed section of a pressurizer fluid inlet pipeline and a closed section of a liquid phase branch 4, the closed section of the pressurizer fluid outlet pipeline 15 is from the outlet of the pressurizer 13 to an air island valve 16; the closed section of the fluid inlet pipeline of the supercharger is from the inlet of the supercharger 13 to the first check valve 8; the closed section of the liquid phase branch 4 is from the joint of the liquid phase branch 4 and a fluid inlet pipeline of the supercharger to the second check valve 6;
step six, pressurizing the second tank car and pre-cooling the unloading pump: after the second tank wagon is subjected to the operations of the first step and the second step, a liquid phase branch valve 5, a pressurizer fluid inlet pipeline valve 7, an air island valve 16 and a loading arm gas phase arm valve 18 are opened, a pressurizer 13 is started, in the fifth step, fluid in an air island, fluid which enters the pressurizer 13 from the second tank wagon through a liquid phase outlet pipeline 9 and is pressurized, and fluid which enters the pressurizer 13 from the second tank wagon through a liquid phase branch 4 and is pressurized jointly enter the second tank wagon, the second tank wagon flows into the unloading pump 3 to pre-cool the unloading pump 3, and when the temperature of the fluid in the unloading pump is monitored to be less than or equal to-120 ℃, the pressurizer fluid inlet pipeline valve 7 is closed; when the second tank car is pressurized, the fluid in the air island can be preferentially utilized, so that the quick precooling of the unloading pump is realized; if the time interval between the second tank car and the first tank car is short, or the temperature of the fluid in the unloading pump is less than or equal to-120 ℃, the pressure in the gas island can be directly utilized to pressurize and unload the tank car without precooling the unloading pump of the second tank car and form the gas island, and the operations are repeated to unload the next tank car.
The above first tank car and the second tank car are not used as the limitation of the sequence and the number of the tank cars, and the above steps can be deleted, adjusted and/or combined according to the actual production.
Example 2
As shown in fig. 3, the present embodiment provides an ultra-low temperature liquid pressurization mutual backup unloading device, which comprises a storage tank 20, and further comprises a pressurization mutual backup unit, where the pressurization mutual backup unit comprises a first pressurizer 2213, a second pressurizer 22132, a first pressurizer fluid inlet pipeline, a first pressurizer fluid outlet pipeline 2215, a second pressurizer fluid inlet pipeline 22122, a second pressurizer fluid outlet pipeline 22152, a first pressurizer pipeline 131, a second pressurizer pipeline 132, and a tank car liquid phase interface 101 and a tank car gas phase interface 102 for respectively connecting to a tank car 1 filled with ultra-low temperature liquid to be unloaded;
the tank car liquid phase interface 101 is arranged on a first pressure booster fluid inlet pipeline, and one end, far away from the tank car liquid phase interface 101, of the first pressure booster fluid inlet pipeline is communicated with an inlet of the first pressure booster 2213;
the tank car gas phase interface 102 is arranged on a first pressure booster fluid outlet pipeline 2215, and one end of the first pressure booster fluid outlet pipeline 2215 far away from the tank car gas phase interface 102 is communicated with an outlet of the first pressure booster 2213;
the first booster line 131 communicates at one end with the first booster fluid inlet line and the other end of the first booster line 131 communicates with the second booster fluid inlet line 22122;
the second booster line 132 communicates at one end with a first booster fluid outlet line 2215 and the other end of the second booster line 132 communicates with a second booster fluid outlet line 22152;
the first and second booster fluid inlet lines 22122 are respectively provided with a booster mutual-backup switching valve 22. The connection point of the booster bypass switching valve 22 on the respective booster fluid inlet line is located between the connection point of the booster first line 131 on the respective booster fluid inlet line and the inlet of the respective booster. The embodiment provides an ultralow temperature liquid pressure boost is equipped with each other and is unloaded device, include by first booster, second booster, first booster fluid inlet pipeline, first booster fluid outlet pipeline, the first pipeline of booster, booster second pipeline, the pressure boost is equipped with each other the diverter valve, the cell-car liquid phase interface and the cell-car gas phase interface each other and is equipped with the unit, realize sharing or switching booster, can satisfy the requirement that the reserve booster of quick replacement needs in booster maintenance processing, realize unloading fast.
The mutual backup means mutual backup, and particularly, in the invention, different superchargers are mutually backup.
In the embodiment, the device further comprises an unloading liquid phase main pipe 2, wherein one end of the unloading liquid phase main pipe 2 is provided with a tank car liquid discharging interface 103 used for being communicated with a tank car liquid discharging port, and one end, far away from the tank car liquid discharging interface 103, of the unloading liquid phase main pipe 2 is communicated with the storage tank 20;
the unloading oil filling riser liquid phase arm 23 and the unloading pump 3 are arranged on the unloading liquid phase main pipe 2;
the unloading main liquid phase pipe 2 is connected with a liquid phase branch 4, the connection point of the liquid phase branch 4 on the unloading main liquid phase pipe 2 is positioned between the unloading pump 3 and the storage tank 20, and one end of the liquid phase branch 4, which is far away from the unloading main liquid phase pipe 2, is communicated with the first booster fluid inlet pipeline;
the liquid phase branch 4 is provided with a second check valve 6;
the connection point of the booster first line 131 on the first booster fluid inlet line is located between the connection point of the liquidus branch 4 and the first booster fluid inlet line and the inlet of the first booster 2213. The ultralow-temperature liquid pressurization mutual-backup unloading device further comprises a liquid phase branch, a multi-path pressurization system is formed, and pressure required by unloading of the tank car can be further and quickly achieved.
The ultralow-temperature liquid pressurization mutual-backup unloading device further comprises an air island valve and a first check valve, an air island formed by closed fluid in a shared pressurizer and a pressurizer mutual-backup pipeline is utilized, higher air island pressure is achieved, pressure required by unloading of the tank car can be further rapidly achieved, and unloading time of the tank car is shortened.
Further, in this embodiment, a liquid phase branch valve 5 is disposed on the liquid phase branch 4, and the position of the liquid phase branch valve 5 on the liquid phase branch 4 is located between a connection point of the liquid phase branch 4 and the unloading liquid phase main pipe 2 and the second check valve 6.
Further, in this embodiment, the first pressurizer fluid outlet line 2215 is provided with an unloading arm gas phase arm 17 and an air island valve 16, the air island valve 16 is located on the first pressurizer fluid outlet line 2215 and close to the outlet of the first pressurizer 2213, and the unloading arm gas phase arm 17 is located on the first pressurizer fluid outlet line 2215 and close to the tank car gas phase interface 102;
a loading arm gas phase arm valve 18 is arranged on the unloading loading arm gas phase arm 17;
the connection point of the booster second line 132 to the first booster fluid outlet line 2215 is located between the air island valve 16 and the outlet of the first booster 2213;
a first check valve 8 is arranged on the first supercharger fluid inlet pipeline.
Further, in this embodiment, the second booster line 132 is provided with a booster backup line valve 19. When the vehicle is not unloaded for a long time or the pressure in the air island is overhigh, the pressure booster is provided with a pipeline valve for releasing the pressure in the pipeline.
Further, in this embodiment, the first pressure booster fluid inlet line includes a first pressure booster inlet line 2212 and a first liquid phase outlet line 2209 which are communicated at one end,
the tank car liquid phase interface 101 is installed at one end, away from the first pressure booster inlet pipeline 2212, of the first liquid phase outlet pipeline 2209, and one end, away from the first liquid phase outlet pipeline 2209, of the first pressure booster inlet pipeline 2212 is connected to an inlet of the first pressure booster 2213;
a first booster fluid inlet pipeline valve 2207 is arranged on the first liquid phase outlet pipeline 2209, and the position of the first booster fluid inlet pipeline valve 2207 on the first liquid phase outlet pipeline 2209 is positioned between the liquid phase interface 101 of the tank car and the first check valve 8.
Further, in this embodiment, a first gas line 2210 is further included, one end of the first gas line 2210 being connected to the first booster fluid outlet line 2215 at a connection point between the unloading arm gas arm 17 and the air island valve 16, the other end of the first gas line 2210 being in communication with the storage tank 20; a storage tank gas phase opening is formed in the storage tank 20, a gas phase header 14 is connected to the storage tank gas phase opening, and the first gas phase pipeline 2210 is communicated with the storage tank 20 through the gas phase header 14;
a first gas phase valve 2211 is arranged on the first gas phase pipeline 2210.
The method for carrying out ultralow-temperature liquid pressurization mutual-backup unloading by adopting the device of the embodiment comprises the steps of carrying out self-pressurization and precooling of an unloading pump, unloading and formation of an air island and pressurization on a tank car by replacing a supercharger or sharing the supercharger, and specifically comprises the following steps:
step one, pipeline installation: respectively communicating a tank car liquid phase interface 101, a tank car gas phase interface 102 and a tank car liquid discharging interface 103 with corresponding openings of a tank car 1 filled with ultralow-temperature liquid to be discharged;
step two, preparation before unloading: when the pressure in the tank wagon 1 is more than or equal to the pressure in the storage tank 20, the next operation can be directly carried out,
when the pressure in the tank wagon 1 is less than the pressure in the storage tank 20, opening the loading arm valve 18 and the first gas phase valve 2211 to enable the storage tank 20 to be communicated with the tank wagon 1 so as to balance the pressures in the storage tank 20 and the tank wagon 1, and when the pressure in the tank wagon 1 is equal to the pressure in the storage tank 20, closing the first gas phase valve 2211 to perform the next step;
step three, self-pressurization and pre-cooling of an unloading pump: the liquid phase branch valve 5, the first booster fluid inlet pipeline valve 2207 and the gas island valve 16 are opened, the loading arm gas phase arm valve 18 is kept open, the unloading pump 3 is not opened,
when it is desired to deactivate the first booster 2213 and switch to the second booster 22132: closing the first pressurizer 2213, opening the second pressurizer 22132, closing the pressurization mutual backup switching valve 22 at the first pressurizer 2213, opening the pressurization mutual backup switching valve at the second pressurizer 22132, and allowing the fluid to flow into the second pressurizer 22132 through the first pressurizer pipeline 131 and flow into the tank wagon 1 for pressurization through the second pressurizer pipeline 132;
when it is desired to share the first and second boosters 2213 and 22132: the first pressurizer 2213 and the second pressurizer 22132 are started, the pressurization mutual backup switching valve 22 at the first pressurizer 2213 and the pressurization mutual backup switching valve at the second pressurizer 22132 are started, the flow is regulated through the corresponding pressurization mutual backup switching valves, and after the fluid flows into the first pressurizer 2213 and the second pressurizer 22132 respectively, the fluid flows into the tank wagon 1 for pressurization; in the same principle, when the first supercharger 2213, the second supercharger 22132 and other superchargers need to be used simultaneously, the plurality of superchargers and corresponding supercharging mutual backup switching valves are opened simultaneously, and the flow rate is adjusted through the corresponding supercharging mutual backup switching valves;
after the fluid in the tank car 1 is pressurized, the fluid enters the unloading liquid phase main pipe 2 from the tank car unloading interface 103, flows through the unloading pump 3 to pre-cool the unloading pump 3, and when the temperature displayed by the unloading pump 3 which is not started is less than or equal to minus 120 ℃, the pre-cooling of the unloading pump 3 is completed;
step four, unloading: closing a first booster fluid inlet pipeline valve 2207, keeping a liquid phase branch valve 5, an air island valve 16 and a loading arm gas phase arm valve 18 open, starting the unloading pump 3, enabling liquid in the tank car 1 to enter the unloading liquid phase main pipe 2 from the tank car liquid unloading interface 103, flowing through the unloading pump 3 on the unloading liquid phase main pipe 2 and then being divided into two branches,
when the first booster 2213 is deactivated and switched to the second booster 22132, the boosting mutual backup switching valve 22 at the first booster 2213 is kept closed, the boosting mutual backup switching valve at the second booster 22132 and the second booster 22132 is opened, fluid in one branch flows into the tank car 1 through the first booster pipeline 131, the second booster 22132 and the second booster pipeline 132 for boosting, and under the combined action of the boosting and unloading pump 3, fluid in the other branch continuously flows into the storage tank 20 along the unloading liquid main pipe 2;
when the first supercharger 2213 and the second supercharger 22132 are shared, the first supercharger 2213 and the second supercharger 22132 are opened, the supercharging mutual backup switching valve 22 at the first supercharger 2213 and the supercharging mutual backup switching valve at the second supercharger 22132 are kept opened, fluid in one branch flows through the liquid phase branch 4 and then is divided into two paths, one path flows into the tank wagon 1 at the first supercharger 2213 through the first supercharger 2213 for supercharging, the other path flows into the tank wagon 1 through the first pipeline 131 of the supercharger, the second supercharger 22132 and the second pipeline 132 of the supercharger for supercharging, and under the combined action of the two paths of fluid supercharging and the unloading pump 3, fluid in the other branch continuously flows into the storage tank 20 along the unloading liquid phase main pipe 2 for unloading.
Preferably, the method of this embodiment may further pressurize the next tank car by forming the gas island, and the process of forming the gas island specifically includes:
after unloading is finished, the liquid phase branch valve 5 and the gas island valve 16 are closed, the first booster fluid inlet pipeline valve 2207 and the first gas phase valve 2211 are kept closed, a gas island is formed under the action of the gas island valve 16, the first check valve 8 and the second check valve 6,
when the first booster 2213 is deactivated and switched to the second booster 22132, the gas island is as shown in fig. 5, the gas island includes a first booster fluid outlet line 2215 closed section, a second booster 22132, a first booster fluid inlet line closed section, a liquid phase branch 4 closed section, a second booster fluid inlet line 22122 closed section, a second booster fluid outlet line 22152 closed section, a booster first line 131 and a booster second line 132; the closed section of the first booster fluid outlet line 2215 is from the connection point of the first booster fluid outlet line 2215 and the first booster 2213 to the air island valve 16; the first supercharger fluid inlet pipeline closing section is from the connection point of the first supercharger fluid inlet pipeline and the first pipeline 131 of the supercharger to the first check valve 8; the closed section of the liquid phase branch 4 is from the connection part of the liquid phase branch 4 and the fluid inlet pipeline of the first supercharger to the second check valve 6; the closed section of the second booster fluid outlet line 22152 is from the second booster outlet to the connection point of the second booster fluid outlet line 22152 with the booster second line 132; the second booster fluid inlet line 22122 is closed from the connection point of the second booster fluid inlet line 22122 with the booster first line 131 to the second booster inlet;
when the first and second pressurizers 2213 and 22132 are shared, the gas island is as shown in fig. 6, and the gas island comprises a first pressurizer fluid outlet line 2215 closed section, a first pressurizer 2213, a second pressurizer 22132, a second pressurizer fluid inlet line 22122 closed section, a first pressurizer fluid inlet line closed section, a liquid phase branch 4 closed section, a second pressurizer fluid outlet line 22152 closed section, a first pressurizer line 131 and a second pressurizer line 132; the closed section of the first booster fluid outlet line 2215 is from the outlet of the first booster 2213 to the air island valve 16; the first pressurizer fluid inlet pipeline closing section is from the inlet of the first pressurizer 2213 to the first check valve 8; the closed section of the liquid phase branch 4 is from the connection part of the liquid phase branch 4 and the fluid inlet pipeline of the first supercharger to the second check valve 6; the closed section of the second booster fluid outlet line 22152 is from the second booster outlet to the connection point of the second booster fluid outlet line 22152 with the booster second line 132; the second booster fluid inlet line 22122 is closed from the connection point of the second booster fluid inlet line 22122 with the booster first line 131 to the second booster inlet;
example 3
As shown in fig. 1 to 2, the present embodiment provides a multi-unit pressurization mutual backup air island unloading device, which includes a storage tank 20, a plurality of pressurization units, and a first pipeline 131 and a second pipeline 132 of a pressurizer disposed between the plurality of pressurization units;
each pressurizing unit comprises a pressurizing air island unit and a pressurizing liquid unit;
each pressurizing gas island unit comprises a pressurizer 13, a pressurizer fluid inlet pipeline, a pressurizer fluid outlet pipeline 15, and a tank car liquid phase interface 101 and a tank car gas phase interface 102 which are respectively connected with a tank car 1 filled with ultra-low temperature liquid to be unloaded;
each tank car liquid phase interface 101 is arranged on a corresponding supercharger fluid inlet pipeline, and one end, far away from the corresponding tank car liquid phase interface 101, of the supercharger fluid inlet pipeline is communicated with the inlet of a corresponding supercharger 13;
each tank car gas phase interface 102 is arranged on a corresponding pressure booster fluid outlet pipeline 15, and one end, far away from the corresponding tank car gas phase interface 102, of the pressure booster fluid outlet pipeline 15 is communicated with the outlet of a corresponding pressure booster 13;
a first check valve 8 is arranged on each supercharger fluid inlet pipeline;
each pressurizer fluid outlet pipeline is provided with a gas island valve 16 and an unloading arm 17, the gas island valve 16 is close to the outlet of the corresponding pressurizer 13, and the unloading arm 17 is close to the corresponding tank car gas phase interface 102;
a crane pipe gas phase arm valve 18 is arranged on each crane pipe gas phase arm 17;
each liquid pressurization unit comprises an unloading liquid phase main pipe 2, one end of each unloading liquid phase main pipe 2 is provided with a tank car liquid unloading interface 103 used for being communicated with a tank car liquid unloading opening, and one end, far away from the tank car liquid unloading interface 103, of each unloading liquid phase main pipe 2 is communicated with the storage tank 20; further, a storage tank liquid phase opening is formed in the storage tank 20, a liquid phase header 21 is connected to the storage tank liquid phase opening, and each unloading liquid phase main pipe 2 is communicated with the storage tank 20 through the liquid phase header 21;
each unloading main liquid phase pipe 2 is provided with an unloading crane pipe liquid phase arm 23 and an unloading pump 3, and further, the position of each unloading pump 3 on the corresponding unloading main liquid phase pipe 2 is positioned between the corresponding unloading crane pipe liquid phase arm 23 and the storage tank 20;
each unloading liquid phase main pipe 2 is connected with a liquid phase branch 4, the connection point of each liquid phase branch 4 on the corresponding unloading liquid phase main pipe 2 is positioned between the corresponding unloading pump 3 and the storage tank 20, and one end of each liquid phase branch 4, which is far away from the corresponding unloading liquid phase main pipe 2, is communicated with the corresponding fluid inlet pipeline of the supercharger;
each liquid phase branch 4 is provided with a second check valve 6;
the booster first line 131 communicates with each of the booster fluid inlet lines, the connection point of the booster first line 131 on each booster fluid inlet line being located between the connection point of the respective liquid phase branch 4 with the respective booster fluid inlet line and the inlet of the respective booster 13;
the booster second line 132 communicates with each booster fluid outlet line 15, the connection point of the booster second line 132 on each booster fluid outlet line 15 being located between the respective air island valve 16 and the outlet of the respective booster 13; further, a booster backup line valve 19 is disposed on the booster second line 132, and the booster backup line valve 19 is plural. When the vehicle is not unloaded for a long time or the pressure in the air island is overhigh, the pressure booster is provided with a pipeline valve for releasing the pressure in the air island.
Each of the supercharger fluid inlet lines is provided with a mutual boost switching valve 22, the position of each of said mutual boost switching valves 22 on the respective supercharger fluid inlet line being located between the connection point of the supercharger first line 131 on the respective supercharger fluid inlet line and the inlet of the respective supercharger 13.
Further, in this embodiment, each liquid phase branch 4 is provided with a liquid phase branch valve 5, and the position of each liquid phase branch valve 5 on the corresponding liquid phase branch 4 is located between the connection point of the corresponding liquid phase branch 4 and the corresponding unloading liquid phase main pipe 2 and the corresponding second check valve 6;
each supercharger fluid inlet pipeline comprises a supercharger inlet pipeline 12 and a liquid phase outlet pipeline 9, one end of each supercharger inlet pipeline 12 is communicated with one end of each liquid phase outlet pipeline 9, the liquid phase interface 101 of each tank car is installed at one end, far away from the corresponding supercharger inlet pipeline 12, of the corresponding liquid phase outlet pipeline 9, and one end, far away from the corresponding liquid phase outlet pipeline 9, of each supercharger inlet pipeline 12 is connected to the inlet of the corresponding supercharger 13;
each first check valve 8 is arranged on a corresponding liquid phase outlet pipeline 9;
each liquid phase outlet pipeline 9 is provided with a booster fluid inlet pipeline valve 7, and the position of each booster fluid inlet pipeline valve 7 on the liquid phase outlet pipeline 9 is positioned between the corresponding first check valve 8 and the corresponding liquid phase interface 101 of the tank car;
further, the device comprises gas phase pipelines 10 with the same number as the number of the pressurizing units, one end of each gas phase pipeline 10 is connected to a corresponding fluid outlet pipeline 15 of the pressurizing unit, the connection point is positioned between a corresponding unloading arm gas phase arm 17 and a corresponding gas island valve 16, and the other end of each gas phase pipeline 10 is communicated with the storage tank 20; a storage tank gas phase opening is formed in the storage tank 20, a gas phase header 14 is connected to the storage tank gas phase opening, and each gas phase pipeline 10 is communicated with the storage tank 20 through the gas phase header 14;
each of the gas phase pipelines 10 is provided with a gas phase valve 11.
The method for unloading by adopting the multi-unit pressurizing mutual-backup gas island unloading device comprises a first pressurizing unit and a second pressurizing unit, and comprises the steps of unloading corresponding tank cars, forming gas islands and unloading the Nth tank car by using the gas islands in a single pressurizing unit, and further comprises the steps of switching or sharing the pressurizers and unloading by using the switched or shared pressurizers, wherein the method for unloading corresponding tank cars, forming gas islands and unloading the Nth tank car by using the gas islands in the single pressurizing unit comprises the following steps: n is more than or equal to 2;
step one, pipeline installation: respectively communicating a tank car liquid phase interface 101, a tank car gas phase interface 102 and a tank car liquid discharging interface 103 with corresponding openings of a tank car 1 filled with ultralow-temperature liquid to be discharged;
step two, preparation before unloading: when the pressure in the tank wagon 1 is more than or equal to the pressure in the storage tank 20, the next operation can be directly carried out,
when the pressure in the tank car 1 is less than the pressure in the storage tank 20, opening the oil filling riser gas phase arm valve 18 and the gas phase valve 11 to enable the storage tank 20 to be communicated with the tank car 1 so as to balance the pressure in the storage tank 20 and the tank car 1, and when the pressure in the tank car 1 is equal to the pressure in the storage tank 20, closing the gas phase valve 11 to cut off the fluid in the gas phase pipeline 10 and the gas phase header 14, and performing the next step;
step three, pre-cooling by a self-pressurization and unloading pump 3: the liquid phase branch valve 5, the booster fluid inlet pipeline valve 7 and the air island valve 16 are opened, the oil filling riser gas phase arm valve 18 is kept open, the booster 13 is opened, the unloading pump 3 is not opened,
liquid fluid in the tank wagon 1 is divided into two paths, wherein one path flows into the supercharger 13 from a tank wagon liquid phase interface 101 through a supercharger fluid inlet pipeline, and flows back to the tank wagon 1 through a supercharger fluid outlet pipeline 15, an unloading crane pipe gas phase arm 17 and a tank wagon gas phase interface 102;
the other path of liquid fluid in the tank wagon 1 enters the unloading liquid phase main pipe 2 from the tank wagon unloading interface 103, flows through the unloading pump 3 to pre-cool the unloading pump 3, then flows into the supercharger 13 from the liquid phase branch 4, and flows back to the tank wagon 1 through the supercharger fluid outlet pipeline 15, the unloading arm gas phase arm 17 and the tank wagon gas phase interface 102, and when the temperature displayed by the unopened unloading pump 3 is less than or equal to-120 ℃, the pre-cooling of the unloading pump 3 is completed;
step four, unloading: closing a fluid inlet pipeline valve 7 of the pressurizer, maintaining a liquid phase branch valve 5, an air island valve 16 and a loading arm gas phase arm valve 18 to be opened, starting the unloading pump 3, enabling liquid in the tank car 1 to enter the unloading liquid phase main pipe 2 from a tank car unloading interface 103, flowing through the unloading pump 3 on the unloading liquid phase main pipe 2 and then being divided into two branches, enabling fluid in one branch to flow into the pressurizer 13 from the liquid phase branch 4, flowing back to the tank car 1 through a tank car gas phase interface 102 through a fluid outlet pipeline 15 of the pressurizer and an unloading arm gas phase arm 17 of the unloading arm to be pressurized, and enabling the fluid in the other branch to continuously flow into the storage tank 20 along the unloading liquid phase main pipe 2 through a liquid phase main header 21 under the combined action of the pressurization and the unloading;
step five, forming a gas island: after unloading is finished, the liquid phase branch valve 5 and the gas island valve 16 are closed, the pressurizer fluid inlet pipeline valve 7 and the gas phase valve 11 are kept closed, and a gas island is formed under the action of the gas island valve 16, the first check valve 8 and the second check valve 6, as shown in fig. 4, the gas island comprises a pressurizer fluid outlet pipeline 15 closed section, a pressurizer 13, a pressurizer fluid inlet pipeline closed section and a liquid phase branch 4 closed section, and the pressurizer fluid outlet pipeline 15 closed section is from the outlet of the pressurizer 13 to the gas island valve 16; the closed section of the fluid inlet pipeline of the supercharger is from the inlet of the supercharger 13 to the first check valve 8; the closed section of the liquid phase branch 4 is from the joint of the liquid phase branch 4 and a fluid inlet pipeline of the supercharger to the second check valve 6;
step six, pressurizing the Nth tank car and pre-cooling an unloading pump: after the operation of the first step and the second step is carried out on the Nth tank wagon, a liquid phase branch valve 5, a pressurizer fluid inlet pipeline valve 7, an air island valve 16 and a loading arm gas phase arm valve 18 are opened, a pressurizer 13 is started, in the fifth step, fluid in an air island, fluid entering the pressurizer 13 from the Nth tank wagon through a liquid phase outlet pipeline 9 and fluid entering the pressurizer 13 from the Nth tank wagon through a liquid phase branch 4 enter the Nth tank wagon together for pressurization, the fluid in the Nth tank wagon flows into the unloading pump 3 for precooling the unloading pump 3, and when the temperature of the fluid in the unloading pump is monitored to be less than or equal to-120 ℃, the pressurizer fluid inlet pipeline valve 7 is closed;
step seven, unloading the Nth tank car and forming an air island according to the operation of the step three to the step five;
and step eight, repeating the step six and the step seven, and unloading the third tank car to the Nth tank car.
The first step to the eighth step can be carried out in each pressurizing unit simultaneously or respectively, and different pressurizing units are independent from each other.
The method for switching or sharing the supercharger and unloading the vehicle by using the supercharger after switching and sharing comprises the following steps of replacing the supercharger in the first supercharging unit with the supercharger in the second supercharging unit and unloading the vehicle by using the supercharger in the second supercharging unit, or sharing the supercharger in the first supercharging unit and the supercharger in the second supercharging unit for unloading the vehicle, and comprises the following steps:
step 101 and step 102 are the same as the above step one and step two;
step 103, self-pressurization and pre-cooling of an unloading pump: opening a liquid phase branch valve in the first pressurizing unit, a fluid inlet pipeline valve of a pressurizer in the first pressurizing unit and an air island valve in the first pressurizing unit, maintaining the opening of an air arm valve of an oil filling riser in the first pressurizing unit, and closing an air island valve in the second pressurizing unit;
when the supercharger in the first supercharging unit needs to be deactivated and switched to the supercharger in the second supercharging unit: the switching valve for mutual pressurization and backup in the first pressurizing unit and the supercharger in the first pressurizing unit is closed, the switching valve for mutual pressurization and backup in the second pressurizing unit and the supercharger in the second pressurizing unit is opened, liquid fluid in the tank car is divided into two paths, one path of liquid fluid flows into the supercharger in the second pressurizing unit from the liquid phase interface of the tank car in the first pressurizing unit through the first pipeline of the supercharger, and flows into the tank car for pressurization through the second pipeline of the supercharger;
when it is desired to share the first and second superchargers in the first and second superchargers: opening a supercharger in a first supercharging unit, a supercharger in a second supercharging unit, a supercharging mutual-backup switching valve in the first supercharging unit and a supercharging mutual-backup switching valve in the second supercharging unit, adjusting the flow through the corresponding supercharging mutual-backup switching valves, and enabling the fluid to respectively flow into the supercharger in the first supercharging unit and the supercharger in the second supercharging unit and converge into a tank car for supercharging; the principle is the same, when a supercharger in a first supercharging unit, a supercharger in a second supercharging unit and superchargers in other supercharging units are required to be used at the same time, the supercharger and the corresponding supercharging mutual-backup switching valve are opened at the same time, and the flow is adjusted through the corresponding supercharging mutual-backup switching valve;
the other path of fluid of the tank wagon flows into the unloading pump in the first pressurizing unit for precooling through the unloading liquid-phase main pipe in the first pressurizing unit, flows out of the unloading pump and flows into the tank wagon through the corresponding pressurizer and the second pipeline 132 of the pressurizer, and precooling of the unloading pump is completed when the temperature of the fluid in the unloading pump in the first pressurizing unit is less than or equal to minus 120 ℃;
step 104, unloading: closing a fluid inlet pipeline valve in the first pressurizing unit, maintaining a liquid phase branch valve in the first pressurizing unit, an air island valve in the first pressurizing unit and a gas arm valve of a loading arm in the first pressurizing unit to be opened, maintaining the air island valve in the second pressurizing unit to be closed, and opening an unloading pump in the first pressurizing unit;
liquid in the tank car enters a liquid phase main pipe of the tank car in the first pressurizing unit from a tank car liquid discharging interface in the first pressurizing unit, flows through a discharge pump in the first pressurizing unit and then is divided into two branches;
when the first pressurizing unit is stopped and switched into the second pressurizing unit, the pressurizing mutual-backup switching valve and the supercharger in the first pressurizing unit are kept closed, the supercharger and the pressurizing mutual-backup switching valve in the second pressurizing unit are kept opened, the fluid in one branch flows into the tank car for pressurization from the liquid phase branch in the first pressurizing unit through the first pipeline 131 of the supercharger, the supercharger in the second pressurizing unit and the second pipeline 132 of the supercharger, and the fluid in the other branch continuously flows into the storage tank 20 along the unloading liquid phase main pipe in the first pressurizing unit under the combined action of the pressurizing and unloading pumps;
when the booster in the first pressurizing unit and the booster in the second pressurizing unit are shared, the boosting mutual backup switching valve and the booster in the first pressurizing unit and the boosting mutual backup switching valve and the booster in the second pressurizing unit are kept open, fluid in one branch is divided into two paths after flowing through the liquid phase branch in the first pressurizing unit, one path flows into the tank wagon for pressurization after flowing through the booster in the first pressurizing unit, the other path flows into the tank wagon for pressurization after flowing through the first pipeline 131 of the booster, the booster in the second pressurizing unit and the second pipeline 132 of the booster, and under the combined action of the two paths of fluid and the unloading pump in the first pressurizing unit, fluid in the other branch continuously flows into the storage tank 20 along the unloading liquid phase main pipe in the first pressurizing unit for unloading;
step 105, the process of forming the gas island specifically comprises: after unloading is finished, a liquid phase branch valve in the first pressurizing unit and an air island valve in the first pressurizing unit are closed, an air island valve in the second pressurizing unit is kept closed, a fluid inlet pipeline valve of a pressurizer in the first pressurizing unit and a gas phase valve are kept closed, an air island is formed under the action of the air island valve in the first pressurizing unit, a first check valve in the first pressurizing unit and a second check valve in the first pressurizing unit, and the air island is a space for storing fluid formed under the action of the air island valve in the first pressurizing unit, the first check valve in the first pressurizing unit and the second check valve in the first pressurizing unit;
when the supercharger in the first supercharging unit is stopped and switched to the supercharger in the second supercharging unit, the air island comprises a closed section of a fluid outlet pipeline of the supercharger in the first supercharging unit, a closed section of a fluid inlet pipeline of the supercharger in the first supercharging unit, a closed section of a liquid phase branch in the first supercharging unit, the supercharger in the second supercharging unit, a closed section of a fluid inlet pipeline of the supercharger in the second supercharging unit, a closed section of a fluid outlet pipeline of the supercharger in the second supercharging unit, a first pipeline 131 of the supercharger and a second pipeline 132 of the supercharger;
the closed section of the fluid outlet pipeline of the supercharger in the first supercharging unit is from the connection point of the fluid outlet pipeline of the supercharger in the first supercharging unit and the second pipeline 132 of the supercharger to the air island valve in the first supercharging unit;
the closed section of the fluid inlet pipeline of the supercharger in the first supercharging unit is from the connection point of the fluid inlet pipeline of the supercharger in the first supercharging unit and the first pipeline 131 of the supercharger to the first check valve in the first supercharging unit;
the closed section of the liquid phase branch in the first pressurizing unit is a second check valve from the joint of the liquid phase branch in the first pressurizing unit and a fluid inlet pipeline of a pressurizer in the first pressurizing unit to the first pressurizing unit;
the closed section of the fluid inlet pipeline of the supercharger in the second supercharging unit is from the connection point of the fluid inlet pipeline of the supercharger in the second supercharging unit and the first pipeline 131 of the supercharger to the inlet of the supercharger in the second supercharging unit;
the closed section of the fluid outlet pipeline of the pressure booster in the second pressure boosting unit is from the outlet of the pressure booster in the second pressure boosting unit to the air island valve in the second pressure boosting unit;
when the supercharger in the first supercharging unit and the supercharger in the second supercharging unit are shared, the gas island comprises a closed fluid inlet section of the supercharger in the first supercharging unit, a closed fluid outlet pipeline section of the supercharger in the first supercharging unit, a closed fluid inlet pipeline section of the supercharger in the first supercharging unit, a closed liquid phase branch in the first supercharging unit, the supercharger in the second supercharging unit, a closed fluid inlet pipeline section of the supercharger in the second supercharging unit, a closed fluid outlet pipeline section of the supercharger in the second supercharging unit, a first pipeline 131 of the supercharger and a second pipeline 132 of the supercharger;
the closed section of the fluid inlet of the supercharger in the first supercharging unit is a first check valve from the inlet of the supercharger in the first supercharging unit to the inside of the first supercharging unit;
the closed section of the fluid outlet pipeline of the supercharger in the first supercharging unit is from the outlet of the supercharger in the first supercharging unit to the air island valve in the first supercharging unit;
the closed section of the fluid inlet pipeline of the supercharger in the first supercharging unit is from the connection point of the fluid inlet pipeline of the supercharger in the first supercharging unit and the first pipeline 131 of the supercharger to the first check valve in the first supercharging unit;
the closed section of the liquid phase branch in the first pressurizing unit is a second check valve from the joint of the liquid phase branch in the first pressurizing unit and a fluid inlet pipeline of a pressurizer in the first pressurizing unit to the first pressurizing unit;
the closed section of the fluid inlet pipeline of the supercharger in the second supercharging unit is from the connection point of the fluid inlet pipeline of the supercharger in the second supercharging unit and the first pipeline 131 of the supercharger to the inlet of the supercharger in the second supercharging unit;
the closed section of the fluid outlet pipeline of the pressure booster in the second pressure boosting unit is from the outlet of the pressure booster in the second pressure boosting unit to the air island valve in the second pressure boosting unit;
step 106, pressurizing the Nth tank car and pre-cooling an unloading pump: opening an air island valve in the first pressurizing unit, a liquid phase branch valve in the first pressurizing unit, a fluid inlet pipeline valve of a pressurizer in the first pressurizing unit and a gas phase arm valve of a loading arm in the first pressurizing unit,
when the supercharger in the first supercharging unit is stopped and switched to the supercharger in the second supercharging unit, the supercharger in the second supercharging unit is started, and in step 105, the fluid in the air island and the fluid entering the supercharger in the second supercharging unit from the Nth tank wagon enter the Nth tank wagon together for supercharging; and N is more than or equal to 2.
And when the first pressure booster unit and the second pressure booster unit are shared, the pressure booster in the first pressure booster unit and the pressure booster in the second pressure booster unit are started, and in the fifth step, the fluid in the air island and the fluid entering the pressure booster in the first pressure booster unit and the pressure booster in the second pressure booster unit from the Nth tank wagon enter the Nth tank wagon together for pressure boosting.
The device can also realize the simultaneous or selective pressurization of a plurality of tank cars by regulating and controlling different pressurization mutual backup switching valves and controlling the opening and closing of different gas islands, namely, the flow is controlled by the corresponding gas island valve and the pressurization mutual backup switching valve, so that the fluid in the pipeline flows into the corresponding tank cars simultaneously.
The first tank car and the Nth tank car are not used as the limitation of the sequence and the number of the tank cars, and the steps can be deleted, adjusted and/or combined according to the actual production.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and all simple modifications, changes and equivalent structural changes made to the above embodiment according to the technical spirit of the present invention still fall within the protection scope of the technical solution of the present invention.

Claims (10)

1. An ultra-low temperature liquid pressurization gas island unloading device comprises a storage tank (20) and is characterized by further comprising a pressurization gas island unit, wherein the pressurization gas island unit comprises a pressurizer (13), a pressurizer fluid inlet pipeline, a pressurizer fluid outlet pipeline (15) and a tank car liquid phase interface (101) and a tank car gas phase interface (102) which are respectively connected with a tank car (1) filled with ultra-low temperature liquid to be unloaded;
the tank car liquid phase interface (101) is arranged on a supercharger fluid inlet pipeline, and one end, far away from the tank car liquid phase interface (101), of the supercharger fluid inlet pipeline is communicated with an inlet of the supercharger (13);
the tank car gas phase interface (102) is arranged on a supercharger fluid outlet pipeline (15), and one end, far away from the tank car gas phase interface (102), of the supercharger fluid outlet pipeline (15) is communicated with an outlet of the supercharger (13);
a first check valve (8) is arranged on the fluid inlet pipeline of the supercharger;
a gas island valve (16) and an unloading crane pipe gas phase arm (17) are arranged on the supercharger fluid outlet pipeline (15), the gas island valve (16) is close to the outlet of the supercharger (13), and the unloading crane pipe gas phase arm (17) is close to the tank car gas phase interface (102);
and a crane pipe gas phase arm valve (18) is arranged on the unloading crane pipe gas phase arm (17).
2. The ultra-low temperature liquid pressurization gas island unloading device according to claim 1, further comprising an unloading liquid phase main pipe (2), wherein one end of the unloading liquid phase main pipe (2) is provided with a tank car liquid unloading interface (103) used for communicating with a tank car liquid unloading port, and one end of the unloading liquid phase main pipe (2), which is far away from the tank car liquid unloading interface (103), is communicated with the storage tank (20);
the unloading oil filling riser liquid phase arm (23) and the unloading pump (3) are arranged on the unloading liquid phase main pipe (2);
the unloading liquid phase main pipe (2) is connected with a liquid phase branch (4), the connection point of the liquid phase branch (4) on the unloading liquid phase main pipe (2) is positioned between the unloading pump (3) and the storage tank (20), and one end, far away from the unloading liquid phase main pipe (2), of the liquid phase branch (4) is communicated with the fluid inlet pipeline of the supercharger;
the liquid phase branch (4) is provided with a second check valve (6) and a liquid phase branch valve (5), and the position of the second check valve (6) on the liquid phase branch (4) is positioned between the liquid phase branch (4) and the liquid phase branch valve (5) and the connection point of the liquid phase branch (4) and the fluid inlet pipeline of the supercharger;
and a supercharger fluid inlet pipeline valve (7) is arranged on the supercharger fluid inlet pipeline.
3. An ultra-low temperature liquid pressurized gas island unloading apparatus as claimed in claim 2, wherein the booster fluid inlet line comprises a booster inlet line (12) and a liquid phase outlet line (9) with one ends in communication;
the tank car liquid phase interface (101) is arranged at one end, far away from the supercharger inlet pipeline (12), of the liquid phase outlet pipeline (9), and one end, far away from the liquid phase outlet pipeline (9), of the supercharger inlet pipeline (12) is connected to an inlet of the supercharger (13);
first check valve (8) and booster fluid import pipeline valve (7) all set up on liquid phase outlet pipeline (9), booster fluid import pipeline valve (7) are located between tank wagon liquid phase interface (101) and first check valve (8) in the position on liquid phase outlet pipeline (9).
4. An ultra-low temperature liquid pressurization gas island unloading device according to claim 1, characterized by further comprising a gas phase pipeline (10), wherein one end of the gas phase pipeline (10) is connected to the fluid outlet pipeline (15) of the pressurization gas island and the connection point is located between the unloading arm (17) and the gas island valve (16), and the other end of the gas phase pipeline (10) is communicated with the storage tank (20);
and a gas phase valve (11) is arranged on the gas phase pipeline (10).
5. An ultra-low temperature liquid pressurized gas island unloading device according to claim 1, wherein the pressurized gas island units are multiple, and a first booster pipeline (131) and a second booster pipeline (132) are arranged between the multiple pressurized gas island units;
the first booster line (131) is communicated with each booster fluid inlet line, each booster fluid inlet line is provided with a mutual boosting and backup switching valve (22), and the position of the mutual boosting and backup switching valve (22) on the corresponding booster fluid inlet line is positioned between the connection point of the first booster line (131) and the corresponding booster fluid inlet line and the inlet of the corresponding booster (13);
the booster second line (132) communicates with each booster fluid outlet line (15), the connection point of each booster second line (132) on the respective booster fluid outlet line (15) being located between the outlet of the respective booster (13) and the respective air island valve (16).
6. A method of unloading using the ultra-low temperature liquid pressurized gas island unloading apparatus of claim 2, comprising the steps of:
step one, carrying out self-pressurization and pre-cooling of an unloading pump (3) on a tank car (1) filled with ultralow-temperature liquid to be unloaded: opening a liquid phase branch valve (5), a booster fluid inlet pipeline valve (7), a gas island valve (16) and a loading arm gas phase arm valve (18), starting a booster (13), and not starting an unloading pump (3);
liquid fluid in the tank wagon (1) is divided into two paths, one path flows into the supercharger (13) from a tank wagon liquid phase interface (101) through a supercharger fluid inlet pipeline, and flows back to the tank wagon (1) through a supercharger fluid outlet pipeline (15), an unloading crane pipe gas phase arm (17) and a tank wagon gas phase interface (102);
the other path of the liquid fluid in the tank wagon (1) enters the unloading liquid phase main pipe (2) from the tank wagon unloading interface (103), and flows through the unloading pump (3) to pre-cool the unloading pump (3), and when the temperature of the fluid in the unloading pump (3) is less than or equal to minus 120 ℃, the pre-cooling of the unloading pump (3) is completed;
step two, unloading: closing a booster fluid inlet pipeline valve (7), maintaining a liquid phase branch valve (5), an air island valve (16) and a loading arm gas phase arm valve (18) to be opened, starting an unloading pump (3), enabling liquid in a tank car (1) to enter an unloading liquid phase main pipe (2) from a tank car liquid unloading interface (103), enabling the liquid to flow through the unloading pump (3) on the unloading liquid phase main pipe (2) and then to be divided into two branches, enabling fluid in one branch to flow into a booster (13) from a liquid phase branch (4), enabling the fluid to flow back to the tank car (1) through a tank car gas phase interface (102) through a booster fluid outlet pipeline (15) and an unloading loading arm gas phase arm (17) for boosting, and enabling the fluid in the other branch to flow into a storage tank (20) along the unloading liquid phase main pipe (2) under the combined action of the boosting and unloading pump (3);
step three, forming a gas island: after unloading is finished, the liquid phase branch valve (5) and the gas island valve (16) are closed, the booster fluid inlet pipeline valve (7) is kept closed, a gas island is formed under the action of the gas island valve (16), the first check valve (8) and the second check valve (6), and the gas island is a space for storing fluid formed under the action of the gas island valve (16), the first check valve (8) and the second check valve (6).
7. An ultralow-temperature liquid pressurization mutual-backup unloading device comprises a storage tank (20) and is characterized by further comprising a pressurization mutual-backup unit, wherein the pressurization mutual-backup unit comprises a first pressurizer (2213), a second pressurizer (22132), a first pressurizer fluid inlet pipeline, a first pressurizer fluid outlet pipeline (2215), a second pressurizer fluid inlet pipeline (22122), a second pressurizer fluid outlet pipeline (22152), a first pressurizer pipeline (131), a second pressurizer pipeline (132) and a tank car liquid-phase interface (101) and a tank car gas-phase interface (102) which are respectively connected with a tank car (1) filled with ultralow-temperature liquid to be unloaded;
the tank car liquid phase interface (101) is arranged on the first supercharger fluid inlet pipeline, and one end, far away from the tank car liquid phase interface (101), of the first supercharger fluid inlet pipeline is communicated with an inlet of the first supercharger (2213);
the tank car gas phase interface (102) is arranged on a first pressure booster fluid outlet pipeline (2215), and one end of the first pressure booster fluid outlet pipeline (2215) far away from the tank car gas phase interface (102) is communicated with an outlet of the first pressure booster (2213);
the first booster line (131) having one end in communication with the first booster fluid inlet line and the other end of the first booster line (131) in communication with a second booster fluid inlet line (22122);
the second booster line (132) having one end in communication with a first booster fluid outlet line (2215) and the other end of the second booster line (132) in communication with a second booster fluid outlet line (22152);
and a supercharging mutual backup switching valve (22) is respectively arranged on the first supercharger fluid inlet pipeline and the second supercharger fluid inlet pipeline (22122).
8. The ultra-low temperature liquid pressurization mutual backup unloading device according to claim 7, further comprising an unloading liquid phase main pipe (2), wherein one end of the unloading liquid phase main pipe (2) is provided with a tank car liquid discharging interface (103) for communicating with a tank car liquid discharging port, and one end of the unloading liquid phase main pipe (2) far away from the tank car liquid discharging interface (103) is communicated with the storage tank (20);
the unloading oil filling riser liquid phase arm (23) and the unloading pump (3) are arranged on the unloading liquid phase main pipe (2);
the unloading liquid phase main pipe (2) is connected with a liquid phase branch (4), the connection point of the liquid phase branch (4) on the unloading liquid phase main pipe (2) is positioned between the unloading pump (3) and the storage tank (20), and one end, far away from the unloading liquid phase main pipe (2), of the liquid phase branch (4) is communicated with the first booster fluid inlet pipeline;
a second check valve (6) is arranged on the liquid phase branch (4);
the connection point of the booster first line (131) on the first booster fluid inlet line is located between the connection point of the liquid phase branch (4) and the first booster fluid inlet line and the inlet of the first booster (2213).
9. A multi-unit pressurization mutual gas-backup island unloading device comprises a storage tank (20), and is characterized by further comprising a plurality of pressurization units, and a first booster pipeline (131) and a second booster pipeline (132) which are arranged among the pressurization units;
each pressurizing unit comprises a pressurizing air island unit and a pressurizing liquid unit;
each pressurizing gas island unit comprises a pressurizer (13), a pressurizer fluid inlet pipeline, a pressurizer fluid outlet pipeline (15), and a tank car liquid phase interface (101) and a tank car gas phase interface (102) which are respectively connected with a tank car (1) filled with ultra-low temperature liquid to be unloaded;
each tank car liquid phase interface (101) is arranged on the corresponding supercharger fluid inlet pipeline, and one end, far away from the corresponding tank car liquid phase interface (101), of the supercharger fluid inlet pipeline is communicated with the inlet of the corresponding supercharger (13);
each tank car gas phase interface (102) is arranged on a corresponding pressure booster fluid outlet pipeline (15), and one end, far away from the corresponding tank car gas phase interface (102), of the pressure booster fluid outlet pipeline (15) is communicated with an outlet of a corresponding pressure booster (13);
a first check valve (8) is arranged on each supercharger fluid inlet pipeline;
each pressurizer fluid outlet pipeline is provided with a gas island valve (16) and an unloading crane pipe gas phase arm (17), the gas island valve (16) is close to the outlet of the corresponding pressurizer (13), and the unloading crane pipe gas phase arm (17) is close to the corresponding tank car gas phase interface (102);
a crane pipe gas phase arm valve (18) is arranged on each crane pipe gas phase arm (17) for unloading;
each hydraulic pressurizing unit comprises an unloading liquid phase main pipe (2), one end of each unloading liquid phase main pipe (2) is provided with a tank car liquid unloading interface (103) used for being communicated with a tank car liquid unloading opening, and one end, far away from the tank car liquid unloading interface (103), of each unloading liquid phase main pipe (2) is communicated with a storage tank (20);
each unloading liquid phase main pipe (2) is provided with an unloading crane pipe liquid phase arm (23) and an unloading pump (3);
each unloading liquid phase main pipe (2) is connected with a liquid phase branch (4), the connection point of each liquid phase branch (4) on the corresponding unloading liquid phase main pipe (2) is located between the corresponding unloading pump (3) and the storage tank (20), and one end, far away from the corresponding unloading liquid phase main pipe (2), of each liquid phase branch (4) is communicated with the corresponding booster fluid inlet pipeline;
each liquid phase branch (4) is provided with a second check valve (6);
the supercharger first line (131) communicating with each of the supercharger fluid inlet lines, the connection point of the supercharger first line (131) on each supercharger fluid inlet line being located between the connection point of the respective liquid phase branch (4) with the respective supercharger fluid inlet line and the inlet of the respective supercharger (13);
the booster second line (132) communicating with each booster fluid outlet line (15), the connection point of the booster second line (132) on each booster fluid outlet line (15) being located between the respective air island valve (16) and the outlet of the respective booster (13);
each supercharger fluid inlet line is provided with a mutual boost switching valve (22), the position of each mutual boost switching valve (22) on the respective supercharger fluid inlet line being located between the connection point of the first supercharger line (131) on the respective supercharger fluid inlet line and the inlet of the respective supercharger (13).
10. A method for unloading a vehicle by using the multi-unit pressurizing mutual-backup air island unloading device according to claim 9, wherein the plurality of pressurizing units comprise a first pressurizing unit and a second pressurizing unit, the method comprises the steps of replacing a pressurizer in the first pressurizing unit with a pressurizer in the second pressurizing unit, and unloading the vehicle by using the pressurizer in the second pressurizing unit, and the method comprises the following steps:
step one, switching the superchargers and pre-cooling the self-supercharging and unloading pump (3) by using the switched superchargers: closing a pressurizing mutual-backup switching valve (22) in the first pressurizing unit, opening a pressurizer in the second pressurizing unit and the pressurizing mutual-backup switching valve in the second pressurizing unit, opening a liquid phase branch valve (5) in the first pressurizing unit, a fluid inlet pipeline valve (7) of the pressurizer in the first pressurizing unit, an air island valve (16) in the first pressurizing unit and an oil filling pipe gas phase arm valve (18) in the first pressurizing unit, and closing an air island valve in the second pressurizing unit;
liquid fluid in the tank car (1) is divided into two paths, one path of the liquid fluid flows into a pressure booster in the second pressure boosting unit from a tank car liquid phase interface (101) in the first pressure boosting unit through a pressure booster fluid inlet pipeline in the first pressure boosting unit and a pressure booster first pipeline (131), and flows into the tank car (1) through a pressure booster second pipeline (132);
the other path of liquid fluid in the tank wagon (1) enters a unloading liquid phase main pipe (2) in the first pressurizing unit from a tank wagon unloading interface (103) in the first pressurizing unit, flows through an unloading pump (3) in the first pressurizing unit for precooling, and finishes precooling of the unloading pump (3) when the temperature of the fluid in the unloading pump (3) in the first pressurizing unit is less than or equal to minus 120 ℃;
step two, unloading: closing a fluid inlet pipeline valve (7) of a pressurizer in the first pressurizing unit, keeping a liquid phase branch valve (5) in the first pressurizing unit, an air island valve (16) in the first pressurizing unit and a gas arm valve (18) of an oil filling pipe in the first pressurizing unit open, opening an unloading pump (3) in the first pressurizing unit, and keeping a pressurizing mutual backup switching valve (22) in the first pressurizing unit and an air island valve in the second pressurizing unit closed;
liquid in the tank car (1) enters a liquid phase main pipe (2) of the unloading car in the first pressurizing unit from a tank car unloading interface (103) in the first pressurizing unit, flows through an unloading pump (3) in the first pressurizing unit and then is divided into two branches, fluid in one branch enters a booster (13) in the second pressurizing unit from a liquid phase branch (4) in the first pressurizing unit through a first pipeline (131) of the booster, flows back to the tank car (1) through a second pipeline (132) of the booster and a gas phase arm (17) of the unloading crane in the first pressurizing unit for boosting, and under the combined action of boosting and the unloading pump (3) in the first pressurizing unit, fluid in the other branch continuously flows into a storage tank (20) along the liquid phase main pipe (2) of the unloading car in the first pressurizing unit;
step three, forming a gas island: after unloading is finished, a liquid phase branch valve (5) in the first pressurizing unit and an air island valve (16) in the first pressurizing unit are closed, a fluid inlet pipeline valve (7) of a pressurizer in the first pressurizing unit, an air phase valve (11) in the first pressurizing unit and an air island valve in the second pressurizing unit are kept closed, and air islands are formed under the action of the air island valve (16) in the first pressurizing unit, a first check valve (8) in the first pressurizing unit and a second check valve (6) in the first pressurizing unit; the gas island is a space for storing fluid formed under the action of a gas island valve (16) in the first pressurizing unit, a first check valve (8) in the first pressurizing unit and a second check valve (6) in the first pressurizing unit;
and step four, utilizing the air island in the step three to pressurize the next tank car.
CN202011455641.8A 2020-12-10 2020-12-10 Ultra-low temperature liquid pressurization unloading device and method Active CN112555676B (en)

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CN204328454U (en) * 2014-12-07 2015-05-13 成都润力电气有限公司 One tank one pump two machine LNG filling station
CN205065271U (en) * 2015-10-28 2016-03-02 连云港杰瑞自动化有限公司 Multi -functional LNG integration loading and unloading sledge
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