CN111306440A - Liquid discharge metering device - Google Patents

Liquid discharge metering device Download PDF

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Publication number
CN111306440A
CN111306440A CN201811517282.7A CN201811517282A CN111306440A CN 111306440 A CN111306440 A CN 111306440A CN 201811517282 A CN201811517282 A CN 201811517282A CN 111306440 A CN111306440 A CN 111306440A
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China
Prior art keywords
liquid
pipeline
tank
liquid discharging
phase space
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Granted
Application number
CN201811517282.7A
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Chinese (zh)
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CN111306440B (en
Inventor
吴小芳
孙浩
公茂縢
孙娟
鲍雨晴
周峰
路虎
黄克强
张瑜
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China International Marine Containers Group Co Ltd
Zhangjiagang CIMC Sanctum Cryogenic Equipment Co Ltd
CIMC Enric Investment Holdings Shenzhen Co Ltd
Original Assignee
China International Marine Containers Group Co Ltd
Zhangjiagang CIMC Sanctum Cryogenic Equipment Co Ltd
CIMC Enric Investment Holdings Shenzhen Co Ltd
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Application filed by China International Marine Containers Group Co Ltd, Zhangjiagang CIMC Sanctum Cryogenic Equipment Co Ltd, CIMC Enric Investment Holdings Shenzhen Co Ltd filed Critical China International Marine Containers Group Co Ltd
Priority to CN201811517282.7A priority Critical patent/CN111306440B/en
Publication of CN111306440A publication Critical patent/CN111306440A/en
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Publication of CN111306440B publication Critical patent/CN111306440B/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
    • 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
    • F17C13/002—Details of vessels or of the filling or discharging of vessels for vessels under pressure
    • 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
    • F17C13/02—Special adaptations of indicating, measuring, or monitoring equipment
    • F17C13/023—Special adaptations of indicating, measuring, or monitoring equipment having the mass as the parameter
    • 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
    • F17C13/02—Special adaptations of indicating, measuring, or monitoring equipment
    • F17C13/025—Special adaptations of indicating, measuring, or monitoring equipment having the pressure as the parameter
    • 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
    • F17C13/04—Arrangement or mounting of valves
    • 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
    • F17C2201/00—Vessel construction, in particular geometry, arrangement or size
    • F17C2201/01—Shape
    • F17C2201/0104—Shape cylindrical
    • F17C2201/0109—Shape cylindrical with exteriorly curved end-piece
    • 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
    • F17C2201/00—Vessel construction, in particular geometry, arrangement or size
    • F17C2201/03—Orientation
    • F17C2201/032—Orientation with substantially vertical main axis
    • 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
    • F17C2201/00—Vessel construction, in particular geometry, arrangement or size
    • F17C2201/03—Orientation
    • F17C2201/035—Orientation with substantially horizontal main axis
    • 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
    • F17C2205/00—Vessel construction, in particular mounting arrangements, attachments or identifications means
    • F17C2205/03—Fluid connections, filters, valves, closure means or other attachments
    • F17C2205/0302—Fittings, valves, filters, or components in connection with the gas storage device
    • F17C2205/0323—Valves
    • 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
    • F17C2221/01—Pure fluids
    • F17C2221/011—Oxygen
    • 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
    • F17C2221/01—Pure fluids
    • F17C2221/014—Nitrogen
    • 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
    • F17C2221/01—Pure fluids
    • F17C2221/016—Noble gases (Ar, Kr, Xe)
    • 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
    • F17C2223/0169—Liquefied gas, e.g. LPG, GPL subcooled
    • 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
    • F17C2225/00—Handled fluid after transfer, i.e. state of fluid after transfer from the vessel
    • F17C2225/01—Handled fluid after transfer, i.e. state of fluid after transfer from the vessel characterised by the phase
    • F17C2225/0146—Two-phase
    • F17C2225/0153—Liquefied gas, e.g. LPG, GPL
    • F17C2225/0169—Liquefied gas, e.g. LPG, GPL subcooled
    • 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
    • F17C2250/00—Accessories; Control means; Indicating, measuring or monitoring of parameters
    • F17C2250/06—Controlling or regulating of parameters as output values
    • F17C2250/0605—Parameters
    • F17C2250/0626—Pressure
    • 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
    • F17C2250/00—Accessories; Control means; Indicating, measuring or monitoring of parameters
    • F17C2250/06—Controlling or regulating of parameters as output values
    • F17C2250/0605—Parameters
    • F17C2250/0631—Temperature
    • 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
    • F17C2270/00—Applications
    • F17C2270/01—Applications for fluid transport or storage
    • F17C2270/0165—Applications for fluid transport or storage on the road
    • F17C2270/0168—Applications for fluid transport or storage on the road by vehicles

Abstract

The invention relates to the technical field of pressure containers, in particular to a liquid unloading metering device. The device comprises a first pressure sensor, a second pressure sensor, a liquid discharging pipeline and a control system; the first pressure sensor is used for measuring the pressure of the gas phase space of the liquid discharge tank; the second pressure sensor is used for measuring the pressure of the gas phase space of the receiving tank; the inlet end of the liquid discharging pipeline is communicated with the liquid phase space of the liquid discharging tank, and the outlet end of the liquid discharging pipeline is communicated with the liquid phase space of the receiving tank; the liquid discharging pipeline is provided with a liquid discharging control valve component for controlling the on-off of the liquid discharging pipeline and a quality measuring component for measuring the low-temperature liquid flowing through the liquid discharging pipeline; the liquid discharging control valve assembly, the quality measuring assembly, the first pressure sensor and the second pressure sensor are all electrically connected with the control system. The control system can calculate the quality of the low-temperature liquid flowing through the liquid discharging pipeline, and the error of a calculated value of the liquid discharging amount of the liquid discharging tank is greatly reduced.

Description

Liquid discharge metering device
Technical Field
The invention relates to the technical field of pressure containers, in particular to a liquid unloading metering device.
Background
At present, the pressure vessel is mainly used for freezing liquefied gas, and specifically, the pressure vessel is a cryogenic vacuum vessel for loading low-temperature liquid such as liquefied natural gas, liquid nitrogen, liquid argon, liquid oxygen and the like. The pressure vessel can be divided into a liquid discharge tank and a receiving tank by function. When the low-temperature liquid is transferred from the liquid discharging tank to the receiving tank, the pressure in the liquid discharging tank needs to be boosted by a booster, and then the low-temperature liquid can be transferred.
Taking a tank truck as a liquid discharge tank and a storage tank as a receiving tank, the tank truck is loaded with liquefied natural gas and the tank truck needs to discharge the liquefied natural gas into the storage tank. When the pressure in the storage tank is higher than the pressure in the tank truck, the pressure in the storage tank needs to be firstly discharged. Because natural gas has the characteristics of flammability and explosiveness, the discharge of atmosphere is forbidden, and then the gas discharged from the storage tank needs to be recycled into the tank car, and after the pressure in the storage tank and the pressure in the tank car are balanced, the tank car is pressurized. The pressure booster is mostly adopted to boost the tank car in the tradition, specifically, after the liquefied natural gas in the tank car evaporates into gaseous natural gas after booster and atmospheric heat exchange, carry gaseous natural gas in the tank car to make tank car pressure rise, so have certain pressure differential between tank car and the storage tank, make the liquefied natural gas in the tank car transfer to in the storage tank.
The current liquid discharging mode has the following problems: the density of the low-temperature liquid changes along with the change of the temperature of the low-temperature liquid in the transmission process from the liquid discharging tank to the receiving tank, the liquid discharging tank adopts a metering device which generally meters the transmitted low-temperature liquid according to the volume, but the liquid discharging tank meters the transmitted low-temperature liquid according to the quality during trade settlement, and if the liquid discharging tank calculates according to the same density, the error is larger.
Disclosure of Invention
The invention aims to provide a liquid discharge metering device to solve the problem that the error of a calculated value of the liquid discharge amount of a liquid discharge tank is large at present.
The purpose of the invention is realized by the following technical scheme:
the invention provides a liquid discharging metering device which comprises a first pressure sensor, a second pressure sensor, a liquid discharging pipeline and a control system, wherein the first pressure sensor is connected with the second pressure sensor; the first pressure sensor is used for measuring the pressure of the gas phase space of the liquid discharge tank; the second pressure sensor is used for measuring the pressure of the gas phase space of the receiving tank; the inlet end of the liquid discharging pipeline is communicated with the liquid phase space of the liquid discharging tank, and the outlet end of the liquid discharging pipeline is communicated with the liquid phase space of the receiving tank; the liquid discharging pipeline is provided with a liquid discharging control valve component for controlling the on-off of the liquid discharging pipeline and a quality measuring component for measuring the low-temperature liquid flowing through the liquid discharging pipeline; the liquid unloading control valve assembly, the quality measuring assembly, the first pressure sensor and the second pressure sensor are all electrically connected with the control system; the control system can receive the data transmitted by the quality measuring assembly, and further calculate the quality of the low-temperature liquid flowing through the liquid discharging pipeline.
Preferably, the mass measurement assembly comprises a volume flow meter for measuring the volume of cryogenic liquid flowing through the tapping line and a temperature sensor for measuring the temperature of cryogenic liquid flowing through the tapping line; the volume flowmeter and the temperature sensor are both electrically connected with the control system and are both arranged on the liquid discharge pipeline; the control system can receive the temperature data transmitted by the temperature sensor to calculate the density of the low-temperature liquid flowing through the liquid discharging pipeline, and can receive the volume data transmitted by the volume flowmeter to further calculate the quality of the low-temperature liquid flowing through the liquid discharging pipeline.
Preferably, the liquid unloading pipeline comprises a liquid unloading branch and a liquid unloading hose; the inlet end of the liquid discharging branch is communicated with the liquid phase space of the liquid discharging tank; the liquid unloading branch is provided with the liquid unloading control valve assembly and the volume flowmeter; one end of the liquid unloading hose is communicated with the outlet end of the liquid unloading branch, and the other end of the liquid unloading hose is communicated with the liquid phase space of the receiving tank.
Preferably, the mass measurement assembly is a mass flow meter; the mass flow meter is capable of communicating mass data to the control system.
Preferably, a return air pipeline is further included; the inlet end of the gas return pipeline is communicated with the gas phase space of the receiving tank, and the outlet end of the gas return pipeline is communicated with the gas phase space of the liquid discharging tank; the air return pipeline is provided with an air return control valve component for controlling the on-off of the air return pipeline; the air return control valve assembly is electrically connected with the control system; when the pressure data measured by the first pressure sensor is smaller than the pressure data measured by the second pressure sensor, the control system drives the air return control valve assembly to be opened, so that the low-temperature gas in the receiving tank flows to the liquid discharging tank through the air return pipeline under the action of pressure difference.
Preferably, the air return pipeline comprises an air return branch and an air return hose; the outlet end of the gas return branch is communicated with the gas phase space of the liquid discharging tank; the air return control valve component is arranged on the air return branch; one end of the air return hose is communicated with the inlet end of the air return branch, and the other end of the air return hose is used for being communicated with the gas phase space of the receiving tank.
Preferably, the air return branch comprises a first pipeline for communicating with the gas phase space of the liquid discharge tank, and a second pipeline positioned between the first pipeline and the air return hose; the first pipeline is communicated with the air return hose through the second pipeline; the second pipeline is provided with the air return control valve component.
Preferably, a pressurization pipeline is further included; the inlet end of the pressurizing pipeline is communicated with the liquid phase space of the liquid discharging tank, and the outlet end of the pressurizing pipeline is communicated with the inlet end of the first pipeline and further communicated with the gas phase space of the liquid discharging tank; the pressurizing pipeline is provided with a supercharger used for vaporizing the low-temperature liquid in the liquid discharging tank into low-temperature gas and a pressurizing control valve component used for controlling the on-off of the pressurizing pipeline; the pressurization control valve assembly is electrically connected with the control system.
Preferably, the liquid unloading control valve assembly comprises a liquid unloading emergency cut-off valve arranged on the liquid unloading pipeline and a liquid unloading electromagnetic valve electrically connected with the control system; the liquid unloading electromagnetic valve is connected with the liquid unloading emergency cut-off valve so as to control the opening and closing of the liquid unloading emergency cut-off valve; the air return control valve assembly comprises an air return emergency cut-off valve arranged on the air return pipeline and an air return electromagnetic valve electrically connected with the control system; the air return electromagnetic valve is connected with the air return emergency cut-off valve so as to control the opening and closing of the air return emergency cut-off valve; the pressurization control valve assembly comprises a pressurization emergency cut-off valve arranged on the pressurization pipeline and a pressurization electromagnetic valve electrically connected with the control system; the pressure boost solenoid valve with pressure boost emergency cut-off valve is connected to control the switch of pressure boost emergency cut-off valve.
Preferably, the second pressure sensor is located on the return air line upstream of the return air control valve assembly.
According to the technical scheme, the invention has the advantages and positive effects that: the first pressure sensor measures the pressure in the fluid-discharge tank, and the second pressure sensor measures the pressure in the receiving tank; the inlet end and the outlet end of the liquid discharging pipeline are respectively communicated with the liquid phase space of the liquid discharging tank and the liquid phase space of the receiving tank; the liquid discharging pipeline is provided with a liquid discharging control valve component for controlling the on-off of the liquid discharging pipeline and a quality measuring component for measuring the low-temperature liquid flowing through the liquid discharging pipeline; the liquid discharging control valve assembly and the quality measuring assembly are electrically connected with the control system. When the pressure data measured by the first pressure sensor is larger than the pressure data measured by the second pressure sensor, the control system drives the liquid unloading control valve assembly to be opened, so that the low-temperature liquid in the liquid unloading tank flows to the receiving tank through the liquid unloading pipeline under the action of pressure difference; the quality measurement assembly transmits data to the control system, and then the control system can calculate the quality of the low-temperature liquid flowing through the liquid discharging pipeline, and the error of a calculated value of the liquid discharging amount of the liquid discharging tank is greatly reduced.
Drawings
For the purpose of easy explanation, the present invention will be described in detail with reference to the following preferred embodiments and the accompanying drawings.
FIG. 1 is a schematic structural diagram of a preferred embodiment of the liquid-discharging metering device of the present invention.
Description of reference numerals: 1. a liquid discharge pipeline; 11. a liquid discharging branch; 111. a liquid phase discharging port; 12. a liquid discharge hose; 13. a fluid dump control valve assembly; 131. a liquid-discharging emergency cut-off valve; 132. a liquid discharge electromagnetic valve; 14. a mass measurement component; 141. a volumetric flow meter; 142. a temperature sensor; 2. a gas return line; 21. a gas return branch; 211. a first pipeline; 212. a second pipeline; 213. a liquid and gas phase discharging port; 22. a return air hose; 23. a return air control valve assembly; 231. an air return emergency cut-off valve; 232. an air return electromagnetic valve; 24. a second pressure sensor; 3. a pressurization pipeline; 31. a supercharger; 32. a boost control valve assembly; 321. a pressure boost emergency cut-off valve; 322. a booster solenoid valve; 33. a one-way valve; 4. a first pressure sensor; 5. a control system; 6. discharging the liquid tank; 7. a receiving tank; 71. a liquid phase branch circuit; 711. a liquid receiving port; 72. a gas phase branch circuit; 721. a gas phase receiving port.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like, indicate orientations and positional relationships based on those shown in the drawings, and are used only for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be considered as limiting the present invention. Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", may explicitly or implicitly include one or more of the described features. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
In the description of the present invention, it should be noted that the terms "mounted," "connected," and "connected" are to be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally connected unless otherwise explicitly stated or limited. Either mechanically or electrically. Either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
The invention provides a liquid unloading metering device which is used for calculating the liquid unloading amount transmitted from a liquid unloading tank to a receiving tank.
Wherein, the liquid discharging tank 6 and the receiving tank 7 can adopt fixed pressure containers and can also adopt movable pressure containers such as tank cars and the like. Referring to fig. 1, the dump tank 6 stores cryogenic liquids including, but not limited to, liquefied natural gas, liquid nitrogen, liquid argon, liquid oxygen, etc. The receiving tank 7 is provided with a liquid phase branch 71 and a gas phase branch 72, and both the liquid phase branch 71 and the gas phase branch 72 penetrate out of the receiving tank 7. One end of the liquid phase branch 71 communicates with the liquid phase space of the receiver tank 7, and the other end of the liquid phase branch 71 is provided with a liquid phase receiving port 711. One end of the gas phase branch 72 communicates with the gas phase space of the receiving tank 7, and the other end of the gas phase branch 72 is provided with a gas phase receiving port 721.
In this embodiment, the liquid discharging and metering device includes a first pressure sensor 4, a second pressure sensor 24, a control system 5, a pressurization pipeline 3, a liquid discharging pipeline 1 and a gas return pipeline 2.
Wherein, the liquid discharging pipeline 1 and the gas return pipeline 2 are connected in parallel. The inlet end of the liquid discharging pipeline 1 is communicated with the liquid phase space of the liquid discharging tank 6, and the outlet end of the liquid discharging pipeline 1 is communicated with the liquid phase space of the receiving tank 7. The inlet end of the gas return line 2 is adapted to communicate with the gas phase space of the receiving tank 7 and the outlet end thereof is adapted to communicate with the gas phase space of the discharge tank 6. The inlet end of the pressurizing pipeline 3 is communicated with the liquid phase space of the liquid discharging tank 6, and the outlet end of the pressurizing pipeline is communicated with the gas phase space of the liquid discharging tank 6. The first pressure sensor 4 is used to measure the pressure in the gas phase space of the liquid discharge tank 6. The second pressure sensor 24 is used to measure the pressure of the gas phase space of the receiving tank 7. The first pressure sensor 4 and the second pressure sensor 24 are both electrically connected to the control system 5. The control system 5 is arranged outside the liquid discharge line 1.
The liquid discharging pipeline 1 comprises a liquid discharging branch 11 and a liquid discharging hose 12.
The inlet end of the liquid discharging branch 11 is used for being communicated with the liquid phase space of the liquid discharging tank 6, and the outlet end of the liquid discharging branch 11 is provided with a liquid discharging phase port 111. The liquid unloading branch 11 is provided with a liquid unloading control valve assembly 13 for controlling the on-off of the liquid unloading pipeline 1 and a quality measuring assembly 14 for measuring the physical properties of the low-temperature liquid flowing through the liquid unloading pipeline 1.
The liquid unloading control valve assembly 13 comprises an emergency cut-off valve arranged on the liquid unloading branch 11, and a liquid unloading electromagnetic valve 132 connected with the liquid unloading emergency cut-off valve 131 to control the on and off of the liquid unloading emergency cut-off valve 131.
The mass measurement assembly 14 includes a volume flow meter 141 for measuring the volume of the cryogenic liquid flowing through the dump line 1 and a temperature sensor 142 for measuring the temperature of the cryogenic liquid flowing through the dump line 1. The volume flow meter 141 and the temperature sensor 142 are both electrically connected to the control system 5 and are both disposed on the liquid discharge branch 11. The volumetric flow meter 141 is located downstream of the liquid discharge control valve assembly 13, and the temperature sensor 142 is located downstream of the volumetric flow meter 141, which is suitable for the case where the liquid discharge tank 6 employs a mobile pressure vessel. The volume flow meter 141, the temperature sensor 142 and the liquid discharge solenoid valve 132 are electrically connected to the control system 5 to be controlled by the control system 5.
One end of the liquid discharging hose 12 is detachably connected with the liquid discharging port 111 and is communicated with the liquid discharging port 111, and the other end of the liquid discharging hose 12 is detachably connected with the liquid receiving port 711 and is communicated with the liquid receiving port 711.
The return air line 2 comprises a return air branch 21 and a return air hose 22.
The return air branch 21 includes a first line 211 for communicating the gas phase space of the relief tank 6, and a second line 212 between the first line 211 and the return air hose 22. The first line 211 communicates with the return hose 22 through a second line 212. Specifically, the outlet end of the first line 211 communicates with the gas phase space of the discharge tank 6, and the inlet end of the first line 211 meets and communicates with the outlet end of the second line 212. The inlet end of the second line 212 is provided with a liquid discharge gas phase port 213.
The second pipeline 212 is provided with a return air control valve assembly 23 for controlling the on/off of the return air pipeline 2. The return air control valve assembly 23 includes a return air quick shut valve 231 provided on the second line 212, and a return air solenoid valve 232 connected to the return air quick shut valve 231 to control the opening and closing of the return air quick shut valve 231. The air return solenoid valve 232 is electrically connected to the control system 5 to be controlled by the control system 5.
One end of the air return hose 22 is detachably connected to and communicated with the liquid and gas discharging port 213, and the other end of the air return hose 22 is detachably connected to and communicated with the gas receiving port 721.
The outlet end of the pressurizing line 3 communicates with the inlet end of the first line 211, and the inlet end of the pressurizing line 3 communicates with the liquid phase space of the liquid discharge tank 6. The booster line 3 is provided with a check valve 33, a booster 31 located upstream of the check valve 33, and a booster control valve assembly 32 located upstream of the booster 31.
The pressure booster 31 is used for vaporizing the low-temperature liquid in the liquid discharging tank into low-temperature gas. The check valve 33 controls the flow of the low-temperature gas vaporized by the supercharger 31 to the gas phase space of the liquid discharging tank and prevents the low-temperature gas in the liquid discharging tank from entering the supercharger 31.
The booster control valve assembly 32 includes a booster quick action emergency valve 321 provided on the booster line 3, and a booster solenoid valve 322 connected to the booster quick action emergency valve 321 to control the opening and closing of the booster quick action emergency valve 321. The pressure-increasing solenoid valve 322 is electrically connected to the control system 5 to be controlled by the control system 5.
The first pressure sensor 4 is arranged on the liquid discharge tank 6 to measure the pressure of the gas phase space of the liquid discharge tank 6 and obtain the pressure data of the gas phase space of the liquid discharge tank 6.
The second pressure sensor 24 is provided on the second pipeline 212 and communicates with the gas phase space of the receiving tank 7 through the second pipeline 212, the return air hose 22 and the gas phase branch 72 to measure the pressure of the gas phase space of the receiving tank 7 and acquire pressure data of the gas phase space of the receiving tank 7. The second pressure sensor 24 is located upstream of the return air quick shut valve 231.
The working principle of the embodiment is as follows: first, both ends of the liquid discharge hose 12 are connected to the liquid discharge port 111 and the gas receiving port 711, respectively, and both ends of the gas return hose 22 are connected to the liquid discharge port 213 and the gas receiving port 721, respectively. The control system 5 is activated and the control system 5 receives the data measured by the first and second sensors and compares the data from the first pressure sensor 4 with the data from the second pressure sensor 24 to compare the pressure in the gas phase space in the purge tank 6 with the pressure in the gas phase space in the receiver tank 7.
When the data measured by the first pressure sensor 4 is smaller than the data measured by the second pressure sensor 24, the control system 5 drives the return gas emergency cut-off valve 231 to open through the return gas solenoid valve 232, and drives the liquid discharge emergency cut-off valve 131 and the pressure boost emergency cut-off valve 321 to close through the liquid discharge solenoid valve 132 and the pressure boost solenoid valve 322, so that the low-temperature gas in the receiving tank 7 flows to the liquid discharge tank 6 through the gas phase branch 72, the return gas hose 22, the second pipeline 212 and the first pipeline 211 under the action of the pressure difference.
When the data measured by the first pressure sensor 4 is not less than the data measured by the second pressure sensor 24 and the difference between the pressure in the unloading tank 6 and the pressure in the receiving tank 7 is less than the first set value, the control system 5 drives the boost emergency cut-off valve 321 to open through the boost solenoid valve 322, so that the booster 31 vaporizes the cryogenic liquid in the unloading tank 6 into cryogenic gas, and the cryogenic gas enters the gas phase space of the unloading tank 6 to increase the pressure of the gas phase space of the unloading tank 6. It is worth mentioning that when the pressure value of the gas phase space of the dump tank 6 is not less than the working pressure of the dump tank 6, or the difference between the pressure in the dump tank 6 and the pressure in the receiving tank 7 is not less than the first set value, the control system 5 drives the boost quick cut valve 321 to close through the boost solenoid valve 322.
When the pressure of the gas phase space in the receiving tank 7 is higher than the pressure of the gas phase space of the liquid unloading tank 6, the control system 5 drives the liquid unloading emergency cut-off valve 131 to be opened through the liquid unloading solenoid valve 132, and the low-temperature liquid in the liquid unloading tank 6 enters the receiving tank 7 through the volume flow meter 141 and the temperature sensor 142.
In the process of discharging liquid, the pressure of the gas phase space of the liquid discharging tank 6 is reduced along with the outflow of the low-temperature liquid, when the pressure difference between the gas phase space of the liquid discharging tank 6 and the gas phase space of the receiving tank 7 is smaller than a second set value, the control system 5 drives the pressurizing emergency cut-off valve 321 to open through the pressurizing electromagnetic valve 322, the pressurizer 31 works to vaporize the low-temperature liquid into low-temperature gas so as to increase the pressure of the gas phase space of the liquid discharging tank 6, and further the pressure difference between the gas phase space of the liquid discharging tank 6 and the gas phase space of the receiving tank 7 is not smaller than the second set value, at this time, the liquid discharging emergency cut-off valve 131 is still in an open state, and the. The second set value is less than the first set value.
The control system 5 can receive the temperature data transmitted from the temperature sensor 142, calculate the density of the low-temperature liquid flowing through the liquid discharge pipeline 1 by using the relationship between the temperature and the density of the low-temperature liquid, receive the volume data transmitted from the volume flowmeter 141 to obtain the volume of the low-temperature liquid flowing through the liquid discharge pipeline 1, further calculate the mass of the low-temperature liquid flowing through the liquid discharge pipeline 1 by multiplying the volume by the density, and calculate the total liquid discharge amount by accumulation. The control system 5 can calculate the return air time of the low-temperature gas transmitted from the receiving tank 7 to the liquid discharging tank 6 through the opening time of the return air emergency cut-off valve 231, and the return air time is multiplied by the return air speed to obtain the return air quantity. And subtracting the air return amount by using the total liquid discharge amount to finally obtain the actual liquid discharge amount. It is worth mentioning that the return air velocity is an empirically estimated value. Of course, a volume flow meter and a temperature sensor may be disposed on the gas return line 2 to obtain the gas return amount.
In other embodiments not shown, the mass measurement assembly may employ a mass flow meter; the mass flow meter is arranged on the liquid discharging branch and is electrically connected with the control system so as to transmit mass data to the control system, and the mass flow meter is suitable for the condition that the liquid discharging tank adopts a fixed pressure container.
The invention has at least the following advantages:
the first pressure sensor 4 measures the pressure of the gas phase space of the relief tank 6, while the second pressure sensor 24 measures the pressure of the gas phase space of the receiving tank 7; the inlet end and the outlet end of the liquid discharging pipeline 1 are respectively communicated with the liquid phase space of the liquid discharging tank 6 and the liquid phase space of the receiving tank 7; the liquid discharging pipeline 1 is provided with a liquid discharging control valve component 13 for controlling the on-off of the liquid discharging pipeline 1 and a quality measuring component 14 for measuring the physical property of the low-temperature liquid flowing through the liquid discharging pipeline 1; the liquid discharge control valve assembly 13 and the mass measurement assembly 14 are both electrically connected to the control system 5. When the pressure data measured by the first pressure sensor 4 is greater than the pressure data measured by the second pressure sensor 24, that is, when the pressure in the liquid discharge tank 6 is greater than the pressure in the receiving tank 7, the control system 5 drives the liquid discharge control valve assembly 13 to open, so that the low-temperature liquid in the liquid discharge tank 6 flows to the receiving tank 7 through the liquid discharge pipeline 1 under the action of pressure difference; the mass measurement component 14 transmits data to the control system 5, and then the control system 5 can calculate the mass of the low-temperature liquid flowing through the liquid discharging pipeline 1, so that the error of the calculated value of the liquid discharging amount of the liquid discharging tank 6 is greatly reduced.
In the description of the present specification, reference to the description of the terms "one embodiment", "some embodiments", "an illustrative embodiment", "an example", "a specific example", or "some examples", etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.

Claims (10)

1. A liquid discharge metering device, comprising:
the first pressure sensor is used for measuring the pressure of the gas phase space of the liquid discharge tank;
a second pressure sensor for measuring the pressure of the gas phase space of the receiving tank;
the inlet end of the liquid discharging pipeline is communicated with the liquid phase space of the liquid discharging tank, and the outlet end of the liquid discharging pipeline is communicated with the liquid phase space of the receiving tank; the liquid discharging pipeline is provided with a liquid discharging control valve component for controlling the on-off of the liquid discharging pipeline and a quality measuring component for measuring the low-temperature liquid flowing through the liquid discharging pipeline;
a control system; the liquid unloading control valve assembly, the quality measuring assembly, the first pressure sensor and the second pressure sensor are all electrically connected with the control system; the control system can receive the data transmitted by the quality measuring assembly, and further calculate the quality of the low-temperature liquid flowing through the liquid discharging pipeline.
2. The liquid discharge metering device of claim 1, wherein the mass measurement assembly comprises a volumetric flow meter for measuring the volume of cryogenic liquid flowing through the liquid discharge line and a temperature sensor for measuring the temperature of cryogenic liquid flowing through the liquid discharge line; the volume flowmeter and the temperature sensor are both electrically connected with the control system and are both arranged on the liquid discharge pipeline;
the control system can receive the temperature data transmitted by the temperature sensor to calculate the density of the low-temperature liquid flowing through the liquid discharging pipeline, and can receive the volume data transmitted by the volume flowmeter to further calculate the quality of the low-temperature liquid flowing through the liquid discharging pipeline.
3. The liquid discharge metering device of claim 2, wherein the liquid discharge line comprises:
a liquid discharging branch; the inlet end of the liquid discharging branch is communicated with the liquid phase space of the liquid discharging tank; the liquid unloading branch is provided with the liquid unloading control valve assembly and the volume flowmeter;
a liquid discharge hose; one end of the liquid unloading hose is communicated with the outlet end of the liquid unloading branch, and the other end of the liquid unloading hose is communicated with the liquid phase space of the receiving tank.
4. The liquid discharge metering device of claim 1, wherein the mass measuring assembly is a mass flow meter; the mass flow meter is capable of communicating mass data to the control system.
5. A liquid discharge metering device according to claim 1, further comprising a return air line; the inlet end of the gas return pipeline is communicated with the gas phase space of the receiving tank, and the outlet end of the gas return pipeline is communicated with the gas phase space of the liquid discharging tank; the air return pipeline is provided with an air return control valve component for controlling the on-off of the air return pipeline; the air return control valve assembly is electrically connected with the control system;
when the pressure data measured by the first pressure sensor is smaller than the pressure data measured by the second pressure sensor, the control system drives the air return control valve assembly to be opened, so that the low-temperature gas in the receiving tank flows to the liquid discharging tank through the air return pipeline under the action of pressure difference.
6. A liquid discharge metering device as set forth in claim 5 wherein said return air line includes:
a gas return branch; the outlet end of the gas return branch is communicated with the gas phase space of the liquid discharging tank; the air return control valve component is arranged on the air return branch;
a return air hose; one end of the air return hose is communicated with the inlet end of the air return branch, and the other end of the air return hose is used for being communicated with the gas phase space of the receiving tank.
7. The liquid discharge metering device of claim 6, wherein the air return branch comprises a first pipeline for communicating with a gas phase space of the liquid discharge tank, and a second pipeline positioned between the first pipeline and the air return hose; the first pipeline is communicated with the air return hose through the second pipeline; the second pipeline is provided with the air return control valve component.
8. The liquid discharge metering device of claim 7, further comprising a pressurization line; the inlet end of the pressurizing pipeline is communicated with the liquid phase space of the liquid discharging tank, and the outlet end of the pressurizing pipeline is communicated with the inlet end of the first pipeline and further communicated with the gas phase space of the liquid discharging tank;
the pressurizing pipeline is provided with a supercharger used for vaporizing the low-temperature liquid in the liquid discharging tank into low-temperature gas and a pressurizing control valve component used for controlling the on-off of the pressurizing pipeline; the pressurization control valve assembly is electrically connected with the control system.
9. The liquid discharge metering device according to claim 8, wherein the liquid discharge control valve assembly comprises a liquid discharge emergency cut-off valve arranged on the liquid discharge pipeline and a liquid discharge electromagnetic valve electrically connected with the control system; the liquid unloading electromagnetic valve is connected with the liquid unloading emergency cut-off valve so as to control the opening and closing of the liquid unloading emergency cut-off valve;
the air return control valve assembly comprises an air return emergency cut-off valve arranged on the air return pipeline and an air return electromagnetic valve electrically connected with the control system; the air return electromagnetic valve is connected with the air return emergency cut-off valve so as to control the opening and closing of the air return emergency cut-off valve;
the pressurization control valve assembly comprises a pressurization emergency cut-off valve arranged on the pressurization pipeline and a pressurization electromagnetic valve electrically connected with the control system; the pressure boost solenoid valve with pressure boost emergency cut-off valve is connected to control the switch of pressure boost emergency cut-off valve.
10. The liquid discharge metering device of claim 5, wherein the second pressure sensor is disposed on the return air line upstream of the return air control valve assembly.
CN201811517282.7A 2018-12-12 2018-12-12 Liquid discharge metering device Active CN111306440B (en)

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KR100733157B1 (en) * 2006-08-28 2007-06-28 모던산업가스(주) Lng carrier function test mechanism
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