CN108534820B - Method for measuring dynamic evaporation rate of cryogenic liquid tank container - Google Patents
Method for measuring dynamic evaporation rate of cryogenic liquid tank container Download PDFInfo
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- CN108534820B CN108534820B CN201810257088.3A CN201810257088A CN108534820B CN 108534820 B CN108534820 B CN 108534820B CN 201810257088 A CN201810257088 A CN 201810257088A CN 108534820 B CN108534820 B CN 108534820B
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- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D21/00—Measuring or testing not otherwise provided for
Abstract
The invention belongs to the field of new energy equipment, and provides a method for measuring the dynamic evaporation rate of a cryogenic liquid tank container, which comprises the following steps: fixing the cryogenic liquid tank container on a ship motion simulation platform through a container bracket, filling the cryogenic liquid tank container to a rated filling rate, and installing an exhaust pipeline after filling is finished; after the standing is finished, when the pressure of the container inner container is close to zero, the exhaust pipeline is dismounted, the gas flow testing system is installed, and data are collected; after the standing is finished again, if the data of the gas mass flow meter does not have obvious mutation, the dynamic evaporation rate is measured, and if the data fluctuate greatly, the steps are repeated; after the measurement is finished, the dynamic evaporation rate is calculated. The invention can simulate the mechanical environment of the tank container in the transportation process, and calculate the evaporation rate of the cryogenic liquid in the tank container by measuring the flow of the exhaust gas of the tank container.
Description
Technical Field
The invention belongs to the field of new energy equipment, and relates to a method for measuring the dynamic evaporation rate of a cryogenic liquid tank container.
Background
The deep cooling liquefied gas for the transportation of the tank container can realize the combined transportation of sea transportation and land transportation, a receiving station and a reliquefaction device are not needed, and the sea and land combined transportation can be realized by utilizing the existing container wharf, bulk carriers and container transport vehicles. The transportation mode can realize the door-to-door service and is particularly suitable for the transportation and storage of liquefied gas in remote areas. However, some cryogenic liquefied gases belong to dangerous liquids, such as liquefied natural gas and liquid hydrogen, and cannot be transported by sea due to related dangerous goods transportation regulations.
One of the main factors limiting the marine transportation is that the evaporation characteristics of the cryogenic liquid in the cryogenic liquid tank container are not clear in the marine transportation process, and if the pressure of the tank body is too high due to the evaporation of a large amount of the cryogenic liquid in the cryogenic liquid tank container during the transportation process, the safety valve is opened to empty the gas, so that resources are wasted, and the safety of other goods on the ship is threatened. Therefore, the research on the dynamic evaporation characteristics of the tank container during the marine transportation process has an important driving role in comprehensively developing the marine transportation of the tank container.
At present, only a method for measuring the static evaporation rate of a cryogenic liquid tank container exists, and no relevant research and report exist on the method for measuring the dynamic evaporation rate in the transportation process.
Disclosure of Invention
Aiming at the technical problems, the invention provides a method for measuring the dynamic evaporation rate of a cryogenic liquid tank container.
In order to achieve the purpose, the technical scheme of the invention is as follows:
a method for measuring the dynamic evaporation rate of a cryogenic liquid tank container is realized based on a measuring device, and the measuring device comprises a container bracket 1, a ship motion simulation platform 2, an air flow testing system and an exhaust pipeline 3. The gas flow test system is used for measuring the flow of the evaporation gas of the cryogenic liquid tank container 15 and comprises a first connecting pipe 6, a gas mass flow meter 7, a second connecting pipe 8 and an environmental parameter recorder 9. One end of the first connecting pipe 6 is provided with a flange plate 10, the flange plate 10 is connected with an emptying pipeline of the cryogenic liquid tank container, the other end of the first connecting pipe 6 is provided with a reducer pipe 11, and the reducer pipe 11 is connected with an air inlet 12 of the gas mass flowmeter 7. And the air inlet of the second connecting pipe 8 is connected with the air outlet 13 of the gas mass flowmeter 7, and the air outlet of the second connecting pipe 8 is placed outdoors. The environmental parameter recorder 9 is placed outdoors and near the air outlet of the second connecting pipe 8. The flange plate 14 is arranged at the air inlet of the exhaust pipeline 3, the flange plate 14 is connected with the emptying pipeline of the cryogenic liquid tank container, and the air outlet of the exhaust pipeline 3 is placed outdoors.
When the exhaust gas of the cryogenic liquid tank container is flammable, explosive or toxic gas, a gas treatment device or a gas recovery device needs to be installed at the gas outlet of the second connecting pipe 8 or the gas outlet of the exhaust pipeline 3.
In order to ensure the safety of the test, the first connecting pipe 6, the second connecting pipe 8 and the exhaust pipeline 3 are all low-temperature-resistant and corrosion-resistant corrugated pipes with metal mesh sleeves, and the materials of the corrugated pipes do not react with the gas to be tested.
Under the working state, the method for measuring the dynamic evaporation rate of the cryogenic liquid tank container comprises the following steps:
(1) the cryogenic liquid tank container is fixed on a container bracket 1 through an angle piece and a dovetail lock 4, and the container bracket 1 is fixed on a ship body motion simulation platform 2.
(2) The cryogenic liquid tank container is filled to a nominal fill rate.
(3) After the completion of the charging, the exhaust line 3 is installed.
(4) After standing, when the pressure of an inner container meter of the cryogenic liquid tank container is close to zero, the exhaust pipeline 3 is dismounted, a gas flow testing system is installed, data are collected in time of not more than 10min, and the numerical value, the ambient temperature, the atmospheric pressure, the inlet temperature and the inlet pressure of the gas mass flowmeter are recorded; and standing for at least 24 h.
(5) After standing, checking data of the gas mass flow meter 7 within the latest 2h, and starting the next measurement if the gas mass flow has no obvious mutation; and (4) if the gas flow rate greatly fluctuates, repeating the step (4).
(6) When the dynamic evaporation rate is measured, firstly, the motion parameters (amplitude, frequency and waveform category) corresponding to the test working condition are input into the control system of the ship body motion simulation platform 2, then, the ship body motion simulation platform 2 is started, data are collected in time not more than 10min, the numerical value of the gas mass flowmeter 7, the ambient temperature, the atmospheric pressure, the inlet temperature and the inlet pressure of the flowmeter are recorded, and the recording time is not less than 36 h.
(7) After the measurement is finished, the data of the gas mass flowmeter 7 is read, the difference value of the gas accumulated flow value in the last 24h is calculated, and the dynamic evaporation rate is calculated.
The invention has the beneficial effects that: the invention can simulate the mechanical environment of the tank container in the transportation process, and calculate the evaporation rate of the cryogenic liquid in the tank container by measuring the flow of the exhaust gas of the tank container. And deducing the change of the gas phase pressure under the test working condition under the condition that the corresponding tank body is closed by utilizing the relation among the standard gas pressure, the volume and the temperature, thereby obtaining the maintenance time of the tank container under the corresponding working condition. In addition, the method for measuring the dynamic evaporation rate of the cryogenic liquid tank container is suitable for measuring the dynamic evaporation rate of all cryogenic media.
Drawings
FIG. 1 is a schematic view of the connection of the measuring pipeline of the method for measuring the dynamic evaporation rate of the cryogenic liquid tank container according to the present invention;
FIG. 2 is a schematic structural diagram of a container bracket of a method for measuring the dynamic evaporation rate of a cryogenic liquid tank container according to the present invention;
FIG. 3 is a schematic diagram of a first connection pipe structure of a method for measuring a dynamic evaporation rate of a cryogenic liquid tank container according to the present invention;
FIG. 4 is a schematic structural diagram of an exhaust pipe of a method for measuring a dynamic evaporation rate of a cryogenic liquid tank container according to the present invention;
in the figure: the container comprises a container bracket 1, a ship motion simulation platform 2, an exhaust pipeline 3, a dovetail lock 4, a bolt pore plate 5, a first connecting pipe 6, a gas mass flowmeter 7, a second connecting pipe 8, an environmental parameter recorder 9, a flange plate 10, a reducer pipe 11, a gas mass flowmeter 12, a gas mass flowmeter 13, a flange plate 14 and a cryogenic liquid tank container 15.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
A method for measuring the dynamic evaporation rate of a cryogenic liquid tank container is realized based on a measuring device, and the measuring device comprises a container bracket 1, a ship motion simulation platform 2, an air flow testing system and an exhaust pipeline 3.
The container bracket 1 is used for supporting and fixing a cryogenic liquid tank container 15, a dovetail lock 4 is installed on the upper portion of the container bracket 1, and the dovetail lock 4 is installed on the container bracket 1 according to the position of an upper corner piece of a bottom framework of the cryogenic liquid container 15 to be detected. The lower part of the container bracket 1 is provided with a bolt hole plate 5, and the bolt hole plate 5 is connected with a bolt hole plate on a working platform of the ship motion simulation platform 2.
The measuring system is used for measuring the gas flow of the cryogenic liquid tank container 15 and comprises a first connecting pipe 6, a gas mass flow meter 7, a second connecting pipe 8 and an environmental parameter recorder 9. One end of the first connecting pipe 6 is provided with a flange plate 10, the flange plate 10 is connected with an emptying pipeline of a cryogenic liquid tank container 15, the other end of the first connecting pipe 6 is provided with a reducer pipe 11, and the reducer pipe 11 is connected with an air inlet 12 of a gas mass flowmeter. And the air inlet of the second connecting pipe 8 is connected with the air outlet 13 of the gas mass flowmeter 7, and the air outlet of the second connecting pipe 8 is placed outdoors. The environmental parameter recorder is placed outdoors and close to the air outlet of the second connecting pipe 8.
The flange 14 is arranged at the air inlet of the exhaust pipeline 3, the flange 14 is connected with the emptying pipeline of the cryogenic liquid tank container 15, and the air outlet of the exhaust pipeline 15 is placed outdoors.
In the working state, when the cryogenic liquid tank container 15 is vented and left standing, the vent line 3 is used for venting, and when the cryogenic liquid tank container 15 measures the dynamic gas flow, the measuring system is used for measuring the flow of the boil-off gas.
When the exhaust gas of the cryogenic liquid tank container 15 is flammable, explosive or toxic gas, a gas treatment device or a gas recovery device needs to be installed at the gas outlet of the second connection pipe 8 or the gas outlet of the exhaust pipeline 3.
Under the working state, the method for measuring the dynamic evaporation rate of the cryogenic liquid tank container comprises the following steps:
(1) the cryogenic liquid tank container 15 is fixed on the container bracket 1 through the corner fittings and the dovetail locks 4, and the container bracket 1 is fixed on the ship body motion simulation platform 2 through the bolt hole plate 5.
(2) The cryogenic liquid tank container 15 is filled to a nominal fill rate.
(3) After the filling is finished, the exhaust pipeline 3 is installed, the pipeline valve is opened, and the standing is carried out for at least 48 h.
(4) After standing, when the pressure of the inner container of the deep cooling liquid tank container 15 is close to zero, the exhaust pipeline 3 is dismounted, the gas flow test system is installed, data are collected in time which is not more than 10min, and the numerical value, the ambient temperature, the atmospheric pressure, the inlet temperature and the inlet pressure of the gas mass flowmeter 7 are recorded. And standing for at least 24 h.
(5) After standing, checking data of the gas mass flow meter 7 within the latest 2h, and starting the next measurement if the gas mass flow has no obvious mutation; and (4) if the gas flow rate greatly fluctuates, repeating the step (4).
(6) When the dynamic evaporation rate is measured, firstly, the motion parameters (amplitude, frequency and waveform category) corresponding to the test working condition are input into the control system of the ship body motion simulation platform 2, then, the ship body motion simulation platform 2 is started, data are collected in time not more than 10min, the numerical value of the gas mass flowmeter 7, the ambient temperature, the atmospheric pressure, the inlet temperature and the inlet pressure of the flowmeter are recorded, and the recording time is not less than 36 h.
(7) After the measurement is finished, reading the data of the gas mass flowmeter 7, calculating the difference value of the gas accumulated flow value in the latest 24h, and calculating the dynamic evaporation rate according to the following formula:
in the formula α0-measurement of dynamic evaporation rate,%/d;
delta m-24 h accumulated flow valueDifference, m3/d；
n is the gas-liquid volume ratio of the cryogenic liquid;
effective volume m of V-cryogenic liquid tank container3；
Claims (3)
1. A method for measuring the dynamic evaporation rate of a cryogenic liquid tank container is characterized in that the method is realized based on a measuring device, and the measuring device comprises a container bracket (1), a ship motion simulation platform (2), an air flow test system and an exhaust pipeline (3); the gas flow testing system is used for measuring the flow of the evaporation gas of the cryogenic liquid tank container (15), and comprises a first connecting pipe (6), a gas mass flow meter (7), a second connecting pipe (8) and an environmental parameter recorder (9); one end of the first connecting pipe (6) is connected with an emptying pipeline of the cryogenic liquid tank container, and the other end of the first connecting pipe is connected with an air inlet (12) of the gas mass flowmeter (7) through a reducer pipe (11); the air inlet of the second connecting pipe (8) is connected with the air outlet (13) of the gas mass flowmeter (7), and the air outlet of the second connecting pipe (8) is communicated with the outside; the environment parameter recorder (9) is placed outdoors and is close to the air outlet of the second connecting pipe (8); the air inlet of the exhaust pipeline (3) is connected with the emptying pipeline of the cryogenic liquid tank container, and the air outlet of the exhaust pipeline (3) is communicated with the outside;
under the working state, the method for measuring the dynamic evaporation rate of the cryogenic liquid tank container comprises the following steps:
(1) the cryogenic liquid tank container is fixed on a ship motion simulation platform (2) through a container bracket (1);
(2) filling the cryogenic liquid tank container to a rated filling rate;
(3) after the filling is finished, an exhaust pipeline (3) is installed;
(4) after standing, when the pressure of an inner container meter of the cryogenic liquid tank container is close to zero, the exhaust pipeline (3) is dismounted, a gas flow test system is installed, data are collected in time not more than 10min, and the numerical value, the ambient temperature, the atmospheric pressure, the inlet temperature and the inlet pressure of the gas mass flowmeter are recorded; standing for at least 24 h;
(5) after standing, checking data in the latest 2h of the gas mass flow meter (7), and starting the next measurement if the gas mass flow has no obvious mutation; if the gas flow fluctuates greatly, repeating the step (4);
(6) when the dynamic evaporation rate is measured, firstly, the motion parameter amplitude, the frequency and the waveform type corresponding to the test working condition are input into a control system of a ship body motion simulation platform (2), then, the ship body motion simulation platform (2) is started, data are collected in time which is not more than 10min, the numerical value, the environment temperature, the atmospheric pressure, the inlet temperature and the inlet pressure of a gas mass flowmeter (7) are recorded, and the recording time is not less than 36 h;
(7) after the measurement is finished, reading the data of the gas mass flowmeter (7), calculating the difference of the gas accumulated flow value in the latest 24h, and calculating the dynamic evaporation rate according to the following formula:
in the formula α0-measurement of dynamic evaporation rate,%/d;
difference of accumulated flow value of delta m-24 h, m3/d；
n is the gas-liquid volume ratio of the cryogenic liquid;
effective volume m of V-cryogenic liquid tank container3；
2. The method for measuring the dynamic evaporation rate of a cryogenic liquid tank container according to claim 1, wherein when the exhaust gas of the cryogenic liquid tank container is flammable, explosive or toxic gas, a gas processing device or a gas recovery device is further installed at the gas outlet of the second connection pipe (8) or the gas outlet of the exhaust pipeline (3).
3. A method for measuring the dynamic evaporation rate of a cryogenic liquid tank container according to claim 1 or 2, characterized in that the first connecting pipe (6), the second connecting pipe (8) and the exhaust pipe (3) are all corrugated pipes which do not react with the measured gas.
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| CN109373178B (en) * | 2018-11-12 | 2020-01-31 | 西安交通大学 | Low-temperature liquid filling method and system for detecting evaporation rate of low-temperature heat-insulation gas cylinder |
| CN110107806B (en) * | 2019-03-27 | 2020-09-29 | 广东省特种设备检测研究院东莞检测院 | Low-temperature heat-insulation gas cylinder evaporation rate detection method based on different filling rates |
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