CN218211510U - High-precision liquid level detection device for cryogenic tank - Google Patents
High-precision liquid level detection device for cryogenic tank Download PDFInfo
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- CN218211510U CN218211510U CN202222169302.4U CN202222169302U CN218211510U CN 218211510 U CN218211510 U CN 218211510U CN 202222169302 U CN202222169302 U CN 202222169302U CN 218211510 U CN218211510 U CN 218211510U
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- Y02E60/30—Hydrogen technology
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Abstract
The utility model discloses a high accuracy detection device of cryogenic tank liquid level, valve, density lower valve on level gauge, cryogenic tank, gaseous phase valve, liquid phase valve, density. The differential pressure of two fixed liquid sites a and b of the low-temperature storage tank, which is detected by a first differential pressure sensor S1 of the middle liquid level meter L, can calculate the actual low-temperature liquid density so as to correct the liquid level calculation error caused by the change of the low-temperature liquid density along with the change of the working pressure; the distance between the surface d of the bottom of the inner container and the liquid sealing point c can be calculated by the differential pressure between a fixed liquid position a of the cryogenic storage tank and the liquid sealing point c detected by a second differential pressure sensor S2 of the liquid level meter L so as to ensure that the liquid level H is the height from the liquid level to the surface d of the bottom of the inner container. The utility model provides an inaccurate shortcoming of present level gauge measurement, improved the measurement accuracy of cryogenic liquids liquid level, satisfied the customer to the increasingly high measurement requirement of liquid level of cryogenic tank liquid.
Description
Technical Field
The utility model relates to a liquid level high accuracy detection device in low temperature storage tank.
Background
The cryogenic tank is a pressure vessel for containing cryogenic liquids such as liquid nitrogen, liquid oxygen, liquid argon, liquid hydrogen, liquid helium, liquid carbon dioxide, liquefied natural gas and the like, the density of the cryogenic liquid changes along with the change of the pressure of the cryogenic tank, the pressure of the cryogenic tank is not saturated vapor pressure, the density of the cryogenic liquid cannot be corrected by detecting the pressure of the cryogenic tank, and the cryogenic liquid such as LNG can cause different densities due to different components; the liquid level detection principle of the traditional differential pressure type liquid level meter is calculated by the detected differential pressure and the set density, the pressure of the low-temperature storage tank is not constant, so the density is a variable, and the calculated liquid level is inaccurate; meanwhile, a liquid phase end pressure guiding pipe of the inner container of the cryogenic storage tank is provided with a liquid seal point, and due to the reasons of manufacturing process and the like, the position of the liquid seal point is a fixed value which is difficult to guarantee to be known, and the fixed value is possibly lower than the bottom of the inner container of the cryogenic storage tank and is also possibly higher than the bottom of the inner container of the cryogenic storage tank, liquid exists from the bottom of the inner container of the cryogenic storage tank, and the liquid level of the section of liquid level can generate differential pressure to bring errors.
Disclosure of Invention
The utility model aims at solving the above problems and providing a high-precision detection device for the liquid level of a cryogenic tank.
The technical scheme of the utility model as follows:
low temperature storage tank liquid level high accuracy detection device, characterized by: comprises a liquid level meter L, a low-temperature storage tank (2), a gas phase valve V1, a liquid phase valve V4, a density upper valve V2 and a density lower valve V3;
a first differential pressure sensor S1, a second differential pressure sensor S2 and a third differential pressure sensor S3 are arranged in the liquid level meter L;
a third differential pressure sensor S3 of the liquid level meter L is respectively connected with a gas phase valve V1 and a liquid phase valve V4 through pressure leading pipes, the gas phase valve V1 is connected to a gas phase end (10) of the low-temperature storage tank (2) through the pressure leading pipes, the liquid phase valve V4 is connected to a liquid phase end (11) of the low-temperature storage tank (2) through the pressure leading pipes, and the third differential pressure sensor S3 is used for measuring the differential pressure from the liquid level to a liquid sealing point c to calculate the liquid level height h3;
a first differential pressure sensor S1 of the liquid level meter L is respectively connected with an upper density valve V2 and a lower density valve V3 through pressure leading pipes, the upper density valve V2 is connected to an upper density valve pressure leading end (12) of the low-temperature storage tank (2) through the pressure leading pipes, the lower density valve V3 is connected to a lower density valve pressure leading end (13) of the low-temperature storage tank (2) through the pressure leading pipes, and the first differential pressure sensor S1 is used for measuring the differential pressure of a point a and a point b of the liquid to calculate the actual density of the liquid;
a second differential pressure sensor S2 of the liquid level meter L is respectively connected with the density upper valve V2 and the liquid phase valve V4 through pressure guiding pipes, and the second differential pressure sensor S2 is used for measuring the differential pressure of the liquid a point and the point c to calculate the liquid level height h5 from the bottom d of the inner container to the liquid sealing point c;
the position of a point a connected with the density upper valve pressure leading end (12) and the position of a point b connected with the density lower valve pressure leading end (13) are between the allowed maximum liquid level and the bottom d of the inner container, and the maximum filling rate of the liquid in the low-temperature storage tank is 90-95% of the geometric volume of the inner container for different media;
the point a is a pressure leading point of the density upper valve, the pressure leading end (12) of the density upper valve corresponds to the inner container of the low-temperature storage tank (2), the point b is a pressure leading point of the density lower valve, the pressure leading end (13) of the density lower valve corresponds to the inner container of the low-temperature storage tank (2), the point c is a liquid-phase liquid sealing point of the low-temperature storage tank (2), liquid is in a pressure leading pipe between the point c and the inner container, gas is in the pressure leading pipe between the point c and the liquid-phase end (11), and the point d is the bottom of the inner container of the low-temperature storage tank (2).
The high-precision detection device for the liquid level of the cryogenic tank is characterized in that: the liquid level meter comprises three differential pressure transmitters and a data acquisition device.
The high-precision detection device for the liquid level of the cryogenic tank is characterized in that: the shape of the low-temperature storage tank (2) is cylindrical, spherical or square with or without a seal head.
The high-precision detection device for the liquid level of the low-temperature storage tank is characterized in that: the low-temperature storage tank (2) is in a horizontal type and a vertical type.
The working principle of the high-precision detection device for the liquid level of the low-temperature storage tank is as follows:
the first step is as follows: a first differential pressure sensor S1 of a liquid level meter L detects a differential pressure delta P1 between a point a and a point b of liquid in a low-temperature storage tank (2), the density of the low-temperature liquid is calculated as rho through a formula (1), h1 is a fixed value provided by a storage tank manufacturer when the storage tank manufacturer leaves a factory,
ρ＝ΔP1/h1………………(1)
in the formula
ρ represents the density of the cryogenic liquid
Δ P1 represents a differential pressure value between two points a and b of the liquid
h1 represents the height between the points a and b;
the second step is that: a second differential pressure sensor S2 of the liquid level meter L detects the differential pressure delta P2 between a point a and a point c of liquid in the cryogenic storage tank (2), h2 is calculated through the formula (2), the height h5 from the bottom d of an inner container of the cryogenic storage tank (2) to a liquid sealing point c is calculated through the formula (3), h4 is a fixed value provided by a storage tank manufacturer when the storage tank is delivered,
h2＝ΔP2/ρ………………(2)
h5＝h2-h4………………(3)
in the formula
ρ represents the density of the cryogenic liquid
Δ P2 represents a differential pressure value between the two points a and c of the liquid
h2 represents the height between the points a and c
h4 represents the height between the point a and the bottom d of the inner container of the low-temperature storage tank
h5 represents the height between the points d and c at the bottom of the inner container of the low-temperature storage tank;
the third step: a third differential pressure sensor S3 of the liquid level meter L detects a differential pressure delta P3 from the liquid level of the liquid in the low-temperature storage tank (2) to a liquid sealing point c, H3 is calculated by a formula (4), an actual liquid level H of the liquid contained in the inner container of the low-temperature storage tank (2) is calculated by a formula (5),
h3＝ΔP3/ρ………………(4)
H＝h3-h5…………………(5)
in the formula (I), the compound is shown in the specification,
ρ represents the density of the cryogenic liquid
Δ P3 represents a differential pressure value between the liquid level of the liquid and the point c
h3 represents the height between the liquid level and the point c
h5 represents the height between points d and c of the bottom of the inner container of the cryogenic storage tank
H represents the actual liquid level height of the liquid contained in the inner container of the cryogenic tank.
The advantages and effects are as follows:
1. the liquid level that the traditional differential pressure type level gauge shows is that the differential pressure that detects and the fixed density that sets up calculate, the utility model discloses the differential pressure of two fixed liquid position points a of cryogenic tank that the first differential pressure sensor S1 of well level gauge L detected can calculate actual cryogenic liquid density, corrects the liquid level calculation error that cryogenic liquid density changes and brings along with the working pressure change;
2. the liquid level that traditional differential pressure formula level gauge shows is the liquid level that the differential pressure that the liquid produced in the pressure tube that contains inner bag bottom d to liquid seal point c brings, the utility model discloses the differential pressure that a fixed liquid position point a of low temperature storage tank that the second differential pressure transducer S2 of level gauge L detected reaches liquid seal point c can calculate the distance between inner bag bottom d face and liquid seal point c and guarantee that liquid level H is the height of liquid level to inner bag bottom d face, has improved the measurement accuracy of low temperature liquid level H;
3. the utility model discloses satisfied the customer and to the increasingly high measurement requirement of liquid level of cryogenic tank liquid, especially passed through liquid level height to horizontal storage tank and spherical tank and calculated accurate liquid volume and liquid weight and have great meaning.
In the high-precision detection device for the liquid level of the cryogenic tank, the actual cryogenic liquid density can be calculated by the differential pressure of two fixed liquid points a and b of the cryogenic tank (2) detected by a first differential pressure sensor S1 of a liquid level meter L so as to correct the liquid level calculation error caused by the change of the cryogenic liquid density along with the change of working pressure; the differential pressure from a fixed liquid position point a to a liquid sealing point c of the low-temperature storage tank (2) detected by a second differential pressure sensor S2 of the liquid level meter L can calculate the error generated by the liquid level H5 from the bottom d surface of the inner container to the liquid sealing point c, so as to ensure that the liquid level H is the height from the liquid level to the bottom d surface of the inner container.
And a data acquisition processing unit and a display unit for the first differential pressure sensor S1, the second differential pressure sensor S2 and the third differential pressure sensor S3 are arranged in the liquid level meter L.
Drawings
Fig. 1 is a schematic diagram of a high-precision detection device for the liquid level of a cryogenic tank.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
Fig. 1 shows a schematic diagram of a high-precision detection device for the liquid level of a cryogenic tank provided by the present invention, which comprises a liquid level meter L, a cryogenic tank (2), a gas phase valve V1, a liquid phase valve V4, an upper density valve V2, and a lower density valve V3;
a first differential pressure sensor S1, a second differential pressure sensor S2 and a third differential pressure sensor S3 are arranged in the liquid level meter L;
a third differential pressure sensor S3 of the liquid level meter L is respectively connected with a gas phase valve V1 and a liquid phase valve V4 through pressure introduction pipes, the gas phase valve V1 is connected to a gas phase end (10) of the low-temperature storage tank (2) through the pressure introduction pipes, the liquid phase valve V4 is connected to a liquid phase end (11) of the low-temperature storage tank (2) through the pressure introduction pipes, and the third differential pressure sensor S3 is used for measuring the differential pressure from the liquid level to a liquid seal point c to calculate the liquid level height h3;
a first differential pressure sensor S1 of the liquid level meter L is respectively connected with an upper density valve V2 and a lower density valve V3 through pressure leading pipes, the upper density valve V2 is connected to an upper density valve pressure leading end (12) of the low-temperature storage tank (2) through the pressure leading pipes, the lower density valve V3 is connected to a lower density valve pressure leading end (13) of the low-temperature storage tank (2) through the pressure leading pipes, and the first differential pressure sensor S1 is used for measuring the differential pressure of a point a and a point b of the liquid to calculate the actual density of the liquid;
a second differential pressure sensor S2 of the liquid level meter L is respectively connected with the density upper valve V2 and the liquid phase valve V4 through pressure guiding pipes, and the second differential pressure sensor S2 is used for measuring the differential pressure of the liquid a point and the point c to calculate the liquid level height h5 from the bottom d of the inner container to the liquid sealing point c;
the position of a point a connected with the density upper valve pressure guiding end (12) and a point b connected with the density lower valve pressure guiding end (13) is between the allowed maximum liquid level and the bottom d of the inner container, and for different media, the maximum filling rate of the liquid in the low-temperature storage tank is 90-95% of the geometric volume of the inner container;
the point a is a pressure leading point of the density upper valve pressure leading end (12) corresponding to the inner container of the low-temperature storage tank (2), the point b is a pressure leading point of the density lower valve pressure leading end (13) corresponding to the inner container of the low-temperature storage tank (2), the point c is a liquid phase liquid sealing point of the low-temperature storage tank (2), liquid is in a pressure leading pipe between the point c and the inner container, gas is in the pressure leading pipe between the point c and the liquid phase end (11), and the point d is the bottom of the inner container of the low-temperature storage tank (2).
The high-precision detection device for the liquid level of the low-temperature storage tank is characterized in that: the liquid level meter comprises three differential pressure transmitters and a data acquisition device.
The high-precision detection device for the liquid level of the cryogenic tank is characterized in that: the shape of the low-temperature storage tank (2) is cylindrical, spherical or square with or without a seal head.
The high-precision detection device for the liquid level of the low-temperature storage tank is characterized in that: the low-temperature storage tank (2) is in a horizontal type and a vertical type.
The working principle of the high-precision detection device for the liquid level of the low-temperature storage tank is as follows:
the first step is as follows: a first differential pressure sensor S1 of a liquid level meter L detects a differential pressure delta P1 between two points a and b of liquid in a low-temperature storage tank (2), the density of the low-temperature liquid is calculated as rho through a formula (1), h1 is a fixed value provided by a storage tank manufacturer when the storage tank manufacturer leaves a factory,
ρ＝ΔP1/h1………………(1)
in the formula
ρ represents the density of the cryogenic liquid
Δ P1 represents a differential pressure value between two points a and b of the liquid
h1 represents the height between the points a and b;
the second step: a second differential pressure sensor S2 of the liquid level meter L detects the differential pressure delta P2 between the two points a and c of the liquid in the low-temperature storage tank (2), h2 is calculated by the formula (2), the height h5 from the bottom d of the inner container of the low-temperature storage tank (2) to the liquid sealing point c is calculated by the formula (3), h4 is a fixed value provided by a storage tank manufacturer when the storage tank is delivered,
h2＝ΔP2/ρ………………(2)
h5＝h2-h4………………(3)
in the formula
ρ represents the density of the cryogenic liquid
Δ P2 represents a differential pressure value between two points a and c of the liquid
h2 represents the height between points a and c
h4 represents the height between the point a and the bottom d of the inner container of the low-temperature storage tank
h5 represents the height between the points d and c at the bottom of the inner container of the low-temperature storage tank;
the third step: a third differential pressure sensor S3 of the liquid level meter L detects a differential pressure delta P3 from the liquid level of the liquid in the low-temperature storage tank (2) to a liquid sealing point c, H3 is calculated by a formula (4), an actual liquid level H of the liquid contained in the inner container of the low-temperature storage tank (2) is calculated by a formula (5),
h3＝ΔP3/ρ………………(4)
H＝h3-h5…………………(5)
in the formula (I), the compound is shown in the specification,
ρ represents the density of the cryogenic liquid
Δ P3 represents a differential pressure value between the liquid level and the point c
h3 represents the height between the liquid level and the point c
h5 represents the height between the points d and c at the bottom of the inner container of the cryogenic tank
H represents the actual liquid level height of the liquid contained in the inner container of the cryogenic storage tank.
Along with the scientific and technical progress and the occasion of application are different, the utility model discloses can have various changes, for example the low temperature liquid density signal that the level gauge detected and calculated can be transmitted to and improve flowmeter precision etc. in the liquid feeding flowmeter. All modifications made within the spirit and principle of the present invention are within the scope of the present invention.
Claims (4)
1. Low temperature storage tank liquid level high accuracy detection device, characterized by: comprises a liquid level meter L, a cryogenic storage tank (2), a gas phase valve V1, a liquid phase valve V4, a density upper valve V2 and a density lower valve V3;
a first differential pressure sensor S1, a second differential pressure sensor S2 and a third differential pressure sensor S3 are arranged in the liquid level meter L;
a third differential pressure sensor S3 of the liquid level meter L is respectively connected with a gas phase valve V1 and a liquid phase valve V4 through pressure leading pipes, the gas phase valve V1 is connected to a gas phase end (10) of the low-temperature storage tank (2) through the pressure leading pipes, the liquid phase valve V4 is connected to a liquid phase end (11) of the low-temperature storage tank (2) through the pressure leading pipes, and the third differential pressure sensor S3 is used for measuring the differential pressure from the liquid level to a liquid sealing point c to calculate the liquid level height h3;
a first differential pressure sensor S1 of the liquid level meter L is respectively connected with an upper density valve V2 and a lower density valve V3 through pressure leading pipes, the upper density valve V2 is connected to an upper density valve pressure leading end (12) of the low-temperature storage tank (2) through the pressure leading pipes, the lower density valve V3 is connected to a lower density valve pressure leading end (13) of the low-temperature storage tank (2) through the pressure leading pipes, and the first differential pressure sensor S1 is used for measuring the differential pressure of a point a and a point b of the liquid to calculate the actual density of the liquid;
a second differential pressure sensor S2 of the liquid level meter L is respectively connected with the density upper valve V2 and the liquid phase valve V4 through pressure guiding pipes, and the second differential pressure sensor S2 is used for measuring the differential pressure of the liquid a point and the point c to calculate the liquid level height h5 from the bottom d of the inner container to the liquid sealing point c;
the position of a point a connected with the density upper valve pressure leading end (12) and the position of a point b connected with the density lower valve pressure leading end (13) are between the allowed maximum liquid level and the bottom d of the inner container, and the maximum filling rate of the liquid in the low-temperature storage tank is 90-95% of the geometric volume of the inner container for different media;
the point a is a pressure leading point of the density upper valve pressure leading end (12) corresponding to the inner container of the low-temperature storage tank (2), the point b is a pressure leading point of the density lower valve pressure leading end (13) corresponding to the inner container of the low-temperature storage tank (2), the point c is a liquid phase liquid sealing point of the low-temperature storage tank (2), liquid is in a pressure leading pipe between the point c and the inner container, gas is in the pressure leading pipe between the point c and the liquid phase end (11), and the point d is the bottom of the inner container of the low-temperature storage tank (2).
2. The cryogenic tank liquid level high accuracy detection device of claim 1, wherein: the liquid level meter comprises three differential pressure transmitters and a data acquisition device.
3. The cryogenic tank liquid level high accuracy detection device of claim 1, wherein: the shape of the low-temperature storage tank (2) is cylindrical, spherical or square with or without a seal head.
4. The cryogenic tank liquid level high accuracy detection device of claim 1, wherein: the low-temperature storage tank (2) is in a horizontal type and a vertical type.
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| CN202222169302.4U CN218211510U (en) | 2022-08-17 | 2022-08-17 | High-precision liquid level detection device for cryogenic tank |
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|---|---|---|---|
| CN202222169302.4U CN218211510U (en) | 2022-08-17 | 2022-08-17 | High-precision liquid level detection device for cryogenic tank |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116626566A (en) * | 2023-07-25 | 2023-08-22 | 北京中科富海低温科技有限公司 | Low-temperature experiment system, liquid level measurement method and rewarming method of low-temperature experiment system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116626566A (en) * | 2023-07-25 | 2023-08-22 | 北京中科富海低温科技有限公司 | Low-temperature experiment system, liquid level measurement method and rewarming method of low-temperature experiment system |
| CN116626566B (en) * | 2023-07-25 | 2023-09-22 | 北京中科富海低温科技有限公司 | Low-temperature experiment system, liquid level measurement method and rewarming method of low-temperature experiment system |
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