CN112665682B - High-temperature high-pressure container liquid level measuring system under marine environment - Google Patents
High-temperature high-pressure container liquid level measuring system under marine environment Download PDFInfo
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- CN112665682B CN112665682B CN202011490784.2A CN202011490784A CN112665682B CN 112665682 B CN112665682 B CN 112665682B CN 202011490784 A CN202011490784 A CN 202011490784A CN 112665682 B CN112665682 B CN 112665682B
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Abstract
The invention discloses a liquid level measuring system of a high-temperature high-pressure container in a marine environment, which comprises: the liquid level measuring device measures the liquid level of the high-temperature high-pressure container by using the first differential pressure transmitter and outputs a liquid level measuring signal; the liquid level measurement error correction device measures the pressure of the correction liquid in a static state in advance by using the second differential pressure transmitter, and synchronously measures the real-time pressure of the correction liquid by using the second differential pressure transmitter when the first differential pressure transmitter measures the liquid level of the high-temperature high-pressure container, and outputs a liquid level correction signal; a signal acquisition device; and the processing and calculating unit is used for correcting the liquid level measurement signal by taking the ratio of the pressure of the correction liquid in a static state to the real-time pressure as a liquid level correction coefficient, and calculating the real liquid level value of the liquid in the high-temperature high-pressure container. The invention can eliminate the measurement error caused by the inclination angle of the ship body, the change of the gravity acceleration and the installation distance of the measuring instrument, and realize the liquid level measurement of various regular-shaped high-temperature high-pressure containers under the sea condition.
Description
Technical Field
The invention belongs to the field of liquid level measurement in marine environment, and particularly relates to a high-temperature high-pressure container liquid level measurement system in marine environment.
Background
Under the marine environment, a ship or an offshore platform inclines and swings, so that liquid level measurement in the ship or the offshore platform is difficult for a long time, and great problems are brought to liquid level monitoring and process control.
The existing marine environment liquid level measurement methods mainly comprise a double reference pipe method and a guided wave radar liquid level meter measurement method.
The double-reference-pipe method is that 2 balance containers are designed in a tested container, although the measurement precision is high, the 2 balance containers are required to be installed at the center of the container, the installation is complex, the balance is difficult, a water replenishing device is required to be arranged, and otherwise, new errors can be introduced; the measuring mode is more suitable for a thin and high-type container, is not suitable for a large washbasin type container with a small liquid level, and the balance container is easy to be thermally shocked and is not suitable for measuring the liquid level of a high-temperature and high-pressure container.
Although the guided wave radar liquid level meter has higher precision, the guided wave radar liquid level meter can be installed in the center of a container to eliminate errors in an inclined state, the thickness of water vapor in a high-temperature high-pressure container can influence the transmission speed of the guided wave radar to bring measurement errors, and radar waves cannot penetrate through a vapor layer of more than 500mm, so that the guided wave radar liquid level meter is not suitable for liquid level measurement of large-scale high-temperature high-pressure containers. In addition, the guided wave radar level gauge installed at the center of the container is inconvenient to overhaul and difficult to maintain once it fails.
Therefore, the measurement methods have certain conditions and limitations, and cannot solve the liquid level measurement of the high-temperature high-pressure container in the marine environment.
In view of the above, it is necessary to provide a system for measuring the liquid level of a high-temperature high-pressure container in a marine environment, which can solve the above problems.
Disclosure of Invention
The invention aims to: the high-temperature high-pressure container liquid level measurement system under the marine environment is simple, reliable and high in precision, and solves the problem that the marine environment inclines and swings to measure the liquid level of the high-temperature high-pressure container.
In order to achieve the above object, the present invention provides a system for measuring a liquid level of a high-temperature high-pressure container in a marine environment, comprising:
the liquid level measuring device measures the liquid level of the high-temperature high-pressure container by using the first differential pressure transmitter and outputs a liquid level measuring signal; the position of the first differential pressure transmitter is lower than that of the high-temperature high-pressure container, a high-pressure side instrument tube of the first differential pressure transmitter is connected to the bottom center of the inner side of the high-temperature high-pressure container for pressure measurement, a low-pressure side instrument tube of the first differential pressure transmitter is connected with a liquid collector positioned at the center of the topmost part of the inner side of the high-temperature high-pressure container for pressure measurement, and the liquid collector is in a full water state;
the liquid level measurement error correction device measures the pressure of the correction liquid in a static state in advance by using the second differential pressure transmitter, and synchronously measures the real-time pressure of the correction liquid by using the second differential pressure transmitter and outputs a liquid level correction signal when the liquid level measurement device measures the liquid level of the high-temperature high-pressure container by using the first differential pressure transmitter;
the signal acquisition device is connected with the first differential pressure transmitter and the second differential pressure transmitter and is used for acquiring a liquid level measurement signal of the first differential pressure transmitter and a liquid level correction signal of the second differential pressure transmitter; and
and the processing and calculating unit is connected with the signal acquisition device, takes the ratio of the pressure of the liquid in a static state to the real-time pressure as a liquid level correction coefficient of the inclination angle and the gravity acceleration change of the ship body, corrects the liquid level measurement signal by using the liquid level correction coefficient, and calculates to obtain the real liquid level value of the liquid in the high-temperature high-pressure container.
As an improvement of the system for measuring the liquid level of the high-temperature high-pressure container in the marine environment, the system for measuring the liquid level of the high-temperature high-pressure container in the marine environment further comprises:
and the signal output unit is connected with the processing and calculating unit and is used for outputting the true liquid level value of the liquid in the high-temperature and high-pressure container calculated by the processing and calculating unit outwards.
As an improvement of the liquid level measuring system of the high-temperature high-pressure container in the marine environment, the liquid level measuring error correcting device comprises a liquid collecting container, a pressure guide pipe and a second differential pressure transmitter; the pressure guide pipe is connected with the liquid collection container; the second differential pressure transmitter is positioned right below the liquid collecting container, so that the central point of the liquid collecting container and the central point of the second differential pressure transmitter are on the same vertical line; the high pressure side of the second differential pressure transmitter is connected with the pressure guide pipe, and the low pressure side of the second differential pressure transmitter is connected with the atmosphere.
As an improvement of the liquid level measuring system of the high-temperature high-pressure container in the marine environment, the formula for calculating the real liquid level value h of the liquid in the high-temperature high-pressure container by the processing and calculating unit is as follows:
in the formula, H is the height difference between the pressure taking point at the top of the first differential pressure transmitter and the level of the liquid level bottom of the high-temperature high-pressure container; delta P is the pressure value corresponding to the liquid level measurement signal output by the first differential pressure transmitter, P 10 Is the pressure measurement value, rho, of the second differential pressure transmitter in a static state 2 Is the density of the liquid in the high-temperature high-pressure container, rho 3 The density of the gas space medium in the high-temperature high-pressure container is shown, g is the gravity acceleration, and P' is the pressure measurement value corresponding to the liquid level correction signal output by the second differential pressure transmitter.
As an improvement of the high-temperature high-pressure container liquid level measuring system in the marine environment, rho 3 、ρ 2 For measuring liquid levelTime density, rho if the working temperature and working pressure of the medium in the high-temperature high-pressure container are not changed 3 、ρ 2 The constant is directly substituted into a formula for calculation; if the working temperature and the working pressure of the medium in the high-temperature high-pressure container have large changes, the real-time density rho of the gas space medium and the liquid in the high-temperature high-pressure container is calculated according to the temperature and pressure relationship 3 、ρ 2 Then the real-time density rho is measured 3 、ρ 2 And substituting into a formula for calculation.
As an improvement of the high-temperature high-pressure container liquid level measuring system in the marine environment, the signal acquisition device adopts the same plate card to realize the acquisition of a liquid level measuring signal of the first differential pressure transmitter and a liquid level correcting signal of the second differential pressure transmitter, and the synchronism of the two signals is effectively ensured.
As an improvement of the liquid level measuring system of the high-temperature high-pressure container in the marine environment, the cross section area of the liquid collecting container is the same as that of the pressure guide pipe.
As an improvement of the liquid level measuring system of the high-temperature high-pressure container in the marine environment, the liquid in the liquid level measuring error correcting device is consistent with the liquid in the instrument tube of the liquid level measuring device.
As an improvement of the liquid level measuring system of the high-temperature high-pressure container in the marine environment, the top of the liquid collecting container is provided with a liquid supplementing port with a plug; the liquid collecting container is in an unfilled state, and a free space for absorbing expansion with heat and contraction with cold of liquid in the pressure guide pipe and the liquid collecting container is reserved.
As an improvement of the liquid level measuring system of the high-temperature high-pressure container in the marine environment, a plurality of layers of filter screens for inhibiting liquid from shaking are arranged in the liquid collecting container.
Compared with the prior art, the liquid level measuring system of the high-temperature and high-pressure container in the marine environment corrects the liquid level measuring signal of the high-temperature and high-pressure container by using the liquid level correcting signal of the liquid level measuring error correcting device, can thoroughly eliminate the measuring error of the liquid level in the high-temperature and high-pressure container caused by the inclination angle of the ship body, the change of the gravity acceleration and the installation distance L of the measuring instrument, can realize the liquid level measurement of the high-temperature and high-pressure container with various regular shapes on the facilities such as ships, marine platforms and the like under the severe accident sea conditions (large inclination angle and swing amplitude), and is particularly suitable for the liquid level measurement of the large-scale high-temperature and high-pressure container.
Drawings
The liquid level measuring system for the high-temperature high-pressure container in the marine environment of the invention is described in detail below with reference to the accompanying drawings and the specific embodiments.
FIG. 1 is a schematic structural diagram of a high-temperature high-pressure container liquid level measuring system in a marine environment.
Fig. 2 is a schematic structural view of the liquid level measuring device in fig. 1.
FIG. 3 is a schematic structural diagram of the liquid level measurement error correction apparatus of FIG. 1.
Detailed Description
In order to make the objects, technical solutions and advantageous technical effects of the present invention clearer, the present invention is further described in detail below with reference to the accompanying drawings and the detailed description. It should be understood that the detailed description and specific examples, while indicating the preferred embodiment of the invention, are intended for purposes of illustration only and are not intended to limit the scope of the invention.
Referring to fig. 1, the system for measuring the liquid level of a high-temperature high-pressure container in a marine environment according to the present invention comprises:
a liquid level measuring device 20 for measuring the liquid level of the high temperature and high pressure vessel by using a first differential pressure transmitter and outputting a liquid level measuring signal;
a liquid level measurement error correction device 10 for measuring the pressure of the correction liquid in a static state in advance by using a second differential pressure transmitter, and for measuring the real-time pressure of the correction liquid synchronously by using the second differential pressure transmitter and outputting a liquid level correction signal when the liquid level measurement device 20 measures the liquid level of the high-temperature high-pressure vessel by using the first differential pressure transmitter;
the signal acquisition device 30 is connected with the first differential pressure transmitter and the second differential pressure transmitter and is used for acquiring a liquid level measurement signal of the first differential pressure transmitter and a liquid level correction signal of the second differential pressure transmitter; and
and the processing and calculating unit 40 is connected with the signal acquisition device 30 to take the ratio of the pressure of the liquid in a static state to the real-time pressure as a liquid level correction coefficient of the changes of the inclination angle and the gravity acceleration of the ship body, correct the liquid level measurement signal by using the liquid level correction coefficient, and calculate the real liquid level value of the liquid in the high-temperature high-pressure container.
The system for measuring the liquid level of the high-temperature and high-pressure container in the marine environment further comprises a signal output unit 50, wherein the signal output unit 50 is connected with the processing and calculating unit 40 and is used for outputting the actual liquid level value of the liquid in the high-temperature and high-pressure container calculated by the processing and calculating unit 40 outwards.
Referring to fig. 2, the liquid level measuring device 20 includes a first differential pressure transmitter 21, a high pressure side gauge pipe 22, a low pressure side gauge pipe 23, a liquid trap 24, and a high temperature and high pressure vessel 25. Wherein, the position of the first differential pressure transmitter 21 is lower than the high-temperature high-pressure vessel 25; one end of the high-pressure side gauge pipe 22 is connected with the high-pressure side of the first differential pressure transmitter 21, and the other end is connected to the bottom center of the inner side of the high-temperature high-pressure vessel 25 for pressure measurement; one end of a low-pressure side instrument tube 23 is connected with the low-pressure side of the first differential pressure transmitter 21, and the other end of the low-pressure side instrument tube is connected with a liquid collector 24 for pressure measurement; the liquid trap 24 is located at the topmost center inside the high temperature and high pressure vessel 25, and the liquid trap 24 is in a full water state. The first differential pressure transmitter 21 is connected to the signal acquisition device 30, and transmits the liquid level measurement signal to the signal acquisition device 30.
As can be seen from the structure of the liquid level measuring device 20, the low-pressure-side pressure value and the high-pressure-side pressure value of the first differential pressure transmitter 21 are:
P - ＝ρ 1 gg′H1 cos α+ρ 2 gg′H cos α+ρ 1 gg′L sin α sin β+ρ 2 gg′R sin α sin β+P 0 -formula (1);
P + ＝ρ 1 gg′H1 cos α+ρ 2 gg′h cos α+ρ 3 gg′(H-h)cos α+ρ 1 gg′L sin α sin β+ρ 2 gg′R sin α sin β+P 0 -formula (2);
in the formulae (1) and (2), P - Is the low pressure side pressure value, P, of the first differential pressure transmitter 21 + Is the high pressure side pressure value, ρ, of the first differential pressure transmitter 21 1 The density of liquid in the instrument tube outside the high-temperature high-pressure container 25 is rho 2 Is the density, rho, of the liquid in the high-temperature high-pressure vessel 25 3 Is the density of the gas space medium in the high-temperature high-pressure container 25; g is gravity acceleration, g' is a gravity acceleration variable (the numerical value is unknown) caused by the shaking of the ship body, H1 is the height difference between the installation position of the first differential pressure transmitter 21 and the elevation of the liquid level bottom of the high-temperature high-pressure container 25, and H is the height difference between the pressure taking point at the top of the first differential pressure transmitter 21 and the elevation of the liquid level bottom of the high-temperature high-pressure container 25; l is a minimum horizontal distance between the first differential pressure transmitter 21 and the sidewall of the high temperature and high pressure vessel 25; r is a radius of the high temperature and high pressure vessel 25 or a distance from an edge of the high temperature and high pressure vessel 25 to a center of the high temperature and high pressure vessel 25; α is the inclination angle of the hull (the value is unknown), β is the inclination angle of the first differential pressure transmitter 21 with respect to the high-temperature high-pressure vessel 25; h is the true level value of the liquid in the high-temperature high-pressure vessel 25, P 0 Is the pressure of the gas space in the high-temperature high-pressure vessel 25. Therefore, the calculation formula of the pressure value Δ P corresponding to the liquid level measurement signal output by the first differential pressure transmitter 21 is:
ΔP＝P + -P - ＝(ρ 3 -ρ 2 ) gg' (H-H) cos α - -equation (3),
in equation (3), g' cos α is the error caused by the marine environment (large tilt angle and swing amplitude).
If k in the formula (4) is used as the liquid level correction coefficient, the real liquid level value h of the liquid in the high-temperature high-pressure container 25 can be derived according to the formula (3) as follows:
referring to fig. 3, the liquid level measurement error correction apparatus 10 includes a liquid collection container 12, a pressure pipe 11, and a second differential pressure transmitter 13. Wherein, the pressure guide pipe 11 is connected with the liquid collecting container 12; second differential pressure transmitter 13 is located directly below liquid collection vessel 12, ensuring that the center point of liquid collection vessel 12 and the center point of second differential pressure transmitter 13 are on a vertical line. The high-pressure side of second differential pressure transmitter 13 is connected to pressure pipe 11, and the low-pressure side is connected to the atmosphere. The second differential pressure transmitter 13 is connected to the signal acquisition device 30, and transmits the liquid level correction signal to the signal acquisition device 30.
The top of the liquid collecting container 12 is provided with a liquid supplementing port with a plug. The pressure pipe 11 is filled with water to ensure that no air bubbles are present between the pressure pipe 11 and the second differential pressure transmitter 13. The low pressure side of second differential pressure transmitter 13 is connected to the atmosphere by a conduit 130 down to the atmosphere.
From the structure of the liquid level measurement error correction device 10, it can be seen that:
in the stationary state, the pressure measurement value P corresponding to the measurement signal of the second differential pressure transmitter 13 10 Comprises the following steps: p 10 ＝ρ 10 gh 10 ，ρ 10 The density of water in the liquid collecting container 12 and the pressure guide pipe 11, g is the gravity acceleration, h 10 The total height of the water in the liquid collecting container 12 and the pressure guide pipe 11;
when the ship body is inclined, rocked or shaken, the pressure measurement value P' corresponding to the liquid level correction signal of the second differential pressure transmitter 13 is: p' = ρ 10 gg′h 10 cos alpha, alpha is the inclination angle of the ship body, and g' is the gravity acceleration variable caused by the ship body shaking;
from this, the liquid level correction coefficient k is:
provided that the pressure measurement value P at rest is stored in the processing and calculating unit 40 10 After the liquid level correction signal of the second differential pressure transmitter 13 is converted into the pressure measurement value P', the liquid level correction coefficient k is calculated by using the formula (6), and then the pressure value Δ P corresponding to the liquid level measurement signal output by the first differential pressure transmitter 21 and the calculated liquid level correction coefficient k are substituted into the formula (5), so that the real liquid level value h of the high-temperature high-pressure vessel can be calculated.
Of course, formula (6) may be substituted into formula (5)Deducing a formula (7) for calculating the true liquid level value h of the high-temperature high-pressure container, storing the formula (7) in a processing and calculating unit 40, and directly calculating P 10 Substituting the P' and the delta P into a formula (7) to obtain the true liquid level value h of the high-temperature high-pressure container:
in the formula (7), H is the height difference between the pressure sampling point at the top of the first differential pressure transmitter 21 and the liquid level bottom elevation of the high-temperature high-pressure container 25; delta P is a pressure value corresponding to the liquid level measurement signal output by the first differential pressure transmitter 21, P 10 Is a pressure measurement, ρ, of second differential pressure transmitter 13 at rest 2 Is the density, rho, of the liquid in the high-temperature high-pressure vessel 25 3 The density of the gas space medium in the high-temperature high-pressure container 25, g is the gravity acceleration, and P' is the pressure measurement value corresponding to the liquid level correction signal output by the second differential pressure transmitter 13. Rho 3 、ρ 2 For the real-time density in the liquid level measurement, if the working temperature and the working pressure of the medium in the high-temperature high-pressure vessel 25 are not changed, ρ is 3 、ρ 2 Is a constant and is directly substituted into the formula (7) for calculation; if the working temperature and the working pressure of the medium in the high-temperature high-pressure container 25 have large amplitude changes, the real-time density rho of the gas space medium and the liquid in the high-temperature high-pressure container 25 is calculated according to the relation between the temperature and the pressure 3 、ρ 2 Then the real-time density rho is measured 3 、ρ 2 The calculation is performed by substituting into the formula (7).
The invention selects a differential pressure transmitter to measure P 10 The reason for P' is that the differential pressure transmitter can prevent measurement errors caused by changes of atmospheric pressure because the atmospheric pressure at different positions is different when the ship sails on the sea.
The signal acquisition device 30 adopts the same board card to realize the acquisition of the liquid level measurement signal of the liquid level measurement device 20 and the liquid level correction signal of the liquid level measurement error correction device 10, and can effectively ensure the synchronism of the two signals.
As can be seen from the above description, the liquid level measurement system of the high-temperature and high-pressure container in marine environment of the present invention corrects the liquid level measurement signal of the liquid level measurement device 20 by using the liquid level correction signal of the liquid level measurement error correction device 10, can completely eliminate the measurement error caused by the inclination angle of the hull, the variation of the gravity acceleration and the installation distance L of the measurement instrument in the liquid level of the high-temperature and high-pressure container, can realize the liquid level measurement of the high-temperature and high-pressure container with various regular shapes in the facilities such as ships, ocean platforms and the like under the severe accident sea conditions (large inclination angle and swing amplitude), and is particularly suitable for the liquid level measurement of the large-scale high-temperature and high-pressure container.
Because the environmental temperature of the high-temperature high-pressure container liquid level measuring system in the marine environment changes, according to the measuring principle of the invention, the change of the environmental temperature can cause the density change of water, so the pressure measurement value of the second differential pressure transmitter 13 of the liquid level measuring error correcting device 10 also changes after the temperature changes, and the change quantity delta P of the pressure measurement value changes 10 The calculation formula of (2) is as follows:
in the formula (8), S1 is the cross-sectional area of the pressure pipe 11, h11 is the height of the pressure pipe 11, S2 is the cross-sectional area of the liquid collecting container 12, ρ 11 is the density of water at the initial time, and ρ 12 is the density of water after temperature change.
As can be seen from the equation (8), when the temperature rises, the pressure decreases, and the larger the difference between the cross-sectional area S1 of the pressure pipe 11 and the cross-sectional area S2 of the liquid collecting container 12 is, the amount of change Δ P in the pressure measurement value becomes 10 The larger, Δ P only when S1= S2 10 Is 0.
Therefore, in order to avoid measurement errors caused by the difference between the cross-sectional area of the liquid collection container 12 and the cross-sectional area of the pressure pipe 11, the cross-sectional area S2 of the liquid collection container 12 of the present invention is preferably the same as the cross-sectional area S1 of the pressure pipe 11 (if the cross-sectional areas are different, a density change correction coefficient may be given according to equation (8), but the process is relatively complicated because there are many parameters to be determined), and for example, when both cross-sections are circular, it is required that the diameters of both cross-sections are the same. In order to facilitate the installation of the pressure guide pipe 11 and prevent the water in the pressure guide pipe 11 from evaporating, the dimensions of the pressure guide pipe 11 and the liquid collecting container 12 are preferably selected from the range of DN20 to DN50, which is reasonable.
It is easy to understand that because the environmental temperature of the high-temperature high-pressure container liquid level measuring system in the marine environment changes, a certain space needs to be reserved in the liquid collecting container 12 for absorbing the volume change caused by the expansion and contraction of the pressure guide pipe 11 and the water in the liquid collecting container 12. Considering the range of variation of the ambient temperature from 0 ℃ to 99 ℃, the water in the liquid collecting container 12 should not overflow, and the density variation is calculated to cause the variation of the liquid level height in the liquid collecting container 12 12 Comprises the following steps:
where ρ 11=0.999, = ρ 12=0.959,h 10 To calculate the total height of the liquid in the liquid collecting container 12 and the pressure pipe 11, it can be calculated that the liquid collecting container 12 needs to reserve a free space which occupies about 5% of the total height of the liquid in the liquid collecting container 12 and the pressure pipe 11.
As the liquid collecting container 12 is in an unfilled state, although the liquid in the liquid collecting container 12 has small oscillation amplitude with a ship, the liquid collecting container 12 is used as a standard device of a liquid level correction signal, and the liquid level correction signal measuring device is provided with a plurality of layers of filter screens for inhibiting the liquid from oscillating in the liquid collecting container 12, so that the measuring accuracy and the reliability of the liquid level correction signal are improved as much as possible.
It will be readily understood that the level measurement error correction device 10 is only used for determining the level correction factor k, since only two pressure values P are involved in the final calculation formula for the level correction factor k 10 Since P' does not relate to the density of the liquid, the process of deriving the liquid level correction coefficient k is described above by taking the most commonly used water as an example, but the water in the liquid trap 12 and the pressure pipe 11 may be replaced with another liquid. In practical use, in order to ensure that the liquid level correction signal of the liquid level measurement error correction device 10 and the liquid level measurement signal of the liquid level measurement device 20 have the same dynamic characteristics, the type of liquid in the liquid level measurement error correction device 10 should be the same as that of the liquid level measurement deviceThe type of liquid in the instrumentation tubes 22, 23 of 20 remains the same.
Compared with the prior art, the invention has at least the following advantages:
1) The device is suitable for reliable measurement of the liquid level of a regular container with any size at any inclination angle on facilities such as ships, ocean platforms and the like under high-temperature and high-pressure occasions;
2) The principle is easy to understand, and the installation and the debugging are simple;
3) The acquisition of a liquid level measurement signal of the liquid level measurement device 20 and a liquid level correction signal of the liquid level measurement error correction device 10 is realized by adopting the same plate card, the synchronism of the two signals can be effectively ensured, the whole device has stable and reliable performance and low failure rate;
4) Meanwhile, correcting the measurement error caused by the change of the inclination angle and the gravity acceleration;
5) Thoroughly eliminating measurement errors caused by the installation distance L of the measuring instrument;
6) On the premise of not carrying out measurement signal filtering processing, the method can achieve very high measurement precision and improve the instantaneity of the liquid level measurement signal.
Appropriate changes and modifications to the embodiments described above will become apparent to those skilled in the art from the disclosure and teachings of the foregoing description. Therefore, the present invention is not limited to the specific embodiments disclosed and described above, and some modifications and variations of the present invention should fall within the scope of the claims of the present invention. Furthermore, although specific terms are employed herein, they are used in a generic and descriptive sense only and not for purposes of limitation.
Claims (8)
1. A high temperature and high pressure container liquid level measurement system under marine environment, characterized by comprising:
the liquid level measuring device measures the liquid level of the high-temperature high-pressure container by using the first differential pressure transmitter and outputs a liquid level measuring signal; the position of the first differential pressure transmitter is lower than that of the high-temperature high-pressure container, a high-pressure side instrument tube of the first differential pressure transmitter is connected to the bottom center of the inner side of the high-temperature high-pressure container for taking pressure, a low-pressure side instrument tube of the first differential pressure transmitter is connected with a liquid collector positioned at the center of the topmost part of the inner side of the high-temperature high-pressure container for taking pressure, and the liquid collector is in a full water state;
the liquid level measurement error correction device comprises a liquid collection container, a pressure guide pipe and a second differential pressure transmitter; the pressure guide pipe is connected with the liquid collecting container; the second differential pressure transmitter is positioned under the liquid collecting container, so that the central point of the liquid collecting container and the central point of the second differential pressure transmitter are on the same vertical line; the high-pressure side of the second differential pressure transmitter is connected with the pressure guide pipe, and the low-pressure side of the second differential pressure transmitter is connected with the atmosphere; the liquid level measurement error correction device measures the pressure of the correction liquid in a static state in advance by using a second differential pressure transmitter, and synchronously measures the real-time pressure of the correction liquid by using the second differential pressure transmitter and outputs a liquid level correction signal when the liquid level measurement device measures the liquid level of the high-temperature high-pressure container by using a first differential pressure transmitter;
the signal acquisition device is connected with the first differential pressure transmitter and the second differential pressure transmitter and is used for acquiring a liquid level measurement signal of the first differential pressure transmitter and a liquid level correction signal of the second differential pressure transmitter; and
the processing and calculating unit is connected with the signal acquisition device, takes the ratio of the pressure of the liquid in a static state to the real-time pressure as a liquid level correction coefficient of the inclination angle and the gravity acceleration change of the ship body, corrects the liquid level measurement signal by using the liquid level correction coefficient, and calculates the real liquid level value of the liquid in the high-temperature high-pressure container; the formula for calculating the real liquid level value h of the liquid in the high-temperature high-pressure container by the processing and calculating unit is as follows:
in the formula, H is the height difference between the pressure taking point at the top of the first differential pressure transmitter and the level of the liquid level bottom of the high-temperature high-pressure container; delta P is the pressure value corresponding to the liquid level measurement signal output by the first differential pressure transmitter, P 10 Is the pressure measurement value, rho, of the second differential pressure transmitter in a static state 2 Is the density of the liquid in the high-temperature high-pressure container, rho 3 At high temperature and high pressureAnd the density of the medium in the gas space in the container, g is the gravity acceleration, and P' is a pressure measurement value corresponding to the liquid level correction signal output by the second differential pressure transmitter.
2. The system of claim 1, further comprising:
and the signal output unit is connected with the processing and calculating unit and is used for outputting the true liquid level value of the liquid in the high-temperature and high-pressure container calculated by the processing and calculating unit outwards.
3. The system for measuring the liquid level of the high-temperature and high-pressure container in the marine environment as claimed in claim 1, wherein ρ is 3 、ρ 2 For the real-time density during liquid level measurement, if the working temperature and the working pressure of the medium in the high-temperature high-pressure container are not changed, the rho value 3 、ρ 2 The constant is directly substituted into a formula for calculation; if the working temperature and the working pressure of the medium in the high-temperature high-pressure container have large changes, the real-time density rho of the gas space medium and the liquid in the high-temperature high-pressure container is calculated according to the temperature and pressure relationship 3 、ρ 2 Then the real-time density rho is measured 3 、ρ 2 And substituting into a formula for calculation.
4. The system for measuring the liquid level of the high-temperature and high-pressure container in the marine environment according to claim 1, wherein the signal acquisition device adopts the same board card to acquire the liquid level measurement signal of the first differential pressure transmitter and the liquid level correction signal of the second differential pressure transmitter, so that the synchronism of the two signals is effectively ensured.
5. The system for measuring the liquid level of the high-temperature and high-pressure container in the marine environment as claimed in claim 1, wherein the cross-sectional area of the liquid collecting container is the same as that of the pressure guiding pipe.
6. The system of claim 1, wherein the liquid level measurement error correction device is configured to correct the liquid level measurement error of the high temperature and high pressure vessel.
7. The system for measuring the liquid level of the high-temperature and high-pressure container in the marine environment as claimed in claim 1, wherein a liquid supplementing port with a plug is arranged at the top of the liquid collecting container; the liquid collecting container is in an unfilled state, and a free space for absorbing expansion with heat and contraction with cold of liquid in the pressure guide pipe and the liquid collecting container is reserved.
8. The system for measuring the liquid level of the high-temperature and high-pressure container in the marine environment as claimed in claim 1, wherein multiple layers of filter screens for inhibiting liquid from shaking are arranged in the liquid collecting container.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202011490784.2A CN112665682B (en) | 2020-12-17 | 2020-12-17 | High-temperature high-pressure container liquid level measuring system under marine environment |
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| CN114199343A (en) * | 2021-11-19 | 2022-03-18 | 领翌技术(横琴)有限公司 | Method and device for measuring liquid level in container |
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| CN114111955A (en) * | 2021-12-09 | 2022-03-01 | 辽宁毕托巴科技股份有限公司 | Metering device for volume and mass of oil in transportation oil tank |
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| CN102288256A (en) * | 2011-09-01 | 2011-12-21 | 中国海洋石油总公司 | Liquid level measurement system of closed container |
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