CN111692334B - Pressure vessel liquid level measurement system and method - Google Patents
Pressure vessel liquid level measurement system and method Download PDFInfo
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- CN111692334B CN111692334B CN202010573044.9A CN202010573044A CN111692334B CN 111692334 B CN111692334 B CN 111692334B CN 202010573044 A CN202010573044 A CN 202010573044A CN 111692334 B CN111692334 B CN 111692334B
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- 239000007788 liquid Substances 0.000 title claims abstract description 43
- 238000005259 measurement Methods 0.000 title claims abstract description 27
- 238000000034 method Methods 0.000 title claims abstract description 15
- 229920006395 saturated elastomer Polymers 0.000 claims abstract description 31
- 238000003331 infrared imaging Methods 0.000 claims abstract description 11
- 238000005485 electric heating Methods 0.000 claims abstract description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 19
- 230000001133 acceleration Effects 0.000 claims description 3
- 230000005484 gravity Effects 0.000 claims description 3
- 238000000638 solvent extraction Methods 0.000 abstract 1
- 238000009826 distribution Methods 0.000 description 8
- 238000000691 measurement method Methods 0.000 description 8
- 238000013461 design Methods 0.000 description 2
- 238000009776 industrial production Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000013307 optical fiber Substances 0.000 description 1
- 238000005192 partition Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Images
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J12/00—Pressure vessels in general
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F23/00—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm
- G01F23/14—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measurement of pressure
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J5/00—Radiation pyrometry, e.g. infrared or optical thermometry
- G01J5/0037—Radiation pyrometry, e.g. infrared or optical thermometry for sensing the heat emitted by liquids
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J5/00—Radiation pyrometry, e.g. infrared or optical thermometry
- G01J5/48—Thermography; Techniques using wholly visual means
- G01J5/485—Temperature profile
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L13/00—Devices or apparatus for measuring differences of two or more fluid pressure values
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L19/00—Details of, or accessories for, apparatus for measuring steady or quasi-steady pressure of a fluent medium insofar as such details or accessories are not special to particular types of pressure gauges
- G01L19/04—Means for compensating for effects of changes of temperature, i.e. other than electric compensation
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J5/00—Radiation pyrometry, e.g. infrared or optical thermometry
- G01J2005/0077—Imaging
Abstract
The invention discloses a system and a method for measuring the liquid level of a pressure vessel, wherein the measuring system comprises the pressure vessel, a differential pressure transmitter and a balance tank, a lower pressure taking port of the pressure vessel is connected with the negative pressure side of the differential pressure transmitter, an upper pressure taking port of the pressure vessel is connected with the balance tank, the balance tank is connected with the positive pressure side of the differential pressure transmitter, an electric heating element is arranged at the inner bottom of the pressure vessel, the interior of the pressure vessel is divided into a region A and a region B, the region A is a saturated region at the upper part, the region B is an unsaturated region at the lower part, a temperature sensor is arranged in the region A, a plurality of temperature sensors are arranged in the region B, and a cold section pressure guiding pipe between the balance tank and the differential pressure transmitter adopts an infrared imaging thermometer to measure the temperature. According to the invention, density compensation is performed on the inner part of the pressure container in a partitioning manner, so that the problem of inaccurate measurement caused by the liquid level measurement by the existing differential pressure method is solved.
Description
Technical Field
The invention relates to the technical field of measurement and control, in particular to a system and a method for measuring the liquid level of a pressure container.
Background
The pressure vessel is often exposed to high temperature and high pressure during use, and the pressure vessel is directly affected by the high temperature medium in the pressure vessel. In order to ensure the safety and effectiveness of the pressure vessel in use in high temperature and high pressure environments, the measurement of the medium level inside the pressure vessel is a critical task. In industrial application, in order to ensure the smooth proceeding of industrial production and the safety of pressure vessels under high temperature and high pressure, the liquid level state of the corresponding pressure vessel needs to be measured and monitored. At present, liquid level measurement methods are various, and an ultrasonic liquid level measurement method based on an electronic circuit, a liquid level measurement method based on a differential pressure transmitter and the like are available.
Measurement methods based on electronic circuits are often influenced by environments (such as high-temperature and high-pressure environments) and other aspects, and the measurement accuracy needs to be improved, for example, documents of experimental research on liquid level control based on ultrasonic sensors and design of optical fiber Bragg grating variable sensitivity liquid level sensors are disclosed.
The liquid level measurement method based on the differential pressure transmitter is widely applied to liquid level measurement of a pressure vessel, the liquid level measurement based on the differential pressure transmitter improves the liquid level measurement precision by utilizing density fitting, and the existing liquid level measurement based on the differential pressure transmitter completely considers the inside of the pressure vessel as a saturated state for liquid level measurement, so that the measurement accuracy is not high.
Disclosure of Invention
The invention aims to provide a system and a method for measuring the liquid level of a pressure container, which solve the problem of inaccurate measurement caused by the liquid level measurement by the existing differential pressure method.
The invention is realized by the following technical scheme:
the pressure vessel liquid level measurement system comprises a pressure vessel, a differential pressure transmitter and a balance tank, wherein a lower pressure taking port of the pressure vessel is connected with a negative pressure side of the differential pressure transmitter, an upper pressure taking port of the pressure vessel is connected with the balance tank, the balance tank is connected with a positive pressure side of the differential pressure transmitter, an electric heating element is arranged at the inner bottom of the pressure vessel, the pressure vessel is internally divided into a region A and a region B, the region A is a saturated region at the upper part, the region B is an unsaturated region at the lower part, a temperature sensor is arranged in the region A, a plurality of temperature sensors are arranged in the region B, and a cold section pressure leading pipe between the balance tank and the differential pressure transmitter adopts an infrared imaging thermometer to measure the temperature.
When the electric heating element heats the pressure container, the water temperature in the pressure container can be layered, the whole pressure container can not reach a complete saturated state, but the water temperature at the bottom position of the lower part of the pressure container is too low, so that the phenomenon that the space where saturated steam in the pressure container is positioned is similar to a saturated state (the upper part of the pressure container) is presented; the medium water temperature in the pressure vessel is not uniform, and the medium water temperature belongs to an unsaturated state (the lower part of the pressure vessel).
According to the invention, the pressure container is divided into a saturated area (area A) and an unsaturated area (area B), a plurality of temperature sensors are arranged in the unsaturated area with uneven temperature distribution, density compensation is carried out on the unsaturated area by using a temperature average value, the cold-section pressure guiding pipe obtains the temperature distribution value of the cold-section pressure guiding pipe by using an infrared imaging thermometer for measurement, the dynamic average temperature value of the cold-section pressure guiding pipe is obtained by carrying out average calculation on the temperature distribution value, and the density compensation is carried out on the cold-section water to obtain the compensated density value.
Further, the temperature sensors in the region B are arranged at regular intervals from top to bottom.
Further, the electric heating element is arranged at the bottom in the pressure vessel.
A measuring method based on a pressure container liquid level measuring system comprises the following steps:
s1, dividing the interior of the pressure container into an area A and an area B, wherein the area A is a saturated area at the upper part, the area B is a non-saturated area at the lower part, one temperature sensor is arranged in the area A, and a plurality of temperature sensors are arranged in the area B;
s2, respectively acquiring the average temperature of the area B, the saturated steam temperature of the area A, the average temperature of the cold section pressure guiding pipe and the differential pressure transmitter value delta P;
s3, compensating the liquid water density by the area B by using the average value measured by a plurality of temperature sensors to obtain a compensated density value
The saturated steam density is compensated by the saturated steam temperature in the area A to obtain a compensated density value rhog(T) the cold section pressure leading pipe adopts a dynamic average temperature value obtained by measurement based on an infrared imaging thermodetector to perform density compensation on cold section water to obtain a compensated density value
S4 density value through differential pressure transmitter value delta P
Density value ρg(T) and Density value
The liquid level L in the pressure vessel is calculated.
The invention provides an optimized liquid level measuring method which is improved on the basis of the traditional differential pressure liquid level measuring method and the traditional differential pressure liquid level measuring device. The pressure vessel is first divided into a saturated zone and an unsaturated zone. The saturated region is the region where the saturated steam is located, and the temperature obtained by measurement is utilized to measure the density rho of the saturated steamgPerforming compensation; the unsaturated region is the region where the medium water is located, and the average temperature is utilized to measure the density rho of the medium waterw1And compensating, namely arranging temperature sensors as many as possible in the unsaturated area according to the actual condition, measuring the temperature distribution value of the cold-section pressure guide pipe by using an infrared imaging temperature measuring instrument through the cold-section pressure guide pipe, carrying out average calculation on the temperature distribution value to obtain the dynamic average temperature value of the pressure guide pipe, and carrying out density compensation on the cold-section water to obtain the compensated density value.
Further, the calculation formula of the liquid level L is as follows:
wherein H is the height of the pressure vessel; t is the temperature in the pressure vessel; g is the acceleration of gravity.
Compared with the prior art, the invention has the following advantages and beneficial effects:
1. the invention further defines the internal state of the pressure container, and adopts different density compensation strategies for media in different states in the pressure container, thereby improving the liquid level measurement accuracy of the pressure container in a high-temperature and high-pressure state, and overcoming the large error caused by the traditional high-temperature and high-pressure liquid level measurement method that the internal part of the pressure container is completely regarded as a saturated state for liquid level measurement.
2. The measuring method can accurately and reliably measure the liquid level of the pressure container in the high-temperature and high-pressure environment, and improves the safety and reliability of industrial production and the pressure container.
3. The measuring method of the invention has simple principle, reasonable design of the measuring device and simple and easy realization on the whole.
Drawings
The accompanying drawings, which are included to provide a further understanding of the embodiments of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the principles of the invention. In the drawings:
FIG. 1 is a flow chart of a liquid level measurement method of the present invention;
FIG. 2 is a schematic view of a liquid level partition measuring method.
Reference numbers and corresponding part names in the drawings:
1-pressure vessel, 2-differential pressure transmitter, 3-balance tank, 4-electric heating element, 5-infrared imaging thermodetector, 6-cold section pressure guiding tube.
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 examples and accompanying drawings, and the exemplary embodiments and descriptions thereof are only used for explaining the present invention and are not meant to limit the present invention.
Example 1:
as shown in FIG. 2, the pressure vessel liquid level measuring system comprises a pressure vessel 1, a differential pressure transmitter 2 and a balance tank 3, wherein the pressure is measured by the pressure vesselVessel 1 'S lower pressure port X is connected with differential pressure transmitter 2' S negative pressure side, and pressure vessel 1 'S last pressure port S and 3 interface M of surge tank are connected, 3 interface N of surge tank are connected with differential pressure transmitter 2' S malleation side, pressure vessel 1 'S interior bottom is provided with electric heating element 4, electric heating element 4 installs bottom in pressure vessel 1, pressure vessel 1' S inside is divided into region A and region B, region A is the saturated region on upper portion, region B is the unsaturated region of lower part, arrange a temperature sensor A in the region A1A plurality of temperature sensors are arranged in the area B, and the temperature sensors are respectively B1、B2、B3And B4，B1、B2、B3And B4From top to bottom are arranged at equal intervals, the cold-section pressure-leading pipe 6 between the balance tank 3 and the differential pressure transmitter 2 adopts an infrared imaging temperature measuring instrument 5 to measure the temperature, and the temperature distribution of the cold-section pressure-leading pipe 6 is as follows: one end of the self-balancing tank 3 is sequentially T from one end of the differential pressure transmitter 2c1、Tc2、Tc3To Tcn。
Example 2:
as shown in fig. 1 and fig. 2, a measurement method of a pressure vessel liquid level measurement system according to embodiment 1 includes the following steps:
s1, dividing the interior of the pressure container 1 into an area A and an area B, wherein the area A is a saturated area at the upper part, the area B is a non-saturated area at the lower part, one temperature sensor is arranged in the area A, and a plurality of temperature sensors are arranged in the area B, and the temperature sensors are respectively B1、B2、B3And B4；
S2, respectively acquiring the average temperature of the area B, the saturated steam temperature of the area A and the average temperature of the cold-section pressure guiding pipe 6, and the differential pressure transmitter value delta P:
measuring by using a differential pressure transmitter 2 to obtain a pressure difference value delta P of the pressure vessel;
and (3) compensation of medium density in the area A: because the area A is in a saturated state, the saturated water vapor density can be compensated by using the real-time temperature obtained by measurement, and finally the compensated rho is obtainedg(T) value;
region B medium density patchAnd (4) compensation: since the region B is not saturated and the temperature of the water in the region B is not uniform, the average temperature in the region B is measured first
Thereby utilizing the average temperature
Density compensation is carried out on the medium water to obtain a compensated density value
And (3) water density compensation of the cold section pressure leading pipe 6: firstly, the temperature distribution value of the cold-section pressure-leading pipe 6 is obtained by utilizing the infrared imaging thermodetector 5 to measure, and the dynamic average temperature of the cold-section pressure-leading pipe 6 is obtained by carrying out average calculation based on the temperature distribution value
Thereby utilizing the dynamic average temperature
Density compensation is carried out on the cold section water to obtain a compensated density value
S3, compensating the liquid water density by the area B by using the average value measured by a plurality of temperature sensors to obtain a compensated density value
The saturated steam density is compensated by the saturated steam temperature in the area A to obtain a compensated density value rhog(T) and the cold section pressure leading pipe 6 adopt a dynamic average temperature value obtained by measurement based on the infrared imaging temperature measuring instrument 5 to perform density compensation on cold section water to obtain a compensated density value
S4 density value through differential pressure transmitter value delta P
Density value ρg(T) and Density value
Calculating the liquid level L in the pressure container 1; the calculation formula of the liquid level L is as follows:
wherein H is the height of the pressure vessel 1, m; t is the temperature in the pressure vessel 1, DEG C; g is the acceleration of gravity.
The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are merely exemplary embodiments of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (5)
1. The pressure vessel liquid level measuring system is characterized by comprising a pressure vessel (1), a differential pressure transmitter (2) and a balance tank (3), the lower pressure taking port of the pressure vessel (1) is connected with the negative pressure side of the differential pressure transmitter (2), the upper pressure taking port of the pressure vessel (1) is connected with the balance tank (3), the balance tank (3) is connected with the positive pressure side of the differential pressure transmitter (2), the inner bottom of the pressure container (1) is provided with an electric heating element (4), the interior of the pressure vessel (1) is divided into an area A and an area B, the area A is a saturated area at the upper part, the area B is a lower unsaturated area, a temperature sensor is arranged in the area A, a plurality of temperature sensors are arranged in the area B, and a cold section pressure leading pipe (6) between the balance tank (3) and the differential pressure transmitter (2) measures temperature by adopting an infrared imaging temperature measuring instrument (5).
2. The pressure vessel level measurement system of claim 1, wherein the temperature sensors in zone B are evenly spaced from top to bottom.
3. Pressure vessel level measurement system according to claim 1, wherein the electric heating element (4) is mounted at the bottom inside the pressure vessel (1).
4. A measuring method based on the pressure vessel level measuring system of any one of claims 1-3, characterized by comprising the steps of:
s1, dividing the interior of the pressure container (1) into an area A and an area B, wherein the area A is a saturated area at the upper part, the area B is a non-saturated area at the lower part, one temperature sensor is arranged in the area A, and a plurality of temperature sensors are arranged in the area B;
s2, respectively acquiring the average temperature of the area B, the saturated steam temperature of the area A, the average temperature of the cold section pressure guiding pipe (6) and a differential pressure transmitter value delta P;
s3, compensating the liquid water density by the area B by using the average value measured by a plurality of temperature sensors to obtain a compensated density value
The saturated steam density is compensated by the saturated steam temperature in the area A to obtain a compensated density value rhog(T) and the cold section pressure leading pipe (6) adopt a dynamic average temperature value obtained by measurement based on the infrared imaging temperature measuring instrument (5) to perform density compensation on cold section water to obtain a compensated density value
S4 density value through differential pressure transmitter value delta P
Density value ρg(T) and Density value
The liquid level L in the pressure vessel (1) is calculated.
5. A measuring method of a pressure vessel liquid level measuring system according to claim 4, characterized in that the calculation formula of the liquid level L is as follows:
wherein H is the height of the pressure vessel (1); t is the temperature in the pressure vessel (1); g is the acceleration of gravity.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010573044.9A CN111692334B (en) | 2020-06-22 | 2020-06-22 | Pressure vessel liquid level measurement system and method |
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| CN202010573044.9A CN111692334B (en) | 2020-06-22 | 2020-06-22 | Pressure vessel liquid level measurement system and method |
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| CN111692334B true CN111692334B (en) | 2022-04-15 |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101986108A (en) * | 2010-09-16 | 2011-03-16 | 沈阳工程学院 | Differential pressure type liquid level measurement device for pressure container |
| CN204963943U (en) * | 2015-04-27 | 2016-01-13 | 中石化宁波工程有限公司 | Density correction device for liquid level detection |
| CN205449220U (en) * | 2015-12-31 | 2016-08-10 | 中国神华能源股份有限公司 | Storage tank liquid level measurement device and storage tank measurement system |
| CN206990053U (en) * | 2017-07-17 | 2018-02-09 | 大唐黑龙江发电有限公司哈尔滨第一热电厂 | Novel liquid level measurement mechanism |
| CN110763300A (en) * | 2019-10-24 | 2020-02-07 | 上海交通大学 | System and method for measuring dynamic liquid level in pipe under steam water working condition |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS56133613A (en) * | 1980-03-25 | 1981-10-19 | Toshiba Corp | Liquid level gauge system |
| FR2922992B1 (en) * | 2007-10-26 | 2010-04-30 | Air Liquide | METHOD FOR REAL-TIME DETERMINATION OF THE FILLING LEVEL OF A CRYOGENIC RESERVOIR |
| CN102840896B (en) * | 2012-09-05 | 2015-06-10 | 中国石油化工集团公司 | Liquid level measuring device |
| CN106940215B (en) * | 2017-02-07 | 2023-05-16 | 沈阳华控科技发展有限公司 | Intelligent compensation built-in drum liquid level measuring device |
| CA2983541C (en) * | 2017-10-24 | 2019-01-22 | Exxonmobil Upstream Research Company | Systems and methods for dynamic liquid level monitoring and control |
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2020
- 2020-06-22 CN CN202010573044.9A patent/CN111692334B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101986108A (en) * | 2010-09-16 | 2011-03-16 | 沈阳工程学院 | Differential pressure type liquid level measurement device for pressure container |
| CN204963943U (en) * | 2015-04-27 | 2016-01-13 | 中石化宁波工程有限公司 | Density correction device for liquid level detection |
| CN205449220U (en) * | 2015-12-31 | 2016-08-10 | 中国神华能源股份有限公司 | Storage tank liquid level measurement device and storage tank measurement system |
| CN206990053U (en) * | 2017-07-17 | 2018-02-09 | 大唐黑龙江发电有限公司哈尔滨第一热电厂 | Novel liquid level measurement mechanism |
| CN110763300A (en) * | 2019-10-24 | 2020-02-07 | 上海交通大学 | System and method for measuring dynamic liquid level in pipe under steam water working condition |
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