CN111122648A - Online measurement device and method for heat conductivity coefficient of crude oil in pressurized oil pipeline - Google Patents
Online measurement device and method for heat conductivity coefficient of crude oil in pressurized oil pipeline Download PDFInfo
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- CN111122648A CN111122648A CN201911353100.1A CN201911353100A CN111122648A CN 111122648 A CN111122648 A CN 111122648A CN 201911353100 A CN201911353100 A CN 201911353100A CN 111122648 A CN111122648 A CN 111122648A
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- G01N25/00—Investigating or analyzing materials by the use of thermal means
- G01N25/20—Investigating or analyzing materials by the use of thermal means by investigating the development of heat, i.e. calorimetry, e.g. by measuring specific heat, by measuring thermal conductivity
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Abstract
The invention discloses an on-line measuring device for the heat conductivity coefficient of crude oil in a pressurized oil pipeline and a using method thereof, belonging to the technical field of automatic oil and gas metering. The device of the invention comprises: the measuring device comprises an oblate measuring pipe section, a copper plate, a hollow thin copper plate, an air compressor, a heating water bath, a temperature control water bath, a temperature sensor, a liquid level monitor, a computer processing system, a corresponding automatic valve and a corresponding pipeline. The invention also discloses a method for measuring the heat conductivity coefficient of the crude oil by using the device. The testing device is simple in structure, can timely and accurately test the heat conductivity coefficient of the crude oil in the oil conveying pipeline with pressure, is high in automation degree in the testing process, and reduces the workload of workers.
Description
Technical Field
The invention belongs to the technical field of automatic oil and gas metering, and particularly relates to an online measuring device and method for the heat conductivity coefficient of crude oil in a pressurized oil pipeline.
Background
Along with the industrial development, the demand of China for crude oil is continuously increased, and correspondingly, the development of crude oil pipeline transportation is very rapid. The crude oil produced in China is mainly paraffin-based crude oil, and is characterized by high wax content and high condensation point, and a heating and conveying pipeline mode is usually adopted. The heating pipe conveying is safely and efficiently carried out, so that the running cost in the pipe conveying process can be reduced, the energy is saved, and the consumption is reduced. For the heated transportation of crude oil, the thermal conductivity of crude oil is a very important parameter.
At present, a sampling method is mainly adopted for measuring the heat conductivity coefficient of crude oil in an oil field, after the crude oil is sampled in a pipe transportation process, a liquid heat conductivity coefficient measuring device is used for testing the heat conductivity coefficient of the crude oil, the automation degree is low, and the change of the heat conductivity coefficient of the crude oil in the pipe transportation process cannot be monitored in real time. Meanwhile, the liquid thermal conductivity coefficient measuring device adopted at the present stage generally adopts a second type boundary condition of unsteady heat transfer to solve the temperature field, needs a high-precision heating copper needle, has high requirements on the measuring environment, and is not suitable for complex and changeable field environments.
Therefore, the economical and efficient online measurement device for the heat conductivity coefficient of the crude oil in the oil pipeline can automatically detect the heat conductivity coefficient change of the crude oil in the pipeline in real time, reduces the working strength of personnel, and has important engineering significance for ensuring the safe and economic operation of the pipeline. However, no such device has been reported so far.
Disclosure of Invention
In view of the above, the present invention aims to provide an on-line measurement apparatus for crude oil thermal conductivity in an oil pipeline, which is adaptive to complex field conditions and has a simple structure, and a use method thereof, and is used for measuring crude oil thermal conductivity in a crude oil pipeline transmission process in real time.
In order to realize the aim of the invention, the invention provides an on-line measuring device for the heat conductivity coefficient of crude oil in a pressure oil pipeline, which comprises a oblate measuring pipe section, a copper plate, a hollow thin copper plate, a circulating water jacket, a heating water bath, a temperature control water bath, an automatic rotating shaft, an air compressor, a computer, a temperature sensor, a liquid level monitor, a corresponding automatic valve and a pipeline, wherein the oblate measuring pipe section is connected with the oil pipeline to ensure that the crude oil to be measured can be obtained in real time, the copper plate is one end of the oblate measuring pipe section to ensure that the crude oil in the measuring pipe section can be heated by the hollow thin copper plate, the hollow thin copper plate is connected with the oblate measuring pipe section through the automatic rotating shaft to ensure that the hollow thin copper plate can be automatically attached to or separated from the oblate measuring pipe section, the heating water bath is connected with the hollow thin copper plate to, the temperature control water bath controls the initial temperature of the oblate measuring pipe section through the circulating water jacket, the air compressor is connected with the oblate measuring pipe section to empty crude oil in the measuring pipe section, and the temperature sensor and the liquid level monitor are positioned in the oblate measuring pipe section to measure the temperature and the liquid level of the crude oil.
Preferably, the oblate measuring tube section is of a large-diameter cylindrical structure, the volume of the oblate measuring tube section is 15-25 liters, the ratio of the length to the radius is 1: 5-1: 10, one end of the oblate measuring tube section is a copper plate, and the thickness of the oblate measuring tube section is less than 2 millimeters.
Preferably, the hollow thin copper plate is internally provided with a cavity filled with circulating water, one end of the hollow thin copper plate, which is far away from the measuring pipe section, is laid with a heat-insulating layer, and one end of the hollow thin copper plate, which is close to the measuring pipe section, can be tightly attached to the copper plate after rotating.
Preferably, the temperature of the hollow thin copper plate is controlled to be 3-6 ℃ higher than the room temperature by the heating water bath, and the temperature of the crude oil in the measuring pipe section is controlled to be 1-2 ℃ higher than the room temperature by the temperature-controlled water bath.
Preferably, the temperature measuring point of the temperature sensor is located on the central axis of the measuring pipe section, and one temperature measuring point of the temperature sensor is located in the center of the measuring pipe section.
The invention provides an on-line measuring method for the heat conductivity coefficient of crude oil in an oil pipeline, which comprises the following steps:
1. crude oil injection: the crude oil in the oil pipeline is injected into the oblate measuring pipe section through the pipe conveying pressure, and the liquid level monitor is utilized to judge whether the measuring pipe section is filled with the crude oil or not so as to ensure that the measuring pipe section is filled with the crude oil and the pressure in the measuring pipe section is the same as the pipe conveying pressure;
2. heating crude oil: the automatic rotating shaft is used for controlling the hollow thin copper plate to be separated from the measuring pipe section, the heating water bath is used for heating the hollow thin copper plate, the temperature control water bath is used for heating crude oil in the measuring pipe section through the circulating water jacket, and the temperature sensor is used for judging that the temperature of the crude oil in the measuring pipe section reaches a preset initial temperature;
3. measuring the heat conductivity coefficient: when the temperature of crude oil in a measuring pipe section is stable, the automatic rotating shaft is used for controlling the hollow thin copper plate to rotate, the hollow thin copper plate is attached to the copper plate at a higher speed, the temperature sensor is used for measuring and recording the temperature change of the crude oil in a shorter time, and the computer is used for fitting the heat conductivity coefficient of the crude oil under the third type of boundary condition of unsteady heat conduction;
4. crude oil discharge: after the temperature measurement is finished, the air compressor is utilized to discharge the crude oil in the measurement pipe section, the liquid level monitor is utilized to judge whether the crude oil is completely discharged, and after the crude oil is completely discharged, the air compressor and the temperature control water bath stop working.
The invention is suitable for the on-line measurement of the heat conductivity coefficient of the crude oil in the oil pipeline under the heating and conveying condition. The invention has simple structure and convenient operation, can accurately measure the content of the heat conductivity coefficient of the crude oil under the pressure condition, has short measurement period and small measurement loss in the measurement process, and provides a technical means for realizing the on-line measurement of the heat conductivity coefficient of the crude oil in the oil pipeline.
Drawings
FIG. 1 is a schematic view of an on-line measurement device for the heat conductivity of crude oil in an oil pipeline provided by the invention.
FIG. 2 is a schematic representation of the temperature of the crude oil within an oblate measurement tube segment as a function of position and time.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be further described with reference to the accompanying drawings, but it should be understood that the scope of the present invention is not limited thereto.
As shown in fig. 1, the online measurement device for the heat conductivity of crude oil in an oil pipeline provided by the invention comprises an oblate measurement pipe section 1, a copper plate 2, a hollow thin copper plate 3, a circulating water jacket 4, a heating water bath 5, a temperature-controlled water bath 6, an automatic rotating shaft 7, an air compressor 8, a computer 9, a temperature sensor 10, a temperature sensor 11, a temperature sensor 12, a temperature sensor 13, a temperature sensor 14, a liquid level monitor 15, an oil inlet valve 16, an air compressor valve 17, a circulating water valve 18, a circulating water valve 19, a circulating water valve 20, a circulating water valve 21, an air release valve 22 and an air release valve 23.
Oblate measurement pipe section 1 links to each other with oil pipeline through inlet valve 16, copper 2 is oblate measurement pipe section 1's one end, hollow thin copper plate 3 links to each other with oblate measurement pipe section 1 through automatic rotary shaft 7, heating water bath 5 links to each other with hollow thin copper plate 3 through circulation water valve 20, circulation water valve 21, accuse temperature water bath 6 links to each other with circulation water jacket 4 through circulation water valve 18, circulation water valve 19, and circulation water jacket 4 parcel oblate measurement pipe section 1 except that copper 2, and air compressor 8 links to each other with oblate measurement pipe section 1 through air compressor machine valve 17, with temperature sensor 10, temperature sensor 11, temperature sensor 12, temperature sensor 13, temperature sensor 14 and liquid level monitor 15 are located oblate measurement pipe section 1.
Before a heat conductivity coefficient measurement experiment is started, it is ensured that the oblate measurement pipe section 1 is horizontally placed and fixed, all valves are in a normally closed state, the heating water bath 5, the temperature control water bath 6 and the air compressor 8 are in a closed state, the hollow thin copper plate 3 and the oblate measurement pipe section 1 are tightly attached, the radius of the oblate measurement pipe section 1 is 0.3m, the length of the oblate measurement pipe section 1 is 0.06m, the volume of the oblate measurement pipe section 1 is 17L, the temperature sensor 10, the temperature sensor 11, the temperature sensor 12, the temperature sensor 13 and the temperature sensor 14 are located on a central axis in the oblate measurement pipe section 1, the distances from the flat copper plate 2 are 0.005m, 0.01m, 0.015m, 0.03m and 0.06m respectively, and the liquid level monitor 15 is also located at the position of 0.06 m.
Crude oil injection: sequentially opening an oil inlet valve 16 and an air release valve 23, injecting crude oil into the oblate measuring pipe section 1 by using pipe conveying pressure in an oil conveying pipeline, judging whether the oblate measuring pipe section 1 is filled with the crude oil or not by using the liquid level monitor 15, and sequentially closing the air release valve 23 and the oil inlet valve 16 after the crude oil is filled;
heating crude oil: before heating begins, the hollow thin copper plate 3 is controlled to rotate 180 degrees by the automatic rotating shaft 7, the hollow thin copper plate is separated from the oblate measuring pipe section 1, the circulating water valve 18, the circulating water valve 19, the circulating water valve 20 and the circulating water valve 21 are sequentially opened, the temperature of the hollow thin copper plate 3 is controlled to be 32 ℃ by the heating water bath 5, the oblate measuring pipe section 1 is heated by the temperature control water bath 6 through the circulating water jacket 4 until the crude oil temperature in the oblate measuring pipe section 1 is measured by the temperature sensor 10, the temperature sensor 11, the temperature sensor 12, the temperature sensor 13 and the temperature sensor 14 to be 30 ℃ and stable;
temperature measurement: the automatic rotating shaft 7 is utilized to control the hollow thin copper plate 3 to rotate 180 degrees and closely adhere to the copper plate 2 at a higher speed, and the temperature sensors 10, 11, 12, 13 and 14 measure and record the temperature changes of crude oil at different positions for 0.5s, 1s and 1.5s to obtain a temperature distribution curve L1、L2、L3Fitting the thermal conductivity of the crude oil by the computer 9 under the third type of boundary condition of unsteady heat conduction;
crude oil discharge: open atmospheric valve 22 and air compressor machine valve 17 in proper order, utilize air compressor 8 discharges the interior crude oil of oblate survey pipeline section 1, utilizes liquid level monitor 15 judges whether the crude oil is discharged completely, and after the crude oil was discharged completely, air compressor 8 stop work, add hot water bath 5, accuse temperature water bath 6 stop work, close air compressor machine valve 17, atmospheric valve 22 and circulation water valve 18, circulation water valve 19, circulation water valve 20, circulation water valve 21 in proper order.
The method has the advantages that the structure is simple, the automation degree of the testing process is high, the workload of workers is greatly reduced, and the online measurement requirement of the heat conductivity coefficient of the crude oil in the oil pipeline with pressure can be met.
Claims (6)
1. An on-line measuring device for the heat conductivity coefficient of crude oil in a pressurized oil pipeline comprises an oblate measuring pipe section (1), a copper plate (2), a hollow thin copper plate (3), a circulating water jacket (4), a heating water bath (5), a temperature control water bath (6), an automatic rotating shaft (7), an air compressor (8), a computer (9), temperature sensors (10), (11), (12), (13), (14), a liquid level monitor (15), an oil inlet valve (16), an air compressor valve (17), circulating water valves (18), (19), (20), (21) and emptying valves (22) and (23), and is characterized in that the oblate measuring pipe section (1) is connected with the oil pipeline, the copper plate (2) is one end of the oblate measuring pipe section (1), the hollow thin copper plate (3) is connected with the oblate measuring pipe section (1) through the automatic rotating shaft (7), the heating water bath copper plate (5) is connected with the hollow thin copper plate (3), the temperature control water bath (6) is connected with the circulating water jacket (4), the air compressor (8) is connected with the oblate measuring pipe section (1), and the temperature sensors (10), (11), (12), (13), (14) and the liquid level monitor (15) are arranged in the oblate measuring pipe section (1).
2. The device according to claim 1, characterized in that the oblate measuring tube segment (1) is a large diameter cylindrical structure with a volume of 15-25 liters and a length to radius ratio of 1:5 to 1:10, and has a copper plate (2) at one end and a thickness of less than 2 mm.
3. The device according to claim 1, characterized in that the hollow thin copper plate (3) is internally provided with a cavity filled with circulating water, the end of the hollow thin copper plate far away from the measuring pipe section is coated with an insulating layer, and after rotation, the end of the hollow thin copper plate near the measuring pipe section can be tightly attached to the copper plate (2).
4. The device according to claim 1, characterized in that the heating water bath (5) controls the temperature of the hollow thin copper plate to be 3-6 ℃ higher than the room temperature, and the temperature-controlled water bath (6) controls the temperature of the crude oil in the measuring pipe section to be 1-2 ℃ higher than the room temperature.
5. The device according to claim 1, characterized in that the temperature measuring point of the temperature sensor (10) (11) (12) (13) (14) is located on the central axis of the measuring pipe section, and the temperature measuring point of the temperature sensor (13) is located in the center of the measuring pipe section.
6. An on-line measuring method for the heat conductivity coefficient of crude oil in an oil pipeline, which adopts the on-line measuring device for the heat conductivity coefficient of crude oil in the oil pipeline with pressure according to any one of claims 1 to 5, is characterized by comprising the following steps:
s1, crude oil injection: all valves are kept in a normally closed state before measurement is started, after the measurement is started, an oil valve (16) and an air release valve (23) are sequentially and automatically opened, crude oil in an oil pipeline enters an oblate measurement pipe section (1) through pipe pressure, whether the measurement pipe section is filled with the crude oil is judged through a liquid level monitor (15), and after the measurement pipe section is filled with the crude oil, the air release valve (23) and the oil valve (16) are sequentially and automatically closed;
s2, heating crude oil: before heating begins, the automatic rotating shaft (7) controls the hollow thin copper plate (3) to be separated from the measuring pipe section, the circulating water valves (18), (19), (20) and (21) are sequentially and automatically opened, the heating water bath (5) begins to heat the hollow thin copper plate, and the temperature control water bath (6) begins to heat the oblate measuring pipe section (1) through the circulating water jacket (4) until the temperature sensors (10), (11), (12) and (13) and (14) measure that the crude oil temperature in the measuring pipe section is a preset temperature and is stable;
s3, measuring the heat conductivity coefficient: when the temperature of crude oil in a measuring pipe section is stable, an automatic rotating shaft (7) controls a hollow thin copper plate (3) to rotate and is attached to a copper plate (2) at a high speed, temperature sensors (10), (11), (12), (13) and (14) measure and record the temperature change of the crude oil in a short time until the temperature at the temperature sensor (13) changes, and the heat conductivity coefficient of the crude oil is fitted by a computer (9) under the third type of boundary condition of unsteady heat conduction;
s4, crude oil discharge: after the temperature measurement is finished, the emptying valve (22) and the air compressor valve (17) are sequentially and automatically opened, crude oil in the oblate measuring pipe section (1) is discharged through the air compressor (8), whether the crude oil is completely discharged is judged through the liquid level monitor (15), after the crude oil is completely discharged, the air compressor (8) stops working, the heating water bath (5) and the temperature control water bath (6) stop working, and the air compressor valve (17), the emptying valve (22) and the circulating water valves (18) (19) (20) (21) are sequentially and automatically closed.
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Cited By (2)
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| CN112763539A (en) * | 2020-12-25 | 2021-05-07 | 北京航星机器制造有限公司 | Detection device and detection method for liquid in metal container |
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