CN105865553B - Gas-solid two-phase flowmeter and flow measuring method thereof - Google Patents
Gas-solid two-phase flowmeter and flow measuring method thereof Download PDFInfo
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- CN105865553B CN105865553B CN201510037321.3A CN201510037321A CN105865553B CN 105865553 B CN105865553 B CN 105865553B CN 201510037321 A CN201510037321 A CN 201510037321A CN 105865553 B CN105865553 B CN 105865553B
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Abstract
The invention discloses a gas-solid two-phase flow flowmeter and a flow measuring method thereof, relates to the technical field of flowmeters, and is designed for solving the problems of low measuring precision and the like of the existing flowmeter. The gas-solid two-phase flow meter comprises a measuring pipe, at least two flow detection units arranged in the measuring pipe and a control unit connected with the at least two flow detection units; the control unit is used for selecting the flow value detected by the corresponding flow detection unit to output according to the material flow parameter in the pipeline output by each flow detection unit. Meanwhile, a flow measuring method of the gas-solid two-phase flow meter is provided. The gas-solid two-phase flow meter provided by the invention is provided with at least two flow detection units packaged in a measuring pipe, and the control unit can select the flow value detected by the corresponding flow detection unit to output according to the material flow parameter in the pipeline output by each detection unit, so that the measurement range and precision of the flow meter are expanded, and the gas-solid two-phase flow meter is suitable for pipeline flow measurement with large material flow change.
Description
Technical Field
The invention relates to the technical field of flowmeters, in particular to a gas-solid two-phase flowmeter and a flow measuring method adopting the flowmeter.
Background
The solid flowmeter is widely applied to medium flow detection in a pneumatic conveying device and a free-fall type conveying process so as to ensure that the medium flow control is in a proper range.
The existing flow detection is carried out by adopting a single flowmeter, the measurement principle is different, the measurement range of the single flowmeter is smaller, and when the flow change of materials in a pipeline is larger, the single flowmeter cannot meet the requirement of measurement precision.
In view of the above problems, a new gas-solid two-phase flow meter is needed to solve the problems of small measurement range and low measurement accuracy of the existing flow meter.
Disclosure of Invention
The invention aims to provide a gas-solid two-phase flow meter with a large measurement range and high measurement precision.
The invention further aims to provide a flow measuring method with a large measuring range and high measuring precision.
To achieve the purpose, on one hand, the invention adopts the following technical scheme:
a gas-solid two-phase flow meter comprises a measuring pipe, at least two flow detection units arranged in the measuring pipe and a control unit connected with the at least two flow detection units;
and the control unit is used for selecting the flow value detected by the corresponding flow detection unit to output according to the material flow parameter in the pipeline output by each flow detection unit.
Preferably, the material flow parameter is a material flow value or a void ratio in the pipeline.
Preferably, the at least two flow rate detection units include a first flow rate detection unit and a second flow rate detection unit;
when the material flow value in the flow pipeline to be measured is larger than a first preset value, the control unit outputs the flow value detected by the first flow detection unit;
and when the material flow value in the flow pipeline to be measured is less than or equal to a first preset value, the control unit outputs the flow value detected by the second flow detection unit.
Preferably, the first preset value is 80-120g/cm 3 。
Preferably, the at least two flow rate detection units include a first flow rate detection unit and a second flow rate detection unit;
when the void ratio in the flow pipeline to be measured is smaller than a second preset value, the control unit outputs the flow value detected by the first flow detection unit;
and when the void ratio in the flow pipeline to be measured is greater than or equal to a second preset value, the control unit outputs the flow value detected by the second flow detection unit.
Preferably, the second preset value is 85% -95%.
Preferably, the first flow rate detection unit is a solid flow meter, and the second flow rate detection unit is a dilute phase flow meter.
Preferably, a material concentration detection module and a material flow rate detection module are arranged in the solid flow meter, and the control unit is connected with the material concentration detection module and the material flow rate detection module;
and the control unit obtains the void ratio according to the material concentration detected by the material concentration module.
Preferably, the control unit is disposed within the solids flow meter.
On the other hand, the invention adopts the following technical scheme:
a flow measurement method adopts the gas-solid two-phase flow meter to measure the flow of materials in a pipeline.
The invention has the beneficial effects that:
the gas-solid two-phase flow meter provided by the invention is provided with at least two flow detection units packaged in a measuring pipe, and the control unit can select the flow value detected by the corresponding flow detection unit to output according to the material flow parameter in the pipeline output by each detection unit, so that the measuring range and the measuring precision of the flow meter are expanded, and the gas-solid two-phase flow meter is suitable for measuring the flow of the pipeline with larger material flow change.
The flow measuring method provided by the invention adopts the gas-solid two-phase flow flowmeter, has wide measuring range and high measuring precision, and is suitable for measuring the flow of the pipeline with large material flow change.
Drawings
FIG. 1 is a schematic structural diagram of a gas-solid two-phase flow meter installed on a pipeline according to an embodiment of the present invention;
FIG. 2 is a flow chart of a flow measurement method of a gas-solid two-phase flow meter according to an embodiment of the present invention;
fig. 3 is a flow chart of a flow rate testing method of a gas-solid two-phase flow meter according to a second embodiment of the present invention.
In the figure, 1, a solid flow meter; 2. a dilute phase flow meter; 3. a measurement tube; 4. a pipeline.
Detailed Description
The technical scheme of the invention is further explained by the specific implementation mode in combination with the attached drawings.
The first embodiment is as follows:
the embodiment provides a gas-solid two-phase flow meter and a measuring method thereof. The structure of the gas-solid two-phase flow meter is shown in fig. 1, and comprises a measuring pipe 3, a first flow detection unit and a second flow detection unit which are arranged in the measuring pipe 3, and a display unit for displaying the current material flow value. The first flow detection unit and the second flow detection unit both detect the material flow in the pipeline 4.
In this embodiment, the first flow rate detecting unit is a solid flow meter 1, and the second flow rate detecting unit is a dilute phase flow meter 2. The solid flow meter 1 is internally provided with a control unit, and the solid flow meter 1 is used for carrying out corresponding judgment and control operation.
The solid flowmeter 1 adopts an electromagnetic wave measuring technology, is provided with a material concentration detection module and a material flow velocity detection module, obtains the material flow in a pipeline by detecting the concentration and the flow velocity of the material, and has more accurate measured values when the material flow in the pipeline is larger. The dilute phase flowmeter 2 adopts a microwave measuring technology, and the measured value is more accurate when the material flow in the pipeline is small.
As shown in fig. 2, the flow rate measuring method of the gas-solid two-phase flow meter comprises the following steps:
step A, a preset value is prestored in the control unit, and the preset value is a boundary value of the flow measuring ranges of the solid flow meter 1 and the dilute phase flow meter 2. In the present embodiment, the predetermined value is 100g/cm 3 。
And step B, detecting the material flow in the pipeline in real time by the solid flow meter 1 and the dilute phase flow meter 2.
And step C, the control unit judges whether the current flow value detected by the solid flow meter 1 is larger than a preset value, if so, the step D is carried out, and if not, the step F is carried out.
And D, outputting the material flow value detected by the solid flow meter 1 by the control unit, displaying the material flow value on the display unit, and then turning to the step B.
And F, the control unit outputs the material flow value detected by the dilute phase flowmeter 2 and displays the material flow value on the display unit, and then the step B is carried out.
The gas-solid two-phase flow meter provided by the embodiment can make up for the defects in the measurement technology due to the adoption of the two flow detection units, enlarges the measurement range and the measurement precision of the flow meter, and is suitable for measuring the flow of the pipeline with large material flow change.
The number of the flow detection units is not limited to two, even if the number of the flow detection units is two, the flow detection units are not limited to a solid flow meter and a dilute phase flow meter, the flow detection units can be selected according to the specific conditions of the material flow in the pipeline, and the detection precision can be ensured; the preset value pre-stored in the control unit is not limited to 100g/cm 3 Can be set according to the specific model of the flow detection unit, and the preferred range is 80-120g/cm 3 (ii) a The control unit is not limited to be built in the solid flow meter, and one control unit may be separately provided to determine the size and send out the control signal.
Example two:
the embodiment provides a gas-solid two-phase flow flowmeter and a measuring method thereof. The structure of the gas-solid two-phase flow meter is the same as that of the first embodiment, and the gas-solid two-phase flow meter comprises a measuring pipe, a first flow detection unit, a second flow detection unit and a display unit, wherein the first flow detection unit and the second flow detection unit are arranged in the measuring pipe, and the display unit is used for displaying the current material flow value. The first flow detection unit and the second flow detection unit both detect the material flow in the pipeline. The first flow detection unit is a solid flow meter, and the second flow detection unit is a dilute phase flow meter. And a control unit is arranged in the solid flow meter and used for carrying out corresponding judgment and control operation through the solid flow meter. The solid flow meter adopts an electromagnetic wave measuring technology, is provided with a material concentration detection module and a material flow velocity detection module, and obtains the material flow in a pipeline by detecting the concentration and the flow velocity of the material.
The difference is that the flowmeter in the embodiment uses the void ratio of the material in the pipeline as the standard for selecting which flowmeter is used for outputting the flow value. As shown in fig. 3, the flow rate measuring method of the gas-solid two-phase flow meter comprises the following steps:
step A, a preset value is prestored in the control unit, and the preset value is a boundary value of a porosity measurement range of the solid-phase flowmeter and the dilute-phase flowmeter. In this example, the void fraction is 90%.
Step B, detecting the material flow in the pipeline in real time by using a solid flow meter and a dilute phase flow meter; meanwhile, the control unit obtains the void ratio in the pipeline according to the material concentration detected by the material concentration detection module of the solid flow meter.
And C, judging whether the porosity in the pipeline is smaller than a preset value or not by the control unit, if so, turning to the step D, and otherwise, turning to the step F.
And D, outputting the material flow value detected by the solid flow meter by the control unit, displaying the material flow value on the display unit, and then turning to the step B.
And step F, the control unit outputs the material flow value detected by the dilute phase flowmeter, displays the material flow value on the display unit, and then turns to step B.
In the embodiment, the void ratio is taken as a selection standard, and the output flow value is more accurate. The preset value prestored in the control unit is not limited to 90%, and can be set according to the specific type of the flowmeter, and the preferred range is 85% -95%.
The technical principles of the present invention have been described above with reference to specific embodiments. The description is made for the purpose of illustrating the principles of the invention and should not be taken in any way as limiting the scope of the invention. Based on the explanations herein, those skilled in the art will be able to conceive of other embodiments of the present invention without inventive step, and these embodiments will fall within the scope of the present invention.
Claims (8)
1. A gas-solid two-phase flow flowmeter is characterized in that: the device comprises a measuring pipe, at least two flow detection units arranged in the measuring pipe and a control unit connected with the at least two flow detection units; wherein the content of the first and second substances,
the first flow detection unit is a solid flow meter, and the second flow detection unit is a dilute phase flow meter; a material concentration detection module and a material flow rate detection module are arranged in the solid flow meter, and the control unit is connected with the material concentration detection module and the material flow rate detection module;
the control unit is used for selecting the flow value detected by the corresponding flow detection unit to output according to the material flow parameter in the pipeline output by each flow detection unit;
and the control unit obtains the void ratio according to the material concentration detected by the material concentration module.
2. A gas-solid two-phase flow meter according to claim 1, wherein: the material flow parameter is a material flow value or a void ratio in the pipeline.
3. A gas-solid two-phase flow meter according to claim 2, wherein: the at least two flow detection units comprise a first flow detection unit and a second flow detection unit;
when the material flow value in the flow pipeline to be measured is larger than a first preset value, the control unit outputs the flow value detected by the first flow detection unit;
and when the material flow value in the flow pipeline to be measured is smaller than or equal to a first preset value, the control unit outputs the flow value detected by the second flow detection unit.
4. A gas-solid two-phase flow meter according to claim 3, wherein: the first preset value is 80-120g/cm 3 。
5. A gas-solid two-phase flow meter according to claim 2, wherein: the at least two flow detection units comprise a first flow detection unit and a second flow detection unit;
when the void ratio in the flow pipeline to be measured is smaller than a second preset value, the control unit outputs the flow value detected by the first flow detection unit;
and when the void ratio in the flow pipeline to be measured is greater than or equal to a second preset value, the control unit outputs the flow value detected by the second flow detection unit.
6. A gas-solid two-phase flow meter according to claim 5, characterized in that: the second preset value is 85% -95%.
7. A gas-solid two-phase flow meter according to claim 1, wherein: the control unit is disposed within the solids flow meter.
8. A flow measurement method characterized by: the gas-solid two-phase flow meter as defined in any one of claims 1 to 7 is used for measuring the flow rate of the material in the pipeline.
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| CN102889909A (en) * | 2011-07-18 | 2013-01-23 | 青岛科联环保仪器有限公司 | Device and method for measuring gas and solid dual-phase flow |
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| US8011424B2 (en) * | 2005-06-09 | 2011-09-06 | The United States Of America, As Represented By The Secretary Of The Navy | System and method for convective heat transfer utilizing a particulate solution in a time varying field |
| CN1912612A (en) * | 2006-08-15 | 2007-02-14 | 天津工业大学 | Detection method and device of multi-phase matter |
| US8225677B2 (en) * | 2008-11-06 | 2012-07-24 | Northeastern University | Capacitive sensor, system, and method for measuring parameters of a two-phase flow |
| CN101545801B (en) * | 2009-05-08 | 2011-11-16 | 华东理工大学 | Calibration device for solid mass flow meter, using method and system comprising same |
| CN102313684B (en) * | 2010-07-08 | 2013-07-10 | 中国科学院过程工程研究所 | System and method for real-time measurement of gas-solid two-phase flow field |
| CN102322907B (en) * | 2011-05-17 | 2012-10-31 | 重庆梅安森科技股份有限公司 | Integrated intelligent gas flow meter with double flow measuring heads |
| CN103438947B (en) * | 2013-09-05 | 2015-11-18 | 西北工业大学 | Mass of solid particles flow metering device and method in a kind of Dual-Phrase Distribution of Gas olid |
| CN204359373U (en) * | 2015-01-23 | 2015-05-27 | 北京斯威尔工业测量仪器有限公司 | A kind of Dual-Phrase Distribution of Gas olid flowmeter |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102478416A (en) * | 2010-11-30 | 2012-05-30 | 航天长征化学工程股份有限公司 | Gas-solid mixed phase flow flowmeter and flow measuring method |
| CN102889909A (en) * | 2011-07-18 | 2013-01-23 | 青岛科联环保仪器有限公司 | Device and method for measuring gas and solid dual-phase flow |
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