CN105091959A - Focusing hole plate flowmeter and using method thereof - Google Patents
Focusing hole plate flowmeter and using method thereof Download PDFInfo
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Abstract
The invention relates to a focusing hole plate flowmeter, which comprises a hole plate, a front differential pressure transmitter, a rear differential pressure transmitter, a pressure transmitter, a temperature sensor and an on-line flow calculator, wherein the front differential pressure transmitter is arranged on the front end of the hole plate, and measures front and rear differential pressure, the rear differential pressure transmitter is arranged on the rear end of the hole plate, and measures pressure loss value of measured medium after the measured medium passes through the hole plate, the pressure transmitter is arranged on the front end of the hole plate, and measures a pressure value on the front end of the hole plate, the temperature sensor is arranged on the rear end of the hole plate, and the on-line flow calculator is respectively connected with the front differential pressure transmitter, the rear differential pressure transmitter, the pressure transmitter and the temperature sensor. Compared with the prior art, the focusing hole plate flowmeter has the beneficial effects that the focusing hole plate flowmeter can automatically adjust meter factors by adding a pressure measuring point on the rear segment of the hole plate, measuring pressure loss of measured medium and then comparing with a differential pressure value and calculating the change of a differential pressure radio on line.
Description
Technical field
It is more particularly to a kind of to focus on orifice flowmeter and its application method the present invention relates to the field of measuring technique of flow.
Background technology
Widely, it belongs to standard throttle apparatus, it is necessary to design, manufacture, install and use according to standard GB/T/T2624-2006 for standard orifice flow meter application.Standard orifice flow meter has the advantages that simple in construction, durability is good, need not fail to be sold at auction in fact fixed, standardization level is high and the degree of accuracy is higher, in the industrial production using widely.The measurement characteristicses of orifice flowmeter depend on the geometrical property of device, and flow has the relational expression of determination with differential pressure.
Variable beyond differential pressure is regarded as constant by conventional method entirely, last only to determine flow by measuring differential pressure.So when actual variable off-design value, may result in the flow uncertainty of design can not ensure, and is limited in scope due to variable is treated parameter adaptation as constant and causes range ratio very narrow by (3:1).This is the problem of puzzled throttling arrangement is used for a long time.
Simultaneously because often there is passivation phenomenon in the design feature of standard orifice plate, the right-angle side of its upstream orifice.Researcher also studied the measure of some replies, and such as national standard is modified to the efflux coefficient of the standard orifice plate after passivation, and the estimation empirical equation that changes with the time limit of sharpness etc..But, during orifice plate use, because the passivation that cause of reason such as flow-induced corrosion, cavitation erosion and abrasion are to accumulate over a long period and gradually enhanced, this causes orifice plate is long-term to be worked in the case where deviateing the passive state of normal working point, because situation is invisible in pipeline, it is impossible to learn passivation amount, resulting measured value deviation can not be more calculated, actual passivation situation could be obtained exactly when shut-down (breakdown) mainteance, often bring tremendous influence to accurate measurement.
Found in practical application, in the measurement such as natural gas and coal gas, when gas has the solid impurities such as certain dust, orifice plate upstream line can be caused to deposit for a long time.And the geometrical property of orifice plate plumbing installation can be changed by depositing, the discharge relation formula determined between flow and differential pressure will be affected.Orifice plate now more seriously, because fouling status is invisible in pipeline, is unable to find out fault degree, can not more calculate resulting measured value deviation, there is very big hidden danger equivalent to lower work of nonserviceabling for a long time.
When aqueous in the gas of measurement, then just can regard moisture as and flow through, moisture is a kind of two-phase flow of specific form, and this aqueous gas is widely present in industrial processes.Moisture can produce virtual height phenomenon when passing through differential pressure flowmeter, and the accuracy of orifice flowmeter measurement is drastically influence all the time.
Therefore, how to solve a series of problems, such as very narrow standard orifice flow meter range ratio, orifice plate sharp corner passivation, the alluvial of orifice plate upstream and wet gas measurement produce virtual height is a key.
The content of the invention
It is easy to use it is an object of the invention to provide one kind is simple in construction, increase standard orifice flow meter range and the focusing orifice flowmeter for improving Surveying Actual Precision.
To achieve the above object, the present invention is realized using following technical scheme：
One kind focuses on orifice flowmeter, including：
Orifice plate；
Front end differential pressure transmitter, the front end differential pressure transmitter is arranged on differential pressure value before and after orifice plate front end, measuring diaphragm；
Rear end differential pressure transmitter, the front end differential pressure transmitter is arranged on orifice plate rear end, and measurement measured medium passes through the pressure loss value after orifice plate；
Pressure transmitter, the pressure transmitter is installed on orifice plate front end, the pressure value of measuring diaphragm front end；
Temperature sensor, the temperature sensor is arranged on orifice plate rear end；
Online airflow calculator, the online airflow calculator is connected with front end differential pressure transmitter, rear end differential pressure transmitter, pressure transmitter and temperature sensor respectively.
The orifice flowmeter range ratio is 30:1.
A kind of application method for focusing on orifice flowmeter, comprises the following steps：
1）Front end differential pressure transmitter and rear end differential pressure transmitter measure the differential pressure value of orifice plate rear and front end respectivelyAnd value of pressure loss, differential pressure ratio, it is that the value of pressure loss before and after measuring diaphragm is distinguished by front end differential pressure transmitter and rear end differential pressure transmitterCompare differential pressure valueResulting, i.e.,；
2）Online airflow calculator is according to flow equationIn formulaIt is mass flow,、、、、Be respectively efflux coefficient under operating mode, inflatable coefficient, diameter than, the opening size of restricting element and density,It is measurement differential pressure, because the discharge relation formula of throttling arrangement is, two equation simultaneous can be solved, order, then, left side will be moved on on the right side of equation, just constitutes iteration function, take initial value, can calculate, then with shouldIt can be calculated according to different throttling arrangements, then useWithIt can calculateWith, such as twice adjacent calculationIt is sufficiently small, explanationConvergence calculating can terminate, and otherwise useCalculate, then useCalculateWith, this process repeatedly, untilUntill, with meeting errorCalculateJust the influence of Parameters variation is eliminated, to accelerate iterative calculation, whenWhen, using Fast Convergent flat-sawn formula：, conditional parameter, actual measurement process variable and density are actually inserted after throttling arrangement installation, an A is just calculated and rightCarry out an iteration；Per iteration oneCalculate once；Go round and begin again, it is rightRealize in line interation；
3）The radius of the circular arc produced after line airflow calculator is worn according to orifice plate right-angle sideWith orifice plate opening diameterRatio can use differential pressure ratioFunctional form expression, i.e.,：, according in GB/T21446-2008 on orifice plate sharpness correction factorWithRelation table regulation, you can obtain orifice plate sharpness correction factor, the online airflow calculator moment is according to orifice plate sharpness correction factorWith original instrument coefficientProduct, obtains new instrument coefficientk, implement on-line amending；Differential pressure ratioWith orifice plate upstream alluvial degree, whereinIt is orifice plate upstream alluvial cross-sectional area）Existence function relation, i.e.,, the degree while orifice plate depositsTo characterize orifice plate alluvial correction factor, i.e.,, the two, which will be combined, can obtain orifice plate alluvial correction factor, the online airflow calculator moment is according to orifice plate alluvial correction factorWith original instrument coefficientProduct, obtains new instrument coefficientk, implement on-line amending；The virtual height that moisture flows through orifice plate generation can use classical virtual height correction modelRepresent, wherein being most difficult to the L-M parameters of measurementXWith differential pressure ratioExistence function relation, dimensionless amendment virtual height coefficient is can obtain using this relation, when not aqueous by gas, i.e., when humidity is 0, dimensionless amendment virtual height coefficient does not produce influence on instrument coefficient；When moisture by when, according to above-mentioned relation, dimensionless amendment virtual height coefficientChange, the online airflow calculator moment is by original instrument coefficientDivided by dimensionless amendment virtual height coefficient, so as to obtain new instrument coefficientk, implement on-line amending.
Compared with prior art, the beneficial effects of the invention are as follows：
The present invention has simple in construction, it is reasonable in design, it is easy to use, the features such as science is practical, the present invention focuses on orifice plate by way of iterating to calculate online, it is effectively increased standard orifice flow meter range, and pass through the 1 pressure point of straight length increase after orifice plate, measure the crushing of measured medium, it is compared again with differential pressure value, calculated with reference to the change online to differential pressure ratio, can automatic controller coefficient, implement on-line amending, this method can have the present invention to focus on orifice plate itself institute with the voluntarily computing of online airflow calculator simultaneously, without manually simple, and operation time is short.
Brief description of the drawings
Fig. 1 is the structure chart of the present invention.
1-orifice plate, 2-front end, 3-rear end of differential pressure transmitter, 4-pressure transmitter of differential pressure transmitter, 5-temperature sensor 6-online airflow calculator.
Embodiment
The embodiment to the present invention is further illustrated below in conjunction with the accompanying drawings：
As shown in figure 1, a kind of focus on orifice flowmeter, including orifice plate 1；Front end differential pressure transmitter 2, the front end differential pressure transmitter 2 is installed on differential pressure value before and after the front end of orifice plate 1, measuring diaphragm 1（According to the difference of pressure sensor location, corner connection pressure, flange tapping, D-D/2 pressures can be divided into）；Rear end differential pressure transmitter 3, the rear end differential pressure transmitter 3 is arranged on the rear end of orifice plate 1, and measurement measured medium passes through the pressure loss value after orifice plate 1；Pressure transmitter 4, the pressure transmitter 4 is installed on the front end of orifice plate 1, the pressure value of the front end of measuring diaphragm 1；Temperature sensor 5, the temperature sensor 5 is arranged on the rear end of orifice plate 1；Online airflow calculator 6, the online airflow calculator 6 is connected with front end differential pressure transmitter 2, rear end differential pressure transmitter 3, pressure transmitter 4 and temperature sensor 5 respectively.
Above-mentioned orifice flowmeter range ratio is 30:1.
A kind of application method for focusing on orifice flowmeter, comprises the following steps：
1）Front end differential pressure transmitter 2 and rear end differential pressure transmitter 3 measure the differential pressure value of orifice plate rear and front end respectivelyAnd value of pressure loss, differential pressure ratio, it is that the value of pressure loss before and after measuring diaphragm 1 is distinguished by front end differential pressure transmitter 2 and rear end differential pressure transmitter 3Compare differential pressure valueResulting, i.e.,；
2）Online airflow calculator 6 is according to flow equation, in formulaIt is mass flow,、、、、Be respectively efflux coefficient under operating mode, inflatable coefficient, diameter than, the opening size of restricting element and density,It is measurement differential pressure, because the discharge relation formula of throttling arrangement is, two equation simultaneous can be solved, order, then, left side will be moved on on the right side of equation, just constitutes iteration function, take initial value, can calculate, then with shouldIt can be calculated according to different throttling arrangements, then useWithIt can calculateWith, such as twice adjacent calculationIt is sufficiently small, explanationConvergence calculating can terminate, and otherwise useCalculate, then useCalculateWith, this process repeatedly, untilUntill, with meeting errorCalculateJust the influence of Parameters variation is eliminated, to accelerate iterative calculation, whenWhen, using Fast Convergent flat-sawn formula：, conditional parameter, actual measurement process variable and density are actually inserted after throttling arrangement installation, an A is just calculated and rightCarry out an iteration；Per iteration oneCalculate once；Go round and begin again, it is rightRealize in line interation；
3）The radius of the circular arc produced after line airflow calculator 6 is worn according to orifice plate right-angle sideWith orifice plate opening diameterRatio can use differential pressure ratioFunctional form expression, i.e.,：, according in GB/T21446-2008 on orifice plate sharpness correction factorWithRelation table regulation, you can obtain orifice plate sharpness correction factor, the online moment of airflow calculator 6 is according to orifice plate sharpness correction factorWith original instrument coefficientProduct, obtains new instrument coefficientk, implement on-line amending；Differential pressure ratioWith orifice plate upstream alluvial degree, whereinIt is orifice plate upstream alluvial cross-sectional area）Existence function relation, i.e.,, the degree while orifice plate depositsTo characterize orifice plate alluvial correction factor, i.e.,, the two, which will be combined, can obtain orifice plate alluvial correction factor, the online moment of airflow calculator 6 is according to orifice plate alluvial correction factorWith original instrument coefficientProduct, obtains new instrument coefficientk, implement on-line amending；The virtual height that moisture flows through orifice plate generation can use classical virtual height correction modelRepresent, wherein being most difficult to the L-M parameters X and differential pressure ratio of measurementExistence function relation, dimensionless amendment virtual height coefficient is can obtain using this relation, when not aqueous by gas, i.e., when humidity is 0, dimensionless amendment virtual height coefficient does not produce influence on instrument coefficient；When moisture by when, according to above-mentioned relation, dimensionless amendment virtual height coefficientChange, the online moment of airflow calculator 6 is by original instrument coefficientDivided by dimensionless amendment virtual height coefficient, so as to obtain new instrument coefficientk, implement on-line amending.
For wet gas measurement, the amendment of virtual height is more difficult（In the flow regime based on gas phase, the differential pressure value for producing differential pressure flowmeter due to the presence of liquid phase, the gas phase than equivalent is higher when individually flowing through, referred to as virtual height）.The sixties in last century just have researcher to propose classical virtual height correction model：, whereinFor dimensionless amendment virtual height coefficient,For parameter, under different conditions,Value is different,For Lockhart-Martinelli parameters, it is the description carried out from the angle of energy expenditure to liquid phase content, when it can be counted as assuming that gas phase and liquid phase individually flow through pipeline, the dynamic head related to liquid phase component and the square root with the dynamic head ratio of gaseous component correlation, relation i.e. between liquid phase virtual inertia power and gas phase virtual inertia power, show as introducing the amendment of gas-liquid density ratio in form on the basis of mass gas content rate or gas volume fraction, the influence of pressure is embodied.Due in modelIt is extremely complex and be difficult to measure.Found by the early-stage Study of this patent, L-M parametersWith differential pressure ratioExistence function relation, i.e.,：, the virtual height phenomenon progress on-line amending produced when just can be passed through further in accordance with classical virtual height correction model by online airflow calculator 6 to moisture.
The preferred embodiments of the present invention are the foregoing is only, are not intended to limit the invention, for those skilled in the art, the present invention there can be various modifications and variations.Within the spirit and principles of the invention, any modification, equivalent substitution and improvements made etc., should be included in the scope of the protection.
Claims (3)
1. one kind focuses on orifice flowmeter, it is characterised in that including：
Orifice plate；
Front end differential pressure transmitter, the front end differential pressure transmitter is arranged on differential pressure value before and after orifice plate front end, measuring diaphragm；
Rear end differential pressure transmitter, the front end differential pressure transmitter is arranged on orifice plate rear end, and measurement measured medium passes through the pressure loss value after orifice plate；
Pressure transmitter, the pressure transmitter is installed on orifice plate front end, the pressure value of measuring diaphragm front end；
Temperature sensor, the temperature sensor is arranged on orifice plate rear end；
Online airflow calculator, the online airflow calculator is connected with front end differential pressure transmitter, rear end differential pressure transmitter, pressure transmitter and temperature sensor respectively.
2. a kind of focusing orifice flowmeter according to claim 1, it is characterised in that the orifice flowmeter range ratio is 30:1.
3. a kind of application method for focusing on orifice flowmeter according to claim 1, it is characterised in that comprise the following steps：
1）Front end differential pressure transmitter and rear end differential pressure transmitter measure the differential pressure value of orifice plate rear and front end respectivelyAnd value of pressure loss, differential pressure ratio, it is that the value of pressure loss before and after measuring diaphragm is distinguished by front end differential pressure transmitter and rear end differential pressure transmitterCompare differential pressure valueResulting, i.e.,；
2）Online airflow calculator is according to flow equation, in formulaIt is mass flow,、、、、Be respectively efflux coefficient under operating mode, inflatable coefficient, diameter than, the opening size of restricting element and density,It is measurement differential pressure, because the discharge relation formula of throttling arrangement is, two equation simultaneous can be solved, order, then, left side will be moved on on the right side of equation, just constitutes iteration function, take initial value, can calculate, then with shouldIt can be calculated according to different throttling arrangements, then useWithIt can calculateWith, such as twice adjacent calculationIt is sufficiently small, explanationConvergence calculating can terminate, and otherwise useCalculate, then useCalculateWith, this process repeatedly, untilUntill, with meeting errorCalculateJust the influence of Parameters variation is eliminated, to accelerate iterative calculation, whenWhen, using Fast Convergent flat-sawn formula：, conditional parameter, actual measurement process variable and density are actually inserted after throttling arrangement installation, an A is just calculated and rightCarry out an iteration；Per iteration oneCalculate once；Go round and begin again, it is rightRealize in line interation；
3）The radius of the circular arc produced after line airflow calculator is worn according to orifice plate right-angle sideWith orifice plate opening diameterRatio can use differential pressure ratioFunctional form expression, i.e.,：, according in GB/T21446-2008 on orifice plate sharpness correction factorWithRelation table regulation, you can obtain orifice plate sharpness correction factor, the online airflow calculator moment is according to orifice plate sharpness correction factorWith original instrument coefficientProduct, obtains new instrument coefficientk, implement on-line amending；Differential pressure ratioWith orifice plate upstream alluvial degree, whereinIt is orifice plate upstream alluvial cross-sectional area）Existence function relation, i.e.,, the degree while orifice plate depositsTo characterize orifice plate alluvial correction factor, i.e.,, the two, which will be combined, can obtain orifice plate alluvial correction factor, the online airflow calculator moment is according to orifice plate alluvial correction factorWith original instrument coefficientProduct, obtains new instrument coefficientk, implement on-line amending；The virtual height that moisture flows through orifice plate generation can use classical virtual height correction modelRepresent, wherein being most difficult to the L-M parameters of measurementXWith differential pressure ratioExistence function relation, dimensionless amendment virtual height coefficient is can obtain using this relation, when not aqueous by gas, i.e., when humidity is 0, dimensionless amendment virtual height coefficient does not produce influence on instrument coefficient；When moisture by when, according to above-mentioned relation, dimensionless amendment virtual height coefficientChange, the online airflow calculator moment is by original instrument coefficientDivided by dimensionless amendment virtual height coefficient, so as to obtain new instrument coefficientk, implement on-line amending.
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108362343A (en) * | 2018-02-14 | 2018-08-03 | 辽宁聚焦工业流体科学研究院 | Integrated symmetrical flowmeter |
| CN108931270A (en) * | 2018-09-05 | 2018-12-04 | 河北大学 | Diphasic stream parameter detection method based on porous restriction and acoustic emission |
| CN109117579A (en) * | 2018-08-30 | 2019-01-01 | 沈阳云仿科技有限公司 | A kind of design and calculation method of multi-hole orifice flowmeter |
| CN111024170A (en) * | 2019-12-18 | 2020-04-17 | 沈阳鼓风机集团股份有限公司 | Orifice flowmeter |
| CN112525307A (en) * | 2020-11-18 | 2021-03-19 | 苏州热工研究院有限公司 | Online monitoring device and monitoring method for performance of orifice valve |
| CN113108879A (en) * | 2021-04-29 | 2021-07-13 | 青岛市计量技术研究院 | Gas flowmeter for measuring remote calibration of circular-section pipeline and calibration method |
| CN112432675B (en) * | 2020-11-04 | 2023-10-24 | 合肥科迈捷智能传感技术有限公司 | Automatic correction method for zero offset of differential pressure flowmeter based on position sensor |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108362343A (en) * | 2018-02-14 | 2018-08-03 | 辽宁聚焦工业流体科学研究院 | Integrated symmetrical flowmeter |
| CN109117579A (en) * | 2018-08-30 | 2019-01-01 | 沈阳云仿科技有限公司 | A kind of design and calculation method of multi-hole orifice flowmeter |
| CN109117579B (en) * | 2018-08-30 | 2022-12-27 | 沈阳云仿致准科技股份有限公司 | Design calculation method of porous orifice plate flowmeter |
| CN108931270A (en) * | 2018-09-05 | 2018-12-04 | 河北大学 | Diphasic stream parameter detection method based on porous restriction and acoustic emission |
| CN111024170A (en) * | 2019-12-18 | 2020-04-17 | 沈阳鼓风机集团股份有限公司 | Orifice flowmeter |
| CN111024170B (en) * | 2019-12-18 | 2021-09-14 | 沈阳鼓风机集团股份有限公司 | Orifice flowmeter |
| CN112432675B (en) * | 2020-11-04 | 2023-10-24 | 合肥科迈捷智能传感技术有限公司 | Automatic correction method for zero offset of differential pressure flowmeter based on position sensor |
| CN112525307A (en) * | 2020-11-18 | 2021-03-19 | 苏州热工研究院有限公司 | Online monitoring device and monitoring method for performance of orifice valve |
| CN113108879A (en) * | 2021-04-29 | 2021-07-13 | 青岛市计量技术研究院 | Gas flowmeter for measuring remote calibration of circular-section pipeline and calibration method |
| CN113108879B (en) * | 2021-04-29 | 2023-09-29 | 青岛市计量技术研究院 | Gas flowmeter for remotely calibrating circular-section pipeline and calibration method |
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