CN202158878U - Ultrasonic flow measurement device for fuel terminal settlement - Google Patents
Ultrasonic flow measurement device for fuel terminal settlement Download PDFInfo
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- CN202158878U CN202158878U CN2011200993995U CN201120099399U CN202158878U CN 202158878 U CN202158878 U CN 202158878U CN 2011200993995 U CN2011200993995 U CN 2011200993995U CN 201120099399 U CN201120099399 U CN 201120099399U CN 202158878 U CN202158878 U CN 202158878U
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Abstract
本实用新型涉及用于燃油终端结算的超声波流量测量的装置，包括两个或两个以上的独立的飞行时差法超声波测量单元，用于控制各个独立的超声波测量单元的控制电路，以及用于接收各超声波测量单元的测量结果并做进一步分析以计算出流量并将流量输出的上位处理器；其中所述两个或两个以上的独立的超声波测量单元依次串接，通过动态加权平均计算得到最终流量结果，降低时差测量随机误差的影响，提高小容积测量和标定的精度和重复性；各测量管段的直径适当收缩使之小于系统管路口径，提高流体的通过流速和雷诺系数，以改善时差测量的分辨率和流量测量的精度和线性度。
The utility model relates to an ultrasonic flow measurement device for fuel terminal settlement, comprising two or more independent time-of-flight ultrasonic measurement units, a control circuit for controlling each independent ultrasonic measurement unit, and a control circuit for receiving The measurement results of each ultrasonic measurement unit are further analyzed to calculate the flow rate and output the flow rate to the upper processor; wherein the two or more independent ultrasonic measurement units are connected in series in sequence, and the final result is obtained through dynamic weighted average calculation. Flow results, reduce the impact of random errors in time difference measurement, improve the accuracy and repeatability of small volume measurement and calibration; the diameter of each measurement pipe section is properly shrunk to make it smaller than the system pipe diameter, and increase the flow rate and Reynolds coefficient of the fluid to improve time difference The resolution of the measurement and the accuracy and linearity of the flow measurement.
Description
Technical field
The utility model relates to a kind of device of measuring the volumetric flow rate of liquid fuel, specifically, relates to and is used to improve the precision stability of fuel oil volume flow measurement and the device of system reliability.
Background technology
The measuring ultrasonic wave flow technology is one of flow measuring and controlling field technology with fastest developing speed in recent years, and outstanding feature is that its technology is expanded to high precision and Trade Measures direction from general process control and water treatment applications.In the Trade Measures of rock gas and oils product; Adopted device for measuring ultrasonic wave flow more and more widely in the large diameter pipeline delivery application more than the DN100mm, the research of using the high-precision ultrasonic flow measurement in the more small-bore fuel metering clearing has also begun to become frontline technology.The great advantage of device for measuring ultrasonic wave flow is not have mechanical moving element, and it is little to wear and tear, and long-term precision stability is fine, and flow resistance is little, conserve energy.The subject matter that device for measuring ultrasonic wave flow is run in actual Trade Measures is used is that the measured flux process that needs is bigger than length or volume; Be inappropriate for the big and demarcation volume smaller applications object of metered flow pulsation, relevant foreign standard has relaxed the requirement that the minimum volume of ultrasonic flow metering device is demarcated for this reason especially.In small-bore fuel oil terminal settlement device commonly used, because the own industrial nature that flow pulsation and small size are demarcated needs the response speed of measuring ultrasonic wave flow and the ability that suppresses randomness that further raising is arranged.
The major advantage of measuring ultrasonic wave flow is to accomplish not having direct contact, and flow resistance is little, and the measurement flow rate scope is big, the long-term accuracy good stability, safeguard few, use flexibly and the life-span long etc.Particularly in corrosivity; Has the incomparable advantage of other flow measurement technology in the application of non conducting fluid and larger caliber pipeline especially; Along with developing rapidly, integrated circuit technique begins to be used widely in recent years; Become fastest-rising a kind of technology in the flow measurement field, and the trend that replaces other kind flowmeter is arranged in plurality of applications.To be used for water and sewage be master's application scenario to ultrasonic flow meter more in the past, and accuracy requirement is relatively low with stability, technical development to the beginning of this century oil and gas industry begin to accept ultrasonic flow meter comprehensively and passed through a series of industry standards in the recent period.Enforcement along with development of technology and relevant criterion; The application of high-precision ultrasonic flow measurement obtains fast development; Ultrasonic gas flowmeter has become the preferred option of rock gas main conduit and gauze Trade Measures, in the pipeline transportation of oils liquid and Trade Measures, also begins to adopt in a large number the high-precision ultrasonic flow measurement device.
Because the requirement of pipeline economy, the detected fluid in most practical applications is in disturbed flow condition, and the flow velocity of instantaneous ultrasonic measurement has very big randomness.Existing high-precision ultrasonic flow measurement device be to gas or the application of liquid all adopted multichannel (general three more than the sound channel) bar none, based on the technical scheme of jet lag method; The technical barrier that solves also is common, that is: the randomness of instantaneous flight time measurement and to the compensation of the flow rate calculation of flow velocity distribution field.Its bore of fuel oil for vehicles settlement terminal equipment for commonly used is generally DN20 and DN35; Design multiple tracks ultrasonic sensor can't be realized because of there being the restriction in the mechanical dimension on same pipeline section; Because pipe diameter causes effective ultrasound wave sound channel length less for a short time, more be unfavorable for inhibition on the other hand, directly use to tubule and occurred making pipe bending and the sonic propagation direction device parallel with fluid flow direction to transient measurement randomness; Often become U-shaped pipe or π shape pipe; Shown in accompanying drawing 1, effective ultrasound wave sound channel length of this device increases greatly, and the randomness that instantaneous velocity is measured also is able to reduce; But experiment and theoretical analysis show; Because there are contradiction in the restriction effective ultrasound wave sound channel length L of acoustic wave propagation velocity and the response speed of system, single U-shaped pipe or π shape pipe unit still can't satisfy the flow measurement requirement of fuel oil settlement terminal, and pressure fluctuation and local bubble common in fuel oil settlement terminal device also can produce very big influence to measuring.
The higher measuring ultrasonic wave flow of general precision is based on the ultimate principle of jet lag method, and its expression formula commonly used is:
Wherein: V is the sound channel flow velocity that calculates, and C is the velocity of sound of fluid, and L is effective sound channel length, and Δ T is that the acoustic transit time of following current and adverse current is poor, i.e. jet lag.The sound channel flow velocity here is the flow field storage effect along sound channel of directly directly being derived by jet lag; Generally speaking and be not equal to the mean flow rate in flowing pipe road, the relation of sound channel flow velocity and mean flow rate and sound channel design, fluid state and velocity flow profile all have relation.Like Fig. 2, shown in 3, a is the original state district, and B is turbulent distribution zone of transition, and y1 is theoretical turbulent distribution curve, and y2 is theoretical laminar flow distribution curve, because the economy requirement of pipe design, the fluid in most the application is in disturbed flow condition.Turbulent flow rate in the closed conduct distributes and can be expressed as:
Wherein: V (r) is that the arbitrfary point is apart from the fluid velocity at pipeline center r place in the velocity field, and Vc is pipeline center's fluid velocity, and R is the pipeline radius, and N is the characteristic parameter of velocity flow profile curved surface.
Analyze theoretically, mean flow rate Vavg is the integration on whole pipelines interface
What flow measurement device ultimate demand obtained is fluid flow:
Wherein: F is the calculated flow value, the fctr coefficient be one with the relevant function of Flow Field Distribution characteristic parameter N.
Formula (1)-(4) pairing computing method; Be in the prior art normal use; Prerequisite is that the turbulent flow that will reach development fully distributes, and this need guarantee that generally there is the collimation pipeline of diameter more than 10 times at the upper reaches, and there is the collimation pipeline of diameter more than 5 times in downstream; As shown in Figure 2, the flow field needs just to reach the theoretical turbulent flow of development fully through turbulent transition period after by disturbance and distributes.Even in the U-shaped tubular construction, can satisfy above requirement at local pipeline; Because the bent tube section fluid of front and back is to guarantee that the turbulent flow that develops fully distributes in most of pipeline section position; As shown in Figure 4, the turbulent flow that in the very long distance of fluid inflow and outflow U-shaped tubular construction, can not reach symmetry distributes.In sum; Distribute desirable turbulent flow to try to achieve the fctr coefficient be to adapt to the crooked restriction of actual pipeline section with the method that obtains flow for the velocity flow profile eigenwert that draws to suppose, in most actual measurement processes, will obtaining accurately on the other hand, fluid density and viscosity information also are unpractical to obtain accurate Reynolds number.
The utility model content
The purpose of the utility model is in small-bore pipeline, to use existing technical matters in order to overcome above-mentioned measuring ultrasonic wave flow technology; Be provided for the device of the measuring ultrasonic wave flow of fuel oil terminal clearing; To improve the stability and the response speed of measuring system; Finally improve the precision and the repeatability of little volumetric measurement and demarcation, reach the technical requirement of fuel oil settlement terminal.
The utility model adopts following technical scheme to realize above-mentioned purpose: the device that is used for the measuring ultrasonic wave flow of fuel oil terminal clearing; Comprise two or more independently ultrasonic measurements unit; Be used to control each independently control circuit of ultrasonic measurement unit, and be used to receive the measurement result of each ultrasonic measurement unit and do further analysis to calculate flow and with the Upper Processor of flow output; Wherein said two or more independently ultrasonic measurements unit is connected in series successively, makes formed whole ultrasonic wave duct road, serial connection back be serpentine.
Said each ultrasonic measurement unit comprises a pair of ultrasonic sensor, a band bend pipe and is provided with measurement pipeline section, the electronic installation of ultrasonic sensor installation site; The measurement pipeline section and the flow gateway of each ultrasonic measurement unit are serpentine, and the inlet bend pipe of promptly measuring pipeline section and outlet bend pipe be symmetry but bending direction is opposite structurally, and the inlet bend pipe keeps at grade with the axis of outlet bend pipe.
The measurement pipeline section diameter of said each ultrasonic measurement unit is equal to or less than the pipeline bore of fuel oil terminal settlement system, to improve rate of flow of fluid and Reynolds coefficient.
Said ultrasonic sensor is installed on the said measurement pipeline section; And the face-to-face collimation of ultrasonic sensor, the axis of sonic propagation and the dead in line of measuring the pipeline section straight line portion.
Compared with prior art, the utlity model has following advantage and beneficial effect:
1, use a plurality of independently ultrasonic measurements unit, the turbulent flow that can reduce non-development fully distributes to the influence of fctr coefficient, reduces the randomness that jet lag is measured, and has improved accuracy of measurement system and reliability.
2, in each ultrasonic measurement unit all during operate as normal; Measurement result to all unit is carried out weighted mean; The instantaneous accidental that can reduce to measure single ultrasonic measurement unit fluctuates; Under the requirement that reaches the identical random fluctuation width of cloth, reduce the instrument ratio of damping, thereby improve the time response velocity fails of measuring system.The selection of weighting coefficient can be according to the concrete design decision of ultrasonic signal quality or each ultrasonic measurement unit.When normally moving, each ultrasonic measurement unit can all weighting coefficients be changed to 1 for being combined in of identical independently ultrasonic measurement unit.
3, the following current of single ultrasonic measurement unit and the signal of adverse current Time delay measurement transmit and receive and can carry out simultaneously, thereby have improved the response speed of system.Sound wave comes and goes the travel-time that propagation need be directly proportional with sound channel length in fluid; Each ultrasonic measurement unit carries out analytical calculation to ultrasonic signal also needs time enough; These two times with the fastest response time that has determined the ultrasonic measurement unit; Can know that according to the analysis of front sound channel length is longer to the resolution measured and favourable more to compacting transient measurement randomness; But this contradicts with the requirement that reduces the single measurement time, carries out following current simultaneously with the adverse current Time delay measurement has been saved half travel-time, has reached the purpose of raising system response time.Can improve measurement flow pulsation and, improve the repeatability of little volumetric calibration through the response speed that improves the measuring ultrasonic wave flow system, the meaning of particular importance is arranged in the application of small-bore fuel oil terminal clearing in the measuring accuracy of measuring on the little volume applications.
4, a plurality of independently ultrasonic measurements of Upper Processor management unit can make system that abundant diagnostic function and strong adaptability are arranged;, improper difference can confirm unusual ultrasonic measurement unit when appearring in each ultrasonic measurement unit through the system redundancy evaluation algorithm; Get rid of abnormal results; The generating process of diagnosing abnormal situation; Guarantee overall measurement result's reliability, for example as than air pocket or trash flow is out-of-date can judge problem in proper order through the measurement actual effect of each ultrasonic measurement unit.
5, enriching diagnostic function and can occur in indivedual ultrasonic measurement unit reporting to the police and record when unusual according to redundant system; And according to the unusual order of severity decision works on or quits work; This has important meaning to fuel oil terminal checkout apparatus, reduces the risk of wrong metering.
Description of drawings
Fig. 1 is U-shaped pipe commonly used or π shape pipe synoptic diagram.
Fig. 2 is for showing the evolution synoptic diagram of the velocity flow profile that turbulent flow distributes.
Fig. 3 is for showing the randomness of ultrasound wave transient measurement in turbulent flow in the actual measurement process; The scope that has contrasted instantaneous fluctuation immediately among the figure with reach the comparison of the fluctuation range of precision stability, can find out need be bigger ratio of damping just can obtain than the stable flow rate value.
Fig. 4 arranges the synoptic diagram of the velocity flow profile asymmetry that causes for showing bend pipe commonly used.
Fig. 5 is in the utility model measurement mechanism, a kind of way of realization of ultrasonic measurement unit, and wherein the inlet bend pipe of pipeline section is opposite with the bending direction of outlet bend pipe, and near the velocity flow profile asymmetry of bend pipe is cancelled out each other to the influence of ultrasonic measurement.
Fig. 6 is a kind of implementation structure sectional view of Fig. 5, and has shown the caliber contraction structure of measuring pipeline section, and 61,62 is that ultrasonic sensor is right among the figure, and 62 for measuring straight length, and 63 are caliber contraction and fluid rectification zone.
Fig. 7 is a kind of implementation of the utility model measurement mechanism, the serial connection synoptic diagram of a plurality of independently ultrasonic measurements unit, and wherein each ultrasonic measurement cellular construction is identical, and the system pipeline entrance and exit is on same axis.
Fig. 8 is in the utility model measurement mechanism, a kind of way of realization of the functional module of circuit hardware.
Fig. 9 is in the utility model measuring method, a kind of way of realization of the system control program flow process of Upper Processor.
Embodiment
Below in conjunction with accompanying drawing, the utility model is elaborated with a kind of preferred embodiment.The combination embodiment that multiple sensors, pipeline section structure and hardware-software can also be arranged in not exceeding the innovation scope of the utility model.
Embodiment
Referring to Fig. 5-8; The utility model is used for the device of the measuring ultrasonic wave flow of fuel oil terminal clearing; Comprise following structure: two or more independently ultrasonic measurements unit; Be used to control each independently control circuit of ultrasonic measurement unit, and be used to receive the direct measurement result of each ultrasonic measurement unit and do further analysis to calculate flow and with the Upper Processor of flow output; Wherein said two or more independently ultrasonic measurements unit is connected in series successively, make formed whole ultrasonic wave duct road, serial connection back be serpentine, thereby the distortion that the distribution of ultrasound wave pipe bending semiconvection speed is produced can major part be cancelled out each other.The frequency of operation of each ultrasonic measurement unit can be identical, also can and different.Each ultrasonic measurement unit comprises a pair of ultrasonic sensor (as shown in Figure 6 61,62), a band bend pipe and is provided with measurement pipeline section 63, the electronic installation of sensor installation site; The measurement pipeline section and the flow gateway of each ultrasonic measurement unit are serpentine; The inlet bend pipe of promptly measuring pipeline section and outlet bend pipe be symmetry but bending direction is opposite structurally; The inlet bend pipe still keeps at grade with the axis of outlet bend pipe; The two ends of measuring pipeline section 63 are that caliber shrinks and fluid commutating zone 64, like Fig. 5, shown in 6.What each ultrasonic measurement unit was measured is whole flows.Wherein electronic installation comprises electronic circuit board and control operational software; The measurement pipeline section diameter of ultrasonic measurement unit is equal to or less than the pipeline bore of fuel oil terminal settlement system, and is as shown in Figure 7, to improve the partial fluid flow velocity, promptly improves the Reynolds number of detected fluid, reduces the uncertainty that turbulent flow distributes.Ultrasonic sensor is installed on the measurement pipeline section of said ultrasonic measurement unit, and the face-to-face collimation of ultrasonic sensor, the axis of sonic propagation and the dead in line of measuring the pipeline section straight line portion.
As shown in Figure 7; In the present embodiment; The utility model device adopts three independently ultrasonic measurement unit; And with three independently the ultrasonic measurement unit be connected in series, the measurement pipeline section diameter of ultrasonic measurement unit is about 2/3rds of system pipeline bore, is 2 times of common pipeline flow velocity thereby make the measurement pipeline section flow velocity of ultrasonic measurement unit.Three ultrasonic measurement cellular constructions are identical in this specific embodiments, thereby help part-subassemble standardization, and the measurement pipeline section of three ultrasonic measurement unit is concatenated into the revolution shape and helps saving installing space.The design of bend pipe in the present embodiment makes the interface of main entrance and general export on same axis; Such layout helps the encapsulation of system; In practical application, help in system pipeline, assembling, but the interface of main entrance and general export does not deviate from the characteristic of the utility model yet on same axis.
It is many to ultrasonic sensor that the utility model uses, and every pair of ultrasonic sensor straight line is to looking; Sound channel is passed the axis of the pipeline of ultrasonic measurement unit, and is parallel with the flow velocity direction.The sound channel flow velocity V that is directly calculated by jet lag can be approximated to be center flow velocity Vc, and flow rate calculation can be reduced to like this:
Velocity flow profile characteristic parameter N is relevant with the Reynolds number of fluid:
Wherein: Re is a Reynolds number, and ρ is a fluid density, and V is a rate of flow of fluid, and D is a pipe diameter, and μ is a fluid viscosity.
Turbulent flow distribution for development fully generally can use following experimental formula to draw the velocity flow profile eigenwert:
N＝1.66*log(Re) (7)
The electronic circuit board of said ultrasonic measurement unit and the Upper Processor circuit board of system all place same electronics machine box; Thereby can install concentratedly; Reach the jamproof requirement of electronic circuit easily, help that more whole fuel metering system is carried out anti-explosion safety and isolate.
The ultrasonic sensor of said three ultrasonic measurement unit adopts different frequency, can further reduce the ultrasound wave interference that random propagation is caused other ultrasonic measurement unit in pipeline; But each ultrasonic sensor uses the embodiment of same frequency also not deviate from the characteristic of the utility model.Because the direct contact liq of above-mentioned ultrasonic sensor for the above-mentioned ultrasonic sensor of the application requirements that adapts to most of petrochemical complex classes adopts the Sefe antiexplosion design, but does not use the embodiment of explosion-proof design not deviate from the characteristic of the utility model yet.
The control operational software of above-mentioned each ultrasonic measurement unit is an independent operating, with measurement result and quantity of state gather to Upper Processor software to carry out overall status and judge and to calculate; And the instruction of reception Upper Processor software, transmitting and receiving of control ultrasonic signal handles receiving signal, and calculation flow rate distribution parameter and mean flow rate are to Upper Processor software send state information and result of calculation.As shown in Figure 8, the major function of Upper Processor software is a control multiplex ultrasonic system, realizes flow algorithm and system state intelligent decision that multichannel is redundant, to upper strata metering system transmitted traffic information and status information; The recording exceptional situation of taking the necessary measures when unusual is taking place, and reports to the police or ends the ultrasonic system operation.The control operational software of ultrasonic measurement unit and Upper Processor software are the differentiations on the function; On the physical load mode can be to be embedded on the discrete separately circuit board; Can be on the different processor that is embedded on the same circuit board; Can be the program that is embedded in the multithreading operation on the same processor, above software loading mode deviate from the characteristic of the utility model yet.
The utility model records measurement result separately based on the method for the measuring ultrasonic wave flow that is used for the clearing of fuel oil terminal of said apparatus respectively by each ultrasonic measurement unit; Each ultrasonic measurement unit carries out the flow measurement of jet lag method independently of each other, and the measurement result that records is pooled to Upper Processor respectively; Upper Processor adopts system redundancy and state evaluation algorithm to calculate final flow, and improper situation is reported to the police.
Wherein, as shown in Figure 9, said system redundancy and state evaluation algorithm may further comprise the steps successively:
A, each ultrasonic measurement unit transmit and receive ultrasonic signal respectively, and the independent interior flow rate of liquid of jet lag method computer tube that uses;
B, Upper Processor are collected the multiplex ultrasonic metrical information;
C, Upper Processor diagnostic system state;
D, when Upper Processor diagnosis draws system state just often, to the measurement result weight of a plurality of ultrasonic measurements unit, calculate mean flow rate Vavg and flow F, integrated flow obtains transmitting volume again; When diagnosis draws system state is that indivedual ultrasonic measurements unit is accidental when unusual, to the measurement result weight of good ultrasonic measurement unit, calculates Vavg and F, adds up volumetric flow rate again, gives a warning and recording exceptional information; Last Upper Processor transmits result of calculation and state parameter to the metering mainboard; Wherein, Vavg is a mean flow rate, and F is a flow;
E, when Upper Processor diagnosis draws system state and is severely subnormal, stop to calculate and keep accumulative total volumetric flow rate information, and recording exceptional information, saved system information; End ultrasonic measurement then, and report to the police to the metering mainboard.
The foregoing description is the utility model preferred implementation; But the embodiment of the utility model is not restricted to the described embodiments; Other any do not deviate from change, the modification done under spirit and the principle of the utility model, substitutes, combination, simplify; All should be the substitute mode of equivalence, be included within the protection domain of the utility model.
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| CN2011200993995U CN202158878U (en) | 2011-04-07 | 2011-04-07 | Ultrasonic flow measurement device for fuel terminal settlement |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102207398A (en) * | 2011-04-07 | 2011-10-05 | 托肯恒山科技（广州）有限公司 | Ultrasonic flow measurement device and method for fuel terminal settlement |
| CN107340022A (en) * | 2017-08-29 | 2017-11-10 | 中国计量大学 | Ultrasonic Wave Flowmeter |
| CN109425399A (en) * | 2017-08-25 | 2019-03-05 | 罗凡 | Coriolis mass flowmeters and its sensor module |
| CN109425396A (en) * | 2017-08-25 | 2019-03-05 | 罗凡 | Coriolis mass flowmeters and its sensor module |
| CN109425395A (en) * | 2017-08-25 | 2019-03-05 | 罗凡 | Coriolis mass flowmeters and its sensor module |
| CN111024168A (en) * | 2019-11-28 | 2020-04-17 | 上海埃科燃气测控设备有限公司 | Anti-theft gas system and gas ultrasonic flowmeter for ultrasonic detection and measurement device |
-
2011
- 2011-04-07 CN CN2011200993995U patent/CN202158878U/en not_active Expired - Lifetime
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102207398A (en) * | 2011-04-07 | 2011-10-05 | 托肯恒山科技（广州）有限公司 | Ultrasonic flow measurement device and method for fuel terminal settlement |
| CN102207398B (en) * | 2011-04-07 | 2013-06-12 | 托肯恒山科技（广州）有限公司 | Ultrasonic flow measurement device and method for fuel terminal settlement |
| CN109425399A (en) * | 2017-08-25 | 2019-03-05 | 罗凡 | Coriolis mass flowmeters and its sensor module |
| CN109425396A (en) * | 2017-08-25 | 2019-03-05 | 罗凡 | Coriolis mass flowmeters and its sensor module |
| CN109425395A (en) * | 2017-08-25 | 2019-03-05 | 罗凡 | Coriolis mass flowmeters and its sensor module |
| CN109425396B (en) * | 2017-08-25 | 2023-10-27 | 罗凡 | Coriolis mass flowmeter and sensor assembly therefor |
| CN109425395B (en) * | 2017-08-25 | 2024-02-13 | 罗凡 | Coriolis mass flowmeter and sensor assembly therefor |
| CN109425399B (en) * | 2017-08-25 | 2024-02-20 | 罗凡 | Coriolis mass flowmeter and sensor assembly therefor |
| CN107340022A (en) * | 2017-08-29 | 2017-11-10 | 中国计量大学 | Ultrasonic Wave Flowmeter |
| CN111024168A (en) * | 2019-11-28 | 2020-04-17 | 上海埃科燃气测控设备有限公司 | Anti-theft gas system and gas ultrasonic flowmeter for ultrasonic detection and measurement device |
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