CN106225857A - A kind of current-sharing Combined type venturi tube apparatus for measuring air quantity - Google Patents

A kind of current-sharing Combined type venturi tube apparatus for measuring air quantity Download PDF

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Publication number
CN106225857A
CN106225857A CN201610876982.XA CN201610876982A CN106225857A CN 106225857 A CN106225857 A CN 106225857A CN 201610876982 A CN201610876982 A CN 201610876982A CN 106225857 A CN106225857 A CN 106225857A
Authority
CN
China
Prior art keywords
venturi tube
homogenizing plate
measurement apparatus
current
air quantity
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN201610876982.XA
Other languages
Chinese (zh)
Inventor
刘大猛
石践
席光辉
石航
陈玉忠
周科
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Electric Power Research Institute of Guizhou Power Grid Co Ltd
Original Assignee
Electric Power Research Institute of Guizhou Power Grid Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Electric Power Research Institute of Guizhou Power Grid Co Ltd filed Critical Electric Power Research Institute of Guizhou Power Grid Co Ltd
Priority to CN201610876982.XA priority Critical patent/CN106225857A/en
Publication of CN106225857A publication Critical patent/CN106225857A/en
Pending legal-status Critical Current

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Classifications

    • GPHYSICS
    • G01MEASURING; TESTING
    • G01FMEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F1/00Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
    • G01F1/05Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using mechanical effects
    • G01F1/34Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using mechanical effects by measuring pressure or differential pressure
    • G01F1/36Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using mechanical effects by measuring pressure or differential pressure the pressure or differential pressure being created by the use of flow constriction
    • G01F1/40Details of construction of the flow constriction devices
    • G01F1/44Venturi tubes
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01FMEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F15/00Details of, or accessories for, apparatus of groups G01F1/00 - G01F13/00 insofar as such details or appliances are not adapted to particular types of such apparatus
    • G01F15/10Preventing damage by freezing or excess pressure or insufficient pressure

Abstract

The invention discloses a kind of current-sharing Combined type venturi tube apparatus for measuring air quantity, including measurement apparatus body 1, Venturi tube 2 and front homogenizing plate 4, it is characterized in that: in described current-sharing Combined type venturi tube apparatus for measuring air quantity body 1, Venturi tube 2 is installed, front homogenizing plate 4 and rear homogenizing plate 5, measurement apparatus body 1 top position is provided with malleation pressure pipe 7 and negative pressure taking pressure pipe 8, technical scheme is used to solve traditional universal compact in design of boiler air duct, apparatus for measuring air quantity is caused to be installed limited, before and after air channel needed for measurement apparatus, straight length is discontented with the installation requirement of measurement apparatus, elbow is many and straight length is little causes the unequal measurement result causing measurement apparatus of air duct flow field to fluctuate big, poor stability, measurement data is inaccurate, air measuring problem especially for coal pulverizer inlet air channel.

Description

A kind of current-sharing Combined type venturi tube apparatus for measuring air quantity
Technical field
The present invention relates to a kind of power boiler air capacity measuring apparatus, be specifically related to a kind of current-sharing Combined type venturi tube air quantity Measurement apparatus, belongs to field of electrical equipment.
Background technology
Along with current thermal power generation unit develops to Large Copacity, high parameter direction, system is more complicated, coordinates air quantity accurate The requirement of the air channel reasonable Arrangement measured is increasingly difficult to meet, owing to boiler first and second air channel structure is by equipment installation, place The factor impacts such as layout, the forward and backward straight length in major part air measuring cross section is limited, and air flow method is uneven, and flow field is largely On deviate from the condition that air quantity is accurately measured, cause that the data fluctuations measured by apparatus for measuring air quantity is big, poor stability, the most right Boiler combustion has the coal pulverizer inlet air measuring of considerable influence, and the unstability of measurement result will have a strong impact on boiler combustion certainly Dynamic and coal pulverizer the most reliably puts into.
The universal compact in design of traditional boiler air duct, causes apparatus for measuring air quantity to be installed limited, the wind needed for measurement apparatus Before and after road, straight length is discontented with the installation requirement of measurement apparatus, and elbow is many and straight length is little causes that air duct flow field is unequal causes measurement The measurement result fluctuation of device is big, poor stability, measurement data are inaccurate, especially for the air measuring in coal pulverizer inlet air channel Problem becomes apparent from.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of current-sharing Combined type venturi tube apparatus for measuring air quantity, solves to pass The universal compact in design of boiler air duct of system, causes apparatus for measuring air quantity to be installed limited, straight tube before and after the air channel needed for measurement apparatus The installation requirement of Duan Buman measurement apparatus, elbow is many and straight length is little causes the unequal measurement causing measurement apparatus of air duct flow field Result fluctuation is big, poor stability, measurement data are inaccurate, especially for the air measuring problem in coal pulverizer inlet air channel.
The technical scheme that the present invention takes is a kind of current-sharing Combined type venturi tube apparatus for measuring air quantity, including measurement apparatus Body, Venturi tube and front homogenizing plate, described current-sharing Combined type venturi tube apparatus for measuring air quantity is the most internal is provided with literary composition mound In manage, front homogenizing plate and rear homogenizing plate, measurement apparatus body top position is provided with malleation pressure pipe and negative pressure taking pressure pipe.
Described measurement apparatus body cross-section is square or circular.
There are uniform perforate, front homogenizing plate and edge, rear homogenizing plate cross section in described front homogenizing plate and rear homogenizing plate cross section This is internal to be arranged on measurement apparatus before and after pipeline fluid flow direction, and outer ring, homogenizing plate cross section is close with measurement apparatus inner body wall Envelope is installed.
Described Venturi tube is arranged between front homogenizing plate and rear homogenizing plate, Venturi tube 2 front/rear end and front current-sharing Plate and rear homogenizing plate cross section seal installs, and has through hole, Venturi tube quantity to open with homogenizing plate cross section at venturi throat Hole number is consistent, and the specification of each Venturi tube is the most identical.
Described malleation pressure pipe passes measurement apparatus body outer wall, and punch position is in front homogenizing plate front end measurement apparatus originally Middle position directly over body.
Described negative pressure taking pressure pipe passes measurement apparatus body outer wall, and perforation is surveyed between front homogenizing plate and rear homogenizing plate Amount device body top center position.
Utilizing technical scheme, no matter the wind pipeline of production scene how layout, this measurement apparatus is without producing The installation requirement of straight length before and after scene is satisfied, airduct layout is the least on the impact of this measurement apparatus, and before and after utilization, homogenizing plate enters After row current-sharing, the fluidic layout formed in measurement apparatus is uniform, the pressure differential acquired by malleation pressure pipe and negative pressure taking pressure pipe Stable.The present invention has the Flow Field Distribution making higher level complicated, is obtained in that flowing is stable, simple after forward and backward homogenizing plate processes The feature in subordinate flow field, this device significantly improves accuracy and the reliability of pulverized coal preparation system air measuring, for boiler combustion The most reliable input provides necessary basis.
The measurement apparatus body cross-section of the present invention is square or circular, it is simple to and the pipeline of production scene achieves a butt joint peace Dress.
There are uniform perforate, front homogenizing plate and rear homogenizing plate cross section in the front homogenizing plate of the present invention and rear homogenizing plate cross section This is internal to be arranged on measurement apparatus before and after pipeline fluid flow direction, outer ring, homogenizing plate cross section and measurement apparatus inner body wall Seal and install, utilize homogenizing plate that complicated fluid condition is become the most even stable, finally realize measurement data stable.
The Venturi tube of the present invention is arranged between front homogenizing plate and rear homogenizing plate, Venturi tube 2 front/rear end with front all Stream plate and rear homogenizing plate cross section seal installs, and has through hole, Venturi tube quantity and homogenizing plate cross section at venturi throat The number of openings is consistent, and the specification of each Venturi tube is the most identical, and the later fluid of homogenizing plate current-sharing is all through venturi Guan Hou, forms a stable negative pressure taking pressure ring border, it is simple to the pressure of negative pressure taking pressure pipe between front homogenizing plate and rear homogenizing plate.
The malleation pressure pipe of the present invention passes measurement apparatus body outer wall, and punch position is in front homogenizing plate front end measurement apparatus Middle position directly over body, it is ensured that malleation pressure pipe pressure sensor location is not easily blocked.
The negative pressure taking pressure pipe of the present invention passes measurement apparatus body outer wall, and perforation is between front homogenizing plate and rear homogenizing plate Measurement apparatus body top center position, forms an environment sealed, Venturi tube between front homogenizing plate and rear homogenizing plate The perforate of throat position gas is filled up this space, in the perforate of conduit upper middle position, it is ensured that pressure point pressure is steady Fixed, without stopping states such as hydrops.
Use technical scheme can solve the universal compact in design of traditional boiler air duct, cause apparatus for measuring air quantity Installing limited, before and after the air channel needed for measurement apparatus, straight length is discontented with the installation requirement of measurement apparatus, and elbow is many and straight length is little Cause that the unequal measurement result fluctuation causing measurement apparatus of air duct flow field is big, poor stability, measurement data are inaccurate, especially pin Air measuring problem to coal pulverizer inlet air channel.
Accompanying drawing explanation
Fig. 1 is present configuration principle schematic;
Fig. 2 is homogenizing plate cross-sectional figure of the present invention;
Fig. 3 is Venturi tube and the scheme of installation of homogenizing plate of the present invention;
Fig. 4 is venturi tube structure schematic diagram of the present invention;
Shown in figure it is: 1, measurement apparatus body, 2, Venturi tube, 3, negative pressure pressure chamber, 4, front homogenizing plate, 5, rear current-sharing Plate, the 6, second air channel, 7, malleation pressure pipe, 8, negative pressure taking pressure pipe, the 9, first air channel, 2-1 venturi throat perforate, 4-1, all Stream plate perforate.
Detailed description of the invention
Describe the preferred embodiments of the present invention below in conjunction with the accompanying drawings in detail.
As shown in figures 1-4, a kind of current-sharing Combined type venturi tube apparatus for measuring air quantity, including measurement apparatus body 1, literary composition Venturi 2, negative pressure pressure chamber 3, front homogenizing plate 4, rear homogenizing plate the 5, second air channel 6, malleation pressure pipe 7, negative pressure taking pressure pipe 8 and First air channel 9, be provided with in current-sharing Combined type venturi tube apparatus for measuring air quantity body 1 Venturi tube 2, front homogenizing plate 4 and after Homogenizing plate 5, measurement apparatus body 1 top position is provided with malleation pressure pipe 7 and negative pressure taking pressure pipe 8.
During test, select this measurement apparatus of Pipe installing of a circular duct, first select according to on-site actual situations The quantity of Venturi tube, determines the perforate 4-1 quantity of before and after's homogenizing plate, perforate 4-1 number further according to the quantity of Venturi tube 2 Measuring consistent with Venturi tube 2 quantity, the technical program includes the Venturi tube 2 of at least 3 or more than 3, front homogenizing plate 4 He After the perforate of rear homogenizing plate 5 terminates, Venturi tube 2 carrying out in throat position perforate, perforate size is 8~12mm, in order to wind from Venturi tube is discharged.
Venturi tube 2 air intake and front homogenizing plate 4 being welded, outlet air end and rear homogenizing plate 5 weld, and check Welding quality, it is ensured that without leak source.
Select suitable metal tubing, first measure metal pipe material and by the Venturi tube of the most completion of processing and current-sharing The compositions size of plate, in advance in place by complete to malleation pressure pipe 7 and negative pressure taking pressure pipe 8 perforate, perforate size is 12, perforate puts the compositions of Venturi tube and homogenizing plate into metal pipe material correct position after terminating, after verification position is errorless, and will Front and back homogenizing plate excircle welds with metal circular tube inwall, and checks welding quality, it is ensured that without leak source.
The measurement apparatus completing combination installation is arranged on the pipeline needing to measure air quantity, can be horizontally mounted, it is possible to hang down Straight installation, should be noted during right angle setting that pipeline fluid is from bottom to top, after welding, then takes in the malleation being complete before Pressure pipe 7 and negative pressure taking pressure pipe 8 tapping welding pressure pipe, select the rustless steel pressure pipe of 12 to increase the use of pressure pipe Life-span, for ensure online can more emat sensor, each on malleation pressure pipe 7 and negative pressure taking pressure pipe 8 pipeline a cut-off is installed Valve, is respectively connected to malleation pressure pipe 7 and negative pressure taking pressure pipe 8 the positive and negative pressure chamber of pressure transmitter, then is become by pressure after preparing pipeline Send device signal and upper computer control system to connect and perform and show setting accordingly.
Can measure test, open blower motor and start blower motor, after fan starting, wind flows into along pipeline Current-sharing Combined type venturi tube apparatus for measuring air quantity, wind from the first air channel 9 through front homogenizing plate 4, Venturi tube 2, after homogenizing plate 5, the second air channel 6 is flowing into boiler, and at the 2-1 of the Venturi tube 2 between front homogenizing plate 4 and rear homogenizing plate 5, wind is from tapping Entering negative pressure pressure chamber 3, carry out pressure through negative pressure pressure port 8, malleation pressure port 7 is close front homogenizing plate in the first air channel 4 positions, obtain stable, simple subordinate flow field of flowing after processing through a series of forward and backward homogenizing plate, pass through pressure inverting The pressure reduction of device shows that visible whole measurement process is highly stable, and sensitivity is the highest, opens big and turns down damper, finding pressure The differential pressure that transmitter shows varies in time also with the aperture change of damper, and whole measurement process data is stable, fluctuation Little, reaction is fast, and burning and control to whole boiler serve well help.
Present configuration is simple, take up space little and can conveniently install.
The present invention is applied widely, is unsatisfactory for design peace particular for pulverized coal preparation system characteristics of compact layout and apparatus for measuring air quantity The repowering of dress condition or new-built unit use.
Present system resistance is little, reliability is high, measurement data accuracy high, it is little to fluctuate, and easily promotes.

Claims (6)

1. a current-sharing Combined type venturi tube apparatus for measuring air quantity, including measurement apparatus body 1, Venturi tube 2 and front current-sharing Plate 4, it is characterised in that: Venturi tube 2, front is installed in described current-sharing Combined type venturi tube apparatus for measuring air quantity body 1 Homogenizing plate 4 and rear homogenizing plate 5, measurement apparatus body 1 top position is provided with malleation pressure pipe 7 and negative pressure taking pressure pipe 8.
A kind of current-sharing Combined type venturi tube apparatus for measuring air quantity the most according to claim 1, it is characterised in that: described Measurement apparatus body 1 cross section is square or circular.
A kind of current-sharing Combined type venturi tube apparatus for measuring air quantity the most according to claim 1, it is characterised in that: described There are uniform perforate, front homogenizing plate 4 and rear homogenizing plate 5 cross section in front homogenizing plate 4 and rear homogenizing plate 5 cross section along pipeline fluid stream Being arranged in measurement apparatus body 1 before and after dynamic direction, outer ring, homogenizing plate cross section is installed with measurement apparatus body 1 inner wall sealing.
A kind of current-sharing Combined type venturi tube apparatus for measuring air quantity the most according to claim 1, it is characterised in that: described Venturi tube 2 is arranged between front homogenizing plate 4 and rear homogenizing plate 5, Venturi tube 2 front/rear end and front homogenizing plate 4 and rear current-sharing Plate 5 cross section seals installs, and has through hole, Venturi tube quantity and homogenizing plate cross section the number of openings one at Venturi tube 2 throat Cause, and the specification of each Venturi tube 2 is the most identical.
A kind of current-sharing Combined type venturi tube apparatus for measuring air quantity the most according to claim 1, it is characterised in that: described Malleation pressure pipe 7 is through measurement apparatus body 1 outer wall, during punch position is directly over front homogenizing plate 4 front end measurement apparatus body 1 Position, centre.
A kind of current-sharing Combined type venturi tube apparatus for measuring air quantity the most according to claim 1, it is characterised in that: described Negative pressure taking pressure pipe 8 is through measurement apparatus body outer wall, perforation measurement apparatus body between front homogenizing plate 4 and rear homogenizing plate 5 Top center position.
CN201610876982.XA 2016-10-08 2016-10-08 A kind of current-sharing Combined type venturi tube apparatus for measuring air quantity Pending CN106225857A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201610876982.XA CN106225857A (en) 2016-10-08 2016-10-08 A kind of current-sharing Combined type venturi tube apparatus for measuring air quantity

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Application Number Priority Date Filing Date Title
CN201610876982.XA CN106225857A (en) 2016-10-08 2016-10-08 A kind of current-sharing Combined type venturi tube apparatus for measuring air quantity

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Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN85204529U (en) * 1985-11-02 1986-06-18 重庆工业自动化仪表研究所 Uniform speed tube flowmeter working at a large differential pressure
CN201429433Y (en) * 2009-06-18 2010-03-24 杨力生 Partitioned airflow sensor
CN201697648U (en) * 2010-06-28 2011-01-05 江阴市节流装置厂有限公司 Integrally machined Venturi tube
CN202057363U (en) * 2011-03-29 2011-11-30 温州市捷达石化仪表有限公司 Venturi tube with heat-tracing clamping sleeve
CN202748062U (en) * 2012-07-05 2013-02-20 中国天辰工程有限公司 Venturi-shaped porous orifice plate flowmeter
CN202956149U (en) * 2012-11-27 2013-05-29 银川融神威自动化仪表厂(有限公司) Matrix venturi type cross section flowmeter
CN205079804U (en) * 2015-04-24 2016-03-09 武金玉 Throttling arrangement and throttling flow meter

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN85204529U (en) * 1985-11-02 1986-06-18 重庆工业自动化仪表研究所 Uniform speed tube flowmeter working at a large differential pressure
CN201429433Y (en) * 2009-06-18 2010-03-24 杨力生 Partitioned airflow sensor
CN201697648U (en) * 2010-06-28 2011-01-05 江阴市节流装置厂有限公司 Integrally machined Venturi tube
CN202057363U (en) * 2011-03-29 2011-11-30 温州市捷达石化仪表有限公司 Venturi tube with heat-tracing clamping sleeve
CN202748062U (en) * 2012-07-05 2013-02-20 中国天辰工程有限公司 Venturi-shaped porous orifice plate flowmeter
CN202956149U (en) * 2012-11-27 2013-05-29 银川融神威自动化仪表厂(有限公司) Matrix venturi type cross section flowmeter
CN205079804U (en) * 2015-04-24 2016-03-09 武金玉 Throttling arrangement and throttling flow meter

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
陆水钧 等: "《化工过程的特殊测量》", 30 September 1989, 化学工业出版社 *

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Application publication date: 20161214

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