CN107449935A - Seam speedometer - Google Patents
Seam speedometer Download PDFInfo
- Publication number
- CN107449935A CN107449935A CN201710580750.4A CN201710580750A CN107449935A CN 107449935 A CN107449935 A CN 107449935A CN 201710580750 A CN201710580750 A CN 201710580750A CN 107449935 A CN107449935 A CN 107449935A
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- Prior art keywords
- induction coil
- module
- seam
- coal dust
- signal
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
- G01P5/00—Measuring speed of fluids, e.g. of air stream; Measuring speed of bodies relative to fluids, e.g. of ship, of aircraft
- G01P5/18—Measuring speed of fluids, e.g. of air stream; Measuring speed of bodies relative to fluids, e.g. of ship, of aircraft by measuring the time taken to traverse a fixed distance
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- Engineering & Computer Science (AREA)
- Aviation & Aerospace Engineering (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Investigating Or Analyzing Materials By The Use Of Magnetic Means (AREA)
Abstract
Seam speedometer, including inductive probe, stainless steel pipes, operation terminal.The first induction coil A of space D, the second induction coil B be present including at least two in the inductive probe, first induction coil A, the second induction coil B are fixedly mounted on the inwall of stainless steel pipes, first induction coil A, the second induction coil B pass through connection signal processing module respectively, signal processing module link control module, control module attended operation terminal.The operation terminal includes guidance panel, is provided with the guidance panel：Display module, key-press module, 4 20mA normalized currents output interfaces, the serial interfaces of RS 232, Hart output interfaces, network interface, warning output interface.A kind of seam speedometer of the present invention, passes through sensor two fixing points using to powered coal dust, produces the time difference of electromagnetic induction signal, to calculate speed of the coal dust by sensor, so as to the speed of the coal dust asked in the case of Geldart-D particle.
Description
Technical field
A kind of seam speedometer of the present invention, for seam pipeline by measuring flow velocity during gases at high pressure pulverized coal conveying.
Background technology
For the dense-phase transporting system of dry coal efflorescence gasification process, the measurement of coal dust flow velocity is extremely important, not only
The control parameter of relation coal-grinding process, the oxygen coal ratio of gasification is more directly participated in, so as to influence gasification efficiency and technique peace
Entirely, technic index.For coal chemical industry, mainly density-velocity's e measurement technology is used.
" research of 1000WM extra-supercritical unit coal dusts on-line monitoring technique ",（《Engineering Thermophysics journal》, volume 30, the
2 phases, the 257-260 pages, 2 months 2009）A kind of coal dust on-line monitoring system is described, for coal dust speed in pulverized coal channel
Measurement, is made up of 3 parts, and Part I is probe, and probe afterbody is provided with semiconductor laser, Laser Power Devices, photosignal
The elements such as monitoring, signal amplification, probe are installed on the airduct after coal pulverizer exports mill separator, radially insert coal pipe
At road section 2/3；Part II is rack, and the drying for undertaking the concentration, blowback source of the gas of signal circuit is removed and distributed, signal transacting
Deng work；Part III is PLC signal translating systems, and the standard heat power engineering signal that Monitoring Data is converted to 4 ~ 20mA is passed to DCS,
The data with data collection synchronous on the spot are provided for operations staff.Every flour mill supplies 8 pulverized coal channels.Be applied to simultaneously under
Measured while in material sequence program with fine coal concentration, fineness, to realize the real-time monitoring of electric field coal dust multi-parameter.Which is deposited
The drawbacks of be：①：Do not account in blanking sequence program, the monitoring of coal dust flow velocity connects with the measurement control of coal dust density
Lock protection, i.e., when coal dust flow velocity, density any one parameter require more than regulation, how to realize that coal dust conveying control process connects
Lock protection.②：Do not possess and telecommunication network transfer function is carried out to output signal.
Chinese patent " a kind of device and method of thick paste pipe flow speed measurement ",（201110270135.6）, including
Test pipeline section and sensing data acquisition system two large divisions, wherein, test pipeline section successively by flange A, straight tube, show that fast magnetic patch is launched
Device sensitive coil fixing device, flange B and show fast magnetic patch retracting device composition.Sensing data acquisition system is successively by feeling
Answer induction coil A, sensitive coil B, modulate circuit A, modulate circuit, data collecting card and computer composition；Wherein, flange
A and flange B are respectively welded at straight tube both ends, for installing on thick paste conveyance conduit；Show fast magnetic patch delivery device welding
At the aperture that test pipeline section is accomplished fluently in advance；Show that fast magnetic patch retracting device is placed in the exit of whole thick paste conveyance conduit；
Sensitive coil fixing device does not contact with test pipeline section；Sensitive loop A and sensitive coil B are enclosed on outside straight tube
Wall, and be mounted on sensitive coil fixing device, sensitive loop A and sensitive coil B are separated by a regulation
Distance, the precision of the distance by sensitive coil fixing device location dimension accuracy guarantee；Modulate circuit is encapsulated in
The inside of sensitive coil, electric signal are drawn by a two-pin plug and are connected in series on the terminal of data collecting card；Data acquisition
Card is connected to computer by special I/O interfaces.The technical scheme is the high slumpability using thick paste, and fast magnetic patch is shown in guarantee
As thick paste is moved with same speed, the speed of fast magnetic patch is shown by measurement to obtain the flow velocity of thick paste indirectly,
If the viscosity of fluid is relatively low, the flow velocity of fluid can not be measured with the device of the patent.Coal dust during gases at high pressure pulverized coal conveying
In tiny graininess, it is considered as coal dust fluid, but the fluid does not possess high slumpability, now, using Chinese patent " one
The device and method of kind thick paste pipe flow speed measurement " just can not realize the accurate measurement of coal dust flow velocity.
The content of the invention
The present invention provides a kind of seam speedometer, using sensor two fixing points are passed through to powered coal dust, produces electromagnetism
The time difference of induced signal, to calculate speed of the coal dust by sensor, so as to the speed of the coal dust asked in the case of Geldart-D particle
Degree；Meanwhile the seam speedometer possesses remote signal transmission and abnormal alarm function.
The technical scheme that the present invention takes is：
Seam speedometer, including inductive probe, stainless steel pipes, operation terminal.The inductive probe includes at least two
The the first induction coil A, the second induction coil B, the first induction coil A, the second induction coil B that space D be present are fixedly mounted on
On the inwall of stainless steel pipes, the first induction coil A, the second induction coil B pass through connection signal processing module, letter respectively
Number processing module link control module, control module attended operation terminal.The operation terminal includes guidance panel, the operation
It is provided with panel：Display module, key-press module, 4-20mA normalized currents output interface, RS-232 serial interfaces, Hart outputs
Interface, network interface, warning output interface, the display module, key-press module and the interface are all connected with control module.
The first induction coil A, the second induction coil B connect signal processing module by double shielded coaxial cable.
The first induction coil A, the second induction coil B are fixed by the first fixing point, the installation of the second fixing point respectively,
First fixing point, the second fixing point are located on the outer wall of stainless steel pipes, and two fixing points have space D.
The induction coil is the coiling copper coil in the groove of a resin annulus, by being poured into the groove of resin annulus
Epoxide-resin glue encapsulation is formed, and fixing point is set on the resin enclosure of induction coil, and fixing point sets output wiring terminal, copper cash
The end connection output wiring terminal of circle.
The first induction coil A, the second induction coil B and stainless steel pipes are co-axially mounted, stainless steel pipes it is coaxial
Multipair first induction coil A, the second induction coil B are installed, every a pair of induction coils connect signal processing module on cross section.
The signal processing module, control module, operation terminal are arranged on explosion-proof cabinet inside, signal processing module connection
Input wires terminal, input wires terminal are located at explosion-proof cabinet side, the positive installation operation terminal of explosion-proof cabinet.
The signal processing module includes signal filtration module, signal amplification module, A/D modular converters；The filtering mould
Block is filtered using step low-pass ButterWorth filter circuits to signal；The A/D change-over circuits use ADC0808 cores
Piece；The signal amplification circuit uses MAX4196 chips.
The signal processing module is connected by wireless communication mode and control module communication, control module connection GSM moulds
Block, communicated to connect with handheld terminal.
The explosion-proof cabinet is provided with power module, and power module is used to AC220V being converted to DC24V or 5V electricity
Pressure, working power is provided for modules.
A kind of coal dust flow-speed measurement method, using two the first induction coils for passing through inductive probe to powered coal dust
A, the second induction coil B, the time difference of electromagnetic induction signal is produced, to calculate speed of the coal dust by inductive probe, so as to
Speed of the coal dust asked in the case of Geldart-D particle；When coal dust passes through two coils, the distances of two coils is D, induced signal
Waveform existence time is poor, according to induced signal time difference T, calculates the instantaneous velocity that coal dust passes through inductive probe：V=D/T .
A kind of seam speedometer of the present invention, technique effect are as follows：
1：In order to overcome existing collection jitter, inductive probe of the invention employs multipair induction coil, shortened
Collection period, the unit interval data of collection are more.
2：Signal processing module includes signal filtration module, signal amplification module, A/D modular converters, is amplified by signal
Module amplifies signal, makes signal apparent.Signal filtration module filters low frequency signal and clutter, makes signal more accurate.
3：With needing in the prior art by electrostatic measurement method caused by measurement pulverized coal particle and measuring probe friction not
Together, the present invention uses passive inductive probe direct measurement, will not produce external signal interference, and measurement accuracy is high.And sensing is visited
Survey the pollution of device, change in shape will not have an impact to coal dust flow velocity measurement.
4：The present invention can be shown in real time by display module to coal dust flow velocity, and have number by key-press module
According to can look into, power-down data protection, the function such as upper electric self-starting.
5：Induction coil is the coiling copper coil in the groove of a resin annulus, by pouring into ring into the groove of resin annulus
The encapsulation of oxygen resin glue forms.Sensing element is copper coil in induction coil, and its outside all by hard resin-encapsulated, is not only prevented
Only copper coil sustains damage, and also facilitates induction coil fixing point that induction coil is fixed.
6：Because induction coil induced signal is fainter, in order to prevent the interference of external signal, induction coil passes through double
Screened coaxial cable connects signal processing module.
7：Measurement result is changed into 4-20mA standard current signals and is transported to DCS system by the present invention, realizes 4 seams
The continuous measurement of fine coal speed, while applied in blanking sequence program and the measurement control of fine coal density and interlock protection, with
Ensure the long period safe operation of fine coal gasification process.
8：Correspondence with foreign country of the present invention is exported using traditional 4-20mA and RS-232 serial ports, and instrument docks use with outside
Hart agreements, and intelligent network port is designed, control output and abnormal alarm function.
Brief description of the drawings
Fig. 1 is the structural representation of seam speedometer of the present invention.
Fig. 2 is the explosion-proof cabinet internal structure schematic diagram of seam speedometer of the present invention.
Fig. 3 is the induction coil cross-sectional view of seam speedometer of the present invention.
Fig. 4 is the signal processing module connection diagram of seam speedometer of the present invention.
Embodiment
Principle analysis：
Collision, fracture in process of pneumatic transmission, between pulverized coal particle and conveying pipeline inner wall be present, peel off, contact point in coal dust
From, friction phenomena such as and produce electrostatic charge.When pulverized coal particle positively charged in flowing is close to the coverage of inductive probe 1
When, the idea for inside of popping one's head in will be attracted the outer layer close to particulate matter, when this particulate matter flows through the installation site of inductive probe 1
Afterwards, the electronics in inductive probe 1 will be attracted to another side.When particulate matter leaves coverage, in inductive probe 1
Electronics will recover original distribution situation, and the mobile phenomenon of such electronic population forms one weak current letter that can be detected
Number.There is the corresponding relation of determination due to measuring low current signal and concentration, speed of the pulverized coal particle in conveyance conduit, thus
The low current signal is obtained, and passes through a series of processing, you can obtains coal dust speed.
As shown in Fig. 1 ~ Fig. 4, seam speedometer, including inductive probe 1, stainless steel pipes 2, operation terminal 5.The sense
Detector 1 is answered the first induction coil A of space D, the second induction coil B, the first induction coil A, to be present including at least two
Two induction coil B are fixedly mounted on the inwall of stainless steel pipes 2, and the first induction coil A, the second induction coil B pass through respectively
Connection signal processing module 4, the link control module 3 of signal processing module 4, the attended operation terminal 5 of control module 3.
The operation terminal 5 includes guidance panel, is provided with the guidance panel：Display module 6, key-press module 7,4-
20mA normalized currents output interface 5.1, RS-232 serial interfaces 5.2, Hart output interfaces 5.3, network interface 5.4, alarm are defeated
Outgoing interface 5.5, the display module 6, key-press module 7 and the interface are all connected with control module 3.
The control module 3 uses 32 arm processors.
The display module 6 uses LCD display or microcomputer monitor.
The key-press module 7 realizes that function includes：The functions such as switch/machine, inquiry, printing tachograph.
The first induction coil A, the second induction coil B are connected at signal by two double shielded coaxial cables 8 respectively
Manage module 4.
The first induction coil A, the second induction coil B are installed solid by the first fixing point 9, the second fixing point 9 ' respectively
Fixed, the first fixing point 9, the second fixing point 9 ' are located on the outer wall of stainless steel pipes 2, and two fixing points have space D.
First fixing point 9, the main part of the second fixing point 9 ' use plastics fixed seat, and it is glued to stainless steel pipes 2
Outer wall, be shaped as the square with deep-slotted chip breaker, fixing point sets output wiring terminal 12, the end connection output of copper coil 11
Binding post 12.
The induction coil is the coiling copper coil 11 in the groove of a resin annulus 10, by the groove of resin annulus 10
It is interior
Pour into epoxide-resin glue encapsulation to form, fixing point is set on the resin enclosure of induction coil.In stainless steel pipes 2 before installation
Spile so that two ends of induction coil are stretched out outside stainless steel pipes 2, and are encapsulated, solidified by epoxide-resin glue, so
Integrated afterwards with fixing point.
The first induction coil A, the second induction coil B and stainless steel pipes 2 are co-axially mounted, stainless steel pipes 2 it is same
Multipair first induction coil A, the second induction coil B are installed, every a pair of induction coils connect signal transacting mould on axle cross section
Block 4.Preferably 31 pairs of copper coils of the invention, every a pair of copper coils form a set of coal dust flow velocity sensing probe unit, so shortened
Collection period, the unit interval data of collection are more.
The signal processing module 4, control module 3, operation terminal 5 are arranged on inside explosion-proof cabinet 13, signal transacting mould
Block 4 connects input wires terminal 14, and input wires terminal 14 is located at the explosion-proof side of cabinet 13, the front installation behaviour of explosion-proof cabinet 13
Make terminal 5.
The signal processing module 4 includes signal filtration module 4.1, signal amplification module 4.2, A/D modular converters 4.3；
The filtration module is filtered using step low-pass ButterWorth filter circuits to signal；The A/D change-over circuits use
ADC0808 chips；The signal amplification circuit uses MAX4196 chips.
The signal processing module 4 is connected by wireless communication mode and the communication of control module 3, and control module 3 connects GSM
Module, communicated to connect with handheld terminal.Control module is transferred to by Zigbee module or wireless communication module by data
3, control module 3 can calculate coal dust flow velocity, while give result of calculation to operation by the 4G module transfers of long-distance transmissions
Personnel, when coal dust flow velocity beyond it is safe when, control module 3 sends control command, is sent short messages by gsm module to operating personnel,
Remind operating personnel timely scene to check and handle, while and export alarm.
The explosion-proof cabinet 13 is provided with power module 15, power module 15 be used for by AC220V be converted to DC24V or
5V voltages, working power is provided for modules.
A kind of coal dust flow-speed measurement method, using two the first induction coils for passing through inductive probe 1 to powered coal dust
A, the second induction coil B, the time difference of electromagnetic induction signal is produced, to calculate speed of the coal dust by inductive probe 1, so as to
Speed of the coal dust asked in the case of Geldart-D particle；When coal dust passes through two coils, the distances of two coils is D, induced signal
Waveform existence time is poor, according to induced signal time difference T, calculates the instantaneous velocity that coal dust passes through inductive probe 1：V=D/T
。
Measurement result is changed into 4-20mA standard current signals and is transported to DCS system by the present invention, realizes 4 seam powder
The continuous measurement of coal speed, while applied in blanking sequence program and the measurement control of fine coal density and interlock protection, with guarantor
Hinder the long period safe operation of fine coal gasification process.
Correspondence with foreign country of the present invention is exported using traditional 4-20mA and RS-232 serial ports, and instrument is docked with outside and uses hart
Agreement, and intelligent network port is designed, control output and abnormal alarm function.
Seam speedometer of the present invention, parameter are as follows：
1）, measurement range： 0m/s ~ 20m/s.
2）, output form：
A ＞, LCD are shown or microcomputer monitor is shown；
b〉、DC：0V ~ 5V, 4mA ~ 20mA,
3）, function：Placing keyboard, data can be looked into, power-down data protection, upper electric self-starting etc.,
4）, the maximum transmission distance of signal is 1000m between current meter and converter.
5）, current meter normal running conditions
A ＞, environment temperature：Flow velocity is calculated as -20 DEG C ~ 55 DEG C, and converter is 0 DEG C ~ 50 DEG C；
B ＞, relative temperature：Less than 90%；
C ＞, converter power voltage：AC（220±22）V or DC 24V；
The medium for having corrosiveness to non-ferrous metals such as plating inscription, plating sickle layer, copper, no strong-electromagnetic field are not contained in d ＞, surrounding air
Interference, no judder.
Claims (10)
1. seam speedometer, including inductive probe（1）, stainless steel pipes（2）, operation terminal（5）, it is characterised in that：It is described
Inductive probe（1）Including at least two the first induction coils that space D be present（A）, the second induction coil（B）, the first sensing
Coil（A）, the second induction coil（B）It is fixedly mounted on stainless steel pipes（2）Inwall on, the first induction coil（A）, second sense
Answer coil（B）Pass through connection signal processing module respectively（4）, signal processing module（4）Link control module（3）, control
Module（3）Attended operation terminal（5）；The operation terminal（5）Including guidance panel, it is provided with the guidance panel：Display
Module（6）, key-press module（7）, 4-20mA normalized current output interfaces（5.1）, RS-232 serial interfaces（5.2）, Hart output
Interface（5.3）, network interface（5.4）, warning output interface（5.5）, the display module（6）, key-press module（7）It is and described
Interface is all connected with control module（3）.
2. seam speedometer according to claim 1, it is characterised in that：First induction coil（A）, the second induction coil
（B）Pass through double shielded coaxial cable（8）Connect signal processing module（4）.
3. seam speedometer according to claim 1, it is characterised in that：First induction coil（A）, the second induction coil
（B）Pass through the first fixing point respectively（9）, the second fixing point（9’）Installation is fixed, the first fixing point（9）, the second fixing point（（9’）
Positioned at stainless steel pipes（2）Outer wall on, space D be present in two fixing points.
4. according to the 1 or 2 or 3 seam speedometer of claim, it is characterised in that：The induction coil is justified in a resin
Ring（10）Groove in coiling copper coil（11）, by resin annulus（10）Groove in pour into epoxide-resin glue encapsulation form, feel
Answer and fixing point is set on the resin enclosure of coil, fixing point sets output wiring terminal（12）, copper coil（11）End connection
Output wiring terminal（12）.
5. seam speedometer according to claim 1, it is characterised in that：First induction coil（A）, the second induction coil
（B）With stainless steel pipes（2）It is co-axially mounted, stainless steel pipes（2）Coaxial cross section on multipair first induction coil is installed
（A）, the second induction coil（B）, every a pair of induction coils connection signal processing module（4）.
6. seam speedometer according to claim 1, it is characterised in that：The signal processing module（4）, control module（3）、
Operate terminal（5）Installed in explosion-proof cabinet（13）Inside, signal processing module（4）Connect input wires terminal（14）, input connects
Line terminals（14）Positioned at explosion-proof cabinet（13）Side, explosion-proof cabinet（13）Positive installation operation terminal（5）.
7. seam speedometer according to claim 1, it is characterised in that：The signal processing module（4）Filtered including signal
Module（4.1）, signal amplification module（4.2）, A/D modular converters（4.3）；The filtration module uses step low-pass
ButterWorth filter circuits are filtered to signal；The A/D change-over circuits use ADC0808 chips；The signal amplification
Circuit uses MAX4196 chips.
8. seam speedometer according to claim 1, it is characterised in that：The signal processing module（4）Pass through wireless telecommunications
Mode and control module（3）Communication connection, control module（3）Gsm module is connected, is communicated to connect with handheld terminal.
9. seam speedometer according to claim 6, it is characterised in that：The explosion-proof cabinet（13）It is provided with power module
（15）, power module（15）For AC220V to be converted into DC24V or 5V voltages, working power is provided for modules.
A kind of 10. coal dust flow-speed measurement method, it is characterised in that:Pass through inductive probe using to powered coal dust（1）Two
First induction coil（A）, the second induction coil（B）, the time difference of electromagnetic induction signal is produced, is visited to calculate coal dust by sensing
Survey device（1）Speed, so as to the speed of the coal dust asked in the case of Geldart-D particle；When coal dust passes through two coils, two coils
Distance be D, induced signal waveform existence time is poor, according to induced signal time difference T, calculates coal dust and passes through inductive probe
（1）Instantaneous velocity：V=D/T .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710580750.4A CN107449935A (en) | 2017-07-17 | 2017-07-17 | Seam speedometer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710580750.4A CN107449935A (en) | 2017-07-17 | 2017-07-17 | Seam speedometer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107449935A true CN107449935A (en) | 2017-12-08 |
Family
ID=60489017
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710580750.4A Pending CN107449935A (en) | 2017-07-17 | 2017-07-17 | Seam speedometer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107449935A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114112813A (en) * | 2021-11-18 | 2022-03-01 | 大连海事大学 | High-precision induction type abrasive particle sensor device and manufacturing method thereof |
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|---|---|---|---|---|
| US6691584B2 (en) * | 1999-07-02 | 2004-02-17 | Weatherford/Lamb, Inc. | Flow rate measurement using unsteady pressures |
| CN1800821A (en) * | 2006-01-05 | 2006-07-12 | 杭州典范科技有限公司 | Method and apparatus for measuring coal powder concentration and wind powder speed in coal power transportation pipe |
| CN101451867A (en) * | 2007-11-30 | 2009-06-10 | 上海银流计测仪器有限公司 | Slurry type electromagnetic flowmeter |
| CN102305876A (en) * | 2011-09-14 | 2012-01-04 | 中国矿业大学(北京) | Thick paste pipeline flow velocity measuring apparatus and method thereof |
| CN102680370A (en) * | 2012-05-21 | 2012-09-19 | 常州市新港热电有限公司 | Pulverized coal concentration online monitoring system |
| CN103323061A (en) * | 2013-06-27 | 2013-09-25 | 上海威尔泰仪器仪表有限公司 | Large-diameter electromagnetic flowmeter |
| CN103439528A (en) * | 2013-09-16 | 2013-12-11 | 中国矿业大学(北京) | Method and device for measuring flow speed of dense paste based on electromagnetic signal cross correlation |
| CN104820111A (en) * | 2015-03-27 | 2015-08-05 | 西安科尧自动化仪表研究所有限责任公司 | AC charge induction type flow velocity and flow measuring sensor |
| CN205079797U (en) * | 2015-11-04 | 2016-03-09 | 苏州华茂能源科技有限公司 | Pulverized coal transport real -time monitoring system of high accuracy |
| CN106574858A (en) * | 2014-08-04 | 2017-04-19 | 恩德斯+豪斯流量技术股份有限公司 | Magnetoinductive flowmeter having a plurality of measuring electrode pairs and different measuring tube cross sections |
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2017
- 2017-07-17 CN CN201710580750.4A patent/CN107449935A/en active Pending
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6691584B2 (en) * | 1999-07-02 | 2004-02-17 | Weatherford/Lamb, Inc. | Flow rate measurement using unsteady pressures |
| CN1800821A (en) * | 2006-01-05 | 2006-07-12 | 杭州典范科技有限公司 | Method and apparatus for measuring coal powder concentration and wind powder speed in coal power transportation pipe |
| CN101451867A (en) * | 2007-11-30 | 2009-06-10 | 上海银流计测仪器有限公司 | Slurry type electromagnetic flowmeter |
| CN102305876A (en) * | 2011-09-14 | 2012-01-04 | 中国矿业大学(北京) | Thick paste pipeline flow velocity measuring apparatus and method thereof |
| CN102680370A (en) * | 2012-05-21 | 2012-09-19 | 常州市新港热电有限公司 | Pulverized coal concentration online monitoring system |
| CN103323061A (en) * | 2013-06-27 | 2013-09-25 | 上海威尔泰仪器仪表有限公司 | Large-diameter electromagnetic flowmeter |
| CN103439528A (en) * | 2013-09-16 | 2013-12-11 | 中国矿业大学(北京) | Method and device for measuring flow speed of dense paste based on electromagnetic signal cross correlation |
| CN106574858A (en) * | 2014-08-04 | 2017-04-19 | 恩德斯+豪斯流量技术股份有限公司 | Magnetoinductive flowmeter having a plurality of measuring electrode pairs and different measuring tube cross sections |
| CN104820111A (en) * | 2015-03-27 | 2015-08-05 | 西安科尧自动化仪表研究所有限责任公司 | AC charge induction type flow velocity and flow measuring sensor |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114112813A (en) * | 2021-11-18 | 2022-03-01 | 大连海事大学 | High-precision induction type abrasive particle sensor device and manufacturing method thereof |
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Application publication date: 20171208 |