CN109823838A - A kind of method and device carrying out the tachometric survey of coal dust pneumatic conveying using novel electrostatic sensor - Google Patents
A kind of method and device carrying out the tachometric survey of coal dust pneumatic conveying using novel electrostatic sensor Download PDFInfo
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- CN109823838A CN109823838A CN201910060637.2A CN201910060637A CN109823838A CN 109823838 A CN109823838 A CN 109823838A CN 201910060637 A CN201910060637 A CN 201910060637A CN 109823838 A CN109823838 A CN 109823838A
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- coal dust
- electrostatic induction
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- pneumatic conveying
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Abstract
The present invention devises a kind of method for carrying out the tachometric survey of coal dust pneumatic conveying using novel electrostatic sensor: under electrostatic induction effect, the flow signals of novel electrostatic sensor acquisition coal dust, it passes signal processing circuit back, calculates coal dust using delay algorithm and convey section average speed.The invention also discloses the measuring devices of the above-mentioned measurement method of application.Novel electrostatic sensor includes steel pipe, ceramic tube, Annular electrostatic induction antenna and plug-in type electrostatic induction antenna；Annular electrostatic induction antenna is wrapped in ceramic pipe outer wall；Plug-in type electrostatic induction antenna is fixed on ceramic tube, and position is on material conveying pipe apart within the scope of the 500mm of section, optimum position is to be in same section with loop aerial where loop aerial；Both the above antenna is combined as the element of detection electrostatic charge signal.The measurement method of coal dust pneumatic conveying speed proposed by the present invention can effectively measure the section average speed of coal dust pneumatic conveying in industrial processes in real time.
Description
Technical field
The invention belongs to the pneumatic conveying flow detection fields of coal dust, and in particular to a kind of application novel electrostatic sensor into
The method and device of row coal dust pneumatic conveying tachometric survey.
Background technique
Current thermal power plant is typically all that coal cinder is worn into coal dust in coal pulverizer, is eventually sent to burn in boiler.
The air-supply for entering boiler in thermal power plant for carrying coal dust is known as First air, and First air wind speed is to adjust boiler working condition and combustion
Burn optimization important indicator, primary air speed measuring inaccuracy, easily lead to boiler-burner scaling loss, tube cell plugging, water-cooling wall coking,
The accidents such as Waterwall tube failure.In this case, the pneumatic conveying speed for controlling coal dust is particularly important.
Coal dust pneumatic conveying speed electrostatic measurement principle are as follows: when coal dust conveys in pipeline with air-flow, due to coal dust and coal
Interaction between powder, between coal dust-pipeline can generate electric charge transfer between the two, be eventually exhibited as on pulverized coal particle
With certain charge and become the electrostatic signal flowed, the electrostatic current signal detected is utilized to carry out coal dust pneumatic conveying section
The calculating of average speed measures.For electrostatic measurement electrode include diversified forms, mainly have plug-in electrode, annular electrode with
And multi-electrode measurement method.Annular electrode, which is arranged, is close to installation in insulation pipeline section outer wall, and multi-electrode is multiple electrode array arrangement structure
At built-in electrostatic transducer.Annular electrode and multi-electrode are not easy stream field and damage, and application is wider.But practical flowing
When, each section is unevenly distributed in annular electrode pipeline, especially equal close to pulverized coal particle flowing velocity in duct wall and pipeline
Not identical, built-in circular ring type electrostatic transducer is difficult to meet actual measurement demand.Using multiple electrode array arrangement type electrostatic
Sensor can measure charge inducing amount by multi-piece electrode, although more comprehensively coal dust transport flow parameter letter can be obtained
Number, the applied defect of circular ring type electrostatic transducer is made up, but humidity increase causes electrostatic interaction to reduce in managing, so that electrode is surveyed
It obtains signal radio-frequency component to reduce, leads to measurement delay inaccuracy, signal amplitude also reduces.So annular electrode and multi-electrode system
Measurement error is big, is even unable to measure, and influences the accuracy of measurement result.
Summary of the invention
The present invention for above-mentioned coal dust pneumatic conveying tachometric survey method there are the shortcomings that, for solving the problems, such as this mesh
, a kind of method and device carrying out the tachometric survey of coal dust pneumatic conveying using novel electrostatic sensor is provided.Plug-in type electrostatic
Induction antenna and Annular electrostatic induction antenna combine, and accurately measure close to the coal dust flowing speed inside pipeline and pipeline
Degree, measurement is quickly and precision is very high.Plug-in type electrostatic induction antenna and Annular electrostatic induction antenna combine, as upstream and downstream electricity
The sensor on road when pulverized coal particle flows through sensor, obtains rapidly signal, and the electrostatic signal of sensor output is transmitted to control
End, the two paths of signals at a distance of L finds out delay τ according to delay algorithm, and then calculates the pneumatic conveying speed of coal dust.
Coal dust pneumatic conveying speed is carried out using novel electrostatic sensor the first purpose of the invention is to provide a kind of
Measurement method, this method mainly calculate coal dust conveying section average speed by delay algorithm.Pipeline upstream and downstream distance is L,
Plug-in electrode is installed, pulverized coal particle flows through electrode, finds out delay τ according to delay algorithm, sensor exports electrostatic signal to control
End processed, and then calculate the pneumatic conveying speed of coal dust.
Coal dust pneumatic conveying speed is carried out using novel electrostatic sensor a second object of the present invention is to provide a kind of
Measuring device.Novel electrostatic sensor includes steel pipe, ceramic tube, Annular electrostatic induction antenna and plug-in type electrostatic induction day knot
It closes, Annular electrostatic induction antenna is wrapped in ceramic pipe outer wall, and plug-in type electrostatic induction antenna is fixed on ceramic tube, and position is in object
On material conveying tube road within the scope of section 500mm where loop aerial, optimum position is to be in same section with loop aerial,
Both the above antenna is combined as the element of detection electrostatic charge signal.The plug-in type electrostatic induction antenna of device requirement upstream and downstream
In parallel.Under electrostatic induction effect, novel electrostatic sensor obtains the flow signals of coal dust, passes signal processing circuit back, utilizes
Delay algorithm calculates coal dust and conveys section average speed.Plug-in type electrostatic induction antenna uses wear-resistant conductive material, Annular electrostatic
Induction antenna uses conductive material, and two kinds of antennas combine, and measurement more precisely, more rapidly, and is easily installed, repairs, and having can weigh
The high advantage of renaturation；There is good measurement in the case that such as temperature and humidity, coal are different under various different complex working conditions
Energy.
Specific implementation
As shown in Figure 1 for using the measuring device of novel electrostatic sensor progress coal dust pneumatic conveying speed measurement method
Cross-sectional view of the structure, it is main including the new of steel pipe 1, ceramic tube 2, Annular electrostatic induction antenna and plug-in type electrostatic induction antenna composition
Type electrostatic transducer 3.Plug-in type electrostatic induction antenna and Annular electrostatic induction antenna combine 3 sensing as upstream and downstream circuit
Device, it is desirable that the plug-in type electrostatic induction antenna parallel of upstream and downstream.When pulverized coal particle flows through sensor, signal is obtained rapidly, is sensed
The electrostatic signal of device output is transmitted to control terminal, and the two paths of signals at a distance of L finds out delay τ according to delay algorithm, and then calculates coal
The pneumatic conveying speed of powder.
Figure of description
Fig. 1 is the measuring device for the measurement method that the present invention carries out coal dust pneumatic conveying speed using novel electrostatic sensor
Cross-sectional view of the structure.
Fig. 2 is the measuring device for the measurement method that the present invention carries out coal dust pneumatic conveying speed using novel electrostatic sensor
Figure.
Fig. 3 is the measuring device for the measurement method that the present invention carries out coal dust pneumatic conveying speed using novel electrostatic sensor
Partial cutaway view.
Claims (4)
1. a kind of measuring device for carrying out coal dust pneumatic conveying speed using novel electrostatic sensor, characterized in that Annular electrostatic
Induction antenna is wrapped in ceramic pipe outer wall, and plug-in type electrostatic induction antenna is fixed on ceramic tube, and position is in material conveying pipe
On where the loop aerial within the scope of the 500mm of section, optimum position is to be in same section, both the above day with loop aerial
Line is combined as the element of detection electrostatic charge signal.
2. a kind of measurement for carrying out coal dust pneumatic conveying speed using novel electrostatic sensor according to claim 1 fills
It sets, it is characterized in that Annular electrostatic induction antenna axial width has the upper limit without lower limit, width is less than 10mm.
3. a kind of measurement for carrying out coal dust pneumatic conveying speed using novel electrostatic sensor according to claim 2 fills
It sets, it is characterized in that plug-in type electrostatic induction antenna is limited to pipe diameter, depth is greater than 100mm.
4. a kind of measurement for carrying out coal dust pneumatic conveying speed using novel electrostatic sensor according to claim 3 fills
It sets, it is characterized in that upstream and downstream plug-in type electrostatic induction antenna parallel, is in the same section, distance 200-500mm range, otherwise
It will affect the correlation of signal；Upstream and downstream Annular electrostatic induction antenna distance 200-500mm range；Plug-in type electrostatic induction day
Line optimum position is among Annular electrostatic induction antenna.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910060637.2A CN109823838A (en) | 2019-01-22 | 2019-01-22 | A kind of method and device carrying out the tachometric survey of coal dust pneumatic conveying using novel electrostatic sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910060637.2A CN109823838A (en) | 2019-01-22 | 2019-01-22 | A kind of method and device carrying out the tachometric survey of coal dust pneumatic conveying using novel electrostatic sensor |
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| CN109823838A true CN109823838A (en) | 2019-05-31 |
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| CN201910060637.2A Withdrawn CN109823838A (en) | 2019-01-22 | 2019-01-22 | A kind of method and device carrying out the tachometric survey of coal dust pneumatic conveying using novel electrostatic sensor |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110194372A (en) * | 2019-06-05 | 2019-09-03 | 中国石油大学(北京) | Device, pneumatic conveying experimental system and the experimental method of real-time measurement electrostatic |
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| GB9608619D0 (en) * | 1996-04-24 | 1996-07-03 | Head Philip | A flow meter |
| 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 |
| CN101183250A (en) * | 2007-12-14 | 2008-05-21 | 天津大学 | Intelligentize device used for fine material pipeline pneumatic conveying monitoring |
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| CN104316779A (en) * | 2014-11-05 | 2015-01-28 | 北京华清茵蓝科技有限公司 | Array type annular electrostatic sensor and pneumatic transmission powder measurement device and method |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110194372A (en) * | 2019-06-05 | 2019-09-03 | 中国石油大学(北京) | Device, pneumatic conveying experimental system and the experimental method of real-time measurement electrostatic |
| CN110194372B (en) * | 2019-06-05 | 2023-12-29 | 中国石油大学(北京) | Device for measuring static electricity in real time, pneumatic conveying experiment system and experiment method |
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