CN104614024B - A kind of power station powder induction system pulverized coal flow electrostatic measurement characterizing method and device - Google Patents
A kind of power station powder induction system pulverized coal flow electrostatic measurement characterizing method and device Download PDFInfo
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Abstract
The present invention is proposed for power station powder induction system pulverized coal flow electrostatic measurement characterizing method and device, wherein characterizing method is using the different circular ring electrode of width, utilize the contact of both electrostatic signal virtual values, by the virtual value and coal dust flowing velocity of the output electric signal for calculating wide, narrow circular electrostatic transducer, and one step calculate the ratio of virtual value, with reference to pulverized coal particle speed, for characterizing the flow of coal dust in conveyance conduit, the uniformity that same coal pulverizer supplies the coal powder distribation of each burner can be characterized on this basis.This method and device can improve the stability and accuracy of coal dust electrostatic measurement signal, and reduce the cost of measurement apparatus, can provide accurate basic data for the equilibrium assignment control of power station powder induction system coal dust.
Description
Technical field
The invention belongs to powder flowing field of measuring technique, and in particular to a kind of power station powder induction system pulverized coal flow is quiet
Electrical measurement characterizes method and device.
Background technology
In current large-scale thermal power machine group both at home and abroad, unit pulverized-coal system is typically all used.During unit operation, hot blast
Carry the primary wind and powder that coal dust is formed in coal pulverizer and leave coal pulverizer, enter into different conveyance conduits, and by these pipelines
Enter corresponding burner.Distributed into the wind speed of the First air of burner hearth, coal powder density and flow and each burner wind powder equal
Even degree will all directly affect the stability of combustion conditions and the efficiency of combustion of boiler in stove.The wind powder distribution of each burner is uneven
Furnace flame deflection can be produced, local heat load is too high, and some regions cause reducing atmosphere because coal powder density is too high in stove,
Slagging and high temperature corrosion process are exacerbated, and some burners can produce combustion pulsation or even flame-out phenomenon causes negative pressure in stove
Fluctuate widely.In addition, wind powder deviation increases between each burner, the problem of causing unburned carbon loss to increase, make combustion
Burner off-target working condition.With the increase of boiler capacity, number of burners increases, the wind powder point in powder processed and combustion system
Can more it be protruded with uneven problem.Therefore measurement power station powder induction system coal powder density, mass flow are to each burner internal
In the equilibrium assignment and burner of coal dust wind powder than regulation it is significant.
Generally, the mass concentration of coal dust is 300-500g/m in duff pipe3, wind powder mass ratio is 1.5-3:1, volume ratio is only
In 0.05% order of magnitude (at 100 DEG C), so low powder content so that the coal dust measuring method such as radiation, electric capacity seems
It is helpless.Warehouse formula coal-fired boiler combustion device entrance coal powder density is measured frequently with heat balance method of among power station, but for straight
Formula or the pulverized coal preparation system using transporting pulverized coal with exhaust gas are blown, larger temperature difference is not present due to conveying gas and between conveying powder,
Therefore heat balance method of can not also be applied.
The electrostatic sensing technique to grow up in recent years is to be based on the charged detection particle flow parameter of gas-solid rolling particles,
With system architecture is simple, non-contact, high sensitivity, cheap, safety and is suitable for severe industrial Geldart-D particle scene
The advantages that environment.Although electrostatic transducer can not provide the absolute measured value of the parameters such as granule density and mass flow, from
Control with for balanced angle, the relative measurement of concentration and flow is enough.This is due to that same coal pulverizer comes out
Coal dust there is similar charging characteristic, the composition of such as solid, particle size, shape, water capacity factor have similitude, because
The output of electrostatic transducer has comparativity in this each pipeline.At present, for given moist ingredients and the powder of particle size distribution
Body particle, under dilute phase conditions, it is believed that the virtual value (RMS) of electrostatic transducer output signal is directly proportional to grain flux.But thing
In reality, coal powder two-phase flow, due to pipe arrangement, service condition etc., causes distribution of the coal dust solid particle in pipeline in pipeline
Position is different, and the virtual value (RMS) of the output signal of annulus electrostatic transducer detection also can be different, and this will cause pulverized coal flow
Characterization value produces larger error, therefore the coal dust Balance route of powder induction system processed can produce larger deviation.
The content of the invention
In order to overcome the shortcomings of existing power station powder induction system pulverized coal flow electrostatic measurement method, the present invention proposes one
Kind multiple round annular electrode pulverized coal flow electrostatic measurement characterizing method and device, using the different circular ring electrode of width, utilize two
The contact of person's electrostatic signal virtual value, the virtual value and coal of the output electric signal by calculating wide, narrow circular electrostatic transducer
Powder flowing velocity, and a step calculates the ratio of virtual value, with reference to pulverized coal particle speed, for characterizing coal dust in conveyance conduit
Flow, the uniformity that same coal pulverizer supplies the coal powder distribation of each burner can be characterized on this basis.This method and device can
The stability and accuracy of coal dust electrostatic measurement signal are improved, and reduces the cost of measurement apparatus, can be power station powder delivery system
The equilibrium assignment control of system coal dust provides accurate basic data.
The present invention adopts the following technical scheme that：
One kind is used for power station powder induction system pulverized coal flow electrostatic measurement characterizing method, it is characterised in that step is as follows：
Step 1: prolonging the pipeline axial direction that coal dust flows through, three groups of annular shape array electrostatic transducers are set on pipeline outer wall,
Wherein occupy both sides two groups of width is identical and width less than middle one group, and pass through three groups of annular shape array electrostatic and sense
Device detects three groups of electrostatic signal data, wherein occuping the electrode electrostatic signal of two groups of annular shape array electrostatic transducers of both sides
Respectively { x (i), i=1,2 ... N } and { y (i), i=1,2 ... N }, the electrode of middle one group of annular shape array electrostatic transducer are quiet
Electric signal is { z (i), i=1,2 ... N }, calculates virtual value X, Y, Z of three groups of annular shape electrostatic transducer output signals respectively：
Wherein, N is the number of electrostatic signal data sampling point；
Step 2: using virtual value X, Y, Z for calculating three groups of annular shape electrostatic transducer output signals, calculate and obtain two
The ratio C of the circular electrostatic transducer of side and middle circular electrostatic transducer output signal virtual value, as in pipeline
The characterization value of coal powder density：
Step 3: electrostatic signal { x (i), i=1,2 ... N } and { y using the two groups of annular shape electrostatic transducer output in both sides
(i), i=1,2 ... N }, with reference to cross-correlation method, the delay time T that coal dust flows through the two groups of round loop electrode sensors in both sides is calculated, and
By the spacing L between the annular shape electrostatic transducer of two groups of both sides, pulverized coal particle flow velocity degree ν in pipeline is calculated：
Step 4: calculate the pulverized coal flow characterization value for flowing through three groups of annular shape array electrostatic transducers：
Q=Cv
Wherein, Q is pulverized coal flow characterization value.
Delay time T is：
τ=m Δs t
Wherein, Δ t is electrostatic signal sampling time interval, and m is that there is R (n) delay at maximum to count, and R (n) is quiet
The cross-correlation function of electric signal { x (i), i=1,2 ... N } and { y (i), i=1,2 ... N },
Wherein, n is the points of delay.
One kind is used for power station powder induction system pulverized coal flow electrostatic measurement characterization apparatus, including data acquisition device and with
The data processing equipment of the data acquisition device connection, it is characterised in that described data acquisition device is circular array
Electrostatic transducer measurement head, the circular array electrostatic transducer measurement head include insulation tube and are arranged on insulation tube outer surface
Two narrow circular electrostatic transducers and a wide circular electrostatic transducer, wherein wide circular electrostatic transducer
It is centrally positioned between two narrow circular electrostatic transducers.
Described data processing equipment includes signal conditioning circuit, data collecting card and computer, described annular shape
Array electrostatic transducer measurement head is connected with the signal input part of the signal conditioning circuit, defeated in the signal of signal conditioning circuit
Go out end and be sequentially connected described data collecting card and computer.
Described circular array electrostatic transducer measurement head also includes radome, insulating barrier and for by circular battle array
Row electrostatic transducer measurement head and conveyance conduit adpting flange, the insulating barrier are arranged on described circular electrostatic transducer
Outside, described radome is set in the outside of insulating barrier.
Compared with prior art, the invention has the advantages that：
1st, the circular electrostatic of different in width electrode is utilized compared to existing Dual-Phrase Distribution of Gas olid electrostatic measurement method, the present invention
The ratio of sensor output signal virtual value, reduce caused by Dual-Phrase Distribution of Gas olid solid particle spatially uneven
Electrostatic signal characterization value measurement error, it can be directly used for power station pulverized coal preparation system coal dust Balance route；
2nd, annulus electrostatic transducer is arranged in pipeline outer wall, belongs to contactless or non-intervention type measurement, therefore, convection body
Flow condition interference it is small, and electrostatic transducer measuring system does not interfere with the flow field of detected fluid, will not cause pipeline yet
The extraneoas loss of interior pressure.
Brief description of the drawings
Fig. 1 is the schematic diagram of power station powder induction system pulverized coal flow electrostatic measuring device；
Fig. 2 is the schematic diagram of circular array electrostatic transducer measurement head；
Wherein, 1- isolated pipes；Circular electrostatic transducer narrow 2-；Circular electrostatic transducer wide 3-；4- is shielded
Cover；5- insulating barriers；6- adpting flanges；7- signal conditioning circuits；8- data collecting cards；9- computers, L are two narrow circular quiet
The distance between electric transducer, L1 are the distance between narrow circular electrostatic transducer and wide circular electrostatic transducer.
Embodiment
Embodiment
Power station powder induction system pulverized coal flow electrostatic measurement characterizing method, takes one section of isolated pipe, in isolated pipe
The different circular electrostatic transducer of electrode width is arranged on outer wall, and between the narrow circular electrostatic transducer of both end of which
Away from for L, axial direction distribution of the circular electrostatic transducer along isolated pipe, the electrostatic signal that circular electrostatic transducer is detected
By amplification, after being gathered by data collecting card, carry out calculating processing using correlation method and draw the speed of pulverized coal particle, and lead to
Cross and calculate the ratio between wide circular electrostatic transducer and narrow circular electrostatic transducer electrostatic signal virtual value C, in pipeline
The concentration of pulverized coal particle is characterized, and pulverized coal particle flow characterization value Q is calculated by C and solid particle speed v.When gas-solid two
When mutually stream electrostatic signal is weaker, wide circular electrostatic transducer can normal work, but narrow circular electrostatic transducer connects
The collection of letters number is too weak, and surveying data accuracy and stability can not be protected, in addition, the spatial distribution of pulverized coal particle is also led to
The deviation of electrostatic transducer output signal is now effective using two circular electrostatic transducer electrostatic signals of width Different electrodes
The ratio of value, the Stability and veracity of flow characterization value is effectively improved, it is equal to can be directly used for power station pulverized coal preparation system coal dust
Weighing apparatus control.
1 and Fig. 2 with reference to the accompanying drawings, more detailed description is made to specific embodiments of the present invention：
1) three circular electrostatic transducers are axially mounted to the outer wall of isolated pipe 1, wherein wide circular electrostatic
The electrode axial length of sensor is 5cm, and the electrode axial length of narrow circular electrostatic transducer is 1cm, two electrode annulus
Shape is all made up of the thick copper sheets of 0.2mm.An insulating barrier 3 is covered outside electrode, and is by brass thick 1mm outside insulating barrier
Radome 4 made of piece, for shielding external electromagnetic interference.Spacing between two narrow electrodes is L=10cm.Due to pulverized coal particle
Charged signals it is relatively weak, cause the input signal of induced signal on electrostatic attraction electrode and preamplifier smaller, so
Radome is reliably grounded, to ensure its shield effectiveness.Then being changed into electrostatic induction signal by signal conditioning circuit 7 can
The signal gathered by data collecting card 8, and computer 9 is sent into by data collecting card.
2) in computer, to the three groups of electrostatic signal data collected, including 2 groups narrow electrode electrostatic signal is respectively { x
(i), i=1,2 ... N }, { y (i), i=1,2 ... N } and 1 group wide electrode output signal be { z (i), i=1,2 ... N }, calculate respectively
Virtual value X, Y, the Z gone out in circular electrostatic transducer output signal collection period T.
Wherein, N is the number of the electrostatic signal data point of collection in cycle T.
3) ratio C for the electrostatic signal virtual value that the different circular electrostatic transducer of width is surveyed is calculated.Utilize electrostatic
Signal virtual value ratio C, the concentration of pulverized coal particle in the pipeline in pipeline is characterized, to improve the accuracy of measurement data
And stability.
4) according to " solidification " pattern of fluid it is assumed that the electrostatic signal { x exported using two narrow circular electrostatic transducer
(i), i=1,2 ... N }, { y (i), i=1,2 ... N }, with reference to cross-correlation method, calculate coal dust and flow through two narrow annulus electrostatic transducers
Delay time T：
Wherein, R (n) is electrostatic signal { x (i), i=1,2 ... N } and the cross-correlation function of { y (i), i=1,2 ... N }, and n is
The points of delay.
If R (n) has maximum at n=m, then delay time T:
τ=m Δs t (6)
Wherein, Δ t is electrostatic signal sampling time interval, and m is that there is R (n) delay at maximum to count.
5) by the spacing L between known two narrow circular ring electrodes, pulverized coal particle flow velocity degree ν in pipeline is calculated：
6) the pulverized coal flow characterization value Q for flowing through electrostatic transducer measurement head is calculated：
Q=Cv (8)
It is shown referring to Figures 1 and 2, for power station powder induction system pulverized coal flow electrostatic measurement characterization apparatus, including circle
Annular array electrostatic transducer measurement head, signal conditioning circuit, data collecting card and computer.Circular array electrostatic sensing
Device measurement head includes radome, isolated pipe, insulating barrier, two narrow circular ring electrodes with a, wide circular ring electrode and two
Individual adpting flange.
The principle of the present invention is as follows：
The course of work of instrument is：First against pulverized coal particle, space and VELOCITY DISTRIBUTION are uneven in pipeline, the present invention
Using wide circular electrostatic transducer and narrow circular electrostatic transducer electrostatic signal virtual value ratio C, to coal in pipeline
Powder particles concentration is characterized.Then the electrostatic signal of two narrow circular electrostatic transducer detections is handled using correlation method,
The delay time T between two groups of signals is calculated, in two narrow circular electrostatic transducer distance L, it is known that in the case of, Ke Yiji
The speed v of solid particle in Dual-Phrase Distribution of Gas olid is calculated, the characterization value Q of pulverized coal flow in pipeline then can be calculated, improve
The stability and accuracy of measurement data, described device have the advantages that cost it is low, to powder flowing undisturbed, can directly use
In power station pulverized coal preparation system coal dust Balance route.
Claims (2)
1. one kind is used for power station powder induction system pulverized coal flow electrostatic measurement characterizing method, it is characterised in that step is as follows：
Step 1: the pipeline axial direction flowed through along coal dust, sets three groups of annular shape array electrostatic transducers on pipeline outer wall, wherein
Occupy both sides two groups of width is identical and width less than middle one group, and pass through three groups of annular shape array electrostatic transducers and examine
Three groups of electrostatic signal data are measured, wherein occuping the electrode electrostatic signal difference of two groups of annular shape array electrostatic transducers of both sides
For { x (i), i=1,2 ... N } and { y (i), i=1,2 ... N }, the electrode electrostatic letter of middle one group of annular shape array electrostatic transducer
Number it is { z (i), i=1,2 ... N }, calculates virtual value X, Y, Z of three groups of annular shape electrostatic transducer output signals respectively：
<mrow>
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<mo>=</mo>
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<mn>1</mn>
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</mrow>
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</msqrt>
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Wherein, N is the number of electrostatic signal data sampling point；
Step 2: using virtual value X, Y, Z for calculating three groups of annular shape electrostatic transducer output signals, calculate and obtain both sides
The ratio C of circular electrostatic transducer and middle circular electrostatic transducer output signal virtual value, as coal dust in pipeline
The characterization value of concentration：
<mrow>
<mi>C</mi>
<mo>=</mo>
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<mn>2</mn>
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</mfrac>
</mrow>
Step 3: using the output of the two groups of annular shape electrostatic transducers in both sides electrostatic signal { x (i), i=1,2 ... N } and y (i),
I=1,2 ... N }, with reference to cross-correlation method, the delay time T that coal dust flows through the two groups of round loop electrode sensors in both sides is calculated, and by two
Spacing L between the annular shape electrostatic transducer of two groups of side, calculates pulverized coal particle flow velocity degree ν in pipeline：
<mrow>
<mi>v</mi>
<mo>=</mo>
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<mi>L</mi>
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</mfrac>
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Step 4: calculate the pulverized coal flow characterization value for flowing through three groups of annular shape array electrostatic transducers：
Q=Cv
Wherein, Q is pulverized coal flow characterization value.
2. according to claim 1 be used for power station powder induction system pulverized coal flow electrostatic measurement characterizing method, its feature
It is, delay time T is：
τ=m Δs t
Wherein, Δ t is electrostatic signal sampling time interval, and m is that there is R (n) delay at maximum to count, and R (n) is that electrostatic is believed
The cross-correlation function of number { x (i), i=1,2 ... N } and { y (i), i=1,2 ... N },
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<mo>&rsqb;</mo>
</mrow>
Wherein, n is the points of delay.
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