CN110186826A - A kind of pulverized coal preparation system, the device and method for detecting coal powder density and partial size - Google Patents
A kind of pulverized coal preparation system, the device and method for detecting coal powder density and partial size Download PDFInfo
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- CN110186826A CN110186826A CN201910620028.8A CN201910620028A CN110186826A CN 110186826 A CN110186826 A CN 110186826A CN 201910620028 A CN201910620028 A CN 201910620028A CN 110186826 A CN110186826 A CN 110186826A
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- 239000003245 coal Substances 0.000 title claims abstract description 90
- 239000000843 powder Substances 0.000 title claims abstract description 54
- 238000000034 method Methods 0.000 title claims abstract description 41
- 238000002360 preparation method Methods 0.000 title claims abstract description 14
- 238000001514 detection method Methods 0.000 claims abstract description 163
- 238000012360 testing method Methods 0.000 claims abstract description 85
- 238000007789 sealing Methods 0.000 claims abstract description 83
- 239000002817 coal dust Substances 0.000 claims abstract description 75
- 239000000523 sample Substances 0.000 claims description 87
- 230000005540 biological transmission Effects 0.000 claims description 18
- 230000003287 optical effect Effects 0.000 claims description 16
- 239000013307 optical fiber Substances 0.000 claims description 12
- 238000012545 processing Methods 0.000 claims description 11
- 239000003818 cinder Substances 0.000 claims description 3
- 238000007689 inspection Methods 0.000 claims description 3
- 238000010586 diagram Methods 0.000 description 12
- 239000002245 particle Substances 0.000 description 10
- 230000008569 process Effects 0.000 description 9
- 230000033001 locomotion Effects 0.000 description 6
- 238000010276 construction Methods 0.000 description 4
- 238000002485 combustion reaction Methods 0.000 description 3
- 238000004891 communication Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000005259 measurement Methods 0.000 description 3
- 238000012544 monitoring process Methods 0.000 description 3
- 238000005070 sampling Methods 0.000 description 3
- 230000002411 adverse Effects 0.000 description 2
- 238000006073 displacement reaction Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000005622 photoelectricity Effects 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 238000003556 assay Methods 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000008033 biological extinction Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000001427 coherent effect Effects 0.000 description 1
- 238000004939 coking Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000001739 density measurement Methods 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 230000008676 import Effects 0.000 description 1
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- 238000010926 purge Methods 0.000 description 1
- 239000010453 quartz Substances 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume, or surface-area of porous materials
- G01N15/02—Investigating particle size or size distribution
- G01N15/0205—Investigating particle size or size distribution by optical means, e.g. by light scattering, diffraction, holography or imaging
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume, or surface-area of porous materials
- G01N15/06—Investigating concentration of particle suspensions
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- G01N15/075—
Abstract
The invention discloses a kind of devices for detecting coal powder density and partial size, including the test section to protrude into primary air inlet and detect coal powder density and partial size in the primary air inlet；It is connected with the test section, to drive the test section to protrude into and leave the power part of the primary air inlet；It is sealed between the test section and the primary air inlet and to be connected with the primary air inlet and be realized when detecting when without avoiding the sealing that coal dust outwardly leaks in the primary air inlet when detecting.Above-mentioned apparatus can quickly detect the concentration and partial size of coal dust at whole measuring points in primary air inlet, solve the problems, such as that detection efficiency is low and cannot achieve on-line checking.In addition, the invention also discloses a kind of pulverized coal preparation systems including above-mentioned apparatus and a kind of method for detecting coal powder density and partial size.
Description
Technical field
The present invention relates to coal dust monitoring technical fields, more particularly to a kind of device for detecting coal powder density and partial size.This
Outside, the invention further relates to a kind of pulverized coal preparation system including above-mentioned apparatus and a kind of methods for detecting coal powder density and partial size.
Background technique
The coal dust of required burning is usually ground by the coal pulverizer in pulverized coal preparation system in coal-burning boiler, pulverized coal preparation system master
It is divided into unit pulverized-coal system and intermediate storage-type pulverized coal preparation system, either any system is required to be arranged a plurality of primary
Wind powder pipe burns the burner that the coal dust in coal pulverizer imports in coal-burning boiler, due to the structure of every primary air inlet
(such as length and elbow quantity) is different, therefore it is non-uniform existing to will cause coal powder density distribution in every primary air inlet
As, and then the adverse consequences that the flame kernel deviation, coking, combustion instability and the efficiency of combustion that will lead to burner is low, and
The granular size of coal dust also will affect the combustion case of burner.
In order to accurately obtain the mean concentration of coal dust in primary air inlet, need that multiple surveys are arranged in primary air inlet
Point, current common practice are sampled to the coal dust at each measuring point, calculated according to the coal dust amount of sampling coal dust it is dense
Degree, but also can be according to the partial size of the sample acquisition coal dust of sampling, but this method can not achieve on-line monitoring, and according to
Lai Yu manual operation, and then there is the defect for the inefficiency such as the operating time is long and operating process is many and diverse.
Therefore, how quickly to detect the concentration of coal dust and partial size in primary air inlet is that those skilled in the art urgently solve
Certainly the problem of.
Summary of the invention
The object of the present invention is to provide a kind of device for detecting coal powder density and partial size, which can quickly detect one
In secondary wind powder pipe at whole measuring points coal dust concentration and partial size, it is low and cannot achieve asking for on-line checking to solve detection efficiency
Topic.It is a further object of the present invention to provide a kind of pulverized coal preparation systems including above-mentioned apparatus and a kind of detection coal powder density and partial size
Method.
To achieve the above object, the present invention provides a kind of device for detecting coal powder density and partial size, comprising: to protrude into one
Secondary wind powder pipe is interior and detects the test section of coal powder density and partial size in the primary air inlet；Be connected with the test section, to
The test section is driven to protrude into and leave the power part of the primary air inlet；To be connected and work as with the primary air inlet
Sealing between the test section and the primary air inlet is realized when detection and avoids the primary air inlet when being not necessarily to and detecting
The sealing that interior coal dust outwardly leaks.
Preferably, the test section includes: detection probe in a tubular form；Wherein, the first end of the detection probe to
Across the sealing and the primary air inlet is protruded into, and the first end of the detection probe is equipped with the detection circulated for coal dust
Through-hole, the second end of the detection probe are connected with the power part；It is connected with the detection probe, to logical to the detection
The Laser emission sub-portion of hole transmitting laser；It is connected with the detection probe, to receive across the laser for detecting through-hole simultaneously
Calculate the transmission light processing sub-portion of coal powder density and partial size.
Preferably, the Laser emission sub-portion includes: the laser emitter to emit laser；Set on the detection probe
Optical fiber interior, to the laser conduction that issues the laser emitter to the detection probe first end；Set on the detection
The first end of probe simultaneously connect with the optical fiber, leads to receive laser and be corrected for a branch of directional light irradiation detection
The laser aligner in hole；It is described transmission light processing sub-portion include: set on the detection probe first end, to receive transmission in
The laser of the detection through-hole and the photoelectric converter for being translated into electric signal；Be electrically connected with the photoelectric converter, to
Obtain the electric signal that the photoelectric converter issues and the signal processor that coal powder density and partial size is calculated；Wherein, described
Photoelectric converter and the laser aligner are divided into the two sides of the detection through-hole, and the laser aligner is relative to described
First end of the photoelectric converter far from the detection probe.
Preferably, the test section further include: set on it is described detection through-hole close to the laser aligner side, to
Avoid the first optical mirror slip that the laser aligner is contacted with coal dust；Set on the detection through-hole close to the photoelectric converter
Side, with the second optical mirror slip contacted to avoid the photoelectric converter with coal dust.
Preferably, the sealing includes: to be connected to the primary air inlet and with so that the detection probe passes through simultaneously
Protrude into the tube socket in the primary air inlet；In the tube socket, opened when needing to detect for detection spy
Needle successively protrudes into the tube socket and the primary air inlet, when without closing the valve body to avoid leakage of pulverized coal when detecting；With institute
Tube socket is stated to be connected, to avoid the sealer of leakage of pulverized coal when the valve body is opened.
Preferably, the sealer includes: the sealed bolster only to pass through for the detection probe；With the tube socket phase
Even, the sealing support to support the sealed bolster；It is connected, with the sealing support to the close of the fixation sealed bolster
Capping；Wherein, the sealing support and the sealing cover are divided into the two sides of the sealed bolster to clamp the sealed bolster
Edge.
Preferably, the power part includes: the movable stand being connected with the detection probe second end；With the movable stand phase
Even, the guide part to limit the movable stand moving direction；It is connected with the guide part, the branch to support the guide part
Support seat；The power source moved to realize the movable stand along the guide part.
Preferably, the guide part is specially lead screw；The power source is specially motor, and the motor and the lead screw
It is connected to drive the lead screw to rotate；The movable stand has the nut seat to cooperate with the lead screw.
Relative to above-mentioned background technique, the device of detection coal powder density and partial size provided by the invention is driven by power part
Dynamic test section successively reaches at each measuring point in primary air inlet the concentration and partial size for obtaining coal dust.Specifically, when
When needing to detect, sealing is opened, power part driving test section successively protrudes into sealing and primary air inlet, and drives test section
The measuring point in primary air inlet is reached, drives test section to reach after detecting to the measuring point again and is examined at next measuring point
Survey, until test section completes the detection at whole measuring points, and during detection, sealing remain primary air inlet with
Sealing between test section outwardly leaks to avoid coal dust in the detection process；When it is not necessary that when detecting, power part driving is detected
Primary air inlet and sealing successively leave in portion, and the flowing for influencing coal dust is trapped in primary air inlet to avoid test section, then
Sealing is closed, to avoid the leakage of pulverized coal in primary air inlet.
The present invention also provides a kind of pulverized coal preparation systems, comprising: coal cinder to be ground to the coal pulverizer of coal dust；With the coal-grinding
Machine be connected, the primary air inlet to enter burner for coal dust；It is connected with the coal pulverizer, coal dust is blown into described one
The blower of secondary wind powder pipe；It is connected with the primary air inlet, the dress of detection coal powder density and partial size as described in any one of the above embodiments
It sets.
The present invention also provides a kind of methods for detecting coal powder density and partial size, comprising: S1: opening sealing；S2: driving inspection
Survey portion protrudes into primary air inlet；S3: driving the test section to reach at the measuring point not detected in the primary air inlet, and
Acquisition testing data are to obtain the partial size and concentration of coal dust at current measuring point；S4: judge whole surveys in the primary air inlet
Whether point is completed to detect, if it is not, step S3 is then back to, if so, entering step S5；S5: drive the test section successively from
Open the primary air inlet and the sealing；S6: the sealing is closed.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
The embodiment of invention for those of ordinary skill in the art without creative efforts, can also basis
The attached drawing of offer obtains other attached drawings.
Fig. 1 is a kind of structural schematic diagram of the device of detection coal powder density and partial size provided by the present invention；
Fig. 2 is the structural schematic diagram of the first test section provided by the present invention；
Fig. 3 is the structural schematic diagram of second of test section provided by the present invention；
Fig. 4 is the structural schematic diagram of sealing in Fig. 1；
Fig. 5 is the structural schematic diagram of power part in Fig. 1；
Fig. 6 is the schematic diagram of measuring point distribution in primary air inlet provided by the present invention；
Fig. 7 is the flow chart of a kind of method of detection coal powder density and partial size provided by the present invention；
Wherein,
01- primary air inlet, 011- measuring point, 1- detection probe, 11- detection through-hole, 12- laser emitter, 13- optical fiber,
14- laser aligner, 15- photoelectric converter, 16- conducting wire, 17- signal processor, 171- signal picker, 172- host computer,
The first optical mirror slip of 18-, the second optical mirror slip of 19-, 2- sealing, 21- tube socket, 22- valve body, 23- sealer, 231- sealing branch
Seat, 232- sealed bolster, 233- sealing cover, 3- power part, 31- movable stand, 32- guide part, 33- support base, 34- power source,
35-PLC controller.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that the described embodiment is only a part of the embodiment of the present invention, instead of all the embodiments.Based on this
Embodiment in invention, every other reality obtained by those of ordinary skill in the art without making creative efforts
Example is applied, shall fall within the protection scope of the present invention.
In order to make those skilled in the art more fully understand the present invention program, with reference to the accompanying drawing and it is embodied
The present invention is described in further detail for mode.
Fig. 1 to Fig. 7 is please referred to, Fig. 1 is a kind of structure of the device of detection coal powder density and partial size provided by the present invention
Schematic diagram；Fig. 2 is the structural schematic diagram of the first test section provided by the present invention；Fig. 3 is second provided by the present invention
The structural schematic diagram of test section；Fig. 4 is the structural schematic diagram of sealing in Fig. 1；Fig. 5 is the structural schematic diagram of power part in Fig. 1；
Fig. 6 is the schematic diagram of measuring point distribution in primary air inlet provided by the present invention；Fig. 7 is a kind of detection coal provided by the present invention
The flow chart of powder concentration and the method for partial size.
It is provided by the present invention it is a kind of detect coal powder density and partial size device, as shown in Figure 1, the device include: for
Protrude into the test section that in primary air inlet 01 and the concentration to coal dust in primary air inlet 01 and partial size are detected；For driving
Test section protrudes into and leaves the power part 3 of primary air inlet 01；For avoid in the detection process with detection after First air
The sealing 2 that coal dust outwardly leaks in tube cell 01.
Power part 3 is connect to drive test section to move with test section, in the detection process, power part 3 drive test section according to
It is secondary to protrude into sealing 2 and primary air inlet 01, and further driving test section reaches the measuring point 011 in primary air inlet 01, with
Concentration and partial size of the detection coal dust at the measuring point 011 online, after detecting to the measuring point 011, then drives test section to arrive
Up to next measuring point 011, until completing the detection at whole measuring points 011；When without detect when, power part 3 drive test section according to
It is secondary to leave primary air inlet 01 and sealing 2, the flowing that influences coal dust is stranded in primary air inlet 01 to avoid test section.
Sealing 2 for being connected with primary air inlet 01, in sealing 2 with can for the channel that test section passes through, when
When needing to detect, opening sealing 2 is connected to the channel with primary air inlet 01, and test section is made to be able to enter primary air inlet 01
Interior, during detection, sealing 2 remains the sealing between test section and primary air inlet 01, lets out to avoid coal dust
Leakage, and then guarantee that test section can obtain the accurate testing result of coal powder density；When completion detection and test section withdraws from sealing 2
When, sealing 2 is closed to be closed the above-mentioned channel being connected to primary air inlet 01, is outwardly leaked to avoid coal dust.
As can be seen that the present apparatus drives test section mobile by power part 3 to realize test section in primary air inlet 01
On-line checking at multiple measuring points 011, to solve to need in the prior art to take out coal dust sample and offline from primary air inlet 01
The problem of obtaining the concentration and partial size of coal dust likes, and after detection power part 3 can also the portion of will test withdraw from once
Wind powder pipe 01 is stranded in primary air inlet 01 and is influenced to avoid test section the flow field in primary air inlet 01, and then reduces
Manually-operated movement makes the efficiency of detection and accuracy get a promotion.It was being detected in addition, sealing 2 can also ensure that
Sealing in journey between primary air inlet 01 and test section causes coal powder density measurement data not smart to avoid because of leakage of pulverized coal
Quasi- situation, sealing 2 can also ensure that the sealing to primary air inlet 01 upon completion of the assays, outwardly let out to avoid coal dust
Leakage.
In other words, the core of the present apparatus has two: first is that realizing that driving test section reaches each measuring point using power part 3
It carries out on-line checking and test section being driven to withdraw from primary air inlet 01 at 011, the other is in the detection process and completing inspection
After survey, guarantee that the coal dust in primary air inlet 01 will not be leaked outwardly by sealing 2.
It should be noted that distribution situation of the coal dust in primary air inlet 01 in order to avoid different-grain diameter is different,
While to coal powder density detection is carried out at each measuring point 011, the coal particle size at each measuring point 011 should also be detected,
For testing staff know coal pulverizer grinding effect how.
Specific embodiment below is provided herein for the structure construction of test section:
Test section specifically includes that detection probe 1, Laser emission sub-portion and transmission light processing sub-portion.
In order to avoid detection probe 1 is larger to the flow in primary air inlet 01, as shown in Figures 1 to 5, detection is visited
Needle 1 is preferably designed for circular tube shaped, and the first end of detection probe 1 is used to across sealing 2 and protrudes into primary air inlet 01, namely
The first end of detection probe 1 is used to be contacted with coal dust to realize the detection to coal powder density and partial size；Coal dust is joined in order to realize
Several detections opens up the detection through-hole 11 for keeping for coal dust its original flow direction in the first end of detection probe 1, namely to flowing through
The coal dust that the detection through-hole 11 is formed by measured zone carries out the on-line checking of concentration and partial size；And the second of detection probe 1
End is connected with power part 3, to realize that power part 3 drives detection probe 1 to protrude into and withdraw primary air inlet 01.
Laser emission sub-portion is connected with detection probe 1, and Laser emission sub-portion is used to be formed by above-mentioned detection through-hole 11
Measured zone emits the laser of certain wavelength and intensity, and the laser direct projection is made to flow through the coal dust of the measured zone.And it is visited with detection
The connected transmission light processing sub-portion of needle 1 is used to receive the transmission laser by above-mentioned measured zone, to obtain the transmission laser
The information such as intensity and the concentration and partial size that coal dust at current measuring point 011 is calculated according to these information.
It should be noted that it is above-mentioned using Laser emission sub-portion and transmission light processing sub-portion come simultaneously detect coal powder density with
Method used by partial size is light transmission rate Fluctuation Method, and the principle of this method is: incident light can occur when passing through particle media
The phenomenon that scattering and absorption, transmitted light attenuation degree formula are as follows:
In formula, I0By the light intensity for the incident light that Laser emission sub-portion issues, I is received for transmission light processing sub-portion
The light intensity of light is penetrated, A is the sectional area for detecting through-hole 11 and being formed by measured zone, and n is the pulverized coal particle number in measured zone, D
For the partial size of pulverized coal particle, E is particle extinction coefficient, and λ is the wavelength of incident light, and π is pi, and m is the refractive index of coal dust.
When above-mentioned measured zone very little, the numbers of particles and partial size for flowing through detection through-hole 11 change at random, transmit
The light intensity I of light pulses passage at any time, and the random pulse of transmitted light is located at measured zone in detection moment
Interior pulverized coal particle number n is related with partial size D, and then can calculate coal dust according to the formula of above-mentioned smooth percent of pass Fluctuation Method
Grain number n and partial size D, and then calculate coal dust concentration.
More specifically, in order to realize the testing conditions of above-mentioned smooth percent of pass Fluctuation Method, as shown in Figures 2 and 3, laser
Emitting sub-portion includes: laser emitter 12, optical fiber 13 and laser aligner 14.Laser emitter 12 is for issuing certain wavelength
Laser, and optical fiber 13 defaults in detection probe 1 and draws from the second end of detection probe 1 and connect with laser emitter 12,
It is conducted with the incident light for being issued laser emitter 12 to the first end of detection probe 1, laser aligner 14 is then that setting exists
The first end of detection probe 1 is simultaneously connect with optical fiber 13, and the Laser corrective that optical fiber 13 is transferred out is a branch of directional light, makes this
Beam directional light exposes to measured zone.And in order to realize long range and stable beam conduction, above-mentioned optical fiber 13 is preferably single
Mode fiber, to improve the accuracy of testing result, wherein single mode optical fiber is a kind of optical fiber that can only conduct one mode,
Its intermode dispersion is small, therefore is suitable for telecommunication.
And transmiting light processing sub-portion includes: photoelectric converter 15 and signal processor 17.Set on 1 first end of detection probe
Photoelectric converter 15 is formed by the transmitted light of measured zone in above-mentioned detection through-hole 11 for receiving transmission, and will include
The optical signal for penetrating the information such as light light intensity is converted into electric signal and sends, and signal processor 17 is electrically connected with photoelectric converter 15
It connects, to receive the electric signal that photoelectric converter 15 is issued, and parses the information such as transmitted light light intensity contained in the electric signal,
And then the concentration and partial size of coal dust are obtained according to above- mentioned information.
Further specifically, as shown in Figures 2 and 3, be preset with conducting wire 16 in detection probe 1, one end of the conducting wire 16 with
Photoelectric converter 15 connects, and the other end of conducting wire 16 draws from the second end of detection probe 1 and is connected with signal processor 17,
To realize being electrically connected for photoelectric converter 15 and signal processor 17.Above-mentioned signal processor 17 includes: 171 He of signal picker
Host computer 172, signal picker 171 resolve to the electric signal for receiving the electric signal that photoelectric converter 15 is issued
Digital signal, and then digital signal is passed into host computer 172 by data line, host computer 172 is then according to its received number
The concentration and partial size of coal dust is calculated in the parameters such as the light intensity and wavelength of signal and incident light.
It should be noted that the mode that above-mentioned host computer 172 obtains the parameter of incident light can be sent out for preparatory typing laser
The parameter for the incident light that emitter 12 is issued can also be connect by data line with laser emitter 12 to obtain incident light in real time
Parameter.
It is understood that as shown in Figures 2 and 3, above-mentioned photoelectric converter 15 and laser aligner 14, which should set up separately, to be examined
The two sides for surveying through-hole 11 make laser issue from the side of measured zone and receive from the other side, and preferably, compared to photoelectricity
Converter 15, the position of laser aligner 14 is far from the first end of detection probe 1.
For superior technique effect, as shown in figure 3, above-mentioned test section further include: be set to detection through-hole 11 close to laser
First optical mirror slip 18 of 14 side of collimator, and set on detection through-hole 11 close to the second optical frames of 15 side of photoelectric converter
Piece 19.First optical mirror slip 18 is used to separate the coal dust flowed in measured zone and laser aligner 14, to avoid
Coal dust impact laser aligner 14 simultaneously causes laser aligner 14 the case where damages such as block and pollute occur；Similarly, second
Optical mirror slip 19 is separated for that will flow coal dust in measured zone with photoelectric converter 15, impacts photoelectricity to avoid coal dust
Converter 15 simultaneously causes photoelectric converter 15 the case where damages such as block and pollute occur.Wherein, above-mentioned first optical mirror slip
18 and second optical mirror slip 19 high temperature resistant, wear-resisting and light transmission can be used good quartz is made.
For present embodiment it should be noted that in addition to realized using light transmission rate Fluctuation Method coal powder density and
The detection of partial size, test section can also be can be using the component of other structures and principle come the concentration and partial size progress to coal dust
Detection, such as the successively coal powder density and coal particle size in measurement primary air inlet 01 at whole measuring points 011, namely pass through two kinds
The detection part of measurement coal powder density and coal particle size is respectively used to be detected, wherein the testing principle of coal powder density can
With reference to online test methods such as sonic method in the prior art, capacitance method and thermodynamic methods, and the testing principle of coal particle size
It can refer to the methods of sampling method in the prior art, be no longer specifically described here.
It should also be noted that, so-called herein " online " refer to that test section is detected at arrival measuring point 011
In the process, directly in primary air inlet 01 complete obtain its need the movement of detection parameters, such as the transmitted light in above content
Light intensity I etc.；And realize that the component of " online " detection of test section includes: swashing in Laser emission sub-portion in present embodiment
Photoelectric converter 15 and host computer 172 in optical transmitting set 12 etc., and transmission light processing sub-portion etc..
In addition, according to content documented in this specific embodiment it is found that detection probe 1 is to realize coal powder density and partial size
The medium detected, that is to say, that the process that above-mentioned power part 3 drives test section to protrude into and withdraw from primary air inlet 01 is practical
On be to drive detection probe 1 to protrude into and withdraw from primary air inlet 01, then in other words, the test section in the technical program is answered
It carries out contacting the concentration and partial size that can realize measurement coal dust with coal dust, therefore, no matter utilizes the detection side of which kind of contact
Method measures the concentration and partial size of coal dust, the test section in the technical program should all include detection probe 1 this be used to and coal
The medium of powder contact.
Specific embodiment below is provided herein for the structure construction of sealing 2:
As shown in figure 4, sealing 2 includes: tube socket 21, valve body 22 and sealer 23.Tube socket 21 and primary air inlet 01 connect
It connects, and its internal channel is connected to primary air inlet 01, so that primary wind and powder is protruded into channel of the detection probe 1 in tube socket 21
In pipe 01, and preferably, tube socket 21 is welded in primary air inlet 01；The both ends of valve body 22 are connected with tube socket 21, Ye Jiguan
Seat 21 is equipped with two sections and is divided into the both ends of valve body 22, and is preferably detachably connected by screw thread between valve body 22 and tube socket 21,
Valve body 22 is used to open when needing to detect so that detection probe 1 can successively protrude into tube socket 21 and primary air inlet 01, and works as
When without detecting, namely after detection probe 1 withdraws from primary air inlet 01, valve body 22 is closed logical in tube socket 21 to block
Road, and then the coal dust in primary air inlet 01 is avoided outwardly to leak along tube socket 21；Sealer 23 is connected with tube socket 21, and preferably
It is detachably connected by being threadedly engaged realization, sealer 23 is used for when valve body 22 is opened and detection probe 1 is located in sealing 2
The outer wall of detection probe 1 is wrapped, to avoid the coal dust in primary air inlet 01 between primary air inlet 01 and detection probe 1
It outwardly flows out in gap.
It should be noted that the case where above-mentioned " detection probe 1 is located in sealing 2 " includes: that detection probe 1 protrudes into once
When the process and detection probe 1 of wind powder pipe 01 are not yet withdrawn from from sealing 2 completely.
In order to guarantee the sealing performance after valve body 22 is closed, above-mentioned valve body 22 is preferably ball valve, wherein ball valve has resistance to
Mill, switchs the characteristics of light and long service life at good airproof performance, and the construction and principle of ball valve can refer to the prior art, herein not
It is reinflated.
More specifically, as shown in figure 4, above-mentioned sealer 23 includes: sealed bolster 232, sealing support 231 and sealing
Lid 233.Sealed bolster 232 has the circular hole only passed through for detection probe 1, and the diameter of the circular hole is preferably smaller than examined
The diameter of 1 outer wall of probing needle, to make sealed bolster 232 that flexible deformation occur with reality when detection probe 1 passes through the circular hole
The outer wall of detection probe 1 is now wrapped, and then guarantees sealing performance in the detection process；The side for sealing support 231 is equipped with spiral shell
Line is simultaneously connect with being threadedly engaged for tube socket 21, and sealed bolster 232 is set to the other side of sealing support 231, seals the another of support 231
Side it is also preferred that setting screw thread, and with being threadedly engaged on sealing cover 233, it is soft with the two sides pinch seal from sealed bolster 232
The edge of pad 232, and then realize the fixation of sealed bolster 232.
It should be noted that can be preset between sealing support 231 and sealing cover 233 for being placed for sealed bolster 232
Groove, and the groove can individually be set to one of both sealing support 231 or sealing cover 233, can also be divided into two parts point
Support 231 and sealing cover 233 She Yu not be sealed, and forms above-mentioned groove when the two cooperation；As shown in figure 4, sealing branch
The inside of seat 231 and sealing cover 233 should also be equipped with the channel worn for detection probe 1；Seal support 231 and sealing cover 233 also
It can be by the existing connection type such as the clamping of card slot and buckle come fixing seal cushion 232；Above-mentioned sealed bolster 232 can be adopted
It is made of high temperature resistant, the rubber that wear-resisting and elasticity is good or other materials.
Specific embodiment below is provided herein for the structure construction of power part 3:
As shown in figure 5, power part 3 includes: movable stand 31, guide part 32, support base 33 and power source 34.Movable stand 31
It is connect with the second end of detection probe 1, and is set to guide part 32, the track for keeping detection probe 1 fixed along guide part 32
Mobile, support base 33 is used to support guide part 32, and power source 34 is used to realize that movable stand 31 is moved along guide part 32.
Specifically, when needing to detect, power source 34 drives movable stand 31 to move along guide part 32, makes 31 band of movable stand
Dynamic detection probe 1 protrudes into primary air inlet 01, and when detection through-hole 11 is overlapped with measuring point 011, power source 34 controls movable stand
31 stop motions, after the measuring point 011 detection, it is next that power source 34 drives the movement of movable stand 31 to reach detection probe 1
At measuring point 011, until whole measuring points 011 complete detection, finishes when whole measuring points 011 detect and need to withdraw from detection probe 1
When, power source 34 drives movable stand 31 to move backward along guide part 32, makes movable stand 31 that detection probe 1 be driven to withdraw from primary wind and powder
Pipe 01, to avoid avoid detection complete after detection probe 1 be stranded in primary air inlet 01 influence coal dust flowing.
Preferably, above-mentioned guide part 32 is the lead screw linearly extended, power source 34 is motor and connects with lead screw
It connects, to drive lead screw along rotating clockwise and anticlockwise, movable stand 31 has nut seat and is cooperatively connected with lead screw, and then when electricity
Machine drives lead screw to move movable stand 31 along the extending direction of lead screw when rotating on support base 33, final to realize detection probe 1
Advance and retreat primary air inlet 01.Correspondingly, as shown in fig. 6, multiple measuring points 011 in primary air inlet 01 should be carried out along same straight line
It chooses, so that detection probe 1 can reach at each measuring point 011 along the extending direction of lead screw.
For superior technique effect, as shown in figure 5, the output revolving speed of above-mentioned motor and the control of start and stop preferably pass through
PLC (Programmable Logic Controller, programmable logic controller (PLC)) controller 35 carries out automatically controlling, when
It can also so be carried out using remote operation control or other automation controllers in the prior art come the operating status to motor
Control.Correspondingly, above-mentioned motor preferably uses stepper motor, wherein stepper motor is electric impulse signal can be changed into angle
The opened loop control motor of displacement or displacement of the lines；Certainly, above-mentioned motor can also be controlled using other by PLC controller 35 Deng
The control motor that device is controlled.
In order to realize the coherent control of motor operating state, above-mentioned PLC controller 35 can be with the above-mentioned tool about test section
Host computer 172 in body embodiment is connected, namely when coal powder density and partial size is calculated in host computer 172, PLC controller
35 can be automatically controled motor rotation, and to realize, when not detected there are also measuring point 011, the arrival of control detection probe 1 is not yet completed
At the measuring point 011 of detection, and detection probe 1 is controlled when whole measuring points 011 complete detection and withdraws primary air inlet 01.
It should be noted that in addition to by motor driven lead screw make nut seat it is mobile in the way of other than, power part 3 can also benefit
With Pneumatic guide rail etc., other can control the component of 1 advance and retreat primary air inlet 01 of detection probe and 1 moving direction of detection probe,
Here not reinflated.
A kind of pulverized coal preparation system provided by the present invention, it specifically includes that the coal pulverizer for coal cinder to be ground to coal dust；With
The connected primary air inlet 01 of coal pulverizer enables the coal dust in coal pulverizer to reach burner along primary air inlet 01 and is fired
It burns；The blower being connected with coal pulverizer, blower are used to purge the coal dust in coal pulverizer, enable these coal dusts along primary air inlet 01
Movement is until reach burner；It is connected with primary air inlet 01, the device of detection coal powder density and partial size as described above.
Wherein, the other parts of coal pulverizer, blower, primary air inlet 01 and pulverized coal preparation system can refer to the prior art,
It is not reinflated herein.
A kind of method detecting coal powder density and partial size provided by the present invention, as shown in fig. 7, this method comprises:
Step S1: sealing 2 is opened.It opens manually, remotely control or automatically control and open sealing 2, make in sealing 2
Channel be connected to primary air inlet 01.Specifically according to the above-mentioned embodiment about sealing 2, as shown in figure 4, opening
Valve body 22 (i.e. ball valve), makes the channel in tube socket 21 be in communication with the outside.
Step S2: driving test section protrudes into primary air inlet 01.By remotely controlling power part 3 or by power part 3
It automatically controls to drive test section (i.e. detection probe 1) to pass through the channel in sealing 2 and protrude into primary air inlet 01.
Specifically according to the above-mentioned embodiment in relation to test section and power part 3, as shown in Fig. 2, Fig. 3 and Fig. 5, PLC
35 automatic control motor of controller starts to rotate, and moves movable stand 31 to drive monitoring probe successively to protrude into sealing along lead screw
2 and primary air inlet 01.
Step S3: driving test section reaches at the measuring point 011 not detected in primary air inlet 01, and acquisition testing number
The partial size and concentration of coal dust at current measuring point 011 are obtained accordingly.
Test section is driven to reach primary air inlet by remotely controlling power part 3 or by the automatic control of power part 3
At the measuring point 011 detected in 01, and stop that test section is driven to remain unchanged the position of test section, for test section
Current measuring point 011 is detected to obtain detection data, and the dense of coal dust at current measuring point 011 is obtained according to the detection data
Degree and partial size.
For the above-mentioned specific embodiment in relation to test section and power part 3, as shown in Fig. 2, Fig. 3 and Fig. 5, when
When PLC controller 35 controls motor drive lead screw rotation certain time or revolution, movable stand 31 drives detection probe 1 to be moved to one
At one in secondary wind powder pipe 01 measuring point 011 detected, PLC controller 35 controls motor and shuts down, and makes to detect
The position of detection through-hole 11 at 1 first end of probe is fixed at the measuring point 011, is sent out by Laser emission sub-portion to measured zone
Parallel incident light is penetrated, and optical signal is acquired by photoelectric converter 15 and converts optical signal into electric signal, and signal processing
Device 17 obtains the electric signal and converts electrical signals to digital signal, and current measuring point is calculated according to light transmission rate Fluctuation Method
The concentration and partial size of coal dust at 011.
Step S4: judging whether whole measuring points 011 in primary air inlet 01 are completed to detect, if it is not, being then back to step
S3；If so, entering step S5.If not detected in primary air inlet 01 there are also measuring point 011, it is back to step S3, with
The measuring point 011 for not yet completing detection is detected, until obtaining the coal powder density in primary air inlet 01 at whole measuring points 011
And partial size, and enter step S5.
Step S5: driving test section successively leaves primary air inlet 01 and sealing 2.By remotely control power part 3 or
Test section is driven successively to leave primary air inlet 01 and sealing 2, by the automatic control of power part 3 to avoid detection is completed
Test section (i.e. detection probe 1) is stranded in primary air inlet 01 and adversely affects to the flowing of coal dust afterwards.
For the above-mentioned specific embodiment in relation to test section and power part 3, the control of the PLC as shown in Fig. 2, Fig. 3 and Fig. 5
Device 35 processed controls the reversion of motor driven lead screw, makes movable stand 31 that detection probe 1 be driven to move along the direction for withdrawing primary air inlet 01
It is dynamic, until detection probe 1 is exited from sealing 2 completely.
Step S6: sealing 2 is closed.It is turned off manually, remotely controls or automatically control and close sealing 2, to block sealing
Channel in portion 2 avoids primary air inlet 01 from being in communication with the outside, and then avoids the leakage of pulverized coal in primary air inlet 01.According to
The above-mentioned embodiment about sealing 2 specifically, as shown in figure 4, valve body 22 (i.e. ball valve), to avoid in tube socket 21
Channel be in communication with the outside.
It should be noted that as shown in fig. 7, further including step S0 before above-mentioned steps S3: determining in primary air inlet 01
The distribution of measuring point 011.According to hydromechanical relevant knowledge it is found that the velocity magnitude of fluid radially is distributed difference in pipeline,
Therefore in order to accurately obtain the partial size of the mean concentration of coal dust and coal dust in primary air inlet 01, need along primary air inlet 01
It is arranged radially multiple measuring points 011.
For the above-mentioned specific embodiment in relation to power part 3, as shown in fig. 6, above-mentioned multiple measuring points 011 are along same
Straight line is chosen, and reaches at each measuring point 011 so that test section can move along a straight line.Due to the left and right sides in primary air inlet 01
The parameter of coal dust be possible to different, therefore above-mentioned whole measuring points 011 are preferably distributed along the diametrical direction of primary air inlet 01, and
The position of measuring point 011 is symmetrical relative to the axle center of primary air inlet 01, namely relative to the 011 number phase of measuring point of axle center two sides
Together.
It is determined as shown in fig. 6, the position of above-mentioned measuring point 011 preferably passes through circular ring with constant cross section method, namely relative to
The axle center of primary air inlet 01 constructs multiple adjacent annulus and centrally located circle, the area phase of these annulus and circle
Together, and the intersection point at the edge and 01 diameter of primary air inlet of these annulus and circle is determined as measuring point 011.Certainly, above-mentioned measuring point
011 position can also be chosen according to other modes, no longer be unfolded one by one herein.
In addition, the number of above-mentioned annulus settable four, namely as shown in FIG. 6 ten measuring points 011 are constituted, and certainly, circle
Three, five or other numbers can also be arranged in ring.
About above-mentioned steps S4 it should be noted that for according to the above-mentioned specific embodiment in relation to power part 3, PLC
Controller 35 can be also distributed according to measuring point 011 as shown in FIG. 6 to PLC by the operating status of programming Control motor
Controller 35 is programmed, and is reached detection probe 1 successively at each measuring point 011 to control motor operation and is detected, and to
Whole measuring points 011 are completed to make detection probe 1 withdraw primary air inlet 01 when detection.
In other words, when known to the distribution situation of measuring point 011, visit detection by the pre-set programs of PLC controller 35
It automatically controls detection probe 1 when needle 1 completes the detection of a measuring point 011 to be moved at next measuring point 011, to complete, there are also survey
The judgement that point 011 is not detected；When the last one measuring point 011 is completed to detect, then controls detection probe 1 and remove primary wind and powder
Pipe 01, to realize that the judgement of detection is completed in whole measuring points 011.
Certainly, in this step S4 " judgement " movement can also by the record of field personnel or other understand that
The mode of 011 number of measuring point of detection is completed to realize.
It should be noted that in the description of the present invention, the orientation of the instructions such as used " left side " and " right side " or position are closed
System is merely for convenience of description of the present invention and simplification of the description to be based on the orientation or positional relationship shown in the drawings, rather than limits
Signified element or part must have a particular orientation, therefore be not considered as limiting the invention.In addition, in this explanation
In book, such as first and second etc relational terms are used merely to distinguish an entity and other several entities, and
Without necessarily requiring or implying that there are any actual relationship or orders between these entities.
The device and method of pulverized coal preparation system provided by the present invention, detection coal powder density and partial size have been carried out in detail above
It introduces.Used herein a specific example illustrates the principle and implementation of the invention, the explanation of above embodiments
It is merely used to help understand method and its core concept of the invention.It should be pointed out that for the ordinary skill people of the art
Member for, without departing from the principle of the present invention, can with several improvements and modifications are made to the present invention, these improve and
Modification is also fallen within the protection scope of the claims of the present invention.
Claims (10)
1. a kind of device for detecting coal powder density and partial size characterized by comprising
To protrude into primary air inlet (01) and detect the test section of the primary air inlet (01) interior coal powder density and partial size；
It is connected with the test section, the power part (3) to drive the test section to protrude into and leave primary air inlet (01)；
To be connected with the primary air inlet (01) and realize the test section and the primary air inlet (01) when detecting
Between seal and when without detect when avoid the primary air inlet (01) interior coal dust from outwardly leaking sealing (2).
2. the apparatus according to claim 1, which is characterized in that the test section includes:
Detection probe (1) in a tubular form；Wherein, the first end of the detection probe (1) is to pass through the sealing (2) and stretch
Enter the primary air inlet (01), and the first end of the detection probe (1) is equipped with the detection through-hole (11) to circulate for coal dust, institute
The second end for stating detection probe (1) is connected with the power part (3)；
It is connected with the detection probe (1), to the Laser emission sub-portion to detection through-hole (11) the transmitting laser；
Be connected with the detection probe (1), to receive across it is described detection through-hole (11) laser and calculate coal powder density and
The transmission light processing sub-portion of partial size.
3. the apparatus of claim 2, which is characterized in that
The Laser emission sub-portion includes:
To emit the laser emitter (12) of laser；
Set on the detection probe (1), interior, laser conduction to the detection to issue the laser emitter (12) is visited
The optical fiber (13) of needle (1) first end；
Set on the detection probe (1) first end and connect with the optical fiber (13), be to receive laser and be corrected
The laser aligner (14) of a branch of directional light irradiation detection through-hole (11)；
The transmission light processing sub-portion includes:
Set on the first end of the detection probe (1), to receive transmission in the laser of detection through-hole (11) and by its turn
Turn to the photoelectric converter (15) of electric signal；
Be electrically connected with the photoelectric converter (15), to obtain the photoelectric converter (15) sending electric signal and calculate
The signal processor (17) of coal powder density and partial size out；
Wherein, the photoelectric converter (15) and the laser aligner (14) are divided into the two sides of detection through-hole (11),
And first end of the laser aligner (14) relative to the photoelectric converter (15) far from the detection probe (1).
4. device according to claim 3, which is characterized in that the test section further include:
Set on detection through-hole (11) close to the side of the laser aligner (14), with to avoid the laser aligner
(14) the first optical mirror slip (18) contacted with coal dust；
Set on detection through-hole (11) close to the side of the photoelectric converter (15), with to avoid the photoelectric converter
(15) the second optical mirror slip (19) contacted with coal dust.
5. the apparatus of claim 2, which is characterized in that the sealing (2) includes:
It is connected to the primary air inlet (01) and with so that the detection probe (1) passes through and protrudes into the primary air inlet
(01) tube socket (21) in；
In the tube socket (21), to open when needing to detect so that the detection probe (1) successively protrudes into the pipe
Seat (21) and the primary air inlet (01), when without detect when closing to avoid leakage of pulverized coal valve body (22)；
It is connected with the tube socket (21), the sealer (23) to avoid leakage of pulverized coal when the valve body (22) are opened.
6. device according to claim 5, which is characterized in that the sealer (23) includes:
To the sealed bolster (232) for only detection probe (1) being supplied to pass through；
It is connected with the tube socket (21), the sealing support (231) to support the sealed bolster (232)；
It is connected, with sealing support (231) to the sealing cover (233) of the fixation sealed bolster (232)；
Wherein, sealing support (231) and the sealing cover (233) are divided into the two sides of the sealed bolster (232) to press from both sides
The edge of the tight sealed bolster (232).
7. according to the described in any item devices of claim 2 to 6, which is characterized in that the power part (3) includes:
The movable stand (31) being connected with the detection probe (1) second end；
It is connected with the movable stand (31), the guide part (32) to limit the movable stand (31) moving direction；
It is connected with the guide part (32), the support base (33) to support the guide part (32)；
To realize the movable stand (31) power source (34) mobile along the guide part (32).
8. device according to claim 7, which is characterized in that
The guide part (32) is specially lead screw；
The power source (34) is specially motor, and the motor is connected to drive the lead screw to rotate with the lead screw；
The movable stand (31) has the nut seat to cooperate with the lead screw.
9. a kind of pulverized coal preparation system characterized by comprising
Coal cinder to be ground to the coal pulverizer of coal dust；
It is connected with the coal pulverizer, the primary air inlet (01) to enter burner for coal dust；
It is connected with the coal pulverizer, the blower coal dust to be blown into the primary air inlet (01)；
It is connected with the primary air inlet (01), the dress of detection coal powder density and partial size as claimed in any one of claims 1 to 8
It sets.
10. a kind of method for detecting coal powder density and partial size characterized by comprising
S1: it opens sealing (2)；
S2: driving test section protrudes into primary air inlet (01)；
S3: it drives the test section to reach at the measuring point (011) not detected in the primary air inlet (01), and acquires inspection
Measured data is to obtain the partial size and concentration of coal dust at current measuring point (011)；
S4: judging whether whole measuring points (011) in the primary air inlet (01) are completed to detect, if it is not, being then back to step
S3, if so, entering step S5；
S5: the test section is driven successively to leave the primary air inlet (01) and the sealing (2)；
S6: the sealing (2) are closed.
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| CN201910620028.8A CN110186826A (en) | 2019-07-10 | 2019-07-10 | A kind of pulverized coal preparation system, the device and method for detecting coal powder density and partial size |
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| CN201910620028.8A CN110186826A (en) | 2019-07-10 | 2019-07-10 | A kind of pulverized coal preparation system, the device and method for detecting coal powder density and partial size |
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| CN112649332A (en) * | 2020-12-30 | 2021-04-13 | 东北电力大学 | Power plant coal particle size distribution online detection device and method |
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| CN115144308A (en) * | 2022-05-24 | 2022-10-04 | 华南理工大学 | Device and method for measuring average particle size of pulverized coal |
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