CN207336148U - Isokinetic sample of pulverized coal device - Google Patents
Isokinetic sample of pulverized coal device Download PDFInfo
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- CN207336148U CN207336148U CN201721469239.9U CN201721469239U CN207336148U CN 207336148 U CN207336148 U CN 207336148U CN 201721469239 U CN201721469239 U CN 201721469239U CN 207336148 U CN207336148 U CN 207336148U
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Abstract
The utility model discloses a kind of isokinetic sample of pulverized coal device, including negative pressure ventilation mechanism：For the coal dust in pulverized coal channel to be pumped into sampling tube cavity, including exhaust tube, air ejector is installed between exhaust tube and probe tube；Sample collecting mechanism：For collecting the coal dust entered in probe tube；Electrostatic velocity measurement mechanisms：For the coal dust flow velocity for measuring the coal dust flow velocity in pulverized coal channel and being drawn into probe tube；PID adjusting mechanisms：For adjusting suction pressure in probe tube, make the coal dust flow velocity in coal dust flow velocity and the probe tube in pulverized coal channel equal.The utility model is sampled suitable for a wind pipe coal dust, realizes accurate isokinetic sampling, can reduce sampling error, coal dust sampling is representative, and sampler is simple in structure, easy to operate.
Description
Technical field
It the utility model is related to coal dust sampling technique field, more particularly to a kind of constant-speed sampling device to coal dust.
Background technology
As country steps up thermal power generation unit environmental protection and power conservation requirement, using the big of unit pulverized-coal system
Type unit is widely applied.In unit pulverized-coal system, a coal pulverizer has a more pulverized coal channels at the same time, and each coal dust
The coal dust flow velocity of pipeline, concentration, fineness are there is difference, and these economic parameters moment affect the efficiency of boiler of power plant,
Measure so needing to carry out coal dust accurate sampling in real time, so as to carry out appropriate adjustment and maintenance to boiler plant, carry
The security of high boiler and the economy of power plant's operation.Coal dust sampling be increasingly becoming power plant for energy conservation emission reduction key technology and by
To attention.
Unit pulverized-coal system is measured since there is no pulverized coal bin, it is necessary to extract coal dust sample from pulverized coal channel,
Coal dust sampling at present is that wind powder mixture is taken out from pulverized coal channel using sampling probe, is mixed this part wind powder with separation equipment
Coal dust in compound, which is separated, to be weighed or is sieved, therefore representative coal dust examination how is obtained from pulverized coal channel
Sample becomes the key of work.
When being sampled to the dusty gas of gas-particle two-phase, following four feelings occur in different situations coal dust sampling deviation
Condition：Sample the actual coal dust speed that coal dust speed is equal in pulverized coal channel；Sampling coal dust speed is less than actual coal dust speed；Sampling
Coal dust speed is more than actual coal dust speed；Though sampling, coal dust speed is equal with actual coal dust speed, and sampling probe does not have face
The airflow direction of actual coal dust speed.Three kinds of situations can all make the air-flow streamline near sampling probe import change direction afterwards.
Since the density of the density ratio gas particles of solid particle is much bigger, so when sampling, sampling coal dust speed and actual coal dust
When speed is unequal, solid particle can depart from curved air-flow streamline because of the effect of inertia force, cause sampling error.Only when
When sampling coal dust speed is equal with actual coal dust speed, the quantity and size of samples taken are just consistent with reality.
Practice is sampled by long-term coal dust, it is believed that to ensure coal dust samples' representativeness, it is necessary in accordance with two principle.
It is total cross-section sampling first：As AKOMA constant-speed sampling devices provide that represent point marks off in the circular cross-section of pulverized coal channel
The donut of multiple homalographics, then each annulus is divided into two parts of equal areas, represents point and is uniformly distributed in and is newly divided into
Two donuts line of demarcation on；Secondly isokinetic sampling.Before traditional constant-speed sampling device uses static pressure method, its
Including static pressure balance type isokinetic sampling's elbow type sampling gun, sampling gun front end is equipped with sampling probe, refering to what is shown in Fig. 1, sampling is visited
The first pressure tap 2' is offered on the outside of head 1', for measuring the static pressure p0 of the actual breeze airflow in pulverized coal channel 4' inner cavities, sampling
The second pressure tap 3' is offered on the inside of probe 1', for measuring the static pressure pn of the sampling breeze airflow in sampling probe 1'.If
Think that it is perfect fluid to be sampled gas, without considering the influence of resistance, according to bernoulli's equation：
-- actual coal dust speed, m/s；
-- sampling coal dust speed, m/s；
-- the static pressure of actual breeze airflow, pa；
-- the static pressure of sampling breeze airflow, pa；
-- the gas density in pulverized coal channel, kg/m3;
-- gas density in sampling probe, kg/m3.
Gas is inhaled into that forward and backward temperature is identical, and gas density inside and outside sampling probe 1' is equal ,=.Work as sampling probe
The static pressure of sampling breeze airflow in 1' and the static pressure of the actual breeze airflow outside sampling probe 1' are equal, i.e. ,=when, by above formula
Can obtain=, that is, it is equal with actual coal dust speed to sample coal dust speed, it is possible to achieve isokinetic sampling.
In conjunction with shown in Fig. 1, the sampling probe 1' of above-mentioned isokinetic sample of pulverized coal device stretches into pulverized coal channel 4' inner cavities, when
When one pressure tap 2', the static pressure difference of the second pressure tap 3' inlet are just zero, that is, connect the first pressure tap 2', the second pressure tap
Δ p=0 of differential manometer detection on 3', in steady-state flow, the sum of static pressure and dynamic pressure are constant.Thus the first pressure tap 2' and the
Pressure on two pressure tap 3' is equal, therefore the first pressure tap 2', the air velocity of the second pressure tap 3' inlet and entrance week
The speed enclosed thinks equal, so as to fulfill isokinetic sampling.
But the sampling method of above-mentioned isokinetic sample of pulverized coal device has the following disadvantages：
1st, above-mentioned isokinetic sampling's method is established under the theoretical premise that resistance is ignored, and is difficult into reality
It is vertical；
2nd, due to the first pressure tap 2', the second pressure tap 3' is easily blocked can not realize constant speed, influence the accuracy of sampling；
3rd, in fact pulverized coal channel 4' sections are there is speed difference, so that constant speed process is invalid；
4th, sampling is parallel to pulverized coal channel 4' in the plane that the first pressure tap 2', the second pressure tap 3' and axle center are formed
In air-flow streamline, in other point samplings, certain angle, outermost is presented in the air-flow in sampling probe 1' and pulverized coal channel 4'
Point is in 21 °~23 ° with air-flow, causes sampling error；
5th, when carrying out the horizontal tube sampling of pulverized coal channel 4', when being deposited if there is coal dust, because suction deposition coal dust
It can make sampling amount substantial deviation actual distribution, influence coal dust samples' representativeness；
6th, sampler is complicated, and autobalance and purging design comparison are complicated；The sample time needed during experiment is very
It is long, heavy workload.
Therefore, a kind of new isokinetic sample of pulverized coal device how is developed, it can reduce sampling error, sample coal dust
Representative, simple in structure, easy to operate, this is the problem that the utility model people concentrates on studies.
Utility model content
In order to overcome conventional constant velocity's sampling method there are the defects of, the utility model proposes a kind of new sampling method
And device, including：
Negative pressure ventilation mechanism：For the coal dust in pulverized coal channel to be pumped into the sampling tube cavity of sampling gun, including exhaust tube,
Air ejector is installed between the exhaust tube and probe tube；
Sample collecting mechanism：For sampling the coal dust collected and entered in the probe tube；
Electrostatic velocity measurement mechanisms：For the pulverized coal flow for measuring the coal dust flow velocity in pulverized coal channel and being drawn into the probe tube
Speed；
PID adjusting mechanisms：For adjusting the suction pressure in the probe tube, make the coal dust flow velocity in pulverized coal channel and take
Coal dust flow velocity in sample pipe is equal.
Preferably, the sampling collecting mechanism includes sampling gun, and the probe tube of the sampling gun stretches into the one of pulverized coal channel
End connection sampling probe, the sampling probe are equipped with thief hole, the probe tube other end and at least primary cyclone
Connection, the cyclone separator lower end connects a receiving flask respectively.
Preferably, the front end of the sampling probe is arranged at for flat-head shape or elbow shape or rotation head, the thief hole
The front end of sampling probe, the flat-head shape or elbow shape sampling probe gather pulverized coal channel inner cavity successively by the thief hole
Sample point, the intersection point of multiple homalographic donuts and diameter that the sample point is divided into for pulverized coal channel cross section.
Preferably, lack of gas blowback pipe is further included, the lack of gas blowback pipe is installed between pulverized coal channel and air ejector.
Preferably, the electrostatic velocity measurement mechanisms include two electrostatic transducers, and two electrostatic transducers are installed respectively
On sampling probe front end and probe tube, two electrostatic transducers produce inductive signal by sensing to charged particle, right
Inductive signal is respectively calculated and handles to obtain the coal dust flow velocity in pulverized coal channel and probe tube, then the size flow velocity signal
It is transferred to PID adjusting mechanisms to be adjusted, makes the coal dust flow velocity in pulverized coal channel and probe tube equal.
Preferably, the PID adjusting mechanisms include PID controller and electric control valve, and the electric control valve is installed on
The suspension end of the exhaust tube, the motorized adjustment valve opening are controlled by PID controller, by adjusting the air ejector entrance
Air pressure so that change coal dust suction speed.
Preferably, PLC automatic controls is further included, the PLC automatic controls includes Control PID adjusting mechanism work
Make and the PLC controller of slide unit arrangement works, the slide unit structure includes the slide unit that is arranged in parallel with probe tube, the slide unit with
Push rod is connected between probe tube, the slide unit is connected with the motor controlled by PLC controller, when motor works, drives institute
State the linear motion that probe tube is radially passed in and out along pulverized coal channel.
After using the above scheme, the utility model isokinetic sample of pulverized coal device has following excellent beneficial effect：
1st, coal dust flow velocity in the probe tube of pulverized coal channel and sampling gun is detected by using the electrostatic mode that tests the speed, from
And it is equal in magnitude to adjust two coal dust flow velocitys in real time, realizes real-time isokinetic sampling, this method is overcome in traditional sampling equipment
The shortcomings that online coal dust sampling error, its sampling is representative, improves the accuracy of sampling；
2nd, the utility model isokinetic sample of pulverized coal method is suitable for the sampling of wind, powder two phase flow, and PID is adjusted in whole process
Mechanism can be adjusted according to actual conditions automatic or manual and completed so that pulverized coal channel is equal with the coal dust flow velocity in probe tube, subtracts
Small sampling error, improves the accuracy of sampling；
3rd, the utility model isokinetic sample of pulverized coal apparatus structure is simple, and sample time is short；
4th, the utility model isokinetic sample of pulverized coal device is more by the way that the cross section of pulverized coal channel is divided into by pulse area equal principle
A homalographic donut, diameter are set to sample point, i.e. spot sampling with annulus point of intersection, are controlled and promoted by PLC controller
Push rod, so that push rod promotes probe tube, makes the thief hole on sampling probe rest on successively on sample point, every sampling 2-3
Minute, realize that right place samples within a sampling period, make the sample of acquirement more representative.
Brief description of the drawings
Fig. 1 is the structure diagram that existing isokinetic sample of pulverized coal device is sampled coal dust；
Fig. 2 is one structure diagram of the utility model isokinetic sample of pulverized coal device embodiment；
Fig. 3 is sample point of the sampling probe of the utility model isokinetic sample of pulverized coal device embodiment one in pulverized coal channel
Distribution schematic diagram；
Fig. 4 is two structure diagram of the utility model isokinetic sample of pulverized coal device embodiment；
Fig. 5 is three structure diagram of the utility model isokinetic sample of pulverized coal device embodiment；
Fig. 6 is four structure diagram of the utility model isokinetic sample of pulverized coal device embodiment.
Embodiment
The utility model is illustrated below according to attached drawing illustrated embodiment.This time disclosed embodiment can consider in institute
It is to illustrate to have aspect, without limitation.The scope of the utility model is limited from the explanation of implementation below, only by right
Shown in the scope of claim, and including having all changes in the same meaning and right with right
Shape.
One structure diagram of the utility model isokinetic sample of pulverized coal device embodiment as shown in Figure 2, including：
Negative pressure ventilation mechanism：For the coal dust in pulverized coal channel 1 to be pumped into 2 inner cavity of probe tube of sampling gun, including pumping
Pipe 3, installs negative pressure ventilation device 4 between exhaust tube 3 and probe tube 2；
Sample collecting mechanism：For sampling the coal dust collected and entered in sampling gun probe tube 2, it includes sampling gun, sampling
One end that the probe tube 2 of rifle stretches into pulverized coal channel 1 is fixedly connected with sampling probe 5, and the front end of sampling probe 5 is flat-head shape or curved
Head or rotation head, the front end of the present embodiment sampling probe 5 is flat-head shape.The front end of sampling probe 5 is provided with thief hole 16.
The sampling probe 5 gathers the sample point 17 of 1 inner cavity of pulverized coal channel by thief hole 16 successively, refering to what is shown in Fig. 3, sample point 17 is
The intersection point of multiple homalographic donuts and diameter that the cross section of pulverized coal channel 1 is divided into.Probe tube 2 is located at outside pulverized coal channel 1
The other end connected with least primary cyclone 6, the present embodiment uses two stage cyclone separator 6, two stage cyclone separator 6
Lower end connect a receiving flask 7 respectively；
Electrostatic velocity measurement mechanisms：For the pulverized coal flow for measuring the coal dust flow velocity in pulverized coal channel 1 and being drawn into probe tube 2
Speed, electrostatic velocity measurement mechanisms include two electrostatic transducers 8, two electrostatic transducers 8 be separately mounted to sampling probe 5 front end and
On probe tube 2, two electrostatic transducers 8 produce inductive signal by sensing to charged particle, and phase is carried out respectively to inductive signal
The coal dust flow velocity in pulverized coal channel 1 and probe tube 2 is obtained after the calculating and processing of pass, then the size of flow velocity signal is transferred to
PID adjusting mechanisms are adjusted, and compare two flow velocity signal sizes by PID adjusting mechanisms and adjust in real time in probe tube 2
Suction pressure, makes pulverized coal channel 1 equal with the coal dust flow velocity in probe tube 2, so as to fulfill isokinetic sampling；
PID adjusting mechanisms：For adjusting the suction pressure in probe tube 2, make coal dust flow velocity and sampling in pulverized coal channel 1
Coal dust flow velocity in pipe 2 is equal, and PID adjusting mechanisms include PID controller 9 and solenoid valve 10, and solenoid valve 10 is installed on exhaust tube 3
Suspension end（That is high-speed flow arrival end）, the aperture of solenoid valve 10 controlled by PID controller 9.
The isokinetic sample of pulverized coal method of above-described embodiment includes the following steps：
（1）It is evacuated before sampling by air ejector 4 and 2 inner cavity of probe tube of sampling gun is purged, it is residual removes 2 inner cavity of probe tube
The coal dust stayed, makes the inner cavity of probe tube 2 unimpeded；
（2）Sampling probe 5 by probe tube 2 and thereon is put in 1 inner cavity of pulverized coal channel；
（3）The solenoid valve 10 on exhaust tube 3 is opened, the PID controller 9 of PID adjusting mechanisms is according to two electrostatic transducers 8
Inductive signal calculate coal dust flow velocity V1 size of the difference in coal dust flow velocity V0 and probe tube 2 in pulverized coal channel 1, and hand respectively
The aperture of dynamic adjustment solenoid valve 10, so as to control the suction pressure in probe tube 2 so that the coal in pulverized coal channel 1 and probe tube 2
Powder flow rate is equal；
（4）The thief hole 16 on sampling probe 5 is set to rest on successively on sample point 17, each sample point 17 samples 2-3 points
Clock, realizes that right place samples within a sampling period；
（5）Sampling probe 5 by probe tube 2 and thereon exits pulverized coal channel 1, and sampling process finishes.
Two structure diagram of the utility model isokinetic sample of pulverized coal device embodiment as shown in Figure 4, its most of structure with
The structure of above-described embodiment one is identical, and something in common repeats no more, and is a difference in that：The sampler further includes lack of gas blowback pipe
15, lack of gas blowback pipe 15 is installed between pulverized coal channel 1 and air ejector 4.The port of export of sampling probe 5 and lack of gas blowback pipe 15 is equal
It is made of ceramic wear-resisting material, there is wear-resistant liner on probe tube 2.
The isokinetic sample of pulverized coal method and the sampling method of above-described embodiment one of the present embodiment are essentially identical, simply this implementation
Example makes the complete pulverized coal particle of measurement pass through 15 direct blowback of lack of gas blowback pipe to pulverized coal channel 1 by setting lack of gas blowback pipe 15
It is interior, there is no the leakage of coal dust, realize no pollution.
Three structure diagram of the utility model isokinetic sample of pulverized coal device embodiment as shown in Figure 5, including：
Negative pressure ventilation mechanism：For the coal dust in pulverized coal channel 1 to be pumped into 2 inner cavity of probe tube of sampling gun, including pumping
Pipe 3, installs negative pressure ventilation device 4 between exhaust tube 3 and probe tube 2；
Sample collecting mechanism：For sampling the coal dust collected and entered in sampling gun probe tube 2, it includes sampling gun, sampling
One end that the probe tube 2 of rifle stretches into pulverized coal channel 1 is fixedly connected with sampling probe 5, and the front end of sampling probe 5 is flat-head shape or curved
Head or rotation head, the front end of the present embodiment sampling probe 5 is flat-head shape.The front end of sampling probe 5 is provided with thief hole 16.
The sampling probe 5 gathers the sample point 17 of 1 inner cavity of pulverized coal channel by thief hole 16 successively, refering to what is shown in Fig. 3, sample point 17 is
The intersection point of multiple homalographic donuts and diameter that the cross section of pulverized coal channel 1 is divided into.Probe tube 2 is located at outside pulverized coal channel 1
The other end connected with least primary cyclone 6, the present embodiment uses two stage cyclone separator 6, two stage cyclone separator 6
Lower end connect a receiving flask 7 respectively；
Electrostatic velocity measurement mechanisms：For the pulverized coal flow for measuring the coal dust flow velocity in pulverized coal channel 1 and being drawn into probe tube 2
Speed, electrostatic velocity measurement mechanisms include two electrostatic transducers 8, two electrostatic transducers 8 be separately mounted to sampling probe 5 front end and
On probe tube 2, two electrostatic transducers 8 produce inductive signal by sensing to charged particle, and phase is carried out respectively to inductive signal
The coal dust flow velocity in pulverized coal channel 1 and probe tube 2 is obtained after the calculating and processing of pass, then the size of flow velocity signal is transferred to
PID adjusting mechanisms are adjusted, and compare two flow velocity signal sizes by PID adjusting mechanisms and adjust in real time in probe tube 2
Suction pressure, makes pulverized coal channel 1 equal with the coal dust flow velocity in probe tube 2, so as to fulfill isokinetic sampling；
PID adjusting mechanisms：For adjusting the suction pressure in probe tube 2, make coal dust flow velocity and sampling in pulverized coal channel 1
Coal dust flow velocity in pipe 2 is equal, and PID adjusting mechanisms include PID controller 9 and solenoid valve 10, and solenoid valve 10 is installed on exhaust tube 3
Suspension end（That is high-speed flow arrival end）, the aperture of solenoid valve 10 controlled by PID controller 9.
PLC automatic controls：PLC controller 11 including the work of Control PID adjusting mechanism and slide unit arrangement works, it is sliding
Platform structure includes the slide unit 12 being arranged in parallel with probe tube 2, and push rod 13, slide unit are vertically connected between slide unit 12 and probe tube 2
12 are connected with the motor 14 controlled by PLC controller 11, when motor 14 works, drive the screw conversion inside slide unit 12
The linear motion for being the probe tube 2 and sampling probe 5 that are connected on push rod 13, push rod 13 along 1 radial direction of pulverized coal channel, so as to fulfill from
Dynamic control probe tube 2 passes in and out pulverized coal channel 1；
Lack of gas blowback pipe 15 is further included, lack of gas blowback pipe 15 is installed between pulverized coal channel 1 and air ejector 4.Sampling probe 5
It is made with the port of export of lack of gas blowback pipe 15 by ceramic wear-resisting material, there is wear-resistant liner on probe tube 2.
The isokinetic sample of pulverized coal method of above-described embodiment includes the following steps：
（1）Control solenoid valve 10 to open by PLC controller 11 before sampling, be evacuated by air ejector 4 and 2 inner cavity of probe tube is carried out
Purging, removes the remaining coal dust in 2 inner cavity of probe tube, makes the inner cavity of probe tube 2 unimpeded；
（2）Control motor 14 to work by PLC controller 11, drive radial direction of the push rod 13 on slide unit 12 along pulverized coal channel 1
Move along a straight line, probe tube 2 and sampling probe 5 thereon is entered in pulverized coal channel 1；
（3）The solenoid valve 10 opened on exhaust tube 3, the PID controller of PID adjusting mechanisms 9 are controlled by PLC controller 11
Calculate coal dust flow velocity in coal dust flow velocity V0 and the probe tube in pulverized coal channel respectively according to the inductive signal of two electrostatic transducers 8
V1 size of the difference automatically adjusts the aperture of solenoid valve 10, so as to control the suction pressure in probe tube 2 so that pulverized coal channel 1
It is equal with the coal dust flow velocity in probe tube 2；
（4）The control of PLC controller 11 promotes push rod 13, the thief hole 16 on sampling probe 5 is rested on sample point successively
On 17, each sample point 17 samples 2-3 minutes, realizes that right place samples within a sampling period；
（5）PLC controller 11 controls solenoid valve 10 to close, and PLC controller 11 controls motor 14 to work, and drives on slide unit 12
Push rod 13 move along a straight line along the radial direction of pulverized coal channel 1, probe tube 2 and sampling probe 5 thereon is exited pulverized coal channel
1, sampling process finishes.
The most of structure and above-described embodiment three of the utility model isokinetic sample of pulverized coal device embodiment four as shown in Figure 6
Structure it is identical, something in common repeats no more, and difference is：Probe tube 2 stretches into one end of pulverized coal channel 1 in the present embodiment
Sampling probe 5 is fixedly connected with, the front end of the present embodiment sampling probe 5 is elbow shape.
The step of isokinetic sample of pulverized coal method and step of the present embodiment is with above-described embodiment one is essentially identical, no longer superfluous herein
State.
The sampling probe 5 of above-described embodiment is to be fixedly connected on the tack or elbow of 2 one end of probe tube, sampling probe 5
The swivel head for being connected to probe tube one end can be used, by setting multiple thief holes on swivel head, to pulverized coal channel is horizontal
Section is divided into the sample point that multiple homalographic donuts intersect with diameter and is sampled, and can equally realize that right place takes
Sample.
The utility model examines the coal dust flow velocity in pulverized coal channel 1 and probe tube 2 by using the electrostatic mode that tests the speed
Survey, so that two coal dust flow velocitys of adjustment are equal in magnitude in real time, realize isokinetic sampling, this method is overcome in traditional sampling equipment
The shortcomings that online coal dust sampling error, its sampling is representative, improves the accuracy of sampling；The utility model coal dust constant speed
Sampling method is suitable for the sampling of wind, powder two phase flow, and PID adjusting mechanisms can be according to actual conditions automatic or manual in whole process
Adjust and complete so that pulverized coal channel 1 is equal with the coal dust flow velocity in probe tube 2, reduces sampling error, improves the essence of sampling
True property；The utility model isokinetic sample of pulverized coal apparatus structure is simple, and sample time is short；Its by by pulse area equal principle coal pipe
The cross section in road 1 is divided into multiple homalographic donuts, and diameter is set to sample point 17, i.e. spot sampling with annulus point of intersection, leads to
Cross the control of PLC controller 11 and promote push rod 13 so that push rod 13 promotes probe tube 2, make thief hole 16 on sampling probe 5 according to
Secondary to rest on sample point 17, every samples 2-3 minutes, realizes that right place samples within a sampling period, makes acquirement
Sample is more representative.
Those skilled in the art will readily occur to this practicality after considering specification and putting into practice utility model disclosed herein
New other embodiments.This application is intended to cover any variations, uses, or adaptations of the utility model, these
Variations, uses, or adaptations follow the general principle of the utility model and including it is undocumented in the art
Common knowledge or conventional techniques.Description and embodiments be considered only as it is exemplary, the true scope of the utility model and
Spirit is pointed out by claim.
It should be appreciated that the utility model is not limited to embodiment method, the structure being described above, and attached
The precision architecture shown in figure, and various modifications and changes may be made without departing from the scope thereof.The scope of the utility model
Only limited by appended claim.
Claims (7)
- A kind of 1. isokinetic sample of pulverized coal device, it is characterised in that including：Negative pressure ventilation mechanism：It is described for the coal dust in pulverized coal channel to be pumped into the sampling tube cavity of sampling gun, including exhaust tube Air ejector is installed between exhaust tube and probe tube；Sample collecting mechanism：For sampling the coal dust collected and entered in the probe tube；Electrostatic velocity measurement mechanisms：For the coal dust flow velocity for measuring the coal dust flow velocity in pulverized coal channel and being drawn into the probe tube；PID adjusting mechanisms：For adjusting the suction pressure in the probe tube, make coal dust flow velocity and probe tube in pulverized coal channel Interior coal dust flow velocity is equal.
- 2. isokinetic sample of pulverized coal device according to claim 1, it is characterised in that the sampling collecting mechanism includes sampling Rifle, the probe tube of the sampling gun stretch into one end connection sampling probe of pulverized coal channel, and the sampling probe is equipped with thief hole, The probe tube other end is connected with least primary cyclone, and the cyclone separator lower end connects a collection respectively Bottle.
- 3. isokinetic sample of pulverized coal device according to claim 2, it is characterised in that the front end of the sampling probe is tack Shape or elbow shape or rotation head, the thief hole are arranged at the front end of sampling probe, and the flat-head shape or the sampling of elbow shape are visited Head gathers the sample point of pulverized coal channel inner cavity by the thief hole successively, what the sample point was divided into for pulverized coal channel cross section The intersection point of multiple homalographic donuts and diameter.
- 4. isokinetic sample of pulverized coal device according to claim 3, it is characterised in that lack of gas blowback pipe is further included, it is described weary Gas blowback pipe is installed between pulverized coal channel and air ejector.
- 5. isokinetic sample of pulverized coal device according to claim 1, it is characterised in that the electrostatic velocity measurement mechanisms include two Electrostatic transducer, two electrostatic transducers are separately mounted on sampling probe front end and probe tube, and two electrostatic pass Sensor by charged particle sense produce inductive signal, inductive signal is respectively calculated and processing obtain pulverized coal channel and Coal dust flow velocity in probe tube, then the size of flow velocity signal is transferred to PID adjusting mechanisms and is adjusted, make pulverized coal channel and take Coal dust flow velocity in sample pipe is equal.
- 6. isokinetic sample of pulverized coal device according to claim 1, it is characterised in that the PID adjusting mechanisms are controlled including PID Device and electric control valve processed, the electric control valve be installed on the exhaust tube suspension end, the motorized adjustment valve opening by PID controller is controlled, by adjusting the air pressure of the air ejector entrance, so as to change the speed of coal dust suction.
- 7. isokinetic sample of pulverized coal device according to claim 1, it is characterised in that further include PLC automatic controls, institute Stating PLC automatic controls includes the PLC controller of the work of Control PID adjusting mechanism and slide unit arrangement works, the slide unit knot Structure includes the slide unit being arranged in parallel with probe tube, push rod is connected between the slide unit and probe tube, the slide unit by PLC with being controlled The motor connection of device control processed, when motor works, drives linear motion of the probe tube along pulverized coal channel radial direction disengaging.
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| CN201721469239.9U CN207336148U (en) | 2017-11-07 | 2017-11-07 | Isokinetic sample of pulverized coal device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107664588A (en) * | 2017-11-07 | 2018-02-06 | 北京华清茵蓝科技有限公司 | Isokinetic sample of pulverized coal method and sampler |
| CN109459277A (en) * | 2018-11-22 | 2019-03-12 | 国网浙江省电力有限公司电力科学研究院 | Constant speed control cabinet and its application method applied to portable coal powder sampler |
-
2017
- 2017-11-07 CN CN201721469239.9U patent/CN207336148U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107664588A (en) * | 2017-11-07 | 2018-02-06 | 北京华清茵蓝科技有限公司 | Isokinetic sample of pulverized coal method and sampler |
| CN109459277A (en) * | 2018-11-22 | 2019-03-12 | 国网浙江省电力有限公司电力科学研究院 | Constant speed control cabinet and its application method applied to portable coal powder sampler |
| CN109459277B (en) * | 2018-11-22 | 2024-04-05 | 国网浙江省电力有限公司电力科学研究院 | Constant-speed control box applied to portable coal dust sampling device and application method of constant-speed control box |
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