CN209589591U - A kind of multichannel constant speed flue gas sampler - Google Patents
A kind of multichannel constant speed flue gas sampler Download PDFInfo
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- CN209589591U CN209589591U CN201920139034.7U CN201920139034U CN209589591U CN 209589591 U CN209589591 U CN 209589591U CN 201920139034 U CN201920139034 U CN 201920139034U CN 209589591 U CN209589591 U CN 209589591U
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- flue gas
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Abstract
The utility model is a kind of multichannel constant speed flue gas sampler, including sampling tube bank, assistant fixing mechanism, constant speed regulating mechanism and flue gas analyzer；The sampling tube bank is made of the sampling pipe of more equal diameter unequal lengths, and every sampling pipe and sampling mouth junction are arranged in same level；The end of each sampling pipe is respectively connected with a control valve；Heat preservation sleeve is wrapped up in sampling tube bank outsourcing outside flue, is cased with a bearing in the outside of heat preservation barrel end, bearing connects handle, and bearing and assistant fixing mechanism cooperate, so that sampling tube bank can rotate in flue；Sampling pipe length direction is provided with slideway on longest sampling tube wall, Pitot tube is fixed on the slideway, and can be slid back and forth on slideway, and Pitot tube pipe shaft is carved with scale, and Pitot tube head is aligned with the sampling mouth of longest sampling pipe when initial samples.The device can uniformly acquire the flue gas in flue, improve accuracy of measurement.
Description
Technical field
The utility model relates to fire coal boiler fume detection fields, and in particular to a kind of multichannel constant speed flue gas sampling dress
It sets.
Background technique
Flue gas monitoring refers to that the gaseous pollutant to atmosphere pollution source emission, particulate matter carry out concentration and total emission volumn prison
It surveys.Currently, the power supply in China is based on thermal power generation.Contain flue dust, carbon dioxide, titanium dioxide in coal fire discharged flue gas
Sulphur, nitrogen oxides and a small amount of carbon monoxide, flue dust directly influence the environmental quality of atmosphere.Nowadays, it is taken
Mode is mobile multi-point sampling, the disadvantage is that sampling gun needs long enough, therefore one existing when being moved to close to outside
Sampling pipe is divided to be exposed to the atmosphere generation condensation vapor.And sampling mouth is not can guarantee in moving process always situated in same flat
(need keep the stabilization of sampling gun sampling operation personnel's moment when moving, sampling mouth is located at same flat when making mobile on face
Face), cause sampling not have representativeness.Therefore, how to guarantee that the representativeness of flue dust acquisition becomes a great problem of flue gas inspection.
If the utility model of Patent No. 201820318725.9 provides a kind of fixed Multi-channel flue gas sampling gun, by
Sample tube bank, fixed sleeving, pipeline changeover module and flue gas analyzer form, more sampling pipes integrally can be along being auxiliarily fixed casing
Sliding, the structure of this external pulling type will lead to sampling pipe run-off the straight in use, while the exposure of sampling pipe more parts
It is perishable in air；And fixed sleeving cannot rotate, and sampling pipe is inserted directly into when use, it can be mixed into part non-detection gas,
Make the sample inaccuracy of acquisition, sampling gun cannot accomplish isokinetic sampling, sample is caused not have representativeness.
In addition, when being sampled to flue gas should use isokinetic sampling's method, i.e., flue gas enter sampling mouth speed should with adopt
Sampling point flue gas flow rate is equal, and measurement result can be made more accurate.Sample flue gas flow rate and when sampled point flow velocity difference, it can be to adopting
The result of sample measurement brings error.When sample rate is greater than the flue gas flow rate of sampled point, since the inertia of gas molecule is small, hold
Malleable direction, and particulate matter inertia is big, it is not easy to change direction, causes the fraction other than sampling mouth edge to be drawn into and adopt
Sample mouth, and particulate matter therein presses former direction and advances, and does not enter sampling mouth, it is relatively low so as to cause measurement result；Work as sample rate
When less than sampled point flue gas flow rate, situation is exactly the opposite, keeps measurement result higher.
Utility model content
The technical issues of deficiency in view of the above technology, the utility model solves, is to provide a kind of multichannel constant speed flue gas
Sampling apparatus.It is perishable that the device overcomes existing sampling apparatus sampling pipe in smoke collecting, easily tilts, is unable to isokinetic sampling
And cause to sample non-uniform problem, the flue gas in flue can be uniformly acquired, the measurement of pollutant in flue gas can be improved
Accuracy.
The utility model solve the technical problem the technical solution adopted is that: a kind of multichannel constant speed flue gas sampling is provided
Device, including sampling tube bank, assistant fixing mechanism, constant speed regulating mechanism and flue gas analyzer；It is characterized in that,
The sampling tube bank is made of the sampling pipe of more equal diameter unequal lengths, every sampling pipe and sampling mouth junction
It is arranged in same level；The end of each sampling pipe is respectively connected with a control valve；Sampling tube bank outside flue is outer
Package heat preservation sleeve is cased with a bearing in the outside of heat preservation barrel end, and bearing connects handle, bearing and assistant fixing mechanism
Cooperation, so that sampling tube bank can rotate in flue；
The pedestal of the assistant fixing mechanism is fixed with ground, there is circular tube shaped pallet at an upper portion thereof, in pallet front and rear part
Two tube walls up and down be provided with threaded hole, the bolt in threaded hole is connect with a curved shim, the gasket at rear portion and heat preservation
The bearing of barrel end acts on；
Sampling pipe length direction is provided with slideway on longest sampling tube wall, Pitot tube is fixed on the slideway,
And can be slid back and forth on slideway, Pitot tube pipe shaft is carved with scale, and Pitot tube head and longest sampling pipe adopts when initial samples
The alignment of sample mouth.
Compared with prior art, the utility model has the beneficial effects that
1) the sampling tube bank of the utility model is composed of more identical sampling pipes, and when acquiring flue gas, independent acquisition is mutual
It does not influence, sampling length of tube is different, can effectively collect the flue gas of different lateral positions on same section, and then ensure that
Uniform acquisition to flue gas in flue greatly improves the accuracy of detection；
2) the utility model is provided with bearing in sampling tube bank end, can be good at being rotated so that sampling tube bank,
The reason is that sampling tube bank does not work, and sample inlet is adopted back to flow of flue gas direction in arrival when flue is protruded into sampling tube bank
Behind sample position, by 180 ° of rotation of sampling tube bank, thief hatch face flow of flue gas direction is made to start to sample.Purpose is to prevent from sampling
Tube bank is collected into undesirable flue gas when entering flue, the present apparatus can be very good that sampling gun is made to complete rotary course, phase
For in existing actual application, staff needs flow of flue gas in sampling pipe smoke inlet in sampling tube bank and burner hearth
Contrary feeding sampling location starts sampling operation again after then rotating 180 ° rapidly manually, can more convenient staff
Operation, reduce sampling error.
3) for the utility model in calibers such as sampling pipe uses, effect is identical with current mobile multi-point sampling, but its
Without being moved, reduce due to operating bring error；
4) the utility model samples solid in tube bank measurement process in the end setting insulating layer (heat preservation sleeve) of sampling tube bank
It is fixed motionless, the possibility that sampling tube bank is exposed in air is avoided, the service life of sampling tube bank, the weight of integral device are improved
Amount is light, easy to carry；
5) Pitot tube can be shifted one's position by the ground way on sampling pipe in the utility model, by adjusting Pitot tube
Position meet the isokinetic samplings of different sampling pipes, the pressure difference of different location can be measured, gas differential pressure transmitter is acquired
Pressure difference signal is changed into electric signal, and input single-chip microcontroller controls to adjust speed regulation revolution speed and flow, to guarantee sampling pipe air inlet speed
Degree is consistent with velocity of flue gas, meets isokinetic sampling.
Detailed description of the invention
Fig. 1 is the overall structure diagram of the utility model；
Fig. 2 is the utility model sampling tube bank top view；
Fig. 3 is sectional view of the utility model in Section A-A；
1, sampling pipe 1 in figure；2, sampling pipe 2；3, sampling pipe 3；4, Pitot tube；5, handle；6, fixing bolt；7, signal
Line；8, hose is sampled；9, bearing；10, host；11, governor impeller；12, flue gas analyzer；13, fixing-aid device；14, slideway；
15, rubber gasket；16 heat preservation sleeves；17, control valve；18, circular tube shaped pallet.
Specific embodiment
Explain the novel embodiment in detail with example with reference to the accompanying drawing, but not in this, as to the application right
The restriction of claimed range.
(abbreviation device includes sampling tube bank, auxiliary referring to Fig. 1-3) to the utility model multichannel constant speed flue gas sampler
Fixed mechanism, constant speed regulating mechanism and flue gas analyzer；
The sampling tube bank is made of the sampling pipe of more equal diameter unequal lengths, and arrangement mode is according to sampling length of tube
It is successively horizontally arranged from long to short；Every sampling pipe and sampling mouth junction are arranged in same level；The end of each sampling pipe
End is respectively connected with a control valve 17, can constitute according to switch sampling pipe, three sampling pipe equal diameters but length difference is required
One tube bank satisfaction samples different positions in flue；Heat preservation sleeve is wrapped up in sampling tube bank outsourcing outside flue
16, it is cased with a bearing in the outside of heat preservation barrel end, effect is cooperated with assistant fixing mechanism, so that sampling tube bank can
To be rotated in flue；
The pedestal of the assistant fixing mechanism is fixed with ground, there is circular tube shaped pallet 18 at an upper portion thereof, in pallet front and rear part
Two tube walls up and down being divided to are provided with threaded hole, and the bolt in threaded hole is connect with a curved shim, by adjusting bolt position
The height set can control the elastic of sampling gun fixation, be adapted to the sampling gun of different radii, the gasket of front plays auxiliary
The effect of support, the gasket at rear portion and the bearing of heat preservation barrel end act on.
The constant speed regulating mechanism includes Pitot tube, gas differential pressure transmitter, single-chip microcontroller and governor impeller；
Sampling pipe length direction is provided with slideway 14 on longest sampling tube wall, Pitot tube is fixed on the slideway
On, and can be slid back and forth on slideway, Pitot tube pipe shaft is carved with scale, can accurately guarantee Pitot tube head and sampling mouth pair
Together；
The gas differential pressure transmitter can acquire Pitot tube pressure difference and be allowed to be changed into electric signal input single-chip microcontroller；
The single-chip microcontroller has acquisition, calculating, output, feedback control function, can be real according to flue gas flow rate change situation
When adjustment speed regulation revolution speed, flow；
The governor impeller can adjust revolving speed, the flow of governor impeller according to single-chip microcontroller output signal.
In the utility model sampling tube bank in sampling pipe quantity can in practical application according to the requirement of sampled point come
Addition, length are different from the flue gas that can acquire same cross-sectional different location.
The sampling tube bank is identical by more root timber matter, caliber etc., is not uniquely both the different sampling pipe group of tube length
It closes, when acquiring flue gas, independent acquisition is independent of each other, and sampling length of tube is different, can effectively collect sustained height section
Flue gas particle at upper different location, and then ensure that the uniform acquisition to flue gas in flue, mention the accuracy of detection significantly
It is high.
The working principle of the utility model sampling apparatus is: sampling tube bank be inserted perpendicularly into flue, sampling tube bank with
Flow of flue gas direction is vertically arranged, and when being initially inserted into sampling tube bank all sampling pipes back to flue gas flow rate direction, installation
It after good, is rotated by handle 5 and bearing, and then makes sampling tube bank face flue gas flow rate direction.The opposite position of more sampling tube banks
It is set to user to have determined early period, Pitot tube pipe shaft is carved with Measurement scales, by outside pull Pitot tube, observes Pitot tube
The distance pulled out can determine which sampling pipe of current location face, the control valve for controlling corresponding sampling pipe immediately open or
It closes, the multi-point sampling to different location point on the same straight line of sustained height in flue is completed, due to sampling pipe itself caliber
The location point for influencing multi-point sampling has certain deviation, but still is approximately considered on the same line.
Sampling tube bank is fixed after being mounted in flue, no longer outer in measurement process to draw, and passes through outer La Pituo
Pipe completes multi-point sampling,
When just starting sampling, Pitot tube head is aligned with longest sampling pipe sampling mouth, when extracting Pitot tube out, passes through skin support
The scale of pipe pipe shaft is aligned Pitot tube with sampling mouth, example Pitot tube at the beginning at the sampling mouth position of longest sampling pipe 1,
When intermediate samples pipe 2 to be made is sampled, Pitot tube is extracted 0.5 meter out and can be aligned with the sampling mouth of sampling pipe 2；It is being switched to
Intermediate samples pipe 2 when, can first pass through handle rotary shaft and hold makes it back to blowback, empty the flue gas in sampling pipe to be sampled,
Then face is sampled again, further increases sampling precision.
The relative length of multiple sampling pipes is corresponding with the position of sampled point in flue to be acquired, the position of sampled point in flue
It sets, user can carry out experimental study to it early period, determine that the sampled point of what position is more representative, to representative
Position is sampled with sampling pipe.
Embodiment 1
The present embodiment multichannel constant speed flue gas sampler is as shown in Figure 1, include three samplings that flue cavity is arranged in
Pipe, is longest sampling pipe 1, intermediate samples pipe 2, most short sampling pipe 3 respectively, sampling pipe long 1.8m, 1.3m and 0.8m respectively, three
It is divided into 0.5m between sampling tube inlet, the slideway with Pitot tube cooperation is provided on the outer wall of longest sampling pipe 1, Pitot tube is long
1.8m is carved with obvious scale outside Pitot tube, and when Pitot tube extracts 0.5 meter out outward, Pitot tube front end is from longest sampling pipe 1
Inlet transforms are to 2 entrance of intermediate samples pipe.Pitot tube is connected with gas differential pressure transmitter, measures the pressure difference of flue gas, passes through signal
Line gives gas differential pressure transmitter, its pressure difference signal is made to be changed into electric signal, inputs single-chip microcontroller, and single-chip microcontroller is according to the flue gas of input
The signal of flow velocity transformation, adjustment speed regulation in real time revolution speed, flow.
The end of 3 sampling pipes cooperates with a four way valve, by adjusting the switch of four way valve, can complete three
The independent switching of sampling pipe.
14 section of slideway that longest samples pipe outer wall is " convex " word, and Pitot tube outer wall and a T font plate weld, and makes skin support
Pipe can be slided in 1 outer wall of longest sampling pipe, to measure the pressure difference of different sampling tube inlet positions.
The sampling tube bank tail portion is provided with 30cm heat preservation sleeve 16, matches in heat preservation barrel end with a bearing
It closes, the bearing radius is heat preservation sleeve outer diameter, and in the sampling preparation stage, sampling tube bank is placed on assistant fixing mechanism 13
On circular tube shaped pallet, bearing 9 is fixed by the rubber gasket 15 of circular tube shaped pallet end, and the front end for keeping the temperature sleeve is fixed by bolt 6.
The pedestal of assistant fixing mechanism is disk, is connect by bolt with ground, disc centre is support rod, in support rod
There is circular tube shaped pallet on top.
The course of work of the present embodiment sampling apparatus is: by sampling tube inlet back to (back to referring to sampling pipe smoke inlet
It is contrary with flow of flue gas in burner hearth, i.e., at this time sampling pipe bending part front view be opening upwards parabola) flue gas stream
Flue is protruded into dynamic direction, fixed after 180 ° of rotation, and initial Pitot tube is located at 1 inlet of longest sampling pipe, open four way valve and
The corresponding switch of longest sampling pipe 1 controls governor impeller by single-chip microcontroller, makes the intake velocity and velocity of flue gas one of present sample pipe
Cause can carry out constant speed to longest sampling pipe 1, and (constant speed refers to that flue gas flow rate is identical with the flow velocity in sampling pipe in flue.Flue gas stream
Speed is that the flow velocity by boiler implosion, in sampling pipe is controlled by constant speed speed adjusting gear) sampling；After the sampling time, four are closed
Pitot tube is extracted out 0.5m outward and is allowed to corresponding with 2 entry position of intermediate samples pipe by port valve door, opens four way valve and centre is adopted
The corresponding switch of sample pipe 2 completes transition of the longest sampling pipe 1 to intermediate samples pipe 2.
The foregoing is merely preferred embodiment of the present application, are not intended to limit this application, for the skill of this field
For art personnel, various changes and changes are possible in this application.Within the spirit and principles of this application, made any to repair
Change, equivalent replacement, improvement etc., should be included within the scope of protection of this application.
Claims (4)
1. a kind of multichannel constant speed flue gas sampler, including sampling tube bank, assistant fixing mechanism, constant speed regulating mechanism and flue gas
Analyzer；It is characterized in that,
The sampling tube bank is made of the sampling pipe of more equal diameter unequal lengths, every sampling pipe and the setting of sampling mouth junction
In same level；The end of each sampling pipe is respectively connected with a control valve；Sampling tube bank outsourcing outside flue is wrapped up in
Sleeve is kept the temperature, is cased with a bearing in the outside of heat preservation barrel end, bearing connects handle, and bearing is matched with assistant fixing mechanism
It closes, so that sampling tube bank can rotate in flue；
Sampling pipe length direction is provided with slideway on longest sampling tube wall, Pitot tube is fixed on the slideway, and energy
It is slid back and forth on slideway, Pitot tube pipe shaft is carved with scale, the sampling mouth on Pitot tube head and longest sampling pipe when initial samples
Alignment.
2. multichannel constant speed flue gas sampler according to claim 1, which is characterized in that more sampling pipes are according to sampling
Length of tube is successively horizontally arranged from long to short.
3. multichannel constant speed flue gas sampler according to claim 1, which is characterized in that the length difference of neighbouring sample pipe
For 0.5m.
4. multichannel constant speed flue gas sampler according to claim 1, which is characterized in that the constant speed regulating mechanism packet
Include Pitot tube, gas differential pressure transmitter, single-chip microcontroller and governor impeller.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920139034.7U CN209589591U (en) | 2019-01-28 | 2019-01-28 | A kind of multichannel constant speed flue gas sampler |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920139034.7U CN209589591U (en) | 2019-01-28 | 2019-01-28 | A kind of multichannel constant speed flue gas sampler |
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| Publication Number | Publication Date |
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| CN209589591U true CN209589591U (en) | 2019-11-05 |
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|---|---|---|---|
| CN201920139034.7U Expired - Fee Related CN209589591U (en) | 2019-01-28 | 2019-01-28 | A kind of multichannel constant speed flue gas sampler |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109540612A (en) * | 2019-01-28 | 2019-03-29 | 河北工业大学 | A kind of multichannel constant speed flue gas sampler |
| GB2614927A (en) * | 2022-01-20 | 2023-07-26 | Endet Ltd | Combined pitot tube and sampling device |
-
2019
- 2019-01-28 CN CN201920139034.7U patent/CN209589591U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109540612A (en) * | 2019-01-28 | 2019-03-29 | 河北工业大学 | A kind of multichannel constant speed flue gas sampler |
| CN109540612B (en) * | 2019-01-28 | 2024-03-29 | 河北工业大学 | Multichannel constant-speed flue gas sampling device |
| GB2614927A (en) * | 2022-01-20 | 2023-07-26 | Endet Ltd | Combined pitot tube and sampling device |
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| Date | Code | Title | Description |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20191105 Termination date: 20220128 |
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| CF01 | Termination of patent right due to non-payment of annual fee |