CN209280387U - A kind of mounting structure of denitration outlet flue gas gridding method mixing sampling apparatus - Google Patents
A kind of mounting structure of denitration outlet flue gas gridding method mixing sampling apparatus Download PDFInfo
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- CN209280387U CN209280387U CN201821873040.7U CN201821873040U CN209280387U CN 209280387 U CN209280387 U CN 209280387U CN 201821873040 U CN201821873040 U CN 201821873040U CN 209280387 U CN209280387 U CN 209280387U
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Abstract
The utility model discloses a kind of mounting structures of denitration outlet flue gas gridding method mixing sampling apparatus, including denitration outlet flue and air preheater exhaust pass, further include multipoint sampling tube, variable cross-section convergence tube, sampling main pipe and sampling cavity；Multipoint sampling tube has two or more, and is equidistantly mounted in denitration outlet flue cross section；Variable cross-section convergence tube is mounted in denitration outlet flue, and the bottom of all multipoint sampling tubes is connected to variable cross-section convergence tube；Sample main pipe one end connection variable cross-section convergence tube, the other end is connected to air preheater exhaust pass；Cavity setting is sampled in sampling main pipe.The utility model is particularly suitable for the Mixed sampling measurement of denitration outlet NOx and/or ammonia slip concentration, and sample mode meets national proposed standard；Using the pressure difference of denitration outlet flue and air preheater exhaust pass, it can make flue gas sample collected is fast automatic to enter measuring instrumentss, measurement real-time is good, and sampling is reliable and stable, has the significant advantages such as at low cost, maintenance workload is few.
Description
Technical field
The utility model relates to large-scale coal fired power plant denitration exiting flue gas composition measuring techniques, more particularly to monitoring denitration dress
Set NOx and NH in exiting flue gas3The mixing sampling apparatus for concentration of escaping.
Background technique
It currently, is the operation conditions of monitoring coal-fired power station boiler combustion position and downstream denitrification apparatus, in denitrification apparatus
Flue gas on-line continuous analysis system is often installed in outlet, and monitoring parameters include NOx, the escaping of ammonia, O2Concentration etc..However, general measure
Technology is all to take 1~3 measurement point in denitration outlet flue cross section, fans out from point to area and measures denitration outlet flue gas ginseng
Number.In fact, denitrification apparatus capacity is increasing, and exhaust pass sectional dimension is also got over as coal-burning boiler is to enlargement development
Come bigger, traditional 1~3 measurement point concentration cannot represent whole cross section mean concentration, and denitration outlet flue gas is caused to join
Number measurement is inaccurate, influences the operation controlled level of boiler and related subsidiary engine.
GB/T 10184-2015 discloses " division principle of gridding method homalographic and the determination for representing point ", wherein for
Rectangular section takes a little, it is specified that " section to be divided into the rectangle close to square of several homalographics, each small rectangle with latitude and longitude
Cornerwise intersection point is measuring point ".Large-scale coal fired power plant denitration outlet flue is rectangle, the long side length L mono- of rectangular section
As up to 3~15 meters, by regulation measuring point number of rows N=5+ [(L-1.5)/0.5]It is rounded, replenish regulations: " biggish rectangle being cut simultaneously
Face can suitably reduce N value, and total measuring point number in a section is no more than 36 ".
Accordingly, denitration exiting flue gas sample point need to generally be designed as 25~36, be just able to satisfy national standard and recommend to require,
Existing measurement sampling mode needs to upgrade.
Utility model content
In order to realize denitration outlet Gas Parameters it is accurate, in real time, it is reliable and meet national standard and recommend to require measurement,
The utility model provides a kind of mounting structure of denitration outlet flue gas gridding method mixing sampling apparatus.
In order to solve the above technical problems, the technical solution of the utility model is:
A kind of mounting structure of denitration outlet flue gas gridding method mixing sampling apparatus, including denitration outlet flue
It further include multipoint sampling tube, variable cross-section convergence tube, sampling main pipe and sampling cavity with air preheater exhaust pass；Multipoint sampling tube
There are two or more, and be equidistantly mounted in denitration outlet flue cross section, 2 or more are equipped on every multipoint sampling tube
Sampling hole；Variable cross-section convergence tube is mounted in denitration outlet flue, and the bottom of all multipoint sampling tubes is and variable cross-section
Convergence tube connection；Sample main pipe one end connection variable cross-section convergence tube, the other end is connected to air preheater exhaust pass；Sample cavity setting
In sampling main pipe.
The nouns of locality such as the application upper, middle and lower, top, bottom refer both to the relative position of device normal use.It is spatially more
Point probe tube, variable cross-section convergence tube, sampling main pipe are sequentially arranged from top to bottom.
In order to ensure in sampling apparatus, the uniformity of flue gas flow rate, variable cross-section convergence tube has 2~5 different cross section sizes,
Variable cross-section convergence tube is incrementally increased from both ends to middle position sectional dimension, and variable cross-section convergence tube is in both ends symmetrical structure；It takes
Sample main pipe is connected to the middle position of variable cross-section convergence tube.
In order to avoid plugging, it is preferable that multipoint sampling tube and sampling main pipe are vertical or relative level high inclination-angle is arranged, become
Section convergence tube is horizontally disposed, and high inclination-angle refers to that the angle of pipe axis and horizontal plane is greater than 45 °.
Applicant it has been investigated that, above by the flue gas of gridding method multidraw, in horizontal variable cross-section convergence tube,
It can remain higher flow velocity, thus while its is horizontally disposed, but without fouling potential, multipoint sampling tube and sampling main pipe are because perpendicular
It directly or with horizontal plane high inclination-angle arranges also without fouling potential, is able to maintain use steady in a long-term.Above-mentioned multipoint sampling tube and change are cut
Face convergence tube is evenly arranged in high-temperature flue, without heat preservation, high reliablity；Although sampling main pipe and the setting of sampling cavity being filled in denitration
It sets outside exhaust pass, but because shorter along journey, by the i.e. certifiable smoke temperature drop of conventional heat preservation less than 100 DEG C, therefore is not in
The problem of flue gas condensing plugging.
For Thermal generation unit, denitration outlet flue, air preheater exhaust pass are spatially generally in certainly
High and low arrangement, corresponding flue gas static pressure is from high to low.In general, unit is at full capacity under operating condition, denitration outlet flue
It is 1000Pa or more higher than air preheater exhaust pass static pressure.Therefore, denitration outlet flue gas sequentially enters more through multiple sampling holes
Point probe tube, variable cross-section convergence tube and sampling main pipe, by automatic stream air preheater exhaust pass.
It is preferred that being equipped with NOx measuring instrumentss or/and NH on sampling cavity3Escape measuring instrumentss.Sample the structure root of cavity
It is designed according to measuring instrumentss interface requirement.NOx measuring instrumentss or/and NH3Measuring instrumentss of escaping are excellent if sampling probe formula
Choosing, sampling cavity are tubulose, and sampling cavity stretches out obliquely from collateral branch in sampling main pipe, and the pipe axis angle with sampling main pipe
It is 30~60 °；NOx measuring instrumentss or/and NH3Measuring instrumentss of escaping are if local laser correlation, it is preferable that sampling cavity is
Quadrilateral structure samples the two of cavity and is diagonally connected in sampling main pipe, in addition the two diagonal transmittings for installing laser probe respectively
End and receiving end.
Start and stop stage air preheater differential pressure is low in order to prevent, flue-gas temperature is low and sampling apparatus in flue gas flow rate is low causes
Occur dust stratification and condensate liquid (condensate liquid can further result in pernicious stifled ash) in above-mentioned sampling apparatus, samples and be additionally provided with section in main pipe
Flow device, block-resistant protection valve, differential pressure transmitter and temperature point, wherein flow controller is located at the upstream of block-resistant protection valve, all surveys
Amount instrument is located at the upstream of flow controller, and the positive pressure side of differential pressure transmitter is connected in the sampling main pipe of flow controller upstream, and differential pressure becomes
The negative pressure end of device is sent to be connected in the sampling main pipe in block-resistant protection valve downstream.
The effect of above-mentioned flow controller is that pressure difference is exactly generated before and after it, reaches measuring flow by measuring corresponding pressure difference
Purpose, and then can obtain sampling main pipe in flow velocity, it is preferable that sampling main pipe in flue gas flow rate be not less than 5m/s.
When meeting following three decision conditions simultaneously: 1. under block-resistant protection valve completely closed state, differential pressure transmitter
Numerical value is greater than 300Pa, and 2. under block-resistant protection valve fully open state, the flue-gas temperature that temperature point obtains under stable state is greater than 200
DEG C, 3. under block-resistant protection valve fully open state, the numerical value of differential pressure transmitter is greater than 30Pa, just allows at above-mentioned block-resistant protection valve
In normal open position, otherwise closes block-resistant protection valve or warning note operations staff has stifled grey risk.Namely pass through aforementioned structure
The monitoring for realizing static pressure difference, temperature and flow signal meets certain differential pressure condition, temperature condition and flow condition,
Just sampling apparatus is allowed to put into operation, effectively prevents the generation for blocking up ash in sampling apparatus in this way.
It is preferred that temperature point is located at the downstream of all measuring instrumentss in sampling main pipe.The phase of temperature point and other components
Position is not construed as limiting.
It is preferred that the positive pressure side of differential pressure transmitter is connected in the sampling main pipe in flow controller upstream, all measuring instrumentss downstreams.
In order to facilitate control, above-mentioned mounting structure further includes control module, and block-resistant protection valve, differential pressure transmitter and temperature are surveyed
Point is connect with control module respectively.Control module automatically controls block-resistant protection valve according to aforementioned decision condition.The application control
Module selects any existing control module for being able to achieve aforementioned function to be ok, preferably Siemens s7-300 control module.
By adopting the above technical scheme, it is ensured that sampling apparatus does not lead to the problem of stifled ash, but as further preferred, still needs to examine
Consider uncertain stifled grey risk after partial function fails；In order to enhance the maintainability after the stifled ash of above-mentioned sampling apparatus, it is preferable that
The first deashing plug is set on multipoint sampling tube top, the second deashing plug, the first deashing are set at variable cross-section convergence tube both ends
Plug and the second deashing plug all extend to outside denitration outlet flue.Above-mentioned first deashing plug and the second deashing plug are beaten
It opens, can be disclosed into multipoint sampling tube and variable cross-section convergence tube into deashing bar, remove stifled ash.
Flue gas condensing in order to prevent, sampling main pipe and sampling cavity are coated with insulating layer.
It is preferred that multipoint sampling tube there are 3~9,3~9 sampling holes are equidistantly equipped on every multipoint sampling tube.
The representativeness and real-time of smoke sampling in order to balance, and prevent the stifled ash of sampling hole, it is preferable that on multipoint sampling tube
The sampling bore dia of setting is not less than 10mm, and carries on the back air-flow setting.
Air-flow is met in above-mentioned multipoint sampling tube wall surface side, another side back air-flow, and sampling hole setting, can be in back air-flow side
Reduce the dust content of sampling flue gas to the greatest extent.
For the service life for extending above-mentioned sampling apparatus as far as possible, air-flow side is met in multidraw section, is equipped with scuff-resistant coating
Or abrasion-proof structure.
The unmentioned technology of the utility model is referring to the prior art.
A kind of mounting structure of denitration outlet flue gas gridding method mixing sampling apparatus of the utility model, actually multiple spot is mixed
A kind of specific implementation of conjunction sample, the mixing sampling for being particularly suitable for denitration outlet NOx and/or ammonia slip concentration are surveyed
Amount, sample mode meet national proposed standard；Using the pressure difference of denitration outlet flue and air preheater exhaust pass, institute can be made
The flue gas sample of acquisition is fast automatic to enter measuring instrumentss, and measurement real-time is good, and sampling is reliable and stable, has at low cost, maintenance workers
Work amount waits significant advantages less.
Detailed description of the invention
Fig. 1 is the installation space schematic diagram that the utility model denitration outlet flue gas gridding method mixes sampling apparatus.
Fig. 2 is the mounting structure schematic diagram that gridding method mixes sampling apparatus in the utility model embodiment 1.
Fig. 3 is the mounting structure schematic diagram that gridding method mixes sampling apparatus in the utility model embodiment 2.
Fig. 4 is the mounting structure schematic diagram that gridding method mixes sampling apparatus in the utility model embodiment 3.
Fig. 5 is the mounting structure schematic diagram that gridding method mixes sampling apparatus in the utility model embodiment 5.
Fig. 6 is the mounting structure schematic diagram that gridding method mixes sampling apparatus in the utility model embodiment 6.
In figure, 1 is denitration outlet flue, and 2 be air preheater exhaust pass, and 3 be multipoint sampling tube, and 4 converge for variable cross-section
Pipe is closed, 5 sample cavity for sampling main pipe, 6 for NOx measuring instrumentss, and 7 be NH3Measuring instrumentss of escaping sample cavity, and 8 be flow controller,
9 be block-resistant protection valve, and 10 be differential pressure transmitter, and 11 be temperature point, and 12 be sampling probe, and 13 be NOx measuring instrumentss, and 14 are
NH3Escape measuring instrumentss transmitting terminal, 15 be NH3Escape measuring instrumentss receiving end, 16 be the first deashing plug, and 17 be the second deashing
Plug；20 be denitrification apparatus, and 21 be air preheater.
Specific embodiment
The utility model in order to better understand furthers elucidate the content of the utility model below with reference to embodiment, but
The content of the utility model is not limited solely to the following examples.
Embodiment 1
As shown in Fig. 2, a kind of mounting structure of denitration outlet flue gas gridding method mixing sampling apparatus, including denitration dress
Exhaust pass and air preheater exhaust pass are set, further includes multipoint sampling tube, variable cross-section convergence tube, sampling main pipe and NOx measuring instrument
Table samples cavity；Multipoint sampling tube has 5, and is equidistantly vertically installed in denitration outlet flue cross section, every multiple spot
5 sampling holes are equipped on probe tube；Variable cross-section convergence tube has 2 different cross section sizes, from both ends to middle position section ruler
It is very little to incrementally increase, and variable cross-section convergence tube is in both ends symmetrical structure；Variable cross-section convergence tube is mounted in denitration outlet flue
Horizontally disposed, the bottom of all multipoint sampling tubes is connected to variable cross-section convergence tube；Sampling main pipe is arranged in denitration outlet
Outside flue, sampling main pipe one end is connected to the middle position of variable cross-section convergence tube, the other end is connected to air preheater exhaust pass；In sky
Between upper multipoint sampling tube, variable cross-section convergence tube, sampling main pipe be sequentially arranged from top to bottom；Sampling main pipe and sampling cavity coat
There is insulating layer；NOx measuring instrumentss sample cavity setting in sampling main pipe；NOx survey is installed on NOx measuring instrumentss sampling cavity
Instrument is measured, NOx measuring instrumentss are sampling probe formula, and it is tubulose, NOx measuring instrumentss sampling cavity that NOx measuring instrumentss, which sample cavity,
Body stretches out obliquely from collateral branch in sampling main pipe, and is 35 ° with the pipe axis angle of sampling main pipe.
Applicant it has been investigated that, above by the flue gas of gridding method multidraw, in horizontal variable cross-section convergence tube,
It can remain higher flow velocity, thus while its is horizontally disposed, but without fouling potential, multipoint sampling tube and sampling main pipe are because perpendicular
It directly or with horizontal plane high inclination-angle arranges also without fouling potential, is able to maintain use steady in a long-term.Above-mentioned multipoint sampling tube and change are cut
Face convergence tube is evenly arranged in high-temperature flue, without heat preservation, high reliablity；Although sampling main pipe and the setting of sampling cavity being filled in denitration
It sets outside exhaust pass, but because shorter along journey, by the i.e. certifiable smoke temperature drop of conventional heat preservation less than 100 DEG C, therefore is not in
The problem of flue gas condensing plugging.
As shown in Figure 1, denitration outlet flue, air preheater exhaust pass are in space for Thermal generation unit
On generally in the arrangement low from height, corresponding flue gas static pressure is from high to low.In general, unit is at full capacity under operating condition, denitration dress
It is 1000Pa or more higher than air preheater exhaust pass static pressure to set exhaust pass.Therefore, denitration outlet flue gas is through multiple sampling holes
Multipoint sampling tube, variable cross-section convergence tube and sampling main pipe are sequentially entered, by automatic stream air preheater exhaust pass.
Embodiment 2
As shown in figure 3, it is substantially the same manner as Example 1, except that: NH is additionally provided in sampling main pipe3Escape measuring instrument
Table samples cavity, NH3Escape measuring instrumentss sampling cavity body is located at NOx measuring instrumentss sampling cavity downstream, NH3Escape measuring instrumentss
Sampling cavity is quadrilateral structure, samples the two of cavity and is diagonally connected in sampling main pipe, in addition two diagonally installs laser respectively
The transmitting terminal of probe and receiving end.
Embodiment 3
As shown in figure 4, it is substantially the same manner as Example 2, except that: start and stop stage air preheater differential pressure in order to prevent
Low, flue-gas temperature is low and sampling apparatus in flue gas flow rate is low leads to occur dust stratification and condensate liquid (condensation in above-mentioned sampling apparatus
Liquid can further result in pernicious stifled ash), it samples and is additionally provided with flow controller, block-resistant protection valve, differential pressure transmitter and temperature survey in main pipe
Point, wherein flow controller is located at the upstream of block-resistant protection valve, and all measuring instrumentss are located at the upstream of flow controller, differential pressure transmitter
Positive pressure side be connected to flow controller upstream, NH3In the sampling main pipe in measuring instrumentss of escaping sampling cavity downstream, differential pressure transmitter
Negative pressure end is connected in the sampling main pipe in block-resistant protection valve downstream；Temperature point is located at NH in sampling main pipe3Escape measuring instrumentss
Sample the downstream of cavity.
The effect of above-mentioned flow controller is that pressure difference is exactly generated before and after it, reaches measuring flow by measuring corresponding pressure difference
Purpose, and then can obtain sampling main pipe in flow velocity, sample main pipe in flue gas flow rate be not less than 5m/s.When simultaneously meet with
When lower three decision conditions: 1. under block-resistant protection valve completely closed state, the numerical value of differential pressure transmitter is greater than 300Pa, 2. anti-blocking
It protects under valve fully open state, the flue-gas temperature that temperature point obtains under stable state is greater than 200 DEG C, and 3. block-resistant protection valve is opened completely
It opens under state, the numerical value of differential pressure transmitter is greater than 30Pa, and above-mentioned block-resistant protection valve is just allowed to be in normal open position, otherwise closes anti-
There is stifled grey risk in stifled protection valve or warning note operations staff.Namely by aforementioned structure realize static pressure difference, temperature and
The monitoring of flow signal meets certain differential pressure condition, temperature condition and flow condition, just sampling apparatus is allowed to put into operation, this
Sample effectively prevents the generation that ash is blocked up in sampling apparatus.
Embodiment 4
It is substantially the same manner as Example 3, except that: it controlling for convenience, above-mentioned mounting structure further includes control module,
Block-resistant protection valve, differential pressure transmitter and temperature point are connect with control module respectively.Control module is according to aforementioned decision condition
Automatically control block-resistant protection valve.Control module is Siemens s7-300 control module.
Embodiment 5
As shown in figure 5, substantially the same manner as Example 3, except that: in order to enhance after the stifled ash of above-mentioned sampling apparatus can
The first deashing plug is arranged on multipoint sampling tube top in maintainability, and the second deashing plug is arranged at variable cross-section convergence tube both ends, the
One deashing plug and the second deashing plug all extend to outside denitration outlet flue.Above-mentioned first deashing plug and the second deashing
Plug is opened, and can be disclosed into multipoint sampling tube and variable cross-section convergence tube into deashing bar, and stifled ash is removed.
Embodiment 6
As shown in fig. 6, it is substantially the same manner as Example 3, except that: multipoint sampling tube has 7, every multipoint sampling tube
On be equipped with 4 sampling holes；Variable cross-section convergence tube has 3 different cross section sizes, gradually from both ends to middle position sectional dimension
Increase, and variable cross-section convergence tube is in both ends symmetrical structure, sampling main pipe is connected to the middle position of variable cross-section convergence tube.
Embodiment 7
It is substantially the same manner as Example 1, except that: multipoint sampling tube and the sampling equal relative level high inclination-angle cloth of main pipe
It sets, variable cross-section convergence tube is horizontally disposed, and high inclination-angle refers to that the angle of pipe axis and horizontal plane is 75 °.Smoke sampling in order to balance
Representativeness and real-time, and prevent the stifled ash of sampling hole, the sampling bore dia being arranged on multipoint sampling tube not less than 10mm, and
Carry on the back air-flow setting；For the service life for extending above-mentioned sampling apparatus as far as possible, air-flow side is met in multidraw section, is equipped with abrasionproof
Layer or abrasion-proof structure.
Claims (10)
1. a kind of mounting structure of denitration outlet flue gas gridding method mixing sampling apparatus, including denitration outlet flue and
Air preheater exhaust pass, it is characterised in that: further include multipoint sampling tube, variable cross-section convergence tube, sampling main pipe and sampling cavity；It is more
Point probe tube has two or more, and is equidistantly mounted in denitration outlet flue cross section, is all provided on every multipoint sampling tube
There are 2 or more sampling holes；Variable cross-section convergence tube is mounted in denitration outlet flue, and the bottom of all multipoint sampling tubes is equal
It is connected to variable cross-section convergence tube；Sample main pipe one end connection variable cross-section convergence tube, the other end is connected to air preheater exhaust pass；Sampling
Cavity setting is in sampling main pipe.
2. the mounting structure of denitration outlet flue gas gridding method mixing sampling apparatus as described in claim 1, feature exist
In: variable cross-section convergence tube has 2~5 different cross section sizes, is incrementally increased from both ends to middle position sectional dimension, and variable cross-section
Convergence tube is in both ends symmetrical structure；Sampling main pipe is connected to the middle position of variable cross-section convergence tube.
3. the mounting structure of denitration outlet flue gas gridding method mixing sampling apparatus as described in claim 1, feature exist
In: multipoint sampling tube and sampling main pipe are vertical or relative level high inclination-angle arranges that variable cross-section convergence tube is horizontally disposed, inclines greatly
Angle refers to that the angle of pipe axis and horizontal plane is greater than 45 °.
4. the installation knot of denitration outlet flue gas gridding method mixing sampling apparatus as claimed in any one of claims 1-3
Structure, it is characterised in that: be equipped with NOx measuring instrumentss or/and NH on sampling cavity3Escape measuring instrumentss.
5. the mounting structure of denitration outlet flue gas gridding method mixing sampling apparatus as claimed in claim 4, feature exist
In: NOx measuring instrumentss or/and NH3For measuring instrumentss of escaping if sampling probe formula, sampling cavity is tubulose, sample cavity from
Collateral branch stretches out obliquely in sampling main pipe, and is 30~60 ° with the pipe axis angle of sampling main pipe；NOx measuring instrumentss or/and
NH3For measuring instrumentss of escaping if local laser correlation, sampling cavity is quadrilateral structure, samples two diagonal series connection of cavity
In sampling main pipe, the in addition two diagonal transmitting terminals for installing laser probes respectively and receiving end.
6. the installation knot of denitration outlet flue gas gridding method mixing sampling apparatus as claimed in any one of claims 1-3
Structure, it is characterised in that: be additionally provided with flow controller, block-resistant protection valve, differential pressure transmitter and temperature point in sampling main pipe, wherein section
Stream device is located at the upstream of block-resistant protection valve, and all measuring instrumentss are located at the upstream of flow controller, and the positive pressure side of differential pressure transmitter connects
It connects in the sampling main pipe of flow controller upstream, the negative pressure end of differential pressure transmitter is connected to the sampling main pipe in block-resistant protection valve downstream
On.
7. the mounting structure of denitration outlet flue gas gridding method mixing sampling apparatus as claimed in claim 6, feature exist
In: temperature point is located at the downstream of all measuring instrumentss in sampling main pipe；The positive pressure side of differential pressure transmitter is connected on flow controller
It swims, in the sampling main pipe in all measuring instrumentss downstreams.
8. the mounting structure of denitration outlet flue gas gridding method mixing sampling apparatus as claimed in claim 6, feature exist
In: it further include control module, block-resistant protection valve, differential pressure transmitter and temperature point are connect with control module respectively.
9. the installation knot of denitration outlet flue gas gridding method mixing sampling apparatus as claimed in any one of claims 1-3
Structure, it is characterised in that: the first deashing plug is set on multipoint sampling tube top, the second deashing is set at variable cross-section convergence tube both ends
Plug, the first deashing plug and the second deashing plug all extend to outside denitration outlet flue.
10. the installation knot of denitration outlet flue gas gridding method mixing sampling apparatus as claimed in any one of claims 1-3
Structure, it is characterised in that: sampling main pipe and sampling cavity are coated with insulating layer；Multipoint sampling tube has 3~9, and every multiple spot takes
3~9 sampling holes are equidistantly equipped on sample pipe；The sampling bore dia being arranged on multipoint sampling tube is not less than 10mm, and carries on the back air-flow
Setting；Air-flow side is met in multidraw section, is equipped with scuff-resistant coating or abrasion-proof structure.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111141562A (en) * | 2020-02-20 | 2020-05-12 | 南京科远智慧科技集团股份有限公司 | Low-hysteresis sampling analysis system and method for multi-point polling measurement of smoke pollutants |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111141562A (en) * | 2020-02-20 | 2020-05-12 | 南京科远智慧科技集团股份有限公司 | Low-hysteresis sampling analysis system and method for multi-point polling measurement of smoke pollutants |
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