CN208579964U - A kind of big section flue SCR-CEMS flue gas multiple spot mixed in equal amounts second level injection quick sampling device - Google Patents
A kind of big section flue SCR-CEMS flue gas multiple spot mixed in equal amounts second level injection quick sampling device Download PDFInfo
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- CN208579964U CN208579964U CN201820962533.1U CN201820962533U CN208579964U CN 208579964 U CN208579964 U CN 208579964U CN 201820962533 U CN201820962533 U CN 201820962533U CN 208579964 U CN208579964 U CN 208579964U
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Abstract
The utility model discloses a kind of big section flue SCR-CEMS flue gas multiple spot mixed in equal amounts second level injection quick sampling devices, by being formed under the flue gas static pressure difference at import first order sample lines and outlet first order sample lines both ends from injection；Branch pipe is sampled by setting import flue gas sampling branch pipe and exiting flue gas, flue gas is flowed to mixing in import first order sample lines and outlet first order sample lines, the fast automatic inflow air preheater exhaust pass under flue gas static pressure difference ejector action respectively；Import first order sample lines and the outlet equal approach SCR-CEMS instrument cubicle of first order sample lines, fume sample is extracted from import first order sample lines and outlet first order sample lines respectively, it is respectively delivered to import CEMS analyzer and outlet CEMS analyzer after pretreatment, forms second level flue gas sampling pipeline.The utility model can be improved the flue gas sampling representativeness of CEMS analyzer and shorten the measurement delay time, improves the unit load followability that SCR spray ammonia total amount is adjusted, reduces the fluctuating range of NOx emission concentration.
Description
Technical field
The utility model relates to SCR gas denitrifying technology field more particularly to a kind of big section flue SCR-CEMS flue gases
Multiple spot mixed in equal amounts second level injection quick sampling device.
Background technique
Currently, domestic coal unit generallys use SCR equipment for denitrifying flue gas and reaches minimum discharge limit value to control NOx
50mg/m3.Usually 1 set of online CEMS analyzer measurement NO/O is respectively arranged in the inlet and outlet flue of SCR reactor2Concentration,
Using feedforward (load, inlet NOx concentration and outlet NOx preset value calculation ammonia spraying amount)+feedback (actual measurement exit NOx concentration amendment
Ammonia spraying amount) method automatically adjust ammonia spraying amount on demand.But in actual moving process, there is a problem of two it is related to measurement and
Phenomenon:
1) representativeness of CEMS sampled measurements is low
SCR inlet and outlet flue cross section product is all bigger, and inlet size is about 2-3m × 10-25m, and outlet size is about 3-6m
×10-25m.Import and export the NOx/O in flue cross section flue gas2Concentration distribution is uneven, the distribution relative standard of inlet NOx concentration
Deviation about 3-8% exports about 20-50%.The uneven distribution of biggish flue cross section and NOx concentration reduces single-point sampling
And the representativeness of CEMS assay value.Part of generating units CEMS uses 3 flue gas samplings or Distributed Multi flue gas sampling, but the former
Sampled point is very few, the latter does not ensure that each point equivalent samples, and affects the raising of sampling representativeness.
2) time of CEMS measurement delay combustion conditions is long
Online CEMS instrument cubicle is usually placed in SCR reactor outlet platform, CEMS flue gas sampling pipeline length, velocity in pipes
It is low, the sampling time long variation for causing detected value seriously to lag behind combustion conditions.The especially flue gas sampling pipeline of SCR import CEMS
Up to 50-70m, the measurement delay time is up to 2-3min.During unit lifting load or Coal pulverizer, SCR import flue gas
In practical NOx concentration with combustion conditions fluctuating range be about ± 10-50mg/min.When unit combustion conditions quickly change,
Because CEMS measured value lags, the control lag of SCR ammonia spraying amount can be made, cause denitration exit NOx concentration cyclic fluctuation, fluctuate width
Degree is more than ± 20mg/m3。
It easily causes NOx emission exceeded at the wave crest of the SCR exit NOx concentration curve of cyclical fluctuations, the escaping of ammonia is easily caused at trough
It is excessive.Realize that NOx emission concentration is less than 50mg/m for all the period of time3, SCR can only be set and export NOx controlling value to 30mg/m3Hereinafter,
This will aggravation air preheater ammonium hydrogen sulfate blocking.As shown in table 1, the NOx emission concentration of wave crest operating condition has reached emission limit, and wave
The NOx emission concentration of paddy operating condition is very low, ammonia slip concentration 6 μ L/L higher than steady working condition.
1 SCR of table exports influence of the NOx fluctuating range to the escaping of ammonia
| Project | Unit | Design stability operating condition | Wave crest operating condition | Trough operating condition |
| Inlet NOx concentration | mg/m3 | 300 | 320 | 280 |
| Exit NOx concentration | mg/m3 | 30 | 50 | 10 |
| Denitration efficiency | % | 90 | 84 | 96 |
| Ammonia slip concentration | μL/L | 3 | 1.9 | 9 |
There are two types of the unit load followability that SCR spray ammonia can be improved in method at present: 1) according to SCR inlet NOx concentration and machine
The corresponding relationship of group combustion conditions variation, increases preset value in spray ammonia control logic, for the variation of combustion conditions, increases in advance
Add or reduce ammonia spraying amount.This method can control the fluctuating range of exit NOx concentration to be less than ± 10mg/m3, but work as burner
When the corresponding relationship of condition and NOx vary widely, preset value need to be reset.2) shorten flue gas sampling point and CEMS instrument cubicle
Distance, as far as possible within the reduction measurement delay time to 2min, but SCR inlet NOx concentration is fluctuated with combustion conditions acute
The NOx concentration fluctuating range of strong unit, the outlet SCR is still larger.
Utility model content
In view of above-mentioned defect existing in the prior art, the purpose of this utility model is to propose a kind of big section flue SCR-
CEMS flue gas multiple spot mixed in equal amounts second level injection quick sampling device improves the measurement representativeness of CEMS analyzer and shortens measurement
Lag time.
To achieve the goals above, the utility model adopts the technical scheme that
A kind of big section flue SCR-CEMS flue gas multiple spot mixed in equal amounts second level injection quick sampling device, including successively connect
The boiler connect, SCR reactor and air preheater are equipped with SCR inlet flue duct, the SCR between the boiler and the SCR reactor
SCR exhaust pass is equipped between reactor and the air preheater, the outlet of the air preheater is equipped with air preheater exhaust pass；
AIG ammonia-spraying grid, the SCR inlet flue duct of AIG ammonia-spraying grid upstream are equipped in the SCR inlet flue duct
Import flue gas sampling branch pipe and exiting flue gas are respectively arranged in furnace wide direction with the large scale section of the SCR exhaust pass
Sample branch pipe；
The import flue gas sampling branch pipe is connected to the import flue gas sampling collecting pipe being located at outside the SCR inlet flue duct,
Import first order sample lines are equipped between the import flue gas sampling collecting pipe and the air preheater exhaust pass；
The exiting flue gas sampling branch pipe is connected to the exiting flue gas sampling collecting pipe being located at outside the SCR exhaust pass,
Outlet first order sample lines are equipped between the exiting flue gas sampling collecting pipe and the air preheater exhaust pass；
The import first order sample lines and the outlet first order sample lines pass through the import second level respectively and sample
Between pipeline connects CEMS analysis meter with outlet second level sample lines.
Further, the AIG ammonia-spraying grid sprays ammonia flow control valve by SCR and is connected to spray ammonia main pipe.
Further, the import flue gas sampling branch pipe and exiting flue gas sampling branch pipe are difference long by 6-10 root respectively
The flute type carbon steel branch pipe composition of degree, different-diameter.
Further, the import flue gas sampling branch pipe and exiting flue gas sampling branch pipe are respectively perpendicular to incoming flow flue gas
Arrangement, windward side is respectively arranged with abrasionproof angle iron.
Further, the import first order sample lines and the outlet first order sample lines are respectively that length is
20m-70m, the round carbon steel main pipe that diameter is 100mm-200mm.
Further, the import first order sample lines and the outlet first order sample lines are laid with guarantor outside respectively
Wen Mian.
Further, import second level sample lines and outlet second level sample lines are respectively length 5m-
15m, the CEMS sampling pipe with heat tracing.
The big section flue SCR-CEMS flue gas multiple spot mixed in equal amounts second level injection quick sampling device of any one of the above
The method of sampling, comprising the following steps:
1) under unit senior middle school underload, the air preheater exhaust pass and the SCR inlet flue duct and institute are measured respectively
The flue gas static pressure difference between SCR exhaust pass is stated, under the ejector action of flue gas static pressure difference, sampling mixed flue gas flows into air preheater
Exhaust pass forms first order flue gas sampling pipeline, and inner tube smoke flow velocity is 10m/s-20m/s, the import first order sampling
Gas residence time in pipeline is less than 5s, and the gas residence time in the outlet first order sample lines is less than 2s；According to
Inner tube smoke flow velocity and length of pipe, design the import first order sample lines and it is described outlet first order sample lines it is straight
Diameter；The thickness of heat-preservation cotton is designed according to the flue-gas temperature of sampled point, it is ensured that the import first order sample lines and the outlet
Temperature in first order sample lines is not less than 200 DEG C；
2) under unit senior middle school underload, respectively in the section net of the SCR inlet flue duct and the SCR exhaust pass
Lattice method measures NOx concentration distribution, according to the NOx average value in section and the NOx average value equal principle of point is represented, described in selection
The sampling in multiple spot flue gas sampling section represents the position of point in SCR inlet flue duct and the SCR exhaust pass, to ensure sampled point
Representativeness；
3) according to each branch pipe flue gas flow equal principle, using CFD method for numerical simulation, multiple spot flue gas sampling section
On the import flue gas sampling branch pipe and the exiting flue gas sampling branch pipe diameter be gradually reduced from main pipe is distal-to-proximal,
Ensure that each sampling represents the flue gas sampling mixed in equal amounts of point, to improve flue gas sampling representativeness；
4) import second level sample lines and outlet second level sample lines are respectively from the import first order
Fume sample is extracted in sample lines and the outlet first order sample lines, after the preprocessed device dehumidifying of sampling flue gas, conveying
To the interior test of CEMS analysis meter, the second level sampling analysis time is less than 15s；
5) lag time based on secondary smoke sampling test analysis improves the spray ammonia of feedforward+feedback SCR spray ammonia control
Adjust followability.The time that the test of SCR import flue gas sampling lags behind combustion conditions variation is less than 20s, considers ammonia in spray ammonia
Residence time in AIG main pipe and branch pipe is less than 3s, and the gas residence time between AIG ammonia-spraying grid and top layer catalyst is less than
2s, the gas residence time in reactor are less than 4s, and SCR exiting flue gas samples the testing time and is less than 17s, lag behind spray ammonia when
Between be less than 26s.Ammonia control mode is sprayed in conjunction with conventional feedforward+feedback, in the detection that CEMS in-line analyzer has been greatly shortened
On the basis of lag time, the response followability between the adjusting of SCR ammonia spraying amount and the fluctuation of unit combustion conditions, stability contorting are improved
The fluctuating range of SCR reactor outlet NOx concentration is less than ± 10mg/m3。
Further, the flue gas static pressure difference is 1.5kPa-2.5kPa.
Further, the flue gas flow rate is 15m/s.
A kind of protrusion effect of the utility model are as follows: big section flue SCR-CEMS flue gas multiple spot equivalent of the utility model
Second level injection quick sampling device is mixed, the cigarette in import first order sample lines and outlet first order sample lines both ends is passed through
It is formed under gas static pressure difference from injection；Branch pipe is sampled by setting import flue gas sampling branch pipe and exiting flue gas, flue gas converges respectively
It is mixed in import first order sample lines and outlet first order sample lines, it is fast automatic under flue gas static pressure difference ejector action
Flow into air preheater exhaust pass；Import first order sample lines and the outlet equal approach SCR-CEMS instrument of first order sample lines
Between, fume sample is extracted from import first order sample lines and outlet first order sample lines respectively, it is defeated respectively after pretreatment
It is sent to import CEMS analyzer and outlet CEMS analyzer, forms second level flue gas sampling pipeline.The utility model can be improved
The flue gas sampling representativeness of CEMS analyzer and shorten the measurement delay time, improve unit load that SCR spray ammonia total amount is adjusted with
It is casual, reduce the fluctuating range of NOx emission concentration.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of the utility model embodiment；
In figure: 1 is boiler, and 2 be SCR reactor, and 3 be air preheater, and 4 be SCR inlet flue duct, and 5 be import flue gas sampling branch
Pipe, 6 be import flue gas sampling collecting pipe, and 7 spray ammonia flow control valve for SCR, and 8 be spray ammonia main pipe, and 9 be AIG ammonia-spraying grid, and 10 are
SCR exhaust pass, 11 be air preheater exhaust pass, 12 for exiting flue gas sample branch pipe, 13 for exiting flue gas sample collecting pipe, 14
It is outlet first order sample lines for import first order sample lines, 15,16 between CEMS analysis meter, and 17 be the import second level
Sample lines, 18 be outlet second level sample lines.
Specific embodiment
The following will be combined with the drawings in the embodiments of the present invention, carries out the technical scheme in the embodiment of the utility model
Clearly and completely describe, it is clear that the described embodiments are only a part of the embodiments of the utility model, rather than whole
Embodiment.
Embodiment
As shown in Figure 1, a kind of big section flue SCR-CEMS flue gas multiple spot mixed in equal amounts second level injection of the present embodiment is fast
Fast sampling apparatus, including sequentially connected boiler 1, SCR reactor 2 and air preheater 3, are equipped between boiler 1 and SCR reactor 2
SCR inlet flue duct 4, is equipped with SCR exhaust pass 10 between SCR reactor 2 and air preheater 3, the outlet of air preheater 3 is equipped with air preheater
Exhaust pass 11；
AIG ammonia-spraying grid 9 is equipped in SCR inlet flue duct 4, the SCR inlet flue duct 4 and SCR of 9 upstream of AIG ammonia-spraying grid go out
The large scale section of mouth flue 10 is respectively arranged with import flue gas sampling branch pipe 5 and exiting flue gas sampling branch pipe in furnace wide direction
12；
Import flue gas sampling branch pipe 5 is connected to the import flue gas sampling collecting pipe 6 being located at outside SCR inlet flue duct 4, import cigarette
Gas, which samples, is equipped with import first order sample lines 14 between collecting pipe 6 and air preheater exhaust pass 11；
Exiting flue gas samples the exiting flue gas sampling collecting pipe 13 that branch pipe is located at outside SCR exhaust pass 10 with 12 and is connected to, out
Outlet first order sample lines 15 are equipped between mouth flue gas sampling collecting pipe 13 and air preheater exhaust pass 11；
Import first order sample lines 14 and outlet first order sample lines 15 pass through import second level sample lines respectively
17 and outlet second level sample lines 18 connect 16 between CEMS analysis meter.
Wherein, AIG ammonia-spraying grid 9 sprays ammonia flow control valve 7 by SCR and is connected to spray ammonia main pipe 8.
Import flue gas sampling branch pipe 5 and exiting flue gas sampling branch pipe 12 are respectively by 6-10 root different length, different-diameter
Flute type carbon steel branch pipe is constituted.
Import flue gas sampling branch pipe 5 and exiting flue gas sampling branch pipe 12 are respectively perpendicular to incoming flow flue gas arrangement, windward side
It is respectively arranged with abrasionproof angle iron.
Respectively length is 20m-70m, diameter is for import first order sample lines 14 and outlet first order sample lines 15
The round carbon steel main pipe of 100mm-200mm.
Import first order sample lines 14 and outlet first order sample lines 15 are outer respectively to be laid with heat-preservation cotton.
Import second level sample lines 17 and outlet second level sample lines 18 are respectively length 5m-15m, with heat tracing
CEMS sampling pipe.
The big section flue SCR-CEMS flue gas multiple spot mixed in equal amounts second level injection quick sampling device of any one of the above
The method of sampling, comprising the following steps:
1) under unit senior middle school underload, air preheater exhaust pass 11 and SCR inlet flue duct 4 are measured respectively and SCR is exported
Flue gas static pressure difference between flue 10, under the ejector action of flue gas static pressure difference, sampling mixed flue gas flows into air preheater and exports cigarette
Road 11 forms first order flue gas sampling pipeline, and inner tube smoke flow velocity is 10m/s-20m/s, in import first order sample lines 14
Gas residence time be less than 5s, export first order sample lines 15 in gas residence time be less than 2s；According to inner tube smoke
Flow velocity and length of pipe, design import first order sample lines 14 and the diameter for exporting first order sample lines 15；According to sampling
The thickness of the flue-gas temperature design heat-preservation cotton of point, it is ensured that in import first order sample lines 14 and outlet first order sample lines 15
Temperature be not less than 200 DEG C；
2) under unit senior middle school underload, respectively in the section gridding method of SCR inlet flue duct 4 and SCR exhaust pass 10
NOx concentration distribution is measured, according to the NOx average value equal principle of the NOx average value in section and representative point, selects SCR import cigarette
The sampling in multiple spot flue gas sampling section represents the position of point in road 4 and SCR exhaust pass 10, to ensure the representativeness of sampled point；
3) according to each branch pipe flue gas flow equal principle, using CFD method for numerical simulation, on multiple spot flue gas sampling section
The diameter of import flue gas sampling branch pipe 5 and exiting flue gas sampling branch pipe 12 is gradually reduced from main pipe is distal-to-proximal, it is ensured that is respectively adopted
Sample represents the flue gas sampling mixed in equal amounts of point, to improve flue gas sampling representativeness；
4) import second level sample lines 17 and outlet second level sample lines 18 are respectively from import first order sample lines
14 are transported to CEMS points after the preprocessed device of sampling flue gas dehumidifies with fume sample is extracted in outlet first order sample lines 15
Test in instrument cubicle 16 is analysed, the second level sampling analysis time is less than 15s；
5) lag time based on secondary smoke sampling test analysis improves feedforward+feedback SCR spray ammonia control logic.
The time that the test of SCR import flue gas sampling lags behind combustion conditions variation is less than 20s, considers ammonia in spray ammonia AIG main pipe and branch
Residence time in pipe is less than 3s, and the gas residence time between AIG ammonia-spraying grid and top layer catalyst is less than 2s, in reactor
Gas residence time be less than 4s, SCR exiting flue gas sample the testing time be less than 17s, lag behind spray ammonia time be less than 26s.
Ammonia control mode is sprayed in conjunction with conventional feedforward+feedback, in the detection lag time base that CEMS in-line analyzer has been greatly shortened
On plinth, the response followability between the adjusting of SCR ammonia spraying amount and the fluctuation of unit combustion conditions is improved, stability contorting SCR reactor goes out
The fluctuating range of mouth NOx concentration is less than ± 10mg/m3。
Wherein, it is preferred that flue gas static pressure difference is 1.5kPa-2.5kPa.Flue gas flow rate is 15m/s.
Using the present embodiment, certain 1000MW unit takes opposed firing combustion system, if 2 SCR reactors, every
SCR Reactor inlet flue cross section is 17.49m × 4.6m, and exhaust pass section is 17.49m × 7.1m.Unit senior middle school underload
Under inlet flue duct section NOx mean concentration about 700-1000mg/m3, it is distributed relative standard deviation about 3-6%, outlet NOx is flat
Equal concentration about 20-40mg/m3, distribution deviation about 40-80%.SCR reactor inlet and outlet flue cross section respectively sets 1 single-point sampling
CEMS analyzer, import sampling line are about 70m, and outlet is about 35m.Unit load change rate about 10MW/min, SCR import
The amplitude of variation per minute about 0-50mg/m of NOx concentration3.When low and measurement delay representative due to the flue gas sampling of CEMS instrument
Between be about 60s, it is very unstable that SCR sprays ammonia, and it is bigger than normal to often result in ammonia slip concentration, deteriorates the blocking of air preheater ammonium hydrogen sulfate, cigarette side
Resistance about 2-4kPa.
For the flue gas sampling measurement and operation status of unit SCR import CEMS instrument, flue gas multiple spot equivalent has been carried out
Mix the design and application of second level injection quick sampling device:
1) SCR under on-the-spot test unit senior middle school underload imports and exports flue cross section NOx distribution, flue-gas temperature, inlet and outlet
The parameters such as the flue gas pressure drop between flue and air preheater outlet, determine Basic Design flue gas boundary condition；
2) flue gas sampling main pipe is designed as the carbon steel pipe of diameter 100mm, is applied with the heat preservation rock with rear 150mm.SCR disengaging
Flue gas sampling connection main pipe length between mouth flue and air preheater exhaust pass is respectively 80m and 45m, and SCR imports and exports flue
Main pipe length with the second level CEMS sampled point is respectively 55m and 20m, and velocity of flue gas is opened up at the 15m of this downstream and temperature is surveyed
Metering-orifice；
3) flue gas that SCR import horizontal flue is arranged vertically 83 kinds of diameters (80mm, 50mm, 35mm) in the width direction is adopted
Sample branch pipe, length are divided into 4 kinds of 4000mm, 3000mm, 2000mm, 1000mm etc., the end that every branch pipe is connect with flue gas
10 10mm apertures are respectively set within the scope of 1000mm；
4) flue gas of SCR exit normal flue horizontally disposed 83 kinds of diameters (80mm, 50mm, 35mm) in the width direction is adopted
Sample branch pipe, is limited by installation space, only in 1/3 depth flue arrangement sampling branch pipe, length be divided into 2500mm, 2000mm,
4 kinds of 1500mm, 1000mm etc., 5 10mm apertures are respectively set within the scope of the end 500mm that every branch pipe is connect with flue gas；
5) second level flue gas sampling length of tube between the CEMS smoke sampling point and analyzer in inlet and outlet sampling main pipe
Respectively 15m, 15m.
After system is installed, under unit senior middle school underload, to flue gas multiple spot mixed in equal amounts second level injection quick sampling
The performance characteristics of device carry out on-the-spot test assessment, and specific test result is summarized in table 2:
1) on the basis of the section NOx concentration average value of grid survey, sampling main pipe is assessed using relative deviation method and is surveyed
NOx concentration, the representativeness of unit DCS show value of amount, relative deviation show that measuring point representativeness is better closer to zero.Test
The results show that under senior middle school's underload: the NOx concentration relative standard deviation that SCR import samples main pipe gets over -0.6%~1.2%, DCS
The relative deviation about -6.1%~-2.5% of show value；The NOx concentration relative standard deviation of the outlet SCR sampling main pipe gets over -3.9%
The relative deviation of~18.2%, DCS show value about 101.8%~-149.5%, the relative deviation of DCS show value is about at chimney
7.5%~-16.1%；Multiple spot flue gas mixed in equal amounts samples' representativeness is higher, export 1/3 flue sampling mixed effect with
It is close through the mixed effect at long-distance mixing after funnel；
2) SCR reactor inlet and outlet sample the flue gas flow rate in main pipe about 14.1~17.2m/s, 14.6~17.8m/ respectively
S, the residence time to second level flue gas sampling point are respectively 3.1~3.9s, 1.1~1.4s.When sampling 13s in conjunction with the second level
Between, import flue gas sampling lag time about 16~17s exports lag time about 14s；
3) under unit senior middle school underload, about 350~380 DEG C of flue gas initial temperature is sampled, is adopted in the first order and the second level
Sample interface tube position, about 250~255 DEG C respectively of flue-gas temperature in import flue gas sampling pipe, the cigarette in exiting flue gas sampling pipe
About 280~290 DEG C respectively of temperature degree, it is ensured that the first order flue gas sampling mother inner tube smoke ammonium hydrogen sulfate that do not condense and do not occur is viscous
It is attached.
The test result of 2 flue gas multiple spot mixed in equal amounts second level injection quick sampling device of table
The preferable specific embodiment of the above, only the utility model, but the protection scope of the utility model is not
It is confined to this, anyone skilled in the art is within the technical scope disclosed by the utility model, practical according to this
Novel technical solution and its utility model design are subject to equivalent substitution or change, should all cover the protection model in the utility model
Within enclosing.
Claims (6)
1. a kind of big section flue SCR-CEMS flue gas multiple spot mixed in equal amounts second level injection quick sampling device, including be sequentially connected
Boiler, SCR reactor and air preheater, it is characterised in that: SCR import cigarette is equipped between the boiler and the SCR reactor
Road is equipped with SCR exhaust pass between the SCR reactor and the air preheater, the outlet of the air preheater goes out equipped with air preheater
Mouth flue；
AIG ammonia-spraying grid, the SCR inlet flue duct of AIG ammonia-spraying grid upstream and institute are equipped in the SCR inlet flue duct
The large scale section for stating SCR exhaust pass is respectively arranged with import flue gas sampling branch pipe and exiting flue gas sampling in furnace wide direction
Branch pipe；
The import flue gas sampling branch pipe is connected to the import flue gas sampling collecting pipe being located at outside the SCR inlet flue duct, described
Import first order sample lines are equipped between import flue gas sampling collecting pipe and the air preheater exhaust pass；
The exiting flue gas sampling branch pipe is connected to the exiting flue gas sampling collecting pipe being located at outside the SCR exhaust pass, described
Exiting flue gas, which samples, is equipped with outlet first order sample lines between collecting pipe and the air preheater exhaust pass；
The import first order sample lines and the outlet first order sample lines pass through import second level sample lines respectively
Between connecting CEMS analysis meter with outlet second level sample lines.
2. a kind of big section flue SCR-CEMS flue gas multiple spot mixed in equal amounts second level injection according to claim 1 is quickly adopted
Sampling device, it is characterised in that: the import flue gas sampling branch pipe and exiting flue gas sampling branch pipe are different by 6-10 root respectively
Length, the flute type carbon steel branch pipe composition of different-diameter.
3. a kind of big section flue SCR-CEMS flue gas multiple spot mixed in equal amounts second level injection according to claim 1 is quickly adopted
Sampling device, it is characterised in that: the import flue gas sampling branch pipe and exiting flue gas sampling branch pipe are respectively perpendicular to incoming flow cigarette
Gas arrangement, windward side is respectively arranged with abrasionproof angle iron.
4. a kind of big section flue SCR-CEMS flue gas multiple spot mixed in equal amounts second level injection according to claim 1 is quickly adopted
Sampling device, it is characterised in that: the import first order sample lines and the outlet first order sample lines are respectively that length is
20m-70m, the round carbon steel main pipe that diameter is 100mm-200mm.
5. a kind of big section flue SCR-CEMS flue gas multiple spot mixed in equal amounts second level injection according to claim 1 is quickly adopted
Sampling device, it is characterised in that: the import first order sample lines and the outlet first order sample lines are laid with outside respectively
Heat-preservation cotton.
6. a kind of big section flue SCR-CEMS flue gas multiple spot mixed in equal amounts second level injection according to claim 1 is quickly adopted
Sampling device, it is characterised in that: import second level sample lines and outlet second level sample lines are respectively length 5m-
15m, the CEMS sampling pipe with heat tracing.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108827724A (en) * | 2018-06-21 | 2018-11-16 | 华能国际电力股份有限公司 | A kind of big section flue SCR-CEMS flue gas multiple spot mixed in equal amounts second level injection quick sampling devices and methods therefor |
| CN109884256A (en) * | 2019-03-27 | 2019-06-14 | 河南科技大学 | SCR catalyst container multi-section measuring system |
-
2018
- 2018-06-21 CN CN201820962533.1U patent/CN208579964U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108827724A (en) * | 2018-06-21 | 2018-11-16 | 华能国际电力股份有限公司 | A kind of big section flue SCR-CEMS flue gas multiple spot mixed in equal amounts second level injection quick sampling devices and methods therefor |
| CN108827724B (en) * | 2018-06-21 | 2024-01-26 | 华能国际电力股份有限公司 | Sampling method of flue gas multipoint equivalent mixing two-stage injection rapid sampling device |
| CN109884256A (en) * | 2019-03-27 | 2019-06-14 | 河南科技大学 | SCR catalyst container multi-section measuring system |
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