CN104677700B - The sampling system that fine particle gathers a kind of flue gas containing drop suitable for stationary source - Google Patents
The sampling system that fine particle gathers a kind of flue gas containing drop suitable for stationary source Download PDFInfo
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- CN104677700B CN104677700B CN201510117742.7A CN201510117742A CN104677700B CN 104677700 B CN104677700 B CN 104677700B CN 201510117742 A CN201510117742 A CN 201510117742A CN 104677700 B CN104677700 B CN 104677700B
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Abstract
The present invention relates to the sampling system that fine particle a kind of flue gas containing drop suitable for stationary source gathers, including flue gas preprocessing part, gas sampling gun, dilution aging part, air-out apparatus and particulate matter collecting part, wherein, flue gas preprocessing part includes sample nozzle (1) and gas-liquid whirlwind separator (2)；The main body of gas sampling gun (3) is restrained for nafion；Sample nozzle (1) is connected by gas-liquid whirlwind separator (2) with the front end of gas sampling gun (3).Advantages of the present invention is：Add the effect on moisture extraction of device；It is compact-sized, miniaturization, it is easy to operate.
Description
Technical field
The invention belongs to environmental monitoring technology field, is related to a kind of adopting suitable for stationary source fine particulate matter from high-humidity flue gas
Acquisition means, particularly a kind of sampling system suitable for fine particle flue gas containing drop.
Background technology
China's atmospheric environment outstanding problem at present, regional gray haze take place frequently, and cause extensive concern.Gray haze formed mainly by
Caused by fine particle (PM2.5) in air increases, the PM2.5 of the fixed-contamination source emission based on fire coal is in air
PM2.5 main source.China's stationary source fume treatment mainly uses the method for deduster+wet desulphurization, flue gas after desulfurization liquid
Content height, high humidity, complicated are dripped, the high water capacity fine particle discharged includes solid particulate matter, with acid mist aerosol
SO existing for form3With desulfurization slurry drop etc..
As coal changes the propulsion that gas changes in particular for heating boiler coal gas, heat supply in winter area heating boiler will progressively use day
Right gas is fuel.Although natural gas is clear energy sources, it, which is discharged in flue gas, still contains fine particle.Pot using natural gas as fuel
Fire grate puts that droplet content in flue gas is big, and water capacity is up to more than 10%.
Collection for fine particle in stationary source flue gas, mainly carried out using dilution tunnel method.From twentieth century eight
After the ten's American researcher have developed First fixed source diluting sampling system, fixed source diluting sampling system obtains constantly
Development and perfect, research and development of the China in this system also make some progress.Although fixed source diluting sampling system pair
Fine particle in flue gas has a good collection effect, but the system is larger mainly for dry flue gas or relative humidity but nothing
The flue gas of drop, for the flue gas containing drop its applicability by a definite limitation.
(EPA Method 5, EPA Method 17, EPA Method 201/201A, EPA in the method for U.S. EPA
Method 202, EPA CTM-039 etc.), it is main to be heated using to sampling mouth and sampling gun to prevent flue gas condensing, so
Heat smoke is diluted afterwards, is acquired after the aging of certain time.Due to being heated before flue gas is collected,
The physicochemical properties of flue gas may be caused to change, the particulate matter for making finally to gather has differences with reset condition.At present
Having domestic and foreign scholars face, this is studied.
Research and development of the China for fixed source diluting sampling system, it is to be directed to the flue gas without drop mostly, emphasis is around dilution
Carry out with isokinetic sampling.The patent of invention of Patent No. 200410096562.7 is related to a kind of constant speed tracking fixed source diluting and adopted
Sample system, the invention are characterized in, the pressure parameter and computer regulated flow controller in flue are monitored by Pitot tube, real
The overall process constant speed now sampled, the solution gathered to fine particle in flue gas containing drop, and the system are not referred in invention
Complex, floor space is big.
The patent of invention of Patent No. 200510086292.6 and 201310008119.9 sets up separately although mentioning in intake section
Cutter for particles is counted, but still is to be directed to the flue gas without drop to be designed.
The patent of invention of Patent No. 201410340512.2, the first and second PM2.5 cutters are devised, using one-level
Dilution, excessive gas is discharged by opening up bypass on dilution mixing section, realizes and gas residence time is designed as 10s simultaneously
Reduce and stop building volume, the particulate matter in larger to relative humidity but dripless flue gas has good collection effect, but right
Its applicability of flue gas containing drop is still limited to and its sampling system is still complex.
When being acquired to the flue gas containing drop, drop can be assembled at sample nozzle, influence the effect of constant speed tracking sampling
Fruit, sampling mouth is heated, although partial drop can be made to gasify, when flue gas flow rate is larger, can not still avoid part
Drop enters sampling system.Drop once enters sampling system, considerable influence will be produced to the collection of fine particle, and only by dilute
It is difficult to remove drop that the effect released, which is,.
Further, since dilution flue gas flow rate had differences in different application scenarios, and the volume of dilution chamber be it is fixed,
Not knowing for thinner ratio, certain influence is will also result on measuring accuracy.
In summary, it is necessary to it is further perfect to existing fixed source diluting sampling system, with suitable for cigarette containing drop
The collection of fine particle in gas.
The content of the invention
In order to solve problem above, the invention provides one kind thin suitable for high-humidity gas fume especially flue gas containing drop
The acquisition system of grain thing, the system can be good at removing the drop in flue gas, and sampler structure minimizes, and thinner ratio can be with
Change, carrier gas dosage is small, easy to operate.Technical scheme is as follows：
The sampling system that fine particle gathers a kind of flue gas containing drop suitable for stationary source, including flue gas pretreatment portion
Point, gas sampling gun, dilution aging part, air-out apparatus and particulate matter collecting part, wherein,
The flue gas preprocessing part includes sample nozzle (1) and gas-liquid whirlwind separator (2)；
The main body of described gas sampling gun (3) is restrained for nafion；Sample nozzle (1) passes through gas-liquid whirlwind separator
(2) front end with gas sampling gun (3) is connected；
Diluting aging part includes carrier gas mass flowmenter (6), jet diluter (7), flue gas chamber (8), fixation
Gas Hygrothermograph (9) and gas pressure sensor (10) in flue gas chamber；The gentle body pressure of gas Hygrothermograph passes
Sensor, for monitoring gas parameter；Described jet diluter (7) one end couples with the rear end of gas sampling gun (3)；The other end
It is connected with flue gas chamber (8)；
Described air-out apparatus (11) is connected to the exit of flue gas chamber (8), and described air-out apparatus (11) has two
Individual gas outlet, one of gas outlet (12) communicate with air, and another gas outlet (13) is connected with particulate matter collecting part.
The sampling system that fine particle gathers the flue gas containing drop suitable for stationary source, jet diluter (7) can be with
Including the jet pipe (72) for being fixedly connected on described gas sampling gun (3) rear end being sequentially connected, the rear end of jet pipe (72)
It is connected with dilution chamber (75), diluter nozzle (74) fixed thereon is stretched into dilution chamber (75), is set in dilution chamber (75)
There is carrier gas import (76), the rear end of dilution chamber (75) is provided with the dilute gas mixture diffusion centrum for leading to flue gas chamber (8)
(77), the diameter of diluter nozzle (74) is identical with dilute gas mixture diffusion centrum (77) slot section diameter, has multigroup difference
The combination of specification, thinner ratio is adjusted by changing the combination of different size.
The beneficial effects of the invention are as follows：
(1) solves the collection of particulate matter in stationary source high-humidity gas fume especially flue gas containing drop.
(2) nafion sampling guns are introduced, enhance the effect on moisture extraction of device, be can reach using one-level dilution in flue gas
The collection requirement of particulate matter.
(3) diluted using one-level, flue gas is directly entered chamber after dilution, passes through the choosing of the entrance and exit of diluter
Select, adjust thinner ratio, whole device is compact-sized, modularization, easy to operate, convenience in transport and installation.
Brief description of the drawings
Fig. 1 is the harvester structural representation of fine particle in stationary source flue gas containing drop of the present invention.
In figure：1- sample nozzles；2- gas-liquid whirlwind separators；3-nafion sampling guns；4- sampling gun stainless steel casings；5-
Fluorubber connecting tube；6- gas mass flow gauge；7- jet diluters；8- chambers；9- gas Hygrothermographs；10- gas pressures
Force snesor；11- escape pipes；12- gas outlets 1；13- gas outlets 2；14- cutter for particles；15- sampling films；16- gas matter
Measure flowmeter；17- Constant flow sample pumps.
Fig. 2 is the structural representation of jet diluter 7.
In figure：71- jet pipe fixing bolts；72- jet pipes (flue gas introduces pipe)；73- nozzle mounting seats；74- dilutes
Device nozzle；75- dilution chambers；76- carrier gas imports；77- dilute gas mixtures spread centrum.
Embodiment
The invention will be further described below in conjunction with the accompanying drawings.
The sampling system of the present invention, fine particle gathers suitable for stationary source flue gas containing drop, including flue gas pretreatment
Partly, gas sampling gun, dilution aging part, air-out apparatus and particulate matter collecting part.
Flue gas preprocessing part includes sample nozzle 1 and gas-liquid whirlwind separator 2；Gas sampling gun 3 is restrained by nafion
It is made, is surrounded by stainless steel casing 4.The air inlet of gas-liquid whirlwind separator can install sample nozzle；Gas-liquid separation efficiency ＞ 99%；
Whole height≤80mm；Gas outlet is coupled by attaching nut with nafion sampling guns.Nafion sampling guns are restrained by nafion
It is made, nafion tube banks win pure MD-700 models using the U.S., have removal moisture drying effect.Installed outside sampling gun outside stainless steel
Shell, overall diameter are less than 50mm, and maximum operation temperature is 95 DEG C.Before the device is to be used, flue gas in flue is prejudged, works as cigarette
When containing drop in gas, sample nozzle 1 is coupled into use with gas-liquid whirlwind separator 2, gas-liquid whirlwind separator 2 and naifon is sampled
Rifle 3 is coupled by nut；When being free of drop in flue gas, without using gas-liquid whirlwind separator 2, by sample nozzle 1 and nafion
Sampling gun 3 is coupled by right-angle elbow pipe to be used.
Dilution aging part in carrier gas mass flowmenter 6, jet diluter 7, flue gas chamber 8, chamber 8 including pacifying
The gas Hygrothermograph 9 and gas pressure sensor 10 of dress, flue gas are 10s-15s in the chamber residence time；Sampling gun 3 with it is dilute
Device 7 is released by fluorine rubber-pipe 5 to couple.Diluted using one-level, be designed as jet diluter, air inflow is by gas mass flow gauge control
Make and record.Chamber is coupled with dilution chamber by flange, and gas residence time in chamber is 10 seconds to 15 seconds, chamber
The gentle pressure sensor of gas Hygrothermograph is installed, judges dilution effect by monitoring gas parameter.
Jet diluter 7 is by jet pipe fixing bolt 71, jet pipe (flue gas introduce pipe) 72, nozzle mounting seat 73, dilute
Release device nozzle 74, dilution chamber 75, carrier gas import 76, dilute gas mixture diffusion centrum 77 form.The diameter of diluter nozzle 74
It is identical with the dilute gas mixture diffusion slot section diameter of centrum 77, and the combination with multigroup different size, it can carry out as needed
Change.
There are two gas outlets by the air-out apparatus 11 of jet diluter 7, one of gas outlet 12 communicates with air, separately
One gas outlet 13 is connected with particulate matter collecting part.
Particulate matter collecting part includes cutter for particles 14, sampling film 15, gas mass flow gauge 16 and sampling pump 17.
Gas is adopted by the big flow cutter for particles 14 that can be cut to different diameter airborne particle by corresponding sampling film 15
Collection.
Device to flue gas in flue before use, prejudge, when when containing drop in flue gas, by sample nozzle 1 and gas-liquid rotation
The connection of wind separator 2 is used, and gas-liquid whirlwind separator 2 is coupled with naifon sampling guns 3 by nut；When being free of drop in flue gas
When, without using gas-liquid whirlwind separator 2, sample nozzle 1 is coupled into use with nafion sampling guns 3 by right-angle elbow pipe.
The selection flow of sample nozzle 1 for：Flue gas flow rate in flue is predicted first, secondly joins each part of device successively
Connect, be then turned on carrier gas and sampling pump, test the flue gas and air mass flow of extraction, root respectively with two gas mass flow meters
Nozzle diameter is calculated according to flue gas flow rate and air mass flow.
Choose, the sample nozzle of installation suitable diameter, a whole set of sampling system connection is completed.Sampling gun is stretched into flue, opened
Opening carrier gas and sampling pump can sample.
After nafion sampling guns 3, humidity significantly lowers flue gas.Flue gas is quick through carrier gas in jet diluter 7
Enter chamber 8 after dilution, humidity further reduces, and the mixed flue gas residence time is 10s-15s.It can be simulated in chamber 8
The processes such as nucleation, condensation, cohesion in fume emission to air.Gas Hygrothermograph 9 is installed in chamber and gas pressure passes
Sensor 10, to monitor smoke behavior in chamber, dilution effect is monitored according to smoke behavior.
If flue gas humiture is still higher in chamber, illustrate that thinner ratio is relatively low, thinner ratio need to be increased.In carrier gas air inflow
With extract velocity of flue gas it is constant in the case of, centrum 77 can be spread by changing diluter nozzle 74 and dilute gas mixture to change
The flue gas tolerance of extraction, and then change thinner ratio, flue gas is met sampling request.When need to increase thinner ratio, reduce and extract flue gas
Tolerance, it is replaced by the diluter nozzle of small diameter and corresponding diffusion centrum；When need to reduce thinner ratio, flue gas gas is extracted in increase
Amount, it is replaced by larger-diameter diluter nozzle and corresponding diffusion centrum.
Flue gas has reached particulate matter collection after dilution, aging and required, is gathered through escape pipe 11 by particulate matter collecting part.
Gas outlet 12 communicates with air, and gas outlet 13 is connected with particulate matter collecting part, threeway can be used to realize PM10 and PM2.5 simultaneously
Collection.Open Constant flow sample pump 17 and extract sample gas, mass flowmenter 16 can record the flow of sample gas, pass through sampling
Film 15 traps the particulate matter in sample gas, and sampling film 15 can choose different materials according to analysis demand, such as Teflon film, quartz
Film, nylon membrane etc..
Q shown in accompanying drawing1For flue gas flow, Q2For carrier gas air inflow, Q3To be discharged into the flow of mixed flue gas in air,
Q4With Q5The flow of gas, wherein Q are extracted for sampling pump1+Q2It should be greater than Q4+Q5, so side disclosure satisfy that the flue gas flow of sampling
It is required that.
Claims (1)
1. the sampling system that fine particle gathers a kind of flue gas containing drop suitable for stationary source, including flue gas preprocessing part,
Gas sampling gun, dilution aging part, air-out apparatus and particulate matter collecting part, it is characterised in that
The flue gas preprocessing part includes sample nozzle (1) and gas-liquid whirlwind separator (2)；
The main body of described gas sampling gun (3) is restrained for nafion；Sample nozzle (1) by gas-liquid whirlwind separator (2) with
The front end of gas sampling gun (3) is connected；
Dilution aging part includes carrier gas mass flowmenter (6), jet diluter (7), flue gas chamber (8), is fixed on cigarette
Gas Hygrothermograph (9) and gas pressure sensor (10) in gas chamber；The gentle pressure sensor of gas Hygrothermograph,
For monitoring gas parameter；Described jet diluter (7) one end couples with the rear end of gas sampling gun (3)；The other end and cigarette
Gas chamber (8) is connected；
Described air-out apparatus (11) is connected to the exit of flue gas chamber (8), and described air-out apparatus (11) has two to go out
Gas port, one of gas outlet (12) communicate with air, and another gas outlet (13) is connected with particulate matter collecting part；
Described jet diluter (7) includes the jet for being fixedly connected on described gas sampling gun (3) rear end being sequentially connected
Manage (72), the rear end of jet pipe (72) is connected with dilution chamber (75), and diluter nozzle (74) fixed thereon stretches into dilution chamber
(75) in, carrier gas import (76) is provided with dilution chamber (75), the rear end of dilution chamber (75), which is provided with, leads to flue gas stop
The dilute gas mixture diffusion centrum (77) of room (8), diameter and dilute gas mixture the diffusion centrum (77) of diluter nozzle (74) are narrow
Mouth section diameter is identical, has the combination of multigroup different size, thinner ratio is adjusted by changing the combination of different size.
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Families Citing this family (5)
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| CN105223046A (en) * | 2015-11-16 | 2016-01-06 | 天津市环境监测中心 | Stationary source flue gas particles dilution method automatic constant speed acquisition method |
| CN109164025A (en) * | 2018-11-15 | 2019-01-08 | 中建材环保研究院（江苏）有限公司 | A kind of thermal power plant PM2.5 test device and method |
| CN109406229B (en) * | 2018-11-15 | 2023-08-29 | 华电电力科学研究院有限公司 | High-humidity smoke dilution sampling device and sampling method thereof |
| CN109765083A (en) * | 2018-12-26 | 2019-05-17 | 西安交通大学 | A kind of sampling of high-humidity gas fume particle and measuring device and its application method |
| CN111366422A (en) * | 2020-03-13 | 2020-07-03 | 国电环境保护研究院有限公司 | Method and device for testing slurry fog drops of wet desulphurization system |
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| CN102053048A (en) * | 2009-11-09 | 2011-05-11 | 中国气象科学研究院 | Dynamic aerosol wind tunnel detection system |
| CN104075913A (en) * | 2014-07-17 | 2014-10-01 | 北京航空航天大学 | Dilution sampling device for PM2.5 discharged by stationary pollution source |
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