CN104677700A - Sampling system suitable for sampling fine particles in fixed-source droplet-containing flue gas - Google Patents
Sampling system suitable for sampling fine particles in fixed-source droplet-containing flue gas Download PDFInfo
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- CN104677700A CN104677700A CN201510117742.7A CN201510117742A CN104677700A CN 104677700 A CN104677700 A CN 104677700A CN 201510117742 A CN201510117742 A CN 201510117742A CN 104677700 A CN104677700 A CN 104677700A
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Abstract
The invention relates to a sampling system suitable for sampling fine particles in fixed-source droplet-containing flue gas. The sampling system comprises a flue gas pretreating part, a flue gas sampling gun, a diluting and aging part, a gas outlet device and a particle collecting part, wherein the flue gas pretreating part comprises a sampling nozzle (1) and a gas-liquid cyclone separator (2); the main body of the flue gas sampling gun (3) is a nafion tube bundle; the sampling nozzle (1) is connected with the front end of the flue gas sampling gun (3) through the gas-liquid cyclone separator (2). The sampling system has the advantages as follows: the dehumidifying effect of a device is improved; the sampling system is compact and miniaturized in structure, and easy and simple to operate.
Description
Technical field
The invention belongs to environmental monitoring technology field, relate to a kind of harvester being applicable to stationary source fine particulate matter from high-humidity flue gas, particularly a kind of sampling system be applicable to containing fine particle in drop flue gas.
Background technology
Current China atmospheric environment outstanding problem, regional gray haze takes place frequently, and causes extensive concern.Gray haze is formed mainly to be increased by the fine particle (PM2.5) in air and causes, and the PM2.5 of the fixed-contamination source emission based on fire coal is the main source of PM2.5 in air.China's stationary source fume treatment mainly adopts the method for fly-ash separator+wet desulphurization, and flue gas after desulfurization droplet content is high, high humidity, complicated, the SO that the high water capacity fine particle discharged comprises solid particulate matter, exists with acid mist aerosol shape
3drip with desulfurization slurry.
Along with coal change gas especially heating boiler coal change the propelling of gas, heat supply in winter area heating boiler will progressively use rock gas for fuel.Although rock gas is clear energy sources, still containing fine particle in its discharge flue gas.Be that in the boiler emission flue gas of fuel, droplet content is large with rock gas, water capacity can reach more than 10%.
For the collection of fine particle in stationary source flue gas, the main dilution tunnel method that adopts is carried out.After the 1980s, American Studies personnel have developed First fixed source diluting sampling system, fixed source diluting sampling system obtains continuous development and improvement, and the research and development of China in this system also make some progress.Although fixed source diluting sampling system has good collection effect to the fine particle in flue gas, but this system is mainly for the flue gas of the comparatively large dripless of dry flue gas or relative humidity, is subject to a definite limitation for its applicability of flue gas containing drop.
In the method for U.S. EPA (EPA Method 5, EPA Method 17, EPA Method 201/201A, EPA Method 202, EPA CTM-039 etc.), for preventing flue gas condensing, main employing is heated sampling mouth and sampling gun, then heat smoke is diluted, through certain hour aging after gather.Owing to heating before flue gas is collected, the physicochemical property of flue gas may be caused to change, the particle of final collection and virgin state be there are differences.Chinese scholars is had just to study this at present.
Mostly China, for the research and development of fixed source diluting sampling system, is that, for the flue gas not containing drop, emphasis is carried out around dilution and isokinetic sampling.The patent No. be 200410096562.7 patent of invention relate to a kind of contour tracking fixed source diluting sampling system, the feature of this invention is, by the pressure parameter in pitot tube monitoring flue and computer regulated flow controller, realize the overall process constant speed of sampling, the not mentioned solution to gathering containing fine particle in drop flue gas in invention, and this system is comparatively complicated, floor area is large.
Although the patent of invention that the patent No. is 200510086292.6 and 201310008119.9 is mentioned at induction part design cutter for particles, but still be carry out designing for the flue gas not containing drop.
The patent No. is the patent of invention of 201410340512.2, devise the first and second PM2.5 cutters, employing one-level is diluted, by offering bypass in dilution mixture section, excessive gas is discharged, achieve and gas residence time is designed to 10s and reduces chamber volume, comparatively large to relative humidity but particle in the flue gas of dripless has good collection effect, but to still to be limited to containing its applicability of drop flue gas and its sampling system is still comparatively complicated.
When gathering the flue gas containing drop, drop can be assembled at sample nozzle place, affects the effect that constant speed follows the trail of sampling, sampling mouth is heated, although partial drop can be made to gasify, when flue gas flow rate is larger, partial drop still cannot be avoided to enter sampling system.Drop, once enter sampling system, produce considerable influence, and the effect only by diluting is difficult to drop to remove by the collection of fine particle.
In addition, because dilution flue gas flow rate there are differences in different application scenarios, and the volume of dilution chamber is fixing, dilution ratio uncertain, also can cause certain influence to measuring accuracy.
In sum, be necessary existing fixed source diluting sampling system perfect further, to be applicable to the collection containing fine particle in drop flue gas.
Summary of the invention
In order to overcome the above problems, the invention provides a kind of acquisition system being applicable to high-humidity gas fume and especially containing fine particle in drop flue gas, this system can be good at removing the drop in flue gas, and sampler structure miniaturization, dilution ratio can change, and carrier gas consumption is little, easy to operate.Technical scheme of the present invention is as follows:
Be applicable to the sampling system that stationary source gathers containing fine particle in drop flue gas, comprise flue gas preprocessing part, gas sampling gun, the aging part of dilution, air-out apparatus and particle collecting part, wherein,
Described flue gas preprocessing part comprises sample nozzle (1) and gas-liquid whirlwind separator (2);
The main body of described gas sampling gun (3) is nafion tube bank; Sample nozzle (1) is connected by the front end of gas-liquid whirlwind separator (2) with gas sampling gun (3);
Dilute aging part to comprise carrier gas mass flowmeter (6), jet diluter (7), flue gas chamber (8), be fixed on gas temperature hygrometer (9) in flue gas chamber and gas pressure sensor (10); Gas temperature hygrometer and gas pressure sensor, for gas-monitoring parameter; Described jet diluter (7) one end connects with the rear end of gas sampling gun (3); The other end is connected with flue gas chamber (8);
Described air-out apparatus (11) is connected to the exit of flue gas chamber (8), described air-out apparatus (11) has two gas outlets, one of them gas outlet (12) communicates with air, and another gas outlet (13) are connected with particle collecting part.
The described sampling system being applicable to stationary source and gathering containing fine particle in drop flue gas, jet diluter (7) can comprise the jet pipe (72) being fixedly connected on described gas sampling gun (3) rear end be connected successively, the rear end of jet pipe (72) is connected with dilution chamber (75), diluter nozzle (74) fixed thereon is stretched in dilution chamber (75), dilution chamber (75) is provided with carrier gas import (76), the rear end of dilution chamber (75) is provided with dilute gas mixture diffusion centrum (77) leading to flue gas chamber (8), the diameter of diluter nozzle (74) is identical with dilute gas mixture diffusion centrum (77) slot section diameter, there is the combination of many group different sizes, dilution ratio is regulated by the combination changing different size.
The invention has the beneficial effects as follows:
(1) stationary source high-humidity gas fume is solved especially containing the collection of particle in drop flue gas.
(2) introduce nafion sampling gun, enhance the effect on moisture extraction of device, use one-level dilution can reach the collection requirement of particle in flue gas.
(3) adopt one-level dilution, flue gas directly enters chamber after dilution, by the selection of the entrance and exit of diluter, regulate dilution ratio, whole apparatus structure be compact, modularization, easy and simple to handle, convenient transport with install.
Accompanying drawing explanation
Fig. 1 is the harvester structural representation of stationary source of the present invention containing fine particle in drop flue gas.
In figure: 1-sample nozzle; 2-gas-liquid whirlwind separator; 3-nafion sampling gun; 4-sampling gun stainless steel casing; 5-fluororubber connecting pipe; 6-mass-flow gas meter; 7-jet diluter; 8-chamber; 9-gas temperature hygrometer; 10-gas pressure sensor; 11-escape pipe; 12-gas outlet 1; 13-gas outlet 2; 14-cutter for particles; 15-sampling film; 16-mass-flow gas meter; 17-Constant flow sample pump.
Fig. 2 is the structural representation of jet diluter 7.
In figure: 71-jet pipe set bolt; 72-jet pipe (flue gas inlet tube); 73-nozzle mounting seat; 74-diluter nozzle; 75-dilution chamber; The import of 76-carrier gas; 77-dilute gas mixture diffusion centrum.
Embodiment
Below in conjunction with accompanying drawing, the invention will be further described.
Sampling system of the present invention, is applicable to stationary source containing fine particle collection in drop flue gas, comprises flue gas preprocessing part, gas sampling gun, the aging part of dilution, air-out apparatus and particle collecting part.
Flue gas preprocessing part comprises sample nozzle 1 and gas-liquid whirlwind separator 2; Gas sampling gun 3 is restrained by nafion and is made, and is surrounded by stainless steel casing 4.The air intake opening of gas-liquid whirlwind separator can install sample nozzle; Gas-liquid separation efficiency > 99%; Whole height≤80mm; Gas outlet is connected with nafion sampling gun by attaching nut.Nafion sampling gun is restrained by nafion and is made, and nafion tube bank adopts the U.S. to win pure MD-700 model, has removal moisture drying effect.Sampling gun installs stainless steel casing outward, and overall diameter is less than 50mm, and maximum operation temperature is 95 DEG C.Before the device is to be used, carry out anticipation to flue gas in flue, when containing drop in flue gas, sample nozzle 1 is connected use with gas-liquid whirlwind separator 2, and gas-liquid whirlwind separator 2 is connected by nut with naifon sampling gun 3; When in flue gas containing drop time, do not use gas-liquid whirlwind separator 2, sample nozzle 1 and nafion sampling gun 3 connected by right-angle bend and uses.
Dilute aging part and comprise gas temperature hygrometer 9 and gas pressure sensor 10 that carrier gas mass flowmeter 6, jet diluter 7, flue gas chamber 8, chamber 8 are installed, flue gas is 10s-15s in the chamber residence time; Sampling gun 3 is connected by fluorine rubber-pipe 5 with diluter 7.Employing one-level is diluted, and be designed to jet diluter, air inflow is controlled and record by mass-flow gas meter.Chamber and dilution chamber are by flange connect, and gas residence time in chamber is 10 seconds to 15 seconds, and chamber installing gas Hygrothermograph and gas pressure sensor, judge dilution effect by gas-monitoring parameter.
Jet diluter 7 is spread centrum 77 formed by jet pipe set bolt 71, jet pipe (flue gas inlet tube) 72, nozzle mounting seat 73, diluter nozzle 74, dilution chamber 75, carrier gas import 76, dilute gas mixture.The diameter of diluter nozzle 74 is identical with dilute gas mixture diffusion centrum 77 slot section diameter, and has the combination of many group different sizes, can change as required.
Air-out apparatus 11 through jet diluter 7 has two gas outlets, and one of them gas outlet 12 communicates with air, and another gas outlet 13 is connected with particle collecting part.
Particle collecting part comprises cutter for particles 14, sampling film 15, mass-flow gas meter 16 and sampling pump 17.Gas through the large discharge cutter for particles 14 that can cut different diameter airborne particle, gather by corresponding sampling film 15.
Device carries out anticipation to flue gas in flue before using, and when containing drop in flue gas, sample nozzle 1 is connected use with gas-liquid whirlwind separator 2, and gas-liquid whirlwind separator 2 is connected by nut with naifon sampling gun 3; When in flue gas containing drop time, do not use gas-liquid whirlwind separator 2, sample nozzle 1 and nafion sampling gun 3 connected by right-angle bend and uses.
The selection flow process of sample nozzle 1 is: first predict flue gas flow rate in flue, secondly each for device parts are connected successively, then open carrier gas and sampling pump, test flue gas and the air mass flow of extraction with two mass-flow gas meters respectively, calculate nozzle diameter according to flue gas flow rate and air mass flow.
Choose, install the sample nozzle of suitable diameter, a whole set of sampling system has connected.Sampling gun is stretched into flue, and unlatching carrier gas and sampling pump can be sampled.
Flue gas is after nafion sampling gun 3, and humidity significantly lowers.After carrier gas rapid dilution, enter chamber 8 at flue gas in jet diluter 7, humidity reduces further, and the mixed flue gas residence time is 10s-15s.The process such as nucleation, condensation, cohesion in air can be discharged into by simulated flue gas in chamber 8.Installing gas Hygrothermograph 9 and gas pressure sensor 10 in chamber, to monitor smoke behavior in chamber, according to smoke behavior monitoring dilution effect.
If flue gas humiture is still higher in chamber, illustrate that dilution ratio is lower, need dilution ratio be increased.When carrier gas air inflow and extraction velocity of flue gas are constant, change the flue gas tolerance of extraction by replacing diluter nozzle 74 and dilute gas mixture diffusion centrum 77, and then change dilution ratio, make flue gas meet sampling request.When need increase dilution ratio, reduce and extract flue gas tolerance, be replaced by the diluter nozzle of small diameter and spread centrum accordingly; When need reduce dilution ratio, increase and extract flue gas tolerance, be replaced by larger-diameter diluter nozzle and spread centrum accordingly.
Flue gas through dilution, aging after reached particle gather requirement, gathered by particle collecting part through escape pipe 11.Gas outlet 12 communicates with air, and gas outlet 13 is connected with particle collecting part, and threeway can be used to realize the collection of PM10 and PM2.5 simultaneously.Open Constant flow sample pump 17 and extract sample gas, mass flowmeter 16 can record the flow of sample gas, trapped the particle in sample gas by sampling film 15, sampling film 15 can choose different materials according to analysis demand, as Teflon film, quartz film, nylon membrane etc.
Q shown in accompanying drawing
1for flue gas flow, Q
2for carrier gas air inflow, Q
3for entering the flow of mixed flue gas in air, Q
4with Q
5for the flow of sampling pump extracting gases, wherein Q
1+ Q
2q should be greater than
4+ Q
5, so enough can meet the flue gas flow requirement of sampling.
Claims (2)
1. be applicable to the sampling system that stationary source gathers containing fine particle in drop flue gas, comprise flue gas preprocessing part, gas sampling gun, the aging part of dilution, air-out apparatus and particle collecting part.It is characterized in that,
Described flue gas preprocessing part comprises sample nozzle (1) and gas-liquid whirlwind separator (2);
The main body of described gas sampling gun (3) is nafion tube bank; Sample nozzle (1) is connected by the front end of gas-liquid whirlwind separator (2) with gas sampling gun (3);
Dilute aging part to comprise carrier gas mass flowmeter (6), jet diluter (7), flue gas chamber (8), be fixed on gas temperature hygrometer (9) in flue gas chamber and gas pressure sensor (10); Gas temperature hygrometer and gas pressure sensor, for gas-monitoring parameter; Described jet diluter (7) one end connects with the rear end of gas sampling gun (3); The other end is connected with flue gas chamber (8);
Described air-out apparatus (11) is connected to the exit of flue gas chamber (8), described air-out apparatus (11) has two gas outlets, one of them gas outlet (12) communicates with air, and another gas outlet (13) are connected with particle collecting part.
2. be applicable to the sampling system that stationary source gathers containing fine particle in drop flue gas as claimed in claim 1, it is characterized in that, jet diluter (7) comprises the jet pipe (72) being fixedly connected on described gas sampling gun (3) rear end be connected successively, the rear end of jet pipe (72) is connected with dilution chamber (75), diluter nozzle (74) fixed thereon is stretched in dilution chamber (75), dilution chamber (75) is provided with carrier gas import (76), the rear end of dilution chamber (75) is provided with dilute gas mixture diffusion centrum (77) leading to flue gas chamber (8), the diameter of diluter nozzle (74) is identical with dilute gas mixture diffusion centrum (77) slot section diameter, there is the combination of many group different sizes, dilution ratio is regulated by the combination changing different size.
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Cited By (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 |
| CN109406229A (en) * | 2018-11-15 | 2019-03-01 | 华电电力科学研究院有限公司 | A kind of high-humidity gas fume dilution sampling device and its method of sampling |
| 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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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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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 |
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| 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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