CN206020116U - A kind of flue gas sampling device - Google Patents

A kind of flue gas sampling device Download PDF

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Publication number
CN206020116U
CN206020116U CN201620857235.7U CN201620857235U CN206020116U CN 206020116 U CN206020116 U CN 206020116U CN 201620857235 U CN201620857235 U CN 201620857235U CN 206020116 U CN206020116 U CN 206020116U
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China
Prior art keywords
gas
passage
dust
probe tube
flue gas
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CN201620857235.7U
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Chinese (zh)
Inventor
何胜
李乾坤
刘沛奇
郑文广
李鹏辉
张鑫
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Huadian Electric Power Research Institute Co Ltd
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Huadian Electric Power Research Institute Co Ltd
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Abstract

The utility model is related to a kind of flue gas sampling device, and its structure includes sampled point, high velocity smoke probe tube, gas injection apparatus and gas offer device;The sampled point connects high velocity smoke probe tube, and the gas offer device provides power for gas injection apparatus, and the gas injection apparatus are used for accelerating sample gas;The high velocity smoke probe tube includes that dust-laden passage and dustless passage, the dust-laden passage are connected with sampled point and gas injection apparatus, and the dustless passage intersects with dust-laden passage and connects.The axial flow that high speed is produced by gas injection apparatus, the dust in sample gas is made to obtain enough acceleration in axial direction, when by dust-laden passage, dust in high velocity air advances according to axial direction, sub-fraction has compared with the dustless sample gas of low Doppler velocity through tube wall simultaneously, discharge from dustless passage, so as to realize that flue gas is separated with dust.

Description

A kind of flue gas sampling device
Technical field
The utility model is related to a kind of detection means, particularly a kind of flue gas sampling device.
Background technology
Station boiler can produce substantial amounts of high-temperature flue gas in combustion, contain substantial amounts of powder in these high-temperature flue gas The pollutant such as dirt, NOx, SO2, Hg.Therefore, every country all defines the discharge of different pollutants for coal-fired flue-gas in the world Limit value, in order to meet different emission limits, coal-fired power station boiler afterbody has installed a series of fume treatment facilities additional, such as SCR equipment for denitrifying flue gas, electrostatic precipitator, wet desulphurization device etc., after processing for the various environment treating facilities of accurate measurements Whether flue gas meets national standard requirement, has typically been respectively mounted online flue gas prison before and after each flue gas pollutant treatment facility Device is surveyed, or the flue gas pollutant that some discharge is monitored by way of manual sampling.Either in on-line monitoring Or a key precondition condition of artificial sample is all must accurately to extract fume sample.
At present, the flue gas sampling in CEM samplings and artificial sample system is mainly using two kinds of heat pipe sampling and dilution sampling Mainstream technology, using arranging fore filter, flue gas can just enter after first passing around the filtration of filter for two kinds of sampling apparatuses Enter flue gas analyzer, although this sampling method and device solve in flue gas dust to this kind of Conventional pollution such as NOx, SO2 The adverse effect of sample analysis, but for the pollutant easily by adsorbing powder dust such as SO3, heavy metal Hg, when flue gas is passed through When crossing the fore filter of dust accumulations in a large number, these pollutants will be captured on preposition filter, ultimately resulted in through mistake During filter in flue gas this pollutant loss, cause final testing result deviation.In addition also can containing a large amount of steam in flue gas Very big impact, and serious curtailment instrument service life is brought on the accuracy of smoke sampling.Existing technology such as China is specially Profit bulletin CN205280445U is solved the above problems by arranging back-blowing device and moisture trap etc., but all undoubtedly increased The complexity of sampling equipment, also cannot avoid the generation of the problems referred to above completely.
Therefore, how a kind of brand-new smoke sampling method and device of design is developed, to solve powder during smoke sampling The impact of dirt and moisture to sampling, is a difficult problem of those skilled in the art of the present technique's urgent need to resolve.
Utility model content
Technical problem to be solved in the utility model is to provide one kind makes flue gas accelerate acquisition sufficiently high in axial direction Speed flue gas sampling device, the gaseous sample of needs is separated by high velocity smoke, so as to solve smoke sampling mistake The impact of dust and moisture to sampling in journey, reaches accurate measurement and extends the effect of instrument service life.
The utility model solves the technical scheme that adopted of above-mentioned technical problem:
A kind of flue gas sampling device, its structure include that sampled point, high velocity smoke probe tube, gas injection apparatus and gas are carried For device;The sampled point connects high velocity smoke probe tube, and the gas offer device provides power for gas injection apparatus, institute Stating gas injection apparatus is used for accelerating sample gas;The high velocity smoke probe tube includes dust-laden passage and dustless passage, described Dust-laden passage is connected with sampled point and gas injection apparatus, and the dustless passage intersects with dust-laden passage and connects.By gas Injection apparatus produces the axial flow of high speed, makes the dust in sample gas obtain enough acceleration in axial direction, is passing through During dust-laden passage, the dust in high velocity air advances according to axial direction, while sub-fraction is with dustless compared with low Doppler velocity Sample gas passes through tube wall, discharges, so as to realize that flue gas is separated with dust from dustless passage.
Further, heater is provided with outside the high velocity smoke probe tube.High velocity smoke is taken by heater Sample pipe is heated, and the temperature of sampling is heated to above flue gas dew point temperature, prevents flue gas in the pipe of high velocity smoke probe tube Condensing on wall affects sample gas, so as to improving accuracy of detection and preventing from corroding.Between high velocity smoke probe tube and heater Heat filling is filled with, heat-conducting silicone grease is typically chosen.
Further, the high velocity smoke probe tube by quartz glass tube, earthenware or scribbles the stainless steel of inert coatings Pipe is constituted.For preventing the composition in high velocity smoke probe tube and flue gas from reacting or corroding, high velocity smoke probe tube is excellent The stainless steel tube of inert coatings is selected using quartz glass tube, earthenware or scribbles, so as to improving sampling precision and preventing from corroding.
Preferably, being additionally provided with protection sleeve pipe outside the high velocity smoke probe tube, the heater is arranged at a high speed Between gas sampling probe and protection sleeve pipe.For strengthening high velocity smoke probe tube intensity, in high velocity smoke probe tube and heater Outer setting protective case pipe.
Further, also include draw-out device, the draw-out device is connected with dustless passage.By arranging draw-out device, Dustless sample gas can be made to extract out from high velocity smoke probe tube with stable relatively low flow velocity, take improve more easily separated with dust of flue gas Sample precision.
Preferably, the dustless passage is in be more than or equal to 90 degree with the sample gas orientation angle in dust-laden passage.For Prevent the dust near dust-laden passage tube wall from extracting out from dustless passage, the setting of dustless passage should be with sample gas axially-movable Direction is completely vertical or conversely, improving accuracy of detection.
Further, also include blending bin, the blending bin is connected with dustless passage and gas offer device respectively.Pass through Arranging blending bin makes dustless sample gas dilute in blending bin, reduces detection sample gas concentration, reduces the corrosion of pipeline and instrument.
Further, the first controlling switch is provided between the gas offer device and blending bin, and the gas provides dress Putting and the second controlling switch being provided with between gas injection apparatus, the aperture of first controlling switch and the second controlling switch can Control.Gas offer device can be made to meet gas injection by arranging the first controllable controlling switch of aperture and the second controlling switch The compressed air of device needs, and by meeting blending bin desired gas, and can be adjusted according to real work situation at any time.
Preferably, be provided with device for pressure measurement between the high velocity smoke probe tube and gas injection apparatus, described adopt Sample gas is 20~30m/s in the velocity interval of dust-laden channel direction.By the pressure in device for pressure measurement detecting system from And monitor sample gas speed, it is ensured that sample gas dust-laden channel direction velocity interval in 20~30m/s, it is ensured that powder Dirt have enough axially through dust-laden passage, dustless flue gas can be separated from dustless passage, improve sampling precision.Wherein press Force measuring device is preferably Venturi meter.
The utility model compared with the existing technology has advantages below and effect:High speed is produced by gas injection apparatus Axial flow, makes the dust in sample gas obtain enough acceleration in axial direction, when by dust-laden passage, high velocity air In dust advance according to axial direction, while sub-fraction has passes through tube wall compared with low Doppler velocity gaseous sample, from dustless Discharge in passage, so as to realize that flue gas is separated with dust.Design by high velocity smoke probe tube:Structure, protection device and Heater, further increases sampling precision and extends the service life of instrument.Improvement by dustless passage:Extract dress Put and fit angle, further improve sampling precision.Global optimization finally by system:Blending bin, controlling switch, pressure Force measuring device and sample gas flow velocity, on sampling precision and instrument service life have obtained further improving.
Description of the drawings
In order to be illustrated more clearly that the utility model embodiment or technical scheme of the prior art, below will be to embodiment Or accompanying drawing to be used is briefly described needed for description of the prior art, it should be apparent that, drawings in the following description are only It is some embodiments of the present utility model, for those of ordinary skill in the art, before creative labor is not paid Put, can be with according to these other accompanying drawings of accompanying drawings acquisition.
Fig. 1 is structural representation of the present utility model.
Structural representations of the Fig. 2 for high velocity smoke probe tube.
Label declaration:
1 high velocity smoke probe tube of sampled point, 2 dust-laden passage 21
Sleeve pipe 24 protected by 22 heater of dustless passage 23
3 gas offer device of gas injection apparatus, 4 blending bin 5
First 6 second controlling switch of controlling switch, 7 device for pressure measurement 8
91 waste gas gas outlet 92 of detection sample gas gas outlet
Specific embodiment
The utility model is described in further detail with reference to embodiment, following examples are to the utility model Explanation and the utility model is not limited to following examples.
Embodiment 1:
As shown in Fig. 1 to 2, the present embodiment is carried by sampled point 1, high velocity smoke probe tube 2, gas injection apparatus 3 and gas Constitute for device 4, wherein the connection of sampled point 1 high velocity smoke probe tube 2, gas injection apparatus 3 are jet pump, gas offer device 4 is that gas injection apparatus 3 provide compressed air, so that the sample gas for entering high velocity smoke probe tube 2 from sampled point 1 reach The axial flow of 20~30m/s, accelerates the dust in sample gas;High velocity smoke probe tube 2 includes dust-laden passage 21 and dustless Passage 22, dust-laden passage 21 are set to the sample gas inflow direction from sampled point 1, and dustless passage 22 is connected and perpendicular to dust-laden Passage 21.When by dust-laden passage 21, the dust in high velocity air advances sample gas according to axial direction, while a little portion Divide and have compared with the dustless sample gas of low Doppler velocity through tube wall, discharged simultaneously from dustless passage by draw-out device (not shown) Detection gas outlet 91 is entered, remaining sample gas are discharged from waste gas gas outlet 92.
Embodiment 2:
As shown in Fig. 1 to 2, embodiment 2 increased heater 23 and protection sleeve pipe 24 on the basis of embodiment 1, high Fast gas sampling probe 2 adds inert coatings to constitute by stainless steel tube, and the selection of inert coatings is not reacted with smoke components. Wherein heater 23 is arranged on outside high velocity smoke probe tube 2, passes through heat conduction between high velocity smoke probe tube 2 and heater 23 Silicone grease connects.Protection sleeve pipe 24 is additionally provided with outside heater 23 and high velocity smoke probe tube 2.
Embodiment 3:
As shown in Fig. 1 to 2, embodiment 3 increased blending bin 5, the first controlling switch 6, second on the basis of embodiment 2 Controlling switch 7 and device for pressure measurement 8, blending bin 5 be a closed container, respectively with dustless passage 22, gas offer device 4 and Detection gas outlet 91 connects, and dustless sample gas initially enters blending bin 5 and gas offer device 4 from after the extraction of dustless passage 22 The gas of offer is diluted, then by detecting that gas outlet 91 is discharged.By the between gas offer device 4 and blending bin 5 One controlling switch 6 connects, and the first controlling switch 6 is proportioning valve in order to controlling dilute strength.Gas offer device 4 and gas injection Connected by the second controlling switch 7 between device 3, the second controlling switch 7 is proportioning valve in order to controlling the air-flow of gas injection apparatus 3 Acceleration situation, is provided with device for pressure measurement 8 between gas injection apparatus 3 and high velocity smoke probe tube 2, device for pressure measurement 8 is Venturi meter, in order to detect that air-flow accelerates situation.
In above-described embodiment, high velocity smoke probe tube 2 can also be chosen as quartz glass tube or earthenware, dustless passage 22 Can also incline towards sampled point direction and connect with dust-laden passage 21, can achieve the utility model purpose.
Furthermore, it is necessary to illustrate, the specific embodiment described in this specification, the shape of its parts and components, it is named Title etc. can be with difference.The equivalent or simple change done by all constructions according to described in the utility model inventional idea, feature and principle, It is included in the protection domain of the utility model patent.The utility model person of ordinary skill in the field can be to being retouched The specific embodiment that states is made various modifications or supplements or substituted using similar mode, without departing from the utility model Structure or surmount scope defined in the claims, protection domain of the present utility model all should be belonged to.

Claims (9)

1. a kind of flue gas sampling device, it is characterised in that:Gentle including sampled point, high velocity smoke probe tube, gas injection apparatus Body offer device;The sampled point connects high velocity smoke probe tube, and the gas offer device provides dynamic for gas injection apparatus Power, the gas injection apparatus are used for accelerating sample gas;The high velocity smoke probe tube includes dust-laden passage and dustless passage, The dust-laden passage is connected with sampled point and gas injection apparatus, and the dustless passage intersects with dust-laden passage and connects.
2. flue gas sampling device according to claim 1, it is characterised in that:Be provided with outside the high velocity smoke probe tube plus Thermal.
3. flue gas sampling device according to claim 2, it is characterised in that:The high velocity smoke probe tube is by quartz glass Pipe, earthenware or scribble inert coatings stainless steel tube constitute.
4. flue gas sampling device according to claim 3, it is characterised in that:It is additionally provided with outside the high velocity smoke probe tube Protection sleeve pipe, the heater are arranged between high velocity smoke probe tube and protection sleeve pipe.
5. flue gas sampling device according to claim 1, it is characterised in that:Also include draw-out device, the draw-out device It is connected with dustless passage.
6. flue gas sampling device according to claim 5, it is characterised in that:Adopting in the dustless passage and dust-laden passage Sample gas direction angle is in more than or equal to 90 degree.
7. according to the arbitrary described flue gas sampling device of claim 1 to 6, it is characterised in that:Also include blending bin, the mixing Case is connected with dustless passage and gas offer device respectively.
8. flue gas sampling device according to claim 7, it is characterised in that:Set between the gas offer device and blending bin The first controlling switch is equipped with, the second controlling switch between the gas offer device and gas injection apparatus, is provided with, described first The aperture of controlling switch and the second controlling switch is controllable.
9. flue gas sampling device according to claim 8, it is characterised in that:The high velocity smoke probe tube and gas injection Device for pressure measurement is provided between device, and the sample gas are 20~30m/s in the velocity interval of dust-laden channel direction.
CN201620857235.7U 2016-08-08 2016-08-08 A kind of flue gas sampling device Active CN206020116U (en)

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CN201620857235.7U CN206020116U (en) 2016-08-08 2016-08-08 A kind of flue gas sampling device

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Application Number Priority Date Filing Date Title
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Publications (1)

Publication Number Publication Date
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106053156A (en) * 2016-08-08 2016-10-26 华电电力科学研究院 Flue gas sampling device and method thereof

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106053156A (en) * 2016-08-08 2016-10-26 华电电力科学研究院 Flue gas sampling device and method thereof
CN106053156B (en) * 2016-08-08 2019-03-01 华电电力科学研究院 Flue gas sampling device and method

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