CN203432825U - Flow-equalized anti-blocking flue gas sampling gun - Google Patents

Flow-equalized anti-blocking flue gas sampling gun Download PDF

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Publication number
CN203432825U
CN203432825U CN201320585806.2U CN201320585806U CN203432825U CN 203432825 U CN203432825 U CN 203432825U CN 201320585806 U CN201320585806 U CN 201320585806U CN 203432825 U CN203432825 U CN 203432825U
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flue gas
sampling
smoke
charge
gas sampling
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CN201320585806.2U
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侯凡军
刘科
郝卫东
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State Grid Corp of China SGCC
Electric Power Research Institute of State Grid Shandong Electric Power Co Ltd
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Abstract

The utility model discloses a flow-equalized anti-blocking flue gas sampling gun which comprises a flue gas sampling tube, a sealing seat, flow-equalized holes, a flue gas mixing chamber and a flue gas outlet tube, wherein the flue gas sampling tube comprises multiple branch flue gas sampling tubes which are different in length, one ends of the multiple branch flue gas sampling tubes are fixed in the sealing seat, the other ends of the multiple branch flue gas sampling tubes are respectively provided with a flue gas sampling mouth, the flow-equalized holes are formed in the tail ends of joints of the branch flue gas sampling tubes and the sealing seat, the flue gas mixing chamber is connected with the flue gas sampling tube, and the flue gas mixing chamber is communicated with the flue gas outlet tube. According to the sampling gun, a situation that the flue gas flow rate of each flue gas sampling point is equal is realized, and the accuracy of oxygen content measurement of flue gas is improved; the ash deposition on the flue gas sampling gun can be prevented, so that the application reliability of the flue gas sampling gun is improved.

Description

The anti-blocking flue gas sampling gun of current-sharing
Technical field
The utility model relates to a kind of coal-fired boiler combustion smoke sampling rifle, relates in particular to the anti-blocking flue gas sampling gun of a kind of current-sharing.
Background technology
Flue gas oxygen content is one of key parameter of reflection coal-fired boiler in thermal power plant burning performance, when carrying out boiler performance certification test, air-heater leakage test, the test of denitrification apparatus environmental protection inspection and acceptance, all needs flue gas oxygen content to measure.Boiler back end ductwork sectional dimension is very large, when flue gas enters back-end ductwork after burner hearth internal combustion, have more serious backlayering phenomenon, and the horizontal mixing of flue gas in flue is poor, thus the oxygen amount composition in flue gas on the whole cross section of flue, to distribute be very inhomogeneous.In order to obtain flue gas oxygen content accurately, national Specification adopts grid survey flue gas oxygen content.
Smoke sampling rifle in grid survey flue gas oxygen content method mainly contains two kinds of forms now: flute type tubular type smoke sampling rifle and three is in charge of assembled smoke gas sampling gun.The aperture that flute type tubular type smoke sampling rifle is 2mm along the uniform a plurality of diameters of stopple coupon, during actual sampling, aperture is the closer to sampling gun end, in aperture, negative pressure is larger, flue gas differential pressure inside and outside aperture is larger, and flue gas flow is also larger, because each aperture is got exhaust gas volumn difference,, between measurement result and actual oxygen level, there is relatively large deviation in the representative variation that it mixes oxygen level in rear flue gas; Three are in charge of that assembled smoke gas sampling gun is welded side by side by three identical weldless steel tubes of caliber, although each sampling spot flue gas flow deviation reduces to some extent, but because each length of tube is different, on-way resistance is naturally different, therefore during actual smoke sampling, owing to being respectively in charge of got exhaust gas volumn difference, it mixes the same variation of representativeness of oxygen level in rear flue gas, between measurement result and actual oxygen level, also brings deviation.
Above two kinds of smoke sampling rifles, institute gets in flue gas and all contains a large amount of fly ash granules, and fly ash granule enters smoke sampling rifle with flue gas, can cause smoke sampling rifle to stop up.
Utility model content
In order to overcome the above problems, the utility model provides a kind of current-sharing anti-blocking flue gas sampling gun.It is even that this smoke sampling rifle can be realized each point flue gas flow, has choke preventing function simultaneously.
To achieve these goals, the utility model adopts following technical scheme:
An anti-blocking flue gas sampling gun, comprising: gas sampling probe, sealing socket, equal discharge orifice, flue gas mixing-chamber and flue gas fairlead; Described gas sampling probe comprises that the different a plurality of smoke samplings of length are in charge of, one end that described a plurality of smoke sampling is in charge of is fixed in described sealing socket, the other end that described a plurality of smoke sampling is in charge of arranges respectively smoke sampling mouth, described equal discharge orifice is arranged on described smoke sampling and is in charge of the end with described sealing socket junction, described flue gas mixing-chamber is connected with described gas sampling probe, and described flue gas mixing-chamber is communicated with described flue gas fairlead.
The caliber that described a plurality of smoke sampling is in charge of is identical, and described a plurality of smoke samplings are in charge of side by side and are welded together.
Described smoke sampling mouth carrys out flow path direction back to flue gas, and the mouth that enters of described smoke sampling mouth is designed to concave shaped, and the suction inlet of smoke sampling mouth is positioned at the center of concave shaped space; Described smoke sampling mouth comes flow path direction that taper table top is set over against flue gas.
Described sealing socket is fixed on the smoke sampling barrel block on flue tube wall by screw thread.
The flue gas flow that described in the Assurance of Size of described equal discharge orifice, a plurality of smoke samplings are in charge of is identical.
The beneficial effects of the utility model:
1. the utility model has been realized each smoke sampling point flue gas flow and has been equated, has improved the accuracy that Oxygen Amount in Flue Gas is measured.
2. the utility model can prevent smoke sampling rifle dust stratification, has improved the reliability that smoke sampling rifle uses.
3. in the system of grid survey Oxygen Amount in Flue Gas, if substitute flute type tubular type smoke sampling rifle with the anti-blocking flue gas sampling gun of current-sharing, by adjusting the size of equal discharge orifice, the exhaust gas volumn of all smoke sampling points of gridding method can be adjusted in full accord, will greatly improve the representativeness of the flue gas of getting of whole smoke sampling system and the accuracy that Oxygen Amount in Flue Gas is measured.Simultaneously owing to having taked effectively to prevent that flying dust from entering the measure of smoke sampling rifle, also improved the reliability of whole flue gas sampling device.
Accompanying drawing explanation
Fig. 1 is existing flute type tubular type smoke sampling rifle schematic diagram;
Fig. 2 existing three is in charge of combination smoke sampling gun schematic diagram;
Fig. 3 is the anti-blocking flue gas sampling gun of current-sharing of the present utility model schematic diagram.
Wherein, 1. smoke sampling hole, 2. smoke sampling is in charge of one, and 3. smoke sampling is in charge of two, and 4. smoke sampling is in charge of three, 5. sealing socket, 6. equal discharge orifice three, 7. all discharge orifice two, 8. flue gas mixing-chamber, 9. flue gas fairlead, 10. flue tube wall, 11. smoke sampling mouths, 12. gas sampling probes.
Embodiment
Below in conjunction with accompanying drawing and embodiment, the utility model is described in further detail.
Figure 1 shows that the structural representation of flute type tubular type smoke sampling rifle, the smoke sampling hole 1 that is 2mm along the uniform a plurality of diameters of stopple coupon, externally, under suction force effect, flue gas enters smoke sampling rifle from each smoke sampling hole 1, after the end of smoke sampling rifle collects, enters flue gas analyzer.Known according to associated fluid mechanics principle, during actual sampling, smoke sampling hole 1 is the closer to sampling gun end, and in hole, negative pressure is larger, and the flue gas differential pressure inside and outside smoke sampling hole 1 is larger, and flue gas flow is also larger.The flue gas flow in the smoke sampling hole 1 of diverse location is different, and particularly smoke sampling hole 1 exhaust gas volumn of getting of sampling gun top and end exists very big deviation.Due to each smoke sampling hole 1 exhaust gas volumn difference of getting,, there is relatively large deviation between measurement result and actual oxygen level in the representative variation that it mixes oxygen level in rear flue gas.
Figure 2 shows that three are in charge of combination smoke sampling gun schematic diagram, it is welded side by side by three identical weldless steel tubes of caliber, is respectively in charge of and stretches into the smoke sampling point determining positions that the length in flue is determined by gridding method.This sampler is with respect to flute type tubular type smoke sampling rifle, although each sampling spot flue gas flow deviation reduces to some extent, because each length of tube is different, on-way resistance is naturally different, and therefore during actual smoke sampling, each manages the flue gas flow of getting is also different.Owing to being respectively in charge of got exhaust gas volumn difference, it mixes the same variation of representativeness of oxygen level in rear flue gas, between measurement result and actual oxygen level, also brings deviation.
Above two kinds of smoke sampling rifles, institute gets in flue gas and all contains a large amount of fly ash granules, and fly ash granule enters smoke sampling rifle with flue gas, can cause smoke sampling rifle to stop up.
Figure 3 shows that the anti-blocking flue gas sampling gun of current-sharing of the present utility model schematic diagram, comprising: gas sampling probe 12, sealing socket 5, equal discharge orifice, flue gas mixing-chamber 8 and flue gas fairlead 9; Described gas sampling probe 12 comprises that three different smoke samplings of length are in charge of, one end that described three smoke samplings are in charge of is fixed in described sealing socket 5, the other end that described three smoke samplings are in charge of arranges respectively smoke sampling mouth 11, smoke sampling be in charge of 23 and smoke sampling be in charge of 34 and install respectively equal discharge orifice 27 and equal discharge orifices 36 additional with the end of described sealing socket junction, described flue gas mixing-chamber 8 is connected with described gas sampling probe 12, and described flue gas mixing-chamber 8 is communicated with described flue gas fairlead 9.
The effect of smoke sampling mouth 11 is to introduce flue gas, reduces flying dust simultaneously as far as possible enter smoke sampling mouth 11 by gas solid separation effect.The effect of gas sampling probe 12 is that the flue gas of smoke sampling mouth 11 is delivered to flue gas mixing-chamber 8.The effect of sealing socket 5 is that smoke sampling rifle is played a supportive role, and is threaded and is fixed on flue tube wall simultaneously by being welded on smoke sampling barrel block on flue tube wall 10.A plurality of smoke samplings are in charge of the position being connected with described sealing socket 5 and are passed through welded seal, guarantee the sealing function of sealing socket 5.All the effect of discharge orifice is the balanced resistance of being respectively in charge of, and guarantees to be respectively in charge of exhaust gas volumn identical.The effect of flue gas mixing-chamber 8 is three smoke samplings to be in charge of to got flue gas fully mix.The effect of flue gas fairlead 9 is that mixed flue gas is introduced to flue gas analyzer.
The course of work and principle are as follows:
Smoke sampling rifle is stretched in boiler back end ductwork, by the screw thread on sealing socket 5, be fixed on the smoke sampling barrel block on flue tube wall.Due to smoke sampling be in charge of one 2 longer, can vibration in smoke gas flow, will cause stopple coupon to go out fracture from weld bond, therefore suitably lengthen sealing socket 5, three smoke samplings are in charge of by spot welding and are connected simultaneously, stopple coupon is played to the effect of reinforcing and supporting.
The flue gas that coal dust forms after stove internal combustion enters back-end ductwork, by smoke sampling mouth 11, enters smoke sampling rifle.For a large amount of flying dusts that prevent from carrying in flue gas enter sampling gun, taked following measures.First smoke sampling mouth 11 is carried out to flow path direction back to flue gas, the flying dust in flue gas just can directly not enter smoke sampling mouth 11.Smoke sampling mouth 11 is designed to special shape simultaneously.In face of flue gas, come flow path direction to have a step, the particles hit in flue gas produces on step clashes into separation, and the fly ash granule after separation can be by bounce-back away from smoke sampling mouth 11.The suction inlet of smoke sampling mouth 11 is positioned at the center of a concave shaped space, and fly ash granule is difficult to enter.By adopting said structure, can effectively reduce the flying dust amount that enters smoke sampling rifle.
Smoke gas flow is when being respectively in charge of, and due to each minute length of tube difference, on-way resistance was different, and institute's exhaust gas volumn of getting is not identical yet.For eliminating, be respectively in charge of resistance error, smoke sampling be in charge of 23 and smoke sampling be in charge of 34 and install respectively equal discharge orifice 27 and equal discharge orifices 36 additional with the end of sealing socket 5 junctions.Due to smoke sampling, be in charge of one 2 the longlyest, flue gas flow is minimum, need not install equal discharge orifice additional.All the size of discharge orifice can be calculated acquisition by resistance, and then on experiment table, aspirates test.By anemometer, measure the wind speed of each smoke sampling pieza, if there is relatively large deviation, adjust the size of equal discharge orifice, until three to be in charge of flue gas flow in full accord.Because the flue gas flow that three smoke samplings are in charge of is in full accord, greatly improved the representativeness of the flue gas of getting.Three smoke samplings are in charge of got flue gas and are fully mixed in flue gas mixing-chamber 8, by flue gas fairlead 9, enter flue gas analyzer.
Although above-mentioned, by reference to the accompanying drawings embodiment of the present utility model is described; but the not restriction to utility model protection scope; one of ordinary skill in the art should be understood that; on the basis of the technical solution of the utility model, those skilled in the art do not need to pay various modifications that creative work can make or distortion still in protection domain of the present utility model.

Claims (5)

1. the anti-blocking flue gas sampling gun of current-sharing, is characterized in that, comprising: gas sampling probe, sealing socket, equal discharge orifice, flue gas mixing-chamber and flue gas fairlead;
Described gas sampling probe comprises that the different a plurality of smoke samplings of length are in charge of, one end that described a plurality of smoke sampling is in charge of is fixed in described sealing socket, the other end that described a plurality of smoke sampling is in charge of arranges respectively smoke sampling mouth, described equal discharge orifice is arranged on described smoke sampling and is in charge of the end with described sealing socket junction, described flue gas mixing-chamber is connected with described gas sampling probe, and described flue gas mixing-chamber is communicated with described flue gas fairlead.
2. the anti-blocking flue gas sampling gun of a kind of current-sharing as claimed in claim 1, is characterized in that, the caliber that described a plurality of smoke samplings are in charge of is identical, and described a plurality of smoke samplings are in charge of the position being connected with described sealing socket and are passed through welded seal.
3. the anti-blocking flue gas sampling gun of a kind of current-sharing as claimed in claim 1, is characterized in that, described smoke sampling mouth carrys out flow path direction back to flue gas, and the mouth that enters of described smoke sampling mouth is designed to concave shaped, and the suction inlet of smoke sampling mouth is positioned at the center of concave shaped space; Described smoke sampling mouth comes flow path direction that taper table top is set over against flue gas.
4. the anti-blocking flue gas sampling gun of a kind of current-sharing as claimed in claim 1, is characterized in that, described sealing socket is fixed on the smoke sampling barrel block on flue tube wall by screw thread.
5. the anti-blocking flue gas sampling gun of a kind of current-sharing as claimed in claim 1, is characterized in that, the flue gas flow that a plurality of smoke samplings are in charge of described in the Assurance of Size of described equal discharge orifice is identical.
CN201320585806.2U 2013-09-23 2013-09-23 Flow-equalized anti-blocking flue gas sampling gun Active CN203432825U (en)

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Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103940550A (en) * 2014-04-09 2014-07-23 国家电网公司 Device for measuring air leakage of power station boiler air pre-heater
CN104075914A (en) * 2014-07-01 2014-10-01 国家电网公司 Novel smoke sampling method
CN104236957A (en) * 2014-09-18 2014-12-24 中国神华能源股份有限公司 Sampling test gun, particle sampling system and two-way measurement method for particle flow rate
CN104807680A (en) * 2015-04-23 2015-07-29 哈尔滨工程大学 Flue gas multipoint sampling device
CN105043827A (en) * 2015-07-10 2015-11-11 国家电网公司 Power station boiler flue gas sampling device
CN105223042A (en) * 2015-11-17 2016-01-06 国网山东省电力公司电力科学研究院 Fire coal boiler fume sampler
CN105466645A (en) * 2015-12-30 2016-04-06 中国华能集团清洁能源技术研究院有限公司 System and method for quickly detecting air leakage factor of boiler tail flue
CN105628880A (en) * 2016-02-04 2016-06-01 大唐环境产业集团股份有限公司 Smoke pollution treatment equipment performance detection device
CN105628455A (en) * 2016-02-04 2016-06-01 大唐环境产业集团股份有限公司 Full-size smoke component measuring device for large flue
CN105890940A (en) * 2016-06-15 2016-08-24 安徽省绿巨人环境技术有限公司 Air sampling device
CN106153406A (en) * 2016-08-31 2016-11-23 哈尔滨锅炉厂有限责任公司 Flue gas sampling device and sampling method thereof for SCR reactor
CN107238678A (en) * 2016-03-28 2017-10-10 河北农业大学 A kind of agricultural microclimate determines device
CN109556928A (en) * 2018-11-30 2019-04-02 国网山东省电力公司电力科学研究院 A kind of fly ash sampling device and its operating method and its calibration measuring method
CN109682653A (en) * 2018-12-27 2019-04-26 永清环保股份有限公司 A kind of X-shaped flue gas multidraw device

Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103940550A (en) * 2014-04-09 2014-07-23 国家电网公司 Device for measuring air leakage of power station boiler air pre-heater
CN104075914A (en) * 2014-07-01 2014-10-01 国家电网公司 Novel smoke sampling method
CN104236957A (en) * 2014-09-18 2014-12-24 中国神华能源股份有限公司 Sampling test gun, particle sampling system and two-way measurement method for particle flow rate
CN104807680B (en) * 2015-04-23 2017-06-20 哈尔滨工程大学 Flue gas multidraw device
CN104807680A (en) * 2015-04-23 2015-07-29 哈尔滨工程大学 Flue gas multipoint sampling device
CN105043827A (en) * 2015-07-10 2015-11-11 国家电网公司 Power station boiler flue gas sampling device
CN105223042B (en) * 2015-11-17 2017-08-08 国网山东省电力公司电力科学研究院 Fire coal boiler fume sampler
CN105223042A (en) * 2015-11-17 2016-01-06 国网山东省电力公司电力科学研究院 Fire coal boiler fume sampler
CN105466645A (en) * 2015-12-30 2016-04-06 中国华能集团清洁能源技术研究院有限公司 System and method for quickly detecting air leakage factor of boiler tail flue
CN105628880A (en) * 2016-02-04 2016-06-01 大唐环境产业集团股份有限公司 Smoke pollution treatment equipment performance detection device
CN105628455A (en) * 2016-02-04 2016-06-01 大唐环境产业集团股份有限公司 Full-size smoke component measuring device for large flue
CN107238678A (en) * 2016-03-28 2017-10-10 河北农业大学 A kind of agricultural microclimate determines device
CN105890940A (en) * 2016-06-15 2016-08-24 安徽省绿巨人环境技术有限公司 Air sampling device
CN106153406A (en) * 2016-08-31 2016-11-23 哈尔滨锅炉厂有限责任公司 Flue gas sampling device and sampling method thereof for SCR reactor
CN109556928A (en) * 2018-11-30 2019-04-02 国网山东省电力公司电力科学研究院 A kind of fly ash sampling device and its operating method and its calibration measuring method
CN109556928B (en) * 2018-11-30 2022-03-18 国网山东省电力公司电力科学研究院 Fly ash sampling device, operation method thereof and calibration measurement method thereof
CN109682653A (en) * 2018-12-27 2019-04-26 永清环保股份有限公司 A kind of X-shaped flue gas multidraw device

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Address after: 100031 No. 86 West Chang'an Avenue, Beijing, Xicheng District

Patentee after: STATE GRID CORPORATION OF CHINA

Patentee after: Shandong Electric Power Research Institute

Address before: No.1, 2nd Ring South Road, Shizhong District, Jinan City, Shandong Province

Patentee before: State Grid Corporation of China

Patentee before: Shandong Electric Power Research Institute

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Effective date of registration: 20220216

Address after: 100031 No. 86 West Chang'an Avenue, Beijing, Xicheng District

Patentee after: STATE GRID CORPORATION OF CHINA

Patentee after: State Grid Shandong Electric Power Company Electric Power Research Institute

Address before: 100031 No. 86 West Chang'an Avenue, Beijing, Xicheng District

Patentee before: STATE GRID CORPORATION OF CHINA

Patentee before: Shandong Electric Power Research Institute

TR01 Transfer of patent right