CN105181402A - Low-concentration smoke dust sampling device and method - Google Patents
Low-concentration smoke dust sampling device and method Download PDFInfo
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- CN105181402A CN105181402A CN201510610723.8A CN201510610723A CN105181402A CN 105181402 A CN105181402 A CN 105181402A CN 201510610723 A CN201510610723 A CN 201510610723A CN 105181402 A CN105181402 A CN 105181402A
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Abstract
The invention discloses a low-concentration smoke dust sampling device. The low-concentration smoke dust sampling device comprises a main machine, a sampling gun, a condenser and a drier. The sampling gun comprises a handle, a sampling tube, a pitot tube and a thermocouple, wherein the sampling tube, the pitot tube and the thermocouple are connected with the handle. The gas outlet end of the sampling tube is sequentially connected with the condenser, the drier and the main machine. The thermocouple and the pitot tube are connected with the main machine. A multi-stage sampling head is installed at the head of the sampling tube. A sampling nozzle is arranged at the front end of the multi-stage sampling head. The multi-stage sampling head comprises a shell and three dust collection units arranged in the shell. The dust collection units are sequentially arranged in the flowing direction of smoke. The smoke entering the sampling tube is sequentially in contact with the dust collection units, smoke dust is adsorbed by the dust collection units, and the smoke dust collecting efficiency of the device is improved. The invention further discloses a low-concentration smoke dust sampling method in which the device is adopted. By means of the low-concentration smoke dust sampling device and method, the concentration of the smoke dust is accurately measured under the low-concentration and high-humidity working condition.
Description
Technical field
The present invention relates to field of environmental protection detection, be specifically related to a kind of low-concentration smoke sampling device and method.
Background technology
Define flue dust isokinetic sampling measuring method in GB/T16157-1996 " in Concentration in Fixed Pollutants Source, particle measures and the gaseous contaminant method of sampling ", recommend the mode adopting filter cylinder to filter gather the particle in flue gas and measure its concentration.Existing smoke dust sampling apparatus and method also mostly adopt filtration method (filter cylinder or filter membrane) to gather flue dust.But what require along with Environmental Protection in China improves constantly, and existing smoke dust sampling method exists significant limitation in the low concentration tobacco damping-off taking coal-burning power plant as representative: 1) at the very low (5mg/m of dust concentration
3time below), its particle composition is based on trickle or superfine microparticle, and because existing filtering material is not high enough to its arresting efficiency, fine particle very easily along with air-flow is through filtering layer, causes test concentrations on the low side; 2) under high-humidity gas fume condition, moisture very easily condenses in smoke dust sampling system, soaks filtering material, easily causes filtering material breakage or pollutes, make test result serious distortion during long-time sampling.
Summary of the invention
An object of the present invention is to provide a kind of low-concentration smoke sampling device, realizes the Accurate Determining of dust concentration under low concentration, high humility operating mode.
To achieve these goals, the technical solution used in the present invention is: a kind of low-concentration smoke sampling device, comprise main frame, sampling gun, condenser and exsiccator, described sampling gun comprises handle, and the sampling pipe to be connected with handle, pitot tube and thermopair, the outlet side of described sampling pipe and condenser, exsiccator is connected successively with main frame, described thermopair is connected with main frame respectively with pitot tube, the head of described sampling pipe is provided with multistage sampling head, the front end of this multistage sampling head is provided with sampling mouth, described multistage sampling head comprises the unit that gathers dust of more than 3 grades arranged in housing and housing, the described unit that gather dust at different levels are arranged in order along flow of flue gas direction, the flue gas entering sampling pipe contacts with the unit that gathers dust at different levels successively, flue dust respectively gathered dust unit absorption, improve device to flue dust collecting efficiency.
The described unit that gather dust at different levels include one piece of orifice plate and one piece of collecting board, described orifice plate and collecting board are arranged in order along flue gas flow direction and have space between the two in housing, the middle part of wherein said orifice plate has multiple through hole passed through for flue gas, described collecting board wherein between dual-side and housing, there is spacing, space between described orifice plate and collecting board and the spacing between collecting board dual-side and inner walls form the flow channel of flue gas dust collection unit, described collecting board is provided with towards the one side of orifice plate the film that gathers dust, the flue dust of multistage sampling head is entered through over-sampling mouth, gathering dust on film of collecting board is sticked under inertia effect.
Described multistage sampling head has 3 grades of unit that gather dust, and the through-hole aperture of the orifice plate of these 3 grades of unit that gather dust is different, and the through-hole aperture of the orifice plate of the 1st grade of unit that gathers dust is between 2 ~ 10mm; The through-hole aperture of the 2nd grade of unit that gathers dust is between 0.2 ~ 2mm; 3rd level gathers dust the through-hole aperture of unit between 0.05 ~ 0.2mm.The distance of described orifice plate and collecting board is between 1 ~ 4mm.
The bore of described sampling mouth is no more than 8mm, and length is no more than 60mm.
Described sampling gun also comprises heating arrangement, and this heating arrangement is set in sampling pipe outside, for heating sampling gun to prevent from occurring condensate water in sampling gun.
The described film that gathers dust is that gather dust film or metal of the teflon having smeared high-temperature plastic gathers dust film.The described metal film that gathers dust comprises aluminium foil etc.
For removably connecting between described sampling mouth and multistage sampling head, for removably connecting between described multistage sampling head and sampling pipe, the sampling mouth of different size can be changed according to the flue gas flow rate in flue.
Described main frame comprises flowmeter, speed governing aspiration pump and single-chip microcomputer, described speed governing aspiration pump is connected with single-chip microcomputer, described pitot tube is connected with single-chip microcomputer, described dryer export end is connected successively with flowmeter and speed governing aspiration pump, described thermopair is connected with single-chip microcomputer, and described single-chip microcomputer controls the rotating speed of speed governing aspiration pump in real time to regulate sampling pipe intake velocity consistent with velocity of flue gas according to flue gas flow and flue-gas temperature.
Described single-chip microcomputer possesses collection, calculating, output, feedback control function, can according to flue gas flow rate situation of change, adjustment aspiration pump rotating speed and flow in real time, and records the integrated flux in test process.
Two of object of the present invention is to provide a kind of low-concentration smoke sampling method utilizing above-mentioned low-concentration smoke sampling device.
To achieve these goals, the technical solution used in the present invention is: a kind of low-concentration smoke sampling method utilizing above-mentioned low-concentration smoke sampling device, comprises the following steps:
(1) film that gathers dust having smeared high-temperature plastic is installed on the collecting board of the unit that gather dust at different levels of described multistage sampling head;
(2) predict flue gas flow rate, sampling gun is installed to the sampling mouth of suitable bore;
(3) start the heating arrangement of sampling gun to heat sampling gun, the sampling mouth entrance of sampling gun is met airflow direction and be placed in flue cross section and test;
(4), after having tested, utilize the weightening finish sum of the film that gathers dust divided by the accumulation gas production of speed governing aspiration pump, the average smoke concentration of test period can be drawn.
In described step (4), the heating-up temperature of sampling gun heating arrangement is not less than 180
o, in sampling process, can not condensate water be there is in C; The ability of speed governing aspiration pump is that extraction flow is not less than 50L/min, negative pressure is not less than-50kPa.
In described step (4), the accumulation gas production of each test is not less than 1.5m
3(standard state).
The invention has the advantages that: low-concentration smoke sampling device of the present invention arranges the multistage sampling head with the unit that gathers dust of more than 3 grades, the collecting board of unit of gathering dust is provided with the film that gathers dust, gather flue dust in the mode that multistage inertial impaction adheres to, avoid the problem that traditional filtering mode is low to fine particulates collecting efficiency, resistance is large.Support the use tough and tensile, the closely knit film that gathers dust that traditional filtering mode cannot adopt, not cracky or generation mass loss in use procedure, also not easily contaminated, test result is true and reliable.Can multistage sampling head be placed in flue in sampling process, significantly shorten the length of its front-end sampling mouth, avoid the deposition of flue dust in the preceding pipeline of multistage sampling head to greatest extent.Sampling gun adopts the high-power heating design of whole body, avoids the condensation of moisture in flue gas and the wetting of the film that gathers dust and corrodes.Therefore, described device and method can meet the test request of dust concentration under low concentration, high humility operating mode well.
Accompanying drawing explanation
Fig. 1 is the structural representation of low-concentration smoke sampling device of the present invention;
Fig. 2 is sampling gun partial structurtes schematic diagram;
Fig. 3 to gather dust schematic diagram for the unit that gathers dust.
1. sampling gun, 2. signal wire, 3. mainframe box (containing flowmeter, speed governing aspiration pump and single-chip microcomputer), 4. connecting pipe, 5. exhaust tube, 6. exsiccator, 7. condenser, 8. sample mouth, 9. multistage sampling head, 10. thermopair, 11.S type pitot tube, 12. sampling pipes, 91. orifice plates, 92. collecting boaries, 93. gather dust film, 94. housings, 95. joints.
Embodiment
embodiment one
Low-concentration smoke sampling device is as shown in Figure 1 one embodiment of the present of invention, is made up of sampling gun 1, condenser 7, exsiccator 6 and main frame 3.Main frame 3 is made up of mainframe box, flowmeter, speed governing aspiration pump and the integrated assembling of single-chip microcomputer, and flowmeter is connected with single-chip microcomputer successively with speed governing aspiration pump.Sampling gun 1 comprises handle, sampling pipe 12, the multistage sampling head 9 being arranged on sampling pipe head, the sampling mouth 8 being connected to multistage sampling head front end, S type pitot tube 11 and thermopair 10.Sampling pipe 12, S type pitot tube 11 are all connected with handle with thermopair 10.Condenser 7 and exsiccator 6 are arranged between the outlet side of sampling pipe and flowmeter, prevent flow from taking into account the parts such as speed governing aspiration pump and are corroded.Condenser 7 one end is connected by exhaust tube 5 with sampling pipe 12, and the other end is connected by flue gas flexible pipe with exsiccator 6.Exsiccator 6 other end is connected with flowmeter by flue gas flexible pipe, and the other end of flowmeter is connected by flue gas flexible pipe with speed governing aspiration pump.S type pitot tube 11 is connected with single-chip microcomputer by connecting pipe 4, and thermopair 10 is connected with single-chip microcomputer by signal wire 2.Single-chip microcomputer controls the rotating speed of speed governing aspiration pump in real time to regulate sampling pipe intake velocity consistent with velocity of flue gas according to flue gas flow and flue-gas temperature.
Multistage sampling head 9 comprises housing 94, and housing 94 afterbody is provided with the joint 95 removably connected with sampling pipe 12 head, is connected by multistage sampling head 9 by this joint 95 with sampling pipe 12.Housing 94 inside arranges 3 grades of unit that gather dust, and 3 grades of unit that gather dust are arranged in order along flue gas flow direction.The unit that gathers dust at different levels comprises one piece of orifice plate 91 and one piece of collecting board 92, its aperture plate 91 and collecting board 92 are arranged in order along flue gas flow direction and have space between the two in housing 94, the middle part of its aperture plate 92 has multiple through hole passed through for flue gas, have spacing between the wherein dual-side of collecting board 92 and housing 94, the space between orifice plate 91 and collecting board 92 and the spacing between collecting board 92 dual-side and housing 94 inwall form the flow channel of flue gas dust collection unit.Collecting board 92 is provided with towards the side of orifice plate the film 93 that gathers dust, and this film 93 that gathers dust to gather dust film for gather dust film or aluminium foil of the teflon smearing high-temperature plastic.When the flue dust that over-sampling mouth enters multistage sampling head 9 enters the flow channel of the unit that gathers dust by the through hole of orifice plate 91, under inertia effect, stick to gathering dust on film 93 of collecting board.The flue gas entering sampling pipe 12 contacts with the unit that gathers dust at different levels successively, and flue dust sticks to and gathers dust on film, makes multistage sampling head 9 energy highly effective gathering flue dust.The through-hole aperture of each orifice plate 91 of 3 grades of unit that gather dust is different, and the through-hole aperture of the orifice plate of the 1st grade of unit that gathers dust is between 2 ~ 10mm; The through-hole aperture of the orifice plate of the 2nd grade of unit that gathers dust is between 0.2 ~ 2mm; 3rd level gathers dust the through-hole aperture of orifice plate of unit between 0.05 ~ 0.2mm; The distance of orifice plate 91 and collecting board 92 is between 1 ~ 4mm.Sampling mouth 8 bore is no more than 8mm, and length is no more than 60mm, and it is removably connected with multistage sampling head, according to the flue gas flow rate in flue and temperature, can change the sampling mouth of different size.。
Sampling gun 1 also comprises heating arrangement, and this heating arrangement is that heating tape is set in sampling pipe 12 outside, for heating sampling gun 1 to prevent from occurring condensate water in sampling gun 1.Single-chip microcomputer possesses collection, calculating, output, feedback control function, can according to flue gas flow rate situation of change, adjustment speed governing aspiration pump rotating speed and flow in real time, and records the integrated flux in test process.
embodiment two
Utilize the smoke dust sampling method of the low-concentration smoke sampling device of embodiment one, comprise the following steps:
(1) collecting board of the unit that gather dust at different levels of multistage sampling head 9 is installed the film that gathers dust having smeared high-temperature plastic;
(2) predict flue gas flow rate, sampling gun 1 is installed to the sampling mouth 8 of suitable bore;
(3) in single-chip microcomputer, input the parameter such as humidity and oxygen level of atmospheric pressure, sampled point number, tested flue gas;
(4) heat sampling gun 1, heating arrangement adopts high-power heating, and heating-up temperature is not less than 180
o, can not there is condensate water in sampling pipe 12 in sampling process in C, sampling gun 1 is placed in flue cross section is tested by meeting airflow direction.During test, single-chip microcomputer will by data such as sampling outspoken footpath, flue-gas temperature, total head, static pressure, real-time rotating speed and the flow controlling adjustment speed governing aspiration pump, the ability of aspiration pump is that extraction flow is not less than 50L/min, negative pressure is not less than-50kPa, ensure that sampling mouth induction air flow ratio is consistent with flue gas flow rate, and recording instantaneous delivery value and accumulation gas production, the accumulation gas production of each test is not less than 1m
3(standard state).
(5), after having tested, utilize the weightening finish sum of the film that gathers dust divided by the accumulation gas production of speed governing aspiration pump, the average smoke concentration of test period can be drawn.
Certain coal-burning power plant's wet electrical dust precipitator outlet (low dust concentration, high humility) flue sectional area is 28.16m
2, recording its flue-gas temperature is 52
oc, oxygen level is 5.9%, and water capacity is 12%, and mean flow rate is 8.7m/s, adopts above-mentioned low-concentration smoke sampling device and method to carry out twice dust concentration test to it.Double sampling collects flue dust 4.6mg and 3.5mg respectively, and corresponding gas production is respectively 1.158m
3and 1.141m
3, calculate dust concentration and be respectively 3.95mg/Nm
3(6%O
2) and 3.05mg/Nm
3(6%O
2), average smoke concentration is 3.50mg/Nm
3(6%O
2).
Claims (10)
1. a low-concentration smoke sampling device, comprise main frame, sampling gun, condenser and exsiccator, described sampling gun comprises handle, and the sampling pipe to be connected with handle, pitot tube and thermopair, the outlet side of described sampling pipe and condenser, exsiccator is connected successively with main frame, described thermopair is connected with main frame respectively with pitot tube, it is characterized in that, the head of described sampling pipe is provided with multistage sampling head, the front end of multistage sampling head is provided with sampling mouth, described multistage sampling head comprises the unit that gathers dust of more than 3 grades arranged in housing and housing, the described unit that gather dust at different levels are arranged in order along flow of flue gas direction, the flue gas entering sampling pipe contacts with the unit that gathers dust at different levels successively, flue dust respectively gathered dust unit absorption, improve device to flue dust collecting efficiency.
2. low-concentration smoke sampling device according to claim 1, it is characterized in that, the described unit that gather dust at different levels include one piece of orifice plate and one piece of collecting board, described orifice plate and collecting board are arranged in order along flue gas flow direction and have space between the two in housing, the middle part of wherein said orifice plate has multiple through hole passed through for flue gas, described collecting board wherein between dual-side and housing, there is spacing, space between described orifice plate and collecting board and the spacing between collecting board dual-side and inner walls form the flow channel of flue gas dust collection unit, described collecting board is provided with towards the one side of orifice plate the film that gathers dust, the flue dust of multistage sampling head is entered through over-sampling mouth, gathering dust on film of collecting board is sticked under inertia effect.
3. low-concentration smoke sampling device according to claim 2, is characterized in that, described in the film that gathers dust be that gather dust film or metal of the teflon having smeared high-temperature plastic gathers dust film.
4. low-concentration smoke sampling device according to claim 3, is characterized in that, described multistage sampling head has 3 grades of unit that gather dust.
5. low-concentration smoke sampling device according to claim 4, is characterized in that, the through-hole aperture of the orifice plate of described 3 grades of unit that gather dust is different, and the aperture of the through hole orifice plate of the 1st grade of unit that gathers dust is between 2 ~ 10mm; The through-hole aperture of the 2nd grade of unit that gathers dust is between 0.2 ~ 2mm; 3rd level gathers dust the through-hole aperture of unit between 0.05 ~ 0.2mm; The orifice plate of the unit that gathers dust at different levels and the distance of collecting board are between 1 ~ 4mm; The bore of described sampling mouth is no more than 8mm, and length is no more than 60mm.
6. low-concentration smoke sampling device according to claim 5, is characterized in that, described sampling mouth and multistage sampling head removably connect, and described multistage sampling head and sampling pipe removably connect.
7. low-concentration smoke sampling device according to claim 6, is characterized in that, described sampling gun also comprises heating arrangement, and this heating arrangement is set in sampling pipe outside, for heating sampling gun to prevent from occurring condensate water in sampling gun.
8. low-concentration smoke sampling device according to claim 7, it is characterized in that, described main frame comprises flowmeter, speed governing aspiration pump and single-chip microcomputer, described speed governing aspiration pump is connected with single-chip microcomputer, described pitot tube is connected with single-chip microcomputer, described dryer export end is connected successively with flowmeter and speed governing aspiration pump, described thermopair is connected with single-chip microcomputer, and described single-chip microcomputer controls the rotating speed of speed governing aspiration pump in real time to regulate sampling pipe intake velocity consistent with velocity of flue gas according to flue gas flow and flue-gas temperature.
9. utilize a low-concentration smoke sampling method for the low-concentration smoke sampling device of any one of claim 1-8, comprise the following steps:
(1) film that gathers dust having smeared high-temperature plastic is installed on the collecting board of the unit that gather dust at different levels of described multistage sampling head;
(2) predict flue gas flow rate, sampling gun is installed to the sampling mouth of suitable bore;
(3) start the heating arrangement of sampling gun to heat sampling gun, the sampling mouth entrance of sampling gun is met airflow direction and be placed in flue cross section and test;
(4), after having tested, utilize the weightening finish sum of the film that gathers dust divided by the accumulation gas production of speed governing aspiration pump, the average smoke concentration of test period can be drawn.
10. low-concentration smoke sampling method according to claim 9, is characterized in that, in described step (4), the heating-up temperature of sampling gun heating arrangement is not less than 180
o, in sampling process, can not condensate water be there is in C; The ability of speed governing aspiration pump is that extraction flow is not less than 50L/min, negative pressure is not less than-50kPa; In described step (4), the accumulation gas production of each test is not less than 1.5m
3(standard state).
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| CN105466735A (en) * | 2015-12-31 | 2016-04-06 | 东方电气集团东方锅炉股份有限公司 | Smoke dust sampling and testing method applied to high-moisture-content low-dust-content system |
| CN105675158A (en) * | 2016-01-06 | 2016-06-15 | 南京航空航天大学 | Device and method for simultaneously measuring gas turbine combustion chamber outlet temperature and combustion product concentration |
| CN105806770A (en) * | 2016-04-29 | 2016-07-27 | 河南省日立信股份有限公司 | Instrument testing device capable of generating high temperature and high humidity |
| CN106289847A (en) * | 2016-09-18 | 2017-01-04 | 江苏省环境科学研究院 | A kind of performance testing device of wet type electrostatic precipitator |
| CN106323701A (en) * | 2016-08-31 | 2017-01-11 | 广东恒定检测技术有限公司 | Organic waste gas sampling instrument and organic waste gas sampling method |
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| CN107255580A (en) * | 2017-04-26 | 2017-10-17 | 浙江菲达环保科技股份有限公司 | A kind of PM2.5 particles sampling apparatus |
| CN107966332A (en) * | 2017-11-21 | 2018-04-27 | 宇星科技发展(深圳)有限公司 | Particulate matter detection means and its circuit |
| CN108693090A (en) * | 2018-06-01 | 2018-10-23 | 浙江大学 | A kind of granule density measuring device for high temperature oil-containing dusty gas |
| CN109060461A (en) * | 2018-08-30 | 2018-12-21 | 安徽省佳逸环保科技有限公司 | A kind of anti-clogging smoke dust sampling tube assembly |
| CN110196176A (en) * | 2018-02-26 | 2019-09-03 | 青岛恒远科技发展有限公司 | A kind of high-temperature high dust dioxin sampling apparatus |
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| CN105675158A (en) * | 2016-01-06 | 2016-06-15 | 南京航空航天大学 | Device and method for simultaneously measuring gas turbine combustion chamber outlet temperature and combustion product concentration |
| CN105806770B (en) * | 2016-04-29 | 2018-07-24 | 河南省日立信股份有限公司 | A kind of instrument experimental rig that high temperature and humidity occurs |
| CN105806770A (en) * | 2016-04-29 | 2016-07-27 | 河南省日立信股份有限公司 | Instrument testing device capable of generating high temperature and high humidity |
| CN106323701A (en) * | 2016-08-31 | 2017-01-11 | 广东恒定检测技术有限公司 | Organic waste gas sampling instrument and organic waste gas sampling method |
| CN106289847A (en) * | 2016-09-18 | 2017-01-04 | 江苏省环境科学研究院 | A kind of performance testing device of wet type electrostatic precipitator |
| CN106813952A (en) * | 2017-01-23 | 2017-06-09 | 浙江菲达环保科技股份有限公司 | A kind of integrated form PM2.5 sampling guns |
| CN107255580A (en) * | 2017-04-26 | 2017-10-17 | 浙江菲达环保科技股份有限公司 | A kind of PM2.5 particles sampling apparatus |
| CN107179220A (en) * | 2017-06-06 | 2017-09-19 | 苏州西热节能环保技术有限公司 | A kind of multistage filtering continuous sampling system and method for gas pollutant |
| CN107966332A (en) * | 2017-11-21 | 2018-04-27 | 宇星科技发展(深圳)有限公司 | Particulate matter detection means and its circuit |
| CN110196176A (en) * | 2018-02-26 | 2019-09-03 | 青岛恒远科技发展有限公司 | A kind of high-temperature high dust dioxin sampling apparatus |
| CN108693090A (en) * | 2018-06-01 | 2018-10-23 | 浙江大学 | A kind of granule density measuring device for high temperature oil-containing dusty gas |
| CN109060461A (en) * | 2018-08-30 | 2018-12-21 | 安徽省佳逸环保科技有限公司 | A kind of anti-clogging smoke dust sampling tube assembly |
| CN109060461B (en) * | 2018-08-30 | 2023-09-08 | 安徽省佳逸环保科技有限公司 | Anti-blocking smoke sampling tube assembly |
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Application publication date: 20151223 |