CN108507918A - Minimum discharge flue gas particles concentration on-line monitoring device and method - Google Patents
Minimum discharge flue gas particles concentration on-line monitoring device and method Download PDFInfo
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- CN108507918A CN108507918A CN201810616906.4A CN201810616906A CN108507918A CN 108507918 A CN108507918 A CN 108507918A CN 201810616906 A CN201810616906 A CN 201810616906A CN 108507918 A CN108507918 A CN 108507918A
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- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 title claims abstract description 88
- 239000003546 flue gas Substances 0.000 title claims abstract description 88
- 238000000034 method Methods 0.000 title claims abstract description 74
- 239000002245 particle Substances 0.000 title claims abstract description 31
- 238000012806 monitoring device Methods 0.000 title claims abstract description 15
- 238000005070 sampling Methods 0.000 claims abstract description 74
- 238000005259 measurement Methods 0.000 claims abstract description 59
- 239000000428 dust Substances 0.000 claims abstract description 37
- 239000003500 flue dust Substances 0.000 claims abstract description 35
- 239000007789 gas Substances 0.000 claims abstract description 27
- 239000012528 membrane Substances 0.000 claims abstract description 24
- 238000012544 monitoring process Methods 0.000 claims abstract description 17
- 238000010438 heat treatment Methods 0.000 claims abstract description 16
- 238000005303 weighing Methods 0.000 claims abstract description 15
- 239000000779 smoke Substances 0.000 claims abstract description 11
- 239000004071 soot Substances 0.000 claims description 24
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 13
- 229910052760 oxygen Inorganic materials 0.000 claims description 13
- 239000001301 oxygen Substances 0.000 claims description 13
- 238000010926 purge Methods 0.000 claims description 8
- 238000009833 condensation Methods 0.000 claims description 5
- 230000005494 condensation Effects 0.000 claims description 5
- 230000008569 process Effects 0.000 claims description 4
- 230000001105 regulatory effect Effects 0.000 claims description 4
- 238000003860 storage Methods 0.000 claims description 4
- 230000001276 controlling effect Effects 0.000 claims description 3
- 238000009434 installation Methods 0.000 claims description 3
- 238000010408 sweeping Methods 0.000 claims description 3
- 235000019504 cigarettes Nutrition 0.000 claims 1
- 238000011065 in-situ storage Methods 0.000 abstract description 10
- 238000000605 extraction Methods 0.000 abstract description 6
- 239000000203 mixture Substances 0.000 abstract description 5
- 239000006096 absorbing agent Substances 0.000 abstract description 4
- 238000005516 engineering process Methods 0.000 abstract description 4
- 230000005540 biological transmission Effects 0.000 abstract description 3
- 230000007613 environmental effect Effects 0.000 abstract description 3
- 230000003189 isokinetic effect Effects 0.000 abstract description 3
- 238000001514 detection method Methods 0.000 abstract description 2
- 238000012546 transfer Methods 0.000 abstract description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 13
- 238000013016 damping Methods 0.000 description 9
- 238000001035 drying Methods 0.000 description 6
- 230000003287 optical effect Effects 0.000 description 6
- 230000035939 shock Effects 0.000 description 5
- 238000009826 distribution Methods 0.000 description 4
- PNEYBMLMFCGWSK-UHFFFAOYSA-N Alumina Chemical compound [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 3
- 238000000149 argon plasma sintering Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 230000000116 mitigating effect Effects 0.000 description 3
- 239000004677 Nylon Substances 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- MCMNRKCIXSYSNV-UHFFFAOYSA-N Zirconium dioxide Chemical compound O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 2
- OSGAYBCDTDRGGQ-UHFFFAOYSA-L calcium sulfate Chemical compound [Ca+2].[O-]S([O-])(=O)=O OSGAYBCDTDRGGQ-UHFFFAOYSA-L 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 238000000691 measurement method Methods 0.000 description 2
- 229920001778 nylon Polymers 0.000 description 2
- 238000005086 pumping Methods 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 238000004062 sedimentation Methods 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 230000005250 beta ray Effects 0.000 description 1
- 238000009530 blood pressure measurement Methods 0.000 description 1
- 238000009529 body temperature measurement Methods 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 238000000205 computational method Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000006477 desulfuration reaction Methods 0.000 description 1
- 230000023556 desulfurization Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010790 dilution Methods 0.000 description 1
- 239000012895 dilution Substances 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000002848 electrochemical method Methods 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000005213 imbibition Methods 0.000 description 1
- 230000010365 information processing Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 239000013618 particulate matter Substances 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 230000009897 systematic effect Effects 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 238000009736 wetting Methods 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
- G01N15/06—Investigating concentration of particle suspensions
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/02—Devices for withdrawing samples
- G01N1/22—Devices for withdrawing samples in the gaseous state
- G01N1/24—Suction devices
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/34—Purifying; Cleaning
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/42—Low-temperature sample treatment, e.g. cryofixation
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N5/00—Analysing materials by weighing, e.g. weighing small particles separated from a gas or liquid
- G01N5/02—Analysing materials by weighing, e.g. weighing small particles separated from a gas or liquid by absorbing or adsorbing components of a material and determining change of weight of the adsorbent, e.g. determining moisture content
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
- G01N15/06—Investigating concentration of particle suspensions
- G01N2015/0662—Comparing before/after passage through filter
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
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- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Biochemistry (AREA)
- Physics & Mathematics (AREA)
- Analytical Chemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Engineering & Computer Science (AREA)
- Biomedical Technology (AREA)
- Molecular Biology (AREA)
- Dispersion Chemistry (AREA)
- Sampling And Sample Adjustment (AREA)
Abstract
The invention belongs to environmental monitoring technology fields, and in particular to a kind of minimum discharge flue gas particles concentration on-line monitoring device and method；Mainly by big flow In Situ Heating tracking sampling system, heat tracing transfer conduit, dust concentration flue dust rapid measurement device, gravimetric method smoke catching and weighing device, condenser system, flue gas effective discharge measuring system, extraction and gas supply system, the compositions such as instrument and control system, three-level vibration absorber；Using big flow In Situ Heating isokinetic sampling, high temperature heat tracing transmission, gravimetric method measures dirt weight, and hot-air dries the methods of filter membrane, and high certainty of measurement is simple in structure, being capable of particle concentration value in online accurate measurements flue gas；Device can effectively eliminate the influence that the moisture in flue gas detects particle concentration, being capable of continuous, online, accurate detection flue gas particles concentration value.The device is suitable for the occasion of the industrial discharges flue dust such as firepower electrical plant.
Description
Technical field
The invention belongs to environmental monitoring technology fields, and in particular to a kind of minimum discharge flue gas particles concentration on-line monitoring
Device and method.
Background technology
The method of monitoring smoke dust generally speaking divides gravimetric method and non-weight（It is equivalent）Method.Non- weight（It is equivalent）Method.It penetrates again
Collimation method, optical method, a variety of methods such as electrostatic method.
Non- weight（It is equivalent）Method mostly has the features such as simple in structure, to meet the requirement continuously monitored, but all non-weight
（It is equivalent）Method all has the characteristics that traceability is bad, it is difficult to meet the requirement of supervision/supervision monitoring.
Filter membrane weight method is national standard analysis method, is suitable as meeting supervision/supervision monitoring.But current filter membrane is weighed
Method is all to use the sample mode manually trapped, complicated for operation, is not easy to realize automatic continuous monitoring.
With the implementation of minimum discharge, the demand of accurate On-line monitor/supervision monitoring of dust concentration is increasingly urgent to, due to
It is related to supervision/supervision monitoring, it is necessary to have traceability is good, meets the requirement of transmission of quantity value, is based on these requirements, preferred method
Should be based on gravimetric method.
Sampling in flue can be divided into, be sampled outside flue by carrying out dust concentration monitoring again based on gravimetric method.Sampling in flue
By specifically sample rob directly in flue complete flue gas particles intercept and capture to the process of filter membrane, need to dry filter membrane before sampling
It does, weigh, then mark, preserve, still needed to after sampling by the drying of dust-laden filter membrane, weighed, then seeking difference, the sampling time can be obtained in it
Interior dust quantity.This method sampling precision and confidence level are higher, but due to bad environments in flue, can not place the instrument of measurement
Equipment, therefore, the method sampled in flue cannot achieve automation measurement of soot and dust concentration.Generally, based on the flue gas of gravimetric method
Particle concentration online auto monitoring system can only use the method sampled outside flue.
Be intended to realize the flue gas particles concentration online auto monitoring sampled outside the flue based on gravimetric method, should at least solve with
Lower problem：
With reliable and stable, continuous type sampling, weighing device.
It can continuously controllable carry out flue gas extraction.
Solve influence of the humidity of flue gas to measurement.
Solve sedimentation of the flue gas particles on sampling tube wall.
Combined according to National Development and Reform Committee, Bureau of Energy, Chinese Ministry of Environmental Protection and is printed and distributed《Coal electricity energy-saving and emission-reduction upgrade and transformation action plan》
The requirement of ([2014] No. 2093), it is indicated that want low to soot emissions limit value in the year two thousand twenty active service Thermal generation unit atmosphere pollution
In 5mg/Nm（Minimum discharge）.If the traditional personal monitoring's sampling of installation, sampling flow are generally 20-50 and rise/point (1.2-
3M3/ hours), it is calculated by dust concentration 5mg/Nm, if the sampling time is set as 30 points, the dust quantity that filter membrane is intercepted and captured only has 3-7.5mg,
This for empty film weight 1g or so, the bearing structure 20-30g of film, humiture variation big in vibration greatly, electromagnetic interference it is serious
On-site on-line measurement for, have bigger difficulty.Its method one solved is the support mechanism of design specialized, second is that increasing
Sampling flow.
According to the requirement of minimum discharge, SO2 concentration of emissions are less than 35mg/m3.In order to reach this to require, generally need wet
Method desulfurization, this causes humidity of flue gas larger, and the flue gas of some power plant is even in oversaturated state.Humidity is larger to various
The method of monitoring smoke dust all causes influence, and to the light scattering method generally used at present, steam can cause the scattering of light larger
Influence, to influence measure accuracy, to gravimetric method, influence of the water capacity to measurement includes：
Absorption of the filter membrane to water.Filter membrane usually forms micropore together by fiber interweaving, usually has stronger water imbibition factually
It tests, the filter membrane water absorption of a 90mm can reach the magnitude of g.Under flue gas condition, the hygroscopic capacity of film with flue gas humidity
Variation.In artificial sample, this disturbing factor of the hygroscopic capacity of film can be by all carrying out drying solution, online certainly before and after weighing
It is dynamic when weighing, it is necessary to use other measure.
The dissolving of water-soluble dirt.Calcium sulfate in power plant's flue dust, silica, aluminium oxide etc. have certain water solubility.
When the steam of flue dust is in saturation state, water droplet precipitation is had, these water droplets can dissolve part aqueous dirt, work as the sampling time
Longer, in the case that water is with complete wetting film, these water-soluble dirt can penetrate filter membrane with water droplet, cause measurement error.It is this
It influences, its temperature can only be made higher than the water-vapo(u)r saturation temperature under corresponding pressure by heating flue gas.
Dust concentration about minimum discharge monitors, and there are many methods at present, such as：Chinese invention patent《It measures super
The particle diameter distribution of low concentration flue dust and the device and method of mass concentration》, which uses optical method, and what emphasis solved asks
Topic " has been greatly reduced in existing average grain diameter measurement method due to replacing particle diameter distribution to bring with Sauter mean diameter
Systematic error, while decreasing in average grain diameter measurement method since delustring deviation makes the Sauter mean diameter decided
Generate uncertain deviation and caused by result be distorted "
Chinese invention patent " a kind of super low concentration wet flue gas flue dust on-line measurement device and its On-line Measuring Method " discloses one
The device and method of measurement of soot and dust concentration under kind minimum discharge, the method used is optical method.Its key problems-solving is
" sample gas successively by condensation flue gas measuring unit and dry flue gas optical measurement unit, dust concentration is divided into two parts and is measured,
Can quantify the smoke content and dry flue gas analyzed in saturated steam and droplet in smoke content, so as to deeper into
Study the distribution situation of flue dust.”
Chinese invention patent " a kind of sampling with weigh integral type β ray flue dust quality weighing instrument " discloses under a kind of minimum discharge
The device and method of measurement of soot and dust concentration, the method used is ray method.
Chinese invention patent " a kind of equipment of smoke dust sampling and the computational methods of dust concentration " discloses a kind of ultralow row
The device and method for putting down measurement of soot and dust concentration, according to its description, it may be that use electrostatic method.
Chinese invention patent " a kind of wet flue gas on-line monitoring system " discloses a kind of measurement for wet flue gas particulate matter
System, the measuring principle which uses is light scattering method, and for wet flue gas, which uses the clean flue gas dilution of high temperature
Method.
Invention content
The present invention is that smoke content is low in the case of solving to be directed to minimum discharge, and smoke moisture is big, and flue gas particles are sampling
Sedimentation on tube wall leads to the technical problem of monitoring smoke dust result inaccuracy, provides a kind of minimum discharge flue gas particles concentration and exists
Line monitoring device.
In order to solve the above technical problems, the technical solution adopted in the present invention is：A kind of minimum discharge flue gas particles are dense
On-Line Monitor Device is spent, including the sampling being placed in flue is robbed, heater is equipped in sampling gun, the sampling, which is robbed, passes through heat tracing pipe
Line is connected with flue dust rapid measurement device, samples and is connected with shut-off valve on the heat traced pipeline robbed between flue dust rapid measurement device
The outlet side of S1, the flue dust rapid measurement device are also associated with the measurement of soot and dust concentration device based on gravimetric method by pipeline,
The outlet side of the measurement of soot and dust concentration device is also sequentially serially connected with first order condenser, second level condenser, aspiration pump, filtering
Device；The aspiration pump is also associated with the frequency converter for controlling its work, and the outlet side of the filter also passes through pipeline respectively
It is connected with air accumulator and accurate filter；Shut-off valve S4, filter are connected on pipeline between the filter and air accumulator
Shut-off valve S5 is connected on pipeline between accurate filter；It is being closed by piping connection the outlet side of the accurate filter
On disconnected heat traced pipeline between valve S1 and flue dust rapid measurement device, shutdown is connected on the pipeline of the outlet side of accurate filter
Valve S3；The outlet side of the air accumulator is robbed in sampling on the heat traced pipeline between shut-off valve S1 by piping connection, air accumulator
Outlet side pipeline on be connected with shut-off valve S2；The air accumulator is also associated with by pressure regulating valve, and the heater, flue dust are quick
Measuring device, measurement of soot and dust concentration device, shut-off valve S1-S5, aspiration pump, frequency converter are connected with controller jointly.
The operation principle of above-mentioned apparatus is：The sampling of the mode of big flow In Situ Heating is used in flue gas sampling part
It robs, flue gas sampling flow is more than 100 liters/min, and the part that flue gas sampling is got the jump in flue includes high-power heater, it is ensured that stream
Go out the flue-gas temperature that sampling is robbed and is more than 120 DEG C of heaters by main controller controls.The flue gas that outflow sampling is robbed uses heat traced pipeline
The power of conveying, heat traced pipeline is not less than 100W, and flue gas concentration measuring uses flue dust rapid measurement device, which can be used
The device that the various satisfactions such as optical method, electrostatic method quickly continuously measure, measuring signal send master controller.Flue dust rapid measurement device
Measurement of soot and dust concentration device based on gravimetric method is set later, which is less than 30 points in the sampling interval, and inlet flow rate is less than 100
Liter/min when precision should be better than 0.1mg.It completes the flue gas after measuring and uses condensed in two stages, first order condenser and air heat-exchange
Natural cooling, second level condenser are to force to cool down, and device is by aspiration pump as the power for extracting flue gas, the preferred blade of aspiration pump
Pump, by Frequency Converter Control, control instruction is sent out the rotating speed of pump by master controller, and the foundation of control is the sampling mouth for ensureing sampling and robbing
The flow velocity of entrance is identical as the flue gas flow rate in flue.Aspiration pump exit gas is divided into two-way after filter, all the way through reaching a standard
Disconnected valve S4 enters air accumulator, enters accurate filter by shut-off valve S5 all the way.Air accumulator is used and is maintained automatically by pressure regulating valve
Pressure inside the tank；Gas into air accumulator is used for blowback.Gas into accurate filter is carried with for measurement of soot and dust concentration device
It is dried for filter membrane for cleaned air.
Further, the positive pressure transmitter PT101 of flue gas pressures that interior setting measures windward side in flue is robbed in sampling, for surveying
Measure the negative pressure transmitter PT102 of the flue gas pressures of leeward in flue, the temperature transmitter for measuring temperature in flue
TT101, temperature controller TIC102；The output of all transmitters and temperature controller is sent to controller.
Further, the sampling robs to be provided between outlet and shut-off valve S1 and is respectively used to measure the flue gas temperature after heating
The temperature transmitter TT102 of degree, humidity, oxygen content, humidity transmitter MT101, oxygen content transducer AT101, all transmitters
Output is sent to controller 14.
Further, the smoke outlet of heat traced pipeline is provided with temperature transmitter TT103, temperature controller TIC103,
Flow transmitter FT101, all transmitters and controller are sent to controller.
Further, outlet end installation oxygen content transducer AT201, the temperature transmitter TT201 of the second level condenser,
Pressure transmitter PT201, flowmeter FT201, all transmitters and flowmeter are sent to controller.
Further, the air accumulator is also associated with safety valve.For ensureing that air accumulator is safe, pressure inside the tank is safety valve
5-8kg。
Another object of the present invention, provides a kind of minimum discharge flue gas particles concentration on-line monitoring method, and use is above-mentioned
Device realize, include the following steps：
Flue gas sampling flow is：1-S1 openings/S2 is robbed in flue gas-sampling, S3 closings, and-heat tracing transmission-quickly measure-is based on
Gravimetric method measurement-condensation-aspiration pump constant speed tracking-S4 openings/S5 closings-air accumulator 11；
Controller controls the tracking of aspiration pump constant speed, flue gas is sampled rob it is dense to flue dust rapid measurement device and flue dust through heat traced pipeline
After spending measuring device, and weighing results are sent to controller, flue gas is condensed by first order condenser and second level condenser
Enter air accumulator by S, the gas into air accumulator is used for blowback, that is, carries out pipeline purging；
Pipeline sweeping process is：Aspiration pump full speed running-S4 openings/S5 closings-11-S2 of air accumulator openings/S1, S3 are closed
It close-samples and robs-flue；
Controller controls aspiration pump full speed running, and the gas in air accumulator enters through S2 in flue, carries out flue path purging；
Filter membrane dries flow：Aspiration pump Half Speed operation-S5 openings/S4 closing-accurate filter-S3 openings/S1, S2 are closed
Close-quickly measure-it is based on gravimetric method measurement-condensation-aspiration pump；
When S5 openings/S4 is closed, the gas flowed out from filter enters accurate filter, is then dust concentration using S3
Measuring device provides cleaned air and is dried for filter membrane.
Compared with prior art the invention has the advantages that：
Using big flow In Situ Heating isokinetic sampling, the transmission of high temperature heat tracing, gravimetric method measures dirt weight, and hot-air dries the side such as filter membrane
Method, high certainty of measurement is simple in structure, being capable of particle concentration value in online accurate measurements flue gas.Device can effectively eliminate
The influence that moisture in flue gas detects particle concentration, being capable of continuous, online, accurate detection flue gas particles concentration value.It should
Device is suitable for the occasion of the industrial discharges flue dust such as firepower electrical plant.
Description of the drawings
Fig. 1 is the schematic diagram of minimum discharge flue gas particles concentration on-line monitoring device of the present invention.
Fig. 2 is three-level shock mitigation system schematic diagram.
Fig. 3 is the structural schematic diagram of measurement of soot and dust concentration device.
It is marked in figure as follows：
1- samplings are robbed, 2- heaters, 3- flue dust rapid measurement devices, 4- measurement of soot and dust concentration devices, 5- first order condensers, 6-
Heat traced pipeline, 7- frequency converters, 8- aspiration pumps, 9- filters, 10- accurate filters, 11- air accumulators, 12- is by pressure regulating valve, 13-
Safety valve, 14- controllers, 15- heat traced pipelines, 16- air-cushion type air spring vibration reduction devices, 17- cabinets, 18- air damping vibration dampings
Device, 19- measurement of soot and dust concentration device bottom plates, 20- hanging damping spring shock absorbers, 21- weighing sensors fix bottom plate.
Specific implementation mode
Below in conjunction with specific embodiment, the invention will be further described.
Embodiment 1
As shown in Figs. 1-3, minimum discharge flue gas particles concentration on-line monitoring device of the present invention is mainly by big flow In Situ Heating
Tracking sampling system, heat tracing transfer conduit, flue dust rapid measurement device 3, measurement of soot and dust concentration device 4, condensation and water diversion system,
Flue gas effective discharge measuring system, extraction and gas supply system, the compositions such as instrument and control system, three-level vibration absorber.
Big flow In Situ Heating tracking sampling system includes：Big flow In Situ Heating sampling gun 1 and accessory instrument group, pumping
The compositions such as pump 8, frequency converter 7, controller 14.Pitot tube, flue temperature transmitter are integrated in big flow In Situ Heating sampling gun,
Sampling flue gas humiture fluffs device, oxygen content transmitter etc..
1 overall length 2m is robbed in sampling, samples outspoken diameter 18mm, and when flue gas flow velocity is 10m/ seconds, sampling flow is
9.2m3/ hour.
The wherein total head of Pitot tube（Measuring pressure windward）Pick-up, the static pressure of Pitot tube are measured by transmitter PT101（Leeward survey
Pressure）Pick-up is measured by transmitter PT102, controller 14 calculates flue gas flow rate Vyd in flue according to the two signals.Control
Device 14 controls the rotating speed of aspiration pump by frequency converter 7, and then controls the flow of sample gas, and isokinetic sampling tracks with flow Qcy
It is measured by flow transmitter FT101, sampling flow Qcy can be calculated according to the diameter of sampling mouth and samples the flue gas stream at mouth
The relationship of fast Vcy.By the size for controlling Qcy, it can be ensured that the flue gas flow rate Vcy at sampling mouth is equal to flue gas flow velocity
Vyd.Aspiration pump 8 uses sliding vane rotary pump, and when 20Hz, the flow of pump is 15M3/ hours, by Frequency Converter Control, traceable flue
Flue gas flow rate is about 7-17m/ seconds.Pressure at expulsion>60Kpa meets the requirement of purging.
Temperature is measured by TT101 in flue.Sampling flue gas robs interior high-power electric heater 2 by sampling（Power is more than
2Kw）It completes, sampling is robbed 1 flue gas exit temperature and measured by TT102, and outlet humidity degree is measured by MT102, temperature and humidity measurement signal
It send to controller（14）, master controller controls electric heater according to temperature measurement signal, by TIC102, makes flue gas exit temperature
Maintain 120 DEG C or more.
The oxygen content that 1 outlet is robbed in sampling is measured by AT101.The oxygen amount sensor answers high temperature resistant, preferably zirconia oxygen analyzer.
Heat traced pipeline 15 is used to convey the flue gas after heating.For the temperature of the sampling flue gas of holding, heat tracing power is not low
In 100W, heat tracing pipe flue gas exit temperature is not less than 120 DEG C.Heat tracing pipe gas exhanst gas outlet.Temperature transmitter is TT103, temperature
Controller is TIC103.Temperature uses closed-loop control.The inner wall of heat tracing pipe is answered smooth, and the materials such as copper, stainless steel, nylon can be used
Matter, preferably nylon.
Flue dust rapid measurement device 3 measures deficiency not prompt enough for making up weight method.The high temperature of heat tracing pipe outflow is adopted
Sample gas initially enters flue dust rapid measurement device 3, which can be used the quickly continuous survey of the various satisfactions such as optical method, electrostatic method
The device of amount, such as can be selected that application No. is 201710074100.2 Chinese invention patents " to survey as introduced in background technology
Measure the device and method of the particle diameter distribution and mass concentration of super low concentration flue dust " and application No. is 201610719297.6 China
Flue dust flue dust in patent of invention " a kind of super low concentration wet flue gas flue dust on-line measurement device and its On-line Measuring Method " etc. is fast
Speed measuring device.It is concentration signal Cx to measure output, and signal send controller 14.The device be sent into controller 14 signal need by
Cx is used as instantaneous concentration C, C=A+B*Cx, wherein coefficient A, B to measure number according to weight method by controller 14 after needing overcompensation operation
According to automatic Fitting, each measurement period of weight method calculates once automatically, and therefore, the required precision of the device is not high, excellent
Select the measuring device of forward light scattering method.
Measurement of soot and dust concentration device 4 is to be set to after flue dust rapid measurement device 3.It can select existing based on weight
The flue dust weighing device of method, for example, device as shown in Figure 3.The device receives the order of controller 14, independently sampled,
It weighs, and weighing results is sent to controller 14, master controller is according to this value of weighing, in conjunction with sampling interval, flue gas flow
Measured value, the other parameters such as flue-gas temperature, pressure, water capacity, oxygen content calculate measurement of soot and dust concentration value, mark the folding under condition
The measurement results such as calculation value.The device is less than 30 points in the sampling interval, when inlet flow rate is less than 100 liters/min, the precision of measurement accuracy
It should be better than 0.2mg.
Condensation and water diversion system.The flue-gas temperature come out from sampling system cannot be satisfied delicate flow still at 100 DEG C or more
Meter, aspiration pump requirements of one's work, therefore, setting condensation and water diversion system after the completion of using.The flue gas after measuring is completed to use
Condensed in two stages, first order condenser 5 and air heat-exchange natural cooling, second level condenser 6 are to force to cool down, preferred semiconductor system
Cooler, it is ensured that exit gas is cooled to dew-point temperature or less.
Flue gas effective discharge measuring system is used to generate the flow standard values for calculating and needing when concentration, and the system is by flowmeter
FT201, temperature, pressure measurement transmitter PT201, TT201 of flow temperature and pressure compensation, the compositions such as oxygen content transducer AT201.Oxygen
Gauge uses electrochemical measurement.According to these parameters and the measured value of weighing device, master controller can calculate flue dust operating mode
Content marks condition content and conversion amount.
Extraction and gas supply system are used to generate the power of flue gas extraction, and generate pipeline purging pressure-air and filter
Film drying cleaned air.The system is by 7 aspiration pump 8 of frequency converter, filter 9, air accumulator 10, accurate filter 11 and shutdown
Valve S1-S5 compositions.There are three types of working conditions for the part：Sampling, blows, filter membrane drying.These three working conditions are taken out by one
Air pump is completed.
When sampling, aspiration pump 8 is the power resources of sampling pumping, and while sampling, the exit gas of pump is sent to storage simultaneously
Gas tank, for being used when purging, when filter membrane is dried, air pump and sampling apparatus of weighing constitute a cycle, gas is constantly dewet,
Heating, completes the drying of filter membrane.
Flue gas extraction, pipeline are blown, filter membrane drying cleaned air is completed with rotary vane type oil-free pressure-vaccum aspiration pump 8, sampling
When the pump controller 14, frequency converter 7 control under, track the flow velocity of flue gas, and the gas of discharge is stored in gas storage
Tank 11, for being used when purging.Dry filter membrane when, the pump controller 4, frequency converter 7 control under, constant speed operation, gas pass through
Accurate filter 10, heat tracing pipe 15 are placed in after measurement of soot and dust concentration device 4 samples cylinder heating and are dried for filter membrane.
The flow of these three state gas is respectively：
Flue gas sampling flow is：Flue gas-In Situ Heating sampling robs 1（120℃.50-200 liters/min）S1 is opened（S2, S3 are closed
It closes）- heat tracing is transmitted（120℃）- quickly measure-it is based on gravimetric method measurement-condensation-aspiration pump 8（Constant speed tracks）- S4 is beaten
It opens（S5 is closed）- air accumulator 11.
Pipeline sweeping process is：Aspiration pump 8（Full speed running）- S4 is opened（S5 is closed）- air accumulator-S2 is opened（S1,
S3 is closed）1-flue is robbed in the sampling of-In Situ Heating.
Filter membrane dries flow：Aspiration pump 8（Half Speed is run）- S5 is opened（S4 is closed）10-S3 of-accurate filter is beaten
It opens（S1, S2 are closed）- quickly measure-it is based on gravimetric method measurement-condensation-aspiration pump 8.
Controller 14 is the core of present apparatus information processing and control, and all measuring signals enter controller 14, own
Control has the completion of controller 14, controller 14 also to coordinate to sample the work of weighing device, need measurement structure and equipment
State be sent to specified place.Controller 14 can be made by PLC, microcontroller, industrial personal computer etc., preferably PLC.
Shock mitigation system is used to reduce influence of the scene vibrations to measurement.The present apparatus uses three-level vibration damping, as shown in Fig. 2,
The monitoring device further includes three-level shock mitigation system, and first order damping is to be installed on 17 bottom plate of cabinet for placing whole device
On four air-cushion type air spring vibration reduction devices 16；Second level damping is on the bottom plate 19 of measurement of soot and dust concentration device 4
Four air damping dampers 18；Third level damping is mounted on the weighing sensor fixation bottom of measurement of soot and dust concentration device 4
Four hanging damping spring shock absorbers 20 on plate 21.
Claims (7)
1. a kind of minimum discharge flue gas particles concentration on-line monitoring device, which is characterized in that including the sampling being placed in flue
It robs（1）, sampling gun（1）It is interior to be equipped with heater（2）, the sampling robs（1）Pass through heat traced pipeline（15）Flue dust is connected with quickly to survey
Measure device（3）, sampling robs（1）With flue dust rapid measurement device（3）Between heat traced pipeline（15）On be connected with shut-off valve S1, institute
State flue dust rapid measurement device（3）Outlet side the measurement of soot and dust concentration device based on gravimetric method is also associated with by pipeline（4）,
The measurement of soot and dust concentration device（4）Outlet side be also sequentially serially connected with first order condenser（5）, second level condenser（6）, take out
Air pump（8）, filter（9）；The aspiration pump（8）It is also associated with the frequency converter for controlling its work（7）, the filter
（9）Outlet side also have air accumulator by piping connection respectively（11）And accurate filter（10）；The filter（9）With gas storage
Tank（11）Between pipeline on be connected with shut-off valve S4, filter（9）With accurate filter（10）Between pipeline on be connected with
Shut-off valve S5；The accurate filter（10）Outlet side by piping connection in shut-off valve S1 and flue dust rapid measurement device
（3）Between heat traced pipeline（15）On, accurate filter（10）Outlet side pipeline on be connected with shut-off valve S3；The gas storage
Tank（11）Outlet side robbed in sampling by piping connection（1）With the heat traced pipeline between shut-off valve S1（15）On, air accumulator
（11）Outlet side pipeline on be connected with shut-off valve S2；The air accumulator（11）It is also associated with by pressure regulating valve（12）, described to add
Hot device（2）, flue dust rapid measurement device（3）, measurement of soot and dust concentration device（4）, shut-off valve S1-S5, aspiration pump（8）, frequency converter
（7）It is connected with controller jointly（14）.
2. a kind of minimum discharge flue gas particles concentration on-line monitoring device according to claim 1, which is characterized in that adopt
Sample is robbed（1）Interior setting measures the positive pressure transmitter PT101 of flue gas pressures of windward side in flue, for measuring leeward in flue
The negative pressure transmitter PT102 of flue gas pressures, the temperature transmitter TT101 for measuring temperature in flue, temperature controller
TIC102；The output of all transmitters and temperature controller is sent to controller（14）.
3. a kind of minimum discharge flue gas particles concentration on-line monitoring device according to claim 1 or 2, feature exist
In the sampling is robbed（1）It is provided with the flue-gas temperature after being respectively used to measure heating between outlet and shut-off valve S1, humidity, contains
The temperature transmitter TT102 of oxygen amount, humidity transmitter MT101, oxygen content transducer AT101, the output of all transmitters send to
Controller（14）.
4. a kind of minimum discharge flue gas particles concentration on-line monitoring device according to claim 3, which is characterized in that companion
Hot pipeline（15）Smoke outlet be provided with temperature transmitter TT103, temperature controller TIC103, flow transmitter FT101,
All transmitters and controller are sent to controller（14）.
5. a kind of minimum discharge flue gas particles concentration on-line monitoring device according to claim 4, which is characterized in that institute
State second level condenser（6）Outlet end installation oxygen content transducer AT201, temperature transmitter TT201, pressure transmitter PT201,
Flowmeter FT201, all transmitters and flowmeter are sent to controller（14）.
6. a kind of minimum discharge flue gas particles concentration on-line monitoring device according to claim 5, which is characterized in that institute
State air accumulator（11）It is also associated with safety valve（13）.
7. a kind of minimum discharge flue gas particles concentration on-line monitoring method, using minimum discharge cigarette as claimed in claim 6
Aerated particle object concentration on-line monitoring device is realized, which is characterized in that including following below scheme：
Flue gas sampling flow is：Flue gas-sampling is robbed（1）- S1 openings/S2, S3 closings-heat tracing transmission-quick measurement-base
In gravimetric method measurement-condensation-aspiration pump（8）Constant speed tracking-S4 openings/S5 closings-air accumulator 11；
Controller（14）Control aspiration pump（8）Constant speed tracks, and flue gas is sampled to be robbed（1）Through heat traced pipeline（16）It is quickly surveyed to flue dust
Measure device（3）With measurement of soot and dust concentration device（4）Afterwards, and by weighing results it is sent to controller（14）, flue gas is by the first order
Condenser（5）With second level condenser（6）Enter air accumulator through S4 after condensation（11）, into air accumulator（11）Gas for anti-
It blows, that is, carries out pipeline purging；
Pipeline sweeping process is：Aspiration pump（8）Full speed running-S4 openings/S5 closings-air accumulator（11）- S2 openings/S1, S3
- flue is robbed in closing-sampling；
Controller（14）Control aspiration pump（8）Full speed running, air accumulator（11）Interior gas enters through S2 in flue, carries out flue
Pipeline purges；
Filter membrane dries flow：Aspiration pump（8）Half Speed operation-S5 openings/S4 closings-accurate filter（10）- S3 openings/
S1, S2 are closed-quickly measuring-based on gravimetric method measurement-condensation-aspiration pump（8）；
When S5 openings/S4 is closed, from filter（9）The gas of outflow enters accurate filter（10）, then it is using S3
Measurement of soot and dust concentration device（4）Cleaned air is provided to dry for filter membrane.
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