CN109030304A - A kind of flue gas minimum discharge micronic dust detection system and detection method - Google Patents

A kind of flue gas minimum discharge micronic dust detection system and detection method Download PDF

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Publication number
CN109030304A
CN109030304A CN201810932206.6A CN201810932206A CN109030304A CN 109030304 A CN109030304 A CN 109030304A CN 201810932206 A CN201810932206 A CN 201810932206A CN 109030304 A CN109030304 A CN 109030304A
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flue gas
flue
smoke detectors
detection
gas
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刘德允
刘合祥
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Nanjing Assen Environmental Technology Co Ltd
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Nanjing Assen Environmental Technology Co Ltd
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Priority to CN201810932206.6A priority Critical patent/CN109030304A/en
Publication of CN109030304A publication Critical patent/CN109030304A/en
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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N15/00Investigating characteristics of particles; Investigating permeability, pore-volume, or surface-area of porous materials
    • G01N15/06Investigating concentration of particle suspensions
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N15/00Investigating characteristics of particles; Investigating permeability, pore-volume, or surface-area of porous materials
    • G01N15/06Investigating concentration of particle suspensions
    • G01N15/0656Investigating concentration of particle suspensions using electric, e.g. electrostatic methods or magnetic methods
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N15/00Investigating characteristics of particles; Investigating permeability, pore-volume, or surface-area of porous materials
    • G01N15/06Investigating concentration of particle suspensions
    • G01N2015/0693Investigating concentration of particle suspensions by optical means, e.g. by integrated nephelometry

Abstract

The invention discloses a kind of flue gas minimum discharge micronic dust detection system and detection methods, belong to environmental testing.Detection system of the invention includes current meter, flue dust detection unit and the mass flowmenter for detecting air mass flow, and the industrial personal computer for data processing, the flue dust detection unit includes: smoke detectors, its inlet end is connect with sampling pipe and mass flowmenter, by discharging high-voltage electricity for gas ionization, micronic dust is attached on ion in gas, obtains gas concentration by electric current;Light scattering sensor is connect with the exhaust end of smoke detectors, for detecting the mixed gas endoparticle object concentration of discharge, and by return pipe in the air delivery to flue after detection.The present invention combines smoke detectors with light scattering sensor, detects for the particulate matter to different-grain diameter, improves the precision of detection.

Description

A kind of flue gas minimum discharge micronic dust detection system and detection method
Technical field
The present invention relates to environmental monitoring technology fields, more specifically to a kind of flue gas minimum discharge micronic dust detection system System and detection method.
Background technique
With the progress of science and technology, the living standard of the people has obtained the raising of matter.At the same time, various environmental problems Also following.Haze weather and various dust produce bad influence to people's health and life, in order to avoid environment Further deteriorate, the flue dust detection that the fields such as petrochemical industry, boiler combustion, thermal power plant, steel are discharged becomes more important.
Flue dust is detected there are more scheme in the prior art, it is more smart for the Concentration Testing of particulate matter Standard, at present more be in face of discharge of pipes amount flue dust it is less in the case where, how to realize the accurate detection to micronic dust.Inspection at present It surveys the optical dust instrument used to be affected by particle size, tends not to the granule density of accurate reaction flue dust, And the accuracy and objectivity detected is particularly important, and therefore, the accurate inspection to micronic dust how is realized in low emission Survey seems more important.
For relevant programme, Chinese patent disclose it is a kind of based on jet stream modulation flue particulate matter isokinetic sampling and constant current Control system and its using above system to flue other carry out pretreated method (application number: 201711059808.7), packet Include: jet stream mod subsystem, zero gas prepare subsystem, zero gas control subsystem, sample gas and introduce subsystem, sample gas mixing subsystem System, sample gas heating subsystem, sample gas dehumidifying subsystem, particle analyte detection subsystem and air compressor.Utilize an air pressure Power source of the contracting source as jet stream modulating systems multiple in system is the jet stream tune that flow control is realized in functional subsystems at different levels System processed provides power, waits for test sample gas using the negative-pressure ward that jet stream modulating system generates, and by jet stream modulating system (by electricity Magnet valve, flowmeter, controller etc. composition) realize flue gas isokinetic sampling automatic control.
Also disclose it is a kind of based on β ray method and light scattering method particulate matter on-line monitoring system and method (application number: 201510878762.6), the concentration for particulate matter in online real―time precision measurment flue gas.The program combine β ray method and The advantages of light scattering method, realizes that β ray method measurement result calibrates the reference of light scattering method measurement result by internal reference method, To realize the concentration of particulate matter in online real―time precision measurment flue gas.
Above two patent formula is detected to flue dust, and the first string is by controlling to smoke moisture System, is reduced the influence of temperature, is detected using isokinetic sampling;Second scheme is the detection β ray method and light scattering method It is compared calibration, to realize accurate detection.But in the case where itself does not all obtain exact value, it will draw as benchmark Bigger error is played, is haveed the defects that certain.
Summary of the invention
1. technical problems to be solved by the inivention
It is an object of the invention to overcome the shortcomings of the prior art cannot it is accurate reflection flue dust granule density, provide A kind of flue gas minimum discharge micronic dust detection system and detection method.The present invention is PPS smoke detectors and light scattering sensor It combines, is detected for the particulate matter to different-grain diameter, improve the precision of detection.
2. technical solution
In order to achieve the above objectives, technical solution provided by the invention are as follows:
A kind of flue gas minimum discharge micronic dust detection system of the invention, including current meter, flue dust detection unit and for examining The mass flowmenter of air mass flow is surveyed, and for the industrial personal computer of data processing, the flue dust detection unit includes:
Smoke detectors, inlet end are connect with sampling pipe and mass flowmenter, by release high-voltage electricity that gas is electric From micronic dust is attached on ion in gas, obtains gas concentration by electric current;
Light scattering sensor is connect with the exhaust end of smoke detectors, for detecting the mixed gas endoparticle of discharge Object concentration, and by return pipe in the air delivery to flue after detection.
As further improvement of the present invention, the inlet end of the mass flowmenter is connected with solenoid valve S1, the electromagnetism The inlet end of valve S1 is provided with pressure detector, controls solenoid valve S1 on-off by the feedback signal of pressure detector.
As further improvement of the present invention, filter is provided on the air inlet pipeline of the solenoid valve S1.
As further improvement of the present invention, the exhaust end of the current meter and solenoid valve S1 are used by piping connection Blowback is carried out in the flow velocity probe to current meter.
As further improvement of the present invention, threeway is provided on the connecting line of the sampling pipe and smoke detectors Pipe, the third interface of the tee tube are connect with the exhaust end of solenoid valve S1, and solenoid valve S2 is arranged on connecting line.
As further improvement of the present invention, flue gas flow rate signal 4 that the mass flowmenter is measured according to current meter ~20mA calculates turn-on flow rate, flue gas flow rate vCigarette(m/s) with mass flowmenter turn-on flow rate QMeterAlgorithm model are as follows:
4~20mA of flue gas flow rate signal corresponds to flue gas flow rate v cigarette (m/s) 0~40m/s of value, then has vCigarette=2.5*i-10 formula Middle i is flue gas flow rate output current signal.
As further improvement of the present invention, the smoke detectors set flow as L, and smoke detectors export dense Angle value is Mpps, practical particle concentration is M 'pps, then conversion relation are as follows:
If a certain moment output concentration value of light scattering sensor is Mpm, the concentration value after practical conversion is M 'pm, then convert Relational expression are as follows:
In formula: QIt inhalesIt is the sample gas flow of practical sucking smoke detectors;QMeterFor mass flowmenter turn-on flow rate.
A kind of flue gas minimum discharge micronic dust detection method of the invention, is detected using said detecting system, including with Lower step:
S1, system energization preheat, and are heated to predetermined temperature inside smoke detectors, and heating temperature signal is passed to work Control machine;
S2, start air supply, solenoid valve S1 is open-minded when pressure detector detects that air pressure meets setting value, matter The turn-on flow rate for the flue gas flow rate control mass flowmenter measuring flowmeter to open, and being detected according to current meter;
S3, gas enter smoke detectors by mass flowmenter, and smoke detectors inner jet forms negative pressure, by cigarette Flue gas is drawn into smoke detectors by sampling pipe in road;
Metal needle release high pressure is by gas ionization in S4, smoke detectors, and dust particale adheres to ion quilt in sample gas Charging, when sample gas outflow, galvanometer passes through the concentration M that the electric current measured obtains sample gas in smoke detectorspps
S5, sample gas enter light scattering sensor after mixing with air, detect remainder particulate object concentration Mpm, after detection Gas is drained into flue by return pipe.
As further improvement of the present invention, total particulate concentration value M is answered in sample gas are as follows: M=Kpps*M′pps+ Kpm*M′pm, K in formulappsAnd KpmWeighting coefficient when to calibrate, default value 1.
Further include reverse-blowing block-resistant process after step S5 as further improvement of the present invention: closing mass flowmenter Valve port, open solenoid valve S2, air enters sampling pipe and smoke detectors are purged.
The present invention detects Computing Principle are as follows: industrial personal computer acquires current meter signal first, calculates current flue gas flow velocity Value;Then turn-on flow rate of the industry control screen through fitting algorithm output mass flowmenter control signal control mass flowmenter, flue dust inspection Surveying unit is one similar to jet pump device, and there are certain mathematical model, such flue dust detections with charge flow rate for sampling flow Flow velocity when unit sampling flow rate conversion is to flue gas feeler lever sampling pipe is exactly current flue gas flow rate, to realize isokinetic sampling.
Flue dust detection unit first detects the micronic dust mass concentration value that sampling flue gas partial size is less than or equal to 2.5um, then exports Micronic dust mass concentration value through light scattering sensor detection partial size 2.5um~10um, however light scattering sensor detected value is to adopt Sample flue gas mix with air after micronic dust mass concentration value, therefore the micronic dust mass concentration value that obtain in sampling flue gas need to also be into Row conversion.
3. beneficial effect
Using technical solution provided by the invention, compared with prior art, have the following beneficial effects:
(1) detection system of the invention, using category measurement particle concentration method, when particulate matter diameter is less than or equal to At 2.5 microns, value conversion is measured by smoke detectors, when particulate matter diameter is greater than 2.5 microns less than 10 microns, is passed through Light scattering sensor measures, both be added after result conversion and obtain total dust concentration, improve the precision of detection.
(2) present invention is controlled by charge flow rate of the algorithm to mass flowmenter, can realize constant speed, constant current as required Detection mode reduces influence of the flow velocity to testing result, helps to improve the accuracy of detection.
(3) present invention extracts flue gas by negative pressure jet current principle, easily measures, and the design of reverse-blowing block-resistant structure grow equipment can Phase uses, and reasonable in design, principle is simple, convenient for promoting the use of.
Detailed description of the invention
Fig. 1 is system structure diagram of the invention.
Label declaration in schematic diagram: 100, filter;101, pressure detector;200, mass flowmenter;201, flue dust Detector;202, light scattering sensor;203, current meter;300, flue;301, return pipe;302, sampling pipe;303, flow velocity is visited Head.
Specific embodiment
To further appreciate that the contents of the present invention, the present invention is described in detail in conjunction with the accompanying drawings and embodiments.
Embodiment
In conjunction with Fig. 1, a kind of flue gas minimum discharge micronic dust detection system of the present embodiment, including the detection of current meter 203, flue dust Unit and mass flowmenter 200 for detecting air mass flow, and the industrial personal computer for data processing.
Current meter 203 is flow velocity probe 303, flow velocity for detecting gas flow rate in flue, the detection part of current meter 203 Probe 303 is made of Pitot tube and sensor, and flow velocity probe 303 is fixed on flue and is protruded into inside flue, can be used for The detection of gas flow rate in flue.
Establishing model makes current meter export 4~20mA of analog signal, after AD conversion corresponding digital quantity for 4000~ 20000, corresponding practical flue gas flow rate is 0~40m/s.If certain instantaneous output analog current signal is i, corresponding practical flue gas flow rate For v, the digital quantity of sampling is D2, then digital quantity and corresponding practical flue gas flow rate conversion relation are as follows:By right Constant speed or Constant flow sample are realized in the measurement and calculating of flow velocity.
According to the corresponding practical flue gas flow rate v of analog signal i:4~20mACigarette: 0~40m/s, can establish both sides relation has
vCigarette=2.5*i-10
Further, it is provided with blowback interface on current meter 203, it is connect with air intake duct, one can used Blowback is carried out after the section time, for preventing sensor to be blocked.
Mass flowmenter 200 is used to detect the air mass flow of external entrance, and can control uninterrupted by valve port opening, It is used cooperatively with current meter 203, can be realized constant speed, Constant flow sample.Mass flowmenter 200 can select CS200 model MFC1, one end of mass flowmenter 200 and the supply air line of outside air connect, the other end and 201 lower part of smoke detectors Air intake duct connection, for outside air to be quantitatively transported in smoke detectors 201.
Flue dust detection unit includes smoke detectors 201 and light scattering sensor 202, and smoke detectors 201 are Pegasor Sensor, the pipeline that bottom is connect with mass flowmenter 200 lead to jet pump, can generate jet effect in inside.Flue dust inspection The gas inlet and 302 piping connection of sampling pipe for surveying device 201, for obtaining sample gas.
Light scattering sensor 202 is connect with the exhaust end of smoke detectors 201, for detect discharge mixed gas in Grain object concentration, and by return pipe 301 in the air delivery after detection to flue 300.
Outside air can use compressed air, and solenoid valve S1 and pressure detector 101 are arranged on pipeline, pass through Pressure in 101 signal piping of pressure detector, and feedback signal controls solenoid valve S1 on-off.It is also set up in the inlet end of pipeline There is filter 100, for filtering the air, avoids influencing testing result with the presence of particulate matter.
Be provided with tee tube on the connecting line of sampling pipe 302 and smoke detectors 201, the third interface of the tee tube with The exhaust end of solenoid valve S1 connects, and solenoid valve S2 is arranged on connecting line.It is closed when the valve port of mass flowmenter 200 Afterwards, outside air can be entered sampling pipe 302 by tee tube interface and carry out blowback, for clearing up the dust accumulation on pipeline, be prevented Only it is blocked.Smoke detectors 201 can be purged simultaneously, cleaning accumulation flue dust.
In addition, as an implementation, the blowback pipeline of solenoid valve S2 coutroi velocity instrument 203 can be used simultaneously, i.e., it is sharp Two branches are connect with air inlet pipeline with tee tube, solenoid valve S2 is arranged on air inlet pipeline, then utilize solenoid valve S2 The on-off of two branches can be controlled simultaneously.
Industrial personal computer is whole control system in the present invention, with current meter 203, smoke detectors 201, mass flowmenter 200 electrical connections, for receiving signal and completing corresponding signal processing, generate corresponding instruction.Solenoid valve S1 and pressure detecting Device 101 is connected to industrial personal computer, is controlled by industrial personal computer.
In order to realize isokinetic sampling, mass flowmenter 200 needs to cooperate with current meter 203.Mass flowmenter 200 is used In carrying out accurate control to gas, according to the flue gas flow rate signal that current meter 203 is measured come turn-on flow rate, the present embodiment is to use 4~20mA of flue gas flow rate signal calculates turn-on flow rate, flue gas flow rate vCigarette(m/s) with mass flowmenter turn-on flow rate QMeterAlgorithm Model are as follows:
4~20mA of flue gas flow rate signal corresponds to flue gas flow rate vCigarette(m/s) 0~40m/s of value then has vCigaretteIn=2.5*f-10 formula I is flue gas flow rate output current signal.
201 inner setting flow of smoke detectors is L, i.e. metered flow is L, as air mass flow QMeterIt is corresponding when increase The flow of sample gas can be reduced, to make change in flow, realize isokinetic sampling.For the model of 4~20mA of flue gas flow rate signal It encloses, by design and calculation in this example, derives that its relationship between flow, isokinetic sampling's result are more accurate.
Smoke detectors 201 set flow as L, and the concentration value of smoke detectors output is Mpps, practical in sample gas Grain object concentration is M 'pps, then conversion relation are as follows:
If a certain moment output concentration value of light scattering sensor is Mpm, the concentration in sample gas is corresponded to after practical conversion Value is M 'pm, then conversion relation formula are as follows:
In formula: QIt inhalesIt is the sample gas flow of practical sucking smoke detectors;QMeterFor mass flowmenter turn-on flow rate.
Above-mentioned calculation formula is added two detected values, and then obtains total concentration value.In conventional detection device, greatly Mostly it is individually to detect, causes result inaccurate.The particulate matter classification and Detection in flue gas in the present invention, when particle concentration is straight When diameter is less than or equal to 2.5 microns, is detected by smoke detectors PPS and convert to obtain actual concentrations value, when particulate matter diameter is big It when in 2.5 microns less than 10 microns, is measured by light scattering sensor, and obtains actual concentration value by conversion, most The granule density value of the two is added afterwards, obtains accurate flue gas concentration.
In use, since device itself may have certain error, before use, can be first to device It is calibrated.Using fixed flow rate simulated flue gas flue circulate, then using detection system detect and convert locate it is corresponding Value, corresponding weighting coefficient is all arranged in two concentration values, by repeatedly measuring available weighting coefficient values.
Total particulate concentration value M is answered in sample gas are as follows: M=Kpps*M′pps+Kpm*M′pm, K in formulappsAnd KpmWhen to calibrate Weighting coefficient.
If the detection of single unit system and flow velocity is all more accurate, it is directly sum of the two that weighting coefficient, which is all 1, because This can set weighting coefficient default value as 1.
The present invention also provides a kind of flue gas minimum discharge micronic dust detection methods, are detected using said detecting system, The following steps are included:
S1, system energization preheat, and are heated to predetermined temperature inside smoke detectors 201, and heating temperature signal is transmitted To industrial personal computer.At work, first with 201 pairs of smoke detectors internal system warm-ups, industrial personal computer constantly sends signal-obtaining Heating temperature information exports corresponding signal to industrial personal computer when smoke detectors 201 are heated to predetermined temperature.
S2, start air supply, solenoid valve S1 is opened when pressure detector 101 detects that air pressure meets setting value Logical, mass flowmenter 200 is opened, and the unlatching stream of the flue gas flow rate control mass flowmenter 200 detected according to current meter 203 Amount.
During heating, blowing function is closed, and solenoid valve S1 is controlled by ambient pressure, when meeting the pressure value of setting, Solenoid valve S1 is open-minded, otherwise closes.After solenoid valve S1 unlatching, mass flowmenter 200 is opened.
Turn-on flow rate, flue gas flow rate v are calculated in 4~20mA of flue gas flow rate signalCigarette(m/s) with mass flowmenter turn-on flow rate QMeterRelationship are as follows:
V in formulaCigarette=2.5*i-10;I is flue gas flow rate output current signal.
S3, extraneous gas enter smoke detectors 201 by mass flowmenter 200, and penetrate inside smoke detectors 201 Stream forms negative pressure, and flue gas in flue 300 is drawn into smoke detectors 201 by sampling pipe 302.
Metal needle release high voltage electricity forms electric field in S4, smoke detectors 201, micro- in sample gas by gas ionization Dirt particle is attached on ion and is electrically charged, and when sample gas outflow, galvanometer passes through the electric current measured in smoke detectors Obtain the concentration M of sample gaspps
Smoke detectors 201 are connected with mass flowmenter 200, when extraneous compressed air or zero gas are logical by flowmeter 200 When entering smoke detectors 201, air is ionized, and is then mixed with sample gas, and the dust particale object in sample gas is filled Electricity, after extra electric field, the ion of remaining adhesion of particles is absorbed mixed gas by electric field, only the surplus fine-grained ion of attachment Charge, when gas outflow, then resulting electric current just reflects the concentration of sample gas.
Practical particle concentration is M ' in sample gaspps, then conversion relation are as follows:
If a certain moment output concentration value of light scattering sensor is Mpm, the concentration in sample gas is corresponded to after practical conversion Value is M 'pm, then conversion relation formula are as follows:
QIt inhales、QMeterRespectively smoke detectors sampling flow and mass flowmenter output flow, QIt inhalesCurrent flue gas stream can be passed through Speed and thief hatch sectional area are calculated.
QMeterWith QIt inhalesThe sum of it is identical as the total flow of smoke detectors.
And then total particulate concentration value M in sample gas can be calculated and answered are as follows: M=Kpps*M′pps+Kpm*M′pm, K in formulappsWith KpmWeighting coefficient when to calibrate, default value 1.
S5, sample gas enter light scattering sensor 202 after mixing with air, detect remainder particulate object concentration Mpm, inspection Gas is drained into flue 300 by return pipe 301 after survey.
After used a period of time, inside may accumulate many dusts, and then can carry out anti-blocking blowback, and blowback is anti- Stifled process: closing the valve port of mass flowmenter 200, opens solenoid valve S2, and air enters sampling pipe 302 and smoke detectors 201 It is purged.
The present invention uses category measurement particle concentration method, when particulate matter diameter is less than or equal to 2.5 microns, passes through cigarette Dirt detector measures value conversion, when particulate matter diameter is greater than 2.5 microns less than 10 microns, is surveyed by light scattering sensor It is fixed, total dust concentration is obtained being added after the two result conversion, improves the precision of detection.
Schematically the present invention and embodiments thereof are described above, description is not limiting, institute in attached drawing What is shown is also one of embodiments of the present invention, and actual structure is not limited to this.So if the common skill of this field Art personnel are enlightened by it, without departing from the spirit of the invention, are not inventively designed and the technical solution Similar frame mode and embodiment, are within the scope of protection of the invention.

Claims (10)

1. a kind of flue gas minimum discharge micronic dust detection system, including current meter (203), flue dust detection unit and for detecting air The mass flowmenter (200) of flow, and the industrial personal computer for data processing, which is characterized in that the flue dust detection unit packet It includes:
Smoke detectors (201), inlet end are connect with sampling pipe (302) and mass flowmenter (200), by discharging high pressure Electricity is by gas ionization, and micronic dust is attached on ion in gas, obtains gas concentration by electric current;
Light scattering sensor (202) is connect with the exhaust end of smoke detectors (201), for detecting the mixed gas of discharge Endoparticle object concentration, and by return pipe (301) in the air delivery after detection to flue (300).
2. a kind of flue gas minimum discharge micronic dust detection system according to claim 1, it is characterised in that: the mass flow The inlet end of meter (200) is connected with solenoid valve S1, and the inlet end of solenoid valve S1 is provided with pressure detector (101), passes through pressure The feedback signal of force detector (101) controls solenoid valve S1 on-off.
3. a kind of flue gas minimum discharge micronic dust detection system according to claim 2, it is characterised in that: the solenoid valve S1 Air inlet pipeline on be provided with filter (100).
4. a kind of flue gas minimum discharge micronic dust detection system according to claim 2, it is characterised in that: the current meter (203) blowback is carried out for the flow velocity probe (303) to current meter (203) by piping connection with the exhaust end of solenoid valve S1.
5. a kind of flue gas minimum discharge micronic dust detection system according to claim 2, it is characterised in that: the sampling pipe (302) and it is provided with tee tube on the connecting line of smoke detectors (201), the third interface of the tee tube is with solenoid valve S1's Exhaust end connection, and solenoid valve S2 is set on connecting line.
6. a kind of flue gas minimum discharge micronic dust detection system according to claim 1, it is characterised in that: the mass flow Meter (200) calculates turn-on flow rate, flue gas flow rate v according to 4~20mA of flue gas flow rate signal that current meter (203) is measuredCigarette(m/s) With mass flowmenter turn-on flow rate QMeterAlgorithm model are as follows:
4~20mA of flue gas flow rate signal corresponds to flue gas flow rate vCigarette(m/s) 0~40m/s of value then has vCigaretteI is in=2.5*i-10 formula Flue gas flow rate output current signal.
7. a kind of flue gas minimum discharge micronic dust detection system according to claim 1, it is characterised in that: the flue dust detection Device (201) sets flow as L, and the concentration value of smoke detectors output is Mpps, practical particle concentration is M 'pps, then pass of converting System are as follows:
If a certain moment output concentration value of light scattering sensor is Mpm, the concentration value after practical conversion is M 'pm, then conversion relation formula Are as follows:
In formula: QIt inhalesIt is the sample gas flow of practical sucking smoke detectors;QMeterFor mass flowmenter turn-on flow rate.
8. a kind of flue gas minimum discharge micronic dust detection method, is examined using detection system described in any one of claim 1~7 It surveys, which comprises the following steps:
S1, system energization preheating, smoke detectors (201) are internal to be heated to predetermined temperature, and heating temperature signal is passed to Industrial personal computer;
S2, start air supply, when pressure detector (101) detects that air pressure meets setting value, solenoid valve S1 is open-minded, Mass flowmenter (200) is opened, and the flue gas flow rate detected according to current meter (203) controls opening for mass flowmenter (200) Open flow;
S3, gas enter smoke detectors (201) by mass flowmenter (200), smoke detectors (201) inner jet shape At negative pressure, flue (300) interior flue gas is drawn into smoke detectors (201) by sampling pipe (302);
S4, smoke detectors (201) interior metal needle release high pressure are by gas ionization, and dust particale adheres to ion quilt in sample gas Charging, when sample gas outflow, galvanometer passes through the concentration M that the electric current measured obtains sample gas in smoke detectorspps
S5, sample gas enter light scattering sensor (202) after mixing with air, and detect remainder particulate object concentration Mpm, detection Gas is drained into flue (300) by return pipe (301) afterwards.
9. a kind of flue gas minimum discharge micronic dust detection method according to claim 8, it is characterised in that: total in sample gas Particle concentration value M is answered are as follows: M=Kpps*M′pps+Kpm*M′pm, K in formulappsAnd KpmWeighting coefficient when to calibrate, default value are 1。
10. a kind of flue gas minimum discharge micronic dust detection method according to claim 8, it is characterised in that: after step S5 Further include reverse-blowing block-resistant process: closing the valve port of mass flowmenter (200), open solenoid valve S2, air enters sampling pipe (302) It is purged with smoke detectors (201).
CN201810932206.6A 2018-08-16 2018-08-16 A kind of flue gas minimum discharge micronic dust detection system and detection method Pending CN109030304A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110208156A (en) * 2019-06-05 2019-09-06 盐城市联鑫钢铁有限公司 A kind of Smoke Monitoring System

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110208156A (en) * 2019-06-05 2019-09-06 盐城市联鑫钢铁有限公司 A kind of Smoke Monitoring System

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