CN106248628A - Light scattering formula dust concentration meter and the assay method of dust concentration - Google Patents
Light scattering formula dust concentration meter and the assay method of dust concentration Download PDFInfo
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- CN106248628A CN106248628A CN201510670300.5A CN201510670300A CN106248628A CN 106248628 A CN106248628 A CN 106248628A CN 201510670300 A CN201510670300 A CN 201510670300A CN 106248628 A CN106248628 A CN 106248628A
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- waste gas
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Abstract
Even if providing the light scattering formula dust concentration meter that the waste gas of a kind of low flow velocity also can be measured, even if the flowing of the muddy waste gas in flue is low speed, this light scattering formula dust concentration meter also continuously and correctly can also can directly measure the dust concentration in muddy waste gas in addition chronically in flue.This dust concentration meter directly measures the dust concentration in muddy waste gas in flue, it is by gasification installation, Blast mechanisms etc. are constituted, wherein, after described gasification installation will measure the separation of object muddiness waste gas in described flue, the mist in mensuration object muddiness waste gas is made to gasify, described Blast mechanism makes gas curtain be formed at gasification installation downstream, this gas curtain by the region of state maintaining mist to gasify via gasification installation and does not separates via the muddy waste gas of gasification installation, scattered light after reflecting the dust after being removed mist in described gas curtain detects, to obtain the dust concentration in muddy waste gas.
Description
Technical field
The present invention relates to a kind of dust concentration meter, more specifically, even if relating to the waste gas of a kind of low flow velocity
Also the light scattering formula dust concentration meter being measured and the assay method of dust concentration, even if muddy waste gas
Flowing be low speed, also can directly in flue continuously and correctly, additionally can also be chronically in flue
It is in below dew point to make mist (droplet particles) and dust (solids) adsorb, coexist and muddiness muddy
Dust concentration in turbid waste gas is measured.
Background technology
From the waste gas that the flue of various factories is discharged, contain sulfide, nitrogen oxides etc. in large quantities harmful
Material.Therefore, obligated the emission-control equipment such as desulfurizer, denitrification apparatus is set in exhaust path.
On the other hand, dust also is provided with to the discharge concentration restriction of regulation.Such as, in paper mill etc.,
The mist used in above-mentioned emission-control equipment becomes Bai Yaner and discharges from chimney.See that the periphery of this white cigarette occupies
The people more send whether discharged the such complaint of dust of more than limits value, uneasiness towards factory.
Therefore, in various factories, need correctly to hold white cigarette and be because limiting the dust row of more than benchmark
Go out and cause be also because what mist caused, and confirm all the time to have observed to discharge relevant restriction to dust.
As dust concentration meter, it is currently known a kind of light scattering formula dust concentration meter.Current light scattering formula
Dust concentration meter can the dust concentration in the real time measure waste gas continuously, but in the desulfurization of the waste gas using mist
The downstream of device etc., waste gas becomes the muddy waste gas of below dew point, containing substantial amounts of mist together with dust,
Therefore, in principle, the mensuration of correct dust concentration it is difficult to because of the impact of mist.
On the other hand, the probe tube of a kind of part arranging in flue and gathering muddy waste gas is also disclosed
The mist that (attraction path) the sensing chamber being directed into outside flue by waste gas are distributed with the particle diameter measuring mist
Particle size determination device (patent documentation 1).
The mist particle size distribution analyzer described in patent documentation 1 sensing chamber 4 upstream extremity continuously
The particle diameter measuring dust and mist with optical sensor (light source 6, light collecting lens 7, light-receiving device 10) divides
Cloth, (adds hot charging in this optical sensor downstream towards by the muddy waste gas irradiation heating light of sensing chamber 4
Put 15, laser lens 16) so that mist gasification, additionally, at this irradiation subordinate's trip optical sensor
(light source 8, light collecting lens 9, light-receiving device 11) measures the particle diameter distribution of the dust after mist gasification.Additionally,
Utilize calculating machine 12,13 and compare resolver 14 particle diameter before and after the gasification of the mist determined is distributed into
Row compares, and measures the particle diameter distribution of mist continuously.
But, according to the mist particle size distribution analyzer of patent documentation 1, although the particle diameter of mist can be measured
Distribution, but dust concentration can not be measured.It addition, in the apparatus, use certain length, small-bore take
Sample pipe, therefore, dust, mist precipitate, are attached in probe tube, thereby, cause probe tube to block, from
And the muddy waste gas being difficult to make to discharge from flue continuously and correctly is gathered to inspection chamber 4 by probe tube.
It is thus impossible to the dust concentration correctly measured from the muddy waste gas that flue is discharged, and, it is impossible to
Measure for a long time.
Therefore, inventor has invented a kind of light scattering formula dust concentration meter (patent documentation 2), this light scattering
Formula dust concentration meter does not use for a part for the muddy waste gas in flue is gathered the inspection outside flue
Look into the probe tube of room, but directly can measure muddiness in flue continuously and correctly, the most for a long time
Dust concentration in waste gas.
As in figure 2 it is shown, the light scattering formula dust concentration meter 1 of the invention of patent documentation 1 will be at flue 6
The muddy waste gas that interior mist 10 and dust 11 adsorb, coexists attract sampling to outside above-mentioned flue 6, but
Directly measure the dust concentration in above-mentioned muddy waste gas in above-mentioned flue 6, light scattering formula dust concentration meter 1 by
Instantaneous heater 3, light illuminator 4, light scattering detector 5, case 1a, arithmetic unit 12 are constituted, wherein,
Above-mentioned instantaneous heater 3 makes heating light 3a focus in above-mentioned flue 6 to form make in muddy waste gas thin
The transient heating region 7 of mist 10 gasification, above-mentioned light illuminator 4 is above-mentioned muddy towards above-mentioned transient heating region 7
The flow direction positive downstream illumination wavelength of turbid waste gas and above-mentioned measurement light 4a different for heating light 3a are above-mentioned scattered
Penetrate photodetector 5 above-mentioned measurement light 4a to be reflected via the dust 11 in above-mentioned transient heating region 7 and dissipates
Scattered light 4b penetrated detects, above-mentioned case 1a along the flow direction of above-mentioned muddy waste gas at above-mentioned flue
The same side of 6 is arranged in sequence with above-mentioned instantaneous heater 3, above-mentioned light illuminator 4, the detection of above-mentioned scattered light
Device 5 and carry out concentrate storage, above-mentioned arithmetic unit 12 with detected by above-mentioned light scattering detector 5 dissipate
Obtain the dust concentration in above-mentioned muddy waste gas based on penetrating light intensity, above-mentioned case 1a is connected to above-mentioned
One flange of the connecting tube that flue connects.
Additionally, when the application of patent documentation 2, in the case of the flows faster of muddy waste gas, unrealized
Transient evaporation, it is envisaged that measured value receives the impact of mist 10.Therefore, light scattering formula is only accounted for
The length of the heating region of dust concentration meter 1 and scope and add heat.
But, even if in the case of velocity ratio about the 10m/sec of muddy waste gas is fast, also water can be steamed
Gas mist transient evaporation, can METHOD FOR CONTINUOUS DETERMINATION dust concentration.But, at the velocity ratio 2m/sec of muddy waste gas
In the case of left and right is slow, muddy waste gas around can be involved in scattering photo detection area 8, and light scattering formula dust is dense
The measured value of degree meter 1 receives the impact of steam mist.
It addition, when patent documentation 2 is applied for, be inserted into the light scattering formula dust concentration meter of the inside of flue 6
1 is in high temperature, accordingly, it is considered to be in drying regime for the steam dust in muddy waste gas is heated,
Dust for light scattering formula dust concentration meter 1 pollutes, and is not provided with special anti-locking mechanism.
But, by light scattering formula dust concentration meter 1 actual installation in the flue having muddy waste gas to flow to carry out
Find during back-to-back testing, muddy because being imported with low temperature near the muddy exhaust gas entrance of light scattering formula dust concentration meter 1
Turbid waste gas and do not become high temperature.Therefore, the mist 10 of water vapour is at light scattering formula dust concentration meter 1
Entrance condensation is also accumulated as drain water, it is thus possible to the attachment of prediction dust 11 and growth.
Prior art literature
Patent documentation
Patent documentation 1: Japanese Patent Laid-Open No. Sho 64-15634 publication
Patent documentation 2: No. 5453607 publication of Japanese Patent Laid
Summary of the invention
Therefore, even if the present invention provides the light scattering formula dust that the waste gas of a kind of low flow velocity also can be measured
Densitometer and the assay method of dust concentration, this light scattering formula dust concentration meter does not use for by flue
The part of muddy waste gas gather the probe tube to the inspection chamber outside flue, even if but the stream of muddy waste gas
Move as low speed, also can directly measure in muddy waste gas continuously and correctly, the most for a long time in flue
Dust concentration.Additionally, its purpose also resides in and provides a kind of and prevent from introducing towards gasification installation at muddy waste gas
Intake side produce the condensed drain water of mist, prevent light scattering formula dust concentration meter that dust adheres to and
The assay method of dust concentration.
Solve the technical scheme that technical problem is used
In order to solve above-mentioned technical problem, even if the waste gas of the low flow velocity of first technical scheme of the present invention is also
The light scattering formula dust concentration meter that can be measured, not by mist in flue and dust adsorption, coexists
Muddy waste gas attracts outside sampling extremely described flue, but directly measures the ash in muddy waste gas in described flue
Dust concentration, it is characterised in that by gasification installation, Blast mechanism, light illuminator, light scattering detector, fortune
Calculation device is constituted, wherein, after described gasification installation will measure the separation of object muddiness waste gas in described flue,
Making the mist in described mensuration object muddiness waste gas gasify, gas curtain is formed at described gasification by described Blast mechanism
Device downstream, this gas curtain by the region of state maintaining mist to gasify via described gasification installation and not via
Separately, described light illuminator is towards described mist gas in described gas curtain for the described muddy waste gas of described gasification installation
The area illumination light changed, the dust after described light scattering detector is removed mist to described light reflects and is formed
Scattered light detect, described arithmetic unit is based on the scattered light intensity detected by described light scattering detector
Degree obtains the dust concentration in described muddy waste gas.
Even if the light scattering formula ash that the waste gas of the low flow velocity of the present invention the second technical scheme also can be measured
Dust concentration meter is on the basis of the present invention the first technical scheme, it is characterised in that described gasification installation is by interior
Cylinder, sheathed heater and the first container are constituted, and wherein, described inner core includes path and left and right side in inside
Opening, this path passes through along the muddy waste gas stream in described flue for measuring object muddiness waste gas, described
Sheathed heater is wound in the periphery of described inner core, and described first container receives described inner core and sheath heating
Device, described first container is fixed on inside described flue.
Even if the light scattering formula ash that the waste gas of the low flow velocity of the present invention the 3rd technical scheme also can be measured
Dust concentration meter is on the basis of the present invention the second technical scheme, it is characterised in that described gas curtain is by from described
First container is formed towards the air of the downstream ejection of muddy waste gas stream all the time.
Even if the light scattering formula ash that the waste gas of the low flow velocity of the present invention the 4th technical scheme also can be measured
Dust concentration meter is on the basis of the present invention the second technical scheme or the 3rd technical scheme, it is characterised in that institute
State light illuminator and light scattering detector is accommodated in the second container arranged that is connected with described first container, in institute
That states second container is formed above described gas curtain.
Even if the light scattering formula ash that the waste gas of the low flow velocity of the present invention the 5th technical scheme also can be measured
Dust concentration meter is in the present invention the first technical scheme to the 4th technical scheme on the basis of arbitrary technical scheme,
It is characterized in that, the intake side spray towards the muddy waste gas of described gasification installation goes out the air blast of interval.
Even if the survey of the dust concentration that the waste gas of the low flow velocity of the present invention the 6th technical scheme also can be measured
Determine method, do not attract sampling to described cigarette mist in flue and dust adsorption, the muddy waste gas that coexists
Outside road, but in described flue, directly measure the dust concentration in described muddy waste gas, it is characterised in that
To measure after object muddiness waste gas separates in described flue, make in described mensuration object muddiness waste gas is thin
Fog, is formed and region and the described muddiness of the state maintaining mist to gasify via described gasification installation is given up
The separate gas curtain of gas, towards the area illumination light of maintenance mist vaporized state in described gas curtain, to described light quilt
The scattered light removing the scattering of the dust after mist detects, the scattered light intensity detected obtain described muddy
Dust concentration in turbid waste gas.
Herein, flue refers to that the path for discharging waste gas, muddy waste gas refer to going out of the gas cleaner such as wet type
It is in below dew point in mouth flue like that and makes dust and mist coexist, adsorb and muddy waste gas.
Gasification installation refers to utilize the heater heating such as sheathed heater, irradiate the heating light such as light so that mist steams
The device sent out or make the mist in flue gasify by excitation, decompression additive method, can exemplify heater
Deng.Vaporized for mist region is referred to as heating region.
Heating light refers to the heating source such as laser generated in the radiant heat of infrared heater, laser generator,
The a part of region that can be directly gathered in flue, to form transient heating region in flue.Add in moment
In thermal region, the instantaneous gasification of mist in muddy waste gas, from dust separation, diffusion and from transient heating region
Middle removal.Other, as heating source, also can exemplify microwave etc..
As the means making heating light assemble, such as, can exemplify in the radiant heat of infrared heater,
Utilize lens, concave mirror, in the heating light of laser instrument, use the heating light of multiple little output and concentrate on
Focus, the method in a part of region to be directly gathered in flue.
As an example of the generating means of heating light, such as, can exemplify till (can) carrying out 1400 DEG C
Heating Feng Tai section (exabyte: Off ィ Application テ ッ Network (fintech)) system point a light collecting type heater HSH
Deng.If this device, the most also can control to heat the gathering position of light, the volume of heating region, heating temperature
Degree.Thereby, the transient heating region of minimum volume can be formed in flue.
As heating-up temperature, mist can reliably gasify and the incombustible temperature province of dust such as 100 DEG C～
About 500 DEG C is ideal.If this scope, then can determine more accurate dust concentration.
On the other hand, by using sheathed heater as heating source, to employ light collecting lens compared with utilization
Heating light transient evaporation, can carry out longer time laser heating.In this case, need prevent with
The defective insulation of the power supply wiring terminal that the more muddy waste gas of moisture directly contacts.
Such as, as with muddy waste gas isolation and indirectly carry out the heating means heated, can exemplify around
The pipe flow through for muddy waste gas helically winds sheathed heater, covers sheathed heater in addition, makes muddiness
The structure that waste gas does not directly contact with sheathed heater.In this case, it may be desirable to, by protecting
Set heater incorporating section loads thermocouple and is connected with attemperator, so that the temperature of sheathed heater can be carried out
Degree sets and temperature controls.By arranging thermocouple, correspondingly can carry out with the temperature of muddy waste gas and flow velocity
Optimal temperature sets, and sheathed heater can be prevented overheated and improve the life-span.
Measure light refer to from light illuminator expose to just via the region after (moment) heating region (muddy
The flow direction positive downstream of turbid waste gas maintains the region of the vaporized state of mist) light.As measuring light, logical
Cross and use the wavelength different from heating light, improve the accuracy of detection of scattered light.
Additionally, when only using the light of wavelength region of regulation using as when measuring light, scattered light also can be as spy
The light of standing wave length is detected, and can detect scattered light accurately, therefore, be ideal.Such as,
By using the light all detected with certain Wavelength synchronous can obtain, more specifically, through only making spy
The light of standing wave length by optical filter irradiate and can obtain.
Scattered light refer to from light illuminator expose to scatter photo detection area measurement light because of eliminate mist it
After dust and the light that scatters.Just via in the region after heating region, the muddiness in non-heated region is given up
The mist contained in gas is not mixed into, even if heating region scattering photo detection area is also maintained, therefore,
The light quantity (light intensity) of scattered light is proportional to dust concentration.
Light scattering detector is that the light quantity to the scattered light scattered because of the dust after eliminating mist is carried out
The device of detection.Additionally, such as, if the proportionate relationship of the light intensity of pre-made dust concentration and scattered light
Detection line, then can be obtained the dust concentration relative to the scattered light intensity detected by above-mentioned detection line.Separately
Outward, in the case of unused optical filter synchronous detecting goes out to measure light, it is also possible to only make the wavelength of scattered light
Light by optical filter use light scattering detector light, so that scattered light intensity to be detected.
Such as, as light illuminator, light scattering detector, (strain) Tanaka can be used electrically to study made
The infrared LEDs (light emitting diode) of DDM-HAL2 and photodetector (photodiode), Japan are specially
Profit photo-electric particle concentration determinator etc. described in Unexamined Patent 09-236545 publication.
Arithmetic unit is to calculate the ash in muddy waste gas based on the light intensity detected by light scattering detector
The device of dust concentration, it is computer etc..As operation method, such as, pre-made dust concentration is with scattered
Penetrate the proportion expression (expression of first degree etc.) of the light intensity of light, be stored in the storage part of arithmetic unit, by detect
Scattered light is substituting to proportion expression, thus obtains dust concentration, and in the display with mg/m3 NUnit direct
Display.
The present invention uses said structure, therefore, need not be provided for gathering the sampling of a part for muddy waste gas
Pipe, can make the mist in muddy waste gas gasify in flue, even if the flowing of muddy waste gas is low speed, also
Can be by the air-flow after the mist measuring object muddiness waste gas being gasified with gas curtain and untreated muddy waste gas
Separately, isolation, thus there is no the impact of mist, can light quantity based on scattered light, measure continuously and correctly
Dust concentration.
In addition, even if the light scattering formula dust that also can be measured of the waste gas of the low flow velocity of the present invention is dense
Gasification installation and optical unit are only configured at flue by degree meter, and therefore, operation is easy, and setup cost is the most just
Preferably.
Additionally, do not use the probe tube that internal diameter is less, length is longer, therefore, probe tube blocking etc. is not had to ask
Topic, compared with prior art, can be without keeping in repair and can correctly measure at cigarette in the range of extremely for a long time
Dust concentration in the muddy waste gas of flowing in road.
Accompanying drawing explanation
Even if the light scattering formula dust concentration that the waste gas that Fig. 1 is present invention low flow velocity also can be measured
The schematic diagram of one embodiment of meter.Fig. 1 (A) is even if being the light that also can be measured of the waste gas of low flow velocity
The front portion schematic cross-section of scattering formula dust concentration meter, Fig. 1 (B) is left surface schematic diagram, Fig. 1 (C)
It it is right flank schematic diagram.
Fig. 2 is the schematic cross-section of existing light scattering formula dust concentration meter.
(symbol description)
1 light scattering formula dust concentration meter
1a case
1b flange
Even if the light scattering formula dust concentration meter that the waste gas of 1c flow velocity also can be measured
2 gasification installations
2a the first container
2b inner core
2c path
2d first flow path
2e air bleed hole
2f tilts
2g second flow path
2h air discharge outlet
2i air blast
2k gas curtain
2m second container
2n block
2p packing ring
2q the 3rd stream
2r covers
2s partition
3 instantaneous heater
3a heats light
3b focus
3c sheathed heater
3d terminal
3e thermocouple
4 light illuminators
4a measures light
4b scattered light
5 light scattering detectors
5a optical fiber
6 flues
6a opening
6b flange
6c connecting tube
7 transient heating regions
8 scattering photo detection areas
9 optical units
10 mists
10a mist absorption dust
11 dusts
12 arithmetic units
13 intermittent air blast mechanisms
13a pipe arrangement
13b valve
14 Blast mechanisms
14a pipe arrangement
14b valve
Detailed description of the invention
Hereinafter, with reference to the accompanying drawings, the present invention i.e. light scattering formula dust concentration meter is described in detail.It addition,
The present invention is not limited to following embodiment.
(embodiment 1)
Even if the light scattering formula dust concentration that the waste gas that Fig. 1 is present invention low flow velocity also can be measured
The schematic diagram of one embodiment of meter.Measuring principle is in the following manner: in flue 6, at muddy waste gas stream
Upstream side configuration gasification installation 2 so that mist 10 gasifies, and towards gasification installation 2 downstream irradiate measure
Light 4a, measures dust concentration with light scatter intensity.It addition, the left hollow arrow in Fig. 1 is muddy waste gas
Flow direction, is the upstream of muddy waste gas on the right side of Fig. 1, and left side is the downstream of muddy waste gas.
Even if as it is shown in figure 1, the waste gas that an example of embodiment of the present invention is low flow velocity also can be surveyed
Fixed light scattering formula dust concentration meter 1c includes gasification installation 2, optical unit 9, arithmetic unit 12 and uses
In the various Blast mechanisms of conveying air, wherein, above-mentioned optical unit 9 includes light illuminator 4, scattered light
Detector 5 and receive the second container 2m of above-mentioned light illuminator 4, light scattering detector 5.Additionally, relatively
In the flowing from upstream to downstream of muddy waste gas, gasification installation 2, light illuminator 4 and light scattering detector
The optical unit 9 of 5 is configured in flue 6 successively.
Thereby, the probe tube drawing muddy waste gas from flue 6 outwardly need not be set, even if the stream of muddy waste gas
Move as low speed (below 2m/sec), also can not be affected ground by mist 10, to be in flue 6 dew point with
Lower and dust 11 (little zero) and mist 10 (big zero), mist absorption dust 10a (bilayer zero) coexist
The concentration of the dust 11 in muddy waste gas detects.Certainly, the flowing of muddy waste gas is high speed (10m/sec
Left and right) in the case of, also can be measured.That is, the present invention is the full flow velocity correspondence type of muddy waste gas.
Gasification installation 2 is by the first container 2a, inner core 2b, sheathed heater 3c, lid 2r and intermittent air blast
Mechanism 13 is constituted.
First container 2a has the through hole towards left and right side opening in inside, and from boring a hole in the hole of flue 6
It is inserted into the inside of flue 6 and is fixed.The intake side i.e. through hole of the muddy waste gas of the first container 2a
The inner side of edge of inner side become cut more inclination 2f.Inner core 2b and sheath it is built-in with in inside
Heater 3c, the covered 2r in bottom surface close, and with lid 2r locking with flue 6, thus maintain cover 2r and
The air-tightness of flue 6.
It addition, the interior by the intake side of muddy waste gas at the first container 2a is equipped with for interval
First flow path 2d that air flows through, with the air of the inclination 2f of the semi-circular portions that many is arranged in above-mentioned edge
Bleed hole 2e connects, and makes air blast 2i spray with intermittent air.
Air blast 2i is utilized to make condensation be dried in the mist 10 of the through hole of the intake side of muddy waste gas.By inciting somebody to action
The inner side of above-mentioned through hole is set to tilt 2f, mist 10 and air blast 2i and flows to outside from the first container 2a.
Thereby, the intake side at the muddy waste gas of the first container 2a will not be accumulated because of the row of mist 10 condensation
Sluice.
Additionally, the sidewall inwall at the outlet side of the muddy waste gas of the first container 2a is equipped with all the time for air
Second flow path 2g flow through, the air discharge outlet worn with the end of the sidewall of the outlet side along muddy waste gas
2h connects, so that air is towards the downstream direction ejection of muddy waste gas stream, and will maintain via gasification installation 2
And make the state that mist 10 gasifies region (air-flow) and not via gasification installation 2 muddy waste gas separately,
Isolation, to prevent mist 10 to be mixed into scattering photo detection area 8, it is thus possible to do not formed with affecting by mist 10
For the gas curtain 2k that scattered light 4b is detected.
As shown in Fig. 1 (A), air discharge outlet 2h makes with the U-shaped along the end of the first container 2a
Even if end arrives second container 2m and is scattered with multiple hole in the way of surrounding path 2c, also in linear
Be equipped with an opening.That is, gas curtain 2k forms insulating space on second container 2m.
Even if the flowing of muddy waste gas is low speed, gas curtain 2k also can be utilized to prevent the muddiness of non-mensuration object from giving up
The mist 10 of gas, mist absorption dust 10a is mixed into scattering photo detection area 8, it is thus possible to not by mist 10
Scattered light 4b based on dust concentration is detected by impact ground.
It addition, before using gas curtain 2k, in order to scattering photo detection area 8 and muddy waste gas are separated,
Isolation, makes metallic cylinder extend to the downstream of gasification installation 2, then, utilize optical unit 9 to detect ash
Dust concentration, but measure the covered reflection of light 4a, it is scattered photodetector 5 as diffuse-reflectance and detects, measure
Value changes.Accordingly, as the replacement of lid, by making air from gasification installation 2 towards downstream flow all the time
Form gas curtain 2k, successfully gasification zone is separated with muddy waste gas, isolates.If gas curtain 2k,
The most do not have being mixed into of muddy waste gas, there will not be the reflection measuring light 4a, it is thus possible to examine by scattered light 4b
Measure correct dust concentration.
Inner core 2b is to include that in flue 6 the muddy waste gas with other separates and supply to measure object muddiness waste gas
The metal cylinder of the path 2c of flowing, and solid in the way of consistent with the opening of the left and right of the first container 2a
Inside due to the first container 2a.It is wound with sheathed heater 3c in the periphery of inner core 2b.At inner core 2b
Path 2c in, mist 10 gasifies because of the heat of sheathed heater 3c.Mist 10 after gasification is from ash
Dirt 11 separates, and within one period of period, mist 10 will not be adsorbed in dust 11 again.
In the positive downstream of the muddy waste gas stream of gasification installation 2, because of gas curtain 2k separately, buffer action and not
Being mixed into of the mist 10 that contains in the muddy waste gas in non-thermal region can be produced, additionally, also will not be thin because of gasification
The condensation of mist and adsorb again towards dust 11, it is thus possible to maintain only have mist 10 gasify and under state after separating
Dust 11 exist region.
Sheathed heater 3c is wound in the periphery of inner core 2b, and energising terminal 3d is positioned at the first container 2a (lid
Outside 2r).The outside of sheathed heater 3c is covered by partition 2s, prevents and the contacting of muddy waste gas,
And improve the thermal efficiency.In order to measure, control the temperature of sheathed heater 3c, at inner core 2b and partition
Thermocouple 3e it is configured with between 2s.
Intermittent air blast mechanism 13 is by air supply source (not shown), by above-mentioned air supply source and first-class
Road 2d connection pipe arrangement 13a and be located at pipe arrangement 13a electromagnetic valve 13b constitute.Electromagnetic valve 13b according to
The program of timer or the storage part that is stored in arithmetic unit 12 utilizes the CPU of arithmetic unit to carry out opening and closing control
System.Such as, opened an electromagnetic valve 13b by the instruction of CPU by 15 minutes, carry out the air blast of 10 seconds
2i, makes the condensation of mist 10 dispel or is dried, to prevent dust 11 towards the muddy waste gas of gasification installation 2
The part attachment of intake side.
Air blast 2i can produce impact to dust detected value, and therefore, the moment of CPU and air blast 2i interlocks, will
The detected value of dust 11 before air blast 2i just starts is stored in storage device, as air blast in display part
Mensuration concentration in 2i is shown, to eliminate the impact on instruction continuously.
Optical unit 9 is by the second container 2m in the downstream being positioned at the first container 2a, light illuminator 4, scattering
Photodetector 5, Blast mechanism 14 are constituted.
Second container 2m is accommodated with light illuminator 4 and light scattering detector 5 in inside, and relative to muddiness
The flowing of waste gas is positioned at the downstream of gasification installation 2.Herein, second container 2m and the first container 2a is continuously
Formed, and closed by the lid 2r shared with the first container 2a.Light illuminator 4 and light scattering detector 5 quilt
Block 2n is fixed in second container 2m.Packing ring 2p is there is between second container 2m and block 2n, with
Keep air-tightness.
It is communicated to gas curtain it addition, be formed between block 2n and light illuminator 4 and light scattering detector 5
The 3rd stream 2q in 2k, flow air all the time, prevents the drain water produced because of the condensation of mist 10
Lodge in light-projecting portion and light accepting part, dust 11 adheres to, accumulates in drain water.
Light illuminator 4 using measure light 4a as diffusion light expose to gasification installation 2 relative to muddy waste gas
The gas curtain 2k being positioned at downstream of stream only has a part (the scattering photo detection area in the region that dust 11 exists
8 (regions of reporting to the leadship after accomplishing a task in Fig. 1)), this measurement light 4a is for the scattering measuring basis as dust concentration
Light 4b detects.Now, as long as irradiating the measurement light 4a detected with certain Wavelength synchronous.
Light scattering detector 5 is eliminated the dust 11 of mist 10 to measuring light 4a via gasification installation 2
Scattered light 4b reflected and scatter detects.
Although it addition, scattering photo detection area 8 is adjacent with not muddy exhaust gas region via gasification installation 2,
But owing to being cut off by gas curtain 2k, thus without mixing not via the muddy waste gas of gasification installation 2, if irradiating
The measurement light 4a detected with certain Wavelength synchronous, then scatter because of the dust 11 of scattering photo detection area 8
Scattered light 4b and because of not via the mist 10 in the muddy waste gas of gasification installation 2, mist absorption dust 10a
And the scattered light scattered becomes the scattered light of different wave length, accordingly, it is capable to utilize light scattering detector 5 to be known
Not.
Even if it addition, never generating and from scattering via the muddy waste gas that is adjacent or that be mixed into of gasification installation 2
The scattered light of scattered light 4b phase co-wavelength that photo detection area 8 produces, is also extremely low amounts, additionally,
The light intensity of scattering photo detection area 8 is extremely strong, accordingly, it is capable to ignore the scattered light from above-mentioned muddy waste gas
Light quantity.
Blast mechanism 14 is by air supply source (not shown), by above-mentioned air supply source and second flow path 2g
And the 3rd stream 2q connection pipe arrangement 14a and be located at pipe arrangement 14a electromagnetic valve 14b constitute.Air supplies
It is watertight aircase or air pump etc. to source.Air flows all the time in second flow path 2g and the 3rd stream 2q, because of
This, electromagnetic valve 14b is typically open.When needing repairing etc., excitation is to close electromagnetic valve 14b.
Arithmetic unit 12 is by the light of scattered light 4b according to the scattered light 4b relation proportional to dust concentration
Intensity calculates the device of dust concentration.Such as, if the proportionate relationship of pre-made dust concentration and light quantity
Detection line, then can be obtained the dust concentration of the light quantity relative to scattered light 4b detected by above-mentioned detection line.
It addition, arithmetic unit 12 and light scattering detector 5 can also be integrated.Herein, have employed arithmetic unit
12 by the way of optical fiber 5a receives scattered light intensity signal.
Industrial utilizability
Even if the light scattering formula dust concentration meter that the waste gas of the low flow velocity of the present invention also can be measured can letter
Single and be installed on existing flue at low cost.Further, since be following full flow velocity correspondence type: even if muddy
The flowing of waste gas is low speed, also will not be affected by other mist, can directly in flue continuously and
The most only the dust in the muddy waste gas below the dew point of difficulty so far is measured, therefore, logical
Higher by property, reliability, it is provided that and there is uneasiness and live people's work to whether exceeding reference value for muddy waste gas
For evidence.Additionally, white cigarette Prevent countermeasures also can be flexibly applied to.Accordingly, it is capable to expect in the skill that waste gas measures
Art field, industry are made contributions significantly.
Claims (6)
1. the light scattering formula dust concentration meter that even if the waste gas of low flow velocity also can be measured, not
Mist in flue and dust adsorption, the muddy waste gas that coexists are attracted sampling to outside described flue, but
The dust concentration in muddy waste gas is directly measured in described flue, it is characterised in that
It is made up of gasification installation, Blast mechanism, light illuminator, light scattering detector, arithmetic unit, wherein,
After described gasification installation will measure the separation of object muddiness waste gas in described flue, make described mensuration object muddy
Mist gasification in turbid waste gas, described Blast mechanism makes gas curtain be formed at described gasification installation downstream, this gas curtain
By the region of state maintaining mist to gasify via described gasification installation with not via described gasification installation
Separately, described light illuminator is towards the area illumination of the gasification of described mist in described gas curtain for described muddy waste gas
Light, described light scattering detector described light is removed mist after dust reflection and the scattered light that formed is carried out
Detection, described arithmetic unit is obtained described muddy based on the scattered light intensity detected by described light scattering detector
Dust concentration in turbid waste gas.
2. the light scattering formula ash that even if the waste gas of low flow velocity as claimed in claim 1 also can be measured
Dust concentration meter, it is characterised in that
Described gasification installation is made up of inner core, sheathed heater and the first container, wherein, including described inner core
Portion includes path and left and right side opening, and this path is for measuring muddy along in described flue of object muddiness waste gas
Turbid waste gas stream passes through, and described sheathed heater is wound in the periphery of described inner core, and institute received by described first container
State inner core and sheathed heater,
Described first container is fixed on inside described flue.
3. the light scattering formula ash that even if the waste gas of low flow velocity as claimed in claim 2 also can be measured
Dust concentration meter, it is characterised in that
Described gas curtain is formed towards the air of the downstream ejection of muddy waste gas stream all the time by from described first container.
4. the light scattering that even if the waste gas of low flow velocity also can be measured as claimed in claim 2 or claim 3
Formula dust concentration meter, it is characterised in that
Described light illuminator and light scattering detector are accommodated in the second appearance arranged that is connected with described first container
Device, is formed above described gas curtain at described second container.
Even if the waste gas of the low flow velocity 5. as according to any one of Claims 1-4 also can be measured
Light scattering formula dust concentration meter, it is characterised in that
Intake side spray towards the muddy waste gas of described gasification installation goes out the air blast having interval.
Even if 6. an assay method for the dust concentration that the waste gas of low flow velocity also can be measured, not
Mist in flue and dust adsorption, the muddy waste gas that coexists are attracted sampling to outside described flue, but
The dust concentration in described muddy waste gas is directly measured in described flue, it is characterised in that
After measuring the separation of object muddiness waste gas in described flue, make in described mensuration object muddiness waste gas
Mist gasification,
Form the region of the state gasified by maintenance mist and described muddy waste gas via described gasification installation
Separate gas curtain,
Towards maintaining the area illumination light of mist vaporized state in described gas curtain,
The scattered light after dust scattering after described light is removed mist detects,
The dust concentration in described muddy waste gas is obtained by the scattered light intensity detected.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2015117056A JP5976885B1 (en) | 2015-06-09 | 2015-06-09 | Light scattering dust densitometer capable of measuring even low-flow exhaust gas and dust concentration measuring method |
| JP2015-117056 | 2015-06-09 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106248628A true CN106248628A (en) | 2016-12-21 |
| CN106248628B CN106248628B (en) | 2019-03-26 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510670300.5A Active CN106248628B (en) | 2015-06-09 | 2015-10-13 | Light scatters the measuring method of formula dust concentration meter and dust concentration |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JP5976885B1 (en) |
| CN (1) | CN106248628B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112368564A (en) * | 2018-11-26 | 2021-02-12 | 株式会社田中电气研究所 | Light scattering type dust concentration meter for white turbid waste gas |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| MX2017003104A (en) | 2014-09-10 | 2017-08-15 | Nakagawa Special Steel Inc | Method for cleaning wire and device therefor. |
| JP2020085663A (en) * | 2018-11-26 | 2020-06-04 | 株式会社田中電気研究所 | Light scattering type dust concentration meter for white turbid exhaust gas |
| KR102413574B1 (en) * | 2022-02-16 | 2022-06-27 | 주식회사 다산에스엠 | Improved chimney dust measuring device |
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Also Published As
| Publication number | Publication date |
|---|---|
| CN106248628B (en) | 2019-03-26 |
| JP2017003401A (en) | 2017-01-05 |
| JP5976885B1 (en) | 2016-08-24 |
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