CN107976403A - SO in a kind of real time on-line monitoring flue gas3The device and method of gas concentration - Google Patents
SO in a kind of real time on-line monitoring flue gas3The device and method of gas concentration Download PDFInfo
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Abstract
The invention discloses SO in a kind of real time on-line monitoring flue gas3The device of gas concentration, light source, collimation lens, gas absorption cell, condenser lens, light electric explorer and data processing equipment are sequentially arranged from left to right, the top inner wall of the gas absorption cell is equipped with first electrode, the bottom interior wall of the gas absorption cell is equipped with second electrode, and the first electrode and second electrode are connected with power supply.Beneficial effects of the present invention：Inhomogeneous field is coupled into gas absorption cell, makes SO2And H2O molecules are enriched in the big region of electric field strength, so as to reach and SO3The separated effect of gas, utilizes SO in flue gas under corresponding wave band of laser scanning inhomogeneous field environment3Gas sorption features peak, obtains the absorption spectrogram of the gas high-fineness, using related art methods such as TDLAS to SO3Gas carries out high-precision on-line analysis.
Description
Technical field
The present invention relates to gas real-time online to test and analyze technical field, it particularly relates to a kind of real time on-line monitoring
SO in flue gas3The device and method of gas concentration.
Background technology
From since the " 12th Five-Year Plan ", with the increasingly raising of discharged nitrous oxides control standard, denitration technology is in fired power generating unit
In be generally used, wherein selective catalytic reduction（SCR）Technology denitration efficiency highest, it has also become current efficiently control nitrogen oxidation
The first choice of thing discharge.However, the commercial catalyst used during SCR technology can also result in SO in flue gas2It is converted into SO3, carry
SO in high flue gas3Content.In addition, part sulphur can also be oxidized to SO in coal combustion process3.So coal-burning power plant
SO in pollutant3Discharge capacity it is larger, it should cause enough attention.
SO3Harm mainly have it is following some：（1）SO3Flue gas acid dew point can be caused to raise, exhaust gas temperature and air preheat
The temperature rise of device outlet, reduces boiler thermal efficiency；（2）In SCR reaction process, SO3With excessive NH3Reaction generation sulfuric acid
Ammonium and ammonium hydrogen sulfate, the micropore on both materials meeting blocking catalyst surface, shorten its service life, SCR device are produced negative
Face is rung；（3）SO3It is discharged into air and directly contributes Acid Rain Pollution；（4）SO3Condensation forms H after absorbing water2SO4Aerosol,
This aerosol inherently PM 2.5.Moreover, sulfuric acid aerosol enters after air, and the cation in air, such as
Ammonium ion, generates sulfate aerosol, these aerosols are all secondary PM 2.5, become the important composition of PM 2.5 in air
Part, directly results in the appearance of haze weather.At present, countries in the world are not also on SO in coal-burning power plant3The restriction of discharge capacity
Standard, but the developed country such as U.S. has begun to pay attention to the discharge and influence of the pollutant.With Domestic Environment problem
Day is more prominent, and substantial amounts of SCR device can be installed in coal-burning power plant.At that time, SO3The problem of environmental pollution brought will be brighter
It is aobvious, it is believed that China can be formulated on coal-burning power plant SO in the near future3The relevant criterion of discharge.Therefore, high accuracy, height are developed
Sensitivity and the online SO of high stability3Gas on-line monitoring equipment is very urgent.
At present, there is SO in on-line monitoring flue gas3The patent of invention of gas is fewer, and wherein patent publication No. is
The patent of invention of CN103472061A discloses a kind of real-time online detection SO3The method of gas concentration, this method are based on chemistry
Displacement reaction and spectrophotometry, due to there is longer liquid line in this method, and need SO3It is transformed into SO4 2-After carry out
Chemical reaction, so monitoring SO on-line using this method3Gas not only grow by the response time, but also the more meanings of measured value are average
It is worth, not real time data truly, to changing violent SO3Concentration-response is insensitive.
Diode laser absorption spectrum（TDLAS）Technology is that developed recently, advanced, contactless gas exist
Line detection technique, it uses the absorption line of the narrow laser scanning under test gas molecule of very bandwidth, then by analyzing by gas
Laser intensity after molecule absorption obtains the temperature and concentration of under test gas.Compared with traditional gas detection technology, TDLAS skills
Art can not only realize contactless online real-time in-situ measurement, but also have high wavelength selectivity（Can accurately it select point
Sub certain absorption line）, high sensitivity, some measurable zone gas concentration average level the advantages that, it has also become current gas
One of important development direction of concentration online measuring technique, especially there is important application in terms of atmosphere environment supervision.SO3
Gas molecule is in 1400 cm-1Infrared band has very strong absorption in nearby, utilizes the wave band narrow linewidth, high-power amount
Qc laser（QCL）As light source, with reference to TDLAS technologies, it is dense that the high SO3 gases of accuracy can be obtained theoretically
Degree.However, SO in the coal-fired flue-gas of fired power generating unit discharge3The relative amount of gas is relatively low, only about 5 ppm, H2O and SO2's
Content is of a relatively high, has respectively reached 10% and 500 ppm or so.Again due to SO3Absorption spectrum and H2O、SO2Molecule is 1400
cm-1Conventional method separation H is difficult to be utilized there are sizable overlapping in neighbouring wave band2O、SO2Molecule, so utilizing
TDLAS technology for detection SO3The detection of concentration is always difficult point.
The problem of in correlation technique, not yet propose effective solution at present.
The content of the invention
For the above-mentioned technical problem in correlation technique, the present invention proposes SO in real time on-line monitoring flue gas3Gas concentration
Device and method, can realize to SO3Gas carries out the real-time detection of high accuracy, high sensitivity and high stability exactly.
To realize above-mentioned technical purpose, the technical proposal of the invention is realized in this way：
SO in a kind of real time on-line monitoring flue gas3The device of gas concentration, is sequentially arranged light source, collimation lens, gas from left to right
Body absorption cell, condenser lens, light electric explorer and data processing equipment, the top inner wall of the gas absorption cell are equipped with the first electricity
Pole, the bottom interior wall of the gas absorption cell are equipped with second electrode, and the first electrode and second electrode are connected with power supply electricity
Source.
Wherein, electrode material can be any conductor material, including copper, iron, aluminium etc..Data processing equipment can be included
Computer, microcontroller etc. can arbitrarily carry out the equipment that data calculate processing.
Further, the first electrode and second electrode can produce inhomogeneous field environment after being powered.Electrode shape
It can have any shape, including needle-shaped, tabular, stepped etc., as long as inhomogeneous field environment can be produced.
Further, the gas absorption cell left side wall is equipped with light inlet, and the gas absorption cell right side wall is equipped with
Light-emitting window.The window material of light inlet and light-emitting window includes any material transparent window such as glass, quartz, calcirm-fluoride.
Further, the gas absorption cell is equipped with air inlet and gas outlet.
Further, the light source is the device of any energy radiated electromagnetic wave.Light source is light emitting diode, xenon lamp, laser
Device etc. is arbitrarily capable of the device of radiated electromagnetic wave；The collimated lens of light of light source transmitting enter in gas absorption cell.
Further, the smooth electric explorer can detect the device of optical signal to be any, but be silicon photocell, photomultiplier transit
Pipe etc. can arbitrarily detect the device of optical signal；After the light line focus lens in gas absorption cell out, photodetection is focused on
On device.
Further, the power supply can provide 0 ~ 500 kv direct currents or alternating voltage.
A kind of another aspect of the present invention, there is provided SO in real time on-line monitoring flue gas3The method of gas concentration, including it is as follows
Step：
S1., gas absorption cell is set, first electrode is set in the top inner wall of the gas absorption cell, is absorbed in the gas
Second electrode is set in the bottom interior wall in pond, under test gas is entered gas absorption cell, first electrode and second electrode are powered；
S2. open light source, make light successively by collimation lens calibration, gas absorption cell scanning SO3Gas sorption features peak, gather
Focus lens are incident to light electric explorer after focusing on；
S3. the sensed data of light electric explorer is transferred to data processing equipment to SO3Gas carries out high accuracy analysis.
The present invention operation principle be：SO3It is plane triangular structure, belongs to nonpolar molecule, positive and negative charge center of gravity
Overlap, there is no intrinsic electric dipole moment；H2O and SO2It is V-type molecule, belongs to polar molecule, positive and negative charge center of gravity is misaligned, deposits
In intrinsic electric dipole moment.The present invention is exactly to utilize the dielectrophoresis effect of opposed polarity molecule in inhomogeneous field different, is reached
Separate the purpose of gas.Additional inhomogeneous field has the advantages that untouchable, controllable ability is strong, is very suitable for inhaling with gas
Receives pond is coupled, and multi_layer extraction operation is carried out to pool gas.So inhomogeneous field is coupled into gas absorption cell, can
Effectively make SO2And H2O molecules are enriched in the big region of electric field strength, so as to reach and SO3The separated effect of gas.Utilize phase
Answer the SO in coal-fired flue-gas under wave band of laser scanning inhomogeneous field environment3Gas sorption features peak, obtains the gas fine
The absorption spectrogram of degree, using related art methods such as TDLAS, is realized to SO3 concentration high accuracy real time on-line monitorings.
Dielectrophoresis effect is referred in inhomogeneous field, since the positive and negative charge at electric dipole both ends is respectively at
Electric field E in, so power suffered by the molecule and uneven, the direction made a concerted effort is the big direction of electric field strength, so molecule meeting
Move in the direction big to electric field strength.Either polarity or nonpolar molecule, place it in electric field, can all produce in various degree
Polarization, generate electric dipole.Wherein polar molecule is orientation polarization；Nonpolar molecule is displacement polarization, it polarizes
Intensity is far smaller than the orientation polarization of polar molecule, can be ignored.In the electric field, electric field force suffered by molecule is,
For dielectric, caused polarization charge, E are the intensity of field strength to wherein q in the electric field.
Beneficial effects of the present invention：Inhomogeneous field is coupled into gas absorption cell, makes SO2And H2O molecules are enriched in electricity
The big region of field intensity, so as to reach and SO3The separated effect of gas, inhomogeneous field environment is scanned using corresponding wave band of laser
SO in lower flue gas3Gas sorption features peak, obtains the absorption spectrogram of the gas high-fineness, utilizes the correlation technique hand such as TDLAS
Section is to SO3Gas carries out high-precision on-line analysis.
Brief description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will be to institute in embodiment
Attached drawing to be used is needed to be briefly described, it should be apparent that, drawings in the following description are only some implementations of the present invention
Example, for those of ordinary skill in the art, without creative efforts, can also obtain according to these attached drawings
Obtain other attached drawings.
Fig. 1 is SO in a kind of real time on-line monitoring flue gas of the present invention3The structure diagram of the device of gas concentration.
In figure：1. gas absorption cell；2. light source；3. first electrode；4. second electrode；5. smooth electric explorer；6. data processing
Equipment；7. power supply；8. collimation lens；9. condenser lens；10. light inlet；11. light-emitting window.
Embodiment
Below in conjunction with the attached drawing in the embodiment of the present invention, the technical solution in the embodiment of the present invention is carried out clear, complete
Site preparation describes, it is clear that described embodiment is only part of the embodiment of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, those of ordinary skill in the art's all other embodiments obtained, belong to what the present invention protected
Scope.
As shown in Figure 1, SO in a kind of real time on-line monitoring flue gas according to embodiments of the present invention3The dress of gas concentration
Put, be equipped with light source 2, gas absorption cell 1, light electric explorer 5 and data processing equipment 6, the gas absorption cell 1 successively from left to right
Top inner wall be equipped with first electrode 3, the bottom interior wall of the gas absorption cell 1 is equipped with second electrode 4, power supply 7
Power for the first electrode 3 and second electrode 4.
For the light of regulation light source 2, collimation lens 8 is equipped between light source 2 and the gas absorption cell 1, in order to obtain
More sensitive optical signal data, is equipped with condenser lens 9 between gas absorption cell 1 and the smooth electric explorer 5.
The specially triangle of first electrode 3, the specially rectangle of second electrode 4, first electrode 3 and second electrode after energization
4 can produce inhomogeneous field environment.
1 left side wall of gas absorption cell is equipped with light inlet 10, and 1 right side wall of gas absorption cell is equipped with light-emitting window 11.
Gas absorption cell 1 is equipped with air inlet and gas outlet.
Inhomogeneous field environment is generated after being powered due to first electrode 3 and second electrode 4, gas to be detected enters gas
After absorption cell 1, SO2And H2O molecules are enriched in the both sides up and down in the big region of electric field strength, i.e. gas absorption cell 1, and SO3Gas
Then at middle part, so that by SO2And H2O and SO3Separation, the collimated lens 8 in Guangxin that light source 2 projects are calibrated, entered from light inlet 10
Gas absorption cell 1, scans SO3Gas sorption features peak, is projected from light-emitting window 11, and line focus lens 9 focus on light electric explorer 5
On, signal is transmitted to data processing equipment 6 and SO is calculated by light electric explorer 53Concentration.
Example one
Using SO in above-mentioned real time on-line monitoring flue gas3The apparatus and method of gas concentration are to certain power plant's denitration exit SO3It is dense
Degree is measured, and unit load maintains 300 MW.Absorption cell applies 10 kV AC high voltages, using needle plate electrode.Optics
Analysis module is adopted using 7.16 μm of quantum cascade laser lasers and corresponding detector, the signal of photodetector by data
Truck gathers, and signal is finally handled by Labview programs.Detect under the operating mode, SO3Mean concentration is 21.57 mg/
Nm3.Using national standard《Coal-fired flue gas desulfurization equipment performance test method-GB/T21508-2008》In method obtain SO3Concentration
For 21.35 mg/Nm3。
Embodiment two
Using SO in above-mentioned real time on-line monitoring flue gas3The apparatus and method of gas concentration are to certain power plant's denitration exit SO3It is dense
Degree is measured, and unit load maintains 200 MW.Absorption cell applies 100 kV AC high voltages, using needle plate electrode.Light
Learn analysis module and use 7.16 μm of quantum cascade laser lasers and corresponding detector, the signal of photodetector is by data
Capture card gathers, and signal is finally handled by Labview programs.Detect under the operating mode, SO3Mean concentration is 15.21
mg/Nm3.Using national standard《Coal-fired flue gas desulfurization equipment performance test method-GB/T21508-2008》In method obtain SO3It is dense
Spend for 15.02 mg/Nm3。
Embodiment three
Using SO in above-mentioned real time on-line monitoring flue gas3The apparatus and method of gas concentration are to certain power plant's denitration exit SO3It is dense
Degree is measured, and unit load maintains 300 MW.Absorption cell applies 10 kV AC high voltages, using column plate electrode.Optics
Analysis module is adopted using 7.16 μm of quantum cascade laser lasers and corresponding detector, the signal of photodetector by data
Truck gathers, and signal is finally handled by Labview programs.Detect under the operating mode, SO3Mean concentration is 21.65 mg/
Nm3.Using national standard《Coal-fired flue gas desulfurization equipment performance test method-GB/T21508-2008》In method obtain SO3Concentration
For 21.34 mg/Nm3。
Example IV
Using SO in above-mentioned real time on-line monitoring flue gas3The apparatus and method of gas concentration are to certain power plant's denitration exit SO3It is dense
Degree is measured, and unit load maintains 300 MW.Absorption cell applies 50 kV DC high-voltages, using needle plate electrode.Optics
Analysis module uses 7.50 μm of quantum cascade laser lasers and corresponding detector, and the signal of photodetector is by data
Capture card gathers, and signal is finally handled by Labview programs.Detect under the operating mode, SO3Mean concentration is 21.87
mg/Nm3.Using national standard《Coal-fired flue gas desulfurization equipment performance test method-GB/T21508-2008》In method obtain SO3It is dense
Spend for 21.55 mg/Nm3。
As it can be seen that use SO in real time on-line monitoring flue gas of the present invention3The apparatus and method detection knot of gas concentration
Fruit precision is very high, with national standard detection method result without obvious gap, is very suitable for promoting and applying.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all essences in the present invention
With within principle, any modification, equivalent replacement, improvement and so on, should all be included in the protection scope of the present invention god.
Claims (8)
- A kind of 1. SO in real time on-line monitoring flue gas3The device of gas concentration, it is characterised in that be sequentially arranged light source from left to right （2）, collimation lens（8）, gas absorption cell（1）, condenser lens（9）, light electric explorer（5）And data processing equipment（6）, the gas Body absorption cell（1）Top inner wall be equipped with first electrode（3）, the gas absorption cell（1）Bottom interior wall be equipped with second Electrode（4）, the first electrode（3）And second electrode（4）It is connected with power supply（7）.
- 2. SO in a kind of real time on-line monitoring flue gas according to claim 13The device of gas concentration, it is characterised in that institute State first electrode（3）And second electrode（4）Inhomogeneous field environment can be produced after energization.
- 3. SO in a kind of real time on-line monitoring flue gas according to claim 13The device of gas concentration, it is characterised in that institute State gas absorption cell（1）Left side wall is equipped with light inlet（10）, the gas absorption cell（1）Right side wall is equipped with light-emitting window （11）.
- 4. SO in a kind of real time on-line monitoring flue gas according to claim 13The device of gas concentration, it is characterised in that institute State gas absorption cell（1）It is equipped with air inlet and gas outlet.
- 5. SO in a kind of real time on-line monitoring flue gas according to claim 13The device of gas concentration, it is characterised in that institute State light source（2）For the device of energy radiated electromagnetic wave.
- 6. SO in a kind of real time on-line monitoring flue gas according to claim 13The device of gas concentration, it is characterised in that institute State light electric explorer（5）For the device of optical signal can be detected.
- 7. SO in a kind of real time on-line monitoring flue gas according to claim 13The device of gas concentration, it is characterised in that The power supply（7）0 ~ 500 kv direct currents or alternating voltage can be provided.
- A kind of 8. SO in real time on-line monitoring flue gas3The method of gas concentration, it is characterised in that include the following steps：S1., gas absorption cell is set（1）, in the gas absorption cell（1）Top inner wall on first electrode is set（3）, institute State gas absorption cell（1）Bottom interior wall on second electrode is set（4）, under test gas is entered gas absorption cell（1）, the first electricity Pole（3）And second electrode（4）It is powered；S2. open light source（2）, light is passed through collimation lens successively（8）Calibration, gas absorption cell（1）Scan SO3Gas absorbs Characteristic peak, condenser lens（9）Light electric explorer is incident to after focusing（5）；S3. light electric explorer（5）Sensed data be transferred to data processing equipment（6）To SO3Gas carries out high accuracy analysis.
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| CN109211799A (en) * | 2018-11-14 | 2019-01-15 | 国网黑龙江省电力有限公司电力科学研究院 | The method that 980nm wave band of laser measures concentration of SO 2 gas in sulfur hexafluoride gas |
| CN111766341A (en) * | 2020-07-07 | 2020-10-13 | 西安热工研究院有限公司 | Correction method for sulfur trioxide concentration test in industrial waste gas |
| CN113219096A (en) * | 2021-05-07 | 2021-08-06 | 西安圆方环境卫生检测技术有限公司 | Embedded indoor air detector |
| CN114460038A (en) * | 2021-12-31 | 2022-05-10 | 南京星空低碳科技中心(有限合伙) | Device and method for online monitoring of sulfur trioxide concentration |
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| CN107976403B (en) | 2021-01-12 |
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