CN102183482A - Non-disperse infrared multi-component flue gas analyzer - Google Patents
Non-disperse infrared multi-component flue gas analyzer Download PDFInfo
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- CN102183482A CN102183482A CN 201110043686 CN201110043686A CN102183482A CN 102183482 A CN102183482 A CN 102183482A CN 201110043686 CN201110043686 CN 201110043686 CN 201110043686 A CN201110043686 A CN 201110043686A CN 102183482 A CN102183482 A CN 102183482A
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Abstract
The invention discloses a non-disperse infrared multi-component flue gas analyzer. In the non-disperse infrared multi-component flue gas analyzer, a light source with similar black body radiation characteristic is adopted and can cover infrared absorption bands of all component gases to be tested and interfered component gases; high-stability light source emission is realized by designing a voltage-stabilizing and current-stabilizing circuit; an optically filtering wheel is provided, so double effects of optically filtering and modulating light waves are achieved, and stability and measuring accuracy of a system are improved; concentration of various gases in the flue gas can be measured at the same time by reasonably selecting parameters of optical filters; a water vapor measuring channel is introduced on the optically filtering wheel, so an analyzer can work in the damp environment normally; a sample pool adopts a multi-time reflection pool structure, so gas absorption optical distance is increased and detection sensitivity of the system is improved; and the sample pool adopts a heating and temperature control system, so water vapor condensation and combination of the water vapor and acidic gases to be tested such as sulfur dioxide (SO2) and nitrogen dioxide (NO2) are avoided, and measuring accuracy and corrosion resistance of the system are improved.
Description
Technical field
The present invention relates to the automatic monitor for continuously device of the multicomponent gas of pollution source discharging flue gas, be specially a kind of non-dispersion infrared polycomponent flue gas analyzer based on the non-dispersion infrared absorption spectrum.
Background technology
Along with the further raising of industrialization degree, people more and more pay close attention to the influence of air pollution to global environment.The emission of combustion of fossil fuel equipment comprises the dusty gas of number of different types, for example CO usually
2, NO
2, SO
2, CO, NO or the like, because these noxious emissions have potential threat to environment, a lot of countries all monitor dissimilar exhaust gas discharging.For the gas concentration of guaranteeing to discharge meets relevant criterion, people press for the continuous blow-down monitoring system (CEMS, ContinuousEmission Monitoring System) that can be installed on disposal of pollutants source such as power station and the incinerator.
The non-dispersion infrared analytical approach is widely used in the continuous blow-down monitoring system, but there are a series of defectives in common non-dispersion infrared analytical approach, for example, in order to measure the number of different types dusty gas that exists in the stack gas emissions, need move simultaneously a plurality of independently gas analysis systems and (or) measuring table, measurement mechanism may need to move first gas analysis system and survey first type gas, move second gas analysis system and survey gas of second type or the like, the structure of analyser will become very complicated like this, and the fusion of different analytic systems can bring bigger systematic error, increases manufacturing cost.Traditional in addition NDIR non dispersive infrared analyzer comprises a lot of movable parts, is separated from each other as filter wheel and chopper wheel, needs separate drive control logic circuit and electro-motor, and asynchronous meeting each other brings bigger measuring error.
Summary of the invention
The purpose of this invention is to provide a kind of non-dispersion infrared polycomponent flue gas analyzer, to solve the monitoring device complex structure of prior art, the problem that measuring error is big.
In order to achieve the above object, the technical solution adopted in the present invention is:
Non-dispersion infrared polycomponent flue gas analyzer, include repeatedly reflection tank, the controlled smoke mixture to be measured of described repeatedly reflection tank air intake opening input flow rate, it is characterized in that: the light-emitting window place of described repeatedly reflection tank is equipped with infrared eye, also include infrared light supply, by motor-driven rotating optically filtering wheel, the infrared signal of described infrared light supply output wavelength between 1um to 10um, described optically filtering wheel upper edge circumference uniformly-spaced is evenly distributed with a plurality of through holes, be separately installed with optical filter in the through hole and constitute filtering channel, described optical filter sees through the infrared signal of different wave length respectively, the infrared signal of each each self-absorption of component gas of smoke mixture to be measured is corresponding one by one in the infrared signal that optical filter sees through separately and the described repeatedly reflection tank, after the infrared signal of described infrared light supply output is taken turns each optical filter through optically filtering, be incident to repeatedly reflection tank from the light inlet of reflection tank repeatedly, after repeatedly reflection tank repeatedly reflects, be incident to the repeatedly infrared eye at reflection tank light-emitting window place.
Described non-dispersion infrared polycomponent flue gas analyzer is characterized in that: the optical filter that each through hole of described filter wheel is installed is respectively and sees through CO in the smoke mixture to be measured
2The optical filter of absorbent infrared signal light, see through the absorbent infrared signal light of CO in the smoke mixture to be measured optical filter, see through the absorbent infrared signal light of NO in the smoke mixture to be measured optical filter, see through NO in the smoke mixture to be measured
2The optical filter of absorbent infrared signal light, see through SO in the smoke mixture to be measured
2The optical filter of absorbent infrared signal light, see through H in the smoke mixture to be measured
2The optical filter of the absorbent infrared signal light of O, see through in the smoke mixture to be measured 0
2The optical filter of absorbent infrared signal light.
Described non-dispersion infrared polycomponent flue gas analyzer, it is characterized in that: the through hole that also is reserved with one or more blank on the described filter wheel, and one or more reference light through holes, described reference light through hole be equipped with can be by reference light the reference optical filter, the through hole of described blank, reference light through hole, each through hole that is equipped with corresponding to the optical filter of each component gas in the smoke mixture to be measured uniformly-spaced are evenly distributed on the filter wheel.
Described non-dispersion infrared polycomponent flue gas analyzer, it is characterized in that: the through hole corresponding to the filter wheel of some component gas in the smoke mixture to be measured has two, perhaps the through hole corresponding to the filter wheel of part component gas in the smoke mixture to be measured each has two respectively, optical filter through the infrared signal light that corresponding component gas absorbed in the smoke mixture to be measured of high concentration is installed in one of them through hole, the optical filter through the infrared signal light that corresponding component gas absorbed in the smoke mixture to be measured of low concentration is installed in another through hole.
Described non-dispersion infrared polycomponent flue gas analyzer, it is characterized in that: described infrared light supply is made of the light source with class blackbody radiation characteristic, mu balanced circuit, current stabilization circuit, and described light source with class blackbody radiation characteristic produces the infrared signal of broad band by mu balanced circuit, current stabilization circuit.
Described non-dispersion infrared polycomponent flue gas analyzer, it is characterized in that: in the described repeatedly reflection tank heating module and temperature sensor are installed, by the temperature sensor monitors temperature of reflection tank repeatedly, cooperate with temperature sensor by heating module to make repeatedly that reflection tank is operated in temperature constant state.
Described non-dispersion infrared polycomponent flue gas analyzer, it is characterized in that: the inwall of described repeatedly reflection tank scribbles resistant material, repeatedly reflection tank sealing, repeatedly the air intake opening of reflection tank, gas outlet are equipped with the valve that is in communication with the outside, and place, the gas outlet of described repeatedly reflection tank is equipped with the electrochemistry oxygen sensor.
Described non-dispersion infrared polycomponent flue gas analyzer is characterized in that: in the signal acquisition periods,
The maximal value of each filtering channel signal intensity and the ratio of minimum value are in twice under zero background.
The gas that the present invention monitors simultaneously has: CO
2, CO, NO, NO
2, SO
2, H
2O, 0
2The filter wheel of design has played the double action of optically filtering and modulated light wave, and repeatedly reflection tank has increased the absorption light path of gas effectively, and the present invention uses an infrared eye just can finish the measurement of multiple gases; Portion gas is measured and is adopted the dual-channel analysis technology, has both guaranteed the high sensitivity of analyser, has enlarged range of dynamic measurement again; Adopt the constant sample cell temperature of temperature closed loop control method, utilize voltage stabilizing, current stabilization circuit to obtain the high stable light source, realize stable accurate measurement of industrial pollution source emission gases.
Infrared light supply of the present invention adopts the light source with class blackbody radiation characteristic, light source is by voltage stabilizing, current stabilization circuit, produce the infrared signal of broad band, wavelength at 1 μ m between the 10 μ m, can cover the infrared absorption band of all component gas to be measured and interfering component gas, utilize gas molecule to absorb the concentration information that feature obtains gas molecule to be measured at the fundamental frequency " fingerprint " of middle-infrared band.
Optically filtering wheel of the present invention has played the double action of optically filtering and modulated light wave.Comprise on the filter wheel that the filter plate of series of different reaches the purpose of optically filtering with the light signal of filtering different frequency bands, when controller drives the filter wheel rotation, all optical filters alternately are blocked or by photo-signal channel, reach the purpose of modulated light signal.
Measure when the present invention can finish the various ingredients dusty gas,, realize CO by a series of optical filter combinations
2, CO, NO, NO
2, SO
2, H
2Multicomponent gases such as O are measured, and in reflection tank gas outlet repeatedly the electrochemistry oxygen sensor are installed and are finished O in the flue gas
2Measurement.
The cycle that can guarantee each filtering channel light signal that is spacedly distributed of each optical filter equates on the filter wheel of the present invention; With the design of big or small blank unthreaded hole on an equal basis of other optical filter, more help the adjusting of total system light path on the filter wheel; The reference optical filter that designs on the filter wheel is eliminated the fluctuation of hardware better, improves the stability of system.
The present invention is according to the infrared absorption spectrum characteristic of each component gas to be measured, specialized designs H
2The O filtering channel, the optical filter parameter of this filtering channel is through selection meticulously, and the light signal of this filtering channel only reflects H in the analyser environment for use
2The variation of O helps deducting the interference of steam to other component gas to be measured, improves the detection sensitivity and the accuracy of system, and analyser can normally be operated in humidity or the unsettled environment of moisture content.
The present invention repeatedly in the reflection tank eyeglass at the reflectivity of middle-infrared band greater than 99%, light signal comes back reflective between a plurality of spherical reflectors, increase the absorption light path of gas, the detection sensitivity and the accuracy that improve system.
The present invention with smoke mixture suction continuously and stably reflection tank repeatedly, by flow control, can keep repeatedly the stable of air-flow and air pressure in the reflection tank by aspiration pump, the variation of pollutant levels in real time or in the on-line monitoring flue; Repeatedly the reflection tank inwall scribbles resistant material, except air intake opening and gas outlet have valve is in communication with the outside, other parts all seal, and has improved repeatedly serviceable life of reflection tank and safe in utilization.
Heating module and temperature sensor repeatedly are housed on the reflection tank, both are used and make repeatedly that reflection tank is operated in temperature constant state, improve the stability of analytic system on the one hand, avoid under the low temperature especially condensing of steam of gas on the other hand, improve the accuracy in detection of analytic system, can also prevent steam and sour gas (as: SO to be measured
2, NO
2) combination, improve the accuracy of measurement and the corrosion resistivity of system.
In the signal acquisition periods, in order to make the signal intensity of each optical filter under zero gas background unanimous on the whole, take all factors into consideration the influence of optical filter parameter (bandwidth, transmitance), intensity of light source distribution and explorer response ability, the maximal value of each filtering channel signal intensity and the ratio of minimum value are in twice under zero background, help the extraction of each passage absorbance information, make things convenient for data acquisition and data processing.Portion gas adopts two filtering channel analytical technologies, as SO
2Adopt height two passages, both guaranteed the high sensitivity of analyser, enlarge range of dynamic measurement again.
The present invention is simple in structure, compact, have extensibility.Sniffer is with repeatedly reflection tank is mutually integrated, the data input is mutually integrated with data output, optically filtering and light modulated phase of wave are integrated, the temperature heating module is mutually integrated with temperature sensor, simplified system and device, and by changing or adding suitable optical filter, the present invention can also carry out the expansion of other dusty gas and measure.
Characteristics such as that the present invention has is simple in structure, compact, can expand are easy to miniaturization, practicability.Sniffer is with repeatedly reflection tank is mutually integrated, and optically filtering and light modulated phase of wave are integrated, and the temperature heating module is mutually integrated with temperature sensor, has simplified apparatus greatly; And by changing or adding suitable optical filter, analyser can also carry out the measurement or the range of other dusty gas can expand measurement, very convenient, effective.
The present invention compared with prior art has the following advantages:
The present invention can realize that the dusty gas in the flue gas detects, and is one of major technique of flue gas on-line analysis instrument.But existing, conventional art measures the shortcoming that kind is few, dynamic range is little, measuring accuracy is not high.For example, in order to measure the number of different types dusty gas that exists in the stack gas emissions, traditional measurement mechanism may need to move simultaneously a plurality of independently gas analysis systems and (or) measuring table.Also there are a series of defectives in the production method of modulated light wave in addition, and traditional " two-wheeled " gas analysis system comprises an optically filtering wheel and a chopper wheel, and this alanysis instrument is easy to bring measuring error.
Non-dispersion infrared polycomponent flue gas analyzer involved in the present invention can not only be measured the multiple dusty gas (SO in the flue gas pollutant simultaneously
2, NO, CO, CO
2, NO
2, H
2O, O
2), also have simple in structure, compact, characteristics such as can expand, be easy to miniaturization, practicability.Sniffer is with repeatedly reflection tank is mutually integrated, and optically filtering and light modulated phase of wave are integrated, and the temperature heating module is mutually integrated with temperature sensor, has simplified apparatus greatly; And by changing or adding suitable optical filter, analyser can also carry out the measurement or the range of other dusty gas can expand measurement, very convenient, effective; Absorb enhancement techniques by catoptrics repeatedly, improved apparatus measures sensitivity; The single component multichannel analysis technology that adopts had both guaranteed the high detection sensitivity of analyser, had enlarged the range of dynamic measurement of instrument again; Adopt the temperature closed loop method accurately to control the sample cell temperature; Utilize voltage stabilizing, current stabilization circuit to obtain the high stable light source, realized the automatic continuous real-time monitoring of site environment.
Description of drawings
Fig. 1 is a structured flowchart of the present invention.
Fig. 2 is a filter wheel structure principle chart of the present invention.
Fig. 3 is each channel signal intensity map under the present invention's zero gas background.
Embodiment
As shown in Figure 1.A kind of non-dispersion infrared polycomponent flue gas analyzer comprises infrared light supply, optically filtering wheel, repeatedly reflection tank, air-channel system and data analysis system.The light beam that infrared light supply produces enters repeatedly reflection tank by optical filtering apparatus, through repeatedly entering infrared eye after the reflection.The solenoid control sample gas flows to, the constant sample gas flow of flow controller.The data sampling analytic system is divided into preposition amplification, A/D conversion, analyzing and processing three parts.
As shown in Figure 2.Optical filter is installed order: blank unthreaded hole, CO
2, SO
2(low), NO
2, NO, CO, H
2O, with reference to 1, SO
2(height).
The present invention is a kind of portable many components of non-dispersion infrared flue gas on-line analysis instrument.Employing has the light source of class blackbody radiation characteristic, and light source produces the infrared signal of broad band, and wavelength between the 10 μ m, can cover the infrared absorption band of all component gas to be measured and interfering component gas at 1 μ m; By designing unique optically filtering wheel, played the double action of optically filtering and modulated light wave, simplified system architecture, improved system stability and accuracy of measurement; By choose reasonable to the optical filter parameter, designed many optical filter wheels, analyser can be measured the concentration of multiple gases in the flue gas simultaneously, as: CO
2, CO, NO, NO
2, SO
2, H
2O etc., because steam is measured the introducing of passage, analyser can also normally be operated in the wet environment; Sample cell adopts repeatedly reflection tank structure, and light comes back reflective between three spherical mirrors, has increased the gas absorption light path, has improved system's detection sensitivity; Heating system and temperature sensor unite use, can keep the working stability of sample cell on the one hand, can prevent condensing of steam on the other hand, prevent steam and sour gas (as: SO to be measured
2, NO
2) combination, improve the accuracy of measurement and the corrosion resistivity of system.
Adopt repeatedly reflection tank to increase among the present invention and measure light path, improve detection sensitivity.All seal except air intake opening and bleeding point have valve to be in communication with the outside other parts, the chamber mirror is made up of three spherical mirrors, can regulate light path by changing order of reflection; The light that light emitted is come out is the laggard air inlet chamber of halo after filtration, increases light path by repeatedly reflecting between catoptron and the primary mirror, with the sensitivity of raising instrument, and cavity mirrors reflectivity＞99%, light intensity attenuation is very little after repeatedly reflecting.
Comprise on the filter wheel among the present invention that dissimilar filter plates is to filter the light signal of certain frequency band.SO is housed respectively on the filter wheel
2, NO, CO, CO
2, NO
2, H
2Optical filter such as O, reference, the slit on the filter wheel utilize the optocoupler location, determine a sense cycle.
The selection of optical filter parameter among the present invention is according to each component gas: CO
2, CO, NO, NO
2, SO
2, H
2The infrared absorption characteristic of O in order to reduce interchannel cross interference, improves the detection sensitivity of system simultaneously, the parameter of each channel filter is selected, wherein reference: 3.85 μ m, H
2O:2.59 μ m, SO
2(L): 3.98 μ m, SO
2(H): 7.35 μ m, CO:4.6um, CO
2: 4.84 μ m, NO:5.25 μ m NO
2: 6.31 μ m.
The whole monitoring means of the present invention all is installed in repeatedly on the reflection tank, light source, optical filter, detector, form the core detection system, during analyser work, light signal enters sample cell after collimated and filter wheel modulated filter, in reflection tank repeatedly after the gas absorption by another lens focus to the PbSe photoconductive detector, the signal voltage that detector produces is directly proportional with the detection light intensity, according to the light signal strength of detected each frequency band of detector, can inverting the concentration of gas in the reflection tank repeatedly.
Analyser electronics part of the present invention and control section are combined as organic whole.The realization of electronics part relates to Detection of Weak Signals, data processing and computing, control automatically.Comprise infrared electro conversion of signals and analog to digital conversion circuit, White pond temperature-control circuit, solenoid control, electrochemistry oxygen sensor acquisition circuit and light source constant-pressure control.Hardware system is realized data acquisition and preprocessing function, and the further filtering and the calculation process of data are finished by industrial computer software.
The present invention to the inverting of gas concentration based on the Lambert-Beer law.When can finishing the various ingredients dusty gas, measures by analyser, as: CO
2, CO, NO, NO
2, SO
2, H
2O etc., the measurement of these gas concentrations is all based on the non-dispersion infrared absorption spectrum, and it absorbs relation and obeys lambert Bill (Lambert-Beer) law, and is as follows:
Wherein, A is an absorbance, I
0Be the light intensity under the zero gas background, I
sBe the light intensity under the object gas background, α is the absorption coefficient of object gas, and L is the actual absorption length after light signal repeatedly reflects in the White pond, and C is the concentration of object gas.When having the gas of number of different types in the sample gas, formula (1) becomes:
In the formula, α, the absorption coefficient of the different component object gas of representative such as beta, gamma, C
1, C
2, C
3Deng the concentration that is each component object gas.Shown in following formula, langbobier law has provided by the absorbance behind the object gas and the relation of gas concentration.The light signal of dissimilar gas absorption different frequencies after light wave passes sample gas, is determined the type and the concentration of gas to be measured to the absorbance of different frequency light wave according to the sample gas that detects.
Non-dispersive polycomponent flue gas analyzer of the present invention comprises infrared light supply, optical filtering apparatus, air-channel system and circuit control and data sampling analytic system.The light signal that light source produces at first enters filter after collimated, comprise on the filter wheel that the filter plate of series of different reaches the purpose of optically filtering with the light signal of filtering different frequency bands, when the driven by motor filter wheel is rotated, all optical filters alternately are blocked or pass through photo-signal channel, reach the purpose of modulated light signal, light signal after the filter wheel modulated filter enters repeatedly reflection tank then, the repeatedly emission of gas to be measured enters infrared eye after absorbing at last in reflection tank repeatedly, the absorbance of the different frequency bands that the data sampling analytic system detects according to infrared eye is analyzed repeatedly the gas type and the concentration thereof that exist in the reflection tank.Non-dispersion infrared polycomponent flue gas analyzer specifically composed as follows:
A) light path system
The light wave that the wide range infrared light supply sends enters through optics filter modulation and after considering ripple and repeatedly reflects in the White pond, after reflection-absorption repeatedly, electric signal is accepted and be converted to the infrared signal that carries different fingerprint characteristic information by the chared thermal type infrared eye, detects for subsequent conditioning circuit.
Light source: native system uses borded pile bulk resistor by nickel chromium triangle electrothermal alloy coiled as infrared light supply, and light source is approximately black matrix.The major advantage of nickel chromium triangle electrothermal alloy is: elevated temperature strength is than siderochrome aluminium height, and high temperature uses not yielding down, and its structure is malleable not, and plastic hinge is good, and the radiance height is nonmagnetic, and corrosion resistance is strong, long service life etc.Light source is equipped with accurate power resistor power supply by novel switched power supply, makes it be operated in constant current state, does not change in long-time with the infrared intensity that guarantees to be sent.
In the signal acquisition periods, in order to make the signal intensity of each optical filter under zero gas background unanimous on the whole, be convenient to data acquisition and data processing, take all factors into consideration and consider that transmitance, radiation of light source intensity distributions and explorer response are as can be known in the optical filter bandwidth, the greatest irradiation wavelength of light source should be proper between 4.5 μ m-6 μ m, the maximal value of each channel signal intensity and the ratio of minimum value are in twice under this moment zero background, help the extraction and the analysis of each passage absorbance information, for multicomponent gas is provided by the necessary precondition condition that provides simultaneously.
Optical filter parameter: according to each component gas CO
2, CO, NO, NO
2, SO
2, H
2The infrared absorption characteristic of O simultaneously in order to reduce interchannel cross interference, is selected the parameter of each channel filter.Wherein with reference to 3.85 μ m, H
2O 2.59 μ m, SO
2Low 3.98 μ m, SO
2High 7.35 μ m, CO 4.6um, CO
24.84 μ m, NO 5.25 μ m NO
26.31 μ m.
Reflection tank repeatedly: increased the absorption light path by the repeatedly reflection between three spherical mirrors.
Primary mirror: f=396.3mm aluminize (2-10um)
Catoptron 2 f=396.3mm aluminize (2-10um)
Air cell size: 415mmx72mmx34mm
The light signal of light emitted enters repeatedly reflection tank, increases light path, the sensitivity that improves instrument by repeatedly reflecting between catoptron and the primary mirror.
Filter wheel: comprise on the light filter that dissimilar filter plates is to filter the light signal of certain frequency band.SO is housed on the filter wheel
2, NO, CO, CO
2, NO
2, H
2Optical filter such as O, reference, the slit on the filter wheel utilize the optocoupler location, determine a sense cycle.Optically filtering is taken turns the purpose that the light signal of going up dissimilar filter plate filtering different frequency bands reaches optically filtering, and when controller drove the filter wheel rotation, all optical filters alternately were blocked or by photo-signal channel, reach the purpose of modulated light signal.
Whole detection unit: on reflection tank repeatedly, install light source, filter wheel, detector and detection circuit thereof additional, form the core detection system.
Because flue gas has hot and humid property, corrosivity, and condensation in air chamber easily.Condensation has the influence of two aspects to measurement: owing to contain the gas of melt water in the flue gas, the existence of steam can reduce the concentration of gas in the flue gas, influences measuring accuracy on the one hand.Owing in the air chamber 5 optical mirror slips are arranged, condensate water can corrode eyeglass on the other hand, destroys optical system.The inner spray of system's sample cell Teflon prevents that by flue gas corrosion to gas heating to be measured, pond body temperature degree is controlled at 50 degrees centigrade, avoids portion gas condensation and absorption in air chamber in the flue gas.
B) air-channel system
Built-in barrier film air pump, current limliting aperture and solenoid valve realize that sample cell continues the constant gas sampling, to the controlling of gas circuit, realize the function of on-line calibration and demarcation, by flowmeter constant gas flow by solenoid valve.Whole air-channel system can have corrosion resistivity, can realize long-term, stable operation.
C) Electronic Control and analytic system thereof
Circuits System comprises extremely composition such as slow start-up control circuit of infrared electro conversion of signals and analog to digital conversion circuit, White pond temperature-control circuit, solenoid valve control circuit, electrochemistry oxygen sensor acquisition circuit, light source voltage stabilizing.
The infrared signal detecting plate is mainly realized infrared signal detection, amplification, filtering, is reached the AD sampling.Sampled signal is delivered to the built-in computing system of system (industrial control computer or digital signal processor DSP) and is carried out the data analysis processing, is finally inversed by the concentration of various dusty gass.
The front-end control system comprises: (1) power-supply system: all power supplys of front end system are provided, have comprised digital circuit power supply 5V switch voltage-stabilizing source; ± 15V simulates source of stable pressure; The front end 9V Voltage stabilizing module of detector operate as normal; (2) master control borad: this is the major part of front-end control system, in data acquisition system (DAS), adopts the conversion chip with 16 measuring accuracy, and under motor speed 1500 commentaries on classics/min control, the control system sample frequency is 225Hz.
Be the volume of reduction system, reduction system operation power consumption realizes the portable of system, has designed the embedded computing system based on floating-point signal processor DSP.
4) software systems
The fundamental purpose of non-dispersion infrared polycomponent flue gas analyzer software is that hardware system is controlled, and finishes data acquisition, processing and retrieving concentration, and a concentration value that calculates shown and adds database automatically to.
1, control function
The control instrument inner parameter is as temperature, light source voltage, calibration solenoid valve switch etc.
2, data acquisition and retrieving concentration function
Signal to different passages is gathered, is handled, and by the retrieving concentration algorithm, obtains multi-component concentration value simultaneously.
3, Presentation Function
Show current measure signal intensity, measure concentration, show monitoring gas concentration trend map over time simultaneously.
4, memory function
The concentration value of real-time storage monitoring gas.
Real-time storage original measurement signal intensity.
5, subsidiary function
The inquiry of measurement result, demonstration and output etc.
The system operational parameters management.
Claims (8)
1. non-dispersion infrared polycomponent flue gas analyzer, include repeatedly reflection tank, the controlled smoke mixture to be measured of described repeatedly reflection tank air intake opening input flow rate, it is characterized in that: the light-emitting window place of described repeatedly reflection tank is equipped with infrared eye, also include infrared light supply, by motor-driven rotating optically filtering wheel, the infrared signal of described infrared light supply output wavelength between 1um to 10um, described optically filtering wheel upper edge circumference uniformly-spaced is evenly distributed with a plurality of through holes, be separately installed with optical filter in the through hole and constitute filtering channel, described optical filter sees through the infrared signal of different wave length respectively, the infrared signal of each each self-absorption of component gas of smoke mixture to be measured is corresponding one by one in the infrared signal that optical filter sees through separately and the described repeatedly reflection tank, after the infrared signal of described infrared light supply output is taken turns each optical filter through optically filtering, be incident to repeatedly reflection tank from the light inlet of reflection tank repeatedly, after repeatedly reflection tank repeatedly reflects, be incident to the repeatedly infrared eye at reflection tank light-emitting window place.
2. non-dispersion infrared polycomponent flue gas analyzer according to claim 1 is characterized in that: the optical filter that each through hole of described filter wheel is installed is respectively and sees through CO in the smoke mixture to be measured
2The optical filter of absorbent infrared signal light, see through the absorbent infrared signal light of CO in the smoke mixture to be measured optical filter, see through the absorbent infrared signal light of NO in the smoke mixture to be measured optical filter, see through NO in the smoke mixture to be measured
2The optical filter of absorbent infrared signal light, see through SO in the smoke mixture to be measured
2The optical filter of absorbent infrared signal light, see through H in the smoke mixture to be measured
2The optical filter of the absorbent infrared signal light of O, see through in the smoke mixture to be measured 0
2The optical filter of absorbent infrared signal light.
3. non-dispersion infrared polycomponent flue gas analyzer according to claim 1, it is characterized in that: the through hole that also is reserved with one or more blank on the described filter wheel, and one or more reference light through holes, described reference light through hole be equipped with can be by reference light the reference optical filter, the through hole of described blank, reference light through hole, each through hole that is equipped with corresponding to the optical filter of each component gas in the smoke mixture to be measured uniformly-spaced are evenly distributed on the filter wheel.
4. non-dispersion infrared polycomponent flue gas analyzer according to claim 1, it is characterized in that: the through hole corresponding to the filter wheel of some component gas in the smoke mixture to be measured has two, perhaps the through hole corresponding to the filter wheel of part component gas in the smoke mixture to be measured each has two respectively, optical filter through the infrared signal light that corresponding component gas absorbed in the smoke mixture to be measured of high concentration is installed in one of them through hole, the optical filter through the infrared signal light that corresponding component gas absorbed in the smoke mixture to be measured of low concentration is installed in another through hole.
5. non-dispersion infrared polycomponent flue gas analyzer according to claim 1, it is characterized in that: described infrared light supply is made of the light source with class blackbody radiation characteristic, mu balanced circuit, current stabilization circuit, and described light source with class blackbody radiation characteristic produces the infrared signal of broad band by mu balanced circuit, current stabilization circuit.
6. non-dispersion infrared polycomponent flue gas analyzer according to claim 1, it is characterized in that: in the described repeatedly reflection tank heating module and temperature sensor are installed, by the temperature sensor monitors temperature of reflection tank repeatedly, cooperate with temperature sensor by heating module to make repeatedly that reflection tank is operated in temperature constant state.
7. non-dispersion infrared polycomponent flue gas analyzer according to claim 1, it is characterized in that: the inwall of described repeatedly reflection tank scribbles resistant material, repeatedly reflection tank sealing, repeatedly the air intake opening of reflection tank, gas outlet are equipped with the valve that is in communication with the outside, and place, the gas outlet of described repeatedly reflection tank is equipped with the electrochemistry oxygen sensor.
8. non-dispersion infrared polycomponent flue gas analyzer according to claim 1 is characterized in that: in the signal acquisition periods, the maximal value of each filtering channel signal intensity and the ratio of minimum value are in twice under zero background.
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Cited By (49)
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