CN113310924A - Multi-method-fused flowing fly ash carbon content online measurement system and method - Google Patents
Multi-method-fused flowing fly ash carbon content online measurement system and method Download PDFInfo
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- 239000010881 fly ash Substances 0.000 title claims abstract description 96
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 title claims abstract description 84
- 229910052799 carbon Inorganic materials 0.000 title claims abstract description 84
- 238000000034 method Methods 0.000 title claims abstract description 35
- 238000005259 measurement Methods 0.000 title abstract description 22
- 238000004891 communication Methods 0.000 claims abstract description 13
- 239000002956 ash Substances 0.000 claims abstract description 12
- 230000005540 biological transmission Effects 0.000 claims abstract description 9
- 239000002245 particle Substances 0.000 claims description 60
- 239000000428 dust Substances 0.000 claims description 17
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- 230000002238 attenuated effect Effects 0.000 claims description 3
- 238000012544 monitoring process Methods 0.000 abstract description 3
- 238000001514 detection method Methods 0.000 description 9
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- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 7
- 238000004458 analytical method Methods 0.000 description 7
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- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 2
- 239000003245 coal Substances 0.000 description 2
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- 238000002536 laser-induced breakdown spectroscopy Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
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- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
- G01N21/31—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
- G01N21/35—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light
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- G01N21/41—Refractivity; Phase-affecting properties, e.g. optical path length
- G01N21/45—Refractivity; Phase-affecting properties, e.g. optical path length using interferometric methods; using Schlieren methods
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- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
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- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/47—Scattering, i.e. diffuse reflection
- G01N21/49—Scattering, i.e. diffuse reflection within a body or fluid
- G01N21/53—Scattering, i.e. diffuse reflection within a body or fluid within a flowing fluid, e.g. smoke
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Abstract
The invention discloses a multi-method fused flowing fly ash carbon content online measurement system, which adopts the technical scheme that the system comprises a central control terminal, a shell, a laser detector and an infrared detector, wherein the laser detector and the infrared detector are arranged in the shell, a fly ash channel is arranged in the middle of the shell, the laser detector is used for detecting laser data of carbon ash in the fly ash channel, the infrared detector is used for detecting light transmission data of the carbon ash in the fly ash channel, the central control terminal is respectively used for being in communication connection with the laser detector and the infrared detector, the central control terminal is used for receiving the laser data detected by the laser detector and the light transmission data detected by the infrared detector and calculating the carbon content value, the central control terminal is further provided with a holographic recording module and a holographic reconstruction module, the holographic recording module is used for recording interference and diffraction of laser rays and infrared rays to record interference images, and the holographic reconstruction module is used for reconstructing the interference images to the image information of original objects, the monitoring system has the functions of quick measurement, accurate result, low cost and convenient use.
Description
Technical Field
The invention relates to a measuring system, in particular to a multi-method fused flowing fly ash carbon content on-line measuring system.
Background
Optimal control of boiler combustion efficiency has been a key concern in coal-fired power plants. The carbon content of fly ash is one of important parameters for representing the combustion efficiency of a boiler, and reflects the operation management level of a coal-fired power plant to a certain extent. The conventional method for detecting the carbon content of the fly ash has the defects of obvious time delay, easiness in interference of other elements, low accuracy and the like, and has a larger improvement space.
At present, the carbon content of fly ash is measured by various technical methods such as a microwave method, a burning weight loss method, a fluidized bed CO2 method, a laser induced breakdown spectroscopy technology, a radiation method and the like. The method of ignition weight loss is a common method in the current coal-fired power plant, and the traditional method of ignition weight loss is mainly based on off-line measurement. As the fly ash needs to be burned, cooled and weighed, the time delay is obvious, the analysis is delayed, and the measurement result is difficult to reflect the actual situation in the boiler. The microwave method with the highest commercial degree at present has low accuracy due to sensitivity to moisture and coal quality changes, and the built-in flue is influenced by fly ash concentration fluctuation. Radiation method, radiation high-risk and poor economy. The infrared reflection method cannot accurately measure the particle size, concentration, coal quality, humidity and other factors of the fly ash when the factors change. Patent CN201510642280 proposes an online measurement method and device for fly ash carbon content based on infrared reflection and optical pulsation methods, and because fly ash particle objects corresponding to infrared reflection and optical pulsation measurement values are not completely consistent, fly ash particle size and concentration information measured by an optical pulsation method corrects fly ash carbon content data measured by an infrared reflection method, which may have deviation.
For example, patent CN201610239213.9 calculates the carbon content of fly ash under the current operating condition by using the historical data sample set of the carbon content of fly ash and the auxiliary variable value of the current operating condition, and when the historical data has a deviation, a chain reaction is caused to the subsequent detection result, resulting in inaccurate data.
For example, patent CN201811110223.8 discloses that by uniformly dispersing a large amount of fly ash in each relatively independent space, the mass of fly ash to be burned in each independent space is relatively small and less dispersed, the design structure is complex, and the measurement process is prone to generate errors, thereby affecting the experimental results.
Under the bidding rule of the electric power spot market, the market competition is more intense, and the importance of improving the combustion efficiency of the boiler is self-evident. The fly ash carbon content measuring method generally adopted by the existing power plant has a plurality of defects, so that the fly ash carbon content monitoring instrument which is rapid in measurement, accurate in result, low in cost and convenient and fast to use is developed, and the fly ash carbon content monitoring instrument has important significance for improving the economic benefit of the coal-fired boiler.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a multi-method fused flowing fly ash carbon content online measurement system, which has the functions of quick measurement, accurate result, low cost and convenient use and has important significance for improving the economic benefit of a coal-fired boiler.
In order to achieve the purpose, the invention provides the following technical scheme: a multi-method-fused flowing fly ash carbon content online measurement system comprises a central control terminal, a shell, a laser detector, an infrared detector and a database, wherein the laser detector, the infrared detector and the database are arranged in the shell;
the central control terminal is respectively used for being in communication connection with the laser detector and the infrared detector, and is used for receiving laser data detected by the laser detector and light transmission data detected by the infrared detector;
the central control terminal is further provided with a holographic recording module and a holographic reconstruction module, the holographic recording module is used for recording interference and diffraction of laser rays and infrared rays to record interference images, and the holographic reconstruction module is used for reconstructing the interference images to obtain image information of original objects;
the database is in communication connection with the central control terminal, the database is used for storing calibration information, and the central control terminal is used for comparing the laser data, the light transmission data, the image information and the calibration information and calculating to obtain final carbon content data.
The invention is further configured to: the laser detector comprises a laser emitter, a beam expanding collimation assembly, a telecentric lens and a receiving camera, the laser emitter and the beam expanding collimation assembly are arranged on one side of the fly ash channel, the telecentric lens and the receiving camera are arranged on the other side of the fly ash channel, and laser rays emitted by the laser emitter irradiate carbon ash particles in the fly ash channel through the beam expanding collimation assembly and then receive laser signals through the telecentric lens and the receiving camera;
the receiving camera is in communication connection with the central control terminal and is used for feeding back laser signals to the central control terminal.
The invention is further configured to: the infrared detector comprises an infrared transmitter, an infrared receiver and a light intensity meter, the infrared transmitter is arranged on one side of the fly ash channel, the infrared receiver and the light intensity meter are arranged on the other side of the fly ash channel, infrared total light emitted by the infrared transmitter irradiates carbon ash particles in the fly ash channel and then is received by the infrared receiver, and the light intensity meter is used for measuring the light intensity of the infrared light received by the infrared receiver;
the light intensity meter is in communication connection with the central control terminal and used for feeding back the light intensity of the infrared light to the central control terminal.
The invention is further configured to: the infrared detector further comprises a reflecting mirror and a beam splitter, the infrared emitter is arranged on one side of the laser detector, and the reflecting mirror and the beam splitter are used for adjusting the light path direction of the total infrared light.
The invention is further configured to: an included angle exists between the light path direction of the total infrared light and the laser ray direction of the laser detector.
The invention is further configured to: the infrared receiver is arranged on one side of the laser detector, and an included angle of 120-150 degrees exists between the infrared receiver and the total infrared light.
The invention is further configured to: the holographic reconstruction module comprises a holographic reconstruction sub-module, a depth of field expansion sub-module, a particle identification sub-module and a particle positioning sub-module.
The invention is further configured to: the casing is including last shell and well shell and lower shell, well shell sets up with last shell and lower shell threaded connection respectively, all be provided with the holding tank on last shell and the lower shell, be provided with the shutoff piece that is used for the shutoff holding tank on the well shell, be provided with a plurality of light traps on the shutoff piece, the flying dust passageway sets up on well shell.
The invention is further configured to: the one end that well shell was kept away from to lower shell portion is provided with the connecting piece, the fly ash passageway is the square structure setting.
A multi-method fused flowing fly ash carbon content on-line measuring method,
s1: detecting an infrared light intensity signal after the carbon dust is attenuated due to reflection and scattering by an infrared detector;
s2: detecting a laser signal generated after scattering and diffraction of the carbon dust through a laser detector;
s3: recording an interference image of laser passing through carbon dust by a holographic recording module;
s4: analyzing the interference image through a holographic reconstruction module to obtain particle concentration and size information;
s5: and the central control terminal calculates the carbon content value according to the relational expression between the light intensity signal and the particle concentration, the particle size and the carbon content and calibration data in the database.
In conclusion, the invention has the following beneficial effects: the shell is arranged in a flue (generally, the position between an economizer and an air preheater) so that flue gas carrying carbon dust flows through the fly ash channel, the laser detector is started, laser rays emitted by the laser emitter irradiate carbon dust particles in the fly ash channel through the beam expanding and collimating component, then the laser signals are received by the receiving camera through the telecentric lens, and then the laser signals are transmitted to the central control terminal for digital processing and analysis to obtain particle size data.
The total infrared light that infrared transmitter sent shines behind the carbon dust granule in the fly ash passageway infrared light is received by infrared receiver, and the light intensity meter is used for measuring the light intensity size of being received infrared light by infrared receiver, transmits the light intensity signal back to well accuse terminal again.
And the central control terminal is used for calculating and analyzing, and the numerical value of the carbon content of the fly ash in the passing smoke is obtained according to the light intensity, the particle size and the particle concentration. In addition, the implementation of the holographic technology mainly comprises two steps of holographic recording and holographic reconstruction, interference images are recorded by utilizing interference and diffraction of light, image information of an original object is obtained by reconstructing the interference images, and the spatial position and the shape of the object are obtained by analyzing. In holography, the characteristics of interference fringes recorded on an imaging plane are related to the amplitude and phase of the scattered light it receives. When the laser irradiates objects with different shapes, the amplitude and the phase of the laser are changed, and the amplitude and the phase information of the scattered light correspond to the shape characteristics and the spatial position of the objects one to one. Therefore, the distribution of the interference fringes corresponds to the characteristics of the object one by one, so that the recording of the interference fringes records three-dimensional information of the object, namely, a holographic recording process. The holographic reconstruction process is to irradiate the hologram with coherent light and reproduce the object light information in the hologram by diffraction of the light without distortion.
In general, the product effectively improves the economic benefit of a power plant while saving energy and reducing consumption due to excellent measurement rapidity and accuracy. The product integrates optical technologies such as infrared reflection, holography, optical pulsation and the like, has quick response, breaks through the defect of off-line measurement, realizes on-line measurement of the carbon content of the fly ash, and reflects the change of the carbon content in real time. The fly ash carbon content can be measured by arranging the detection device at the corresponding position of the flue without sampling the fly ash in the operation process. The operation is more convenient, measures more intelligently, realizes that the detection analysis is automatic, can serve in "wisdom power plant" in the future.
Drawings
FIG. 1 is a schematic perspective view of an on-line carbon content monitoring device;
FIG. 2 is a schematic perspective view of the internal structure of the carbon content on-line monitoring device;
FIG. 3 is a schematic diagram of a carbon content on-line monitoring device;
FIG. 4 is a logic block diagram of a central control terminal;
FIG. 5 is a schematic diagram of a shielding gas circuit.
Reference numerals: 1. a central control terminal; 11. a holographic recording module; 12. a holographic reconstruction module; 121. a holographic reconstruction submodule; 122. a depth of field expansion submodule; 123. a particle identification sub-module; 124. a particle positioning sub-module; 2. a housing; 21. a fly ash channel; 22. an upper housing portion; 23. a middle shell part; 24. a lower housing portion; 25. a connecting member; 3. a laser detector; 31. a laser transmitter; 32. a beam expanding and collimating assembly; 33. a telecentric lens; 34. receiving a camera; 4. an infrared detector; 41. an infrared emitter; 42. an infrared receiver; 43. a light intensity meter; 44. a mirror; 45. a beam splitter; 5. a database.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. In which like parts are designated by like reference numerals. It should be noted that the terms "front," "back," "left," "right," "upper" and "lower" used in the following description refer to directions in the drawings, and the terms "bottom" and "top," "inner" and "outer" refer to directions toward and away from, respectively, the geometric center of a particular component.
Referring to fig. 1 to 5, in order to achieve the above object, the present invention provides the following technical solutions: a multi-method-fused flowing fly ash carbon content online measurement system comprises a central control terminal 1, a shell 2, a laser detector 3 and an infrared detector 4, wherein the laser detector 3 and the infrared detector 4 are arranged in the shell 2;
the central control terminal 1 is respectively used for being in communication connection with the laser detector 3 and the infrared detector 4, and the central control terminal 1 is used for receiving laser data detected by the laser detector 3 and light transmission data detected by the infrared detector 4 and calculating a carbon content value;
the central control terminal 1 further comprises a holographic recording module 11 and a holographic reconstruction module 12, wherein the holographic recording module 11 is used for recording interference and diffraction of laser rays and infrared rays to record interference images, and the holographic reconstruction module 12 is used for reconstructing the interference images to obtain image information of original objects.
The database 5 is in communication connection with the central control terminal 1, the database 5 is used for storing calibration information, and the central control terminal 1 is used for comparing the laser data, the light transmission data, the image information and the calibration information and calculating to obtain final carbon content data.
The central control terminal 1 is a computer host.
According to the design of the invention, the shell 2 is arranged in a flue (generally, the position between an economizer and an air preheater) so that flue gas carrying carbon dust flows through the fly ash channel 21, the laser detector 3 is started, laser rays emitted by the laser emitter 31 irradiate carbon dust particles in the fly ash channel 21 through the beam expanding and collimating assembly 32, then the laser signals are received by the receiving camera 34 through the telecentric lens 33, and then the laser signals are transmitted to the central control terminal 1 for digital processing and analysis to obtain particle size data.
The total infrared light emitted by the infrared emitter 41 irradiates carbon soot particles in the fly ash channel 21 and then is received by the infrared receiver 42, and the light intensity meter 43 is used for measuring the intensity of the infrared light received by the infrared receiver 42 and then transmits a light intensity signal to the central control terminal 1.
The central control terminal 1 is used for calculation and analysis, and the numerical value of the carbon content of the fly ash in the passing smoke is obtained according to the light intensity, the particle size and the particle concentration. In addition, the implementation of the holographic technology mainly comprises two steps of holographic recording and holographic reconstruction, interference images are recorded by utilizing interference and diffraction of light, image information of an original object is obtained by reconstructing the interference images, and the spatial position and the shape of the object are obtained by analyzing. In holography, the characteristics of interference fringes recorded on an imaging plane are related to the amplitude and phase of the scattered light it receives. When the laser irradiates objects with different shapes, the amplitude and the phase of the laser are changed, and the amplitude and the phase information of the scattered light correspond to the shape characteristics and the spatial position of the objects one to one. Therefore, the distribution of the interference fringes corresponds to the characteristics of the object one by one, so that the recording of the interference fringes records three-dimensional information of the object, namely, a holographic recording process. The holographic reconstruction process is to irradiate the hologram with coherent light and reproduce the object light information in the hologram by diffraction of the light without distortion.
In general, the product effectively improves the economic benefit of a power plant while saving energy and reducing consumption due to excellent measurement rapidity and accuracy. The product integrates optical technologies such as infrared reflection, holography, optical pulsation and the like, has quick response, breaks through the defect of off-line measurement, realizes on-line measurement of the carbon content of the fly ash, and reflects the change of the carbon content in real time. The fly ash carbon content can be measured by arranging the detection device at the corresponding position of the flue without sampling the fly ash in the operation process. The operation is more convenient, measures more intelligently, realizes that the detection analysis is automatic, can serve in "wisdom power plant" in the future.
The laser detector 3 comprises a laser emitter 31, an expanded beam collimation assembly 32, a telecentric lens 33 and a receiving camera 34, wherein the laser emitter 31 and the expanded beam collimation assembly 32 are arranged on one side of the fly ash channel 21, the telecentric lens 33 and the receiving camera 34 are arranged on the other side of the fly ash channel 21, and laser rays emitted by the laser emitter 31 irradiate carbon ash particles in the fly ash channel 21 through the expanded beam collimation assembly 32 and then receive laser signals through the telecentric lens 33 and the receiving camera 34;
the receiving camera 34 is in communication connection with the central control terminal 1 and is used for feeding back a laser signal to the central control terminal 1.
The infrared detector 4 comprises an infrared emitter 41, an infrared receiver 42 and a light intensity meter 43, the infrared emitter 41 is arranged on one side of the fly ash channel 21, the infrared receiver 42 and the light intensity meter 43 are arranged on the other side of the fly ash channel 21, the infrared receiver 42 receives infrared light after total infrared light emitted by the infrared emitter 41 irradiates carbon ash particles in the fly ash channel 21, and the light intensity meter 43 is used for measuring the light intensity of the infrared light received by the infrared receiver 42;
the light intensity meter 43 is in communication connection with the central control terminal 1 and is used for feeding back the light intensity of the infrared light to the central control terminal 1.
The infrared detector 4 further includes a reflecting mirror 44 and a beam splitter 45, the infrared emitter 41 is disposed on one side of the laser detector 3, and the reflecting mirror 44 and the beam splitter 45 are used for adjusting the optical path direction of the total infrared light. The reflecting mirror 44 and the beam splitter 45 are designed to be able to dispose the infrared detector 4 and the laser detector 3 on different planes, and the reflecting mirror 44 and the beam splitter 45 adjust the optical path direction of the infrared emitter 41, so that the infrared emitter has adjustability.
An included angle exists between the light path direction of the total infrared light and the laser ray direction of the laser detector 3. In order to prevent the infrared ray of the infrared emitter 41 from damaging the receiving camera 34, the infrared laser beam can be slightly inclined to the horizontal direction by fine-tuning the direction of the reflector 44, thereby protecting the receiving camera 34.
The infrared receiver 42 is disposed at one side of the laser detector 3, and an included angle of 120 ° to 150 ° exists between the infrared receiver 42 and the total infrared light. Experiments show that for the measurement of the carbon content of the flowing type fly ash, the infrared reflection light intensity measured when the detector and the infrared light source emit light at an angle of about 120-150 degrees is larger.
The holographic reconstruction module 12 includes a holographic reconstruction sub-module 121, a depth-of-field expansion sub-module 122, a particle identification sub-module 123, and a particle location sub-module 124. Because the fly ash particle concentration and size can generate large interference to the detection of carbon content, which can greatly reduce the accuracy of the carbon content detection, it is particularly critical to solve the problem of the interference of the particle concentration and size. And adding an image acquisition module, and correcting a relational expression of the carbon content of the fly ash and the light intensity signal according to the particle concentration and size obtained by the module through holographic analysis so as to obtain the carbon content data of the fly ash with improved precision.
The probe refers to the housing plus the laser detector and infrared detector collectively. The harsh working environment in the flue brings great difficulty to the detection of the carbon content in the fly ash. The probe is mounted in the flue, typically at a location between the economizer and the air preheater. The flue gas in the detection area has a lower temperature than the flue gas at other locations in the flue (which is still higher for room temperature), and the high-speed ash particles in the flue gas tend to cause metal wear. Meanwhile, when the metal is contacted with the flue gas, sulfuric acid vapor in the flue gas can be condensed on the surface of the metal, so that the metal is seriously corroded. Therefore, the material selected for the structure of the shell 2 is a corrosion-resistant and high-temperature-resistant ceramic material, and can meet the severe environment in the flue.
Casing 2 is including last shell 22 and well shell 23 and lower shell 24, well shell 23 respectively with last shell 22 and 24 threaded connection settings of lower shell, all be provided with the holding tank on last shell 22 and the lower shell 24, be provided with the shutoff piece that is used for the shutoff holding tank on the well shell 23, be provided with a plurality of light traps on the shutoff piece, flying dust passageway 21 sets up on well shell 23.
The end of the lower shell part 24 remote from the middle shell part 23 is provided with a connection 25. The design of the structure of the shell 2 plays a role of convenient installation, and the inside of the structure of the whole shell 2 is provided with a fixed structure according to the specific size of the selected accessory.
The fly ash channel 21 is arranged in a square structure.
As shown in fig. 5, the lower housing part 24 and the upper housing part 22 are both provided with air inlets for conveying shielding gas, the black bold line indicates a light path, the dotted line indicates shielding gas, the flowing direction of the fly ash channel is perpendicular to the light path, narrow air exhaust channels are arranged at two sides of the fly ash channel perpendicular to the light path, so that the shielding gas flows out along the fly ash channel, fly ash is controlled by air flow to be not dispersed, and the fly ash flows out along the fly ash channel, thereby ensuring the accuracy of the experiment.
The relationship between the light intensity signal I received by the infrared detector and each parameter is shown as the following formula:
I＝h(θ,l)f(x)g(d)k(c)o(η)+δ
i is related to parameters such as theta, l, delta, x, d, c, eta and the like. Wherein l is various size parameters (such as the distance between the infrared detector and the center of the fly ash channel) determined by the probe structure, theta is an included angle between the infrared receiver 42 and the total infrared light, and 135 degrees is selected as a proper included angle theta after experiments, namely, the function value h (theta, l) is determined after the probe structure is manufactured. Delta is a light intensity signal detected by the light intensity when no fly ash passes through, is a fixed interference item and is easily measured by experiments. x is average carbon content, d is average particle size, c is fly ash particle concentration in a measurement region, eta is measurement region humidity and can be measured by a humidity sensor, d and c can be measured by a holographic reconstruction module, and x is unknown quantity. According to the formula, all the parameters except the average carbon content x are measurable known quantities, and after all the function expressions are determined, the carbon content x can be reversely deduced according to the measured quantities d, c, eta and I.
Drawing up an experimental idea of the relation between the scattering light intensity I and the average carbon content x, the size d, the concentration c and the humidity eta of the particles:
the relations between the received infrared light intensity I and x, d, c, eta are determined by the experimental method of the control variable, namely the functional relations f (x), g (d), k (c) and o (eta) are determined.
1. Determining the functional relation g (d)
In practical experiments, the carbon content x of the fly ash is fixed to fix f (x), the concentration c of the fly ash particles is fixed to fix k (c), the humidity eta of the fly ash particles is fixed to fix o (eta) (the humidity of the fly ash particles can be artificially controlled by controlling the drying time of a sample), the scattering light intensity I under different particle size conditions is measured, a relational graph of the emission light intensity I and the particle size d is drawn to carry out data fitting, and the expression of the function g (d) is obtained (because functions f (x), k (c) and o (eta) need to be drawn later, and the proportionality coefficient of the function g (d) can be optionally obtained). The relation g (d) of the scattering light intensity and the average particle size obtained by fitting can be verified by a theoretical meter scattering model.
2. Determining a functional relation k (c)
Similarly, a function relation k (c) is determined by a variable control method, namely the carbon content x of the fixed fly ash is fixed so as to fix f (x), the average particle size d of the fixed fly ash particles is fixed so as to fix g (d), the humidity eta of the fixed fly ash particles is fixed so as to fix o (eta), the scattering light intensity I under different fly ash particle concentration conditions is measured, a relation graph of the emission light intensity I and the particle concentration c is drawn, and data fitting is carried out, so that the expression of the function k (c) is obtained.
3. Determining the functional relation f (x)
Similarly, a function relation f (x) is determined by a variable control method, namely the concentration c of the fixed fly ash particles is fixed so as to fix k (c), the average particle size d of the fixed fly ash particles is fixed so as to fix g (d), the humidity eta of the fixed fly ash particles is fixed so as to fix o (eta), the scattering light intensity I under different carbon content conditions is measured, a relation graph of the emission light intensity I and the carbon content x of the particles is drawn, and data fitting is carried out, so that the expression of the function f (x) is obtained.
4. Determining a functional relation o (eta)
Since the fly ash particle concentration c, the average particle diameter d and the carbon content x are difficult to be fixed at the same time, under the condition of the known functional expressions g (d), k (c), f (x), the expression o (eta), namely the expression o (eta), can be reversely deduced by the original functional relational expression I ═ h (theta, l) f (x) g (d), k (c) o (eta) + delta
The light intensity I under different parameter conditions is measured, and other parameters (such as g (d), k (c) and f (x)) can be measured and calculated by the previous method, and an eta-o (eta) relational graph can be obtained according to the formula. And fitting the data to obtain an expression of o (eta). At this time, the relation between the infrared light intensity I and parameters such as theta, l, delta, x, d, c, eta and the like is determined.
A multi-method fused flowing fly ash carbon content on-line measuring method,
s1: detecting an infrared light intensity signal after the carbon dust is attenuated due to reflection and scattering by an infrared detector;
s2: detecting a laser signal generated after scattering and diffraction of the carbon dust through a laser detector;
s3: recording an interference image of laser passing through carbon dust by a holographic recording module;
s4: analyzing the interference image through a holographic reconstruction module to obtain particle concentration and size information;
s5: and the central control terminal calculates the carbon content value according to the relational expression between the light intensity signal and the particle concentration, the particle size and the carbon content and calibration data in the database.
The above is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above-mentioned embodiments, and all technical solutions belonging to the idea of the present invention belong to the protection scope of the present invention. It should be noted that modifications and embellishments within the scope of the invention may occur to those skilled in the art without departing from the principle of the invention, and are considered to be within the scope of the invention.
Claims (10)
1. A multi-method fused flowing fly ash carbon content on-line measuring system is characterized in that: the device comprises a central control terminal (1), a shell (2), a laser detector (3), an infrared detector (4) and a database (5), wherein the laser detector (3), the infrared detector (4) and the database (5) are arranged in the shell (2), a fly ash channel (21) for carbon ash to pass through is formed in the middle of the shell (2), the laser detector (3) is used for detecting laser data of the carbon ash in the fly ash channel (21), and the infrared detector (4) is used for detecting light transmission data of the carbon ash in the fly ash channel (21);
the central control terminal (1) is respectively used for being in communication connection with the laser detector (3) and the infrared detector (4), and the central control terminal (1) is used for receiving laser data detected by the laser detector (3) and light transmission data detected by the infrared detector (4);
the central control terminal (1) is further provided with a holographic recording module (11) and a holographic reconstruction module (12), the holographic recording module (11) is used for recording interference images through recording interference and diffraction of laser rays and infrared rays, and the holographic reconstruction module (12) is used for reconstructing the interference images to obtain image information of an original object;
the database (5) is in communication connection with the central control terminal (1), the database (5) is used for storing calibration information, and the central control terminal (1) is used for comparing the laser data, the light transmission data, the image information and the calibration information to calculate to obtain final carbon content data.
2. The system of claim 1, wherein the system comprises: the laser detector (3) comprises a laser emitter (31), an expanded beam collimation assembly (32), a telecentric lens (33) and a receiving camera (34), the laser emitter (31) and the expanded beam collimation assembly (32) are arranged on one side of the fly ash channel (21), the telecentric lens (33) and the receiving camera (34) are arranged on the other side of the fly ash channel (21), and laser rays emitted by the laser emitter (31) irradiate carbon ash particles in the fly ash channel (21) through the expanded beam collimation assembly (32) and then pass through the telecentric lens (33) to be received by the receiving camera (34) to obtain laser signals;
the receiving camera (34) is in communication connection with the central control terminal (1) and is used for feeding back laser signals to the central control terminal (1).
3. The system of claim 1, wherein the system comprises: the infrared detector (4) comprises an infrared emitter (41), an infrared receiver (42) and a light intensity meter (43), the infrared emitter (41) is arranged on one side of the fly ash channel (21), the infrared receiver (42) and the light intensity meter (43) are arranged on the other side of the fly ash channel (21), infrared total light emitted by the infrared emitter (41) irradiates carbon ash particles in the fly ash channel (21) and then is received by the infrared receiver (42), and the light intensity meter (43) is used for measuring the light intensity of the infrared light received by the infrared receiver (42);
the light intensity meter (43) is in communication connection with the central control terminal (1) and is used for feeding back the light intensity of the infrared light to the central control terminal (1).
4. The system of claim 3, wherein the system comprises: the infrared detector (4) further comprises a reflecting mirror (44) and a beam splitter (45), the infrared emitter (41) is arranged on one side of the laser detector (3), and the reflecting mirror (44) and the beam splitter (45) are used for adjusting the light path direction of the total infrared light.
5. The system of claim 4, wherein the system comprises: an included angle exists between the light path direction of the total infrared light and the laser ray direction of the laser detector (3).
6. The system of claim 4, wherein the system comprises: the infrared receiver (42) is arranged on one side of the laser detector (3), and an included angle of 120-150 degrees exists between the infrared receiver (42) and the total infrared light.
7. The system according to any one of claims 1 to 6, wherein the system comprises: the holographic reconstruction module (12) comprises a holographic reconstruction sub-module (121), a depth of field expansion sub-module (122), a particle identification sub-module (123) and a particle positioning sub-module (124).
8. The system according to any one of claims 1 to 6, wherein the system comprises: casing (2) including last shell (22) and well shell (23) and lower shell (24), well shell (23) set up with last shell (22) and lower shell (24) threaded connection respectively, all be provided with the holding tank on last shell (22) and lower shell (24), be provided with the shutoff piece that is used for the shutoff holding tank on well shell (23), be provided with a plurality of light traps on the shutoff piece, flying dust passageway (21) sets up on well shell (23).
9. The system according to claim 8, wherein the system comprises: one end of the lower shell part (24) far away from the middle shell part (23) is provided with a connecting piece (25), and the fly ash channel (21) is arranged in a square structure.
10. A multi-method fused flowing fly ash carbon content on-line measuring method is characterized in that:
s1: detecting an infrared light intensity signal of the carbon dust attenuated due to reflection and scattering by an infrared detector (4);
s2: detecting a laser signal of the carbon dust after scattering and diffraction by a laser detector (3);
s3: recording an interference image of the laser when passing through the carbon dust by a holographic recording module (11);
s4: analyzing the interference image through a holographic reconstruction module (12) to obtain particle concentration and size information;
s5: the central control terminal (1) calculates the carbon content value according to the relational expression between the light intensity signal and the particle concentration, the particle size and the carbon content and the calibration data in the database (5).
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114199809A (en) * | 2021-11-23 | 2022-03-18 | 南京大学 | Monolithic integrated infrared laser gas detection device |
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| CN109297874A (en) * | 2018-11-30 | 2019-02-01 | 浙江大学 | It is a kind of for measuring the holographic method for real-time measurement and device of moving particle partial size |
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| CN101949835A (en) * | 2010-08-06 | 2011-01-19 | 北京大学 | On-line aerosol carbon component collecting analyser |
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