CN1243233C - Analyser for spark through spectrum medium by laser induced - Google Patents
Analyser for spark through spectrum medium by laser induced Download PDFInfo
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- CN1243233C CN1243233C CN 03128349 CN03128349A CN1243233C CN 1243233 C CN1243233 C CN 1243233C CN 03128349 CN03128349 CN 03128349 CN 03128349 A CN03128349 A CN 03128349A CN 1243233 C CN1243233 C CN 1243233C
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Abstract
The present invention relates to a laser-induced breakdown spectrum coal analyzer, which belongs to the technical fields of laser diagnosis and measurement and is used for solving the problem of quick analysis of coal samples. The present invention comprises a sampling part and an analysis part, wherein the analysis part comprises an optical source system, an optical splitting system, a sequence control system and a collecting analysis system, and the sampling part is composed of a cyclone separator and a quartz analysis pool arranged below the cyclone separator. In use, the quartz analysis pool is fixed on a fixed table of the quartz analysis pool driven by a motor after the quartz analysis pool is taken off from the cyclone separator, a filter is arranged on an emergent light opening of a laser of the optical source system, a flat mirror is arranged on an emergent light path at an angle of 45 DGE with the emergent light path, a convex lens is arranged vertical to the emergent light path corresponding to the flat mirror, and the quartz analysis pool is arranged at the focus of the convex lens. The device can simultaneously measure main elements, most secondary elements and few trace elements in coal at one time in an on-line mode, and the time for sampling and measuring is smaller than five minutes. The device has the advantages of compact structure, convenient industrial instillation and small size. The problem that coal-fired power plants carry out on-line quick analysis to coal samples presently is solved, and the problems of high cost and huge volume of imported coal quality on-line measuring instruments are overcome.
Description
Technical field
The invention belongs to laser diagnostics and field of measuring technique, be specifically related to a kind of going into the device that the stove coal carries out online express-analysis.
Background technology
The capital expenditure of coal-burning power plant, economical operation and to environmental impact etc., relevant with ature of coal to a great extent.In the thermal power generation cost, the coal expense accounts for 80%.Therefore, understanding and research ature of coal factors are vital to the influence of coal-burning power plant.The coal analysis method of off-line has some spectrochemical analysis means such as vapor-phase chromatography, liquid phase chromatography, mass spectroscopy, flame photometric analysis method and ICP-AES.The ature of coal measuring method of these off-lines generally needs several hrs from sampling, sample preparation to quoting of assay.Testing result seriously lags behind boiler combustion, and this has not only caused the waste of the energy to a certain extent, and can't online in real time instruct boiler operatiopn.The coal analysis method of off-line has been difficult to satisfy the requirement of thermal power plant's coal detection technique development, employing is advanced, analysis means has become the task of top priority fast, particularly develop effective ature of coal real-time monitoring system, make testing result directly feed back to the operation control center of boiler combustion, instruct the boiler combustion optimization operation, change, in time adjust boiler combustion process according to ature of coal, realize the high-efficiency low-pollution operation of coal-burning boiler, become the direction of thermal power plant's coal detection technique development.At present, online ature of coal measuring method has: X-ray fluorescence spectra, dual energy gamma-rays transmission beam method, fast neutron and gamma-rays absorption process etc.But it is that 13 aluminium and atomic weight are the element between 92 the uranium that X-ray fluorescence spectra only be fit to be analyzed atomic weight.The shortcoming of dual energy gamma ray transmission beam method maximum be cost an arm and a leg, potential safety hazard is big.At present, about about 4,000,000 Renminbi of the price of the online coal analysis instrument of a Gamma-Metrics company; And gamma-ray harm to human body is very big.In addition, the gamma ray projector of gamma-rays coal analysis instrument and gamma-rays receiver are two independent parts separately, install to industry difficulty also is provided.
The laser-induced breakdown spectroscopy technology has high detection sensitivity, can be implemented in line and measures, and one time spectrum can be measured various ingredients, does not disturb measurand, and measuring object can be gas, liquid, also can be solid.With above-mentioned ature of coal on-line analysis method, it can reduce equipment cost significantly relatively, compact conformation, and emissive source does not separate with reception, test section, is beneficial to industry and installs, and can make portable.Safe in utilization, simple, there is not the potential safety hazard of bringing as gamma-rays etc.Researcher with artificial representatives such as J.P.Singh has carried out deep experimental study to laser-induced breakdown spectroscopy, and the experiment block scheme is seen Fig. 1.
Among Fig. 1, the solid line of band arrow is a source emissioning light, and the dotted line of band arrow is a plasma emissioning light.Behind monochromator splitting, handle light signal by data acquisition and analytic system through Optical Fiber Transmission for the emission light of plasma.It is to be absorbed by light barrier after the transmittance of 1064nm that spectroscope makes wavelength be that the light of 532nm reflexes to reflective mirror, makes wavelength.More than in the experiment for solid sample, need before experiment, carry out molten sample and handle, be the top that the molten sample 100 μ l of 1000 μ g/ml drip to carbon rod with dropper with concentration then, molten sample produces plasma with laser action after the surface evaporation of carbon rod becomes gaseous state.The rotation of sample cell is artificially controlled with an external nylon screw.This experimental technique mainly is to be used for laboratory scale experimental study, is not suitable for the requirement of industrial online application.
Summary of the invention
The present invention proposes a kind of laser-induced breakdown spectroscopy coal analysis instrument, solves the problem of present coal-burning power plant to the online express-analysis of coal sample; The online coal analysis instrument of the ature of coal on-line measurement instrument at the import of minority coal-burning power plant---Gamma-Metrics company costs an arm and a leg, the problem of bulky, designs and produce the online quick analytic instrument of Eco-power ature of coal.
A kind of laser-induced breakdown spectroscopy coal analysis instrument of the present invention, comprise sampling part and analysis part, the beam splitting system that analysis part comprises light-source system, be made of monochromator or polychromator, the sequential control system of forming by pulse producer and time delays device and by detecting device with analyze the acquisition analysis system that capture card is formed; Light-source system comprises laser instrument and frequency multiplier, on the plasma emissioning light road that sampling part produces convergent lens is housed, luminescence of plasma is accumulated in beam splitting system, beam splitting system light-emitting window installation and measuring device, the latter is connected with analysis capture card electric signal, the pulse producer output signal is respectively as the input signal of laser instrument and time delay device, time delay device inhibit signal output control detection device, it is characterized in that: (1) described sampling part is made up of cyclone separator and installing quartzy analysis cell thereunder, in use, quartzy analysis cell is from being fixed in after cyclone separator takes off on the analysis cell fixed station by motor driven; (2) described light-source system laser emitting light mouth is mounted with filter plate, and level crossing is equipped with at angle at 45 with it on the emitting light path, does not have convex lens to should level crossing vertical with emitting light path, and the concave lens focus place is described quartzy analysis cell;
Described laser-induced breakdown spectroscopy coal analysis instrument, described analysis capture card can be installed in single-chip microcomputer or the embedded computer and with display and link to each other.
The invention has the beneficial effects as follows: utilize cyclone separator directly to get coal sample, do not need that coal sample is carried out fragmentation, abrasive dust, dissolving etc. and handle again from the coal pulverizer outlet; Sample directly falls into analysis cell; The analysis cell that sample is housed is fixed on and carries out express-analysis in the laser-induced breakdown spectroscopy analyser; Directly analyze the element kind and the concentration value thereof of the stove coal of coming in and going out.The present invention is equipped with a filter plate at the emergent light mouth of laser instrument, filters the primary light that wavelength is 1064nm, the laser of the 532nm of outgoing directly through mirror reflects to condenser lens; The Laser emission direction of light is vertical with the direction that receives plasma emissioning light among the present invention, the influence that can remove LASER Light Source so most effectively, and the direction of the two is a level in the block scheme shown in Figure 1; In order to make the instrument compactness, be directly incident on the entrance slit of monochromator after the emission light line focus of ionic medium body of the present invention, do not need by Optical Fiber Transmission, reduce optical loss; Simultaneously analysis cell platform of the present invention is by motor driven, and the homogeneity with the illuminated laser spot that guarantees measuring object has improved the accuracy of measuring.
This device can once be measured the main secondary element in the coal, most of minor element and minority trace element simultaneously; Sampling and Measuring Time were less than 5 minutes; Apparatus structure compactness, volume be little, be convenient to industry installs.This device is applicable to that the stove coal of going into to the fuel-burning power plant coal-burning boiler carries out online express-analysis.
Description of drawings
Fig. 1: the prior art block scheme,
Fig. 2: installation site figure of the present invention,
Fig. 3: sampling part synoptic diagram of the present invention,
Fig. 4: structural representation of the present invention,
Fig. 5: each ingredient block scheme of the present invention.
Embodiment
As shown in Figure 2, the sampling part of the present invention coal dust that is installed in the coal-burning power plant enters stain 1 indication of seeing before the burner among Fig. 2 place by machine supplying powder; Sampling part of the present invention shown in Figure 3 comprises two parts: small-sized cyclone separator 2 and quartzy analysis cell 3.Utilize a small-sized cyclone separator 2 to take out the fine coal of 5-10 gram, the fine coal that falls into quartzy analysis cell 3 is as analytic target.
As shown in Figure 4 and Figure 5, whole device is divided into two-layer: the ground floor and the second layer.Before the detailed process of explanation analysis to measure, introduce a mechanical control section in this device earlier: quartzy analysis cell 2 is fixed on the analysis cell fixed station 11 of analysis part of this device, analysis cell stationary platform 11 is by motor 13 driven in rotation, the gyro frequency of motor 13 is 1-5 rev/min, to guarantee the some difference of each laser pulses irradiate to coal sample.In addition, motor 13 is positioned at the ground floor of device, drives analysis cell fixed station 11 rotations of being fixed on the second layer platform; Other device in the device is fixed in the second layer or device wall.
Main part---the analysis part of laser-induced breakdown spectroscopy ature of coal in-line analyzer mainly comprises sequential control system that the light-source system be made up of laser instrument 5 and frequency multiplier 6, beam splitting system, pulse producer 15 and time delay device 16 that polychromator 10 is formed form, by detecting device (ICCD) 12 with analyze capture card 14 and form four parts of acquisition analysis system and form.
The laser instrument 5 of high power pulse is as light source, and laser instrument also can be excimer laser, ruby laser etc. based on the Nd:YAG laser instrument.Is the concrete embodiment of example explanation at this with the Nd:YAG laser instrument.The pulsed frequency of laser instrument 5 is that 5～20Hz, pulse width are that 5～10ns, peak value of pulse energy are that 100～300mJ, optical maser wavelength are 1064nm.It is 532nm that the frequency multiplier 6 that adds a KDP type before laser instrument 5 bright dippings makes outgoing optical maser wavelength.Light-emitting window at laser instrument loads a filter plate, remove the light that wavelength is 1064nm, the wavelength of outgoing is to shine on the convex lens 8 after the laser of 532nm reflects through level crossing 7, level crossing 7 becomes 45o to place with incident light, laser light reflected is after the convex lens 8 of 5cm focus on the coal sample of laser focusing in the analysis cell through focal length, the inside surface of analysis cell is the focus place of convex lens 8, and the rapid ionization of the coal sample of focus point produces high temperature, highdensity plasma.The axis normal of the axis of convex lens 8 and condenser lens 9, condenser lens 9 is 5cm with the inside surface distance of analysis cell.The light focal length that plasma sends is that the condenser lens 9 of 5cm focuses on beam splitting system---the inlet of polychromator 10, polychromator adopts the polychromator of models such as SpectraPro 300i or 500i, select the grating of 1200～2400g/mm for use, resolution is 0.05～0.1nm.Make mixed light become a series of monochromatic light of arranging by wavelength after the polychromator beam split.At the light-emitting window of polychromator multichannel detecting device (ICCD) 12 is installed and is detected, ICCD selects the PIMAX:1024RB type for use.Utilize single-chip microcomputer (or embedded computer) 14 to analyze the digital signal of ICCD output then, obtain spectral information at last.
In addition,, can fall into oblivion the validity feature spectral line of spectrum, catch effective spectral signal, a sequential control system must be arranged because the background continuous radiation of plasma is very strong.This control system is made of a pulse producer 15 and DG535 type time delay generator 16.Single-chip microcomputer (or embedded computer) 14 sends a signal and makes pulse producer 15 actions as the input signal of pulse producer 15, two output signals of pulse producer 15 are respectively as the input signal of laser instrument 5 and time delay generator 16, and laser instrument 5 is received and sent laser radiation behind the pulse signal and make sample ionization luminous to sample; After time delay generator 16 was received pulse signal, according to obtaining inhibit signal output the time delay of setting (being generally 5～20 μ s), the inhibit signal control detection device 12 of output began to detect, and masks the background radiation of plasma effectively.The detection signal of detecting device 12 obtains effective spectrogram by single-chip microcomputer (or embedded computer) 14.Draw the element kind of being analyzed according to the spectrogram characteristic spectral line wavelength that obtains; Then, by calibration curve, the intensity of corresponding spectral line is just represented the concentration of analytical element, thereby reaches the purpose of ultimate analysis.In addition, single-chip microcomputer 14 (or embedded computer) can directly link to each other with display 4, and display 4 is operating personnel's the control interface and the display interface of analysis result; Power module 17 provides instrument power source, links to each other with external power supply.
Claims (2)
1. laser-induced breakdown spectroscopy coal analysis instrument, comprise sampling part and analysis part, the beam splitting system that analysis part comprises light-source system, be made of monochromator or polychromator, the sequential control system of forming by pulse producer and time delays device and by detecting device with analyze the acquisition analysis system that capture card is formed; Light-source system comprises laser instrument and frequency multiplier, on the plasma emissioning light road that sampling part produces convergent lens is housed, luminescence of plasma is accumulated in beam splitting system, beam splitting system light-emitting window installation and measuring device, detecting device is connected with analysis capture card electric signal, as the input signal of laser instrument and time delay device, time delay device inhibit signal output control detection device is characterized in that the pulse producer output signal respectively:
(1) described sampling part is made up of cyclone separator and thereunder quartzy analysis cell of installing, and in use, quartzy analysis cell is from being fixed in after cyclone separator takes off on the analysis cell fixed station by motor driven;
(2) described light-source system laser emitting light mouth is mounted with filter plate, and level crossing is equipped with at angle at 45 with it on the emitting light path, and to should the vertical convex lens that are provided with emitting light path of level crossing, the concave lens focus place be described quartzy analysis cell;
(3) after the light line focus mirror that takes place of plasma focuses on, with the direction focusing vertical with the light path of incident light irradiation sample in polychromator.
2. laser-induced breakdown spectroscopy coal analysis instrument as claimed in claim 1 is characterized in that described analysis capture card is installed in single-chip microcomputer or the embedded computer and with display to link to each other.
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| CN 03128349 CN1243233C (en) | 2003-07-18 | 2003-07-18 | Analyser for spark through spectrum medium by laser induced |
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| CN 03128349 CN1243233C (en) | 2003-07-18 | 2003-07-18 | Analyser for spark through spectrum medium by laser induced |
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| CN1243233C true CN1243233C (en) | 2006-02-22 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1908626B (en) * | 2006-08-17 | 2010-05-12 | 中国科学院上海技术物理研究所 | Laser inductive dissociation spectrum detection system for space environment simulation and detection method thereof |
| CN102590157A (en) * | 2012-02-20 | 2012-07-18 | 山西大学 | Element spectrum analysis method and laser element exploration equipment adopting same |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100526859C (en) * | 2006-08-23 | 2009-08-12 | 太原市海通自动化技术有限公司 | Coal on-line analyse equipment based on laser induced spectral and nerve network technology |
| CN100593712C (en) * | 2007-07-06 | 2010-03-10 | 中国科学院上海技术物理研究所 | Laser induction atomic emission spectrum investigating system and method of time resolution |
| CN206074453U (en) * | 2015-07-20 | 2017-04-05 | 赛默科技便携式分析仪器有限公司 | Laser-induced breakdown system |
| CN105181675A (en) * | 2015-09-24 | 2015-12-23 | 华南理工大学 | Fly ash carbon content detecting device and method based on pulse discharge plasma spectrum |
| CN105319200B (en) * | 2015-11-06 | 2018-01-16 | 华南理工大学 | Pulsed discharge plasma excites the solid constituent measurement apparatus and method of particle stream |
| CN113433114B (en) * | 2021-06-07 | 2024-06-04 | 安徽华电六安电厂有限公司 | Laser detection visualization device for coal quality of coal entering furnace |
-
2003
- 2003-07-18 CN CN 03128349 patent/CN1243233C/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1908626B (en) * | 2006-08-17 | 2010-05-12 | 中国科学院上海技术物理研究所 | Laser inductive dissociation spectrum detection system for space environment simulation and detection method thereof |
| CN102590157A (en) * | 2012-02-20 | 2012-07-18 | 山西大学 | Element spectrum analysis method and laser element exploration equipment adopting same |
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| CN1480722A (en) | 2004-03-10 |
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