CN101603929B - Device for detecting compositions of coal on conveying belt in real time - Google Patents

Device for detecting compositions of coal on conveying belt in real time Download PDF

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Publication number
CN101603929B
CN101603929B CN200910181428XA CN200910181428A CN101603929B CN 101603929 B CN101603929 B CN 101603929B CN 200910181428X A CN200910181428X A CN 200910181428XA CN 200910181428 A CN200910181428 A CN 200910181428A CN 101603929 B CN101603929 B CN 101603929B
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coal
gamma ray
neutron source
conveying belt
ray detectors
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CN101603929A (en
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张德琳
宋兆龙
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Jiangsu Guangzhao Technology Co., Ltd.
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Jiangsu Guangzhao Technology Co Ltd
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Abstract

The invention discloses a device for detecting compositions of coal on a conveying belt in real time, which comprises an upper neutron source and an upper gamma ray detector which are arranged above the conveying belt and a lower neutron source and a lower gamma ray detector which are arranged below the conveying belt, wherein the upper neutron source and the upper gamma ray detector are fixed on an upper lead block seat; the lower neutron source and the lower gamma ray detector are fixed on a lower lead block seat; the outside of the upper lead block seat and the lower lead block seat is provided with a shielding layer; the upper neutron source faces the lower gamma ray detector, and the lower neutron source faces the upper gamma ray detector; and the upper gamma ray detector and the lower gamma ray detector are sequentially connected with a gamma spectrum analyzer, a coal element analysis processor and a coal industrial analysis processor. The device can adapt to the changes of coal types and coal layer thickness and shape on the conveying belt, and maintain stable detection performance index in industrial fields.

Description

Device for detecting compositions of coal on conveying belt in real time
Technical field
The invention belongs to a kind of test technique automatic and nuclear detection technology field, be specifically related to a kind of device for detecting compositions of coal on conveying belt in real time.
Background technology
The coal constituent Fast Detection Technique mainly contains that X fluorescence ultimate analysis of coal technology, laser-induced spectrum are technological, dual intensity gamma analytical technology and neutron wink send out gamma rays analytical technology etc.X fluorescence ultimate analysis of coal technology effective elements measurement range be No. 11 elements (Na) to No. 92 elements (U), and coal granularity and thickness had strict demand, being applied to laboratory environments more more.Laser-induced spectrum technology for detection coal needs the sample circuit sample preparation, and the light path pollution, can not directly detect the raw coal on the conveying belt.Dual intensity gamma analytical technology can not detect the elemental composition of raw coal, can only detect the content of total ash, and accuracy of detection receives the influence of raw coal composition variation.But send out the possible technique that the gamma rays analytical technology is current on-line quick detection raw coal neutron wink.
In sending out gamma rays on-line analysis coal constituent field neutron wink; The advantage that directly detects raw coal composition on the conveying belt is maximum; Can cancel sampling and sample preparation, abandon and gather and process a kind error, also be that requirement is the highest simultaneously; A kind of situation that influenced factor is maximum all exerts an influence to measuring accuracy as coal particles variation, Coal Seam Thickness Change and coal seam surface configuration are irregular etc.At present; Accuracy of detection as the transmission-type detection system of equipment such as Gamma-Metrics, SODERN, Scantech receives the influence of thickness of coal seam and coal seam surface configuration bigger; And the diffuse transmission type detection system exists than mistake when thin in the coal seam, can not detect full face coal in the coal seam again when thicker, and simple transmission-type detects with simple diffuse transmission type and detects; Coal seam section unevenness makes that the weight of each several part coal in detection is different, thereby also measuring accuracy is produced considerable influence.
The content that gamma rays on-line analysis technology can directly detect each Elements C, H, N, S, Si, Al, Ca, Fe, Ti, Na, K, Mg, Cl etc. in the coal is sent out in utilization neutron wink; But in commercial Application; People more are concerned about and what need is the industrial property index of coal, like thermal value, ash, moisture, fugitive constituent, grey composition, ash fusion point etc.Existing situation all is to set up the multivariate regression model of an industrial property index according to the correlativity of industrial property index and each element, thereby realizes the on-line analysis of industrial property index.Problem is, this model all has a coal accommodation, and the error that coal changes the back master mould will enlarge markedly, and the user who is not suitable for often switching coal needs (like the generating plant of great majority burning mixed coal).
Summary of the invention
Goal of the invention: technical matters to be solved by this invention is the deficiency to prior art, for improving coal elements are contained precision and coal proximate analysis precision, a kind of device for detecting compositions of coal on conveying belt in real time is provided.
Technical scheme: the invention discloses a kind of device for detecting compositions of coal on conveying belt in real time, comprise last neutron source and the last gamma ray detectors that is arranged on the conveying belt top and the following neutron source and following gamma ray detectors that are arranged on the conveying belt below; Said upward neutron source and last gamma ray detectors are fixed on the lead block seat, and said neutron source down is fixed on down on the lead block seat with following gamma ray detectors; The said lead block seat that goes up is provided with screen layer outward with following lead block seat; Said go up neutron source and said gamma ray detectors down over against, said neutron source down and said on gamma ray detectors over against; The said gamma ray detectors that goes up is connected the gamma-ray spectrometry analyzer with following gamma ray detectors, ultimate analysis of coal processor and coal proximate analysis processor successively;
Said gamma-ray spectrometry analyzer is used for that signal to last gamma ray detectors and following gamma ray detectors amplifies, filtering and digitized processing form compound gamma-ray spectrometry;
Said ultimate analysis of coal processor is used for analyzing the content of the various elements of coal;
Coal industry constituent analysis device is used to analyze heating value of coal, ash, fugitive constituent, full moisture content, interior moisture content, grey composition, ash fusion point characteristic.
Among the present invention, preferably, the said gamma ray detectors that goes up is the NaI detector with following gamma ray detectors.
Among the present invention, preferably, said upward gamma ray detectors and last neutron source spacing are 300~400mm.
Among the present invention, preferably, said gamma ray detectors down is 300~400mm with following neutron source spacing.
Among the present invention, preferably, the said neutron source that goes up is the isotope neutron source californium with following neutron source 252C f, work quality is 5~20 μ g, upper and lower neutron source californium identical in quality.
Among the present invention, preferably, said screen layer is a high density polyethylene plate surrounding shield layer.
Among the present invention, preferably, said coal proximate analysis processor is connected with a water content detection device.
Beneficial effect: device of the present invention can be installed in coal mining, coal washing, coal blending, coal entrucking shipment, thermal power plant and go into factory's coal, thermal power plant and go on the transmission conveying belt of occasion such as stove coal; Need not the sample circuit sample preparation; The accurate content of elements such as the C in the fast detecting coal on conveying belt, H, N, S, Si, Al, Ca, Fe, Ti, Na, K, Mg, industrial components such as on-line analysis thermal value, ash, grey composition, fugitive constituent, total moisture, interior moisture, ash fusion point.Because the device design is to adopt dineutron source and double detector dislocation symmetric arrangement mode, constructs high-precision transmission-scattering combined type detection system, the element accuracy of detection can not receive the influence of coal cinder granularity and thickness of coal seam and coal seam surface configuration; Because it has set up a plurality of identification models based on the coal characteristic database, the influence that technical analysis index precision is not changed by coal need not be demarcated when changing coal again, but the performance index of device stable for extended periods of time in commercial Application.Production and coal use that the present invention can be coal mining, commercial coal provide coal data promptly and accurately, help to improve resource utilization and energy use efficiency.
Description of drawings
Below in conjunction with figure and embodiment the present invention is done specifying further, above-mentioned and/or otherwise advantage of the present invention will become apparent.
Fig. 1 is the block diagram of system of device for detecting compositions of coal on conveying belt in real time of the present invention.
Fig. 2 is a ultimate analysis of coal performance table.
Fig. 3 is a coal proximate analysis performance table.
Embodiment:
As shown in Figure 1, device for detecting compositions of coal on conveying belt in real time of the present invention is directly installed on industry spot, with coal to be measured 2 noncontacts on the conveying belt 1.Detecting sensor comprises upper and lower neutron source 3a, 3b and upper and lower gamma ray detectors 4a, the 4b of excitation signal; Become the dislocation symmetry be installed in conveying belt directly over under; Construct high-precision transmission-scattering combined type detection system; That is: the line of the last neutron source 3a of conveying belt top and the following gamma ray detectors 4b of conveying belt below, last gamma ray detectors 4a above the conveying belt and the line of the following neutron source 3b below the conveying belt are all perpendicular to conveying belt.The last gamma ray detectors 4a of the last neutron source 3a of conveying belt top and conveying belt top constitutes a diffuse transmission type detection system, and the following gamma ray detectors 4b of the last neutron source 3a of conveying belt top and conveying belt below has constituted a transmission-type detection system simultaneously.Same; The following gamma ray detectors 4b of the following neutron source 3b of conveying belt below and conveying belt below also constitutes a diffuse transmission type detection system, and the last gamma ray detectors 4a of the following neutron source 3b of conveying belt below and conveying belt top has constituted a transmission-type detection system again.
The advantage of so the design detecting sensor is harmonious transmission-type detection system and diffuse transmission type detection system makes device have the stable detection performance, does not receive the influence of coal particles and thickness of coal seam and coal seam surface configuration; Also increased simultaneously the fault freedom of system, neutron source or detector damage some performance index that just reduce system, but system's operate as normal still.
Last neutron source 3a and last gamma ray detectors 4a aggregate erection are on above the conveying belt on the lead block seat 5a; The following neutron source 3b of conveying belt below and following gamma ray detectors 4b aggregate erection are on the following lead block seat 5b below the conveying belt; Last lead block seat 5a is by high density polyethylene plate surrounding shield layer 6 with following lead block seat 5b outside, guarantees that the outer radiation dose of screen layer meets the relevant standard of country.
The installing mechanism of upper and lower neutron source and upper and lower gamma ray detectors all is movable, can install easily and withdraw from.Upper and lower neutron source is the isotope neutron source californium 252C f, upper and lower neutron source californium 252C fIdentical in quality, be 5~20 μ g during operate as normal, because californium 252C fHalf life period is 2.6 years, so will replenish half the californium in per 2.6 years 252C fEnter.Californium 252C fThermal neutron capture reaction takes place in each atoms of elements nuclear in neutron that sends and the coal, emits and the corresponding characteristic gamma rays of element kind.Upper and lower gamma ray detectors is the NaI scintillator detector, surveys the characteristic gamma rays that characterizes each elemental composition in the coal, exports signal to gamma-ray spectrometry analyzer 8 through after certain pre-process.
Gamma-ray spectrometry analyzer 8 is based on the nuclear electron circuit of digital signal processing dsp chip; Link to each other with upper and lower gamma ray detectors; Receive signal from upper and lower gamma ray detectors; Amplify, filtering and digitized processing, form compound gamma-ray spectrometry signal, send ultimate analysis of coal processor 9 to.
Ultimate analysis of coal processor 9 is stylobate Industrial Control Computers in (SuSE) Linux OS; Receive digitized gamma-ray spectrometry signal from gamma-ray spectrometry analyzer 8; After power spectrum correction, peak-seeking and spectrum unscrambling computing, obtain the content of each component C, H, N, S, Si, Al, Ca, Fe, Ti, Na, K, Mg, Cl etc. in the coal.The coal element component content of online acquisition can directly provide to custom system DCS or SIS, or as the basic data of analyzing the coal industry component target, is sent to coal proximate analysis processor 9.
The major function of coal proximate analysis processor 9 is exactly to obtain on the basis of coal constituent content data in real time, and the industrial components index of on-line analysis coal is like thermal value, ash, fugitive constituent, full moisture content, interior moisture content, grey composition, ash fusion point etc.Coal proximate analysis processor 9 is stylobate Industrial Control Computers in Windows NT operating system, links to each other with the ultimate analysis of coal processor.The present invention is under the support of coal characteristic database; Cluster analysis to coal; Promptly set up the multivariate regression model of several coal industry analysis indexs and elemental composition, be applicable to the coal of particular category respectively, according to the real time data of ultimate analysis of coal; System is its coal classification of identification automatically; Carrying out the on-line analysis of coal industry composition, thereby do not have the coal characteristic data to support, carry out coal industry analysis with single model and significantly improved analysis precision with the corresponding multivariate regression model of this classification coal.
In order to obtain high-precision coal industry component target, coal proximate analysis processor 9 also links to each other with coal characteristic database 10 with water content detection device 7 among the present invention.
The online detection coal of water content detection device 7 applied microwave Moisture Meter free surface moisture; And export the coal proximate analysis processor to; Be convenient to coal proximate analysis processor 9 and from the coal total moisture, tell interior moisture and free surface moisture, can realize the conversion of various " bases " such as coal proximate analysis index as received basis, empty butt, dry bases in view of the above.
Coal characteristic database 10 has compiled a large amount of basic datas of each big colliery coal elemental composition of each main place of production of coal in China and industrial components.Coal proximate analysis processor 9 carries out cluster analysis to coal under the support of coal characteristic database 10, can set up the multivariate regression model of several coal industry analysis indexs and elemental composition; Be applicable to the coal of particular category respectively; According to the real time data of ultimate analysis of coal, coal proximate analysis processor 9 is its coal classification of identification automatically, to carry out the on-line analysis of coal industry composition with the corresponding multivariate regression model of this classification coal; Thereby can significantly improve the analysis precision of coal proximate analysis index; When changing coal, also need not demarcate again system, remain stable performance.
Among the present invention; Described water content detection device 7, gamma-ray spectrometry analyzer 8, coal proximate analysis processor 9, coal characteristic database 10 and coal proximate analysis processor 11 are comparatively general product in this area or software section; The present invention's part of core the most is gamma ray detectors and following gamma ray detectors and goes up neutron source and the design of following neutron source, has guaranteed the measuring accuracy of whole checkout equipment.
Like Fig. 2, be test of apparatus of the present invention process and test, the accessible performance index of the online detection of its elemental composition.
Like Fig. 3, be test of apparatus of the present invention process and test, the accessible performance index of the online detection of its industrial components.
The invention provides a kind of thinking and method of device for detecting compositions of coal on conveying belt in real time; The method and the approach of concrete this technical scheme of realization are a lot, and the above only is a preferred implementation of the present invention, should be understood that; For those skilled in the art; Under the prerequisite that does not break away from the principle of the invention, can also make some improvement and retouching, these improvement and retouching also should be regarded as protection scope of the present invention.The all available prior art of each component part not clear and definite in the present embodiment realizes.

Claims (5)

1. device for detecting compositions of coal on conveying belt in real time; It is characterized in that, comprise last neutron source (3a) and last gamma ray detectors (4a) that is arranged on the conveying belt top and following neutron source (3b) and the following gamma ray detectors (4b) that is arranged on the conveying belt below; Said upward neutron source (3a) and last gamma ray detectors (4a) are fixed on the lead block seat (5a), and said neutron source (3b) down and following gamma ray detectors (4b) are fixed on down on the lead block seat (5b); Said lead block seat (5a) and the outer screen layer (6) that is provided with of following lead block seat (5b) gone up; Said go up neutron source and said gamma ray detectors down over against, said neutron source down and said on gamma ray detectors over against; The said gamma ray detectors that goes up is connected with gamma-ray spectrometry analyzer (8), ultimate analysis of coal processor (9) and coal proximate analysis processor (11) with following gamma ray detectors successively;
Said gamma-ray spectrometry analyzer (8) is used for that signal to last gamma ray detectors and following gamma ray detectors amplifies, filtering and digitized processing form compound gamma-ray spectrometry;
Said ultimate analysis of coal processor (9) is used for analyzing the content of the various elements of coal;
Coal industry constituent analysis device (11) is used to analyze heating value of coal, ash, fugitive constituent, full moisture content, interior moisture content, grey composition, ash fusion point characteristic;
Said upward gamma ray detectors (4a) and following gamma ray detectors (4b) are the NaI detector;
The said neutron source that goes up is the isotope neutron source californium with following neutron source 252C f, quality is 5~20 μ g.
2. device for detecting compositions of coal on conveying belt in real time according to claim 1 is characterized in that, said upward gamma ray detectors and last neutron source spacing are 300~400mm.
3. device for detecting compositions of coal on conveying belt in real time according to claim 1 is characterized in that, said gamma ray detectors down is 300~400mm with following neutron source spacing.
4. device for detecting compositions of coal on conveying belt in real time according to claim 1 is characterized in that, said screen layer (6) is a high density polyethylene plate surrounding shield layer.
5. device for detecting compositions of coal on conveying belt in real time according to claim 1 is characterized in that, said coal proximate analysis processor is connected with a water content detection device (7).
CN200910181428XA 2009-07-16 2009-07-16 Device for detecting compositions of coal on conveying belt in real time Expired - Fee Related CN101603929B (en)

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