CN102608141A - On-line analysis device of pulsed neutron coal element content and proximate analysis indexes - Google Patents
On-line analysis device of pulsed neutron coal element content and proximate analysis indexes Download PDFInfo
- Publication number
- CN102608141A CN102608141A CN2012100798012A CN201210079801A CN102608141A CN 102608141 A CN102608141 A CN 102608141A CN 2012100798012 A CN2012100798012 A CN 2012100798012A CN 201210079801 A CN201210079801 A CN 201210079801A CN 102608141 A CN102608141 A CN 102608141A
- Authority
- CN
- China
- Prior art keywords
- coal
- neutron
- detector
- pulsed
- bgo
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Landscapes
- Analysing Materials By The Use Of Radiation (AREA)
Abstract
The invention belongs to the technical field of nucleus technology application, and relates to an on-line analysis device of pulsed neutron coal element content and proximate analysis indexes. The on-line analysis device comprises a radiation protector, a coal conveying channel and a detection device; the coal conveying channel and the detection device are arranged in the radiation protector; the detection device is positioned below the coal conveying channel; the detection device comprises a neutron detector, a pulsed D-T neutron generator and a BGO (bismuth germanium oxide) detector and is characterized in that a lead plate a, a polyethylene plate and a lead plate b are sequentially arranged between the pulsed D-T neutron generator and the BGO detector; and the BGO detector is positioned in a BGO detector constant temperature control system, with a temperature range kept at -4.5 DEG C to -5.5 DEG C. According to the invention, the on-line analysis device is not influenced by parameters such as changes of coal type, speeds of a belt for conveying coal, thickness changes of coal seams, particle sizes of coal and the like, so that the precision for measuring parameters of coal property is high.
Description
Technical field
The invention belongs to the Application of Nuclear Technology field, relating to a kind of is neutron source with pulsed D-T neutron generator, the device of online express-analysis coal essential element content and technical analysis index.
Background technology
Using pulsed D-T neutron generator is one of Application of Nuclear Technology hot research fields as neutron source online express-analysis coal constituent content and technical analysis index.Its principle is with the coal on fast, the thermal neutron irradiation coal conveyer belt of pulsed D-T neutron generator emission, the atomic nucleus in the coal and these neutron generation inelastic scattering and radiation capture reaction, and discharge and send out the characteristic gamma ray wink.The energy of characteristic gamma ray can be confirmed the element kind; The tale of characteristic gamma ray can be calculated constituent content, can real-time analysis go out technical analysis indexs such as the thermal value of coal, full sulphur, ash content, fugitive constituent, fixed carbon, moisture according to essential element content.Geometric configuration commonly used is generally reflective (D-T neutron generator and gamma-ray detector are positioned at a side of coal conveyer belt) and transmission-type (D-T neutron generator and gamma-ray detector are positioned at the both sides of coal conveyer belts).Because the coal thickness of on-line analysis is bigger, and unstable, generally adopt reflectively, promptly D-T neutron generator and gamma-ray detector are positioned at the below of coal conveyer belts.This design not only can be eliminated the influence of coal thickness, can also improve the efficiency of measurement of gamma ray, improves measuring accuracy.But there are two subject matters in this design:
1, D-T neutron generator and gamma-ray detector are positioned at a side of coal conveyer belts; Distance between the two is very little, and the neutron energy that the D-T neutron generator produces is 14.1 MeV, if shine directly on the gamma-ray detector; Not only big to its damage; Also, produce gamma ray, influence the measuring accuracy of coal constituent content with its inner element generation nuclear reaction.
2, BGO (bismuth germanium oxide) detector is the gamma-ray detector of using always, and its detection efficiency receives Influence of Temperature very big.Online detection belongs to outdoor detection basically, and the temperature of BGO detector is difficult to control.
Summary of the invention
The purpose of this invention is to provide a kind of pulsed neutron coal constituent content and technical analysis index on-line analysis device; Technical matters to be solved is the fast neutron flux that reduces in the BGO detector, and makes BGO detector operation temperature stabilization between-4.5 ℃ ~-5.5 ℃.
In order to realize above-mentioned target; The technical solution adopted for the present invention to solve the technical problems: pulsed neutron coal constituent content and technical analysis index on-line analysis device; Mainly comprise coal transfer passage and sniffer in radiation protection body, the radiation protection body, sniffer is positioned at the below of coal transfer passage; Sniffer comprises neutron detector, pulsed D-T neutron generator and BGO detector, and it is characterized in that has stereotype a, polyethylene board and stereotype b successively between pulsed D-T neutron generator and the BGO detector; The BGO detector places in the BGO detector thermostatic control system.
Usually, BGO detector thermostatic control system of the present invention comprises Dewar flask, vapor pressure formula refrigeration system and temperature controller; The BGO detector places in the Dewar flask of BGO detector thermostatic control system.
A kind of preferable scheme is that the thickness of the stereotype a between said pulsed D-T neutron generator and the BGO detector, polyethylene board and stereotype b is respectively 6cm, 11cm and 8cm.
Described radiation protection body comprises lead layer, polyethylene layer, cadmium layer and iron layer from inside to outside successively.
Said coal transfer passage comprises coal conveyer belt and back up pad.
The design feature of the present invention technology and effect be as follows:
1. the radiation protection body is mainly by lead layer, polyethylene layer, and cadmium layer and iron layer are formed, and can make this device radiation dose on every side satisfy the requirement of national GB18871-2002 " ionization radiation protection and radiation source safety basic standard ".Lead layer both can make neutron energy be reduced to about 2 MeV from 14.1 MeV fast, can also shield carbon, oxygen characteristic gamma ray in the tygon, prevented that it from getting into the measuring accuracy that the BGO detector influences carbon in the coal, oxygen.Polyethylene layer is slowing down, thermalized neutron further, simultaneously also can the absorption portion thermal neutron, and remaining thermal neutron will be absorbed by the cadmium layer.The iron layer both can protective device inner device, can also shield gamma ray, reduce the radiation dose around the device.
2. the BGO detector is placed in the BGO detector thermostatic control system, can utilize vapor pressure formula refrigeration system, and Dewar flask and temperature controller make its temperature stabilization between-4.5 ℃ ~-5.5 ℃.The temperature of BGO detector remains in this scope, both can improve the detection efficiency of BGO detector, can also prevent that the gamma spectra peak position from drifting about with the temperature variation of BGO detector.
3. the stereotype a that places successively between pulsed D-T neutron generator and the BGO detector; Polyethylene board and stereotype b; Both can reduce the fast neutron flux in the BGO detector; Can also shield carbon, oxygen characteristic gamma ray in the polyethylene board, prevent that it from getting into the measuring accuracy that the BGO detector influences carbon in the coal, oxygen.The neutron energy that the D-T neutron generator produces is 14.1MeV; If shine directly on the BGO detector, not only the damage to detector is big, oxygen generation inelastic scattering reaction that also will be inner with it; Discharge the characteristic gamma ray, the serious low oxygen element measuring accuracy in the coal that influenced.The thickness of stereotype a is 6cm, can make the energy of most of neutron be reduced to 2 MeV rapidly, and then with the thick stereotype b of the thick polyethylene board of 11cm and 8cm to the further slowing down of these neutrons, absorption.With do not have stereotype a, polyethylene board and stereotype b ratio, the neutron that can arrive the BGO detector is about 9.1%, the neutron that energy is higher than 6.4MeV (the inelastic scattering threshold of reaction of oxygen element) is lower than 0.8%.
The invention has the beneficial effects as follows; Through the stereotype a between design BGO detector thermostatic control system and pulsed D-T neutron generator and the BGO detector, polyethylene board and stereotype b can improve detection efficiency; Avoid peak shift; Reduce the neutron flux in the BGO detector, the carbon, the oxygen characteristic gamma ray that reduce in the polyethylene board get into the BGO detector, thereby have improved the precision of ultimate analysis of coal significantly; Thereby improved the precision of technical analysis index, made it reach the requirement of online detection.
Description of drawings
Below in conjunction with accompanying drawing and embodiment, further the present invention will be described.
Among the figure, 1-cadmium layer; The 2-lead layer; The 3-neutron detector; 4-pulsed D-T neutron generator; 5-stereotype a; The 6-polyethylene board; 7-stereotype b; 8-BGO detector thermostatic control system; The 9-BGO detector; The 10-polyethylene layer; 11-iron layer; The 12-coal conveyer belt; 13-coal; The 14-back up pad; The 15-Dewar flask; 16-vapor pressure formula refrigeration system; The 17-temperature controller.
Embodiment
Embodiment: the present embodiment structure, shown in accompanying drawing 1, mainly comprise coal transfer passage and sniffer in radiation protection body, the radiation protection body, sniffer is positioned at the below of coal transfer passage; Sniffer comprises neutron detector (3), pulsed D-T neutron generator (4) and BGO detector (9), and it mainly improves is that stereotype a (5), polyethylene board (6) and stereotype b (7) are arranged between pulsed D-T neutron generator (4) and the BGO detector (9) successively; BGO detector (9) places in the BGO detector thermostatic control system (8).
Among the embodiment, shown in accompanying drawing 1, the radiation protection body is lead layer (2) from inside to outside successively, polyethylene layer (10), and cadmium layer (1) and iron layer (11), other parts all are positioned at the inside of lead layer (2).Coal (13) is positioned at the top of coal conveyer belt (12), and coal conveyer belt (12) is the direction slip inwards of vertical paper in back up pad (14) upper edge.Neutron detector (3), pulsed D-T neutron generator (4), stereotype a (5), polyethylene board (6), stereotype b (7) and BGO detector (9) all are positioned at the below of back up pad (14), and supported plate (14) is being protected.
Among Fig. 2, BGO detector thermostatic control system (8) is made up of Dewar flask (15), vapor pressure formula refrigeration system (16) and temperature controller (17).BGO detector (9) is positioned at Dewar flask (15), and temperature remains between-4.5 ℃ ~-5.5 ℃.
The neutron that pulsed D-T neutron generator (4) produces, if can get into coal (13), atomic nucleus generation nuclear reaction that will be inner with coal (13); If directive BGO detector (9); In communication process successively by stereotype a (5); Polyethylene board (6); Stereotype b (7) slowing down, absorption, the threshold value that the neutron energy of arrival BGO detector (9) nearly all reacts less than the oxygen element inelastic scattering is to the almost not influence of measurement of coal oxygen content; The neutron of other direction of directive is successively by lead layer (2), polyethylene layer (10), and cadmium layer (1), iron layer (11) slowing down absorbs.
The characteristic gamma ray that element in the coal (13) and neutron effect produce if directive BGO detector (9) will be surveyed by BGO detector (9), and is used to calculate the content of coal element; If other direction of directive will be successively by lead layer (2), polyethylene layer (10), cadmium layer (1), iron layer (11) absorbs.
The characteristic gamma ray that carbon in the polyethylene layer (10), two kinds of elements of oxygen and neutron effect produce if directive BGO detector (9) will be absorbed by stereotype b (7), can't arrive BGO detector (9); If other direction of directive will be absorbed, to not influence of measuring accuracy.
The characteristic gamma ray that carbon in the polyethylene board (6), two kinds of elements of oxygen and neutron effect produce if directive lead layer (2) inside will be absorbed by lead layer (2), does not influence measuring accuracy; If other direction of directive also will be absorbed.
Claims (6)
1. pulsed neutron coal constituent content and technical analysis index on-line analysis device comprise coal transfer passage and sniffer in radiation protection body, the radiation protection body, and sniffer is positioned at the below of coal transfer passage; Sniffer comprises neutron detector, pulsed D-T neutron generator and BGO detector, and it is characterized in that has stereotype a, polyethylene board and stereotype b successively between pulsed D-T neutron generator and the BGO detector; The BGO detector places in the BGO detector thermostatic control system.
2. pulsed neutron coal constituent content according to claim 1 and technical analysis index on-line analysis device is characterized in that BGO detector thermostatic control system comprises Dewar flask, vapor pressure formula refrigeration system and temperature controller.
3. pulsed neutron coal constituent content according to claim 1 and 2 and technical analysis index on-line analysis device is characterized in that the BGO detector places in the Dewar flask of BGO detector thermostatic control system.
4. pulsed neutron coal constituent content according to claim 1 and technical analysis index on-line analysis device is characterized in that the thickness of stereotype a, polyethylene board and stereotype b between pulsed D-T neutron generator and the BGO detector is respectively 6cm, 11cm and 8cm.
5. pulsed neutron coal constituent content according to claim 1 and technical analysis index on-line analysis device is characterized in that the radiation protection body comprises lead layer, polyethylene layer, cadmium layer and iron layer from inside to outside successively.
6. pulsed neutron coal constituent content according to claim 1 and technical analysis index on-line analysis device is characterized in that the coal transfer passage comprises coal conveyer belt and back up pad.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012100798012A CN102608141A (en) | 2012-03-23 | 2012-03-23 | On-line analysis device of pulsed neutron coal element content and proximate analysis indexes |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012100798012A CN102608141A (en) | 2012-03-23 | 2012-03-23 | On-line analysis device of pulsed neutron coal element content and proximate analysis indexes |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102608141A true CN102608141A (en) | 2012-07-25 |
Family
ID=46525689
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012100798012A Pending CN102608141A (en) | 2012-03-23 | 2012-03-23 | On-line analysis device of pulsed neutron coal element content and proximate analysis indexes |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102608141A (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102879409A (en) * | 2012-10-31 | 2013-01-16 | 南京龙源环保有限公司 | Ray protection structure for on-line analysis device of content of pulse neutron coal elements and technical analysis index |
| CN106872661A (en) * | 2017-02-08 | 2017-06-20 | 中国神华能源股份有限公司 | Coal property test device |
| CN107290368A (en) * | 2016-03-31 | 2017-10-24 | 丹东东方测控技术股份有限公司 | The application process of the reflective online cement slurry sulfurbased NPK analyzer of neutron activation |
| CN107290371A (en) * | 2016-03-31 | 2017-10-24 | 丹东东方测控技术股份有限公司 | The reflective online neutron activation sulfurbased NPK analytical equipment of cement slurry and analysis method |
| CN107290367A (en) * | 2016-03-31 | 2017-10-24 | 丹东东方测控技术股份有限公司 | The online neutron activation sulfurbased NPK analytical equipment of transmission-type cement slurry and analysis method |
| CN107290364A (en) * | 2016-03-31 | 2017-10-24 | 丹东东方测控技术股份有限公司 | The application process of the online cement slurry sulfurbased NPK analyzer of transmission-type neutron activation |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3955087A (en) * | 1974-09-04 | 1976-05-04 | G. D. Searle & Co. | Apparatus for measuring moisture in moving bulk material using a lithium-7 radiation source |
| GB2100421A (en) * | 1981-05-11 | 1982-12-22 | Atomic Energy Of Australia | Neutron method for elemental analysis independent of bulk density |
| CN102095741A (en) * | 2011-01-10 | 2011-06-15 | 长沙开元仪器股份有限公司 | Method for detecting coal quality composition on conveying belt and device thereof |
| CN102175702A (en) * | 2010-11-22 | 2011-09-07 | 贾文宝 | Online detecting device of coal components |
-
2012
- 2012-03-23 CN CN2012100798012A patent/CN102608141A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3955087A (en) * | 1974-09-04 | 1976-05-04 | G. D. Searle & Co. | Apparatus for measuring moisture in moving bulk material using a lithium-7 radiation source |
| GB2100421A (en) * | 1981-05-11 | 1982-12-22 | Atomic Energy Of Australia | Neutron method for elemental analysis independent of bulk density |
| CN102175702A (en) * | 2010-11-22 | 2011-09-07 | 贾文宝 | Online detecting device of coal components |
| CN102095741A (en) * | 2011-01-10 | 2011-06-15 | 长沙开元仪器股份有限公司 | Method for detecting coal quality composition on conveying belt and device thereof |
Non-Patent Citations (1)
| Title |
|---|
| 全国卫生专业技术资格考试专家委员会编写: "《2003年 卫生专业技术资格考试指南 预防医学专业（医师类）（上）》", 28 February 2003, 知识出版社 * |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102879409A (en) * | 2012-10-31 | 2013-01-16 | 南京龙源环保有限公司 | Ray protection structure for on-line analysis device of content of pulse neutron coal elements and technical analysis index |
| CN102879409B (en) * | 2012-10-31 | 2014-06-18 | 南京龙源环保有限公司 | Ray protection structure for on-line analysis device of content of pulse neutron coal elements and technical analysis index |
| CN107290368A (en) * | 2016-03-31 | 2017-10-24 | 丹东东方测控技术股份有限公司 | The application process of the reflective online cement slurry sulfurbased NPK analyzer of neutron activation |
| CN107290371A (en) * | 2016-03-31 | 2017-10-24 | 丹东东方测控技术股份有限公司 | The reflective online neutron activation sulfurbased NPK analytical equipment of cement slurry and analysis method |
| CN107290367A (en) * | 2016-03-31 | 2017-10-24 | 丹东东方测控技术股份有限公司 | The online neutron activation sulfurbased NPK analytical equipment of transmission-type cement slurry and analysis method |
| CN107290364A (en) * | 2016-03-31 | 2017-10-24 | 丹东东方测控技术股份有限公司 | The application process of the online cement slurry sulfurbased NPK analyzer of transmission-type neutron activation |
| CN106872661A (en) * | 2017-02-08 | 2017-06-20 | 中国神华能源股份有限公司 | Coal property test device |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102608141A (en) | On-line analysis device of pulsed neutron coal element content and proximate analysis indexes | |
| CN102928867A (en) | Compensation type neutron dose instrument | |
| CN201917533U (en) | Coal composition on-line detection device | |
| CN102841106A (en) | Transmission-type online detection device for coal characteristic indexes | |
| US20190179041A1 (en) | Moderated neutron sensor | |
| CN202771002U (en) | Spherical high energy neutron probe | |
| WO2014107215A3 (en) | Method and apparatus for neutron detection utilizing pulse height discrimination and pulse shape discrimination | |
| JP2015087115A5 (en) | ||
| CN202676634U (en) | Online analyzing device of pulse neutron coal element content and industrial analysis index | |
| CN102176047B (en) | Neutron personal dosimeter with energy compensation | |
| CN102590252A (en) | Device for rapidly detecting iron content of iron ore by utilizing D-D neutron generator | |
| CN201828425U (en) | Coal quality sampling analyzer with pulse neutrons | |
| CN101335061B (en) | Fuel Damage Delayed Neutron Detection Device | |
| CN111880213A (en) | Nuclear fuel rod based on D-D neutron source235U enrichment degree and uniformity detection method | |
| CN203299092U (en) | Beta-ray-compensation-method-based device for measuring concentration of particulate matters | |
| CN206194691U (en) | Ionization chamber is distinguishd to harmless real -time position of synchrotron radiation soft X -ray | |
| JP4922208B2 (en) | Neutron measuring apparatus and neutron measuring method | |
| CN202066972U (en) | Personal neutron dosimeter with energy compensation | |
| CN106783502A (en) | A kind of lossless real time position of Synchrotron Radiation Soft X ray differentiates ionisation chamber | |
| CN203025120U (en) | Online ash content detecting device | |
| RU153190U1 (en) | LEAKAGE CONTROL SYSTEM OF HEATING FUEL CELLS | |
| CN114545485B (en) | Copper slag component content detection device based on neutron activation gamma energy spectrum analysis | |
| CN217133392U (en) | Detection device for special nuclear materials | |
| Drobizhev et al. | Neutron Transmutation Doped (NTD) Germanium Thermistors for CUPID | |
| GB1180450A (en) | Arrangements for Determining the Moisture Content of Solid Substances by means of Neutron Irradiation |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20120725 |