CN102980904A - Double-neutron-source coal quality online analyzer - Google Patents
Double-neutron-source coal quality online analyzer Download PDFInfo
- Publication number
- CN102980904A CN102980904A CN2011102616885A CN201110261688A CN102980904A CN 102980904 A CN102980904 A CN 102980904A CN 2011102616885 A CN2011102616885 A CN 2011102616885A CN 201110261688 A CN201110261688 A CN 201110261688A CN 102980904 A CN102980904 A CN 102980904A
- Authority
- CN
- China
- Prior art keywords
- neutron
- coal
- neutron generator
- bgo
- direct current
- 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 relates to a double-neutron-source coal quality online analyzer which can carry out online, rapid, and accurate analysis upon coal quality. According to the invention, a direct-current D-T neutron generator and a direct-current D-D neutron generator are used for replacing a pulse D-T neutron generator, such that 73.3% of the measuring time can be reduced. A BGO detector is placed in a BGO positioning device; 10cm-thick coal is placed between the BGO detector and the D-D neutron generator. With the design, capture spectrum measuring error can be reduced. Another BGO detector is placed in the positioning device thereof. 6cm-thick coal and 8cm-thick lead are placed between the BGO detector and the D-T neutron generator. With the design, full-spectrum measuring error can be reduced. With the 8cm-thick lead, gamma rays produced by the effect between internal substances of the neutron generator and neutrons can be prevented from entering the BGO detector, such that measuring precision is greatly improved.
Description
Technical field
The present invention relates to a kind ofly take D-T and D-D neutron generator as neutron source, to the instrument that ature of coal is carried out online express-analysis, belong to the Application of Nuclear Technology field.
Background technology
Be neutron source with pulsed D-T neutron generator, online express-analysis ature of coal (mainly comprising constituent content and Lower heat value, total moisture, ash content, fugitive constituent) is a large study hotspot in Application of Nuclear Technology field.Its principle is: with the neutron irradiation coal sample of pulsed D-T neutron generator emission, with the reaction of atomic nucleus generation inelastic scattering in the coal (mainly comprising two kinds of elements of C, O) and radiation capture reaction (other element), and discharge and send out the feature gamma ray wink.Utilize the energy of feature gamma ray to determine the element kind, utilize the tale Computing Meta cellulose content of feature gamma ray, the recycling constituent content calculates Lower heat value, total moisture, ash content and the fugitive constituent of coal.
Take the recurrence interval as 300 μ s as example, the mode of operation of pulsed D-T neutron generator power supply is generally: power supply is elevated to high pressure (about 100KV) to the voltage of 220V in 0～10 μ s, the D-T neutron generator discharges neutron hardly; Keep high pressure constant between 10～90 μ s, the D-T neutron generator discharges the 14MeV fast neutron; In 90～100 μ s high pressure is reduced to 220V, the D-T neutron generator discharges neutron hardly, but also has fast, thermal neutron in the coal sample; Keep low-voltage (about 220V) between 100～300 μ s, the D-T neutron generator does not discharge neutron, and coal sample also exists fast, thermal neutron between 100～220 μ s, almost only have thermal neutron between 220～300 μ s.
When 10～90 μ s, the D-T neutron generator discharges the 14MeV fast neutron, and with coal in atomic nucleus generation inelastic scattering, the thermal neutron after the slowing down and the atomic nucleus generation radiative capture in the coal, the stack spectral of these two kinds of gamma rays is referred to as full spectrum.So only have 80 μ s, the detection time of capture spectrum (gamma ray spectroscopy that radiative capture discharges) also to only have 80 μ s (220～300 μ s) detection time of full spectrum.
As can be seen from the above analysis, take pulsed D-T neutron generator as neutron source ature of coal is carried out express-analysis following two obvious shortcomings is arranged:
1. Measuring Time is long: in each sense cycle, all only have 80 μ s the detection time of full spectrum and capture spectrum, is 26.7% of the cycle only, wasted a large amount of time, increased Measuring Time.
2. systematic error is large: take 15 minutes detection times as example, power supply need to change 3 * 10 between high pressure and low pressure
6Inferior, although it is very little to change caused error at every turn, the error of accumulative total is still larger.
The thermal-neutron capture cross-section of C, two kinds of elements of O is very little in the coal, need to analyze its content with the gamma ray (non-bullet spectrum) that the inelastic scattering reaction discharges.Their threshold value is respectively 4.8MeV and 6.4MeV, so usually select D-T neutron generator (neutron energy of release is 14MeV) to be neutron source.
The thermal-neutron capture cross-section of the elements such as coal H, N, S, Si, Al, Fe, Ca, Mg is larger, generally analyzes their content with capture spectrum, needs thermal neutron.In coal analysis, thermal neutron can come from the slowing down of fast neutron, also can come from thermal source.The isotope thermal source is owing to have and can not turn-off, and the shortcomings such as difficult protection are not suitable for the on-line analysis of ature of coal.
The average neutron energy that the D-D neutron howitzer discharges is 2.5MeV, and well below the threshold value of the non-bullet reaction of two kinds of elements of C, O, the cross section that non-bullet reaction occurs with other element in the coal is also very little.When the 2.5MeV neutron enters in the coal, pass through multiple elastic scattering, energy is reduced to thermal neutron, is captured by elements such as H, N, S, Si, Al, Fe, Ca, Mg, and discharges prompt fission gammas's ray (capture spectrum).So the D-D neutron howitzer can be used as the thermal source of coal analysis.
The gamma spectra that obtains take direct current D-T neutron generator as neutron source is the same in the full spectrum that 10～90 μ s produce with pulsed D-T neutron generator; The gamma spectra that obtains take direct current D-D neutron generator as neutron source, and pulsed D-T neutron generator is similar at the capture spectrum that 220～300 μ s produce.So, in the on-line analysis of ature of coal, can replace pulsed D-T neutron generator with the combination of direct current D-T generator and direct current D-D neutron generator.But, up to the present also do not have unit that they were carried out concrete research.
Summary of the invention
The deficiency of existing in order to overcome " pulse neutron coal in-line analyzer " the invention provides a kind of " dineutron source ature of coal in-line analyzer ", and technical matters to be solved is to shorten detection time, reduces systematic error.
In order to realize above-mentioned target, the technical solution adopted in the present invention is:
(1) shortening of detection time
In order to shorten detection time, full spectrum detection system and capture spectrum detection system have been set up respectively.Full spectrum detection system mainly comprises direct current D-T neutron generator, BGO detector, BGO steady arm, multi-channel card (MCA), main amplifier.The capture spectrum detection system mainly comprises direct current D-D neutron generator, BGO detector, BGO steady arm, multi-channel card (MCA), main amplifier.Full spectrum and capture spectrum enter in the computing machine simultaneously, by processing the indices of rear output ature of coal." pulse neutron coal in-line analyzer " compared, and shortened 73.3% detection time.
(2) reduction of systematic error
For the non-bullet gamma ray that shields D-T neutron generator inner material and neutron effect generation enters coal bin and BGO detector, the thick lead of 8cm is arranged between D-T neutron generator and the coal bin, if lead is too thick, although the effect of shielding gamma ray is good, but the fast neutron that enters coal bin is few, is unfavorable for detecting carbon, two kinds of elements of oxygen; If lead is too thin, do not have the effect of shielding gamma ray.
In the detection of full spectrum, the feature gamma ray number of carbon, two kinds of elements of oxygen is 6.2cm in thickness of coal seam, reaches respectively maximal value during 5.3cm.Therefore, the thickness in coal seam at 5.3cm to more suitable between the 6.2cm.Through test of many times, the thickness in coal seam is chosen as 6.0cm.
In the measurement of capture spectrum, the feature gamma ray number of Si, Al, Fe, Ca, Mg reaches maximal value when thickness of coal seam is respectively 10.1cm, 1.5cm, 10.4cm, 11.6cm, 9.8cm.Therefore, when thickness of coal seam was the 10cm left and right sides, the gamma of Si, Fe, Ca, Mg counting reached optimum value; When thickness of coal seam was 1.5cm, the gamma of aluminium counting reached optimum value.Because the thermal-neutron capture cross-section larger (232mb) of aluminium, gamma counting many (being 2.2～105.0 times that other elemental characteristic gamma is counted) is so thickness of coal seam finally is chosen as 10cm.
In the transmission course of coal, thickness of coal seam generally all surpasses 10cm, and in order to satisfy the detection of full spectrum and capture spectrum, the present invention has utilized two BGO steady arms.In order to eliminate the interference between full spectrum and the capture spectrum, the distance between two BGO steady arms surpasses 3m.
Description of drawings
Below in conjunction with drawings and Examples, further the present invention will be described.
Accompanying drawing 1 is block diagram of the present invention.
Among Fig. 1,1. direct current D-D neutron generator, 2. coal transport tape, 3. plumbous, 4. direct current D-T neutron generator, 5.BGO detector, 6.BGO detector, 7.BGO steady arm, 8.BGO steady arm, 9. main amplifier, 10. multi-channel card (MCA), 11. main amplifiers, 12.MCA, 13. computing machine, 14. coals.
Accompanying drawing 2 is perspective views of BGO steady arm.
Embodiment
Among Fig. 1, coal transport tape (2) and coal (14) is uniform motion from left to right, BGO steady arm (7) makes the dead in line of BGO detector (5) and direct current D-D neutron generator (1), and it is constant to make between the two thickness of coal seam remain on 10cm.The 2.5MeV neutron irradiation that direct current D-D neutron generator (1) produces is in coal (14), the capture spectrum that produces is surveyed by BGO detector (5), arrive main amplifier (9) through cable transmission, amplification is arrived multi-channel card (10) by cable transmission, multi-channel card (10) is accepted it by ray energy, and is stored in the computing machine (13).
Between direct current D-T neutron generator (4) and the coal transport tape (2) the thick lead of 8cm (3) is arranged, BGO steady arm (8) makes the dead in line of BGO detector (6) and direct current D-T neutron generator (4), and it is constant to make between the two distance remain on 14cm.The 14MeV neutron irradiation that direct current D-T neutron generator (4) produces is in coal (14), the full spectrum that produces is surveyed by BGO detector (6), arrive main amplifier (11) through cable transmission, amplification is arrived multi-channel card (12) by cable transmission, multi-channel card (12) is accepted it by ray energy, and is stored in the computing machine (13).
After detecting end, computing machine (13) is processed the data of full spectrum and capture spectrum simultaneously, then exports the indices of ature of coal.
Claims (3)
1. dineutron source ature of coal in-line analyzer, BGO detector (5) is placed in the BGO steady arm (7), dead in line with direct current D-D neutron generator (1), BGO detector (6) is placed in the BGO steady arm (8), dead in line with direct current D-T neutron generator (4), it is characterized in that: direct current D-D neutron generator (1) and BGO detector (5) are used for measuring capture spectrum, and direct current D-T neutron generator (4) and BGO detector (6) are used for measuring full spectrum.
2. dineutron according to claim 1 source ature of coal in-line analyzer, it is characterized in that: measure capture spectrum take direct current D-D neutron generator (1) as neutron source, the thickness of coal seam between BGO detector (5) and the direct current D-D neutron generator (1) is 10cm.
3. dineutron according to claim 1 source ature of coal in-line analyzer, it is characterized in that: measure full spectrum take direct current D-T neutron generator (4) as neutron source, coal seam and the thick lead (3) of 8cm of 6cm is arranged between BGO detector (6) and the direct current D-T neutron generator (4).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011102616885A CN102980904A (en) | 2011-09-06 | 2011-09-06 | Double-neutron-source coal quality online analyzer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011102616885A CN102980904A (en) | 2011-09-06 | 2011-09-06 | Double-neutron-source coal quality online analyzer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102980904A true CN102980904A (en) | 2013-03-20 |
Family
ID=47855124
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011102616885A Pending CN102980904A (en) | 2011-09-06 | 2011-09-06 | Double-neutron-source coal quality online analyzer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102980904A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108051465A (en) * | 2018-01-26 | 2018-05-18 | 吉林大学 | A kind of Atomic Absorption SpectrophotometerICP neutron activation wink sent out gamma ray deferred and combined |
| CN110894785A (en) * | 2019-08-21 | 2020-03-20 | 中国石油大学(北京) | Epithermal neutron porosity logging method and equipment |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2219854B (en) * | 1985-09-18 | 1990-05-02 | Cogent Ltd | Coal analysis |
| US6362477B1 (en) * | 1997-12-10 | 2002-03-26 | Commonwealth Scientific And Industrial Research Organisation | Bulk material analyser for on-conveyor belt analysis |
| CN2496019Y (en) * | 2001-09-30 | 2002-06-19 | 南京瞬发科技应用研究所 | Coal sample container and coal quatity detecting apparatus therewith |
| CN201828425U (en) * | 2010-07-13 | 2011-05-11 | 长春工业大学 | Coal quality sampling analyzer with pulse neutrons |
| CN201917533U (en) * | 2010-11-22 | 2011-08-03 | 贾文宝 | Coal composition on-line detection device |
| CN202305438U (en) * | 2011-09-06 | 2012-07-04 | 长春工业大学 | Double-neutron-source coal on-line analyzer |
-
2011
- 2011-09-06 CN CN2011102616885A patent/CN102980904A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2219854B (en) * | 1985-09-18 | 1990-05-02 | Cogent Ltd | Coal analysis |
| US6362477B1 (en) * | 1997-12-10 | 2002-03-26 | Commonwealth Scientific And Industrial Research Organisation | Bulk material analyser for on-conveyor belt analysis |
| CN2496019Y (en) * | 2001-09-30 | 2002-06-19 | 南京瞬发科技应用研究所 | Coal sample container and coal quatity detecting apparatus therewith |
| CN201828425U (en) * | 2010-07-13 | 2011-05-11 | 长春工业大学 | Coal quality sampling analyzer with pulse neutrons |
| CN201917533U (en) * | 2010-11-22 | 2011-08-03 | 贾文宝 | Coal composition on-line detection device |
| CN202305438U (en) * | 2011-09-06 | 2012-07-04 | 长春工业大学 | Double-neutron-source coal on-line analyzer |
Non-Patent Citations (3)
| Title |
|---|
| C.S. LIM: "An on-belt elemental analyser for the cement industry", 《APPLIED RADIATION AND ISOTOPES》, vol. 54, 31 December 2001 (2001-12-31), pages 11 - 19, XP004224048, DOI: doi:10.1016/S0969-8043(00)00180-9 * |
| DESHAN GU: "Rapid Analysis of Coal Properties", 《IEEE INSTRUMENTATION & MEASUREMENT MAGAZINE》, vol. 8, no. 5, 31 December 2005 (2005-12-31), pages 22 - 27 * |
| 谷德山等: "脉冲中子煤质快速分析仪的研制与应用", 《同位素》, vol. 18, no. 12, 31 May 2005 (2005-05-31), pages 87 - 90 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108051465A (en) * | 2018-01-26 | 2018-05-18 | 吉林大学 | A kind of Atomic Absorption SpectrophotometerICP neutron activation wink sent out gamma ray deferred and combined |
| CN110894785A (en) * | 2019-08-21 | 2020-03-20 | 中国石油大学(北京) | Epithermal neutron porosity logging method and equipment |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN201917533U (en) | Coal composition on-line detection device | |
| CN106990429A (en) | A kind of γ, neutron dual-beam spectral measurement device and measuring method | |
| Cazzaniga et al. | Response of LaBr3 (Ce) scintillators to 2.5 MeV fusion neutrons | |
| Liu et al. | Measurement of the neutron total cross section of carbon at the Back-n white neutron beam of CSNS | |
| Wen et al. | Measurement of the U-238/U-235 fission cross section ratio at CSNS–Back-n WNS | |
| CN102095741A (en) | Method for detecting coal quality composition on conveying belt and device thereof | |
| CN202305438U (en) | Double-neutron-source coal on-line analyzer | |
| CN201828425U (en) | Coal quality sampling analyzer with pulse neutrons | |
| CN117907370A (en) | Neutron activation multi-element analysis device based on digital multi-channel gamma spectrometer | |
| CN102980904A (en) | Double-neutron-source coal quality online analyzer | |
| CN109143319B (en) | By CeF 3 Neutron detection method and equipment for reducing gamma-ray interference by scintillator | |
| CN201130158Y (en) | Dispersion type coal composition real time on-line detecting device | |
| US10359522B2 (en) | Phoswich detector with fast neutron spectroscopy function | |
| Elnimr et al. | Low Energy 8B Solar Neutrinos with the Wideband Intelligent Trigger at Super-Kamiokande | |
| CN2453436Y (en) | Online analysing device for components in coal fed into furnace of power plant | |
| CN102590252A (en) | Device for rapidly detecting iron content of iron ore by utilizing D-D neutron generator | |
| CN202256203U (en) | Neutron cement multi-element quick analyzer | |
| Chen et al. | Measurement of the neutron energy spectrum of Back-n# ES1 at CSNS | |
| Kiptily et al. | Fast ion JET diagnostics: confinement and losses | |
| Mulik et al. | Measurement of the neutron capture cross-section of 238U at neutron energies of 5.9±0.5 and 15.5±0.7 MeV by using the neutron activation technique | |
| Sibczynski et al. | Comparison of prompt and delayed photofission neutron detection ttechniques using different types of radiation detectors | |
| CN217133392U (en) | Detection device for special nuclear materials | |
| Yuan et al. | A Real-Time Hard X-Ray Tomographic System Designed for HL-2A Fast Electron Bremsstrahlung Radiation | |
| Baurichter et al. | Search for cold fusion in palladium | |
| Job et al. | An Online Beam Loss Monitor for NSLS-II Storage Ring |
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: 20130320 |