CN101004392A - Dynamic online device for measuring moisture of materiel, and measuring method - Google Patents
Dynamic online device for measuring moisture of materiel, and measuring method Download PDFInfo
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- CN101004392A CN101004392A CNA200710010106XA CN200710010106A CN101004392A CN 101004392 A CN101004392 A CN 101004392A CN A200710010106X A CNA200710010106X A CN A200710010106XA CN 200710010106 A CN200710010106 A CN 200710010106A CN 101004392 A CN101004392 A CN 101004392A
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Abstract
A device used for dynamically measuring water content of material in on-line means is prepared for adding gamma ray ionization chamber detector on said device to make material one point measurement to be cross section measurement on material set on conveying belt for correcting influence of material shape on water content measurement; setting fast and slow neutron generator on the same plane to change transmission mode to be scattering mode to raise flux of slow neutron at detection region for ensuring measurement accuracy of water content. Its measuring method is also disclosed.
Description
Technical field: the present invention relates to the field that a kind of nuclear detection technology and test technique automatic combine, be specifically related to a kind of dynamic online device for measuring moisture of materiel and measuring method.
Background technology: in the mine, various fields such as metallurgy, building materials, coal need carry out moisture on-line and measure to the material that band conveyor is carried, so that realize the automatic adjusting of moisture, finish the automatic control of production run.The Neutron Moisture instrument that is applied at present on the on-the-spot band conveyor all is transmission-type Neutron Moisture instrument usually, and it is to utilize neutron and gamma-rays transmission beam method simultaneous determination density and moisture.This mode generally all is that two radioactive sources and two detectors all are placed on tested material both sides up and down, utilize the slowing down effect of water to fast neutron, the slowing down quantity of measuring fast neutron reflects the water inventory that contains of space exploration material, participates in the calculating of moisture with the mass thickness of scintillator detector reception gamma-ray measurement material.The package unit measuring accuracy is than higher, and is also more intense to the adaptive faculty of on-the-spot material.But also have the following disadvantages situation sometimes: 1. some customer requirements control times are very short, and the distance of detector and neutron follower is far away, the search coverage neutron flux is lower, it is less to survey counting, the sensitivity that causes is lower, and the moisture measurement error that statistic fluctuation is brought is bigger, for the filtering time that reduces the required increase of error longer, increase Measuring Time, can not satisfy the requirement of response fast of these user's needs; 2. there are phenomenons such as sideslip in some belt conveyors, and utilize point-to-point measurement of scintillator detector to reflect and what of material on the belt conveyor participate in the calculating of moisture, act on limited, poor slightly to the adaptability of material shapes variation.
Summary of the invention:
The present invention is directed to the deficiency that present dynamic online device for measuring moisture of materiel and measuring method exist, propose the high apparatus and method of a kind of moisture measurement precision.
Existing online device for measuring moisture is owing to use single gamma-rays scintillator detector, only measure the data of a point of material, can not accurately reflect material total amount and material shapes, and material total amount and material shapes all are related to moisture measurement, thereby the measurement result degree of accuracy is lower.Take the transmission-type mode on the mensuration of moisture, because it measures the inherent characteristics of mode, the search coverage neutron flux is lower, influences measurement result.Adopt point-like gamma-rays scintillator detector, wire gamma ionization chamber detector simultaneous determination to reflect material total amount and material shapes to this present invention, simultaneously the transmission-type neutron is measured moisture and changed into diffuse transmission type slow neutron mensuration moisture.
Concrete scheme of the present invention: a kind of dynamic online device for measuring moisture of materiel and measuring method: comprise fast-neutron generator, slow neutron detector, gamma milker, gamma-rays scintillator detector, main frame and display, it is characterized in that: dynamic online device for measuring moisture of materiel is made up of gamma-rays determinator, neutron determinator and data processing equipment three parts, wherein, the gamma-rays determinator is on fixed support 7 tops gamma milker 6 to be housed, and gamma-rays scintillator detector 8 and gamma ionization chamber detector 9 are housed in the bottom; The neutron determinator is that fast-neutron generator 3 is housed on fixed frame 5, in the fast-neutron generator outside slow neutron detector 4 is housed; Data processing equipment is made up of industrial computer 1 that has intelligent integrated circuit board and display 2; The output line of gamma-rays scintillator detector 8 and gamma ionization chamber detector 9 is connected with industrial computer 1; The output line of slow neutron detector 4 is connected with industrial computer 1; Slow neutron detector is one or two or three or four; The dynamic online moisture measuring method of material is that gamma milker 6 is placed above the belt conveyor 10, gamma-rays scintillator detector 8 and gamma ionization chamber detector 9 place below the belt conveyor 10, fast-neutron generator 3 and slow neutron detector 4 place below the belt conveyor 10, gamma-rays scintillator detector 8 places belt conveyor 10 middle parts, and gamma ionization chamber detector 9 laterally places below the belt conveyor 10.Fast-neutron generator 3 places the middle part of belt conveyor 10.Slow neutron detector 4 is near fast-neutron generators 3, if with a slow neutron detector, slow neutron detector and fast-neutron generator are along the arrangement of belt conveyor traffic direction, and slow neutron detector itself is vertical with belt conveyor; If with two slow neutron detectors, two relative fast-neutron generator symmetries of slow neutron detector are placed, the three arranges along the belt conveyor traffic direction, slow neutron detector itself is vertical with belt conveyor, or three's belt conveyor traffic direction arrangement sidewards, slow neutron detector itself is parallel with belt conveyor; If with three slow neutron detectors, wherein two relative fast-neutron generator symmetries of slow neutron detector are placed, three's belt conveyor traffic direction sidewards arranges, slow neutron detector itself is parallel with belt conveyor, the 3rd slow neutron detector is placed on any end at two ends in addition of fast-neutron generator, and the 3rd slow neutron detector itself is vertical with belt conveyor; If with four slow neutron detectors, four relative fast-neutron generator symmetries of slow neutron detector are placed on fast-neutron generator four ends, in twos respectively along, the belt conveyor traffic direction is arranged sidewards, slow neutron detector itself is vertical with belt conveyor, parallel respectively in twos; When material passes through pick-up unit, the gamma-rays that gamma milker 6 sends sees through material and is received by gamma-rays scintillator detector 8 and gamma ionization chamber detector 9 respectively, the fast neutron that fast-neutron generator 3 sends is received by slow neutron detector 4 after material scattering slowing down, the signal of gamma-rays scintillator detector 8, gamma ionization chamber detector 9 and slow neutron detector 4 is sent into industrial computer 1 and is gathered and handle computing, survey data and computing formula is as follows:
1 pair have, slow neutron and gamma-rays during no material measure, and obtains following data:
N1---absorbed the gamma-ray transmission scintillator counting in back by material
N2---counted by the scattering of slow neutron after the material scattering slowing down
N3---absorbed the gamma-ray transmission chamber counting in back by material
N10---gamma-rays scintillator counting during no material
N20---slow neutron counting during no material
N30---gamma ionization chamber counting during no material
2 are calculated as follows the numerical value of parameter L 1, L2, L3:
L1＝Ln(N10)-Ln(N1) (2)
L2＝N2-N20 (3)
L3＝Ln(N30)-Ln(N3) (4)
3 are calculated as follows the moisture figure H that detects material:
H＝A*L2/L3+B/L3+C/L1+D (1)
A, B, C, D are constant in the formula.
The numerical value of constant A, B, C, D is demarcated according to a conventional method by actual material and is tried to achieve in the following formula.
Beneficial effect of the present invention:
The present invention increases the gamma ionization chamber detector on the gamma-rays determinator, made originally band conveyor middle part material one point measurement was become the whole cross-sectioning of material, more help correcting the influence of material shapes to measurement result, slow neutron detector on the neutron determinator and fast-neutron generator are at grade, become existing transmission-type and be measured as the diffuse transmission type measurement, improve the search coverage slow-neutron flux, improve the accuracy and the sensitivity of determination of moisture; Owing to adopt gamma-rays scintillator detector, gamma ionization chamber detector, three kinds of detector combined measurements of slow neutron detector, can provide and pile up material moisture data message on material density, thickness, shape data information and the belt conveyor on the belt conveyor naturally, reasonably detector is selected for use, layout and corresponding mathematical model can make moisture measurement not be subjected to the influence of material density, thickness, change of shape, improves measuring accuracy.Detect the moisture error less than 0.5%.When factors vary such as the density of material, thickness, shape, still can guarantee measuring accuracy.Utilize detected moisture value to remove to control production equipment, realize the automatic adjusting of material moisture in the production run, can guarantee product quality, enhance productivity, bring remarkable economic efficiency to the user.
Whole sniffer topology layout is reasonable, make to install, easy to maintenance and increased detection efficiency, has improved measurement moisture precision and sensitivity.
The present invention can be used for the material that various fields such as mine, metallurgy, building materials, coal carry band conveyor and carries out on-line measurement, so that realize the automatic adjusting of moisture, finishes the automatic control of production run.
Description of drawings
Fig. 1, dynamic online device for measuring moisture of materiel structural representation of the present invention
Detector arrangement synoptic diagram in Fig. 2, the embodiment of the invention 1
Detector arrangement synoptic diagram in Fig. 3, the embodiment of the invention 2
In Fig. 4, the embodiment of the invention 3 among the detector arrangement synoptic diagram figure: 1 main frame, 2 displays, 3 fast-neutron generators, 4 slow neutron detectors, 5 fixed frames, 6 gamma milkers, 7 fixed supports, 8 gamma-rays scintillator detectors, 9 gamma ionization chamber detectors, 10 belt conveyors
Embodiment
Embodiment 1 closes description of drawings dynamic online device for measuring moisture of materiel of the present invention and measuring method: the centre position is equipped with fixed frame 5 below belt conveyor 10, fast-neutron generator 3 is housed on fixed frame 5, present embodiment fast-neutron generator 3 adopts the Am-Be neutron source of band reflecting body, and activity is 1.1 * 10
10Bq is equipped with four slow neutron detectors 4 on fast-neutron generator 3 outside fixed frames 5, slow neutron detector 4 and fast-neutron generator 3 are as far as possible near belt conveyor 10 bottom surfaces.See Fig. 2, slow neutron detector is
3He proportional counter tube (model: DFB-1400); On fixed support 7 tops gamma milker 6 is housed, is equipped with in the ray generator
137Cs radiographic source, activity are 1.5 * 10
9Bq, gamma milker 6 places above the belt conveyor 10, with material at a distance of 75cm, gamma-rays scintillator detector 8 (model: DFB-1104) with gamma ionization chamber detector 9 (model: DFB-1007 east observation and control technology company limited produces) is housed in fixed support 7 bottoms, gamma-rays scintillator detector 8 places belt conveyor 10 following centre positions, gamma ionization chamber detector 9 laterally places below the belt conveyor 10,6 one-tenth fan-shaped irradiations of gamma milker, gamma-rays covers gamma-rays scintillator detector 8 and gamma ionization chamber detector 9 regions, slow neutron detector 4, gamma-rays scintillator detector 8, the output line of gamma ionization chamber detector 9 connects main frame 1, and display 2 and main frame 1 are connected with signal wire.
Demarcate with standard specimen, totally 20 groups, change of soil water content is between 4% to 8%, and variation in thickness wherein has 8 groups of standard specimen people material width for a change greater than 12 centimetres, and the data that detected are sent into main frame and handled, and the gained result is as follows by analysis:
The formula coefficient of instrument:
A＝0.0122
B＝3.02
C＝5.65
D＝-14.08
Measure material moisture absolute error mean value: 0.155%
Response cycle (the moisture error that statistic fluctuation brings reaches the filtering time that control requires required increase): 6 seconds
Embodiment 2 slow neutron detectors are two, and two relative fast-neutron generator symmetries of slow neutron detector are placed, and the three arranges along the belt conveyor traffic direction, sees Fig. 3, and other is with embodiment 1, and it is as follows to analyze the gained result:
The formula coefficient of instrument:
A＝0.0206
B＝3.03
C＝5.61
D＝-14.05
Measure material moisture absolute error mean value: 0.163%
Response cycle: 12 seconds
The formula coefficient of instrument:
A＝0.0412
B＝3.18
C＝5.42
D＝-14.06
Measure material moisture absolute error mean value: 0.173%
Response cycle: 20 seconds
Claims (3)
1 one kinds of dynamic online device for measuring moisture of materiel and measuring method: comprise fast-neutron generator, slow neutron detector, gamma milker, gamma-rays scintillator detector, main frame and display, it is characterized in that: dynamic online device for measuring moisture of materiel is made up of gamma-rays determinator, neutron determinator and data processing equipment three parts, wherein, the gamma-rays determinator is on fixed support (7) top gamma milker (6) to be housed, and gamma-rays scintillator detector (8) and gamma ionization chamber detector (9) are housed in the bottom; The neutron determinator is that fast-neutron generator (3) is housed on fixed frame (5), in the fast-neutron generator outside slow neutron detector (4) is housed; Data processing equipment is made up of industrial computer that has intelligent integrated circuit board (1) and display (2); The output line of gamma-rays scintillator detector (8) and gamma ionization chamber detector (9) is connected with industrial computer (1); The output line of slow neutron detector (4) is connected with industrial computer (1).
2 by claim 1 dynamic online device for measuring moisture of materiel and measuring method, and said slow neutron detector is characterized in that: slow neutron detector is one or two or three or four.
3 by claim 1 dynamic online device for measuring moisture of materiel and measuring method, the dynamic online moisture measuring method of said material is characterized in that: be that gamma milker (6) is placed above the belt conveyor (10), gamma-rays scintillator detector (8) and gamma ionization chamber detector (9) place below the belt conveyor (10), fast-neutron generator (3) and slow neutron detector (4) place below the belt conveyor (10), gamma-rays scintillator detector (8) places belt conveyor (10) middle part, gamma ionization chamber detector (9) laterally places below the belt conveyor (10), fast-neutron generator (3) places the middle part of belt conveyor (10), if with a slow neutron detector, slow neutron detector and fast-neutron generator are arranged along the belt conveyor traffic direction, and slow neutron detector itself is vertical with belt conveyor; If with two slow neutron detectors, two relative fast-neutron generator symmetries of slow neutron detector are placed, the three arranges along the belt conveyor traffic direction, slow neutron detector itself is vertical with belt conveyor, or three's belt conveyor traffic direction arrangement sidewards, slow neutron detector itself is parallel with belt conveyor; If with three slow neutron detectors, wherein two relative fast-neutron generator symmetries of slow neutron detector are placed, three's belt conveyor traffic direction sidewards arranges, slow neutron detector itself is parallel with belt conveyor, the 3rd slow neutron detector is placed on any end at two ends in addition of fast-neutron generator, and the 3rd slow neutron detector itself is vertical with belt conveyor; If with four slow neutron detectors, four relative fast-neutron generator symmetries of slow neutron detector are placed on fast-neutron generator four ends, in twos respectively along, the belt conveyor traffic direction is arranged sidewards, slow neutron detector itself is vertical with belt conveyor, parallel respectively in twos; When material passes through pick-up unit, the gamma-rays that gamma milker (6) sends sees through material and is received by gamma-rays scintillator detector (8) and gamma ionization chamber detector (9) respectively, the fast neutron that fast-neutron generator (3) sends is received by slow neutron detector (4) after material scattering slowing down, the signal of gamma-rays scintillator detector (8), gamma ionization chamber detector (9) and slow neutron detector (4) is sent into industrial computer (1) and is gathered and handle computing, survey data and computing formula is as follows:
1 pair have, slow neutron and gamma-rays during no material measure, and obtains following data:
N1---absorbed the gamma-ray transmission scintillator counting in back by material
N2---counted by the scattering of slow neutron after the material scattering slowing down
N3---absorbed the gamma-ray transmission chamber counting in back by material
N10---gamma-rays scintillator counting during no material
N20---slow neutron counting during no material
N30---gamma ionization chamber counting during no material
2 are calculated as follows the numerical value of parameter L 1, L2, L3:
L1＝Ln(N10)-Ln(N1) (2)
L2＝N2-N20 (3)
L3＝Ln(N30)-Ln(N3) (4)
3 are calculated as follows the moisture figure H that detects material:
H＝A*L2/L3+B/L3+C/L1+D (1)
A, B, C, D are constant in the formula.
The numerical value of constant A, B, C, D is demarcated according to a conventional method by actual material and is tried to achieve in the following formula.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA200710010106XA CN101004392A (en) | 2007-01-19 | 2007-01-19 | Dynamic online device for measuring moisture of materiel, and measuring method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA200710010106XA CN101004392A (en) | 2007-01-19 | 2007-01-19 | Dynamic online device for measuring moisture of materiel, and measuring method |
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| CN101004392A true CN101004392A (en) | 2007-07-25 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102590250A (en) * | 2012-01-18 | 2012-07-18 | 中国人民解放军第二炮兵装备研究院第六研究所 | Method for measuring oxidation percentage of metal plutonium |
| CN110286137A (en) * | 2019-07-24 | 2019-09-27 | 水利部交通运输部国家能源局南京水利科学研究院 | A kind of equivalent NEUTRON METHOD detection device of coming to nothing in steel-shelled concrete interface |
| WO2019241830A1 (en) * | 2018-06-21 | 2019-12-26 | Chrysos Corporation Limited | System and method for moisture measurement |
-
2007
- 2007-01-19 CN CNA200710010106XA patent/CN101004392A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102590250A (en) * | 2012-01-18 | 2012-07-18 | 中国人民解放军第二炮兵装备研究院第六研究所 | Method for measuring oxidation percentage of metal plutonium |
| CN102590250B (en) * | 2012-01-18 | 2013-06-26 | 中国人民解放军第二炮兵装备研究院第六研究所 | Method for measuring oxidation percentage of metal plutonium |
| WO2019241830A1 (en) * | 2018-06-21 | 2019-12-26 | Chrysos Corporation Limited | System and method for moisture measurement |
| CN112313504A (en) * | 2018-06-21 | 2021-02-02 | 澳洲快索有限公司 | System and method for humidity measurement |
| CN112313504B (en) * | 2018-06-21 | 2024-04-26 | 澳洲快索有限公司 | System and method for humidity measurement |
| CN110286137A (en) * | 2019-07-24 | 2019-09-27 | 水利部交通运输部国家能源局南京水利科学研究院 | A kind of equivalent NEUTRON METHOD detection device of coming to nothing in steel-shelled concrete interface |
| CN110286137B (en) * | 2019-07-24 | 2022-04-08 | 水利部交通运输部国家能源局南京水利科学研究院 | Steel shell concrete interface equivalent void neutron method detection device |
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Open date: 20070725 |