CN101349658B - Fast analysis method of coal ash separating line - Google Patents
Fast analysis method of coal ash separating line Download PDFInfo
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- CN101349658B CN101349658B CN2008100132293A CN200810013229A CN101349658B CN 101349658 B CN101349658 B CN 101349658B CN 2008100132293 A CN2008100132293 A CN 2008100132293A CN 200810013229 A CN200810013229 A CN 200810013229A CN 101349658 B CN101349658 B CN 101349658B
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- 239000010883 coal ash Substances 0.000 title claims abstract description 4
- 238000004458 analytical method Methods 0.000 title claims description 8
- 239000003245 coal Substances 0.000 claims abstract description 60
- 239000002956 ash Substances 0.000 claims abstract description 23
- 230000002285 radioactive effect Effects 0.000 claims abstract description 18
- 238000000034 method Methods 0.000 claims abstract description 15
- 230000005251 gamma ray Effects 0.000 claims description 18
- 238000001514 detection method Methods 0.000 claims description 6
- 238000012417 linear regression Methods 0.000 claims description 3
- 238000013519 translation Methods 0.000 claims description 3
- 238000005070 sampling Methods 0.000 claims description 2
- 238000005259 measurement Methods 0.000 abstract description 8
- LXQXZNRPTYVCNG-YPZZEJLDSA-N americium-241 Chemical compound [241Am] LXQXZNRPTYVCNG-YPZZEJLDSA-N 0.000 abstract description 5
- 238000012545 processing Methods 0.000 abstract description 5
- 238000000926 separation method Methods 0.000 abstract 1
- 230000005540 biological transmission Effects 0.000 description 6
- 239000013078 crystal Substances 0.000 description 6
- 239000000463 material Substances 0.000 description 4
- 238000007639 printing Methods 0.000 description 4
- TVFDJXOCXUVLDH-RNFDNDRNSA-N cesium-137 Chemical compound [137Cs] TVFDJXOCXUVLDH-RNFDNDRNSA-N 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 230000005855 radiation Effects 0.000 description 3
- 238000005303 weighing Methods 0.000 description 3
- 238000010521 absorption reaction Methods 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- 230000008676 import Effects 0.000 description 2
- 230000003068 static effect Effects 0.000 description 2
- 239000004411 aluminium Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000001186 cumulative effect Effects 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000004973 liquid crystal related substance Substances 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 230000000644 propagated effect Effects 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000004580 weight loss Effects 0.000 description 1
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- Analysing Materials By The Use Of Radiation (AREA)
Abstract
The invention relates to a method for rapidly analyzing coal ash separation lines, which comprises adopting a sensitive pressure sensor to directly weigh the total amount of coal samples, enabling the thicknesses of coal samples to satisfy the optimum measurement thickness of isotope radioactive source americium-241, guaranteeing the high-precision measurement, and rapidly and directly reading out results after processing, and then preserving the results, the structure is simple, and the operation is simple. The method is suitable for the occasions which need to rapidly and accurately analyze ash in coal, and can be applied in places such as thermal power plants, ports and the like which need to analyze ash in coal to an ore bin and a stockpile.
Description
Technical field
The present invention relates to a kind of ash content detection method, relate to a kind of method of measuring ash content of coal with gamma-rays in conjunction with electronic-weighing specifically.
Background technology
The method of off-line type Measurement and analysis ash content of coal, what also the most generally use the earliest is burning check weighing method, promptly gets constant weight g earlier
1Coal sample, then according to the working specification of standard burning coal sample, weigh the weight g of final remaining ashy substance at last
2, just can calculate ash value H according to following formula:
H＝g
2/g
1×100％
But this method operating process is loaded down with trivial details, needs the time longer, generally just can obtain analysis result after 40～50 minutes.
In order to obtain the ash value of coal sample fast, a kind of pick-up unit that utilizes material the gamma-rays absorbing rule to be measured static coal sample ash content is arranged now, this device adopts two-photon source (americium-241, caesium-137) emits the gamma-rays of two groups of different-energies, because coal is different to two groups of gamma-ray absorption efficiencies with ash content, when instrument record does not have material and the gamma intensity when material is arranged, and convert thereof into electric signal, computing machine can calculate ash content of coal content according to the variation of these data.This analysis mode can shorten to Measuring Time about 3～5 minutes.
But because the gamma-ray penetration capacity of two groups of different-energies differs greatly, if cause coal sample thickness to satisfy effective transmission of the low-energy of americium-241, the gamma-ray intensity of middle energy that then can't make caesium-137 has enough obvious variation in that transmission is forward and backward, causes measuring accuracy not high.And if the gamma-ray intensity of middle energy that guarantees caesium-137 has enough obvious variation in that transmission is forward and backward, just must increase the thickness of coal sample, but so, can be with the low-energy hyperabsorption of americium-241, low-energy intensity after the transmission that detects is low excessively, be subjected to the influence of background and fluctuation effect excessive, cause bigger measuring error.And, then need to prolong Measuring Time to reduce the influence of fluctuation effect in order to guarantee accuracy of detection, Measuring Time can't be tapered to minimum.
Summary of the invention
At the defective that aforementioned detection method exists, propose a kind ofly directly to measure coal sample the method that static coal sample ash content is carried out express-analysis with gamma-rays and pressure transducer.
The concrete technical scheme that the present invention adopts is:
1) sampling: coal sample is deposited in the fixing sample box of volume size naturally, wipes off along the sample box upper edge with scraper plate;
2) pick-up unit: under fixed support, be provided with isotope radioactive source device, in the fixed support middle level pressure transducer is housed, the pressure sensor signal output terminal connects main frame, on pressure transducer, be equipped with pallet, be provided with gamma ray detector on fixed support, the signal output part of gamma ray detector connects main frame;
3) detect and calculate: during detection, sample box is placed on the pallet, start radioactive source, gamma ray detector, pressure transducer main frame; After the gamma-rays that radioactive source sends penetrates coal sample, be detected device and receive, detector changes the gamma-rays that measures into pulse signal, is transferred in the main frame; Pressure transducer changes the pressure that is subjected to into voltage signal, changes voltage signal into pulse signal by the voltage/frequency translation circuit again; Main frame calculates the ash value H of coal sample according to the two-way counting rate of the big or small and gamma intensity of corresponding pressure pressure that sensor bears respectively in the signal that receives according to following formula:
H＝A·(lnN
20—lnN
2)/(N
1—N
10)+B·(N
1—N
10)+C
N wherein
10Counting rate for the corresponding pressure that measures during no coal sample in the sample box;
N
1The counting rate of the corresponding pressure that measures when in the sample box coal sample being arranged;
N
20Be the corresponding gamma-ray counting rate that measures during no coal sample in the sample box;
N
2The corresponding gamma-ray counting rate that measures when in the sample box coal sample being arranged;
A, B, C then are undetermined coefficient, and this undetermined coefficient is measured by the coal sample to known ash content, carry out linear regression with least square method then and try to achieve.
Characteristics of the present invention are to adopt the total amount of the direct weighing coal sample of sensitive pressure transducer, make that the thickness of coal sample can be the thickness that satisfies isotope radioactive source americium-241 optimum measurement, guarantee high-acruracy survey, and simple in structure, easy and simple to handle, can directly read the result rapidly after the processing and the result is preserved.
The present invention is applicable to the occasion that need quick and precisely analyze ash content to coal, can be used for the place that ash analysis need be carried out to ore storage bin, stockpile coal in cogeneration plant, harbour etc.
Description of drawings
Fig. 1 is in the embodiment among the pick-up unit mounting structure synoptic diagram figure: 1 fixed support, 2 shielding followers, 3 radioactive sources, 4 collimating apertures, 5 sample boxs, 6 pallets, 7 pressure transducers, 8 detectors, 9 main frames, 10 scintillation crystals, 11 photomultipliers, 12 circuit boards.
Embodiment
Specify detection method of the present invention in conjunction with the accompanying drawings.
Shielding follower 2 is installed in the lower floor of support 1, in the shielding follower 2 radioactive source 3 is housed, and radioactive source 3 is
241The Am isotope source.For radioactive source is protected, use the ray of 2 pairs of radioactive source institutes of shielding follower radiation to carry out shielding protection, shielding follower 2 has conical collimating aperture 4, the gamma-rays that makes radioactive source 3 send can only be propagated in the space that collimating aperture 4 is fettered, and when x ray irradiation x arrived sample box 5 bottoms, irradiated area just conformed to coal sample.
Pressure transducer 7 is fixed on the middle level of support 1, on pressure transducer 7, pallet 6 is housed, and the centre of pallet 6 has a circular port, and the diameter in hole conforms to the interior diameter of sample box 5; And being processed with platform on the circular port limit, the width of edge of table conforms to the wall thickness of sample box 5.
Detector 8 is fixed on the upper strata of support 1.Detector 8 is conventional scintillator detector, and its inside is equipped with scintillation crystal 10, photomultiplier 11, circuit board 12 from the bottom to top successively, and the diameter of scintillation crystal 10 conforms to the interior diameter of sample box 5.
The installation of whole table apparatus guarantees that the axis of scintillation crystal 10, the center and the radioactive source 3 of pallet 6 middle circular ports are on same the vertical vertical line.
When sample box 5 is placed on the pallet 6, just can be stuck in the circular port edge of table of pallet 6.And the radiation gamma that radioactive source 3 gives off along collimating aperture 4 is during to sample box 5, and ray just passes the circular port of pallet 6, and coverage rate is circular, and its center of circle and diameter conform to the center of circle and the internal diameter of sample box 5 respectively.Sample box 5 is the round barrel shape of aluminium matter, can take away from pallet 6.
During use, in sample box 5, pile up coal sample naturally, wipe off along sample box 5 upper edges with scraper plate then, make the cumulative volume of coal sample just equal the volume of sample box 5.Then sample box 5 is positioned on the pallet 6 in the lump together with coal sample.
Pressure transducer 7 can change the pressure that is subjected to into voltage signal, and the volt value of voltage is directly proportional with the size of suffered pressure.After voltage signal is sent to main frame 9, change voltage signal into pulse signal by the voltage/frequency translation circuit, the volt value relation in direct ratio of the frequency of pulse signal and voltage wherein, main frame 9 is by counter records pulse digit rate.
The radiation gamma that radioactive source 3 sends is after coal sample, and a part interacts with coal sample, and some penetrates coal sample and is detected device 8 and receives.And ray penetrates the forward and backward intensity of coal sample, meets material to gamma-ray absorbing rule:
I＝I
0·e
(-μ·d)
Wherein I is the transmitted intensity after the transmission, I
0Be the transmitted intensity before the transmission, μ be coal sample to gamma-ray absorption coefficient, d is the mass thickness of coal sample.And the numerical value of μ is relevant with the ash content of coal sample, and d is relevant with the density of coal sample.
The gamma-rays that detector 8 just measures changes pulse signal into, is transferred to main frame 9.
Instrument main frame 9 according to the sensor of corresponding pressure respectively 7 that receives the pressure that bears size and detector 8 receive the two-way counting rate of gamma intensity, calculate the ash value H of coal sample according to following formula:
H＝A·(lnN
20—lnN
2)/(N
1—N
10)+B·(N
1—N
10)+C
N wherein
10Be the counting rate of the corresponding pressure that measures during no coal sample in the sample box, N
1The counting rate of the corresponding pressure that measures when in the sample box coal sample being arranged, N
20Be the corresponding gamma-ray counting rate that measures during no coal sample in the sample box, N
2The corresponding gamma-ray counting rate that measures when in the sample box coal sample being arranged; A, B, C then are undetermined coefficient, can measure by the coal sample to known ash content, carry out linear regression with least square method then and try to achieve.
Main frame by pulse signal shaping circuit, signal interface circuit, CPLD logic processing circuit, 32 ARM7 kernel embedded control system circuit, power circuit, PC104 industrial control board circuit, touch industrial LCDs etc. and form, realize the menu Chinese character window operation.Main frame obtains signal, carries out data processing, obtains the coal sample ash value; Can manually import coal sample number, title, preserve jointly with measurement result; Can inquire about or external printing device history of printing record.
Application example
Sample box adopts aluminum, is round barrel shape, is down arranged the end, goes up uncovered.Its internal volume is Φ 10 * 5cm.Wall thickness is 3mm, and the thickness of going to the bottom is 1mm.
Radioactive source is
241Am isotope source, activity are 1.85 * 10
9Bq.
Detector is a scintillator detector, and scintillation crystal is selected NaI (T1) crystal for use, and crystalline size is Φ 10 * 2cm.
Main frame adopts power PC 104 industrial control boards, and wide temperature color liquid crystal touch display screen is realized the menu Chinese character window operation.Main frame obtains signal, carries out data processing, obtains the coal sample ash value; Can manually import coal sample number, title, preserve jointly with measurement result; Can inquire about or external printing device history of printing record.
By to one group of known coal sample calibration measurements according to a conventional method, it is as follows to obtain relevant parameters:
A＝18.7821 B＝0.8372 C＝-33.3466
Utilize this method that coal sample is carried out ash content and measure, Measuring Time is 1 minute, and measurement result and burning weight loss method obtain result's contrast, and square error is less than 0.5%.
Claims (1)
1. method to the coal ash separating line express-analysis is characterized in that:
1) sampling: coal sample is deposited in the fixing sample box of volume size naturally, wipes off along the sample box upper edge with scraper plate;
2) pick-up unit: under fixed support, be provided with isotope radioactive source device, in the fixed support middle level pressure transducer is housed, the pressure sensor signal output terminal connects main frame, on pressure transducer, be equipped with pallet, be provided with gamma ray detector on fixed support, the signal output part of gamma ray detector connects main frame;
3) detect and calculate: during detection, sample box is placed on the pallet, start radioactive source, gamma ray detector, pressure transducer, main frame; After the gamma-rays that radioactive source sends penetrates coal sample, be detected device and receive, detector changes the gamma-rays that measures into first pulse signal, is transferred in the main frame; Pressure transducer changes the pressure that is subjected to into voltage signal, after voltage signal is transferred to main frame, changes voltage signal into second pulse signal by the voltage/frequency translation circuit; Main frame calculates the ash value H of coal sample according to the two-way counting rate of the big or small and gamma intensity of corresponding pressure pressure that sensor bears respectively in the signal that receives according to following formula:
H＝A·(ln?N
20-lnN
2)/(N
1-N
10)+B·(N
1-N
10)+C
N wherein
10Counting rate for the corresponding pressure that measures during no coal sample in the sample box;
N
1The counting rate of the corresponding pressure that measures when in the sample box coal sample being arranged;
N
20Be the corresponding gamma-ray counting rate that measures during no coal sample in the sample box;
N
2The corresponding gamma-ray counting rate that measures when in the sample box coal sample being arranged;
A, B, C then are undetermined coefficient, and this undetermined coefficient is measured by the coal sample to known ash content, and least square method is carried out linear regression and tried to achieve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008100132293A CN101349658B (en) | 2008-09-17 | 2008-09-17 | Fast analysis method of coal ash separating line |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008100132293A CN101349658B (en) | 2008-09-17 | 2008-09-17 | Fast analysis method of coal ash separating line |
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| Publication Number | Publication Date |
|---|---|
| CN101349658A CN101349658A (en) | 2009-01-21 |
| CN101349658B true CN101349658B (en) | 2010-11-03 |
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|---|---|---|---|
| CN2008100132293A Expired - Fee Related CN101349658B (en) | 2008-09-17 | 2008-09-17 | Fast analysis method of coal ash separating line |
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Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101532967B (en) * | 2009-04-13 | 2012-07-18 | 天地科技股份有限公司 | Device for detecting ash content at coal bypass on line and method thereof |
| CN101551460B (en) * | 2009-05-13 | 2011-10-26 | 北京市煤炭矿用机电设备技术开发公司 | Explosion proof gamma-ray detector and mining coal ash analyzer |
| CN103649734A (en) * | 2010-09-30 | 2014-03-19 | 上海英迈吉东影图像设备有限公司 | Point-by-point scanning device and method uesd in X ray imaging |
| CN102269718B (en) * | 2011-06-16 | 2013-02-13 | 邸生才 | X-ray ash content measurement device and method |
| CN102749344B (en) * | 2012-06-19 | 2016-03-16 | 内蒙古立信测控技术有限公司 | A kind of coal ash detection method based on single radioactive source |
| CN103173558B (en) * | 2013-03-26 | 2015-02-25 | 四川川娇生态猪业股份有限公司 | Identification or prediction method of pork quality |
| CN104198503B (en) * | 2014-08-19 | 2017-01-25 | 开封市测控技术有限公司 | Online coal ash content measurement system and method based on natural gamma rays |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4090074A (en) * | 1975-10-29 | 1978-05-16 | Australian Atomic Energy Commission | Analysis of coal |
| GB2073884A (en) * | 1980-04-10 | 1981-10-21 | Atomic Energy Of Australia | Analysis of coal |
| US4884288A (en) * | 1985-12-31 | 1989-11-28 | Commonwealth Scientific And Industrial Research Organization | Neutron and gamma-ray moisture assay |
| CN2383071Y (en) * | 1999-07-21 | 2000-06-14 | 河南豫联能源集团有限责任公司 | Special probe for ash content measurer |
-
2008
- 2008-09-17 CN CN2008100132293A patent/CN101349658B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4090074A (en) * | 1975-10-29 | 1978-05-16 | Australian Atomic Energy Commission | Analysis of coal |
| GB2073884A (en) * | 1980-04-10 | 1981-10-21 | Atomic Energy Of Australia | Analysis of coal |
| US4884288A (en) * | 1985-12-31 | 1989-11-28 | Commonwealth Scientific And Industrial Research Organization | Neutron and gamma-ray moisture assay |
| CN2383071Y (en) * | 1999-07-21 | 2000-06-14 | 河南豫联能源集团有限责任公司 | Special probe for ash content measurer |
Non-Patent Citations (1)
| Title |
|---|
| JP平2-226056A 1990.09.07 |
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Granted publication date: 20101103 Termination date: 20130917 |