CN101349661B - Method for on-line detecting coal ashes on belt - Google Patents
Method for on-line detecting coal ashes on belt Download PDFInfo
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- CN101349661B CN101349661B CN2008100132240A CN200810013224A CN101349661B CN 101349661 B CN101349661 B CN 101349661B CN 2008100132240 A CN2008100132240 A CN 2008100132240A CN 200810013224 A CN200810013224 A CN 200810013224A CN 101349661 B CN101349661 B CN 101349661B
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Abstract
The invention relates to a method for detecting ash content of coal on a belt on line, wherein a radioactive source is mounted between a lower belt and an upper belt, a detector is arranged above the upper belt and coal, transmission photon and annihilation radiation photon which are received by the detector are conversed into electric pulsed signals to transmit to an intelligent host machine, and ash content value H of coal is calculated out according to transmission photon count N1 and annihilation radiation photon count N2 and H=A.K2+B.K+C.(lnN10-lnN1)+D. Since the radioactive source and the detector are respectively mounted on the upper side and the lower side of testing factors which are coal, and then the portions near the radioactive source and the detector in cola are avoided from being interacted with an incident ray, which are on a bigger weight in measuring, and therefore, when the distribution of ash content of coal is not even, the testing results and the real ash content value of the integral coal can be led to have the shortcoming of bigger gaps, and the testing results are led to be more accurate. The detecting device which is adopted by the method has simple structure and convenient installation and employment.
Description
Technical field
The present invention relates to a kind of method of online detection ash content of coal, relate to a kind of method of utilizing gamma-rays fast on-line analyzing ash content of coal specifically.
Background technology
The instrument of present online detection coal ashes on belt, most widely used is exactly dual energy gamma-rays transmission absorption method.Its implementation is to adopt two isotope radioactive sources
241Am and
137The low energy that Cs sends respectively and middle can radiation gamma coal on the belt, then at the opposite side of belt, receive the ray behind the transmission coal.Because the different material in the coal is right to the heavy metal element in the absorption efficiency difference, particularly coal of the ray of these two kinds of energy
241Therefore the absorption efficiency of the low-energy that Am sends will can just can be analyzed and obtain the ash value of coal according to comparing two kinds of Strength Changes that transmission of radiation coal is forward and backward much larger than other element in the coal.
But this instrument can only be applicable on the belt that the coal thickness of feed layer is moderate and change under the little condition, because when coal is more on the belt,
241The low-energy that Am sent can penetrate coal and to be detected the photon numbers that device receives less, approaches the background degree, is subjected to the influence of background and fluctuation effect bigger, brings than mistake to measurement; And when if coal is less on the belt, right
137The barrier effectiveness of the energetic gamma rays that Cs sent is not enough, and it is not obvious to cause ray to penetrate the forward and backward Strength Changes of coal, influences measuring accuracy.
And document introduction, the favourable online ash content of coal analysis meter that combines with pair effect and compton effect,scattering are arranged abroad.Its implementation is the same side that radioactive source and detector is positioned over coal, and the energy that radioactive source sends is higher than the radiation gamma of 1.022MeV behind coal, interacts with coal.Part gamma-rays generation compton effect,scattering produce scattered photon, and its efficient becomes certain relation with the total body density of coal; Part gamma-rays generation pair effect finally produces annihilation radiation photon, and the heavy metal element in the coal probability of this effect takes place will be much larger than other element in the coal.Therefore the scattered photon that can receive by comparator probe and the quantity of annihilation radiation photon just can be extrapolated the ash value of coal.
But because the metering system of this instrument, cause in the coal interaction that taken place near radioactive source and detector part on one side and incident ray, in measurement, be in bigger weight, therefore when the ash content of coal is pockety, will make measurement result not possess representativeness, bigger gap be arranged with the true ash value of whole coal.
Can also utilize the neutron activation method to come that coal on the belt is carried out online ash content in addition and detect, but complex structure involves great expense, being used for measuring ash content of coal does not merely have Practical significance.
Summary of the invention
At the defective that present online ash content of coal measuring method exists, the present invention proposes the online ash content of coal measuring method that a kind of measurement result is accurate, measurement mechanism is simple in structure, easy to operate.
Addressing the above problem concrete technical scheme of the present invention is: a kind of method of online detection coal ashes on belt:
1) installation of pick-up unit: the position between following belt (1) and last belt (2), shielding follower (4) is installed, in shielding follower (4), radioactive source (5) is installed, shielding follower (4) has collimating aperture (6) up, top at last belt (2) and coal (3) is equipped with detector (7), and detector (7) links with smart host (8);
2) testing result is calculated: behind the radiation exposure coal that radioactive source sends, a part is blocked, and some then passes coal and is detected device and receives.And the forward and backward Strength Changes of gamma-rays transmission coal 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 is the gamma ray absorption coefficient of coal to this energy, and d is the mass thickness of coal.
When energy is higher than the radiation gamma of 1.022MeV behind coal, pair effect can take place in a part, produce a pair of positive and negative electronics, and positron is very unstable, meeting and a negatron collision produce annihilation radiation, generate two γ photons that energy is 511KeV, and the probability of the pair effect that ash element takes place in the coal is higher than other element in the coal far away, therefore the intensity of the annihilation radiation photon that is produced is relevant with total ash element content.
Detector is converted to electric impulse signal with the transmission photon that receives and annihilation radiation photon and is transferred to smart host, and smart host can calculate the ash value H of coal according to transmission photon counting N1 that obtains and annihilation radiation photon counting N2 according to following formula:
H＝A·K
2+B·K+C·(ln?N1
0-lnN1)+D
In the formula: K=(10 * N2/N1); N1
0The transmission photon counting that detector measurement arrives when not having coal on the belt can obtain by actual measurement before instrument is used; A, B, C, D are undetermined coefficient, can utilize linear regression processing to obtain according to measurement result by the coal of known ash score value is measured.
Beneficial effect of the present invention: because the radioactive source of pick-up unit of the present invention and the upper and lower both sides that detector is installed in detected material coal respectively, avoided like this because the interaction that is taken place near radioactive source and detector part on one side and incident ray in the coal, in measurement, be in bigger weight, therefore when the ash content of coal is pockety, will make measurement result not possess representativeness, with the true ash value of whole coal the defective of gap is greatly arranged, make measurement result more accurate.
Pick-up unit of the present invention is simple in structure, easy to install.
Description of drawings
Fig. 1 is a pick-up unit installation site structural representation
Among the figure: 1 time belt, belt on 2,3 coals, 4 shielding followers, 5 radioactive sources, 6 collimating apertures, 7 detectors, 8 smart hosts.
Embodiment
Specify method of the present invention in conjunction with the accompanying drawings.
1) installation of pick-up unit: the position between following belt 1 and last belt 2, shielding follower 4 is installed, in shielding follower 4, radioactive source 5 is installed, shielding follower 4 has collimating aperture 6 up, the ray that makes radioactive source 5 be sent can only upwards shine, and interacts with coal 3 above the last belt 2.Above last belt 2 and coal 3 detector 7 is installed, detector 7 links with smart host 8.
2) calculating of testing result: behind the radiation exposure coal 3 that radioactive source 5 sends, a part is blocked, and some then passes coal and is detected device 7 and receives.And the forward and backward Strength Changes of gamma-rays transmission coal 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 is the gamma ray absorption coefficient of coal to this energy, and d is the mass thickness of coal.
When energy is higher than the radiation gamma of 1.022MeV behind coal, pair effect can take place in a part, produce a pair of positive and negative electronics, and positron is very unstable, meeting and a negatron collision produce annihilation radiation, generate two γ photons that energy is 511KeV, and the probability of the ash element generation pair effect in the coal is higher than other element in the coal far away, therefore the intensity of the annihilation radiation photon that is produced is relevant with total ash element content.
H＝A·K
2+B·K+C·(lnN1
0-lnN1)+D
In the formula: K=(10 * N2/N1); N1
0The transmission photon counting that detector measurement arrives when not having coal on the belt can obtain by actual measurement before instrument is used; A, B, C, D are undetermined coefficient, can utilize linear regression processing to obtain according to measurement result by the coal of known ash score value is measured.
Application example
Radioactive source and gamma ray detector are positioned over the both sides of belt and coal respectively.The energy of that radioactive source sent is higher than 1.022MeV, and detector is the scintillator detector with high energy resolution and detection efficiency.
It is 3.7 * 10 that radioactive source is selected activity for use
9Bq's
226The Ra isotope source.
The detector preferred dimension is NaI (Tl) crystal of Φ 100 * 100mm.
Smart host adopts power PC 104 industrial control boards, wide temperature color liquid crystal touch display screen, menu Chinese character window operation.Main frame obtains signal, carries out data processing, obtains the ash content of coal value.Can show various parameters and measurement result, analysis result is handled, export the control signal relevant with the product place value; The performance graph that can show measurement result; Printable various parameter and data; Whenever one group of measurement data of storage in whole 10 minutes can be inquired about and arbitrary day historical record of external printing device printing.
Utilize this method, the coal sample of different-thickness and different grey distribution ratios is carried out calibration measurements, it is as follows to obtain relevant parameters:
A＝-1.4733?B＝12.732?C＝-0.13743?D＝13.413
Utilize calibrated instrument, the coal sample of proportioning is measured, and the measurement result of method is compared with dual intensity γ method, back-scattered electron.The compound method of coal sample is, adopt carbon dust and iron powder, aluminium powder to make ash value and be respectively 12.30 coal sample 1 and the coal samples 2 identical with two kinds of density of 25.61, evenly put the thick coal sample of 15cm 1 earlier on the belt upper berth, spread the coal sample 2 of putting different-thickness then successively thereon, the thickness recruitment of each coal sample 2 is 2cm.Correlation data is as follows:
Claims (1)
1. the method for an online detection coal ashes on belt is characterized in that:
1) installation of pick-up unit: the position between following belt (1) and last belt (2), shielding follower (4) is installed, in shielding follower (4), radioactive source (5) is installed, shielding follower (4) has collimating aperture (6) up, top at last belt (2) and coal (3) is equipped with detector (7), and detector (7) links with smart host (8);
2) testing result is calculated: after energy that radioactive source sends is higher than the radiation gamma coal of 1.022MeV, a part is blocked, some then passes coal, receive and be detected device, detector is converted to electric impulse signal with the transmission photon that receives and annihilation radiation photon and is transferred to smart host, smart host can calculate the ash value H of coal according to transmission photon counting N1 that obtains and annihilation radiation photon counting N2 according to following formula:
H＝A·K
2+B·K+C·(ln?N1
0-lnN1)+D
In the formula: K=(10 * N2/N1); N1
0The transmission photon counting that detector measurement arrives when not having coal on the belt can obtain by actual measurement before pick-up unit uses; A, B, C, D are undetermined coefficient, can utilize linear regression processing to obtain according to measurement result by the coal of known ash score value is measured.
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|---|---|---|---|
| CN2008100132240A CN101349661B (en) | 2008-09-17 | 2008-09-17 | Method for on-line detecting coal ashes on belt |
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|---|---|---|---|
| CN2008100132240A CN101349661B (en) | 2008-09-17 | 2008-09-17 | Method for on-line detecting coal ashes on belt |
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| CN101349661B true CN101349661B (en) | 2011-10-05 |
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| CN101907582B (en) * | 2010-06-23 | 2013-04-03 | 清华大学 | Full section scanning on-line detection device |
| CN102128840B (en) * | 2010-11-30 | 2013-11-06 | 湖南大学 | Method for automatically recognizing coal ash |
| CN102749345B (en) * | 2012-06-19 | 2015-07-22 | 内蒙古立信测控技术有限公司 | Multipoint type detection apparatus for ash content of coal |
| 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 |
| CN104849292A (en) * | 2015-06-10 | 2015-08-19 | 长沙敏衡测控科技有限公司 | Rapid coal quality analysis device |
| CN107290355A (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 alumina silica ratio analytical equipment of transmission-type bauxite and analysis method |
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| CN109164228A (en) * | 2018-09-14 | 2019-01-08 | 丹东东方测控技术股份有限公司 | A kind of pair of belt speed changes the online coal calorimetry system compensated |
| CN109164229A (en) * | 2018-09-14 | 2019-01-08 | 丹东东方测控技术股份有限公司 | A kind of online coal calorimetry system of laser assisted detection |
| CN109164237A (en) * | 2018-09-14 | 2019-01-08 | 丹东东方测控技术股份有限公司 | The online ash content of coal analyzer compensated can be changed to belt speed, moisture |
| CN109164240A (en) * | 2018-09-14 | 2019-01-08 | 丹东东方测控技术股份有限公司 | A kind of online ash content of coal analyzer of laser assisted detection |
| CN109164236A (en) * | 2018-09-14 | 2019-01-08 | 丹东东方测控技术股份有限公司 | The ash content of coal analysis system compensated can be changed to belt speed, moisture |
| CN109164233A (en) * | 2018-09-14 | 2019-01-08 | 丹东东方测控技术股份有限公司 | A kind of pair of belt speed changes the online ash content of coal analyzer compensated |
| CN109164232A (en) * | 2018-09-14 | 2019-01-08 | 丹东东方测控技术股份有限公司 | The ash content of coal analysis system compensated can be changed to moisture |
| CN109164234A (en) * | 2018-09-14 | 2019-01-08 | 丹东东方测控技术股份有限公司 | A kind of pair of belt speed changes the ash content of coal analysis system compensated |
| CN109164239A (en) * | 2018-09-14 | 2019-01-08 | 丹东东方测控技术股份有限公司 | A kind of pair of moisture changes the online ash content of coal analyzer compensated |
| CN109799250B (en) * | 2019-02-28 | 2022-04-29 | 安徽华润金蟾药业股份有限公司 | Method and equipment for online detection of ash content of processed traditional Chinese medicine decoction pieces |
| CN112304983A (en) * | 2020-04-13 | 2021-02-02 | 丹东东方测控技术股份有限公司 | Multi-detector type online ash content meter |
| CN113191452B (en) * | 2021-05-21 | 2022-03-01 | 中国矿业大学(北京) | Coal ash content online detection system based on deep learning and detection method thereof |
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Address after: 118002 Binjiang Middle Road, Dandong Development Zone, Liaoning, China, No. 136 Patentee after: Dandong Dongfang Measurement & Control Technology Co., Ltd. Address before: 118002 Binjiang Middle Road, Dandong Development Zone, Liaoning, China, No. 136 Patentee before: Dandong Dongfang Measurement & Control Technology Co., Ltd. |