CN2476814Y - Coal ash content investigating device - Google Patents
Coal ash content investigating device Download PDFInfo
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- CN2476814Y CN2476814Y CN 01213152 CN01213152U CN2476814Y CN 2476814 Y CN2476814 Y CN 2476814Y CN 01213152 CN01213152 CN 01213152 CN 01213152 U CN01213152 U CN 01213152U CN 2476814 Y CN2476814 Y CN 2476814Y
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- coal
- ash content
- radioactive source
- coal ash
- utility
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Abstract
The utility model relates to a coal ash measuring unit which adopts annihilation-radiation method. Existing coal ash measuring unit which adopts traditional dual-power ray method conducts low measuring accuracy when the ingredient scope or the moisture of the coal ash changes greatly. The utility model comprises a shield, a radioactive source, a NAI probe and a suction plate. The radioactive source adopts <60>CO ray, the suction plate is arranged at the front part of the NAI probe and a shielding material is positioned between the radioactive source and the NAI probe. With the structure, the utility model can conduct coal ash measurement continuously and conduct high accurate measurement when the ingredient scope or the moisture of the coal ash changes greatly.
Description
The utility model relates to a kind of ash content of coal analysis apparatus that uses the annihilation radiation method to measure ash content of coal.
In the prior art, traditional dual energy gamma ray method is utilized gamma-rays and matter interaction generation photoelectric effect, the atomic number Z of its reaction cross-section and material
4～5Be directly proportional; And the annihilation radiation method is utilized gamma-rays and matter interaction generation pair effect, the annihilation radiation of having measured positive negative electricity, and its reaction cross-section is directly proportional with the atomic number Z of material; With the measurement mechanism of dual energy gamma ray than with the uncertainty of the measurement mechanism of annihilation radiation method than low magnitude, and the ash content of coal composition range change or the precision of humidity mensuration ash content when changing greatly too low.
The purpose of this utility model provide a kind of can continuous coverage ash content of coal, and change or humidity is measured not susceptible to, the annihilation radiation method ash content of coal measurement mechanism that the precision of measurement is high when changing greatly at the ash content of coal composition range.
For achieving the above object the technical solution adopted in the utility model:
A kind of ash content of coal measurement mechanism, its special being: this device is made of shield 1, radioactive source 2, NaI probe 3 and baffle 4, and described radioactive source 2 is arranged on the telescopic mounting 5, between radioactive source 2 and the NaI probe 3 shielding material 6 is set; Described baffle 4 is arranged at the front end of NaI probe 3.
Above-mentioned radioactive source 2 adopts
60The CO gamma-rays.
Above-mentioned NaI probe 3 also can adopt the HpGe probe.
Above-mentioned radioactive source 2 places telescopic mounting 5 to be scalable screw rod.Below in conjunction with accompanying drawing the utility model is described in further detail:
Fig. 1 is a structural representation of the present utility model;
Fig. 2 is that the Calculation of Measuring Uncertainty of dual energy gamma ray method and annihilation radiation method compares;
Fig. 3 is Compton backscattering peak and annihilation radiation peak multiple tracks energy spectrogram;
Referring to Fig. 1, the utility model is made of shield 1, radioactive source 2, NaI probe 3, baffle 4, and described radioactive source 2 is arranged on the telescopic mounting 5, between radioactive source 2 and the NaI probe 3 shielding material 6 is set; Described baffle 4 is arranged at the front end of NaI probe 3.Above-mentioned radioactive source 2 adopts
60The CO gamma-rays.Above-mentioned NaI probe 3 also can adopt the HpGe probe.Above-mentioned radioactive source 2 places telescopic mounting 5 to be scalable screw rod.
The utility model adopts the annihilation radiation method to pass through
60CO radiation gamma coal sample, nuclear technology survey ash mainly according to contained medium in the raw coal (if be flammable owner's charcoal, hydrogen, also aerobic, nitrogen) with the difference of the equivalent atom number of mineral matter (be mainly silicon, aluminium, iron, calcium, magnesium, potassium, sodium, its oxide is ash content).By
60CO radiation gamma coal sample is measured the positron annihilation radiation peak that electron pair causes and the intensity of Compton backscattering peak and is determined ash content, as Fig. 3.Compton scattering intensity is only relevant with the volume density of raw coal, and that positron matter is buried in oblivion gamma-rays is both relevant with volume density, relevant with the atomic number of material again, when photon energy surpassed the threshold energy (1.022MeV) of electron pair, the probability of Compton scattering can be similar to be thought and is proportional to Z
j/ A
j, the probability that electron pair produces is proportional to ∑ Z
j 2W
j/ A
jZ wherein
j, W
j, A
jBe respectively atomic number, quality share and the atomic weight of j group element in the raw coal.The gross mass attenuation coefficient of coal can be used the mass attenuation coefficient match of ature of coal and mineral matter.The precision of this method depends on the yield of annihilation radiation and the degree of correlation between the coal ash.We are to 21 kinds of brown coal and 21 kinds of Fe
2O
3Content has carried out the Theoretical Calculation of dual energy gamma ray through transmission technique and annihilation radiation method greater than 10% assorted coal, because the electron pair cross section that produces only and Z
2Be directly proportional, rather than be directly proportional with 4～5 powers of z as photoelectric cross-section, as shown in Figure 2, the uncertainty of Compton radiation method is about half of dual intensity gamma ray through transmission technique.
When needs are measured ash content of coal, place radioactive source on the telescopic screw rod, can be according to using needs to regulate its telescopic level.The radioactivity sample-out count is up to state standards.Require the Compton scattering angle greater than 120 °
[2], the gamma-rays Compton backscattering energy of 1.3MeV is less than 0.27MeV like this.Coal sample places the aluminium vessel box, and 30 kinds of matchmaker's samples take a sample twice for every kind at least, and every kind of about 40kg of coal sample by adjusting, reaches unified geometric condition.
Adopt 7.4GBq
60The Co gamma ray radiator, every kind of coal sample is measured 5min.The multiple tracks power spectrum that records as shown in Figure 3.With
241Am (60keV),
137Cs (662keV) carries out energy calibration.(457～569keV) counting rate deducts the perception district, and (1.2 times of 574～681keV) counting rate, the factor 1.2 is slopes of the background at 0.511MeV annihilation radiation peak 0.511MeV the net counting rate y at annihilation radiation peak is for perception district.The compton meter digit rate is the above stored count rate k of 170keV.Ash content (ASH) can obtain by the following formula match: ASH=ak+by+c.A, b, c are the constants of least square fitting.By k, the y value of the unknown coal sample of a, b, c and mensuration, can obtain its ash content of coal content, thermal value.
For verifying its measuring accuracy, should satisfy the demarcation of system, also to gather and sample preparation, accurately measure the ash content ratio of coal sample.Need collect the different fully coal sample in the whole nation for this reason and test, measure the coal sample in 30 kinds of different places of production altogether, the ash content variation range is from 9%～46%, and the coal particle piece footpath that requires sampling is less than 20mm, and this is accomplished when the front end separating flow sampling.Because the measurement device coal ash is a kind of indirect measurement method that utilizes gamma-rays and matter interaction character.Whether this method is reliable, and the chemistry of calcination ash content that must be by routine is surveyed grey method as scale.Chemistry is surveyed grey method and is required fully to stir measuring coal sample, and division then continues division to 10kg with this 10kg coal, and big or small contraction is to 1mm, and 120g chemically examines out ash content.Guarantee that all square uncertainty is less than 0.1%.
We have developed a cover ash content measuring system on the basis of accurate Theory simulation and experiment.The utility model adopts advanced nuclear measuring technique, Computer Control Technology, can measure the important index such as ash value, thermal value of coal fast, and system bulk is little, adopts full-automatic computer management operation, installs, uses, safeguards very convenient.This system has good economic benefits and social benefit to rationally utilizing coal resources.
Automatic measurement of the present utility model requires to point out less pilot process as far as possible on screen, mainly providing coal ash ash content and density gets final product, for simplicity, we adopt assembly language program(me) to control whole measuring process, wherein also comprise with compilation calling the FORTRAN routine of handling the match ash content.It is fast, convenient with operating system interface that assembly language has travelling speed, can directly call characteristics such as higher level lanquage module.Software has the radioactivity decay than orthofunction, and a whole set of software carries Chinese character base, and the user can launch and compress used relevant document as required at any time, after the disk installation, enter the user from the sub-directory of establishing, software can not be copied, and has good confidentiality.
The utility model is with respect to prior art, and its advantage is as follows:
1, the utility model is to high Z element, and is low such as Fe, Ca sensitivity, can be at ash content of coal Mensuration ash content when composition range changes greatly, precision be than other method height, thereby can be widely used in firepower A large amount of units that use cleaned coal, raw coal such as power plant, coal preparation plant, colliery, coking plant, especially suitable Being used for the stove coal that advances that coal kind is various, the ash content of coal composition changes greatly monitors.
2, the utility model is insensitive to the humidity variation, and moisture changes below 7%, and ash content is measured Impact can be ignored.
3, the utility model can in extremely rapid succession carry out non-cpntact measurement, can adapt to coal industry The characteristics of adverse circumstances.
4, the utility model can be analyzed the ash content of coal content in coal seam thicker (greater than 30cm).
5, the utility model cost is low, can energy savings, economize on the use of funds, and can reduce pollution again.
Claims (4)
1, a kind of ash content of coal measurement mechanism, it is characterized in that: this device is made of shield (1), radioactive source (2), NaI probe (3), baffle (4), described radioactive source (2) is arranged on the telescopic mounting (5), between radioactive source (2) and the NaI probe (3) shielding material (6) is set; Described baffle (4) is arranged at the front end of NaI probe (3).
2, ash content of coal measurement mechanism according to claim 1 is characterized in that: above-mentioned radioactive source (2) adopts
60The CO gamma-rays.
3, ash content of coal self-operated measuring unit according to claim 1 is characterized in that: above-mentioned NaI probe (3) also can adopt the HpGe probe.
4, ash content of coal measurement mechanism according to claim 1 and 2 is characterized in that: it is scalable screw rod that above-mentioned radioactive source (2) places telescopic mounting (5).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 01213152 CN2476814Y (en) | 2001-04-04 | 2001-04-04 | Coal ash content investigating device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 01213152 CN2476814Y (en) | 2001-04-04 | 2001-04-04 | Coal ash content investigating device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2476814Y true CN2476814Y (en) | 2002-02-13 |
Family
ID=33632196
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 01213152 Expired - Fee Related CN2476814Y (en) | 2001-04-04 | 2001-04-04 | Coal ash content investigating device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2476814Y (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1940544B (en) * | 2006-09-26 | 2010-05-12 | 丹东东方测控技术有限公司 | High-precision on-line ash content measuring unit |
| CN101349661B (en) * | 2008-09-17 | 2011-10-05 | 丹东东方测控技术有限公司 | Method for on-line detecting coal ashes on belt |
| CN103149133A (en) * | 2013-02-05 | 2013-06-12 | 中国矿业大学 | Electromagnetic wave based coal dust detection method and device |
-
2001
- 2001-04-04 CN CN 01213152 patent/CN2476814Y/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1940544B (en) * | 2006-09-26 | 2010-05-12 | 丹东东方测控技术有限公司 | High-precision on-line ash content measuring unit |
| CN101349661B (en) * | 2008-09-17 | 2011-10-05 | 丹东东方测控技术有限公司 | Method for on-line detecting coal ashes on belt |
| CN103149133A (en) * | 2013-02-05 | 2013-06-12 | 中国矿业大学 | Electromagnetic wave based coal dust detection method and device |
| CN103149133B (en) * | 2013-02-05 | 2014-11-19 | 中国矿业大学 | Electromagnetic wave based coal dust detection method and device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |