CN102749344A - Determination method for ash content of coal based on single radioactive source - Google Patents
Determination method for ash content of coal based on single radioactive source Download PDFInfo
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- CN102749344A CN102749344A CN2012102032703A CN201210203270A CN102749344A CN 102749344 A CN102749344 A CN 102749344A CN 2012102032703 A CN2012102032703 A CN 2012102032703A CN 201210203270 A CN201210203270 A CN 201210203270A CN 102749344 A CN102749344 A CN 102749344A
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Abstract
The invention provides a determination method for the ash content of coal based on single radioactive source. The method comprises the steps of: collecting moderate-energy gamma rays and 32KeV X rays; analyzing signals collected; and analyzing and displaying response of ash content of coal and response of quality thickness. The method uses a multichannel data analysis spectrometer to receive the spectrum signals of moderate-energy gamma rays; through analyzing the obtained changes of the absorption peak of the 32KeV X rays the ash content of the coal is determined; the mass density of the coal is determined through detection of the changes of full-energy peak and the Compton plateau; and the affect from the changes of the mass density of the coal is amended through the mass density, thereby effectively improving the stability of the ash content determination. The method is simple and easy in operation, and has high reliability.
Description
Technical field
The present invention relates to coal ash content detector, be specifically related to a kind of ash content of coal detection method based on single radioactive source.
Background technology
At present, in various Measurement and analysis, utilize the gamma rays technology as a routine techniques.The lot of advantages that it has other analytical technology not have is for example utilized strong these characteristics of penetrability, and gamma rays just is used to the ash content in metal nondestructive examination and the coal many years ago.In recent years, the nuclear measuring technique that gamma rays is relevant is used more extensive, and for example it is in the application in fields such as cement, coal, ore.
Application number be 201010558605.4 patent of invention disclose a kind of three can the ash content of coal on-line measuring devices, this device comprises sample container and test section; Said test section comprises low energy gamma source Am241, middle ability gamma source Cs137, lanthanum bromide detector, multiple tracks data analysis spectrometer and silicon drifting detector; Coal sample in the gamma photons irradiation sampling receptacle of said low energy gamma source Am241 and middle ability gamma source Cs 137 emissions is through low middle can the reception by the lanthanum bromide detector by gamma rays of coal sample; The output terminal of said lanthanum bromide detector connects the input end of multiple tracks data analysis spectrometer; The low energy gamma shines on the coal sample, excites the characteristic X-ray of iron in the coal sample, calcium, aluminium simultaneously, and said silicon drifting detector is gathered this characteristic X-ray; The output terminal of said silicon drifting detector connects the input end of multiple tracks data analysis spectrometer; The output terminal of said multiple tracks data analysis spectrometer also is connected with industrial computer, under industrial computer control, the gamma-ray spectrometry information that collects and characteristic X-ray spectrum information is passed to data processing separate spectra system, separates spectra system by data processing and carries out data processing.Though this invention can be applied to come the coal automatic device for fast detecting of taking a sample into factory's coal automobile; Do not make the bypass belt, only directly make structural modification slightly, get final product installation and measuring in the rear end of sampling receptacle; But homogeneity is very poor, therefore can cause measurement result serious deviation to occur.
The technology of utilizing the dual intensity gamma rays to detect the ash component in the coal at present is very ripe, but because traditional dual intensity gamma technology, the ash content on the axis is visited in the just source of measurement; Belong to spot measurement; Representative poor, if the material uniformity coefficient is not enough, will cause measuring error bigger.And the restriction that the use of even more serious is radioactive source receives increasingly sharpens, and adds the low energy gamma source and depends on import, and cost is high, and delivery cycle can't in time guarantee.
Summary of the invention
In order to overcome the deficiency of above-mentioned prior art; The present invention provides a kind of ash content of coal detection method based on single radioactive source; Utilize many can the gamma ray spectrum signal in receiving to the data analysis spectrometer; The ash content of the change-detection coal of the X ray absorption peak through analyzing the 32KeV obtained; The mass density of the change-detection coal through detecting its full energy peak and Compton platform is revised because the influence that the Coal Quality variable density is brought effectively raises the ash content measuring stability through mass density.Not only effectively reduced the use of low energy radioactive source, saving cost that simultaneously can be a large amount of.
In order to realize the foregoing invention purpose, the present invention takes following technical scheme:
A kind of ash content of coal detection method based on single radioactive source said method comprising the steps of:
Step 1: the X ray of ability gamma rays and 32KeV in the collection;
Step 2: the signal that analyzing and processing is gathered;
Step 3: analyze and response of demonstration ash content of coal and mass thickness response.
In step 1; Can send by gamma source Cs-137 by middle by gamma rays in said; Can be positioned in the protection body of source by gamma source Cs-137 in said, be provided with collimating aperture in the protection body of said source, the central axis of said collimating aperture and said ray detector is on same horizontal line; The hole depth of said collimating aperture is 5～6cm, and the aperture is 1cm.
Coal sample in the gamma photons irradiation coal sample storehouse of said middle ability gamma source Cs-137 emission, ray detector collection see through the middle ability gamma ray spectrum signal of coal sample; The output terminal of said ray detector is connected through the input end of amplifier with multiple tracks data analysis spectrometer.
The coal sample produces the X ray of gamma ray and 32KeV simultaneously in the gamma photons irradiation coal sample storehouse of ability gamma source Cs-137 emission in said.
Said ray detector is NaI scintillation detector or lanthanum bromide detector, and said amplifier is a photomultiplier.
Said coal sample storehouse is 0.5～2 minute through the time interval of funnel samples of coal pulled.
Said coal sample storehouse, funnel and form the coal sample container with the automatic pumping board that is positioned at bottom, said coal sample storehouse; Said automatic pumping board is axial vertical with said coal sample storehouse; Said automatic pumping board connects automatic dust unloading control system, ability gamma source Cs-137, ray detector and multiple tracks data analysis spectrometer during said detecting device comprises; Coal sample in the gamma photons irradiation coal sample storehouse of ability gamma source Cs-137 emission in said; Said ray detector collection sees through the middle ability gamma ray spectrum signal of coal sample; The output terminal of said ray detector connects the input end of said multiple tracks data analysis spectrometer, and the output terminal of said multiple tracks data analysis spectrometer connects said automatically controlled machine.
Top, said coal sample storehouse is provided with and connects the measurement position inlet that Sampling Machine is abandoned the appearance outlet, and its underpart is provided with the measurement position outlet that connects automatic dust unloading control system.
Said automatic dust unloading control system comprises said automatic ash-discharging valve, speed reduction unit and screw motor, and said automatic ash-discharging valve is a star-shaped ash unloading valve, comprises housing, impeller and end cap; Said screw motor drives said wheel rotation through shaft coupling, evenly takes the material on said housing top to bottom.
Said source protection body is positioned at a side in said coal sample storehouse, and said ray detector is positioned at the opposite side in said coal sample storehouse.
The inside of said source protection body is plumbous, and the thickness of said lead is greater than 6cm.
The thickness of said source protection body shell is 1cm; Said shell be by carbon content be 0.10%, silicone content is 0.08%, manganese content is 0.065%, phosphorus content is 0.030%, sulfur content is 0.018%, chromium content is 15.6%, surplus is the alloy preparation of iron, described percentage is percent by weight.
Said collimating aperture is built-in with thin slice, can gamma source in said Cs-137 place on the said thin slice, its distance with the aperture of said collimating aperture is 0.5cm, the distance bottom said thin slice and the said collimating aperture is 0.1mm.
Said thin slice is spun glass or tygon grog sheet.
In the said step 2; Said multiple tracks data analysis spectrometer carries out A/D conversion and Digital Signal Analysis to the signal of gathering; The absorption peak of the X ray of said data processing and the said 32KeV of spectrum unscrambling systematic analysis obtains the ash content of coal response, and ability gamma rays 600KeV full energy peak obtains the mass thickness response of coal in the analysis.
In step 3, data processing and the response of spectrum unscrambling systematic analysis ash content of coal and mass thickness response are also passed through the online demonstration of display system.
Said automatically controlled machine comprises master control system, power supply, said data processing and separates spectra system, display system and signal transmission system; The output terminal of said multiple tracks data analysis spectrometer connects said signal transmission system; Signal after said master control system is handled multiple tracks data analysis spectrometer is transferred to data processing and separates spectra system through said signal transmission system.
Compared with prior art, beneficial effect of the present invention is:
1. the present invention adopts single radioactive source to substitute the function of two radioactive sources of dual intensity gamma Ash analyser, has effectively practiced thrift resource, simultaneously also a large amount of saving cost;
2. middle ability gamma source Cs-137 both serve as the absorption that the low energy gamma source detects high Z element in the coal, and the ability gamma source detects the mass thickness of coal in serving as again;
3. the X ray of the 32KeV that can gamma source Cs137 in utilizing produces serves as the low energy radioactive source, and the absorption that utilizes the X ray of 32KeV to pass coal detects the ash content response in the coal;
4. the full energy peak of the 600KeV that ability gamma source Cs137 produces in the utilization of the present invention and the absorption of Compton platform thereof detect the mass thickness response of coal, and compensation is because the influence that density or variation in thickness are brought;
5. the present invention can be applicable to admission coal automobile and comes the coal automatic fast detecting of taking a sample to put, and does not make the bypass belt, only directly makes structural modification slightly in the rear end of sampling receptacle, gets final product installation and measuring;
6. this method is simple, is prone to carry out, and reliability is high.
Description of drawings
Fig. 1 is an embodiment of the invention structural drawing.
Embodiment
Below in conjunction with accompanying drawing the present invention is done further explain.
A kind of ash content of coal detection method based on single radioactive source said method comprising the steps of:
Step 1: the X ray of ability gamma rays and 32KeV in the collection;
Step 2: the signal that analyzing and processing is gathered;
Step 3: analyze and response of demonstration ash content of coal and mass thickness response.
In step 1; Can send by gamma source Cs-137 by middle by gamma rays in said; Can be positioned in the protection body of source by gamma source Cs-137 in said, be provided with collimating aperture in the protection body of said source, the central axis of said collimating aperture and said ray detector is on same horizontal line; The hole depth of said collimating aperture is 5～6cm, and the aperture is 1cm.
Coal sample in the gamma photons irradiation coal sample storehouse of said middle ability gamma source Cs-137 emission, ray detector collection see through the middle ability gamma ray spectrum signal of coal sample; The output terminal of said ray detector is connected through the input end of amplifier with multiple tracks data analysis spectrometer.
The coal sample produces the X ray of gamma ray and 32KeV simultaneously in the gamma photons irradiation coal sample storehouse of ability gamma source Cs-137 emission in said.
Said ray detector is NaI scintillation detector or lanthanum bromide detector, and said amplifier is a photomultiplier.
Said coal sample storehouse is 0.5～2 minute through the time interval of funnel samples of coal pulled.
Said coal sample storehouse, funnel and form the coal sample container with the automatic pumping board that is positioned at bottom, said coal sample storehouse; Said automatic pumping board is axial vertical with said coal sample storehouse; Said automatic pumping board connects automatic dust unloading control system, ability gamma source Cs-137, ray detector and multiple tracks data analysis spectrometer during said detecting device comprises; Coal sample in the gamma photons irradiation coal sample storehouse of ability gamma source Cs-137 emission in said; Said ray detector collection sees through the middle ability gamma ray spectrum signal of coal sample; The output terminal of said ray detector connects the input end of said multiple tracks data analysis spectrometer, and the output terminal of said multiple tracks data analysis spectrometer connects said automatically controlled machine.
Top, said coal sample storehouse is provided with and connects the measurement position inlet that Sampling Machine is abandoned the appearance outlet, and its underpart is provided with the measurement position outlet that connects automatic dust unloading control system.
Said automatic dust unloading control system comprises said automatic ash-discharging valve, speed reduction unit and screw motor, and said automatic ash-discharging valve is a star-shaped ash unloading valve, comprises housing, impeller and end cap; Said screw motor drives said wheel rotation through shaft coupling, evenly takes the material on said housing top to bottom.
Said source protection body is positioned at a side in said coal sample storehouse, and said ray detector is positioned at the opposite side in said coal sample storehouse.
The inside of said source protection body is plumbous, and the thickness of said lead is greater than 6cm.
The thickness of said source protection body shell is 1cm; Said shell be by carbon content be 0.10%, silicone content is 0.08%, manganese content is 0.065%, phosphorus content is 0.030%, sulfur content is 0.018%, chromium content is 15.6%, surplus is the alloy preparation of iron, described percentage is percent by weight.
Said collimating aperture is built-in with thin slice, can gamma source in said Cs-137 place on the said thin slice, its distance with the aperture of said collimating aperture is 0.5cm, the distance bottom said thin slice and the said collimating aperture is 0.1mm.
Said thin slice is spun glass or tygon grog sheet.
In the said step 2; Said multiple tracks data analysis spectrometer carries out A/D conversion and Digital Signal Analysis to the signal of gathering; The absorption peak of the X ray of said data processing and the said 32KeV of spectrum unscrambling systematic analysis obtains the ash content of coal response, and ability gamma rays 600KeV full energy peak obtains the mass thickness response of coal in the analysis.
In step 3, data processing and the response of spectrum unscrambling systematic analysis ash content of coal and mass thickness response are also passed through the online demonstration of display system.
Said automatically controlled machine comprises master control system, power supply, said data processing and separates spectra system, display system and signal transmission system; The output terminal of said multiple tracks data analysis spectrometer connects said signal transmission system; Signal after said master control system is handled multiple tracks data analysis spectrometer is transferred to data processing and separates spectra system through said signal transmission system.
In sum; The present invention utilize many can the gamma ray spectrum signal in receiving to the data analysis spectrometer; The ash content of the change-detection coal of the X ray absorption peak through analyzing the 32KeV obtained; The mass density of the change-detection coal through detecting its full energy peak and Compton platform is revised because the influence that the Coal Quality variable density is brought effectively raises the ash content measuring stability through mass density.This method is simple, is prone to carry out, and reliability is high.
Should be noted that at last: above embodiment is only in order to technical scheme of the present invention to be described but not to its restriction; Although the present invention has been carried out detailed explanation with reference to the foregoing description; Under the those of ordinary skill in field be to be understood that: still can specific embodiments of the invention make amendment or be equal to replacement; And do not break away from any modification of spirit and scope of the invention or be equal to replacement, it all should be encompassed in the middle of the claim scope of the present invention.
Claims (17)
1. ash content of coal detection method based on single radioactive source is characterized in that: said method comprising the steps of:
Step 1: the X ray of ability gamma rays and 32KeV in the collection;
Step 2: the signal that analyzing and processing is gathered;
Step 3: analyze and response of demonstration ash content of coal and mass thickness response.
2. said ash content of coal detection method according to claim 1 based on single radioactive source; It is characterized in that: in step 1, said middle can sending by gamma source Cs-137 by middle by gamma rays, said middle can being positioned in the protection body of source by gamma source Cs-137; Be provided with collimating aperture in the protection body of said source; The central axis of said collimating aperture and said ray detector is on same horizontal line, and the hole depth of said collimating aperture is 5～6cm, and the aperture is 1cm.
3. said ash content of coal detection method according to claim 2 based on single radioactive source; It is characterized in that: the coal sample in the gamma photons irradiation coal sample storehouse of said middle ability gamma source Cs-137 emission, ray detector collection see through the middle ability gamma ray spectrum signal of coal sample; The output terminal of said ray detector is connected through the input end of amplifier with multiple tracks data analysis spectrometer.
4. said ash content of coal detection method based on single radioactive source according to claim 3 is characterized in that: the coal sample produces the X ray of gamma ray and 32KeV simultaneously in the gamma photons irradiation coal sample storehouse of ability gamma source Cs-137 emission in said.
5. said ash content of coal detection method based on single radioactive source according to claim 3 is characterized in that: said ray detector is NaI scintillation detector or lanthanum bromide detector, and said amplifier is a photomultiplier.
6. said ash content of coal detection method based on single radioactive source according to claim 3 is characterized in that: said coal sample storehouse is 0.5～2 minute through the time interval of funnel samples of coal pulled.
7. said ash content of coal detection method according to claim 2 based on single radioactive source; It is characterized in that: said coal sample storehouse, funnel and form the coal sample container with the automatic pumping board that is positioned at bottom, said coal sample storehouse; Said automatic pumping board is axial vertical with said coal sample storehouse; Said automatic pumping board connects automatic dust unloading control system, ability gamma source Cs-137, ray detector and multiple tracks data analysis spectrometer during said detecting device comprises; Coal sample in the gamma photons irradiation coal sample storehouse of ability gamma source Cs-137 emission in said; Said ray detector collection sees through the middle ability gamma ray spectrum signal of coal sample; The output terminal of said ray detector connects the input end of said multiple tracks data analysis spectrometer, and the output terminal of said multiple tracks data analysis spectrometer connects said automatically controlled machine.
8. said ash content of coal detection method according to claim 7 based on single radioactive source; It is characterized in that: top, said coal sample storehouse is provided with and connects the measurement position inlet that Sampling Machine is abandoned the appearance outlet, and its underpart is provided with the measurement position outlet that connects automatic dust unloading control system.
9. said ash content of coal detection method according to claim 7 based on single radioactive source; It is characterized in that: said automatic dust unloading control system comprises said automatic ash-discharging valve, speed reduction unit and screw motor; Said automatic ash-discharging valve is a star-shaped ash unloading valve, comprises housing, impeller and end cap; Said screw motor drives said wheel rotation through shaft coupling, evenly takes the material on said housing top to bottom.
10. said ash content of coal detection method based on single radioactive source according to claim 2, it is characterized in that: said source protection body is positioned at a side in said coal sample storehouse, and said ray detector is positioned at the opposite side in said coal sample storehouse.
11. said ash content of coal detection method based on single radioactive source according to claim 10 is characterized in that: the inside of said source protection body is for plumbous, and the thickness of said lead is greater than 6cm.
12. said ash content of coal detection method according to claim 11 based on single radioactive source; It is characterized in that: the thickness of said source protection body shell is 1cm; Said shell be by carbon content be 0.10%, silicone content is 0.08%, manganese content is 0.065%, phosphorus content is 0.030%, sulfur content is 0.018%, chromium content is 15.6%, surplus is the alloy preparation of iron, described percentage is percent by weight.
13. said ash content of coal detection method according to claim 2 based on single radioactive source; It is characterized in that: said collimating aperture is built-in with thin slice; Can place on the said thin slice by gamma source Cs-137 in said; The distance in the aperture of itself and said collimating aperture is 0.5cm, and the distance of said thin slice and said collimating aperture bottom is 0.1mm.
14. said ash content of coal detection method based on single radioactive source according to claim 13 is characterized in that: said thin slice is spun glass or tygon grog sheet.
15. said ash content of coal detection method according to claim 1 based on single radioactive source; It is characterized in that: in the said step 2; Said multiple tracks data analysis spectrometer carries out A/D conversion and Digital Signal Analysis to the signal of gathering; The absorption peak of the X ray of said data processing and the said 32KeV of spectrum unscrambling systematic analysis obtains the ash content of coal response, and ability gamma rays 600KeV full energy peak obtains the mass thickness response of coal in the analysis.
16. said ash content of coal detection method based on single radioactive source according to claim 5 is characterized in that: in step 3, data processing and the response of spectrum unscrambling systematic analysis ash content of coal and mass thickness response are also passed through the online demonstration of display system.
17. said ash content of coal detection method based on single radioactive source according to claim 16 is characterized in that: said automatically controlled machine comprises master control system, power supply, said data processing and separates spectra system, display system and signal transmission system; The output terminal of said multiple tracks data analysis spectrometer connects said signal transmission system; Signal after said master control system is handled multiple tracks data analysis spectrometer is transferred to data processing and separates spectra system through said signal transmission system.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111076777A (en) * | 2019-12-31 | 2020-04-28 | 乌鲁木齐海关技术中心 | Biochemical intelligent screening, examining and disposing system for customs nuclei |
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