CN104569021A - Passive coal ash content measurement device and method - Google Patents
Passive coal ash content measurement device and method Download PDFInfo
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- CN104569021A CN104569021A CN201510026431.XA CN201510026431A CN104569021A CN 104569021 A CN104569021 A CN 104569021A CN 201510026431 A CN201510026431 A CN 201510026431A CN 104569021 A CN104569021 A CN 104569021A
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Abstract
The invention provides a passive coal ash content measurement device. The passive coal ash content measurement device comprises a lead shielding cover arranged above coal to be measured; an antenna is arranged under the coal to be measured; the antenna is connected with a photoelectric converter by a low-noise detector; the photoelectric converter is connected with a signal processor by an amplifier; and the signal processor is connected with a terminal by a data transmission device. A measurement method comprises the measurement steps: the low-noise detector receives natural gamma rays sent by a radioactive source in the coal to be measured; a natural gamma ray signal received by the low-noise detector is transmitted to the photoelectric converter to be subjected to A/D conversion; the converted signal enters the amplifier to be subjected to energy grade analysis; the signal subjected to the energy grade analysis by the amplifier enters the data processor to be processed in a specific processing manner; and a result processed by the signal processor is sent to the terminal by the data transmission device to be displayed. The passive coal ash content measurement device has the characteristics of on-line safety and rapid measurement.
Description
Technical field
The invention belongs to ash content field of measuring technique, be specifically related to a kind of passive coal ash content investigating device and method thereof.
Background technology
Ash content of coal is coal at a certain temperature after Thorough combustion, the percent by weight of remainder.The thermal value of ash content and coal is closely related, is one of ature of coal evaluation and the Main Basis selling price.In coke, ash content often raises 1%, and when will cause smelting iron, coke ratio increases 2%-2.5%, and blast furnace per unit area yield reduces 2.5%-3%, and slag increases 2.7%-2.9%.Conventional calcination is surveyed ash side and is dispelled, and because operation is numerous, the retardation time of obtaining a result is long, the needs of monitoring at any time can not be met, therefore, in production, be sought after ash content of coal On-line rapid measurement means, ash can be monitored at any time, timely adjusting process parameter and the operation of decision Distribution Warehouse.
At present, the common method that ash content of coal is measured has muffle furnace calcination method and dual energy gamma ray absorption process, wherein with maximum, the widest in industry spot of dual energy gamma ray absorption process.Its implementation is, the low energy adopting two isotope radioactive source Am241 and Cs137 to send respectively and middle energy gamma-rays irradiate the coal on belt, then at the opposite side of belt, receive the ray after projection coal.Because the different material in coal is different to the absorption efficiency of the ray of these two kinds of energy, heavy element particularly in coal will much larger than other light elements in coal to the absorption efficiency of the low-energyγ-ray that Am241 sends, therefore according to comparing the forward and backward Strength Changes of two kinds of ray projection coal, the ash value obtaining coal can just can be analyzed.But dual energy gamma ray absorption process exists radiogenic poor stability, once lose or reveal radiographic source, can cause larger harm to environment or the person, therefore radiographic source must accept strict control, needs in the application to pay larger expense every year for this reason; And dual intensity Г attenuation sensors is subject to Coal Seam Thickness Change (fluctuations in discharge), piles up change of shape, coal seam weight difference, affects ash content of coal accuracy of measurement.The advantage of muffle furnace calcination method is low price, and accuracy is high, but its Measuring Time reaches a few hours, inefficiency, is difficult to adapt to modern production on-the-spot.
Summary of the invention
For overcoming above-mentioned the deficiencies in the prior art, the object of the present invention is to provide a kind of passive coal ash content investigating device and method thereof, carrying out ash content measurement by the natural ray emission of coal self; 2) measuring is without external radiation; Adopt low noise detector and photomultiplier and digital signal processor to form and measure hardware; The method measured is realized based on digital signal processor; There is the feature of safety on line, Quick Measurement.
For achieving the above object, the technical solution used in the present invention is: a kind of passive coal ash content investigating device, comprises the lead shield cover be located at above coal to be measured; Be provided with antenna below coal to be measured, antenna is connected with photoelectric commutator by low noise detector; Photoelectric commutator is connected with signal processor by amplifier; Signal processor is connected with terminating machine by data transmission device.
Described low noise detector adopts ultrasonic probe.
The effect of described lead shield cover reduces the x radiation x from the earth in universe itself, the main ray accepted from coal sample to be measured.
A kind of passive ash content of coal measuring method, comprises the following steps:
Step 1, low noise detector receives the natural gamma ray sent from radioactive source in coal to be measured;
Step 2, the natural gamma ray signal received by low noise detector is passed to photoelectric commutator and is converted to electric signal;
Step 3, the electric signal after step 2 is changed enters amplifier and amplifies, and then carries out A/D conversion;
Step 4, through A/D conversion signal by dsp chip process, first concrete treatment scheme carries out auto adapted filtering process, remove the Noise and Interference outside signal frequency range, then level analysis is carried out to the pulse that the gamma-rays ion of different-energy produces, then add up each energy level count number and total pulse count amount.
Step 5, result signal processor processes crossed delivers to terminating machine display by data transmission device.
The invention has the beneficial effects as follows:
The present invention obtains ash content information by carrying out measurement to the radioactive nuclide self contained in coal.Radioactive nuclide, at occurring in nature ubiquity, has a certain amount of natural radioactive element (as uranium, thorium and potassium etc.) in rock and soil.Coal is no exception, and mineral matter (ash content) ratio organic (volatile matter) in fire coal is containing more radioelement.These radioelement can think some small radioactive sources, when the natural gamma ray that they are launched and ambient substance (as the mineral matter in coal and organic matter) interact, the energy of natural gamma ray is just assembled to low energy direction, thus form " low-energy peak ", the spectral line shape of this " low-energy peak " forms relevant with peak area with the composition of coal, that is relevant from the Elemental redistribution state of the different effective atomic numbers had in coal.Utilize this information, fast monitored can be carried out to coal ash content.Natural radioactivity information is combined with coal amount signal, the degree of confidence of coal-fired online ash content monitoring can be made to improve further.
Because the size of coal amount has a direct impact gamma ray radiation quantity, the present invention utilizes ultrasonic probe to carry out full cross-sectioning to conveying belt, improves ash content measured value degree of accuracy.
Because in coal, the content of natural radioactivity ray is very low, therefore the gamma-ray detection assembly of high sensitivity, low noise is needed, in conjunction with good structural design, mask the radiation from physical environment, in conjunction with digital processing algorithm, device of the present invention makes the natural radioactivity determination ash content of coal in measurement coal become feasible.
Accompanying drawing explanation
Fig. 1 is the theory diagram of measurement mechanism of the present invention.
Fig. 2 is digital signal processing process flow diagram of the present invention.
Embodiment
Below in conjunction with accompanying drawing, the present invention is described in further detail.
See Fig. 1, a kind of passive coal ash content investigating device, comprises the lead shield cover be located at above coal to be measured; Be provided with antenna below coal to be measured, antenna is connected with photoelectric commutator by low noise detector; Photoelectric commutator is connected with signal processor by amplifier; Signal processor is connected with terminating machine by data transmission device.
See Fig. 2, a kind of passive ash content of coal measuring method, comprises the following steps:
Step 1, low noise detector receives the natural gamma ray sent from radioactive source in coal to be measured;
Step 2, the natural gamma ray signal received by low noise detector is passed to photoelectric commutator and is converted to electric signal;
Step 3, the electric signal after step 2 is changed enters amplifier and amplifies, and then carries out A/D conversion;
Step 4, through A/D conversion signal by dsp chip process, first concrete treatment scheme carries out auto adapted filtering process, remove the Noise and Interference outside signal frequency range, then level analysis is carried out to the pulse that the gamma-rays ion of different-energy produces, then a statistics energy level count number and total pulse count amount.
Step 5, result signal processor processes crossed delivers to terminating machine display by data transmission device.
The present invention also can have other various embodiments, can be used for coal ash content that is online and off-line and detects.When not deviating from the present invention's spirit and essence thereof, those of ordinary skill in the art are when making various corresponding change and distortion according to the present invention, but these change accordingly and are out of shape the protection domain that all should belong to the claims in the present invention.
Claims (3)
1. a passive coal ash content investigating device, is characterized in that, comprises the lead shield cover be located at above coal to be measured; Be provided with antenna below coal to be measured, antenna is connected with photoelectric commutator by low noise detector; Photoelectric commutator is connected with signal processor by amplifier; Signal processor is connected with terminating machine by data transmission device.
2. will remove the passive coal ash content investigating device of the one described in 1 according to right, it is characterized in that, described low noise detector adopts ultrasonic probe.
3. a passive ash content of coal measuring method, is characterized in that, comprise the following steps:
Step 1, low noise detector receives the natural gamma ray sent from radioactive source in coal to be measured;
Step 2, the natural gamma ray signal received by low noise detector is passed to photoelectric commutator and is converted to electric signal;
Step 3, the electric signal after step 2 is changed enters amplifier and amplifies, and then carries out A/D conversion;
Step 4, through A/D conversion signal by dsp chip process, first concrete treatment scheme carries out auto adapted filtering process, remove the Noise and Interference outside signal frequency range, then level analysis is carried out to the pulse that the gamma-rays ion of different-energy produces, then add up each energy level count number and total pulse count amount.
Step 5, result signal processor processes crossed delivers to terminating machine display by data transmission device.
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| CN201510026431.XA CN104569021A (en) | 2015-01-20 | 2015-01-20 | Passive coal ash content measurement device and method |
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| CN201510026431.XA CN104569021A (en) | 2015-01-20 | 2015-01-20 | Passive coal ash content measurement device and method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110618232A (en) * | 2019-09-25 | 2019-12-27 | 西安阿尔特测控技术有限公司 | Online coal calorific value measuring device without radioactive source and method thereof |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101975783A (en) * | 2010-08-30 | 2011-02-16 | 清华大学 | Measurement device for simultaneously measuring ash content and water content |
| CN102954971A (en) * | 2012-11-05 | 2013-03-06 | 西安热工研究院有限公司 | Thermal power plant coal quality online monitoring system based on nature gamma spectrum analysis, and method thereof |
| CN203025120U (en) * | 2013-01-05 | 2013-06-26 | 开封市测控技术有限公司 | Online ash content detecting device |
| CN104198503A (en) * | 2014-08-19 | 2014-12-10 | 开封市测控技术有限公司 | Online coal ash content measurement system and method based on natural gamma rays |
| CN204495750U (en) * | 2015-01-20 | 2015-07-22 | 西安阿尔特测控技术有限公司 | A kind of passive coal ash content investigating device |
-
2015
- 2015-01-20 CN CN201510026431.XA patent/CN104569021A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101975783A (en) * | 2010-08-30 | 2011-02-16 | 清华大学 | Measurement device for simultaneously measuring ash content and water content |
| CN102954971A (en) * | 2012-11-05 | 2013-03-06 | 西安热工研究院有限公司 | Thermal power plant coal quality online monitoring system based on nature gamma spectrum analysis, and method thereof |
| CN203025120U (en) * | 2013-01-05 | 2013-06-26 | 开封市测控技术有限公司 | Online ash content detecting device |
| CN104198503A (en) * | 2014-08-19 | 2014-12-10 | 开封市测控技术有限公司 | Online coal ash content measurement system and method based on natural gamma rays |
| CN204495750U (en) * | 2015-01-20 | 2015-07-22 | 西安阿尔特测控技术有限公司 | A kind of passive coal ash content investigating device |
Non-Patent Citations (2)
| Title |
|---|
| 彭勇等: "NGAM-2008天然射线灰分仪在原煤煤质检测中的研究应用", 《煤质技术》 * |
| 程小平等: "利用天然伽马射线全能谱测量煤灰分的初探", 《山西矿业学院学报》 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110618232A (en) * | 2019-09-25 | 2019-12-27 | 西安阿尔特测控技术有限公司 | Online coal calorific value measuring device without radioactive source and method thereof |
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