CN1242518A - Micro-wave method for investigating moisture content of coal layer in coal mine - Google Patents
Micro-wave method for investigating moisture content of coal layer in coal mine Download PDFInfo
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- CN1242518A CN1242518A CN 98110961 CN98110961A CN1242518A CN 1242518 A CN1242518 A CN 1242518A CN 98110961 CN98110961 CN 98110961 CN 98110961 A CN98110961 A CN 98110961A CN 1242518 A CN1242518 A CN 1242518A
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Abstract
The method for measuring water content of coal layer by using microwave technology is characterized by that using microwave interferometer with narrow-band linear frequency modulation system, utilizing the non-contact measuremtn of antenna of said wirowave interferometer and measured coal layer sample, adopting phase method and power attenuation method to make technical treatment simultaneously, comparing the measured value with calibration curve and using computer to make data processing so as to implement water content measurement of coal layer. Its measurement method is reliable, as compared with measured value obtained by weighting method its measurement error is less than 0.5%. Said invention can be extensively used in the fields of building material, grain storage and paper-making industries.
Description
The present invention relates to a kind of method that adopts the microwave measurement bed moisture.
At present, domestic relevant industry especially steel industry all adopts artificial timing to take the laboratory of taking then of coal sample to pulverize, dry, weigh to the moisture content of coal measurement, calculates the humidity of producing coal again.At more American-European developed industrial countries, mainly adopt microwave transmission method, microwave reflection and microwave phase method to measure bed moisture.Because the amplitude of microwave is subjected to degree of stability, coal seam surface configuration, the coal seam grain size of microwave radiation source output power, the condition effect such as coupling of microwave system, reliability and detection sensitivity are lower, at present, generally do not do accurate measurement.The microwave phase method can overcome above-mentioned deficiency, but technology is complicated.The phase type microwave moisture teller of producing as German Berthoid company and Australian MCI company has all adopted microlock, the high Frequency Stabilization Technique of heterodyne, make this class moisture teller involve great expense (at present nearly 1,000,000 yuans one of Chinese market), debug difficulties is difficult for promoting.
The objective of the invention is to carry out the method for real-time measurement of moisture content of coal for relevant industry especially steel industry provides a kind of microwave moisture teller with production domesticization.
Technical scheme of the present invention is such: a kind of method of microwave measurement bed moisture, it is characterized in that: the microwave interferometer of using arrowband linear frequency modulation system, by the antenna of this microwave interferometer and the non-cpntact measurement of tested coal seam sample, the technical measures that adopt phase method and power attenuated method to carry out simultaneously, with measured value and calibration curve compares and carry out data processing by computing machine, moisture measurement is made in the coal seam.
Because the present invention has adopted above method, available simple means are carried out the measurement of real-time coal seam water cut to various coal seams, can save the great amount of manpower and the energy, and measure accurately and reliably.
In order further to understand performance of the present invention, feature and advantage, now the present invention is done detailed explanation in conjunction with an embodiment and accompanying drawing.
Fig. 1 is that the system of measuring method of the present invention connects block diagram.
The method of a kind of microwave measurement bed moisture of the present invention, use the microwave interferometer 1 of arrowband linear frequency modulation system, by the antenna 2 of this microwave interferometer and the non-cpntact measurement of tested coal seam sample 3, the technical measures that adopt phase method and power attenuated method to carry out simultaneously, enter computing machine 5 after measured value and calibration curve compared and carry out data processing, moisture measurement is made in the coal seam.
The present invention has adopted the microwave interferometer of homemade arrowband linear frequency modulation system, and the key technical indexes of this microwave interferometer is:
Measuring accuracy 0.5%
Central task frequency 3GHz
Modulating bandwidth 100MHz
Centre frequency is 3Ghz
Fm linearity 1%
Output power 40mW
Operating ambient temperature-30～+ 40 ℃
The technical measures that the present invention has adopted phase method and power attenuated method to carry out have simultaneously improved measuring accuracy, but the measuring error that modifying factor coal particle size causes.Specific practice is: the measured value of phase method and damped method is compared, and greater than 0.5%, the mean value of then getting two values is measured value as two differences that are worth.Less than 0.5%, then getting phase-shift value is measured value as two value difference values.
Described phase method is: the two paths of signals of using the microwave interference instrument output of arrowband linear frequency modulation system, that is: the one tunnel is through the measured signal of tested coal seam sample, one the tunnel is not pass through the related signal of tested coal seam sample, and this two paths of signals is believed comparison, gets its phase-shift phase.Described power attenuated method is: directly the Electromgnetically-transparent with microwave interferometer arrives tested coal seam, gets its damping capacity.
Phase place and deamplification that the present invention is obtained by the Computer Processing microwave interferometer can show phase place and pad value in real time.Adopt friendly Hanzify computer interface, make operating personnel in the menu that shows, select tested coal, can show the moisture content value of current coal with keyboard.
The present invention adopts corresponding calibration curve according to measured different coal.Calibration curve is phase place calibration curve and attenuation calibration curve, the method of its formation is: every kind of coal is made the different coal sample of at least 20 water cut (water cut 7%～20%), the water cut of coal is determined in the laboratory weight method, after coal sample baking is soon done, add water in proportion, form the certified reference coal of different moisture content.The average grain of coal sample is measured these coal samples of a certain coal with microwave interferometer then less than 10mm.Because the water cut of coal sample is known, phase measurement, attenuation measurements and water cut can be formed two calibration curves of a certain coal.
The method that the present invention makes calibration sample is:
A. adopt 2 kilograms of coal samples to make calibration sample 3;
B. adopting wall thickness is 20mm, and length is that the foamed plastic container of 300 * 200 * 200mm is that sample box 4 is put coal sample and measured;
C. adopt the method for in container, pressing coal sample, make same weight but the coal sample of different moisture content has consistent thickness when measuring, and surfacing.
The antenna 2 of microwave interferometer answers hold in range to be to tested coal seam calibration sample 3 apart from d among the present invention:
30cm≤d≤50cm
Now, in conjunction with the accompanying drawings the present invention is done following detailed description again by the concrete steps of actual measurement.
1) under the instrument idle condition, regulate the amplitude of the microwave source modulation signal (modulation signal of frequency modulation type microwave interferometer is sawtooth or triangular wave normally) of microwave interferometer 1, the phase-shift phase that makes interferometer is for minimum; 2) by computer recording phase-shift phase and the signal amplitude of this moment; 3) tested coal seam sample 3 is put into sample box 4 and fill up, then sample box 4 is placed between two antennas 2, sample box face center and antenna actinal surface center are at a straight line, and it apart from d is: 30cm≤d≤50cm; 4) measure the phase-shift phase and the damping capacity in coal seam, obtain two moisture content value in coal seam by phase place and attenuation calibration curve; 5) as two moisture content value difference≤0.5%, then the phase method measured value is actual moisture content value, and as poor＞0.5% of two values, the root-mean-square value of then getting two values is actual moisture content value.
Coal seam average diameter of particles≤10mm when measuring then adopts the phase place calibration curve, and step 5) can be omitted; Otherwise then must completing steps 1), 2), 3) and, 4), 5);
The present invention was through 7 months test, and hundreds of of test data proves that this measuring method is reliable.Compare with the weight method measured value, measuring error is less than 0.5%.Can be widely used in building material industry, grain storage and paper-making industry etc.
Claims (7)
1. the method for a microwave measurement bed moisture, it is characterized in that: the microwave interferometer of using arrowband linear frequency modulation system, by the antenna of this microwave interferometer and the non-cpntact measurement of tested coal seam sample, the technical measures that adopt phase method and power attenuated method to carry out simultaneously, enter computing machine after measured value and calibration curve compared and carry out data processing, moisture measurement is made in the coal seam.
2. the method for microwave measurement bed moisture according to claim 1, it is characterized in that: described phase method is: the two paths of signals of using the microwave interference instrument output of arrowband linear frequency modulation system, that is: the one tunnel is through the measured signal of tested coal seam sample, one the tunnel is not pass through the measured signal of tested coal seam sample, this two paths of signals is carried out the phase bit comparison, get its phase-shift phase.
3. the method for microwave measurement bed moisture according to claim 1 is characterized in that: described power attenuated method is: directly the Electromgnetically-transparent with microwave interferometer arrives tested coal seam, gets its damping capacity.
4. according to the method for claim 1 or 2 or 3 described microwave measurement bed moistures, it is characterized in that: the measured value of phase method and power attenuated method is compared, and greater than 0.5%, the mean value of then getting two values is measured value as two differences that are worth; Less than 0.5%, then get phase-shift value as two differences that are worth as measured value.
5. the method for microwave measurement bed moisture according to claim 1; it is characterized in that: described calibration curve is phase place calibration curve and attenuation calibration curve; that is: adopt every kind of coal under the situation of particle basically identical; at least the coal sample of 20 different moisture content values (water cut is 7%～20%) is measured; phase measurement, attenuation measurements are formed two calibration curves of each coal, be phase place calibration curve and attenuation calibration curve.
6. the method for the moisture content in microwave measurement according to claim 1 coal seam is characterized in that: during described coal seam average diameter of particles≤10mm, adopt phase method to measure.
7. the method for microwave measurement bed moisture according to claim 1 is characterized in that: during described coal seam average diameter of particles＞10mm, and the method that adopts phase method and power attenuated method to carry out simultaneously.
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| Application Number | Priority Date | Filing Date | Title |
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| CN 98110961 CN1242518A (en) | 1998-07-16 | 1998-07-16 | Micro-wave method for investigating moisture content of coal layer in coal mine |
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| CN 98110961 CN1242518A (en) | 1998-07-16 | 1998-07-16 | Micro-wave method for investigating moisture content of coal layer in coal mine |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101907578A (en) * | 2009-06-05 | 2010-12-08 | 西安阿尔特科技实业发展有限责任公司 | Realization method of microwave-method cotton moisture-regain on-line measuring system |
| CN101095045B (en) * | 2004-12-30 | 2011-01-05 | 空中客车法国公司 | System for detecting, quantifying and/or locating water in aircraft sandwich structures and methods for using this system |
| CN102270265A (en) * | 2010-06-07 | 2011-12-07 | 鞍钢股份有限公司 | Online detection method for moisture of mixture |
| CN102401803A (en) * | 2010-09-08 | 2012-04-04 | 中国科学院电子学研究所 | Grain moisture condensation detection system based on microwave technology |
| CN102590232A (en) * | 2011-01-18 | 2012-07-18 | 丹东东方测控技术有限公司 | Non-linear automatic correction method for moisture detection of on-line microwave moisture meter |
| CN103207189A (en) * | 2013-01-22 | 2013-07-17 | 毛世挺 | Designing of circuit for measurement of wood moisture content by using microwave technology |
| AT14962U1 (en) * | 2014-11-13 | 2016-09-15 | Dunakontroll Irányitástechnikai Kft | High-frequency measuring system for measuring the moisture content of paper and various fibrous materials |
| CN106052879A (en) * | 2016-05-23 | 2016-10-26 | 中国科学院东北地理与农业生态研究所 | Litter layer transmittance measuring device and measuring method |
| CN108535283A (en) * | 2018-06-08 | 2018-09-14 | 宝鸡市赛孚石油机械有限公司 | A kind of crude oil stock tank oil (s.t.o.) device for detecting water content and its detection method |
| CN108844969A (en) * | 2018-05-31 | 2018-11-20 | 山东东山新驿煤矿有限公司 | A kind of coal on mine conveyer belt purity determination system |
| 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 |
-
1998
- 1998-07-16 CN CN 98110961 patent/CN1242518A/en active Pending
Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101095045B (en) * | 2004-12-30 | 2011-01-05 | 空中客车法国公司 | System for detecting, quantifying and/or locating water in aircraft sandwich structures and methods for using this system |
| CN101907578A (en) * | 2009-06-05 | 2010-12-08 | 西安阿尔特科技实业发展有限责任公司 | Realization method of microwave-method cotton moisture-regain on-line measuring system |
| CN102270265A (en) * | 2010-06-07 | 2011-12-07 | 鞍钢股份有限公司 | Online detection method for moisture of mixture |
| CN102270265B (en) * | 2010-06-07 | 2015-07-08 | 鞍钢股份有限公司 | Online detection method for moisture of mixture |
| CN102401803A (en) * | 2010-09-08 | 2012-04-04 | 中国科学院电子学研究所 | Grain moisture condensation detection system based on microwave technology |
| CN102590232B (en) * | 2011-01-18 | 2014-06-04 | 丹东东方测控技术股份有限公司 | Non-linear automatic correction method for moisture detection of on-line microwave moisture meter |
| CN102590232A (en) * | 2011-01-18 | 2012-07-18 | 丹东东方测控技术有限公司 | Non-linear automatic correction method for moisture detection of on-line microwave moisture meter |
| CN103207189A (en) * | 2013-01-22 | 2013-07-17 | 毛世挺 | Designing of circuit for measurement of wood moisture content by using microwave technology |
| AT14962U1 (en) * | 2014-11-13 | 2016-09-15 | Dunakontroll Irányitástechnikai Kft | High-frequency measuring system for measuring the moisture content of paper and various fibrous materials |
| CN106052879A (en) * | 2016-05-23 | 2016-10-26 | 中国科学院东北地理与农业生态研究所 | Litter layer transmittance measuring device and measuring method |
| CN106052879B (en) * | 2016-05-23 | 2018-10-09 | 中国科学院东北地理与农业生态研究所 | A kind of measuring device and measuring method of litter transmitance |
| CN108844969A (en) * | 2018-05-31 | 2018-11-20 | 山东东山新驿煤矿有限公司 | A kind of coal on mine conveyer belt purity determination system |
| CN108844969B (en) * | 2018-05-31 | 2020-07-24 | 山东东山新驿煤矿有限公司 | Coal-feeding purity measuring system for mine conveying belt |
| CN108535283A (en) * | 2018-06-08 | 2018-09-14 | 宝鸡市赛孚石油机械有限公司 | A kind of crude oil stock tank oil (s.t.o.) device for detecting water content and its detection method |
| 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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Effective date of registration: 20020211 Address after: 201900, Fujin Road, Shanghai, Baoshan District orchard Applicant after: Baoshan Iron & Steel Co., Ltd. Co-applicant after: Shanghai Inst. of Technical Physics, Chinese Academy of Sciences Address before: 200941 Baosteel District, Shanghai, Baoshan District Applicant before: Baoshan Iron & Steel (Group) Co., Ltd. Co-applicant before: Shanghai Inst. of Technical Physics, Chinese Academy of Sciences |
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