CN204374103U - The online Coal ' moisture measuring system of microwave method - Google Patents
The online Coal ' moisture measuring system of microwave method Download PDFInfo
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- CN204374103U CN204374103U CN201520036463.3U CN201520036463U CN204374103U CN 204374103 U CN204374103 U CN 204374103U CN 201520036463 U CN201520036463 U CN 201520036463U CN 204374103 U CN204374103 U CN 204374103U
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Abstract
The online Coal ' moisture measuring system of microwave method, include directional coupler, one end of directional coupler is connected with isolator by attenuator, and isolator is connected with microwave signal source; The other end of directional coupler is connected with reference to frequency converter; Be connected with power splitter, intermediate frequency amplifier A respectively with reference to frequency converter; Power splitter is connected with microwave local oscillator, receiving cable frequency converter; Intermediate frequency amplifier A is connected with signal processor; Signal processor is connected with receiving cable frequency converter by intermediate frequency amplifier B; Signal processor is connected with terminating machine by data output device; Receiving cable frequency converter is connected with low acoustic amplifier; Directional coupler is connected with emitting antenna; Low acoustic amplifier is connected with receiving antenna; Microwave signal source produces microwave signal, and high-frequency signal is irradiated coal by emitting antenna; Receiving antenna pickup is transmitted through the microwave signal of coal; High-frequency signal before picked up microwave signal transmission coal is detected; Have that error is little, precision is high and fireballing feature.
Description
Technical field
The utility model belongs to Coal ' moisture detection technique field, is specifically related to the online Coal ' moisture measuring system of a kind of microwave method.
Background technology
Coal ' moisture content determines the commercial production problems such as production technology data, energy-conserving and environment-protective and economic interests.Existing oven dry is weighed and is surveyed water and infrared survey water and all be unable to do without oven dry and weigh, what it surveyed water is remove moisture from wet coal at all, as long as wet coal is heated to a certain degree, within the regular hour, moisture just can evaporate completely, and remaining quality is dry coal quality.As long as weighing precision is high, the running time is grasped strict, and its error is necessarily very little, is also easy to be up to state standards.Infrared drying is surveyed water and only huge drying baker is removed, and change infrared drying into, its measurement means is the improvement, but method shows no sign of change.Direct oven drying method test process is very long, often can not adapt to the requirement that modern industry is produced.
Summary of the invention
For overcoming above-mentioned the deficiencies in the prior art, the purpose of this utility model is to provide a kind of microwave method online Coal ' moisture measuring system, has that error is little, precision is high and fireballing feature.
For achieving the above object, the technical solution adopted in the utility model is: the online Coal ' moisture measuring system of a kind of microwave method, and include directional coupler, one end of directional coupler is connected with isolator by attenuator, and isolator is connected with microwave signal source; The other end of directional coupler is connected with reference to frequency converter; Be connected with power splitter, intermediate frequency amplifier A respectively with reference to frequency converter; Power splitter is connected with microwave local oscillator, receiving cable frequency converter; Intermediate frequency amplifier A is connected with signal processor; Signal processor is connected with receiving cable frequency converter by intermediate frequency amplifier B; Signal processor is connected with terminating machine by data output device; Receiving cable frequency converter is connected with low acoustic amplifier; Directional coupler is connected with emitting antenna; Low acoustic amplifier is connected with receiving antenna.
The microwave frequency of described microwave signal source is 1GHz-40GHz.
The beneficial effects of the utility model are:
Compared with prior art, the utility model adopts the methods such as the microwave measurement side of decay phase place, impedance reflection to the utility model, obtains measurement result by the water in coal to the influence degree of electromagnetic transmission.Employing prior art is measured, the time that at every turn need spend do not wait for 30 minutes to 4 hours.And obtain tens of measurement data with microwave test is per second; And dry the moisture measured and only can obtain sample, and microwave measurement can scan to the coal on belt, obtains the data that more can embody overall moisture.
The specific inductive capacity of water is 75, and the specific inductive capacity of coal is about 5; The tangent loss angle of water is 0.15-1.2 (1G-30G), and the tangent loss angle of coal is 0.001-0.05 (1G-30G), moisture and coal have very large difference to electromagnetic loss and phase shift impact as can be seen here, with the moisture that the utility model detects coal can realize fast, non-cpntact measurement.Be embodied in:
1) measure with the microwave that frequency is 1GHz-40GHz.
2) it is non-contacting for measuring.
3) adopt phase place and range parameter elimination coal granularity and density on the impact of measurement result.
4) high measurement speed is realized based on digital processor.
Accompanying drawing explanation
Fig. 1 is structured flowchart of the present utility model.
Embodiment
Below in conjunction with accompanying drawing, structural principle of the present utility model and principle of work are described in further detail.
See Fig. 1, the online Coal ' moisture measuring system of a kind of microwave method, include directional coupler, one end of directional coupler is connected with isolator by attenuator, and isolator is connected with microwave signal source; The other end of directional coupler is connected with reference to frequency converter; Be connected with power splitter, intermediate frequency amplifier A respectively with reference to frequency converter; Power splitter is connected with microwave local oscillator, receiving cable frequency converter; Intermediate frequency amplifier A is connected with signal processor; Signal processor is connected with receiving cable frequency converter by intermediate frequency amplifier B; Signal processor is connected with terminating machine by data output device; Receiving cable frequency converter is connected with low acoustic amplifier.
The microwave frequency of described microwave signal source is 1GHz-40GHz.
Microwave is when transmitted through coal, coal inner conductive particle is elongated and queueing discipline in microwave radiation field, produces micro-current, this current dissipation part microwave energy, thus show the decay of microwave energy, cause the change of the Electromagnetism Characteristics of medium.Hydrone is polar molecule, and the coal fiber non-polar molecule that to be the degree of polymerization large, so microwave penetration coal and the decay produced derive from the micro-current of hydrone.Therefore, we can calculate water cut according to the number of damping capacity.The energy of unit volume dielectric absorption, namely unit volume dielectric to the damping capacity of microwave is:
A＝(2πd/λ)ε/2(1+tg2δ-1)
In formula, A is Amount of Decay of Microwaves, and d is the thickness of medium, and λ is microwave wavelength, and ε is total dielectric constant, and tg δ is total dielectric loss.
As can be seen from the above equation, for the change of microwave energy, mainly contain two measurement approach: 1) damped method: according to the change of energy magnitude; 2) phase-shift method: according to the change of vibration phase shift.
System selected frequency is the microwave source of 1GHz-30GHz.Isolator energy absorbing load does not mate caused reflection, ensures that signal source stably works.Attenuator attenuates amount regulates as required, and electromagnetic horn gain is 10-20dB.Low noise amplifier is used for amplifying through the microwave signal be attenuated after medium.Detecting way is phase sensitive detection, and error voltage had both reflected the phase-shift phase through microwave signal after medium.
Parameter measurement uses pairing comparision.During reference value of writing music, first do not place coal, read datum.And then place coal, read microwave value, cut datum and obtain measured value.Because coal is then non-uniform granular, the granularmetric composition dispersiveness of coal is very large, particle shape dispersiveness is also very large, and has two aspect factors affect measuring accuracy a granularmetric composition dispersiveness to make greatly in each measurement its granularity (granularity at different levels occupy measurement space than different) will cause the increase of measurement medial error like this.B particle shape is dispersed large, and the particle that shape varies, mainly larger particle can arrange out complicated excessive or different slot, thus increases error.Amplitude and phase place two kinds of parameters are adopted to offset the impact of density and granularity for above 2 the utility model.
Principle of work of the present utility model is:
One, microwave signal source produces the microwave signal of 1GHz-30GHz, and this microwave signal is divided into two parts, and a part irradiates coal by emitting antenna; Another part is coupled out by coupling mechanism and divides with microwave local oscillator merit the signal of output through becoming intermediate-freuqncy signal with reference to after frequency converter process, enters after intermediate frequency amplifier A amplifies and delivers to signal processor;
Two, after low noise amplifier amplifies, divide the signal of output through accept passage frequency-conversion processing after to become intermediate-freuqncy signal with microwave local oscillator merit transmitted through the microwave signal of coal by receiving antenna pickup, enter after intermediate frequency amplifier B amplifies and deliver to signal processor;
Three, signal processor carries out phase place and amplitude calculating respectively to the reference signal exported from intermediate frequency amplifier A and from the signal after the microwave signal transmission coal of intermediate frequency amplifier B, carry out the detection of amplitude difference and phase differential, obtain the microwave parameters characterizing moisture; The mathematical model that this microwave parameters is set up by actual experiment and density compensation algorithm carry out computing, obtain water content detection result; This water content detection result is transferred to terminating machine by data output device.
The utility model also has other various embodiments, can be applicable to the online water content detection in the industrial and agricultural productions such as grain, tobacco, chemical industry.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 claim appended by this patent.
Claims (2)
1. the online Coal ' moisture measuring system of microwave method, it is characterized in that, include directional coupler, one end of directional coupler is connected with isolator by attenuator, and isolator is connected with microwave signal source; The other end of directional coupler is connected with reference to frequency converter; Be connected with power splitter, intermediate frequency amplifier A respectively with reference to frequency converter; Power splitter is connected with microwave local oscillator, receiving cable frequency converter; Intermediate frequency amplifier A is connected with signal processor; Signal processor is connected with receiving cable frequency converter by intermediate frequency amplifier B; Signal processor is connected with terminating machine by data output device; Receiving cable frequency converter is connected with low acoustic amplifier; Directional coupler is connected with emitting antenna; Low acoustic amplifier is connected with receiving antenna.
2. the online Coal ' moisture measuring system of microwave method according to claim 1, is characterized in that, the microwave frequency of described microwave signal source is 1GHz-40GHz.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201520036463.3U CN204374103U (en) | 2015-01-20 | 2015-01-20 | The online Coal ' moisture measuring system of microwave method |
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| CN201520036463.3U CN204374103U (en) | 2015-01-20 | 2015-01-20 | The online Coal ' moisture measuring system of microwave method |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105203562A (en) * | 2015-08-31 | 2015-12-30 | 中国舰船研究设计中心 | Testing system for insertion phase delay of frequency selection material and testing method thereof |
| CN105403577A (en) * | 2015-12-07 | 2016-03-16 | 华南农业大学 | Fruit tree root liquid fertilizer infiltration measurement system |
| CN106771712A (en) * | 2016-11-15 | 2017-05-31 | 中国电子科技集团公司第四十研究所 | A kind of frequency converter phase conformance testing device and 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 |
| CN112113981A (en) * | 2020-09-18 | 2020-12-22 | 武汉理工大学 | Device and method for online and rapid detection of fine aggregate moisture content |
| CN114199900A (en) * | 2021-12-14 | 2022-03-18 | 西安石油大学 | Crude oil water content measuring device based on Vivaldi antenna |
| CN114354654A (en) * | 2022-01-07 | 2022-04-15 | 中国矿业大学 | DW-KNN-based rapid nondestructive detection method for coal moisture content |
| CN115575417A (en) * | 2022-08-03 | 2023-01-06 | 华能应城热电有限责任公司 | Coal moisture detection method and device |
-
2015
- 2015-01-20 CN CN201520036463.3U patent/CN204374103U/en active Active
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105203562A (en) * | 2015-08-31 | 2015-12-30 | 中国舰船研究设计中心 | Testing system for insertion phase delay of frequency selection material and testing method thereof |
| CN105403577A (en) * | 2015-12-07 | 2016-03-16 | 华南农业大学 | Fruit tree root liquid fertilizer infiltration measurement system |
| CN105403577B (en) * | 2015-12-07 | 2018-01-30 | 华南农业大学 | A kind of fruit tree root liquid fertilizer infiltrates measuring system |
| CN106771712A (en) * | 2016-11-15 | 2017-05-31 | 中国电子科技集团公司第四十研究所 | A kind of frequency converter phase conformance testing device and method |
| CN106771712B (en) * | 2016-11-15 | 2019-07-26 | 中国电子科技集团公司第四十一研究所 | A kind of frequency converter phase conformance testing device and 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 |
| CN112113981A (en) * | 2020-09-18 | 2020-12-22 | 武汉理工大学 | Device and method for online and rapid detection of fine aggregate moisture content |
| CN114199900A (en) * | 2021-12-14 | 2022-03-18 | 西安石油大学 | Crude oil water content measuring device based on Vivaldi antenna |
| CN114354654A (en) * | 2022-01-07 | 2022-04-15 | 中国矿业大学 | DW-KNN-based rapid nondestructive detection method for coal moisture content |
| CN115575417A (en) * | 2022-08-03 | 2023-01-06 | 华能应城热电有限责任公司 | Coal moisture detection method and device |
| CN115575417B (en) * | 2022-08-03 | 2023-10-31 | 华能应城热电有限责任公司 | Coal moisture detection method and device |
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