CN1595123A - Microwave carbon-detection sensor uninfluenced by change of coal type - Google Patents
Microwave carbon-detection sensor uninfluenced by change of coal type Download PDFInfo
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- CN1595123A CN1595123A CN 200410026275 CN200410026275A CN1595123A CN 1595123 A CN1595123 A CN 1595123A CN 200410026275 CN200410026275 CN 200410026275 CN 200410026275 A CN200410026275 A CN 200410026275A CN 1595123 A CN1595123 A CN 1595123A
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Abstract
This invention is a microwave carbon detecting sensor free of the influence of carbon kinds, which is located with a rectangle or column micro resonant chamber with an ash sample pipe vertical through the resonant chamber and with a co-axis cable socket in the resonant chamber inside end of which has a probe activator or couple ring activator the outside end is connected with a circulator. The first end of the circulator is connected with microwave signal generator and the second end of the circulator is connected with out end of the cable socket and the third end of the circulator is connected with the microwave cymoscope. It deduces measurement frequency and greatly deduces the power of absorbing the inorganic matter powder by the fly ash and eliminates the coal kinds influence. The resonant chamber is filled with low wear dielectric and can further reduce the size of resonant chamber.
Description
Technical field
The present invention relates to a kind of microwave measurement sensor that utilizes carbon content in the microwave measurement large scale industry boiler fly ash, specifically, it is a kind of microwave carbon-detecting sensor that is not subjected to the coal variable effect.
Background technology
In prior art, a kind of microwave carbon-detecting sensor is provided among U.S. Pat 5109201, the US5173662, it is to determine unburned carbon in flue dust with the size of measuring carbon granule absorption microwave power in the flying dust.Referring to the Fig. 3 among the US5173662, it mainly is made up of a waveguide 128, first, second waveguide coaxial converter 130,132 that is located at these waveguide two ends, the coaxial gating switch 226 of ash sample pipe 110, microwave generator 206, circulator 210, directional coupler 214, multichannel that is located at measurement waveguide middle part, gate logic controller 228, power meter 222 etc.The microwave of microwave generator output is delivered to directional coupler by circulator, directional coupler is according to the coupling output allocation proportion of setting, the microwave power PF of small scale output (below be weighed into penetrate power) is delivered to the coaxial gating switch of multichannel, the vast scale microwave power is sent in the measurement waveguide by first waveguide coaxial converter, this microwave is from an end of the measuring waveguide other end of walking, and by the output of second waveguide coaxial converter; The microwave energy of in measuring waveguide, walking, part energy is absorbed by the carbon granule in the ash sample pipe, the ash sample pipe is passed in part transmission, and remainder is reflected, and transmission part PT (to call transmission power in the following text) delivers to the coaxial gating switch of multichannel from the output of second waveguide coaxial converter; The reflecting part is back to directional coupler, directional coupler is delivered to the coaxial gating switch of multichannel according to the coupling export ratio of setting with small scale reflective power PR (to call reflective power in the following text) again, and the vast scale reflective power is continued to be back to circulator, transmission rule according to circulator, the microwave power that enters 2 ports will be sent to 3 ports, and the matched load that is arranged on 3 ports absorbs; Delivering to the incident, reflection of the coaxial gating switch of multichannel and three kinds of power of transmission is sent into power meter respectively through the control of gate logic controller and is measured, thereby draw the measured value of required incident power PF, reflective power PR and transmission power PT, deduct reflective power and transmission power with incident power, must go out carbon granule power absorbed in the ash sample pipe.Because during each the measurement, how many impossible unanimities of flying dust quantity in the ash sample pipe measuring section, so this patent also needs the pairing flying dust weight of each power measurement values is measured, remove power measurement values with gravimetric value and eliminate the inconsistent influence of weight power measurement values.
From above-mentioned measuring principle as can be seen, this patent need be measured the measured value that incident power, reflective power, transmission power and four variablees of flying dust weight just can provide unburned carbon in flue dust, and the variable of required measurement is too many, causes complex structure.Its reason has two, the one, the waveguide measurement pattern that it is set up is not ideal enough, this pattern be allow measure microwave entrained electromagnetic energy from the other end of walking of the end in the waveguide, and run into the ash sample pipe on the way, then according to energy conservation, the incident power that enters waveguide should equal reflective power and transmission power and flying dust carbon granule absorbed power sum, so, draw flying dust carbon granule power absorbed, must measure incident power, reflective power and three parameters of transmission power.Therefore, in order to realize this measurement, need establish two coaxial waveguide converters in the waveguide, and metering circuit has been selected devices such as directional coupler, the coaxial gating switch of multichannel and gate logic controller for use, complex structure is loaded down with trivial details, and especially the cost of directional coupler is also very expensive, also very uneconomical.The 2nd, it eliminates the inconsistent influence to power measurement values of weight with the method for check weighing, this is very unfavorable measure, not only to survey a variable more, and cause structure more complicated, the more important thing is that causing ash sample pipe bottom can not seal owing to will LOAD CELLS be set, therefore, just the mode that can not adopt ash sample pipe top and flue to be tightly connected is directly gathered ash sample, and can only adopt indirect acquisition mode, this is easy to cause the sampling time-delay and influences real-time.
Chinese patent 00240532 also provides a kind of microwave resonance cavity sensor, and it determines unburned carbon in flue dust with measuring resonator cavity quality factor q value.It mainly by one section rectangular cavity, first, second waveguide coaxial converter that is located at two ends, the humorous chamber of rectangle, the ash sample pipe that is located at rectangular cavity middle part, microwave sweep signal source (frequency range of frequency sweep be 1.55～5.20GHz) and signal processor etc. form.Wherein rectangular cavity is identical with the measurement waveguiding structure of above-mentioned United States Patent (USP).The microwave signal that microwave sweep signal source sends is sent into rectangular cavity by first waveguide coaxial converter, exports from second waveguide coaxial converter again; When the frequency of the microwave signal of sending into rectangular cavity when 1.55～5.20GHz changes, can obtain a tuning curve at output terminal, by measuring the resonance frequency f of this tuning curve with frequency change
0, resonance peak and resonant pulses middle part width equivalence can calculate the quality factor q value of resonator cavity, this Q value and unburned carbon in flue dust have S-curve relation (Chinese patent 94112176 shown in Figure 6 curve), according to this S-curve, after learning the Q value, can correspondence draw unburned carbon in flue dust.
Method with frequency sweep is measured, at first a necessary condition is to keep constant by microwave power in whole frequency sweep frequency range interior resonance chamber, could guarantee that so resulting curve is undistorted, but because the swept frequency range broad of this patent, be difficult in and all realize the probe of waveguide coaxial converter and the impedance matching of wiping the chamber that shakes on each frequency in the frequency sweep frequency range, because mismatch and microwave reflection, microwave power in whole frequency sweep frequency range interior resonance chamber is difficult to keep constant, therefore, resulting measurement curve is distortion, and accuracy is had a strong impact on.Moreover second necessary condition is that resonator cavity will have higher Q value, because the Q value is high more, corresponding tuning curve is narrow more height just, and its resolution is just high more, otherwise tuning curve is short more wide, and its resolution is low more, when short wide to a certain degree, just can't differentiate; Again because Q value and carbon content are the S-curve relation, thus when carbon content high to approaching or during above the ultimate value of this S-curve, because of the Q value low or be zero, can't differentiate, therefore, its measurement upper limit is restricted, general carbon content is approaching or surpass 15%, just can't measure.
There is the load of resonator cavity also can influence the Q value again, load is big more, the Q value is low more, except the probe of waveguide coaxial converter be dead load immutable, the ash sample pipe also is load, in order not reduce the Q value, must limit the size of ash sample pipe caliber, make the load of ash sample pipe the smaller the better, it is 8mm that this patent is selected maximum interior caliber for use, minimum have only 4mm, and thin like this pipe is easy to cause stifled ash, and what add its usefulness is to blow ash discharge in ash sample pipe bottom on pressurized air, just cause stifled ash easily, because pressurized air often has moisture, be easy to make flying dust to adhere to tube wall, adhesion layer progressive additive and form stifled ash.
As if this Chinese patent is on structure, and its metering circuit is much simpler than aforesaid United States Patent (USP), but it is still very complicated to measure the operational software of Q value, adds above-mentioned two technical matterss and is difficult to be resolved, and makes it can't practical application.
The document of similarity measure Q value also has Chinese patent 94112176, and it uses potentiometer frequency modulation, makes a cylindrical cavity resonance, obtains tuning curve with wave detector again, and its resonant frequency range that adopts is 8.5～10GHz.
All not mentioned coal changes to having a strong impact on that the microwave remote sensor carbon determination brings in above-mentioned three patents, and in existing document, also not seeing has close report.But measuring practice shows, when the coal of boiler combustion changes, can cause great measuring error, even surpass several times of unburned carbon in flue dust, so that the complete mistake of measurement data, can not use, this is the major reason that the online carbon determination of microwave current system can not widespread use.
In sum, also the someone mentions that coal changes to having a strong impact on that the microwave remote sensor carbon determination brings in prior art, and simultaneously, existing microwave carbon-detecting sensor is not the hardware configuration complexity, be exactly the computed in software complexity, and exist problems such as stifled ash, real-time difference and measurement range be limited.
Summary of the invention
The objective of the invention is at the problem in the prior art, at first solving coal changes to having a strong impact on that microwave remote sensor brings, a kind of microwave carbon-detecting sensor that is not subjected to the coal variable effect is provided, simultaneously, set up a kind of simple measurement pattern, make this sensor construction simple, calculate simply, and overcome stifled ash, real-time difference and the limited shortcoming of measurement range of prior art.
For achieving the above object, solution of the present invention is as follows:
Change to having a strong impact on that microwave remote sensor brings in order to solve coal, the present invention at first analyzes the contained composition of boiler fly ash, comprises two kinds of compositions in the boiler fly ash, and a kind of is the graphite granule that absorbs microwave energy, be also referred to as carbon granule, another kind is the inorganic mineral powder.Wherein the quantity that accounts for of carbon granule is less, and the quantity that the inorganic mineral powder accounts for is bigger.The inorganic mineral powder is non-conductive, is called dielectric, it is generally acknowledged that it also is not absorb microwave energy.In fact, this is a kind of understanding mistaken ideas, these dielectrics also can consume microwave energy, because these dielectrics are under effect of electric field, division can take place and form dipole in the electric charge of its molecule, when the microwave electric field alternation, dipole just produces vibration, polarization loss takes place, thereby consumed microwave energy, also just formed microwave energy partially absorbed this partially absorbing in the measuring-signal that can be added to, make and actually contain carbon value and detected value differs greatly, produce serious measuring error, and the inorganic mineral powder is also different according to the size that the difference of coal consumes microwave energy, thereby the measuring error that causes changes along with the variation of coal also, can't measure correction, cause measurement to carry out.According to Theory of Electromagnetic Field, we can obtain the formula that inorganic mineral powder (dielectric) absorbs microwave electromagnetic field power, that is:
ε in the formula
SBe dielectric static dielectric, ε
∞Be the specific inductive capacity of dielectric when microwave frequency is ∞, ω=2 π f are angular frequencies of microwave signal, and τ is dielectric relaxation time, and E is the electric field intensity of microwave, and V is the dielectric volume that is subjected to microwave irradiation.We see from this formula, and the inorganic mineral powder absorbs the power P d of microwave and square ω of microwave signal angular frequency
2Be directly proportional, illustrate that the frequency f of measurement microwave and the size that the inorganic mineral powder absorbs microwave power Pd have vital relation, that is to say, if reduce the frequency f of measuring microwave, its Pd value high attenuation greatly.
According to above-mentioned analysis, the present invention tests, experiment shows, in the time of in survey frequency is reduced to 0.3～1.5GHz scope, then the Pd value can reduce greatly, the microwave power that the inorganic mineral powder is absorbed is attenuated to insignificant, if greater than 1.5GHz, just is difficult to reach even can not reach this effect fully.Simultaneously, after microwave frequency reduced, because kelvin effect weakens, the resistivity of dag reduced, and the electric current of inducting increases, and the microwave power that dag absorbs strengthens, and therefore, reduces the carbon determination sensitivity that microwave frequency can also improve sensor.Therefore, the survey frequency scope selected for use of the present invention is that the frequency range of microwave generator output is 0.3～1.5GHz.
Concrete structure of the present invention is as follows:
It comprises microwave generator, circulator, microwave cavity, be located at ash sample pipe and microwave detector on the microwave cavity, its special character is: described microwave cavity or the rectangular cavity or the cylindrical cavity of a globality, described ash sample pipe vertically passes from the E face of rectangle microwave resonator cavity or the nose circle face of cylindrical microwave resonator cavity, and be fixed on the cavity, a concentric cable seat is housed on described microwave cavity, be connected to a probe excitation device or a coupling ring driver that gos deep in the resonator cavity in the inner of this concentric cable seat, 2. the port of the outer end of this concentric cable seat and circulator links, 1. the port of described circulator joins by cable and described microwave signal generator, and the 3. port of described circulator joins by cable and described microwave detector.
Be filled with low consumption dielectric in the above-mentioned microwave cavity.
Between the 3. port of above-mentioned circulator and described microwave detector, be connected to an isolator.
Be provided with a grey level sensor on the top of above-mentioned ash sample pipe or respectively be provided with a grey level sensor in the upper and lower of ash sample pipe.
Above-mentioned rectangle microwave resonator cavity adopts TE
101The type mode of oscillation.
Above-mentioned cylindrical microwave resonator cavity adopts E
010Mode of oscillation.
By above-mentioned solution as can be seen, the present invention has found out first that coal changes and the reason that causes measuring error, proposed to eliminate the measure of this error with the reduction frequency, this is that prior art is subjected to the unused microwave low frequency measurement frequency range of understanding limitation, and this measure has reached Expected Results.For simplified measurement, the present invention has set up the measurement resonator cavity of a microwave stationary field, this resonator cavity is not when adding the ash sample pipe, incident power equals reflective power, the present invention utilizes circulator again dexterously, earlier the incident power of microwave generator output is sent into resonator cavity from the probe excitation device, the reflective power that to export is thus delivered to wave detector again, if the ash sample pipe is set in this resonator cavity, part in its reflective power can be absorbed by carbon granule in the flying dust, and then the incident power of microwave generator output deducts the reflective power that is input to wave detector and just draws the carbon granule power absorbed.Find out thus, the present invention has not only avoided measuring the complex calculation of Q value and the limited problem of bringing thus of the measurement upper limit, simultaneously, has also lacked a measurand than United States Patent (USP), promptly need not measure transmission power, make structure of the present invention and measurement calculate all very simple.The present invention's mode that grey level sensor is set, the ash amount that makes ash sample pipe measuring section is full of all the time and keeps a constant basis, thereby avoid measuring ash sample weight, making ash sample pipe top directly and get grey device joins, not only guaranteed the real-time that flying dust is measured, also saved a measurand simultaneously, made measurements and calculations more simple than above-mentioned United States Patent (USP).Because the Q value of measurement of the present invention and resonator cavity has nothing to do, so broken away from ash sample pipe size and measured the related of sensitivity, can select thicker ash sample pipe, thereby eliminate one of factor of easily blocking up ash again.If the present invention adopts the lowest resonance pattern of resonator cavity, that is to say the stationary field of in resonator cavity, only setting up a node, its resonator cavity volume can be accomplished minimum, if again the ash sample pipe is arranged on the centre of resonator cavity, be the strongest part of stationary field, also can improve the measurement sensitivity of sensor.In resonator cavity, fill low consumption dielectric, can further reduce the size of resonator cavity, perhaps on original size, further reduce survey frequency.
Description of drawings
One of Fig. 1, rectangular cavity of the present invention and cylindrical humorous cavity configuration synoptic diagram.
The A-A sectional view of Fig. 2, Fig. 1.
One of Fig. 3, cylindrical cavity structural representation of the present invention (the A-A sectional view of Fig. 1).
Two of Fig. 4, rectangular cavity of the present invention and cylindrical humorous cavity configuration synoptic diagram.
The B-B sectional view of Fig. 5, Fig. 4.
Two (the B-B sectional views of Fig. 4) of Fig. 6, cylindrical cavity structural representation of the present invention.
The connecting structure synoptic diagram of Fig. 7, circulator and probe excitation device.
The syndeton synoptic diagram of Fig. 8, ash sample pipe branch road of the present invention.
Embodiment
Describe structure of the present invention and principle of work in detail according to embodiment below.
Referring to Fig. 1,2,7, piece number 1 is described rectangular cavity, this rectangular cavity can be made of one section rectangular waveguide of closed at both ends, at the vertically interspersed ash sample pipe 2 of this rectangular cavity E face (wide face), this ash sample pipe by cover thereon, the metallic sheath 3 at following two ends, 4 are fixed on the resonator cavity 1, wherein metallic sheath 3,4 also are equivalent to by circular waveguide, they can prevent that the microwave in the resonator cavity from making progress along the ash sample pipe, following both direction leaks, described ash sample pipe is general to adopt transparent quartz glass tube, and is that the strongest position of stationary field is the best to intert in E face central authorities.A described concentric cable seat 5 also is housed on the E of this rectangular cavity face, and be advisable to be installed on the E face axis, go deep into probe excitation device 6 in the resonator cavity one of the lower end of concentric cable seat 5 spiral marking connection, be connected to circulator 7 in the upper end of concentric cable seat 5,1. the port and the described microwave generator 8 of this circulator 7 join, its 2. port be screwed in by hand rotary nut on the last end interface of concentric cable seat 5, its 3. port join by isolator 9 and described wave detector 10.The signal of circulator 7 transmits rule: be transferred into 2. port output from the 1. signal of port input circulator, and be transferred into 3. port output from the 2. signal of port input circulator, be sent to 1. port output from the 3. signal of port input circulator.The measuring principle of this sensor is: the tested flying dust that ash sample pipe 2 is gathered from fly ash sampler, and be full of the ash sample pipe; The microwave measurement signal of microwave generator 8 outputs is delivered to the 1. port of circulator 7 by cable, circulator 7 transmits rule according to it this signal is sent to 2. port, and give probe excitation device 6 by concentric cable seat 5, thereby set up stationary field in the space in resonator cavity 1, the microwave power that enters in the resonator cavity is removed by outside the carbon granule power absorbed in the ash sample pipe, all the other power all reflect to probe excitation device 6, this reflective power is delivered to the 2. port of circulator again by 5 outputs of concentric cable seat, circulator reaches 3. port output according to its microwave power that transmits regular 2. port input again, and deliver to isolator 9 by cable, isolator 9 is delivered to wave detector 10 by cable again, is exported by wave detector.Wherein isolator 9 has unidirectional waveguiding action, and it is used to prevent that the reflection wave of wave detector input end is back to microwave generator, so that destroys the stability of microwave generator.
Referring to Fig. 8, it is that 25mm and internal diameter are the quartz glass tube of 22mm that this routine ash sample pipe 2 is selected external diameter for use, the top of this ash sample pipe is connected to a fly ash sampler, this sampler is an angle receiving hopper 15 that vertically gos deep into flue 26, flue gas stream passes from flue along the direction of arrow, when flying dust is wherein run into the angle of receiving hopper upper end, promptly fall along receiving hopper; A Vib. 22 that prevents flying dust adhesion tube wall is housed in the outside, lower end of this receiving hopper, this receiving hopper lower end connects a heating pipeline section 16 that is used for dry flying dust by ring flange, at this heating pipeline section overcoat a solenoid electric heater 17 is arranged, the lower end of this heating pipeline section joins by the upper end of resilient seal pipe 18 with ash sample pipe 2, ash sample pipe lower end connects an envelope ash pipe 19 by ring flange, a lever type ash ejector 20 and a tube wall Vib. 21 by Electromagnetic Drive is equipped with in lower end at the envelope ash pipe, is provided with an ash accepting machine 25 below the envelope ash pipe; Described upper and lower grey level sensor 23,24 is installed on the metallic sheath 3,4, the ash level sensor can adopt a light emitting diode and a photosensitive receiving tube, when rising and when blocking light emitting diode in the grey level sensor 23 in the ash position in the ash sample pipe, photosensitive receiving tube does not receive signal, then receiving circuit provides zero level or high level useful signal, then measure controller control earlier from the wave detector once sampling, control ash ejector 20 beginning ash discharges again, then the ash position begins to descend, and the signal of current sampling is a reflective power; When ash position descends when surpassing down grey level sensor 24, following useful signal of the also corresponding output of grey level sensor 24, then measure controller and control once sampling again, and then control stops ash discharge, the signal of current sampling is an incident power, deduct the measurement that reflective power is promptly finished a point with incident power, so the measurement that continues its carbon content each point is in time finished in circulation.If microwave generator is a very stable constant power source, also can save and measure this step of incident power, promptly only be provided with one and go up grey level sensor 23, when the ash position was risen above sensor 23, then sensor provided a useful signal, then controller elder generation control once sampling, control ash discharge again, ash position begins to descend, and what sampling was measured is reflective power, deducts the measurement that this sampled value is promptly finished a point with the output valve of constant power source; When the ash position descends above sensor 23, export a useful signal again, then control stops ash discharge, and so the measurement of each point is finished in circulation.
Referring to Fig. 1, in described rectangular cavity, can fill low-loss dielectric 13 again, as: teflon, tygon, polystyrene, mica, high-frequency ceramic, quartz etc., their DIELECTRIC CONSTANT
γAll greater than the specific inductive capacity 1 of air or vacuum, according to following formula 1., DIELECTRIC CONSTANT
γBig more, the size of resonator cavity is more little, perhaps utilizes filling dielectric further to reduce survey frequency again on former resonant cavity size basis of invariable.
Accomplish minimum for the volume that makes this rectangular cavity 1, this resonator cavity can adopt TE
101The type mode of oscillation." Theory of Electromagnetic Field basis " book of publishing according to the Electronic Industry Press, but same resonator cavity resonance in unlimited a plurality of resonance frequencies, the pattern that resonance wavelength is the longest is called the lowest resonance pattern in chamber, in rectangular cavity, the lowest resonance pattern is TE
101The type mode of oscillation that is to say, only sets up the stationary field of a node in this resonator cavity, makes the inner chamber length L of resonator cavity equal waveguide wavelength half, its resonance wavelength
0Satisfy formula with the relation of cavity length L and E face width degree a:
E face width degree a satisfies:
H face height b satisfies:
λ in the formula
0Can determine ε according to the frequency of selected measurement microwave
γSpecific inductive capacity for the resonator cavity filling dielectric.
Referring to Fig. 3, the resonator cavity described in Fig. 1 also can adopt a cylindrical cavity 11, and other structure is identical with rectangular cavity.Remain to the volume that makes resonator cavity and accomplish minimum, cylindrical cavity adopts E
010Mode of oscillation, this mode of oscillation are the lowest resonance patterns of cylindrical cavity, its resonance wavelength
0Satisfy formula with the relation of resonator cavity inwall radius
λ in the formula
0Can determine ε according to the frequency of selected measurement microwave
γSpecific inductive capacity for the resonator cavity filling dielectric.Its principle of work is identical with Fig. 1.
Referring to Fig. 4,5, the probe excitation device among Fig. 1 also can replace with coupling ring driver 12, and this coupling ring driver is installed on the end plate of rectangular cavity.Its principle of work is identical with Fig. 1.
Referring to Fig. 6, the probe excitation device among Fig. 3 equally also can adopt coupling ring driver 12 to replace, and it is installed on the circumference plate of cylindrical cavity.Its principle of work is identical with Fig. 1.
Claims (7)
1, a kind of microwave carbon-detecting sensor that is not subjected to the coal variable effect, it comprises microwave generator (8), circulator (7), microwave cavity, is located at ash sample pipe (2) and microwave detector (10) on the microwave cavity, it is characterized in that:
1.1, the signal frequency of described microwave generator (8) is 0.3～1.5GHz;
1.2, described microwave cavity (1) or (11) are the rectangular cavity or the cylindrical cavities of a globality, described ash sample pipe (2) vertically passes from the E face of rectangle microwave resonator cavity or the nose circle face of cylindrical microwave resonator cavity, and be fixed on the cavity, in described microwave cavity (1), a concentric cable seat (5) is housed (11), be connected to a probe excitation device (6) or a coupling ring driver (12) that gos deep in the resonator cavity in the inner of this concentric cable seat, 2. the port of the outer end of this concentric cable seat and circulator (7) links, 1. the port of described circulator joins by cable and described microwave signal generator (8), and the 3. port of described circulator joins by cable and described microwave detector (10).
2, the microwave carbon-detecting sensor that is not subjected to the coal variable effect according to claim 1 is characterized in that: be filled with low consumption dielectric (13) in described microwave cavity (1) or (11).
3, the microwave carbon-detecting sensor that is not subjected to the coal variable effect according to claim 1 and 2 is characterized in that: be connected to an isolator (9) between the 3. port of described circulator (7) and described microwave detector (10).
4, the microwave carbon-detecting sensor that is not subjected to the coal variable effect according to claim 1 and 2 is characterized in that: be provided with a grey level sensor (23) on the top of described ash sample pipe (2) or respectively be provided with a grey level sensor (23), (24) in the upper and lower of ash sample pipe (2).
5, the microwave carbon-detecting sensor that is not subjected to the coal variable effect according to claim 3 is characterized in that: be provided with a grey level sensor (23) on the top of described ash sample pipe (2) or respectively be provided with a grey level sensor (23), (24) in ash sample pipe (2) upper and lower.
6, the microwave carbon-detecting sensor that is not subjected to the coal variable effect according to claim 5 is characterized in that: described rectangle microwave resonator cavity (1) adopts TE
101The type mode of oscillation.
7, the microwave carbon-detecting sensor that is not subjected to the coal variable effect according to claim 5 is characterized in that: described cylindrical microwave resonator cavity (11) adopts E
010Mode of oscillation.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2004100262759A CN100406875C (en) | 2003-10-20 | 2004-06-25 | Microwave carbon-detection sensor uninfluenced by change of coal type |
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| CN200320109663.4 | 2003-10-20 | ||
| CN200320109663 | 2003-10-20 | ||
| CN2004100262759A CN100406875C (en) | 2003-10-20 | 2004-06-25 | Microwave carbon-detection sensor uninfluenced by change of coal type |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104266734A (en) * | 2014-09-11 | 2015-01-07 | 长安大学 | Microwave weighing sensor and dynamic weighing method for vehicle |
| CN105784725A (en) * | 2016-04-22 | 2016-07-20 | 中北大学 | Device and method for extracting chemical parameters in harsh environment |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA1322222C (en) * | 1988-09-26 | 1993-09-14 | Nicholas George Cutmore | Determination of carbon in fly ash |
| JPH1038817A (en) * | 1996-07-23 | 1998-02-13 | Mitsubishi Heavy Ind Ltd | Measuring method for unburnt carbon quantity in fly ash and device therefor |
| CN2456159Y (en) * | 2000-10-08 | 2001-10-24 | 南京大陆中电科技股份有限公司 | Microwave resonance sensor for determining carbon content in flyash of boiler |
| CN2465180Y (en) * | 2001-02-21 | 2001-12-12 | 华东电力试验研究院科技开发公司 | Online microwave sensor for carbon content in fly ash of flue duct |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104266734A (en) * | 2014-09-11 | 2015-01-07 | 长安大学 | Microwave weighing sensor and dynamic weighing method for vehicle |
| CN105784725A (en) * | 2016-04-22 | 2016-07-20 | 中北大学 | Device and method for extracting chemical parameters in harsh environment |
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