CN104730088A - Fly ash carbon content monitor - Google Patents

Fly ash carbon content monitor Download PDF

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Publication number
CN104730088A
CN104730088A CN201510102938.9A CN201510102938A CN104730088A CN 104730088 A CN104730088 A CN 104730088A CN 201510102938 A CN201510102938 A CN 201510102938A CN 104730088 A CN104730088 A CN 104730088A
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CN
China
Prior art keywords
microwave
sample
described
signal
flue dust
Prior art date
Application number
CN201510102938.9A
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Chinese (zh)
Inventor
徐慧
Original Assignee
格林奔科(北京)贸易有限公司
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Priority to CN201510102938.9A priority Critical patent/CN104730088A/en
Publication of CN104730088A publication Critical patent/CN104730088A/en

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Abstract

The invention provides a fly ash carbon content monitor. The fly ash carbon content monitor is characterized in that a microwave signal transmitted by a first microwave transmitter passes through a sample; a first microwave signal receiver receives the microwave signal passing through the sample; the first microwave transmitter and the first microwave signal receiver are fixed at the two ends of a microwave guide device; a sample cavity for containing the sample is formed in the microwave guide device; a signal comparator can be used for measuring the attenuation change from the microwave signal transmitted by the first microwave transmitter to the microwave signal received by the first microwave signal receiver; one path of the microwave signal is generated by a second microwave transmitter and passes through the sample, and the other path of the microwave signal does not pass through the sample and is used as a reference signal; a microwave phase discriminator receives and determines the phase change of the microwave signal which is transmitted by the second microwave transmitter and passes through the sample and the reference signal which is transmitted by the second microwave transmitter and does not pass through the sample; a fly ash carbon content calculator is connected with the signal comparator and the microwave phase discriminator; and the fly ash carbon content calculator is used for calculating the content of fly ash carbon of the sample according to the microwave attenuation change of the measurement of the signal comparator and the phase change of the measurement of the microwave phase discriminator.

Description

Unburned carbon in flue dust monitor

Technical field

The present invention relates to a kind of monitoring instrument, specifically, relate to a kind of unburned carbon in flue dust monitor.

Background technology

Boiler flyash carbon content is the important indicator of reflection coal-fired boiler in thermal power plant burning efficiency, detects unburned carbon in flue dust in real time and will be conducive to instructing operation Correctly adjust coal-air ratio, improve boiler combustion level of control; The index of conservative control unburned carbon in flue dust, is conducive to reducing coal consumption and cost of electricity-generating, improves the economy of unit operation, also contribute to power plant management People Analysis boiler combustion efficiency, improve the safe operation of pulverized coal preparation system and supply air system.

Existing unburned carbon in flue dust monitor is measured based on a kind of measuring principle mostly, such as, based on microwave attenuation, microwave resonance method or calcination loss method; First two method is subject to the impact of ash sample quantity, and microwave monitoring unburned carbon in flue dust can only provide a relative linear relationship usually, the absolute value of carbon content then needs by manually carrying out chemical analysis to same flying dust sample, microwave detection equipment is demarcated, so just can measure the absolute value of unburned carbon in flue dust.Once coal changes, the density of flying dust changes, then need again to demarcate, otherwise the accuracy of impact monitoring.The execution unit of calcination loss method is complicated, and sampling spot position is selected to affect accuracy, if position is selected bad, not only samples difficulty, and can produce comparatively big error.

In addition, adopt the sampling spot of the unburned carbon in flue dust monitor of above-mentioned three kinds of measuring methods to be generally arranged on air preheater rear end, this position temperature is lower, easily occurs the problem that sampling line blocks during sampling.Therefore, a kind of new unburned carbon in flue dust monitor is needed.

Summary of the invention

The object of the present invention is to provide a kind of unburned carbon in flue dust monitor, measurement data precision is high, and do not need again to demarcate when changing coal, sampling spot is positioned at air preheater front end, avoids sampling line blocking occurs.

For achieving the above object, the invention provides a kind of unburned carbon in flue dust monitor, it comprises: the first microwave emitter, described first microwave emitter launched microwave signal, and microwave signal is through sample; First microwave receiver, described first microwave receiver receives that described microwave emitter is launched and through the microwave signal of sample; Microwave director, described microwave director two ends fix described first microwave emitter and the first microwave receiver respectively, are provided with sample cavity in described microwave director, splendid attire sample in described sample cavity; Signal comparator, described signal comparator measure microwave signal that described first microwave emitter launches to the first microwave receiver receive and the attenuation change of microwave signal through sample; Second microwave emitter, described second microwave emitter launches two way microwave signals, a road microwave signal through sample, a road microwave signal without sample as with reference to signal; Microwave phase discriminator, described microwave phase discriminator receives and measures the microwave signal through sample that described second microwave emitter launches and changes with the phase place of the reference signal without sample; Unburned carbon in flue dust counter, described unburned carbon in flue dust counter is connected with described signal comparator and described microwave phase discriminator, and described unburned carbon in flue dust counter goes out the unburned carbon in flue dust of sample according to the phase place change calculations that microwave attenuation changes and described microwave phase discriminator is measured that described signal comparator is measured.

Preferably, the entrance point of the sample cavity of described microwave director and the endpiece pipeline communication of cyclone, the air in sample is discharged by described cyclone.

Preferably, the endpiece of described cyclone is neighbouring connects Vib..

Preferably, described cyclone is communicated with thrower pipeline and sampler pipeline.

Preferably, described sampler pipeline is provided with heat insulation layer.

In addition, preferably, the entrance point of described sample cavity is communicated with compressor reducer, and described compressor reducer improves the packing ratio of sample in described sample cavity by compression sample.

From above-mentioned description with put into practice, compared with prior art, its beneficial effect is unburned carbon in flue dust monitor provided by the invention: first, in sampling process, repeatedly compresses sample, improves packing ratio, reduces measuring error; And sampling spot is positioned at air preheater front end, sampling pipe is provided with heat insulation layer, can avoid the too fast condensation bonding caused of temperature decline rate, avoid affecting normal measurement process because of sampling line blocking, decrease maintenance cost and time.Secondly, adopt two kinds of independently microwave measurement modes, measure attenuation change and the phase place change of microwave, carbon content and grey total amount in flying dust is obtained by unburned carbon in flue dust counter, calculated the unburned carbon in flue dust of sample again by unburned carbon in flue dust counter, i.e. the number percent of grey total amount shared by carbon content, measurement data precision is high, thus avoid repeatedly duplicate measurements, decrease Measuring Time and capacity utilization; And the change of microwave phase can the density of flying dust of sampling, thus judge coal belonging to sample, and do not need again to demarcate when changing coal, a large amount of decreases cost of labor and capacity utilization.

Accompanying drawing explanation

By below in conjunction with the description of accompanying drawing to embodiment, above-mentioned characteristic sum technological merit of the present invention will become apparent and easy understand.In the accompanying drawings,

Fig. 1 is the schematic diagram of the unburned carbon in flue dust monitor described in one embodiment of the invention;

Fig. 2 is the schematic diagram of the decay of the two-way microwave of the unburned carbon in flue dust monitor monitoring shown in Fig. 1;

Fig. 3 is the schematic diagram of the phase shift of the two-way microwave of the unburned carbon in flue dust monitor monitoring shown in Fig. 1.

Reference numeral:

1: the first microwave emitter; 2: the first microwave receivers; 3: microwave director; 31: sample cavity;

4: the second microwave emitters; 5: cyclone; 6: Vib..

Embodiment

For enabling above-mentioned purpose of the present invention, feature and advantage become apparent more, below in conjunction with the drawings and specific embodiments, the technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.

Fig. 1 is the schematic diagram of the unburned carbon in flue dust monitor described in one embodiment of the invention.As shown in Figure 1, unburned carbon in flue dust monitor comprises the first microwave emitter, the first microwave receiver, microwave director, signal comparator, the second microwave emitter and microwave phase discriminator.

First microwave emitter 1 launched microwave signal, a road microwave signal without sample, direct entering signal comparer, another road microwave signal through sample, and is decaying through sample; First microwave receiver 2 receive microwave emitter launch, through sample and occurred decay microwave signal.Sample is Fly ash sampling sample, coal dust not burned in flying dust sample is converted to graphite-like carbon, when first microwave emitter 1 launched microwave irradiates sample, decay because graphite-like carbon absorbs microwave, in flying dust, graphite concentration is higher, then absorb microwave action stronger, Amount of Decay of Microwaves is larger, the microwave amount that first microwave receiver 2 receives is fewer, and vice versa.

The first microwave emitter 1 and the first microwave receiver 2 is fixed at microwave director 3 two ends respectively, is provided with sample cavity, splendid attire sample in sample cavity in microwave director 3.The microwave that first microwave emitter 1 is launched is received by the first microwave receiver 2 after sample.

Signal comparator is for measuring and comparing the attenuation change of two way microwave signals, and signal comparator compares the attenuation change of the microwave signal that microwave signal that the first microwave emitter 1 launches receives to the first microwave receiver 2 for measuring; This attenuation change is the function of the carbon content of sample, can calculate the carbon content of sample.Microwave signal only can absorb by the carbon component in sample, and can not to be absorbed by other ash component of sample.Carbon content in the dough softening of microwave signal and sample cavity is relevant, and carbon content is more, and microwave signature attenuation degree is larger.The road microwave signal that first microwave emitter 1 is launched is initial microwave signal, another road microwave signal is after sample, the microwave signal that first microwave emitter 1 is launched is absorbed by the carbon component in sample and decays, the microwave signal that first microwave receiver 2 receives is the residue microwave signal after decay, signal comparator can obtain initial microwave signal and the difference remaining microwave signal, the microwave signal value absorbed by carbon component when being namely through sample, also be the attenuation change value of microwave, the carbon content in sample can be calculated.

Second microwave emitter 4 launches two way microwave signals, and a road microwave signal, through sample, phase shift can occur by the microwave signal of sample, and a road microwave signal is directly sent to microwave phase discriminator without sample, and this road signal is as reference signal; Above-mentioned two paths of signals is all received by microwave phase discriminator, thus the phase place obtaining the reference signal of microwave without sample and the microwave signal through sample changes, and the change of phase place is the function of the grey total amount of sample, can calculate the grey total amount of sample.The change of microwave phase is reciprocity with the density of sample, and the grey total amount in sample cavity is larger, then the change of phase place is larger, and namely phase shift is larger.

Fig. 2 is the schematic diagram of the decay of the two-way microwave of the unburned carbon in flue dust monitor monitoring shown in Fig. 1.As shown in Figure 2, L1 represents the initial microwave signal without sample cavity, directly entering signal comparer, L2 represent through sample, to be absorbed by the carbon component in sample and after decay, to enter the residue microwave signal of signal comparator.And the sensing of arrow between L1 and L2 and two peak-to-peak distances of ripples represent after sample, the attenuation change of microwave.Because flying dust is to the absorption of microwave in sample cavity, microwave signal decays to some extent, and the carbon content of sample is larger, and the attenuation change of microwave is larger.

Fig. 3 is the schematic diagram of the phase shift of the two-way microwave of the unburned carbon in flue dust monitor monitoring shown in Fig. 1.As shown in Figure 3, L3 represents without sample cavity, the reference signal directly entering microwave phase discriminator, L4 represent through sample and microwave generation phase shift laggard enter the microwave signal of microwave phase discriminator.And the distance between the sensing of arrow between L3 and L4 and two curves represents after sample, the phase place change of microwave.Because flying dust is to the absorption of microwave in sample cavity, phase place slows down, and the grey total amount of sample is larger, and the phase place change of microwave greatly.

Unburned carbon in flue dust counter is connected with signal comparator and microwave phase discriminator, the microwave attenuation change calculations that unburned carbon in flue dust counter can be measured according to signal comparator goes out the carbon content of sample, the phase place change calculations that unburned carbon in flue dust counter can also be measured according to microwave phase discriminator goes out the grey total amount of sample, and unburned carbon in flue dust counter can obtain unburned carbon in flue dust further according to carbon content and grey total amount; Relative to single-measurement Microwave attenuation measurement in prior art, can only carbon content in judgement sample, once coal is changed, if do not re-start demarcation, then cannot measure grey total amount, also just cannot obtain unburned carbon in flue dust.When single coal, this problem can be solved by demarcating.But precision can be caused under coal becomes situation to decline.By measuring microwave phase, we directly can measure the ash quantity in sample, thus calculate unburned carbon in flue dust accurately, and no matter which kind of coal sample is in.Two kinds of modes can correct mutually, to increase the data precision and measuring accuracy.

The entrance point of the sample cavity 31 of microwave director 3 and the endpiece pipeline communication of cyclone 5, the top of cyclone 5 is communicated with thrower pipeline 51 and sampler pipeline 52, wherein, sampler pipeline 52 is provided with heat insulation layer, the sampling spot of unburned carbon in flue dust monitor can be arranged on the front end of air preheater, this end temperature is greater than 300 DEG C, guarantee that flying dust can enter into cyclone 5 glibly, air preheater rear end is positioned at relative to sampling spot, Yin Wendu can be avoided to decline fast and cause flue-gas temperature lower than condensation point, because condensation bonding causes line clogging, the normal use of impact analysis instrument.

When sampling, flying dust enters in cyclone 5, and the air in sample is discharged by cyclone 5, leaves flying dust.Connect Vib. 6 near the endpiece of cyclone 5, by the effect of vibration of Vib. 6, flying dust falls in the sample cavity 31 of microwave director 3 from cyclone 5.

The entrance point of sample cavity 31 is communicated with compressor reducer, the pressurized air of being discharged by compressor reducer is exerted pressure downwards from the top of sample, to reduce the gap between the sample particle in sample cavity 31, and flying dust can be reduced to rebound out microwave director, improve packing ratio and also reduce measuring error.Vib. 6 interval action, sample can fall compartment of terrain, often falls once, starts first compression device, and reduce the gap between sample particle, until sample cavity 31 is fully filled, sampling process terminates.And then open the first microwave emitter and the second microwave emitter is measured, signal comparator and microwave phase discriminator can measure attenuation change and the phase place change of microwave simultaneously, are then obtained the carbon content of flying dust by unburned carbon in flue dust counter.

After coal is changed, the maximum differential of the sample of extraction is exactly that grey matter is different with ash content.If only adopt Microwave attenuation measurement mode, then can only measure the carbon content of sample.And unburned carbon in flue dust is carbon content in sample occupies the number percent of all ash contents, carbon content is absolute value, and unburned carbon in flue dust is relative value, and unburned carbon in flue dust has directive significance for burning efficiency.Traditional single-measurement microwave attenuation is after coal varitation, because the ash content after changing coal cannot be measured, then ash content or first time the parameter determined of timing signal, so when ature of coal changes, if again do not monitored, cannot obtain ash content, the measurement precision of unburned carbon in flue dust is obviously affected.

And unburned carbon in flue dust monitor provided by the invention also comprises RF phase measurement unit, microwave phase is mainly used in measuring the ash content in sample cavity, carbon content and ash content can be measured so simultaneously, obtain unburned carbon in flue dust further, even if ature of coal changes, also can monitor the meeting becoming coal accordingly, also can not affect precision, so without the need to again demarcating when changing coal.

From above-mentioned description with put into practice, unburned carbon in flue dust monitor provided by the invention, first, in sampling process, repeatedly compresses sample, improves packing ratio, reduces measuring error; And sampling spot is positioned at air preheater front end, sampling pipe is provided with heat insulation layer, can avoid the too fast condensation bonding caused of temperature decline rate, avoid affecting normal measurement process because of sampling line blocking, decrease maintenance cost and time.Secondly, adopt two kinds of independently microwave measurement modes, measure attenuation change and the phase place change of microwave, carbon content and grey total amount in flying dust is obtained by unburned carbon in flue dust counter, calculated the unburned carbon in flue dust of sample again by unburned carbon in flue dust counter, i.e. the number percent of grey total amount shared by carbon content, measurement data precision is high, thus avoid repeatedly duplicate measurements, decrease Measuring Time and capacity utilization; And the change of microwave phase can the density of flying dust of sampling, thus judge coal belonging to sample, and do not need again to demarcate when changing coal, a large amount of decreases cost of labor and capacity utilization.

Above; be only the application's preferably embodiment, but the protection domain of the application is not limited thereto, any people being familiar with this technology is in the technical scope disclosed by the application; the change that can expect easily or replacement, within the protection domain that all should be encompassed in the application.Therefore, the protection domain of the application should be as the criterion with the protection domain of claim.

Claims (6)

1. a unburned carbon in flue dust monitor, is characterized in that, it comprises:
First microwave emitter, described first microwave emitter launched microwave signal, microwave signal is through sample;
First microwave receiver, described first microwave receiver receives that described microwave emitter is launched and through the microwave signal of sample;
Microwave director, described microwave director two ends fix described first microwave emitter and the first microwave receiver respectively, are provided with sample cavity in described microwave director, splendid attire sample in described sample cavity;
Signal comparator, described signal comparator measure microwave signal that described first microwave emitter launches to the first microwave receiver receive and the attenuation change of microwave signal through sample;
Second microwave emitter, described second microwave emitter launches two way microwave signals, a road microwave signal through sample, a road microwave signal without sample as with reference to signal;
Microwave phase discriminator, described microwave phase discriminator receives and measures the microwave signal through sample that described second microwave emitter launches and changes with the phase place of the reference signal without sample;
Unburned carbon in flue dust counter, described unburned carbon in flue dust counter is connected with described signal comparator and described microwave phase discriminator, and described unburned carbon in flue dust counter goes out the unburned carbon in flue dust of sample according to the phase place change calculations that microwave attenuation changes and described microwave phase discriminator is measured that described signal comparator is measured.
2. unburned carbon in flue dust monitor as claimed in claim 1, is characterized in that, the entrance point of the sample cavity of described microwave director and the endpiece pipeline communication of cyclone, and the air in sample is discharged by described cyclone.
3. unburned carbon in flue dust monitor as claimed in claim 1, is characterized in that, connects Vib. near the endpiece of described cyclone.
4. unburned carbon in flue dust monitor as claimed in claim 1, is characterized in that, described cyclone is communicated with thrower pipeline and sampler pipeline.
5. unburned carbon in flue dust monitor as claimed in claim 4, it is characterized in that, described sampler pipeline is provided with heat insulation layer.
6. unburned carbon in flue dust monitor as claimed in claim 1, is characterized in that, the entrance point of described sample cavity is communicated with compressor reducer, and described compressor reducer improves the packing ratio of sample in described sample cavity by compression sample.
CN201510102938.9A 2015-03-09 2015-03-09 Fly ash carbon content monitor CN104730088A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105115990A (en) * 2015-09-01 2015-12-02 解海龙 Sampling-free detection method applied to microwave carbon examination and carried out at dust outlet of dry collector

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