CN103822857A - Online measurement method of fineness of boiler coal powder, apparatus thereof and inductive charge sensor - Google Patents
Online measurement method of fineness of boiler coal powder, apparatus thereof and inductive charge sensor Download PDFInfo
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- CN103822857A CN103822857A CN201410060806.XA CN201410060806A CN103822857A CN 103822857 A CN103822857 A CN 103822857A CN 201410060806 A CN201410060806 A CN 201410060806A CN 103822857 A CN103822857 A CN 103822857A
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Abstract
The invention relates to the boiler coal powder detection field, and especially relates to an online measurement method of the fineness of boiler coal powder, an apparatus thereof and an inductive charge sensor. The measurement method comprises the following steps: 1, utilizing a charge field generated by coal powder in a pipeline in real time to generate equivalent inductive charges; and 2, analyzing the equivalent inductive charges by adopting an AC charge induction and power density spectrum analysis method to obtain the fineness of the coal powder. The bumping and the friction of coal powder appear in the coal powder conveying process, so the coal powder has certain charges and generates a certain charge field, the charge field generated by the coal powder in the pipeline is utilized in real time to generate the equivalent inductive charges, and the equivalent inductive charges are analyzed by adopting the AC charge induction and power density spectrum analysis method to obtain the fineness of the coal powder. A real time acquisition effect is realized; and the inductive charges are only determined by the charge field, so measured data are not influenced by factors comprising the type of coal, the temperature, the ash content, the viscosity, the pressure, the flow velocity, the coal to air ratio and the like, and the data reliability is high.
Description
Technical field
The present invention relates to boiler coal-ash detection field, in particular to boiler coal-ash fineness On-line Measuring Method, device and induced charge sensor.
Background technology
For pulverized coal in power plant boiler, no matter be middle storage formula fuel pulverizing plant or blowing powder producing device, fineness of pulverized coal is the key factor that affects its economic security operation, particularly uses meager coal and anthracitic boiler, the impact of fineness of pulverized coal is even more important.
Due to the feature of this combustion system, as larger in fruit granule, coal dust is difficult to perfect combustion in the time leaving burner region, but later stage mixing is poor, makes burnout rate poor, unburned carbon in flue dust increases, boiler combustion efficiency reduces, shown in table 1 be fuel pulverizing plant test of certain power plant time real data, therefrom can find out the impact of fineness of pulverized coal on the imperfect combustion loss of lime-ash q4, and then affect boiler efficiency.The wearing and tearing that simultaneously inappropriate fineness of pulverized coal also easily causes high temperature corrosion and coking, reheater overtemperature tube burst, back-end surfaces are the series of problems such as stove chamber fire-extinguishing even.
Certain power plant's fineness of pulverized coal of table 1. and q4 relation
| Operating mode sequence number | Fineness 1 | |
|
| Fineness of pulverized coal % | 20.10 | 24.00 | 15.80 |
| Unburned combustible in fly ash % | 2.44 | 2.84 | 1.85 |
| Unburned combustible in slag % | 7.73 | 4.62 | 3.46 |
| Flying dust is imperfect combustion thermal loss % | 1.025 | 1.200 | 0.774 |
| Slag is imperfect combustion thermal loss % | 0.382 | 0.221 | 0.164 |
| Lime-ash is imperfect combustion thermal loss q4% | 1.408 | 1.422 | 0.937 |
In order to make power boiler burning, the qualified stove coal dust that enters obtains higher burning efficiency, the fineness that enters stove coal dust must be controlled in a rational scope.So not only guaranteed coal dust firing fully but also guarantee powder process power consumption and metal consumption, therefore for coal-powder boiler, just need to measure accurately in real time fineness of pulverized coal, there is the planned adjustment boiler combustion status of object, realize the optimum operating mode of boiler, reach the object of energy-saving and emission-reduction.The most frequently used coal powder sampler is that blowing powder producing device enters the measurement of stove fineness of pulverized coal at present, adopt manual operation sampler to sample, working strength is large, operating process complexity, sample time is long, be difficult to reach in real time, sample analysis at any time, sampling result is lack of consistency and is representative, larger on the normal regulating impact of equipment.
Summary of the invention
The object of the present invention is to provide boiler coal-ash fineness On-line Measuring Method, device, induced charge sensor, to solve the above problems.
The embodiment of the present invention provides a kind of boiler coal-ash fineness On-line Measuring Method, comprising:
A. utilize in real time the charge field that in pipeline, coal dust produces, generate equivalent induced charge;
B. adopt AC charge induction and power density spectral analysis method, described equivalent induced charge is analyzed, draw fineness of pulverized coal.
In certain embodiments, be preferably, after described A, before described B, described boiler coal-ash fineness On-line Measuring Method also comprises: described equivalent induced charge is amplified,, described B is: the described equivalent induced charge after amplifying is analyzed, obtained fineness of pulverized coal and fineness of pulverized coal variation tendency.
The embodiment of the present invention also provides a kind of boiler coal-ash fineness on-line measurement device that adopts above-mentioned boiler coal-ash fineness On-line Measuring Method, comprising:
Induced charge assembly, for utilizing in real time the charge field that in pipeline, coal dust produces to generate equivalent induced charge;
Signal processing component, for obtaining described equivalent induced charge from described induced charge assembly, adopts AC charge induction and power density spectral analysis method, and described equivalent induced charge is analyzed, and draws fineness of pulverized coal.
In certain embodiments, be preferably, described induced charge assembly is connected by radio-frequency cable with described signal processing component.
In certain embodiments, be preferably, the length of described radio-frequency cable is less than 50 meters.
In certain embodiments, be preferably, described induced charge assembly also comprises: induced charge amplifier, and it is for amplifying the equivalent induced charge that utilizes the charge field generation that in pipeline, coal dust produces; ,
Described signal processing component, for the described equivalent induced charge after amplifying is analyzed, draws fineness of pulverized coal and fineness of pulverized coal variation tendency.
In certain embodiments, be preferably, described signal processing component, also for obtaining respectively the first equivalent induced charge and the second equivalent induced charge from two described induced charge assemblies at a distance of setpoint distance respectively, extraction possesses described the first equivalent induced charge and the described second equivalent induced charge of correlativity, and calculate the mistiming that gathers the two, utilize described setpoint distance and described mistiming to obtain the flow velocity of coal dust; Described two described induced charge assemblies at a distance of setpoint distance are along the bearing of trend setting of described pipeline.
In certain embodiments, be preferably, described boiler coal-ash fineness on-line measurement device also comprises: display module, for obtaining described fineness of pulverized coal from described signal processing component, and shows; And/or, also comprise: memory module, for obtaining described fineness of pulverized coal from described signal processing component, and storage is for inquiry.
The embodiment of the present invention also provides a kind of induced charge sensor for boiler coal-ash fineness on-line measurement device, comprises metal probe, the postmedian overcoat ceramic pipe of described metal probe.
The boiler coal-ash fineness On-line Measuring Method of the above embodiment of the present invention, device, induced charge sensor, under dynamical state, any two kinds of different materials generation electric charge that will interact, in fine coal course of conveying, between fine coal, mutually collide, rub, coal dust can be with certain electric charge, produce certain charge field, by utilizing in real time this charge field that in pipeline, coal dust produces, generate equivalent induced charge, adopt AC charge induction and power density spectral analysis method, the equivalent induced charge generating is analyzed, can be obtained fineness of pulverized coal.Reach the effect of Real-time Collection, and be only decided by charge field according to induced charge, measurement data is not subject to the impact of the factors such as coal, temperature, ash, stickiness, pressure, flow velocity, wind coal proportion, and data reliability is high.
Accompanying drawing explanation
Fig. 1 is the structural representation of boiler coal-ash fineness on-line measurement device in one embodiment of the invention;
Fig. 2 is the structural representation of induced charge sensor in one embodiment of the invention.
Embodiment
Also by reference to the accompanying drawings the present invention is described in further detail below by specific embodiment.
The embodiment of the present invention provides a kind of boiler coal-ash fineness On-line Measuring Method, comprising:
A. utilize in real time the charge field that in pipeline, coal dust produces, generate equivalent induced charge;
B. adopt AC charge induction and power density spectral analysis method, described equivalent induced charge is analyzed, draw fineness of pulverized coal.
This embodiment of the invention also provides the boiler coal-ash fineness on-line measurement device of corresponding said method, comprising:
Induced charge assembly, for utilizing in real time the charge field that in pipeline, coal dust produces to generate equivalent induced charge;
Signal processing component, for obtaining described equivalent induced charge from described induced charge assembly, adopts AC charge induction and power density spectral analysis method, and described equivalent induced charge is analyzed, and draws fineness of pulverized coal.
This embodiment of the invention also provides the induced charge sensor for boiler coal-ash fineness on-line measurement device, comprises metal probe, the postmedian overcoat ceramic pipe of described metal probe.
Boiler coal-ash fineness on-line measurement device is under dynamical state, according to any two kinds of different materials generation electric charge that will interact, in fine coal course of conveying, between fine coal, mutually collide, rub, coal dust can be with certain electric charge, produce the principle of certain charge field, utilize this charge field that in pipeline, coal dust produces, generate in real time equivalent induced charge by induced charge sensor, adopt AC charge induction and power density spectral analysis method, the equivalent induced charge generating is analyzed, can be obtained fineness of pulverized coal.Reach the effect of Real-time Collection, and be only decided by charge field according to induced charge, measurement data is not subject to the impact of the factors such as coal, temperature, ash, stickiness, pressure, flow velocity, wind coal proportion, and data reliability is high.
Next,, in connection with boiler coal-ash fineness online testing device, as shown in Figure 1, induced charge sensor describes boiler coal-ash fineness On-line Measuring Method in detail:
Step 101 is placed induced charge assembly in pipeline, such as: induced charge sensor 2;
Concrete operations are: at the each airduct of pipeline, 1 place forms a measuring point, places induced charge sensor 2, and induced charge sensor 2 is subject to the effect of pipeline induction field of living in, generates equivalent induced charge.A measuring point is joined double switch amount output contact.One time airduct is communicated with coal pulverizer 3.
This induced charge sensor 2 is at one end provided with metal probe 7, as Fig. 2, shown in, the postmedian outer cover of metal probe 7 has ceramic pipe, ceramic pipe can improve the friction force of metal probe 7, and the metal material that metal probe 7 adopts is also wear-resisting metal material.Adopt the induced charge sensor 2 of this structure can bear the powerful friction of coal dust in pipeline.
This step can adopt following operation in certain embodiments: along the bearing of trend of pipeline, place two induced charge sensors 2 at setpoint distance, two induced charge sensors 2 are subject to respectively the effect of pipeline induction field of living in, generate the first equivalent induced charge, the second equivalent induced charge.
Step 102, amplifies equivalent induced charge;
Concrete operations are: induced charge sensor 2 gathers equivalent induced charge, and equivalent induced charge is passed to processor 5, and processor 5 amplifies processing to equivalent induced charge.
Distance between induced charge sensor 2 and processor 5 determines in 50 meters, and the two adopts radio-frequency cable 4 to connect, and the length of radio-frequency cable 4 is less than 50 meters.
Multiple induced charge sensors 2 form one group, and each group sensor is connected with a signal processing unit cabinet, and signal is processed it and is connected with host computer 6 by fieldbus.
Step 103, adopts AC charge induction and power density spectral analysis method to process the equivalent induced charge amplifying, and draws fineness of pulverized coal.
Can also draw fineness of pulverized coal variation tendency.
Step 104, for another kind of mode of placing induced charge sensor 2 in step 101, extract the first equivalent induced charge and the second equivalent induced charge of two location sensitives, calculate the mistiming that gathers the first equivalent induced charge and the second equivalent induced charge, utilize setpoint distance and mistiming to obtain the flow velocity of coal dust.
The basis of mistiming is: find out and possess correlativity (such as: equate) the first equivalent induced charge and the second equivalent induced charge, determine the time occurring separately, two times are subtracted each other and can obtain the mistiming.
Step 105, shows fineness of pulverized coal, fineness of pulverized coal change curve, storage.
This step can also show and store the flow velocity of coal dust.
Fine coal fineness on-line measurement principle: the measurement mechanism of fineness of pulverized coal is take the induced current signal of sensor sensing as basis, coal particle size difference, with energy of a charge size just different, in the time that the different pulverized coal particle of granularity (smoke intensity) is flowed through metal probe 7, induced current signal power density spectrum spectrum signature is just different, device uses high-speed high-performance digital signal processing DSP to carry out data acquisition process, per second to 10000 pulverized coal particle statistics, through Digital Signal Processing and fast power density spectra mutation analysis, just can stablize and measure relative fineness of pulverized coal, continuous coverage can obtain fineness of pulverized coal situation of change accurately, can arrive fineness of pulverized coal number percent absolute value through on-site proving or Laboratory Calibration.
This boiler coal-ash fineness on-line measurement device can on-line measurement fineness of pulverized coal, can be widely used in all kinds of middle storages, blowing powder producing device.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any modification of doing, be equal to replacement, improvement etc., within all should being included in protection scope of the present invention.
Claims (9)
1. a boiler coal-ash fineness On-line Measuring Method, is characterized in that, comprising:
A. utilize in real time the charge field that in pipeline, coal dust produces, generate equivalent induced charge;
B. adopt AC charge induction and power density spectral analysis method, described equivalent induced charge is analyzed, draw fineness of pulverized coal.
2. boiler coal-ash fineness On-line Measuring Method according to claim 1, is characterized in that,
After described A, before described B, described boiler coal-ash fineness On-line Measuring Method also comprises: described equivalent induced charge is amplified,,
Described B is: the described equivalent induced charge after amplifying is analyzed, obtained fineness of pulverized coal and fineness of pulverized coal variation tendency.
3. a boiler coal-ash fineness on-line measurement device that adopts boiler coal-ash fineness On-line Measuring Method described in claim 1, is characterized in that, comprising:
Induced charge assembly, for utilizing in real time the charge field that in pipeline, coal dust produces to generate equivalent induced charge;
Signal processing component, for obtaining described equivalent induced charge from described induced charge assembly, adopts AC charge induction and power density spectral analysis method, and described equivalent induced charge is analyzed, and draws fineness of pulverized coal.
4. boiler coal-ash fineness on-line measurement device according to claim 3, is characterized in that, described induced charge assembly is connected by radio-frequency cable with described signal processing component.
5. boiler coal-ash fineness on-line measurement device according to claim 3, is characterized in that, the length of described radio-frequency cable is less than 50 meters.
6. boiler coal-ash fineness on-line measurement device according to claim 3, is characterized in that, described induced charge assembly also comprises: induced charge amplifier, and it is for amplifying the equivalent induced charge that utilizes the charge field generation that in pipeline, coal dust produces; ,
Described signal processing component, for the described equivalent induced charge after amplifying is analyzed, draws fineness of pulverized coal and fineness of pulverized coal variation tendency.
7. according to the boiler coal-ash fineness on-line measurement device described in claim 3-6 any one, it is characterized in that, described signal processing component, also for obtaining respectively the first equivalent induced charge and the second equivalent induced charge from two described induced charge assemblies at a distance of setpoint distance respectively, extraction possesses described the first equivalent induced charge and the described second equivalent induced charge of correlativity, and calculate the mistiming that gathers the two, utilize described setpoint distance and described mistiming to obtain the flow velocity of coal dust;
Described two described induced charge assemblies at a distance of setpoint distance are along the bearing of trend setting of described pipeline.
8. according to the boiler coal-ash fineness on-line measurement device described in claim 3-6 any one, it is characterized in that,
Also comprise: display module, for obtaining described fineness of pulverized coal from described signal processing component, and shows; And/or,
Also comprise: memory module, for obtaining described fineness of pulverized coal from described signal processing component, and storage is for inquiry.
9. for an induced charge sensor for boiler coal-ash fineness on-line measurement device, it is characterized in that, comprise metal probe, the postmedian overcoat ceramic pipe of described metal probe.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106124371A (en) * | 2016-08-03 | 2016-11-16 | 西安理工大学 | A kind of Dual-Phrase Distribution of Gas olid fineness measurement device based on electrostatic method and measuring method |
| CN111665165A (en) * | 2020-05-26 | 2020-09-15 | 中国地质大学（武汉） | Natural gas hydrate density sensor based on induced charges |
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| CN2752755Y (en) * | 2004-10-15 | 2006-01-18 | 南京大陆中电科技股份有限公司 | Powder coal fineness on-line detector |
| CN101430269A (en) * | 2008-12-17 | 2009-05-13 | 华北电力大学 | Real-time detection apparatus for coal powder concentration and phase distribution in pneumatic conveying pipe |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106124371A (en) * | 2016-08-03 | 2016-11-16 | 西安理工大学 | A kind of Dual-Phrase Distribution of Gas olid fineness measurement device based on electrostatic method and measuring method |
| CN106124371B (en) * | 2016-08-03 | 2019-03-26 | 西安理工大学 | A kind of Dual-Phrase Distribution of Gas olid fineness measurement device and measurement method based on electrostatic method |
| CN111665165A (en) * | 2020-05-26 | 2020-09-15 | 中国地质大学（武汉） | Natural gas hydrate density sensor based on induced charges |
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Application publication date: 20140528 |