CN211453259U - Online sound wave grading plant and coal conveying system - Google Patents
Online sound wave grading plant and coal conveying system Download PDFInfo
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- CN211453259U CN211453259U CN202020140609.XU CN202020140609U CN211453259U CN 211453259 U CN211453259 U CN 211453259U CN 202020140609 U CN202020140609 U CN 202020140609U CN 211453259 U CN211453259 U CN 211453259U
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Abstract
The utility model relates to a coal-fired detection of thermal power factory field especially indicates an online sound wave grading plant and coal conveying system. The on-line sound wave grading device comprises: the detection channel and the sound wave purging grading device; the sound wave purging grading device comprises a sound wave generator and a gas source, and the sound wave generator is communicated with the gas source; a plurality of sound wave generators are arranged in the detection channel side by side from bottom to top, and coal outlets are formed in the side wall of the detection channel and correspond to the opening ends of the sound wave generators. The coal as fired circulates in the detection channel, and when the coal as fired passes through the sound wave generator, the sound wave generator can sweep partial coal particles in the coal as fired to the coal outlet. The coal as fired can be divided into a plurality of different coal particle grades by arranging the plurality of sound wave generators in the detection channel and controlling the sound wave power of the sound wave generators.
Description
Technical Field
The utility model relates to a coal-fired detection of thermal power factory field especially indicates an online sound wave grading plant and coal conveying system.
Background
The large circulating fluidized bed boiler (CFB) of the coal-fired power plant has the advantages of high efficiency, low pollution, suitability for various fuels, good load regulation performance, strong comprehensive ash availability and the like. However, the CFB boiler also puts forward strict requirements on the granularity and the grain composition of the fuel entering the boiler, and the granularity, the grain size distribution and the grain composition of the coal entering the boiler have great influence on ignition starting, operation control and combustion efficiency of the circulating fluidized bed boiler.
The basic requirements for the operation of the circulating fluidized bed boiler are that the dilute phase region and the dense phase region are normally distributed when the bed material is boiling, and the bed temperature is kept stable, so the granularity of the coal as fired must be guaranteed, and a proper screening proportion is required. If a large amount of coal blocks enter the fluidized bed to be combusted in operation, the coal blocks can deposit in the bed body to form a dead zone, the normal fluidized state is damaged, the temperature field in the furnace is not uniform, and the furnace is forced to be shut down due to coking caused by over-low bed temperature or over-high bed temperature. If the particle components of the coal are too fine, the amount of fine powder is educed, even the fine powder can not be captured by a separator, the fine powder enters a tail flue after being incompletely combusted, tail fly ash is increased, the carbon content of the fly ash is increased (more than 50% in serious cases), and the thermal efficiency of a boiler is reduced. Therefore, it is very important to sample and detect the granularity and particle size distribution of the coal as fired in time.
At present, most circulating fluidized bed power plants detect the granularity and the particle size distribution of coal as fired by adopting a laboratory test method after mechanical sampling or manual sampling; the general test time is 6-8 hours according to different coal types, and the test is carried out once per shift. Therefore, the current methods have the following disadvantages:
1) the real-time detection and timely analysis of the granularity effect of the outlet of the crusher cannot be realized, so that problems can be found and adjustment measures can be taken conveniently;
2) due to the influence of human factors and objective conditions, the detection result has deviation.
For a power plant without an intermediate grading coal bunker, the coal after being crushed by the secondary coal crusher directly enters a boiler for combustion through a belt, and because the manual sampling and testing time is long, the coal cannot be detected in time to obtain information feedback, and the coal is sent into a hearth for combustion, is unfavorable for operation regulation, and is not favorable for preventing and controlling the occurrence of boiler operation production accidents caused by excessive granularity in advance.
For detecting the granularity and the particle size distribution of coal as fired in a thermal power plant, the current common laboratory test method comprises the following steps: according to a GB/T477-. With the development of new technologies, the following particle size instruments and methods are available: dynamic light scattering method, nanoparticle tracking analysis technology, resonance quality measurement technology, laser diffraction technology, spatial filtering velocimeter, and automatic imaging technology.
Most of the detection methods are mostly used for laboratory detection. At present, the difficulty of realizing the on-line detection of the coal as fired is that the coal as fired can not be separated on line.
SUMMERY OF THE UTILITY MODEL
The utility model provides an online sound wave grading plant and coal conveying system has solved the problem that the coal as fired can not online separation among the prior art.
The technical scheme of the utility model is realized like this:
an in-line acoustic wave grading device, comprising: the detection channel and the sound wave purging grading device;
the sound wave purging grading device comprises a sound wave generator and a gas source, and the sound wave generator is communicated with the gas source;
a plurality of sound wave generators are arranged in the detection channel side by side from bottom to top, and coal outlets are formed in the side wall of the detection channel and correspond to the opening ends of the sound wave generators.
Preferably, the sound generators are arranged adjacently, and the sound wave power of the sound generator arranged at the low position is greater than the sound wave power of the sound generator arranged at the high position.
Preferably, the sound wave power of the plurality of sound wave generators arranged from top to bottom is gradually increased.
Preferably, the sound wave purging and grading device further comprises an outer protective shell and an outlet protective shell;
the sound wave generator is arranged in the outer protective shell, and the outlet protective shell is arranged at the outlet end of the outer protective shell;
at least the outlet protective shell of the acoustic wave purging and grading device extends into the detection channel.
Preferably, the length of the outlet protection casing is gradually reduced from top to bottom.
Preferably, the outlet protective shell has a plurality of uniformly arranged grid holes.
Preferably, the cross section of the grid holes is square, rectangular or rhombic.
Preferably, the detection channel is a barrel-shaped structure formed by a plurality of side plates, and comprises a front side plate, a rear side plate, a left side plate and a right side plate;
a plurality of layers of platforms are arranged on the left side plate, and a sound wave purging grading device is arranged on each platform of the left side plate;
the right side plate is correspondingly provided with coal outlets, and each coal outlet is symmetrically arranged with one sound wave purging and grading device one by one.
Preferably, the coal mine tunnel;
the detection channel is communicated with the large-particle coal channel through the coal outlet.
A coal handling system, the coal handling system comprising: coal breakers, vibrating screens, coal hoppers, conveyor belts, and online acoustic wave classification devices as described above;
the vibrating screen is arranged at the lower end of the coal crusher, the outlet end of the coal crusher is communicated with the inlet end of the coal dropping hopper, and the outlet end of the coal dropping hopper is positioned at the upper part of the conveying belt;
the inlet end of the detection channel is communicated with the upper end of the coal hopper, and the outlet end of the detection channel is communicated with the lower end of the coal hopper.
The utility model discloses among the technical scheme, the coal as fired circulates in the testing channel, and when the coal as fired passed through acoustic generator, acoustic generator can sweep the part coal grain in the coal as fired to go out the coal mouth. The coal as fired can be divided into a plurality of different coal particle grades by arranging the plurality of sound wave generators in the detection channel and controlling the sound wave power of the sound wave generators. Namely, in the process of conveying the coal as fired, the classification of the coal as fired can be realized.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic structural diagram of an online sound wave classification device provided by the present invention;
fig. 2 is a schematic structural diagram of the acoustic wave purging and classifying device provided by the present invention;
FIG. 3 is a right side view of the sonic purge staging device provided in FIG. 2.
1: a detection channel; 2: a sound wave purging grading device; 3: a large particle coal passage; 4: a coal outlet;
11: a left side plate; 12: a right side plate;
21: an acoustic wave generator; 22: a gas source; 23: an outer protective shell; 24: an outlet protective shell.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
As shown in fig. 1 to 3, in the present embodiment, an on-line acoustic wave classifying device is provided, which includes a detection channel 1 and an acoustic wave purge classifying device 2.
The acoustic wave purging and grading device 2 comprises an acoustic wave generator 21 and an air source 22, wherein the acoustic wave generator 21 is communicated with the air source 22.
A plurality of sound wave generators 21 are arranged in the detection channel 1 side by side from bottom to top, and a coal outlet 4 is arranged on the side wall of the detection channel 1 corresponding to the opening end of each sound wave generator 21.
In the present embodiment, the coal as fired flows through the detection passage 1, and when the coal as fired passes through the sound wave generator, the sound wave generator 21 purges a part of the coal particles in the coal as fired to the coal outlet. By arranging a plurality of sound wave generators 21 in the detection channel 1 and controlling the sound wave power of the sound wave generators 21, the coal as fired can be divided into a plurality of different coal particle grades. Namely, in the process of conveying the coal as fired, the classification of the coal as fired can be realized.
The sound wave generators are arranged adjacently, and the sound wave power of the sound wave generator at the low position is larger than that of the sound wave generator at the high position.
Specifically, the sound wave power of the plurality of sound wave generators arranged from top to bottom is gradually increased.
The larger the power of the sound wave generator is, the larger the coal particles are swept out. The sound wave generators arranged adjacently have the advantage that the power of the sound wave generator at the low position is larger than that of the sound wave generator at the high position, so that the coal as fired can be separated into the gradually enlarged particle size range from top to bottom. The gradual increase here is a linear increase, and may be a nonlinear increase.
Specifically, if the coal as fired in the detection channel 1 needs to be classified into seven grades, the particle size of the coal as fired in the detection channel is gradually increased, and six acoustic purging classification devices are arranged in the detection channel. The sonic generator 21 of each sonic purging classifier 2 corresponds to a unique frequency band that generates sonic gas flow capable of classifying coal particles of different particle sizes and particle size ranges (see table 1).
Table 1: corresponding relation between coal granularity and frequency power
The grading device 2 further comprises an outer jacket 23 and an outlet jacket 24. The acoustic wave generator 21 is disposed within an outer casing 23, and an outlet casing 24 is disposed at an outlet end of the outer casing 23.
And at least the outlet protective shell 24 of the sound wave purging and grading device extends into the detection channel 1, so that the sound wave emitted by the sound wave purging and grading device can enter the detection channel 1.
The length of the outlet shielding shell 433 is gradually reduced from top to bottom. Usually, the detection channel 1 is arranged in a vertical direction. The coal as fired flows in the upward-downward direction while being in the detection passage 1. By setting the outlet shielding shell 433 to the above-described structure, it is possible to prevent the coal as fired from entering the acoustic wave purging classification device.
The acoustic generator 21 comprises a straight tube section and a flare section, wherein the inlet end of the straight tube section is connected with the air source 22, and the outlet section of the straight tube section is connected with the inlet end of the flare section. Specifically, the inlet end of the straight pipe section of the sound wave generator 21 of each sound wave purging and grading device is connected with a branch pipe. Each branch pipe is communicated with one main pipe and then communicated with the air source 22 through the main pipe.
The outlet protective shell 24 has a plurality of uniformly arranged grid holes, the cross section of which is square, rectangular or rhombic. The purpose of arranging the grid holes is to prevent the coal as fired from entering the sound wave purging and grading device. The specific shape of the grid holes can be set according to actual needs.
The detection channel 1 is a barrel-shaped structure formed by a plurality of side plates, and comprises a front side plate, a rear side plate, a left side plate 11 and a right side plate 12.
Specifically, set up a plurality of platforms of placing the sound wave on the left side board 11 of test passage and sweeping grading plant 2, all be provided with a sound wave on every platform of left side board 12 and sweep grading plant 2. The open end of the sound wave generator 21 of the sound wave purging and classifying device 2 is arranged toward the detection channel 1 and can generate sound waves in the detection channel 1. Correspondingly, a coal outlet 4 is arranged on the right side plate 12 corresponding to the opening end of each sound wave generator of the grading device.
In order to collect the coal particles separated by the acoustic purging and grading device 2, the on-line acoustic grading device further comprises a large-particle coal passage 3. The detection channel 1 is communicated with the large-particle coal channel 3 through a coal outlet. The coal separated by the sonic purging classifier 2 eventually enters the large particle coal passage 3.
In this embodiment, there is also provided a coal conveying system, comprising: coal breaker, shale shaker, coal hopper, conveyor belt, and as above the online sound wave grading plant.
Of course, in order to detect the classified coal as fired, a particle size and particle size distribution detection device may be provided in the detection passage. The particle size and particle size distribution measuring device is not the focus of the present application and will not be described in detail here.
The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. An on-line acoustic wave classification device, comprising: the detection channel and the sound wave purging grading device;
the sound wave purging grading device comprises a sound wave generator and a gas source, and the sound wave generator is communicated with the gas source;
a plurality of sound wave generators are arranged in the detection channel side by side from bottom to top, and coal outlets are formed in the side wall of the detection channel and correspond to the opening ends of the sound wave generators.
2. The in-line acoustic grading apparatus of claim 1, characterized by adjacently located acoustic generators, the acoustic power of the acoustic generator located low being greater than the acoustic power of the acoustic generator located high.
3. The on-line acoustic wave grading device according to claim 2, wherein the acoustic power of the plurality of acoustic wave generators arranged from top to bottom is gradually increased.
4. The in-line acoustic wave classifier of claim 1, wherein the acoustic wave purge classifier further comprises an outer shroud and an outlet shroud;
the sound wave generator is arranged in the outer protective shell, and the outlet protective shell is arranged at the outlet end of the outer protective shell;
at least the outlet protective shell of the acoustic wave purging and grading device extends into the detection channel.
5. The in-line acoustic wave grading device according to claim 4, characterized in that the length of the outlet shielding shell is gradually decreasing from top to bottom.
6. The in-line acoustic wave grading device according to claim 4, characterized in that the outlet shield has a plurality of uniformly arranged grating holes.
7. The on-line acoustic wave grading device according to claim 6, characterized in that the cross section of the grating holes is square, rectangular or diamond shaped.
8. The on-line acoustic wave grading device according to claim 1, characterized in that the detection channel is a barrel-shaped structure enclosed by a plurality of side plates, comprising a front side plate, a rear side plate, a left side plate and a right side plate;
a plurality of layers of platforms are arranged on the left side plate, and a sound wave purging grading device is arranged on each platform of the left side plate;
the right side plate is correspondingly provided with coal outlets, and each coal outlet is symmetrically arranged with one sound wave purging and grading device one by one.
9. The on-line acoustic grading device of claim 8, further comprising large particle coal channels;
the detection channel is communicated with the large-particle coal channel through the coal outlet.
10. A coal conveying system, comprising: a coal pulverizer, a vibrating screen, a coal hopper, a conveyor belt, and the on-line acoustic wave classification device of any one of claims 1-9;
the vibrating screen is arranged at the lower end of the coal crusher, the outlet end of the coal crusher is communicated with the inlet end of the coal dropping hopper, and the outlet end of the coal dropping hopper is positioned at the upper part of the conveying belt;
the inlet end of the detection channel is communicated with the upper end of the coal hopper, and the outlet end of the detection channel is communicated with the lower end of the coal hopper.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020140609.XU CN211453259U (en) | 2020-01-21 | 2020-01-21 | Online sound wave grading plant and coal conveying system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020140609.XU CN211453259U (en) | 2020-01-21 | 2020-01-21 | Online sound wave grading plant and coal conveying system |
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| Publication Number | Publication Date |
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| CN211453259U true CN211453259U (en) | 2020-09-08 |
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| CN202020140609.XU Active CN211453259U (en) | 2020-01-21 | 2020-01-21 | Online sound wave grading plant and coal conveying system |
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| CN (1) | CN211453259U (en) |
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