CN212341004U - Pulverized coal fineness on-line measurement optical element protection device - Google Patents
Pulverized coal fineness on-line measurement optical element protection device Download PDFInfo
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- CN212341004U CN212341004U CN202020433085.3U CN202020433085U CN212341004U CN 212341004 U CN212341004 U CN 212341004U CN 202020433085 U CN202020433085 U CN 202020433085U CN 212341004 U CN212341004 U CN 212341004U
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- 230000003287 optical effect Effects 0.000 title claims abstract description 76
- 238000005259 measurement Methods 0.000 title claims abstract description 43
- 239000003245 coal Substances 0.000 title claims abstract description 21
- 239000002817 coal dust Substances 0.000 claims abstract description 9
- 230000001681 protective effect Effects 0.000 claims abstract description 9
- 238000007664 blowing Methods 0.000 claims description 17
- 239000008187 granular material Substances 0.000 claims description 12
- 239000002245 particle Substances 0.000 abstract description 14
- 239000000843 powder Substances 0.000 abstract description 4
- 238000000034 method Methods 0.000 description 6
- 238000000149 argon plasma sintering Methods 0.000 description 2
- 238000011109 contamination Methods 0.000 description 2
- 238000007796 conventional method Methods 0.000 description 2
- 238000005034 decoration Methods 0.000 description 2
- 238000000691 measurement method Methods 0.000 description 2
- 238000004026 adhesive bonding Methods 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000005669 field effect Effects 0.000 description 1
- 239000010419 fine particle Substances 0.000 description 1
- 238000010926 purge Methods 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 238000010408 sweeping Methods 0.000 description 1
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- Optical Measuring Cells (AREA)
Abstract
The invention discloses a coal dust fineness on-line measurement optical element protection device which comprises a measurement cavity, a protective gas system, an optical channel and a measurement system, wherein the measurement cavity is provided with the optical channel, the tail end of the optical channel is provided with the measurement system, the optical channel is provided with the protective gas system, and the protective gas system is used for ejecting high-speed gas to form a gas curtain to prevent coal dust particles entering the optical channel from being adhered to or removing particles adhered to an optical element in the measurement system. The coal powder fineness on-line measurement optical element protection device provided by the invention can prevent coal powder particles from being adhered to an optical element to influence measurement, and improve the measurement stability.
Description
Technical Field
The utility model relates to a granule on-line measuring field, concretely relates to buggy fineness on-line measuring optical element protection device.
Background
Pulverized coal used in thermal power plants is generally formed by grinding coal blocks with a coal mill, and then is transported to a boiler through a pulverized coal pipeline for combustion. The particle size parameter of the pulverized coal particles is always an important index for evaluating a coal grinding system. The conventional method for measuring the particle size of the pulverized coal particles in the primary air pipe is mainly based on a sampling measurement method, and the method has large hysteresis and cannot be combined with real-time regulation and control.
The light scattering method is an effective particle size real-time measurement method, and can measure moving fine particles to obtain particle size information. In the industrial application scenes such as the pulverized coal pipeline, a light source used by the light scattering method directly irradiates a flow field, and meanwhile, a signal receiver needs to face the flow field to receive scattering signals. Therefore, the light source, the signal receiving device and the flow field need to be kept open. In order to prevent the interference of the gas leakage in the pipe to the measuring device and reduce the interference of the measuring device to the flow field to the maximum extent, the conventional method is to install an optical window between the flow field and the light source and the signal receiving device. For high concentration coal dust flow, micron level coal dust particles are easy to adhere to the optical window and difficult to purge and remove. The contaminated window blocks a part of the light source, so that the quality of the light source is reduced, and the signal reception of the signal receiving device is disturbed, which brings great difficulty to the measurement. The process is therefore subject to contamination problems with particles in practice. Contamination problems such as these have plagued some optical methods for multiphase flow measurements.
SUMMERY OF THE UTILITY MODEL
The to-be-solved technical problem of the utility model is, to prior art not enough, provide a protection device at buggy fineness on-line measuring in-process optical element, prevent that the buggy granule from gluing to produce the influence to measuring on optical element, improve measuring stability.
For solving the technical problem, the utility model discloses a technical scheme be:
the utility model provides a buggy fineness on-line measuring optical element protection device, includes measurement chamber, protection gas system, optical channel and measurement system, the last optical channel of having seted up of measurement chamber, measurement system is installed to optical channel's end, the last protection gas system that is equipped with of optical channel, the protection gas system is used for spouting high-speed gas and forms the air curtain and prevent to get into the buggy granule adhesion of optical channel or will adhere to the buggy granule on the optical element in the measurement system and clear away.
Preferably, the protective gas system comprises an air inlet, an annular air chamber and an annular oblique blowing nozzle, protective gas enters the annular air chamber from the air inlet, and is sprayed out by the annular oblique blowing nozzle after flow equalization to form an air curtain positioned in front of the optical element in the measuring system.
Preferably, the waist of the measuring cavity is provided with two coaxial and symmetrical optical channels, and the flow direction of the pulverized coal airflow in the measuring cavity is perpendicular to the optical channels.
The angle formed by the annular oblique blowing nozzle and the central axis of the optical channel is between 0 and 90 degrees, the width of an air curtain sprayed by the annular oblique blowing nozzle is greater than the width of an optical element in the measuring system, and the formula is satisfied:
wherein l is the width of the air curtain, theta is the angle formed by the annular oblique blowing nozzle and the central axis of the optical channel, d is the width of the nozzle slit, and a is the width of the optical element.
The measuring system comprises an optical element with a signal transmitting end and a signal receiving end, wherein the signal transmitting end and the signal receiving end of the measuring system are respectively arranged at the tail ends of different optical channels.
The protective gas is dry and clean compressed air.
In granule on-line measuring field, behind the buggy flow entering measurement chamber, partial buggy granule can get into optical channel because flow field effect, consequently in order to prevent that buggy granule from adhering to or will adhere to the granule on the optical element in the measurement system and clear away, provide the utility model provides a buggy fineness on-line measuring optical element protection device sprays high-speed compressed air efflux through annular oblique blowing nozzle and sweeps the optical window, can prevent that buggy granule from adhering to optical element or sweeping the buggy granule that adheres to the optical element surface and clear away to this cleans the optical window, ensures buggy fineness measurement's accuracy.
Drawings
FIG. 1 is a schematic structural diagram of an on-line measurement optical element protection device for coal powder fineness provided by an embodiment;
FIG. 2 is a schematic structural view of an annular oblique blow nozzle;
wherein, 1, an annular air chamber; 2. an annular inclined blowing nozzle; 3. an air inlet; 4. a signal receiving end; 5. a measurement cavity; 6. a signal transmitting terminal; 7. an optical channel.
Detailed Description
The following is a more detailed description taken in conjunction with the accompanying drawings:
as shown in fig. 1 and fig. 2, the on-line measurement optical element protection device for coal powder fineness provided by this embodiment includes: a measurement chamber 5, a shielding gas system, an optical channel 7 and a measurement system. The waist of the measuring cavity 5 is provided with two coaxial and symmetrical optical channels 7, and the flow direction of the pulverized coal airflow in the measuring cavity 5 is vertical to the optical channels 7. The measuring system comprises an optical element which is provided with a signal transmitting end and a signal receiving end, wherein the signal transmitting end 5 and the signal receiving end 6 are respectively arranged at the tail ends of different optical channels 7. The shielding gas system comprises a gas inlet 3, an annular gas chamber 1 and an annular inclined blowing nozzle 2. The angle formed by the annular oblique blowing nozzle 2 and the central axis of the optical channel 7 is between 0 and 90 degrees, the width of an air curtain sprayed by the annular oblique blowing nozzle 2 is greater than the width of an optical element in a measuring system, and the formula is satisfied:
wherein l is the width of the air curtain, theta is the angle formed by the annular oblique blowing nozzle and the central axis of the optical channel, d is the width of the nozzle slit, and a is the width of the optical element.
When the protection device operates, firstly, dry clean gas such as compressed air is introduced into the air inlet 3 of the protection gas system, and is uniformly sprayed out by the annular inclined blowing nozzle 2 after being equalized by the annular air chamber 1 to form an air curtain, and the positions of the signal transmitting end 4 and the signal receiving end 6 of the measurement system are adjusted to enable the air curtain to completely cover the surface of the optical element. The coal dust airflow to be measured enters the measuring cavity 5. Under the action of the protective gas system, the detected coal dust particles can not contact the optical element, and once the coal dust particles are adhered to the optical element, the coal dust particles can be immediately swept and removed.
The foregoing is a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of improvements and decorations can be made without departing from the principle of the present invention, and these improvements and decorations are also considered as the protection scope of the present invention.
Claims (6)
1. The utility model provides a buggy fineness on-line measuring optical element protection device which characterized in that, includes measurement chamber, protection gas system, optical channel and measurement system, the last optical channel of having seted up of measurement chamber, measurement system is installed to optical channel's end, the last protection gas system that is equipped with of optical channel, protection gas system is used for spouting high-speed gas to form the air curtain and prevents to get into the buggy granule adhesion of optical channel or clear away the buggy granule that has adhered to optical element in measurement system.
2. The device for protecting the optical element for the on-line measurement of the fineness of the pulverized coal as claimed in claim 1, wherein the protective gas system comprises a gas inlet, an annular gas chamber and an annular oblique blowing nozzle, the protective gas enters the annular gas chamber from the gas inlet, and is sprayed out from the annular oblique blowing nozzle after flow equalization to form a gas curtain in front of the optical element in the measurement system.
3. The device for protecting the optical element for the on-line measurement of the fineness of the pulverized coal as claimed in claim 2, wherein the waist of the measurement cavity is provided with two coaxial and symmetrical optical channels, and the flow direction of the airflow of the pulverized coal in the measurement cavity is perpendicular to the optical channels.
4. The device for protecting the optical element for the on-line measurement of the fineness of the pulverized coal as claimed in claim 3, wherein the angle formed by the annular oblique blowing nozzle and the central axis of the optical channel is 0 to 90 degrees, the width of the air curtain sprayed by the annular oblique blowing nozzle is larger than the width of the optical element in the measurement system, and the formula is satisfied:
wherein l is the width of the air curtain, theta is the angle formed by the annular oblique blowing nozzle and the central axis of the optical channel, d is the width of the nozzle slit, and a is the width of the optical element.
5. The protection device for the optical element for the on-line measurement of the fineness of the pulverized coal as claimed in claim 4, wherein the optical element included in the measurement system is provided with a signal transmitting end and a signal receiving end, and the signal transmitting end and the signal receiving end of the measurement system are respectively installed at the tail ends of different optical channels.
6. The on-line measurement optical element protection device for coal dust fineness according to claim 2, characterized in that the shielding gas is compressed air.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020433085.3U CN212341004U (en) | 2020-03-30 | 2020-03-30 | Pulverized coal fineness on-line measurement optical element protection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020433085.3U CN212341004U (en) | 2020-03-30 | 2020-03-30 | Pulverized coal fineness on-line measurement optical element protection device |
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| Publication Number | Publication Date |
|---|---|
| CN212341004U true CN212341004U (en) | 2021-01-12 |
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|---|---|---|---|
| CN202020433085.3U Active CN212341004U (en) | 2020-03-30 | 2020-03-30 | Pulverized coal fineness on-line measurement optical element protection device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR102509923B1 (en) * | 2022-05-13 | 2023-03-14 | 동우옵트론 주식회사 | Dust measuring device |
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2020
- 2020-03-30 CN CN202020433085.3U patent/CN212341004U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR102509923B1 (en) * | 2022-05-13 | 2023-03-14 | 동우옵트론 주식회사 | Dust measuring device |
| WO2023219469A1 (en) * | 2022-05-13 | 2023-11-16 | 동우옵트론 주식회사 | Dust measuring apparatus |
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