CN212301370U - Device for online measurement of carbon content of fly ash in ash bucket - Google Patents
Device for online measurement of carbon content of fly ash in ash bucket Download PDFInfo
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- CN212301370U CN212301370U CN202021306235.0U CN202021306235U CN212301370U CN 212301370 U CN212301370 U CN 212301370U CN 202021306235 U CN202021306235 U CN 202021306235U CN 212301370 U CN212301370 U CN 212301370U
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Abstract
The invention provides a device for online measurement of carbon content in fly ash in an ash bucket, which comprises a connecting flange, a motor, a reversing gear box, a fly ash conveying device and a microwave measuring cavity, wherein the connecting flange is sealed and clamped on an opening of the ash bucket, the motor and a support frame are respectively arranged on the outer side and the inner side of the connecting flange, the microwave measuring cavity is arranged at the bottom of one end of the support frame close to the connecting flange, a blowing nozzle penetrates through the connecting flange and is suspended at the opening side of the microwave measuring cavity, the fly ash conveying device is arranged at the upper part of one end of the support frame far away from the connecting flange, the conveying tail end of the fly ash conveying device is provided with a guide plate which is obliquely arranged, the reversing gear box is arranged on one side of the support frame. The invention eliminates the problems of blockage and update in sampling, improves the reliability and detection precision of fly ash sampling, simultaneously improves the safety in use and avoids the phenomenon of jamming in the operation of the device.
Description
Technical Field
The invention belongs to the technical field of carbon content measurement, and particularly relates to a device for online measurement of carbon content of fly ash in an ash hopper.
Background
The carbon content of the fly ash of the boiler is an important index for reflecting the combustion efficiency of a coal-fired boiler of a thermal power plant, and the real-time measurement of the carbon content of the fly ash is beneficial to monitoring the combustion of the boiler, guiding the combustion adjustment to reduce the coal consumption and improving the economical efficiency and the safety of the unit operation.
Most of the existing online microwave carbon content detection devices adopt a constant-speed sampler to sample fly ash from a flue, a cyclone separator is used for flue gas separation of the fly ash, an ash sample after separation falls into a microwave measurement cavity by means of gravity, once the quantity of the ash sample is enough, a microwave resonance method is started for measurement, and the measured ash sample is sent back to the flue by compressed air. The technology needs to transfer the fly ash from the flue to a microwave measuring cavity outside the flue, and in the process, the fly ash is easy to condense due to the humidity in high-temperature flue gas to block a sampling pipeline, so that the fault occurs. In addition, the high-speed flue gas generates abrasion to the sampler, and the using and maintenance amount is large.
The patent of China application publication No. CN109557261A discloses a fly ash carbon measuring device, which mainly comprises an auger arranged in an ash bucket, wherein an ash sample in the ash bucket and falling in an auger groove is pushed into a microwave measuring cavity by the auger, then the carbon content of the ash sample is measured by a microwave attenuation method, and the measured ash sample is pushed out by the auger in a reverse way, thereby completing a measuring period. As the auger rotates and pushes to generate an extruded ash sample, fine fly ash can be adhered to the auger, and particularly when the fly ash with high humidity and fine particle size or the ash sample with high sulfur content is encountered, the auger sampling groove is easily adhered by the ash sample, so that a new ash sample taking function is difficult to realize. In addition, the auger passes through the microwave measurement cavity, and the structural position change of the auger can influence the precision of microwave measurement.
Disclosure of Invention
The invention aims to provide a device for online measurement of the carbon content of fly ash in an ash hopper, which solves the defects in the prior art, eliminates the problems of blockage and update in sampling, and improves the reliability and detection precision of fly ash sampling.
The technical solution for realizing the purpose of the invention is as follows:
a device for on-line measurement of fly ash carbon content in an ash hopper comprises a connecting flange, a motor, a reversing gear box, a fly ash conveying device and a microwave measurement cavity; the motor is arranged on the outer side of the connecting flange, and the inner side of the connecting flange is provided with a support frame; the microwave measuring cavity is arranged at the bottom of one end of the support frame close to the connecting flange, the blowing nozzle penetrates through the connecting flange, one end of the blowing nozzle extends out of the outer side of the connecting flange, the other end of the blowing nozzle is arranged on the inner side of the connecting flange and is suspended on the opening side of the microwave measuring cavity, and the blowing nozzle is used for removing residual samples in the microwave measuring cavity; the fly ash conveying device is arranged at the upper part of one end of the support frame, which is far away from the connecting flange, and the conveying direction is from the end far away from the connecting flange to the end close to the connecting flange, and is used for collecting and conveying fly ash falling from the adsorption electrode plate of the electrostatic dust collector; the transmission end of the fly ash transmission device is provided with a guide plate which is obliquely installed, the high point of the guide plate is close to the fly ash transmission device, and the low point of the guide plate is suspended above the opening of the microwave measurement cavity and is used for guiding the fly ash on the fly ash transmission device into the microwave measurement cavity; the reversing gear box is arranged on one side of the support frame, the input end of the reversing gear box is connected with the power output shaft of the motor through the coupler, and the output end of the reversing gear box is connected with the power input end of the fly ash conveying device through the transmission shaft.
Furthermore, the device for the online measurement of the carbon content of the fly ash in the ash bucket adopts a sprocket type transmission structure or a roller structure, and the conveying belt adopts a crawler type or belt type structure.
Further, the fly ash conveying device comprises a driving chain wheel, a driven chain wheel, a chain crawler and dust collecting sheets, wherein the driving chain wheel and the driven chain wheel are connected through the chain crawler and rotate synchronously, the driving chain wheel is connected with the output end of the reversing gear box through a transmission shaft, and the chain crawler is fixedly provided with the dust collecting sheets.
Furthermore, the device for online measurement of the carbon content of the fly ash in the ash bucket has the advantages that the microwave measurement cavity is of a cylindrical double-layer three-cavity structure, the upper-layer cavity is a sample pool with an opening at the top, and microwave antennas are respectively arranged in the lower-layer two-cavity, wherein one microwave antenna is a transmitting antenna, and the other microwave antenna is a receiving antenna.
Furthermore, the bottom of the sample pool is made of non-metallic materials.
Further, the device for on-line measurement of the carbon content in the fly ash in the ash bucket adopts a microwave coaxial resonant cavity with 1/4 wavelength or 1/2 wavelength.
Furthermore, the microwave frequency of the microwave measuring cavity is 2 GHz-9 GHz.
Compared with the prior art, the invention adopting the technical scheme has the following technical effects:
1. the device for online measurement of the carbon content of the fly ash in the ash bucket can eliminate the problems of blockage and update in sampling, and improve the reliability and detection precision of fly ash sampling.
2. The device for on-line measurement of the carbon content of the fly ash in the ash bucket improves the safety in use and avoids the phenomenon of jamming in the operation of the device.
3. The device for online measurement of the carbon content of the fly ash in the ash bucket has small abrasion to parts and small maintenance amount.
Drawings
FIG. 1 is a schematic structural diagram I of the device for on-line measurement of carbon content in fly ash in an ash hopper.
FIG. 2 is a schematic structural diagram II of the device for on-line measurement of carbon content in fly ash in an ash hopper according to the present invention.
FIG. 3 is a schematic structural diagram of a microwave measuring cavity of the device for on-line measurement of carbon content in fly ash in an ash hopper.
Reference signs mean: 1: ash bucket, 2: connecting flange, 3: motor, 4: reversing gear case, 5: drive sprocket, 6: driven sprocket, 7: chain track, 8: a guide plate and 9: microwave measurement cavity, 10: purge nozzle, 11: coupling, 12: transmission shaft, 13: support frame, 14: a dust collecting sheet.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.
A device for on-line measurement of fly ash carbon content in an ash hopper comprises a connecting flange 2, a motor 3, a reversing gear box 4, a fly ash conveying device and a microwave measurement cavity 9. Wherein, flange 2 seals to clamp on ash bucket 1 opening, and motor 3 installs in flange 2's the outside, and flange 2's inboard is installed support frame 13. The microwave measurement cavity 9 is installed at the bottom of one end of the support frame 13 close to the connecting flange 2, the purging nozzle 10 penetrates through the connecting flange 2, one end of the purging nozzle extends out of the outer side of the connecting flange 2, the other end of the purging nozzle is arranged on the inner side of the connecting flange 2 and is suspended on the opening side of the microwave measurement cavity 9, and the purging nozzle is used for removing residual samples in the microwave measurement cavity 9. The fly ash conveying device is arranged at the upper part of one end, far away from the connecting flange 2, of the support frame 13, the conveying direction is from far away from the connecting flange 2 to near the connecting flange 2, the fly ash conveying device is used for collecting and conveying fly ash falling from an adsorption electrode plate of the electrostatic dust collector, the fly ash conveying device adopts a chain wheel type transmission structure or a roller structure, and the conveying belt adopts a crawler type or belt type structure. The conveying end of the fly ash conveying device is provided with a guide plate 8 which is obliquely arranged, the high point of the guide plate 8 is close to the fly ash conveying device, and the low point of the guide plate 8 is suspended above the opening of the microwave measuring cavity 9 and is used for guiding the fly ash on the fly ash conveying device into the microwave measuring cavity 9. The reversing gear box 4 is arranged at one side of the support frame 13, the input end of the reversing gear box is connected with the power output shaft of the motor 3 through a coupler 11, and the output end of the reversing gear box is connected with the power input end of the fly ash conveying device through a transmission shaft 12.
Example 1
A device for on-line measurement of fly ash carbon content in an ash hopper comprises a connecting flange 2, a motor 3, a reversing gear box 4, a fly ash conveying device and a microwave measurement cavity 9. Wherein:
the connecting flange 2 is sealed and clamped on the opening of the ash bucket 1. The motor 3 is arranged on the outer side of the connecting flange 2, so that the safety of the device in use is improved. A support frame 13 is mounted on the inner side of the connecting flange 2. The microwave measurement cavity 9 is installed at the bottom of one end of the support frame 13 close to the connecting flange 2, the purging nozzle 10 penetrates through the connecting flange 2, one end of the purging nozzle extends out of the outer side of the connecting flange 2, the other end of the purging nozzle is arranged on the inner side of the connecting flange 2 and is suspended on the opening side of the microwave measurement cavity 9, and the purging nozzle is used for removing residual samples in the microwave measurement cavity 9.
The fly ash conveying device is arranged on the upper part of one end of the support frame 13, which is far away from the connecting flange 2, and the conveying direction is from far away from the connecting flange 2 to near the connecting flange 2, and is used for collecting and conveying fly ash falling from the adsorption electrode plate of the electrostatic dust collector. The conveying end of the fly ash conveying device is provided with a guide plate 8 which is obliquely arranged, the high point of the guide plate 8 is close to the fly ash conveying device, and the low point of the guide plate 8 is suspended above the opening of the microwave measuring cavity 9 and is used for guiding the fly ash on the fly ash conveying device into the microwave measuring cavity 9. The fly ash conveying device adopts a chain wheel type transmission structure, and the conveying belt adopts a crawler type structure. The fly ash conveying device comprises a driving chain wheel 5, a driven chain wheel 6, a chain crawler 7 and dust collecting pieces 14, wherein the driving chain wheel 5 and the driven chain wheel 6 are connected through the chain crawler 7 and rotate synchronously, the driving chain wheel 5 is connected with the output end of the reversing gear box 4 through a transmission shaft 12, and the chain crawler 7 is fixedly provided with the dust collecting pieces 14.
The reversing gear box 4 is arranged on one side of the support frame 13, and the reversing gear box 4 is in a full-sealed form, so that the phenomenon of blocking in the operation of the online device is avoided. The input end of the fly ash conveying device is connected with the power output shaft of the motor 3 through the coupler 11, and the output end of the fly ash conveying device is connected with the power input end of the fly ash conveying device through the transmission shaft 12, so that the stable operation of the fly ash conveying device is ensured.
The microwave measuring cavity 9 is a cylindrical double-layer three-cavity structure, adopts a microwave coaxial resonant cavity with 1/4 wavelength or 1/2 wavelength, and has the microwave frequency of 2 GHz-9 GHz. The upper layer cavity is a sample cell 9-1 with an opening at the top, and the bottom of the sample cell 9-1 is made of non-metallic materials. Microwave antennas 9-2 are respectively arranged in the lower double cavities, one is a transmitting antenna, and the other is a receiving antenna.
Example 2
The device for on-line measurement of fly ash carbon content in an ash bucket is arranged on an ash bucket 1 of an electrostatic dust collector, the installation height of the device is above an ash bucket material level probe and below a dust collector adsorption electrode plate, and the specific working process is as follows:
the device is arranged on the ash bucket 1 through a connecting flange 2, and sealing is guaranteed.
The power supply is switched on, the motor 3 is started, the reversing gear box 4 is driven to rotate through the coupler 11, the output end of the reversing gear box 4 enables the driving chain wheel 5 to rotate through the transmission shaft 12, and therefore the chain crawler 7 and the driven chain wheel 6 are driven to synchronously rotate.
The fly ash falls down from the adsorption electrode plate of the electrostatic dust collector and continuously falls onto the dust collection sheet 14 arranged on the chain crawler 7 under the action of the gravity of an ash sample, and the dust collection sheet 14 plays a role in collecting ash.
The control program controls the chain crawler 7 to move periodically, so that the ash sample on the chain crawler 7 is guided to the sample pool 9-1 of the microwave measuring cavity 9 through the guide plate 8, and the sample pool 9-1 is ensured to be filled with the ash sample according to the collection time set by the program.
The program controls the microwave frequency sweep instrument to send out a microwave frequency sweep signal to the microwave transmitting antenna, the microwave power detector receives the microwave signal transmitted by the microwave receiving antenna, the calculating unit calculates the carbon content of the fly ash according to the change of the microwave power spectrum and the deviation of the resonant frequency, and the fly ash content signal obtained after calculation is transmitted to a user by the control unit.
And opening the purging electromagnetic valve, and controlling the compressed air to be sent into the purging nozzle 10 to purge the sample cell 9-1, so as to empty the ash sample in the sample cell 9-1 for receiving the next ash sample measurement.
The program is circulated, so that the on-line continuous measurement of the carbon content of the fly ash in the ash bucket is realized.
The foregoing is directed to embodiments of the present invention and, more particularly, to a method and apparatus for controlling a power converter in a power converter, including a power converter, a power.
Claims (7)
1. A device for on-line measurement of carbon content in fly ash in an ash bucket is characterized by comprising a connecting flange (2), a motor (3), a reversing gear box (4), a fly ash conveying device and a microwave measuring cavity (9); the connecting flange (2) is hermetically clamped on an opening of the ash bucket (1), the motor (3) is installed on the outer side of the connecting flange (2), and the inner side of the connecting flange (2) is provided with a support frame (13);
the microwave measuring cavity (9) is arranged at the bottom of one end, close to the connecting flange (2), of the support frame (13), the purging nozzle (10) penetrates through the connecting flange (2), one end of the purging nozzle extends out of the outer side of the connecting flange (2), the other end of the purging nozzle is arranged on the inner side of the connecting flange (2) and is suspended at the opening side of the microwave measuring cavity (9) in a hanging mode, and the purging nozzle is used for removing residual samples in the microwave measuring cavity (9);
the fly ash conveying device is arranged at the upper part of one end of the support frame (13) far away from the connecting flange (2), and the conveying direction is from far away from the connecting flange (2) to close to the connecting flange (2) and is used for collecting and conveying fly ash falling from an adsorption electrode plate of the electrostatic dust collector; the conveying tail end of the fly ash conveying device is provided with a guide plate (8) which is obliquely arranged, the high point of the guide plate (8) is close to the fly ash conveying device, and the low point of the guide plate is suspended above the opening of the microwave measuring cavity (9) and is used for guiding the fly ash on the fly ash conveying device into the microwave measuring cavity (9);
the reversing gear box (4) is arranged on one side of the support frame (13), the input end of the reversing gear box is connected with the power output shaft of the motor (3) through a coupler (11), and the output end of the reversing gear box is connected with the power input end of the fly ash conveying device through a transmission shaft (12).
2. The device for the on-line measurement of the carbon content of the fly ash in the ash hopper according to claim 1, wherein the fly ash conveying device adopts a chain wheel type transmission structure or a roller structure, and the conveying belt adopts a crawler type or belt type structure.
3. The device for the online measurement of the carbon content of the fly ash in the ash bucket according to claim 1 or 2, wherein the fly ash conveying device comprises a driving chain wheel (5), a driven chain wheel (6), a chain crawler (7) and dust collecting sheets (14), wherein the driving chain wheel (5) and the driven chain wheel (6) are connected through the chain crawler (7) and rotate synchronously, the driving chain wheel (5) is connected with the output end of the reversing gear box (4) through a transmission shaft (12), and the chain crawler (7) is fixed with the dust collecting sheets (14).
4. The device for on-line measurement of carbon content in fly ash in an ash hopper according to claim 1, wherein the microwave measurement cavity (9) is a cylindrical double-layer three-cavity structure, wherein the upper cavity is a sample cell (9-1) with an open top, and microwave antennas (9-2) are respectively arranged in the lower double-cavity, one is a transmitting antenna, and the other is a receiving antenna.
5. The device for the on-line measurement of the carbon content in fly ash in an ash hopper according to claim 4, characterized in that the bottom of the sample cell (9-1) is made of non-metallic material.
6. The device for on-line measurement of carbon content in fly ash in an ash hopper according to claim 1 or 4, characterized in that the microwave measuring cavity (9) adopts a microwave coaxial resonant cavity with 1/4 wavelength or 1/2 wavelength.
7. The device for the on-line measurement of the carbon content of the fly ash in the ash bucket according to the claim 1 or 4, characterized in that the microwave frequency of the microwave measuring cavity (9) is 2 GHz-9 GHz.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202021306235.0U CN212301370U (en) | 2020-07-07 | 2020-07-07 | Device for online measurement of carbon content of fly ash in ash bucket |
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| CN202021306235.0U CN212301370U (en) | 2020-07-07 | 2020-07-07 | Device for online measurement of carbon content of fly ash in ash bucket |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111665265A (en) * | 2020-07-07 | 2020-09-15 | 南京大得科技有限公司 | Device for online measurement of carbon content of fly ash in ash bucket |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111665265A (en) * | 2020-07-07 | 2020-09-15 | 南京大得科技有限公司 | Device for online measurement of carbon content of fly ash in ash bucket |
| CN111665265B (en) * | 2020-07-07 | 2022-11-29 | 南京大得科技有限公司 | Device for online measurement of carbon content of fly ash in ash bucket |
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