CN211161026U - Secondary air volume online purging device for thermal power plant - Google Patents
Secondary air volume online purging device for thermal power plant Download PDFInfo
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- CN211161026U CN211161026U CN201921500354.7U CN201921500354U CN211161026U CN 211161026 U CN211161026 U CN 211161026U CN 201921500354 U CN201921500354 U CN 201921500354U CN 211161026 U CN211161026 U CN 211161026U
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Abstract
A secondary air volume online purging device for a thermal power plant mainly comprises an acoustic wave soot blower, an air path control box and an electric control unit, wherein the acoustic wave soot blower is connected with an air source through an air path pipeline; the sound wave soot blower comprises a generator and a sound expansion cylinder connected with the generator, a diaphragm is arranged in the generator, the tail end of the sound expansion cylinder is covered by the diaphragm, the sound expansion cylinder comprises a small sound wave guide pipe horn connected with the generator and a large sound wave guide pipe horn far away from the generator, and the small sound wave guide pipe horn is fixedly connected with the generator through a generator flange; the connecting pipe wall of the small sound wave guide pipe horn and the large sound wave guide pipe horn is a curve formed by alternately connecting a hyperbolic curve and an involute; the air circuit control box comprises an electromagnetic valve and an air filter pressure reducing valve which are arranged on the air circuit pipeline, and the electromagnetic valve is electrically connected with the electric control unit through a cable.
Description
Technical Field
The utility model belongs to the technical field of the secondary amount of wind sampling pipeline of thermal power plant maintains, concretely relates to secondary amount of wind of thermal power plant sweeps device on line.
Background
At present, the air volume measurement is mostly carried out in China thermal power plants by adopting a differential pressure measurement principle, and the differential pressure measurement principle comprises an amplification type pitot tube measuring device, a wing measuring device (also called an array type measuring device) and a plug-in type power bus uniform velocity tube flow measuring device, namely, the secondary air volume measuring device is arranged on a horizontal pipeline of a hot secondary air box at the outlet of an air preheater, the windward side of the measuring device is a pressure side, the leeward side of the measuring device is a pressure side, and a differential pressure signal is taken to calculate the volume flow (needing temperature and pressure compensation). However, most of the measuring devices have the problems of inaccurate air volume measurement and invalid measured data caused by dust accumulation and blockage of sampling pipelines, and cannot truly reflect the flow of secondary air in the pipelines, so that the stable operation of equipment and the safety of a generator set are seriously influenced.
After the dust accumulation phenomenon occurs, the unit is periodically subjected to manual purging during operation, the low-total-air-volume and low-MFT protection is removed, the secondary air volume is forced to be the current value, and the compressed air is used for back flushing one by one from the transmitter; when the unit is shut down, a person is arranged to enter the air box to knock the sampling tube on the positive and negative pressure sides of the sampling device. Both methods are very effective and time and labor consuming.
Disclosure of Invention
The to-be-solved technical problem of the utility model lies in, to the above-mentioned defect of prior art, a device is swept on line to the secondary amount of wind of thermal power plant that simple structure, deashing are effectual and the maintenance cost is low is provided.
The utility model aims at providing an online purging device for secondary air volume of a thermal power plant, which mainly comprises an acoustic wave soot blower, an air path control box and an electric control unit, wherein the acoustic wave soot blower is connected with an air source through an air path pipeline, the air path pipeline between the acoustic wave soot blower and the air source is provided with the air path control box, and the electric control unit is electrically connected with the air path control box; the sound wave soot blower comprises a generator and a sound expansion cylinder connected with the generator, a diaphragm is arranged in the generator, the tail end of the sound expansion cylinder is covered by the diaphragm, the sound expansion cylinder comprises a small sound wave guide pipe horn connected with the generator and a large sound wave guide pipe horn far away from the generator, and the small sound wave guide pipe horn is fixedly connected with the generator through a generator flange; the connecting pipe wall of the small sound wave guide pipe horn and the large sound wave guide pipe horn is a curve formed by alternately connecting a hyperbolic curve and an involute.
Further, the air circuit control box comprises an electromagnetic valve and an air filter pressure reducing valve which are arranged on the air circuit pipeline, and the electromagnetic valve is electrically connected with the electric control unit through a cable.
Furthermore, a manual isolating valve is arranged on the gas path pipeline between the gas path control box and the gas source.
Further, the membrane is a high-strength titanium alloy membrane.
Further, the solenoid valve is a two-position two-way solenoid valve.
The utility model has the advantages of: 1. 360-degree dead-corner-free omnibearing ash removal; because the sound wave has the characteristics of reflection and refraction, high-energy low-frequency sound wave can generate low-frequency vibration in the whole air box after entering the air box along the sound amplifying tube, so that dust attached to the sampling tube is stripped off and leaves the surface of the sampling tube under the action of negative pressure or gravity, the sampling tube is uniformly stressed, and the problems of breakage of the sampling tube or dust cleaning dead angles and the like can not occur. And a DCS control mode is adopted, the ash removal strength can be adjusted according to the field working condition, and the working mode is optimized at any time. 2. The maintenance amount is small, and the cost is low; the whole acoustic wave ash remover has no movable parts (except for the membrane), so that the manual nursing is hardly needed in the using process; the cost of the electromagnetic valve is low, and the labor intensity and the maintenance cost of workers are greatly reduced.
Drawings
Fig. 1 is a schematic view of the overall structure of the present invention;
fig. 2 is a schematic view of the installation of the acoustic wave soot blower according to the present invention;
fig. 3 is an electrical schematic diagram of the electromagnetic valve of the present invention.
Detailed Description
To make the objects, technical solutions and advantages of the present invention more clearly understood by those skilled in the art, the present invention will be further described with reference to the accompanying drawings and examples.
As shown in fig. 1-3, the utility model discloses a kind of thermal power plant's secondary amount of wind online purging device, mainly include sound wave soot blower 1, gas circuit control box 2 and electrical unit 3, sound wave soot blower 1 installs 1 meter after the horizontal pipeline top secondary amount of wind measuring device of thermal power plant's air preheater export hot secondary bellows, sound wave soot blower 1 is connected 5 with the air supply through gas circuit pipeline 4, is provided with gas circuit control box 2 on the gas circuit pipeline 4 between sound wave soot blower 1 and the air supply 5, electrical unit 3 and gas circuit control box 2 electric connection; the acoustic wave soot blower 1 comprises a generator 6 and an acoustic amplification cylinder 7 connected with the generator 6, a diaphragm is arranged in the generator 6, the diaphragm is a high-strength titanium alloy diaphragm, the tail end of the acoustic amplification cylinder 7 is covered by the diaphragm, the acoustic amplification cylinder 7 comprises an acoustic wave guide pipe small horn 8 connected with the generator 6 and an acoustic wave guide pipe large horn 9 far away from the generator 6, and the acoustic wave guide pipe small horn 8 is fixedly connected with the generator 6 through a generator flange 10; the connecting pipe wall of the small sound wave guide pipe horn 8 and the large sound wave guide pipe horn 9 is a curve formed by alternately connecting hyperbolic curves and involutes.
Referring to fig. 1, the air circuit control box 2 includes an electromagnetic valve 11 and an air filter pressure reducing valve 12 which are arranged on the air circuit pipeline 4, the electromagnetic valve 11 is electrically connected with the electronic control unit 3 through a cable, and the electromagnetic valve 11 is a two-position two-way electromagnetic valve; and a manual isolating valve 13 is arranged on the gas path pipeline 4 between the gas path control box 2 and the gas source 5.
The sound wave soot blower is with 0.4 ~ 0.6 Mpa's compressed air as the power supply, through the break-make of solenoid valve control air supply, when the solenoid valve got electric, the air supply pipeline switched on, and the energy that compressed air carried passes through the sound wave and takes place the head and turn into the high sound strong sound wave, and the sound wave produces high acceleration stripping action and the crushing effect of vibration fatigue to adnexed deposition in the sampling tube, makes the deposition not hard up and drops. The acoustic energy ware turns into the sound wave with the energy that compressed air carried, expands the sound barrel and enlargies the sound wave and strengthen, and the gas circuit control box purifies the decompression with compressed air, and the electric control unit provides 220VAC power and DCS control command for the solenoid valve. The sound intensity at the outlet is 145-155 db, the diameter of the sound wave action range is less than or equal to 6m, and the length is less than or equal to 10 m. The electromagnetic valve is a two-position two-way electromagnetic valve, and the power supply is 220VAC/50 HZ. The solenoid valve receives DCS instruction control, and the DCS instruction is connected in series to the 220V power supply.
In the online automatic secondary air blowing device for the thermal power plant, compressed air for instruments of the thermal power plant is adopted as compressed air and is compressed by the air compressor, and the air consumption is 2 m/min.
The utility model discloses utilize the sound wave deashing technique to compressed air is the power supply, make the inside high strength titanium alloy diaphragm self-oscillation of sound production body, and produce vibration in the resonant cavity, convert compressed air's potential energy into low frequency sound energy, send the low frequency, the sound wave of high energy, enlarge through the public address section of thick bamboo, transmit the secondary amount of wind sample pipeline by air medium to sound energy, make the deposition in the sample tube become loose by inseparable, break away from the attachment surface under the effect of gravity or overgrate air, reach the purpose of effective deashing. The sampling pipeline of the air quantity measuring system is smooth, the accuracy and the effectiveness of measured data are guaranteed, the operation is simple, and the practicability is high. The automatic purging device is remotely operated on a CRT by operators, can perform online purging every day, can automatically force secondary air volume to be a current value when the electromagnetic valve is set in a control logic to be powered on for purging, and locks the electromagnetic valve on the opposite side to be powered on, so that disturbance on air volume measurement and regulation loops is avoided in the purging process, and stable operation of equipment and safety of a generator set are ensured. The whole system is simple to operate, has obvious effect and has popularization and application value in coal-fired power plants.
The specific embodiments described herein are merely illustrative of the principles of the present invention and its efficacy, and are not intended to limit the invention. Modifications and variations can be made to the above-described embodiments by those skilled in the art without departing from the spirit and scope of the present invention. Therefore, it is intended that all equivalent modifications or changes which can be made by those skilled in the art without departing from the spirit and technical idea of the present invention shall be covered by the claims of the present invention.
Claims (5)
1. The online blowing device for the secondary air volume of the thermal power plant is characterized by mainly comprising an acoustic wave soot blower, an air path control box and an electric control unit, wherein the acoustic wave soot blower is connected with an air source through an air path pipeline; the sound wave soot blower comprises a generator and a sound expansion cylinder connected with the generator, a diaphragm is arranged in the generator, the tail end of the sound expansion cylinder is covered by the diaphragm, the sound expansion cylinder comprises a small sound wave guide pipe horn connected with the generator and a large sound wave guide pipe horn far away from the generator, and the small sound wave guide pipe horn is fixedly connected with the generator through a generator flange; the connecting pipe wall of the small sound wave guide pipe horn and the large sound wave guide pipe horn is a curve formed by alternately connecting a hyperbolic curve and an involute.
2. The online purging device for the secondary air volume of the thermal power plant as claimed in claim 1, wherein the air circuit control box comprises an electromagnetic valve and an air filter pressure reducing valve which are arranged on the air circuit pipeline, and the electromagnetic valve is electrically connected with the electronic control unit through a cable.
3. The online purging device for the secondary air volume of the thermal power plant as claimed in claim 1 or 2, wherein a manual isolating valve is arranged on an air path pipeline between the air path control box and the air source.
4. The secondary air volume online purging device for the thermal power plant according to claim 1 or 2, wherein the membrane is a high-strength titanium alloy membrane.
5. The online purging device for the secondary air volume of the thermal power plant as claimed in claim 2, wherein the electromagnetic valve is a two-position two-way electromagnetic valve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201921500354.7U CN211161026U (en) | 2019-09-10 | 2019-09-10 | Secondary air volume online purging device for thermal power plant |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201921500354.7U CN211161026U (en) | 2019-09-10 | 2019-09-10 | Secondary air volume online purging device for thermal power plant |
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| CN211161026U true CN211161026U (en) | 2020-08-04 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113494907A (en) * | 2021-07-01 | 2021-10-12 | 广西华都建筑科技有限公司崇左分公司 | Engineering quality detects with straightness detection device that hangs down |
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2019
- 2019-09-10 CN CN201921500354.7U patent/CN211161026U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113494907A (en) * | 2021-07-01 | 2021-10-12 | 广西华都建筑科技有限公司崇左分公司 | Engineering quality detects with straightness detection device that hangs down |
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