CN112986085A - Dust concentration measuring device of thermal power plant by electrostatic method - Google Patents
Dust concentration measuring device of thermal power plant by electrostatic method Download PDFInfo
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- CN112986085A CN112986085A CN202110385339.8A CN202110385339A CN112986085A CN 112986085 A CN112986085 A CN 112986085A CN 202110385339 A CN202110385339 A CN 202110385339A CN 112986085 A CN112986085 A CN 112986085A
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- 239000000428 dust Substances 0.000 title claims abstract description 44
- 238000000034 method Methods 0.000 title claims abstract description 16
- 239000000919 ceramic Substances 0.000 claims abstract description 18
- 230000003321 amplification Effects 0.000 claims abstract description 11
- 238000003199 nucleic acid amplification method Methods 0.000 claims abstract description 11
- 229910001220 stainless steel Inorganic materials 0.000 claims description 36
- 239000010935 stainless steel Substances 0.000 claims description 36
- 239000000843 powder Substances 0.000 claims description 6
- 229910052593 corundum Inorganic materials 0.000 claims description 3
- 239000010431 corundum Substances 0.000 claims description 3
- 239000000463 material Substances 0.000 claims description 3
- 238000005259 measurement Methods 0.000 abstract description 11
- 239000002817 coal dust Substances 0.000 abstract description 8
- 238000012544 monitoring process Methods 0.000 abstract description 2
- 239000002245 particle Substances 0.000 description 12
- 239000003245 coal Substances 0.000 description 6
- 230000001681 protective effect Effects 0.000 description 4
- 239000007787 solid Substances 0.000 description 3
- 238000004458 analytical method Methods 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 239000000523 sample Substances 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000009529 body temperature measurement Methods 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000002596 correlated effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 238000012432 intermediate storage Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000010298 pulverizing process Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000000779 smoke Substances 0.000 description 1
- 230000005514 two-phase flow Effects 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
- G01N15/06—Investigating concentration of particle suspensions
- G01N15/0656—Investigating concentration of particle suspensions using electric, e.g. electrostatic methods or magnetic methods
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- Chemical & Material Sciences (AREA)
- Dispersion Chemistry (AREA)
- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)
Abstract
The invention discloses a thermal power plant electrostatic method dust concentration measuring device, which comprises a wear-resistant electrostatic sensor, an insulating ceramic sleeve, a wiring terminal, a connecting wire, a high-impedance in-phase amplifier, a signal amplification unit, an A/D converter and a processor, wherein the insulating ceramic sleeve is arranged on the insulating ceramic sleeve; the upper end of the wear-resistant electrostatic sensor is inserted into the insulating ceramic sleeve, the output end of the wear-resistant electrostatic sensor is connected with the input end of the processor through the wiring terminal, the connecting wire, the high-impedance in-phase amplifier, the signal amplification unit and the A/D converter in sequence, the device can realize real-time measurement of coal dust concentration in a primary air pipe high-concentration dust environment of a thermal power generating unit, and can realize continuous monitoring of ultralow-concentration dust at the outlet of the dust remover in an ultralow-emission reconstruction environment.
Description
Technical Field
The invention belongs to the technical field of automation and measurement and control of thermal power units, and relates to a thermal power plant dust concentration measuring device by an electrostatic method.
Background
The requirements of the dust concentration measurement of a thermal power plant are very urgent all the time, such as the measurement of the coal dust concentration of a primary air pipe of a coal dust boiler, the measurement of the coal dust content of tertiary air, the measurement of the dust concentration of an electrostatic dust collector and an outlet of a bag-type dust collector, and the like, but the measurement of the dust concentration is always a difficult problem at home and abroad, firstly, the abrasion problem of a measuring sensor is difficult to solve, secondly, the pollution to the measuring sensor caused by different dust concentrations is very serious, the long-term stable operation is difficult, thirdly, the measuring principle and the dust movement mechanism are not thorough, and a proper measuring. At present, the most mature primary air pipe pulverized coal concentration measurement of a domestic thermal power generating unit adopts a thermal balance method of temperature measurement, and unfortunately, the method is only limited to an intermediate storage bin type pulverizing system boiler with large temperature difference between pulverized coal and hot air. After the ultra-low emission of the thermal power generating unit is transformed, the measurement of the smoke concentration behind the dust remover is always controversial, and the measuring instrument in the aspect is always monopolized by the incompletely mature technology and products of a few international enterprises. Therefore, the research on a simple and economic dust concentration measuring method is not only indispensable to the wind-coal ratio and the safe and economic operation of the thermal power generating unit, but also is vital to the operation optimization and the high-level control of an environmental protection system.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides the electrostatic method dust concentration measuring device for the thermal power plant, which can realize the real-time measurement of the coal dust concentration in the high-concentration dust environment of the primary air pipe of the thermal power unit and can realize the continuous monitoring of the ultra-low-concentration dust at the outlet of the dust remover in the ultra-low emission reconstruction environment.
In order to achieve the purpose, the electrostatic method dust concentration measuring device of the thermal power plant comprises a wear-resistant electrostatic sensor, an insulating ceramic sleeve, a wiring terminal, a connecting wire, a high-impedance in-phase amplifier, a signal amplification unit, an A/D converter and a processor;
the upper end of the wear-resistant electrostatic sensor is inserted into the insulating ceramic sleeve, and the output end of the wear-resistant electrostatic sensor is connected with the input end of the processor through a wiring terminal, a connecting wire, a high-impedance in-phase amplifier, a signal amplification unit and an A/D converter in sequence.
The insulating ceramic bushing is characterized by further comprising a stainless steel connecting pipe, a stainless steel thread, a stainless steel base and a hexagonal head, wherein one end of the stainless steel base is connected with the stainless steel thread, the hexagonal head is fixed at the other end of the stainless steel base, the end of the insulating ceramic bushing penetrates through the stainless steel thread and is inserted into the stainless steel base, the end of the stainless steel connecting pipe penetrates through the hexagonal head and is inserted into the stainless steel base, and a connecting wire penetrates through the stainless steel connecting pipe.
The high-impedance in-phase amplifier, the signal amplification unit, the A/D converter and the processor are all located in the instrument protective shell.
The device also comprises a D/A converter and a signal output terminal, wherein the output end of the processor is connected with the signal output terminal through the D/A converter.
The system further comprises a display, wherein the processor is connected with the display.
The insulating ceramic sleeve is made of ultrafine powder high-insulating corundum material.
The invention has the following beneficial effects:
when the thermal power plant electrostatic method dust concentration measuring device is specifically operated, a wear-resistant electrostatic sensor is inserted into a pipeline of a measured medium, monitored dust particles carry a certain amount of charges and generate a charge field when moving, a large amount of charged dust moves around a probe of the wear-resistant electrostatic sensor, generated induced current is highly related to the dust concentration in the pipeline, and an electrostatic charge signal acquired by the wear-resistant electrostatic sensor is analyzed, converted and amplified and then outputs a 4-20 mA analog signal to external equipment to realize the measurement of the dust concentration in the pipeline.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a diagram of an electronic system according to the present invention.
The sensor comprises a wear-resistant electrostatic sensor 1, a wiring terminal 2, a connecting wire 3, a display 4, an insulating ceramic bushing 5, a stainless steel thread 6, a stainless steel base 7, a hexagonal head 8, a stainless steel connecting pipe 9, an instrument protective shell 10, a high-impedance in-phase amplifier 11, a signal amplification unit 12, an A/D converter 13, an intelligent processor 14, a D/A converter 15 and a signal output terminal 16.
Detailed Description
The invention is described in further detail below with reference to the accompanying drawings:
referring to fig. 1 and 2, the thermal power plant electrostatic method dust concentration measuring device according to the present invention includes a wear-resistant electrostatic sensor 1, an insulating ceramic bushing 5, a connection terminal 2, a connection wire 3, a high-impedance in-phase amplifier 11, a signal amplification unit 12, an a/D converter 13, and a processor 14; the upper end of the wear-resistant electrostatic sensor 1 is inserted into the insulating ceramic sleeve 5, and the output end of the wear-resistant electrostatic sensor 1 is connected with the input end of the processor 14 through the wiring terminal 2, the connecting wire 3, the high-impedance in-phase amplifier 11, the signal amplification unit 12 and the A/D converter 13 in sequence.
The invention also comprises a stainless steel connecting pipe 9, a stainless steel thread 6, a stainless steel base 7 and a hexagonal head 8, wherein one end of the stainless steel base 7 is connected with the stainless steel thread 6, the hexagonal head 8 is fixed on the other end of the stainless steel base 7, the end part of the insulating ceramic bushing 5 passes through the stainless steel thread 6 and is inserted into the stainless steel base 7, the end part of the stainless steel connecting pipe 9 passes through the hexagonal head 8 and is inserted into the stainless steel base 7, and the connecting lead 3 passes through the stainless steel connecting pipe 9.
The invention further comprises a protective instrument shell 10, wherein the high-impedance in-phase amplifier 11, the signal amplification unit 12, the A/D converter 13 and the processor 14 are all located in the protective instrument shell 10.
The present invention further comprises a D/a converter 15 and a signal output terminal 16, wherein the output terminal of the processor 14 is connected to the signal output terminal 16 via the D/a converter 15.
The invention also includes a display 4, wherein the processor 14 is connected to the display 4; the insulating ceramic sleeve 5 is made of ultrafine powder high-insulating corundum material.
The processing result of the processor 14 is subjected to D/A conversion through a D/A converter 15, and then 4-20 mA standard signal output is carried out through a signal output terminal 16; the processor 14 calculates the actual dust concentration using wavelet analysis and fast fourier analysis.
The specific working process of the invention is as follows:
the coal powder of the thermal power plant and the dust particles at the outlet of the dust collector consist of particle groups with different diameters, the diameter of the particles is changed within the range of 10-120 mu m, and the number of the particles with different diameters is normally distributed. The electrostatic induction is generated by the collision with each other and the collision with the wear-resistant electrostatic sensor 1 during the movement. In the process of conveying the gas-solid two-phase fluid containing the dust particles through the pipeline, the dust particles and the dust particles, the dust particles and the inner wall of the pipeline, the dust particles and the conveying gas collide and rub, and the dust particles and the probe of the wear-resistant electrostatic sensor 1 collide and rub, so that the coal dust particles are charged with electrostatic charges. The electrostatic charge quantity is directly and positively correlated with the coal powder flow in the gas-solid two-phase fluid in the pipeline, and the weighted arithmetic mean value of the charge quantity and the weighted root mean square value of the disturbance quantity reflect the coal powder flow in the pipeline. Further, the processor 14 adopts fast fourier transform calculation to accurately calculate the dust concentration of the gas-solid two-phase flow in the pipeline.
The invention adopts a precise electrostatic metering mode, monitors the dust concentration on line in real time, accurately measures the electrostatic charge carried by the coal dust in the pipeline, outputs the standard current highly related to the flow of the coal dust in the pipeline, has the characteristics of high precision, high stability and high reliability, can directly connect the standard signal isolated and output with an analog quantity clamping piece of a DCS system, and is convenient to use, safe and reliable.
Claims (6)
1. The device for measuring the dust concentration of the thermal power plant by the electrostatic method is characterized by comprising a wear-resistant electrostatic sensor (1), an insulating ceramic sleeve (5), a wiring terminal (2), a connecting wire (3), a high-impedance in-phase amplifier (11), a signal amplification unit (12), an A/D converter (13) and a processor (14);
the upper end of the wear-resistant electrostatic sensor (1) is inserted into the insulating ceramic sleeve (5), and the output end of the wear-resistant electrostatic sensor (1) is connected with the input end of the processor (14) through the wiring terminal (2), the connecting wire (3), the high-impedance in-phase amplifier (11), the signal amplification unit (12) and the A/D converter (13) in sequence.
2. The thermal power plant electrostatic method dust concentration measuring device according to claim 1, further comprising a stainless steel connecting pipe (9), a stainless steel thread (6), a stainless steel base (7) and a hexagonal head (8), wherein one end of the stainless steel base (7) is connected with the stainless steel thread (6), the hexagonal head (8) is fixed on the other end of the stainless steel base (7), the end of the insulating ceramic sleeve (5) penetrates through the stainless steel thread (6) and is inserted into the stainless steel base (7), the end of the stainless steel connecting pipe (9) penetrates through the hexagonal head (8) and is inserted into the stainless steel base (7), and the connecting wire (3) penetrates through the stainless steel connecting pipe (9).
3. The electrostatic method dust concentration measuring device of the thermal power plant as claimed in claim 1, further comprising a meter protection casing (10), wherein the high impedance in-phase amplifier (11), the signal amplifying unit (12), the A/D converter (13) and the processor (14) are all located in the meter protection casing (10).
4. The electrostatic dust concentration measuring apparatus of a thermal power plant according to claim 1, further comprising a D/a converter (15) and a signal output terminal (16), wherein the output of the processor (14) is connected to the signal output terminal (16) via the D/a converter (15).
5. The electrostatic dust concentration measuring device of the thermal power plant according to claim 1, further comprising a display (4), wherein the processor (14) is connected with the display (4).
6. The electrostatic dust concentration measuring device of the thermal power plant according to claim 1, wherein the insulating ceramic bushing (5) is made of ultra-fine powder high insulating corundum material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110385339.8A CN112986085A (en) | 2021-04-09 | 2021-04-09 | Dust concentration measuring device of thermal power plant by electrostatic method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110385339.8A CN112986085A (en) | 2021-04-09 | 2021-04-09 | Dust concentration measuring device of thermal power plant by electrostatic method |
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| Publication Number | Publication Date |
|---|---|
| CN112986085A true CN112986085A (en) | 2021-06-18 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110385339.8A Pending CN112986085A (en) | 2021-04-09 | 2021-04-09 | Dust concentration measuring device of thermal power plant by electrostatic method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115338197A (en) * | 2022-07-08 | 2022-11-15 | 安徽新能自动化设备股份有限公司 | Wireless transmission coal particulate matter state analysis and adjustment system |
-
2021
- 2021-04-09 CN CN202110385339.8A patent/CN112986085A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115338197A (en) * | 2022-07-08 | 2022-11-15 | 安徽新能自动化设备股份有限公司 | Wireless transmission coal particulate matter state analysis and adjustment system |
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