CN214668415U - 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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- CN214668415U CN214668415U CN202120730987.8U CN202120730987U CN214668415U CN 214668415 U CN214668415 U CN 214668415U CN 202120730987 U CN202120730987 U CN 202120730987U CN 214668415 U CN214668415 U CN 214668415U
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Abstract
The utility model 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; 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 utility model belongs to the technical field of thermal power unit is automatic and observe and control, a electrostatic method dust concentration measuring device of thermal power plant is related to.
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 method cannot be found. 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.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to overcome above-mentioned prior art's shortcoming, provide a thermal power plant electrostatic method dust concentration measuring device, the device can realize the real-time measurement of buggy concentration under the primary air duct high concentration dust environment of thermal power unit to can realize the ultralow continuous monitoring who discharges to reform transform the dust remover export ultralow concentration dust under the environment.
In order to achieve the above object, the thermal power plant electrostatic method dust concentration measuring device of the present invention comprises a wear-resistant electrostatic sensor, an insulating ceramic sleeve, a wiring terminal, a connecting wire, a high impedance in-phase amplifier, a signal amplifying 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 utility model discloses following beneficial effect has:
static method dust concentration measuring device of thermal power plant when concrete operation, insert the pipeline inside of being surveyed the medium with wear-resisting electrostatic transducer, the dust particle of monitoring has an amount of electric charge and produces the electric charge field when the motion, a large amount of electrified dusts move around wear-resisting electrostatic transducer probe, produced induced-current and intraductal dust concentration are highly relevant, the static charge signal that wear-resisting electrostatic transducer gathered, 4 ~ 20mA analog signal to external equipment are exported to the analysis conversion after enlargiing, with the measurement of dust concentration in the realization pipeline, it is required to explain, the utility model discloses can be applied to in the continuous monitoring of dust remover export ultra-low concentration dust under thermal power unit's the real-time measurement of pulverized coal concentration under the tuber pipe high concentration dust environment of wind and the ultra-low emission transformation environment.
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 present invention will be described in further detail with reference to the accompanying drawings:
referring to fig. 1 and 2, the electrostatic dust concentration measuring device of the thermal power plant of 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 utility model discloses still include stainless steel connecting pipe 9, stainless steel screw thread 6, stainless steel base 7 and hexagonal head 8, wherein, stainless steel base 7's one end is connected with stainless steel screw thread 6, on the other end of stainless steel base 7 was fixed in to hexagonal head 8, insulating ceramic sleeve 5's tip was passed stainless steel screw thread 6 and is inserted on stainless steel base 7, stainless steel connecting pipe 9's tip was passed hexagonal head 8 and is inserted in stainless steel base 7, connecting wire 3 passes stainless steel connecting pipe 9.
The utility model discloses still include instrument protective housing 10, wherein, high impedance in-phase amplifier 11, signal amplification unit 12, AD converter 13 and treater 14 all are located instrument protective housing 10.
The utility model discloses still include DA converter 15 and signal output terminal 16, wherein, processor 14's output is connected with signal output terminal 16 through DA converter 15.
The utility model also comprises a display 4, wherein, the processor 14 is connected with 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 utility model discloses a concrete working process does:
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 utility model discloses an accurate electrostatic metering mode, real-time on-line monitoring dust concentration, the electrostatic charge that the buggy was taken in the accurate measurement pipeline, the high degree relevant standard current of dust flow in output and the pipeline has the characteristics of high accuracy, high stability and high reliability, but the analog quantity fastener of isolated output standard signal lug connection DCS system, 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 |
|---|---|---|---|
| CN202120730987.8U CN214668415U (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 |
|---|---|---|---|
| CN202120730987.8U CN214668415U (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 |
|---|---|
| CN214668415U true CN214668415U (en) | 2021-11-09 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120730987.8U Active CN214668415U (en) | 2021-04-09 | 2021-04-09 | Dust concentration measuring device of thermal power plant by electrostatic method |
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| Country | Link |
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| CN (1) | CN214668415U (en) |
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2021
- 2021-04-09 CN CN202120730987.8U patent/CN214668415U/en active Active
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