CN112051194A - Composite detection type optical dust instrument and information fusion method - Google Patents
Composite detection type optical dust instrument and information fusion method Download PDFInfo
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- 238000001514 detection method Methods 0.000 title claims abstract description 102
- 239000000428 dust Substances 0.000 title claims abstract description 102
- 230000003287 optical effect Effects 0.000 title claims abstract description 63
- 239000002131 composite material Substances 0.000 title claims abstract description 30
- 238000007500 overflow downdraw method Methods 0.000 title claims abstract description 13
- 238000012545 processing Methods 0.000 claims abstract description 37
- 238000009423 ventilation Methods 0.000 claims abstract description 19
- 230000006698 induction Effects 0.000 claims abstract description 16
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- 238000000034 method Methods 0.000 claims abstract description 9
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- 238000004891 communication Methods 0.000 claims description 13
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- 150000001875 compounds Chemical class 0.000 claims 1
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- 238000012423 maintenance Methods 0.000 abstract description 5
- 239000007789 gas Substances 0.000 description 26
- 238000005259 measurement Methods 0.000 description 11
- 238000006243 chemical reaction Methods 0.000 description 5
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 3
- 239000003546 flue gas Substances 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- 239000004696 Poly ether ether ketone Substances 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000011810 insulating material Substances 0.000 description 2
- WABPQHHGFIMREM-UHFFFAOYSA-N lead(0) Chemical compound [Pb] WABPQHHGFIMREM-UHFFFAOYSA-N 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 229920002530 polyetherether ketone Polymers 0.000 description 2
- 238000000790 scattering method Methods 0.000 description 2
- 229910000619 316 stainless steel Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
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- 239000000463 material Substances 0.000 description 1
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- 230000002035 prolonged effect Effects 0.000 description 1
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- G01P5/00—Measuring speed of fluids, e.g. of air stream; Measuring speed of bodies relative to fluids, e.g. of ship, of aircraft
- G01P5/14—Measuring speed of fluids, e.g. of air stream; Measuring speed of bodies relative to fluids, e.g. of ship, of aircraft by measuring differences of pressure in the fluid
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- G—PHYSICS
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- 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
- G01N15/075—Investigating concentration of particle suspensions by optical means
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Abstract
The invention provides a composite detection type optical dust instrument and an information fusion method, wherein the method comprises the following steps: a control processing device; the probe comprises a probe body and a probe head, and a space between the probe body and the probe head forms a gas detection area; the optical scattering detection system is arranged on the probe rod; the charge induction detection system comprises an electrode shell, and the electrode shell is covered on the rod head in an insulating way; the pressure difference detection system comprises a variable cross-section flow channel, a ventilation assembly and a pressure difference sensor, wherein the variable cross-section flow channel is arranged on the electrode shell in a penetrating mode and comprises a large-diameter flow channel part and a small-diameter flow channel part. The invention can integrate the optical scattering detection system, the charge induction detection system and the air pressure difference detection system on the probe rod, has compact integral structure and low maintenance and manufacturing cost, and improves the reliability and the accuracy of the dust concentration value of the detected gas.
Description
Technical Field
The invention relates to the technical field of dust monitoring, in particular to a composite detection type optical dust meter and an information fusion method.
Background
The dust concentration and the flow velocity need to be detected in the flue gas monitoring, the existing solution is that two sets of independent measuring equipment are adopted for independent measurement and are integrated into a large-scale device, the system is complex and high in cost, and the dust measurement result cannot be optimized by effectively utilizing the correlation between dust and the flow velocity due to the capacity limit of a system integrator.
In the existing dust measuring equipment, a laser scattering method and a charge method are two commonly used measuring technologies, and each technology has own advantages but also has own defects. In order to save costs, only one sensor is usually arranged at one measuring point, which is very disadvantageous for the reliability of the measurement result.
Disclosure of Invention
In view of the above-mentioned drawbacks of the prior art, an object of the present invention is to provide a composite detection type optical dust meter and an information fusion method, which can integrate an optical scattering detection system, a charge sensing detection system and an air pressure difference detection system on a probe rod, have a compact overall structure and low maintenance and manufacturing cost, and improve the reliability and accuracy of the dust concentration value of a measured gas.
In order to solve the above technical problem, the present invention provides a composite detection type optical dust meter, including:
a control processing device;
the detection rod comprises a rod body and a rod head, the rod head is coaxially connected with the rod body through a connecting piece, and a space between the rod body and the rod head forms a gas detection area;
the optical scattering detection system is arranged on the probe rod and is in communication connection with the control processing device;
the charge induction detection system comprises an electrode shell, the electrode shell is covered on the rod head in an insulating way, and the electrode shell is in communication connection with the control processing device;
the pressure difference detection system comprises a variable cross-section flow channel, a ventilation assembly and a pressure difference sensor, wherein the variable cross-section flow channel is arranged in the electrode shell in a penetrating mode and comprises a large-diameter flow channel part and a small-diameter flow channel part, the pressure difference sensor is respectively communicated with the large-diameter flow channel part and the small-diameter flow channel part through the ventilation assembly, and the pressure difference sensor is in communication connection with the control processing device.
Preferably, the vent assembly includes a high-pressure vent pipe and a low-pressure vent pipe, one end of the high-pressure vent pipe is communicated with the small-diameter flow passage portion and the other end is communicated with the differential pressure sensor, and one end of the low-pressure vent pipe is communicated with the large-diameter flow passage portion and the other end is communicated with the differential pressure sensor.
Preferably, the rod head comprises an insulating flange connected with the connecting piece; the electrode shell is provided with a one-way opening, and the opening of the electrode shell is connected with the insulating flange.
Preferably, the electrode shell is cylindrical, the large-diameter flow channel part and the small-diameter flow channel part are oppositely arranged on the electrode shell along the diameter direction of the electrode shell, and the large-diameter flow channel part and the small-diameter flow channel part are communicated through the conical flow channel part.
Preferably, the connector is tubular, and the vent assembly is arranged in a lumen of the connector in a penetrating mode.
Preferably, the electrode shell is connected with the control processing device through a lead, and an insulating layer is coated outside the lead.
Preferably, the optical scatter detection system includes an optical assembly disposed within the electrode housing and a photodetector disposed within the shaft and communicatively connected to the control processing device.
Preferably, the electrode shell is indirectly connected with the control processing device through the first signal amplification module.
The invention also provides an information fusion method of the composite detection type optical dust instrument, which comprises the following steps:
s1, setting a preset flow rate value V0 and a preset flow rate value V1, wherein the preset flow rate value V1 is larger than the preset flow rate value V0; setting a weight value X1, a weight value Y1, a weight value X2, a weight value Y2, a weight value X3 and a weight value Y3;
s2, measuring a first dust concentration value C1 by an optical scattering detection system, measuring a second dust concentration value C2 by a charge induction detection system, and measuring a flow velocity value V by an air pressure difference detection system;
s3, controlling the processing device to obtain a first dust concentration value C1, a second dust concentration value C2 and a flow velocity value V;
s4, when V < V0, the weight value of C1 is X1, the weight value of C2 is Y1, and X1+ Y1 is 100; when V is not less than V, wherein V is not less than V0 and not more than V1, the weight of C1 is X2, the weight of C2 is Y2, and X2+ Y2 is 100; when V > V1, the weight of C1 is X3, the weight of C2 is Y3, and X3+ Y3 is 100; the final dust concentration value is (C1 · X + C2 · Y)/100, where X and Y are weight values corresponding to the flow velocity value V, respectively.
Preferably, in step S4, a preset ratio range is set, when the ratio of the first dust concentration value C1 to the second dust concentration value C2 does not belong to the preset ratio range, it is determined that one of the first dust concentration value C1 and the second dust concentration value C2 is an abnormal dust concentration value, the composite detection type optical dust meter sends an alarm signal, and a weight value corresponding to the abnormal dust concentration value is set to zero.
As described above, the composite detection type optical dust meter and the information fusion method of the present invention have the following advantageous effects: in the invention, the composite detection type optical dust meter comprises an optical scattering detection system, a charge induction detection system and an air pressure difference detection system, and can detect two dust concentration values and one flow velocity value. The electrode shell is covered on the rod head in an insulating way and is in communication connection with the control processing device; the variable cross-section flow channel is arranged in the electrode shell in a penetrating way, and the air pressure difference sensor is respectively communicated with the large-diameter flow channel part and the small-diameter flow channel part through the ventilation assembly. Not only can provide various data of the measured gas related to the dust concentration, but also provides powerful guarantee for the reliability and the accuracy of the dust concentration value. The composite detection type optical dust meter integrates the optical scattering detection system, the charge induction detection system and the air pressure difference detection system on the probe rod, has compact integral structure and low maintenance and manufacturing cost, and provides powerful guarantee for the reliability and the accuracy of the dust concentration value. In addition, the information fusion method can improve the reliability and the accuracy of the final dust concentration value.
Drawings
FIG. 1 is a perspective view of a composite detection optical dust meter according to the present invention;
FIG. 2 is a cross-sectional view of the composite detection optical dust meter of the present invention;
FIG. 3 is an enlarged view of portion A of FIG. 2;
FIG. 4 is a schematic diagram showing the connection of the optical scattering detection system, the charge-induced detection system, the air pressure difference detection system and the control processing device.
Description of the element reference numerals
1 control processing device
2 feeler lever
21 shaft
22 club head
221 insulating flange
23 connecting piece
24 gas detection area
3 optical scattering detection system
31 optical assembly
32 photo detector
33 light source
34 second signal amplifying module
35 second signal acquisition module
4 electric charge induction detection system
41 electrode shell
42 first signal amplification module
43 first signal acquisition module
5 air pressure difference detection system
51 variable cross-section runner
511 large-flow channel part
512 small diameter runner part
513 tapered runner section
52 breather assembly
521 high-pressure vent pipe
522 low pressure vent pipe
53 air pressure difference sensor
54 third signal acquisition module
Detailed Description
The following description of the embodiments of the present invention is provided for illustrative purposes, and other advantages and effects of the present invention will become apparent to those skilled in the art from the present disclosure.
It should be understood that the structures, ratios, sizes, and the like shown in the drawings are only used for matching the disclosure of the present disclosure, and are not used for limiting the conditions that the present disclosure can be implemented, so that the present disclosure is not limited to the technical essence, and any structural modifications, ratio changes, or size adjustments should still fall within the scope of the present disclosure without affecting the efficacy and the achievable purpose of the present disclosure. In addition, the terms "upper", "lower", "left", "right", "middle" and "one" used in the present specification are for clarity of description, and are not intended to limit the scope of the present invention, and the relative relationship between the terms and the terms is not to be construed as a scope of the present invention.
In fig. 3, the X direction is the flow direction of the gas to be measured (e.g., flue gas).
As shown in fig. 1, 2, 3 and 4, the present invention provides a composite detection type optical dust meter, including:
a control processing device 1;
the detection rod 2 comprises a rod body 21 and a rod head 22, wherein the rod head 22 is coaxially connected with the rod body 21 through a connecting piece 23, and a space between the rod body 21 and the rod head 22 forms a gas detection area 24;
the optical scattering detection system 3 is arranged on the probe rod 2 and is in communication connection with the control processing device 1;
the charge induction detection system 4, the charge induction detection system 4 includes the electrode shell 41, the electrode shell 41 is covered on the rod head 22 in the insulation way, the electrode shell 41 is connected with the control processing device 1 in the communication way;
the air pressure difference detection system 5 is characterized in that the air pressure difference detection system 5 comprises a variable cross-section flow passage 51, a ventilation assembly 52 and an air pressure difference sensor 53, the variable cross-section flow passage 51 is arranged on the electrode shell 41 in a penetrating mode, the variable cross-section flow passage 51 comprises a large-diameter flow passage part 511 and a small-diameter flow passage part 512, the air pressure difference sensor 53 is respectively communicated with the large-diameter flow passage part 511 and the small-diameter flow passage part 512 through the ventilation assembly 52, and the air pressure difference sensor 53 is in communication connection with the control processing device 1.
In the invention, the composite detection type optical dust meter comprises an optical scattering detection system 3, a charge induction detection system 4 and an air pressure difference detection system 5, and can measure two dust concentration values and one flow velocity value, and three measurement principles are as follows:
the flow velocity measurement principle of the measured gas is as follows: the variable cross-section flow path 51 is provided through the electrode case 41, and when the gas to be measured flows from the large-diameter flow path portion 511 to the small-diameter flow path portion 512, the gas pressure of the gas to be measured increases, that is, there is a difference between the gas pressure in the large-diameter flow path portion 511 and the gas pressure in the small-diameter flow path portion 512. The air pressure difference is related to the flow rate of the measured gas, and the flow rate of the measured gas is obtained through the existing calculation formula: and V is k-sqrt (delta P/rho), wherein V is the flow velocity value of the measured gas, k is the correction coefficient, delta P is the gas pressure difference, and rho is the mass density of the measured gas. In order to obtain the air pressure difference between the air pressure in the large-diameter flow path portion 511 and the air pressure in the small-diameter flow path portion 512, the air pressure difference sensor 53 is communicated with the large-diameter flow path portion 511 and the small-diameter flow path portion 512 through the vent member 52, respectively.
The measurement principle of the charge method dust concentration value of the gas to be measured is as follows: the dust particles rub against each other during movement to generate electric charges, and the amount of the generated electric charges is in a linear relation with the concentration of the dust particles. When the electric charge in the detected gas approaches the electrode shell 41, a micro-induced current is generated on the electrode shell 41, and the friction between the dust particles and the electrode shell 41 also generates micro-currents, which are amplified and converted into a dust concentration value. The conversion between current value and dust concentration value is the existing method.
The measurement principle of the scattering method dust concentration value of the gas to be measured is as follows: during detection, light is irradiated on the gas to be measured flowing through the gas detection area 24, and scattering occurs. The optical scattering detection system 3 detects the scattered light intensity of the light and converts the scattered light intensity into an electrical signal, which is proportional to the dust concentration value of the gas to be detected. The conversion between electrical signals and dust concentration values is an existing process.
More importantly: the electrode shell 41 is covered on the rod head 22 in an insulating way, and the electrode shell 41 is connected with the control processing device 1 in a communication way; the variable cross-section flow channel 51 is arranged in the electrode shell 41 in a penetrating way, the air pressure difference sensor 53 is respectively communicated with the large-diameter flow channel part 511 and the small-diameter flow channel part 512 through the ventilation component 52, and various detection end parts are integrated at the club head 22, namely, on the basis of the original optical dust meter, the flow velocity measurement function and the charge method dust measurement function are added to the optical dust meter through few parts. Not only can provide various data of the measured gas related to the dust concentration, but also provides powerful guarantee for the reliability and the accuracy of the dust concentration value.
Therefore, the composite detection type optical dust meter integrates the optical scattering detection system 3, the charge induction detection system 4 and the air pressure difference detection system 5 on the probe rod 2, has compact integral structure and low maintenance and manufacturing cost, and provides powerful guarantee for the reliability and the accuracy of the dust concentration value.
In order to simplify the structure of the breather assembly 52, the breather assembly 52 includes a high-pressure breather pipe 521 and a low-pressure breather pipe 522, the high-pressure breather pipe 521 has one end communicating with the minor-diameter flow passage portion 512 and the other end communicating with the differential pressure sensor 53, and the low-pressure breather pipe 522 has one end communicating with the major-diameter flow passage portion 511 and the other end communicating with the differential pressure sensor 53.
The electrode case 41 is made of a conductive material, such as a stainless steel material, which may be 316 stainless steel. The electrode case 41 may be a shell structure of the head 22 in order to protect the head 22.
As shown in fig. 1 and 3, in order to prevent the electric charge on the electrode housing 41 from transferring to the rod head 22, the rod head 22 includes an insulating flange 221, and the insulating flange 221 is connected to the connecting member 23; the electrode case 41 is opened in one direction and the opening of the electrode case 41 is connected to the insulating flange 221. Specifically, the insulating flange 221 is made of an insulating material, such as Polyetheretherketone (PEEK), which is a semi-crystalline polymer material having a good high temperature resistance, a temperature resistance value of up to 300 ℃, mechanical properties comparable to that of an alloy material, and a good electrical insulating material.
As shown in fig. 3, in order to facilitate the manufacture of the electrode case 41 and the variable cross-section flow path 51, the electrode case 41 has a cylindrical shape, the large-diameter flow path portion 511 and the small-diameter flow path portion 512 are disposed in the electrode case 41 so as to be opposed to each other in the diameter direction of the electrode case 41, and the large-diameter flow path portion 511 and the small-diameter flow path portion 512 communicate with each other through the tapered flow path portion 513.
In order to make the structure of the composite detection type optical dust meter more compact and protect the ventilation assembly 52, the connecting member 23 is tubular, and the ventilation assembly 52 is inserted into the lumen of the connecting member 23.
In order to improve the accuracy of the charge method dust concentration measurement, the electrode housing 41 is connected to the control processing device 1 through a lead wire, and the lead wire is covered with an insulating layer. In addition, the lead can also be arranged in the tube cavity of the connecting piece 23 in a penetrating way, so that the service life of the lead is prolonged, and the structure of the composite detection type optical dust meter is more compact.
In order to further improve the integration of the composite detection type optical dust meter, the optical scattering detection system 3 includes an optical component 31 and a photodetector 32, the optical component 31 is disposed in the electrode housing 41, and the photodetector 32 is disposed in the shaft 21 and is in communication connection with the control processing device 1. Furthermore, the optical scattering detection system 3 further comprises a light source 33 (e.g. a laser emitter), a second signal amplification module 34 and a second signal acquisition module 35. The working principle is as follows: the light source 33 emits a light beam, the light beam passes through the gas detection area 24 and then is projected to the optical assembly 31, the optical assembly 31 reflects the light beam to the photodetector 32, the photodetector 32 generates an electrical signal, the electrical signal passes through the second signal amplification module 34 and the second signal acquisition module 35 (the second signal acquisition module 35 may be a digital-to-analog conversion module) in sequence, and finally is transmitted to the control processing device 1.
The electrode case 41 is indirectly connected to the control processing device 1 via the first signal amplification block 42 in order to amplify the processing current value. The charge sensing detection system 4 further includes a first signal collecting module 43 (the first signal collecting module 43 may be a digital-to-analog conversion module), and the first signal amplifying module 42 is indirectly connected to the control processing device 1 through the first signal collecting module 43, so that the control processing device 1 can analyze and process the signal conveniently.
In order to facilitate the analysis and processing of the control processing device 1, the air pressure difference detection system further includes a third signal acquisition module 54, and the air pressure difference sensor 53 is indirectly connected to the control processing device 1 through the third signal acquisition module 54 (the third signal acquisition module 54 may be a digital-to-analog conversion module).
The control processing device 1 comprises a controller, wherein the controller is one of ARM, MCU, FPGA and PLC.
The invention also provides an information fusion method of the composite detection type optical dust instrument, which comprises the following steps:
s1, setting a preset flow rate value V0 and a preset flow rate value V1, wherein the preset flow rate value V1 is larger than the preset flow rate value V0; setting a weight value X1, a weight value Y1, a weight value X2, a weight value Y2, a weight value X3 and a weight value Y3;
s2, measuring a first dust concentration value C1 by the optical scattering detection system 3, measuring a second dust concentration value C2 by the charge induction detection system 4, and measuring a flow velocity value V by the air pressure difference detection system 5;
s3, controlling the processing device 1 to obtain a first dust concentration value C1, a second dust concentration value C2 and a flow velocity value V;
s4, when V < V0, the weight value of C1 is X1, the weight value of C2 is Y1, and X1+ Y1 is 100; when V is not less than V, wherein V is not less than V0 and not more than V1, the weight of C1 is X2, the weight of C2 is Y2, and X2+ Y2 is 100; when V > V1, the weight of C1 is X3, the weight of C2 is Y3, and X3+ Y3 is 100; the final dust concentration value is (C1 · X + C2 · Y)/100, where X and Y are weight values corresponding to the flow velocity value V, respectively.
The information fusion method can improve the reliability and accuracy of the final dust concentration value.
In order to improve the reliability of the final dust concentration value, in step S4, a preset ratio range is set, when the ratio of the first dust concentration value C1 to the second dust concentration value C2 does not belong to the preset ratio range, it is determined that one of the first dust concentration value C1 and the second dust concentration value C2 is an abnormal dust concentration value, the composite detection type optical dust meter sends an alarm signal, and a weight value corresponding to the abnormal dust concentration value is set to zero.
As a specific measurement result of the above information fusion method:
according to the influence of the actual flow velocity value on the dust concentration value of the flue gas, the parameters are set as follows:
the preset flow velocity value V0 is 7m/s, and the preset flow velocity value V1 is 20 m/s; the weight value X1 is 100, and the weight value Y1 is 0; the weight value X2 is 50, and the weight value Y2 is 50; the weight value X3 was 20 and the weight value Y3 was 80.
When V is lower than 7m/s, if C1 is 10mg/m3，C2＝20mg/m3The final dust concentration value is 10mg/m3。
When V exceeds 20m/s, if C1 is 10mg/m3，C2＝20mg/m3The final dust concentration value is 11.2mg/m3。
When V is between 7m/s and 20m/s, if C1 is 10mg/m3，C2＝20mg/m3The final dust concentration value is 8.5mg/m3。
Abnormal conditions are as follows: if C1 is 10mg/m3，C2＝100mg/m3When C2 is 100mg/m3For an abnormal dust concentration value, Y is reduced to zero, and the final dust concentration value is 10mg/m3。
In conclusion, the invention can integrate the optical scattering detection system, the charge induction detection system and the air pressure difference detection system on the probe rod, has compact integral structure and low maintenance and manufacturing cost, and improves the reliability and the accuracy of the dust concentration value of the detected gas. Therefore, the invention effectively overcomes various defects in the prior art and has high industrial utilization value.
The foregoing embodiments are merely illustrative of the principles and utilities of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or change the above-mentioned embodiments without departing from the spirit and scope of the present invention. Accordingly, 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 spirit of the present invention be covered by the claims of the present invention.
Claims (10)
1. A compound detection formula optical dust appearance which characterized in that includes:
a control processing device (1);
the gas detection device comprises a probe rod (2), wherein the probe rod (2) comprises a rod body (21) and a rod head (22), the rod head (22) is coaxially connected with the rod body (21) through a connecting piece (23), and a space between the rod body (21) and the rod head (22) forms a gas detection area (24);
the optical scattering detection system (3), the optical scattering detection system (3) is arranged on the probe rod (2) and is in communication connection with the control processing device (1);
the charge induction detection system (4), the charge induction detection system (4) comprises an electrode shell (41), the electrode shell (41) is covered on the rod head (22) in an insulating way, and the electrode shell (41) is in communication connection with the control processing device (1);
the air pressure difference detection system (5) comprises a variable cross-section flow channel (51), a ventilation assembly (52) and an air pressure difference sensor (53), the variable cross-section flow channel (51) is arranged on the electrode shell (41) in a penetrating mode, the variable cross-section flow channel (51) comprises a large-diameter flow channel part (511) and a small-diameter flow channel part (512), the air pressure difference sensor (53) is respectively communicated with the large-diameter flow channel part (511) and the small-diameter flow channel part (512) through the ventilation assembly (52), and the air pressure difference sensor (53) is in communication connection with the control processing device (1).
2. The composite detection optical dust meter according to claim 1, characterized in that: the ventilation assembly (52) comprises a high-pressure ventilation pipe (521) and a low-pressure ventilation pipe (522), one end of the high-pressure ventilation pipe (521) is communicated with the small-diameter flow passage part (512) and the other end of the high-pressure ventilation pipe is communicated with the air pressure difference sensor (53), one end of the low-pressure ventilation pipe (522) is communicated with the large-diameter flow passage part (511) and the other end of the low-pressure ventilation pipe is communicated with the air pressure difference sensor (53).
3. The composite detection optical dust meter according to claim 1, characterized in that: the club head (22) comprises an insulating flange (221), and the insulating flange (221) is connected with the connecting piece (23); the electrode shell (41) is opened in one direction, and the opening of the electrode shell (41) is connected with an insulating flange (221).
4. The composite detection optical dust meter according to claim 1, characterized in that: the electrode shell (41) is cylindrical, the large-diameter flow channel part (511) and the small-diameter flow channel part (512) are oppositely arranged on the electrode shell (41) along the diameter direction of the electrode shell (41), and the large-diameter flow channel part (511) is communicated with the small-diameter flow channel part (512) through the conical flow channel part (513).
5. The composite detection optical dust meter according to claim 1, characterized in that: the connecting piece (23) is tubular, and the ventilation assembly (52) is arranged in a tube cavity of the connecting piece (23) in a penetrating mode.
6. The composite detection optical dust meter according to claim 1, characterized in that: the electrode shell (41) is connected with the control processing device (1) through a lead, and an insulating layer is coated outside the lead.
7. The composite detection optical dust meter according to claim 1, characterized in that: the optical scattering detection system (3) comprises an optical component (31) and a photoelectric detector (32), wherein the optical component (31) is arranged in an electrode shell (41), and the photoelectric detector (32) is arranged in a shaft (21) and is in communication connection with the control processing device (1).
8. The composite detection optical dust meter according to claim 1, characterized in that: the electrode shell (41) is indirectly connected with the control processing device (1) through a first signal amplification module (42).
9. The information fusion method of the composite detection type optical dust meter according to any one of claims 1 to 8, characterized in that: the method comprises the following steps:
s1, setting a preset flow rate value V0 and a preset flow rate value V1, wherein the preset flow rate value V1 is larger than the preset flow rate value V0; setting a weight value X1, a weight value Y1, a weight value X2, a weight value Y2, a weight value X3 and a weight value Y3;
s2, measuring a first dust concentration value C1 by an optical scattering detection system (3), measuring a second dust concentration value C2 by a charge induction detection system (4), and measuring a flow velocity value V by an air pressure difference detection system (5);
s3, controlling the processing device (1) to obtain a first dust concentration value C1, a second dust concentration value C2 and a flow velocity value V;
s4, when V < V0, the weight value of C1 is X1, the weight value of C2 is Y1, and X1+ Y1 is 100; when V is not less than V, wherein V is not less than V0 and not more than V1, the weight of C1 is X2, the weight of C2 is Y2, and X2+ Y2 is 100; when V > V1, the weight of C1 is X3, the weight of C2 is Y3, and X3+ Y3 is 100; the final dust concentration value is (C1 · X + C2 · Y)/100, where X and Y are weight values corresponding to the flow velocity value V, respectively.
10. The information fusion method according to claim 9, characterized in that: in step S4, a preset ratio range is set, and when the ratio of the first dust concentration value C1 to the second dust concentration value C2 does not fall within the preset ratio range, it is determined that one of the first dust concentration value C1 and the second dust concentration value C2 is an abnormal dust concentration value, the composite detection optical dust meter sends an alarm signal, and returns a weight value corresponding to the abnormal dust concentration value to zero.
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