Compound Detection Optical Dust Meter and Information Fusion Method

Abstract

The present invention provides a composite detection optical dust meter and information fusion method, including: a control processing device; a probe rod, the probe rod includes a rod body and a rod head, and the space between the rod body and the rod head constitutes a gas detection area; an optical scattering detection system, the optical scattering detection system is arranged on the probe rod; a charge induction detection system, the charge induction detection system includes an electrode shell, and the electrode shell insulation cover is arranged on the rod head; an air pressure difference detection system, the air pressure difference detection system includes a variable cross-section flow channel, a ventilation component and an air pressure difference sensor, the variable cross-section flow channel is arranged through the electrode shell, and the variable cross-section flow channel includes a large-diameter flow channel part and a small-diameter flow channel part. The present invention can integrate the optical scattering detection system, the charge induction detection system and the air pressure difference detection system on the probe rod, the overall structure is compact, the maintenance and manufacturing cost is low, and the reliability and accuracy of the dust concentration value of the measured gas are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of dust monitoring, and in particular to a composite detection optical dust monitor and an information fusion method. Background Art

[0002] Dust concentration and flow rate need to be detected in flue gas monitoring. The existing solutions all use two independent sets of measurement equipment for independent measurement and integrate them into one large device. Not only is the system complex and costly, but also due to the limited capabilities of system integrators, it is impossible to effectively use the correlation between dust and flow rate to optimize the dust measurement results.

[0003] Among the existing dust measurement equipment, laser scattering method and charge method are two commonly used measurement technologies. Each technology has its own advantages, but also has its own shortcomings. In order to save costs, only one sensor is usually arranged at one measurement point, which is very unfavorable to the reliability of the measurement results. Summary of the invention

[0004] In view of the shortcomings of the prior art mentioned above, the technical problem to be solved by the present invention is to provide a composite detection optical dust meter and an information fusion method, which can integrate the optical scattering detection system, the charge induction detection system and the air pressure difference detection system on the probe rod. The overall structure is compact and the maintenance and manufacturing cost is low, which improves the reliability and accuracy of the dust concentration value of the measured gas.

[0005] In order to solve the above technical problems, the present invention provides a composite detection optical dust meter, comprising:

[0006] Control processing devices;

[0007] The probe rod comprises a rod body and a rod head, the rod head is coaxially connected to the rod body through a connecting piece, and the space between the rod body and the rod head constitutes a gas detection area;

[0008] An optical scattering detection system, which is arranged on the probe rod and is in communication connection with the control processing device;

[0009] A charge induction detection system, the charge induction detection system comprises an electrode shell, an electrode shell insulating cover is arranged on the rod head, and the electrode shell is communicatively connected with the control processing device;

[0010] The air pressure difference detection system includes a variable cross-section flow channel, a ventilation component and an air pressure difference sensor. The variable cross-section flow channel is arranged through the electrode shell. The variable cross-section flow channel includes a large diameter flow channel portion and a small diameter flow channel portion. The air pressure difference sensor is connected to the large diameter flow channel portion and the small diameter flow channel portion respectively through the ventilation component. The air pressure difference sensor is communicatively connected with the control processing device.

[0011] Preferably, the ventilation assembly includes a high-pressure ventilation pipe and a low-pressure ventilation pipe. One end of the high-pressure ventilation pipe is communicated with the small-diameter flow channel part and the other end is communicated with the differential pressure sensor. One end of the low-pressure ventilation pipe is communicated with the large-diameter flow channel part and the other end is communicated with the differential pressure sensor.

[0012] Preferably, the club head includes an insulating flange which is connected to the connecting member; the electrode housing is unidirectionally open and the opening of the electrode housing is connected to the insulating flange.

[0013] Preferably, the electrode housing is cylindrical. The large-diameter flow channel part and the small-diameter flow channel part are oppositely arranged along the diameter direction of the electrode housing, and are communicated through a tapered flow channel part.

[0014] Preferably, the connecting member is tubular, and the ventilation assembly is disposed in the lumen of the connecting member.

[0015] Preferably, the electrode housing is connected to the control processing device through a wire, and the wire is coated with an insulating layer.

[0016] Preferably, the optical scattering detection system includes an optical component and a photodetector. The optical component is disposed inside the electrode housing, and the photodetector is disposed inside the shaft and is communicatively connected to the control processing device.

[0017] Preferably, the electrode housing is indirectly connected to the control processing device through a first signal amplification module.

[0018] The present invention also provides an information fusion method for the composite detection type optical dust detector, including the following steps:

[0019] S1, set a preset flow rate value V0 and a preset flow rate value V1, where the preset flow rate value V1 is greater than the preset flow rate value V0; set 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;

[0020] S2, the optical scattering detection system measures a first dust concentration value C1, the charge induction detection system measures a second dust concentration value C2, and the differential pressure detection system measures a flow rate value V;

[0021] S3, the control processing device obtains the first dust concentration value C1, the second dust concentration value C2, and the flow rate value V;

[0022] S4. When V < V0, the weight value of C1 is X1, and the weight value of C2 is Y1, where X1 + Y1 = 100; when V0 ≤ V ≤ V1, the weight of C1 is X2, and the weight of C2 is Y2, where X2 + Y2 = 100; when V > V1, the weight of C1 is X3, and the weight of C2 is Y3, where X3 + Y3 = 100; the final dust concentration value is (C1·X + C2·Y) / 100, where X and Y are the weight values corresponding to the flow velocity value V respectively.

[0023] 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 detector emits an alarm signal and sets the weight value corresponding to the abnormal dust concentration value to zero.

[0024] As described above, the composite detection type optical dust detector and the information fusion method of the present invention have the following beneficial effects: In the present invention, the composite detection type optical dust detector includes an optical scattering detection system, a charge induction detection system, and a differential pressure detection system, and can measure two dust concentration values and one flow velocity value. The electrode housing insulator is sleeved on the rod head, and the electrode housing is communicatively connected with the control processing device; the variable cross-section flow channel is arranged through the electrode housing, and the differential pressure sensor is respectively communicated with the large-diameter flow channel part and the small-diameter flow channel part through the ventilation assembly. The present invention integrates multiple detection ends at the rod head, that is, on the basis of the original optical dust detector, by adding very few components, it adds a flow velocity measurement function and a charge method dust measurement function. It can not only provide various data related to the dust concentration of the measured gas, but also provide a strong guarantee for the reliability and accuracy of the dust concentration value. The composite detection type optical dust detector of the present invention integrates the optical scattering detection system, the charge induction detection system, and the differential pressure detection system on the probe rod, with a compact overall structure, low maintenance and manufacturing costs, and provides a strong guarantee for the reliability and accuracy of the dust concentration value. In addition, the information fusion method of the present invention can improve the reliability and accuracy of the final dust concentration value. Description of the Drawings

[0025] Figure 1 Shows a perspective view of the composite detection type optical dust detector of the present invention;

[0026] Figure 2 Shows a cross-sectional view of the composite detection type optical dust detector of the present invention;

[0027] Figure 3 Shows Figure 2 An enlarged view of part A in

[0028] Figure 4Shown is a schematic connection diagram of an optical scattering detection system, a charge induction detection system, a differential pressure detection system, and a control and processing device.

[0029] Component label description

[0030] 1 Control and processing device

[0031] 2 Probe rod

[0032] 21 Rod body

[0033] 22 Rod head

[0034] 221 Insulating flange

[0035] 23 Connector

[0036] 24 Gas detection area

[0037] 3 Optical scattering detection system

[0038] 31 Optical component

[0039] 32 Photoelectric detector

[0040] 33 Light source

[0041] 34 Second signal amplification module

[0042] 35 Second signal acquisition module

[0043] 4 Charge induction detection system

[0044] 41 Electrode housing

[0045] 42 First signal amplification module

[0046] 43 First signal acquisition module

[0047] 5 Differential pressure detection system

[0048] 51 Variable cross-section flow channel

[0049] 511 Large-diameter flow channel part

[0050] 512 Small-diameter flow channel part

[0051] 513 Tapered flow channel part

[0052] 52 Ventilation component

[0053] 521 High-pressure ventilation pipe

[0054] 522 Low-pressure ventilation pipe

[0055] 53 Differential pressure sensor

[0056] 54 Third signal acquisition module Specific implementation manner

[0057] The following specific embodiments illustrate the implementation manners of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification.

[0058] It should be noted that the structures, ratios, sizes, etc. shown in the drawings of this specification are only used to cooperate with the content disclosed in the specification for those skilled in the art to understand and read, and are not used to limit the limiting conditions for the implementation of the present invention. Therefore, they do not have any technical essence. Any modification of the structure, change of the proportional relationship or adjustment of the size, without affecting the effects that the present invention can produce and the purposes that can be achieved, should still fall within the scope covered by the technical content disclosed in the present invention. At the same time, the terms such as "upper", "lower", "left", "right", "middle" and "one" cited in this specification are only for the convenience of clear narration, and are not used to limit the scope for the implementation of the present invention. The change or adjustment of their relative relationships, without substantial change in the technical content, should also be regarded as the scope within which the present invention can be implemented.

[0059] Figure 3 In the figure, the X direction is the flow direction of the measured gas (such as flue gas).

[0060] As Figure 1 、 Figure 2 、 Figure 3 and Figure 4 shown, the present invention provides a composite detection type optical dust detector, including:

[0061] A control processing device 1;

[0062] A probe rod 2, the probe rod 2 includes a rod body 21 and a rod head 22. The rod head 22 is coaxially connected to the rod body 21 through a connector 23. The space between the rod body 21 and the rod head 22 forms a gas detection area 24;

[0063] An optical scattering detection system 3, the optical scattering detection system 3 is arranged on the probe rod 2 and is communicatively connected to the control processing device 1;

[0064] A charge induction detection system 4, the charge induction detection system 4 includes an electrode housing 41. The electrode housing 41 is insulatingly sleeved on the rod head 22, and the electrode housing 41 is communicatively connected to the control processing device 1;

[0065] The differential pressure detection system 5 includes a variable cross-section flow channel 51, a ventilation component 52, and a differential pressure sensor 53. The variable cross-section flow channel 51 is disposed through the electrode housing 41. The variable cross-section flow channel 51 includes a large-diameter flow channel portion 511 and a small-diameter flow channel portion 512. The differential pressure sensor 53 is respectively communicated with the large-diameter flow channel portion 511 and the small-diameter flow channel portion 512 through the ventilation component 52. The differential pressure sensor 53 is communicatively connected to the control processing device 1.

[0066] In the present invention, the composite detection type optical dust meter includes an optical scattering detection system 3, a charge induction detection system 4, and a differential pressure detection system 5, and can measure two dust concentration values and one flow velocity value. The three measurement principles are as follows:

[0067] Measurement principle of the flow velocity of the measured gas: The variable cross-section flow channel 51 is disposed through the electrode housing 41. When the measured gas flows from the large-diameter flow channel portion 511 to the small-diameter flow channel portion 512, the pressure of the measured gas will increase, that is, there is a pressure difference between the pressure in the large-diameter flow channel portion 511 and the pressure in the small-diameter flow channel portion 512. The pressure difference is related to the flow velocity of the measured gas. The flow velocity of the measured gas is obtained through the existing calculation formula: V = k·sqrt(ΔP / ρ), where V is the flow velocity value of the measured gas, k is a correction coefficient, ΔP is the pressure difference, and ρ is the mass density of the measured gas. In order to obtain the pressure difference between the pressure in the large-diameter flow channel portion 511 and the pressure in the small-diameter flow channel portion 512, the differential pressure sensor 53 is respectively communicated with the large-diameter flow channel portion 511 and the small-diameter flow channel portion 512 through the ventilation component 52.

[0068] Measurement principle of the charge method dust concentration value of the measured gas: Dust particles will generate charges when rubbing against each other during movement. The generated charge quantity is linearly related to the concentration of dust particles. When the charges in the measured gas approach the electrode housing 41, a micro induction current will be generated on the electrode housing 41. The friction between the dust particles and the electrode housing 41 will also generate a micro current. These micro currents are amplified and processed and converted into a dust concentration value. The conversion method between the current value and the dust concentration value is an existing method.

[0069] Measurement principle of the scattering method dust concentration value of the measured gas: During detection, when light irradiates the gas to be measured flowing through the gas detection area 24, scattering will occur. The optical scattering detection system 3 detects the scattered light intensity of the light and converts the scattered light intensity into an electrical signal. The electrical signal is proportional to the dust concentration value of the measured gas. The conversion method between the electrical signal and the dust concentration value is an existing method.

[0070] More importantly, an insulating cover of the electrode housing 41 is sleeved on the rod head 22, and the electrode housing 41 is communicatively connected with the control processing device 1; the variable cross-section flow channel 51 is disposed through the electrode housing 41, and the air pressure difference sensor 53 is respectively communicated with the large-diameter flow channel portion 511 and the small-diameter flow channel portion 512 through the ventilation assembly 52. The present invention integrates multiple detection ends at the rod head 22, that is, on the basis of the original optical dust detector, through very few components, a flow velocity measurement function and a charge method dust measurement function are added thereto. It can not only provide various data related to the dust concentration of the measured gas, but also provide strong guarantee for the reliability and accuracy of the dust concentration value.

[0071] Therefore, the composite detection type optical dust detector of the present invention 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. The overall structure is compact, the maintenance and manufacturing costs are low, and strong guarantee is provided for the reliability and accuracy of the dust concentration value.

[0072] In order to simplify the structure of the above ventilation assembly 52, the ventilation assembly 52 includes 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 channel portion 512 and the other end 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 channel portion 511 and the other end is communicated with the air pressure difference sensor 53.

[0073] The above electrode housing 41 is made of a conductive material, such as stainless steel material, and the stainless steel material can be 316 stainless steel. In order to protect the above rod head 22, the electrode housing 41 can also be used as the outer shell structure of the rod head 22.

[0074] As Figure 1 and Figure 3 shown, in order to prevent the charge on the above electrode housing 41 from transferring to the rod head 22, the above rod head 22 includes an insulating flange 221, and the insulating flange 221 is connected with the connecting member 23; the above electrode housing 41 has a one-way opening and the opening of the electrode housing 41 is connected with the insulating flange 221. Specifically, the insulating flange 221 is made of an insulating material, such as polyether ether ketone (PEEK). Polyether ether ketone is a semi-crystalline polymer material with good high-temperature resistance, a high-temperature resistance value of up to more than 300 °C, mechanical properties comparable to those of alloy materials, and at the same time, it is also a high-quality electrical insulating material.

[0075] As Figure 3 shown, in order to facilitate the manufacture of the above electrode housing 41 and the variable cross-section flow channel 51, the above electrode housing 41 is in a cylindrical shape, the large-diameter flow channel portion 511 and the small-diameter flow channel portion 512 are oppositely arranged on the electrode housing 41 along the diameter direction of the electrode housing 41, and the large-diameter flow channel portion 511 and the small-diameter flow channel portion 512 are communicated through a tapered flow channel portion 513.

[0076] To make the structure of the above compound detection type optical dust detector more compact and protect the above ventilation component 52, the above connecting piece 23 is tubular, and the above ventilation component 52 is disposed in the lumen of the connecting piece 23.

[0077] To improve the accuracy of the charge method for measuring dust concentration, the above electrode housing 41 is connected to the control and processing device 1 through a wire, and the wire is coated with an insulating layer. In addition, the wire can also be disposed in the lumen of the connecting piece 23, which not only improves the service life of the wire but also makes the structure of the above compound detection type optical dust detector more compact.

[0078] To further improve the integration of the above compound detection type optical dust detector, the above 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 rod body 21 and is communicatively connected to the control and processing device 1. In addition, the optical scattering detection system 3 further includes a light source 33 (such as a laser emitter), a second signal amplification module 34, and a second signal acquisition module 35. Working principle: The light source 33 emits a light beam. After the light beam passes through the gas detection area 24, it is projected onto the optical component 31. The optical component 31 reflects the light beam to the photodetector 32. The photodetector 32 generates an electrical signal. The electrical signal sequentially passes through the second signal amplification module 34 and the second signal acquisition module 35 (the second signal acquisition module 35 can be an analog-to-digital conversion module), and finally is transmitted to the control and processing device 1.

[0079] To amplify and process the current value, the above electrode housing 41 is indirectly connected to the control and processing device 1 through a first signal amplification module 42. The charge induction detection system 4 further includes a first signal acquisition module 43 (the first signal acquisition module 43 can be an analog-to-digital conversion module). The first signal amplification module 42 is indirectly connected to the control and processing device 1 through the first signal acquisition module 43, which is convenient for the control and processing device 1 to analyze and process.

[0080] To facilitate the analysis and processing by the control and processing device 1, the air pressure difference detection system further includes a third signal acquisition module 54. The air pressure difference sensor 53 is indirectly connected to the control and processing device 1 through the third signal acquisition module 54 (the third signal acquisition module 54 can be an analog-to-digital conversion module).

[0081] The above control and processing device 1 includes a controller, and the controller is one of ARM, MCU, FPGA, and PLC.

[0082] The present invention also provides an information fusion method for the above compound detection type optical dust detector, including the following steps:

[0083] S1. Set a preset flow rate value V0 and a preset flow rate value V1, where the preset flow rate value V1 is greater than the preset flow rate value V0; set 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.

[0084] S2. The optical scattering detection system 3 measures a first dust concentration value C1, the charge induction detection system 4 measures a second dust concentration value C2, and the pressure difference detection system 5 measures a flow rate value V.

[0085] S3. The control processing device 1 obtains the first dust concentration value C1, the second dust concentration value C2, and the flow rate value V.

[0086] S4. When V < V0, the weight value of C1 is X1, the weight value of C2 is Y1, and X1 + Y1 = 100; when V0 ≤ V ≤ V1, the weight of C1 is X2, the weight of C2 is Y2, and X2 + Y2 = 100; when V > V1, the weight of C1 is X3, the weight of C2 is Y3, and X3 + Y3 = 100; the final dust concentration value is (C1·X + C2·Y) / 100, where X and Y are the weight values corresponding to the flow rate value V respectively.

[0087] The information fusion method of the present invention can improve the reliability and accuracy of the final dust concentration value.

[0088] 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 and 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, and the composite detection type optical dust meter emits an alarm signal, and the weight value corresponding to the abnormal dust concentration value is set to zero.

[0089] As a specific measurement result of the above information fusion method:

[0090] According to the influence of the actual flow rate value on the dust concentration value of the flue gas, the parameters are set as follows:

[0091] The preset flow rate value V0 is 7 m / s, and the preset flow rate value V1 is 20 m / s; the weight value X1 is 100, the weight value Y1 is 0; the weight value X2 is 50, the weight value Y2 is 50; the weight value X3 is 20, and the weight value Y3 is 80.

[0092] When V is lower than 7 m / s, if C1 = 10 mg / m 3 , C2 = 20 mg / m 3 , then the final dust concentration value is 10 mg / m 3 .

[0093] When V exceeds 20 m / s, if C1 = 10 mg / m3 , C2 = 20 mg / m 3 , then the final dust concentration value is 11.2 mg / m 3 .

[0094] When V is between 7 m / s and 20 m / s, if C1 = 10 mg / m 3 , C2 = 20 mg / m 3 , then the final dust concentration value is 8.5 mg / m 3 .

[0095] Abnormal situation: If C1 = 10 mg / m 3 , C2 = 100 mg / m 3 , then C2 = 100 mg / m 3 is an abnormal dust concentration value, Y is set to zero, and the final dust concentration value is 10 mg / m 3 .

[0096] In summary, the present invention can integrate an optical scattering detection system, a charge induction detection system, and a differential pressure detection system on a probe rod, with a compact overall structure, low maintenance and manufacturing costs, and improved reliability and accuracy of the dust concentration value of the measured gas. Therefore, the present invention effectively overcomes various disadvantages in the prior art and has high industrial utilization value.

[0097] The above embodiments are only illustrative of the principles and effects of the present invention and are not intended to limit the present invention. Any person familiar with this technology can modify or change the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or changes made by those with ordinary knowledge in the technical field without departing from the spirit and technical idea disclosed by the present invention should still be covered by the claims of the present invention.

Claims

1. A composite detection type optical dust detector, characterized in that include: Control processing device (1); A probe rod (2), the probe rod (2) comprising a rod body (21) and a rod head (22), the rod head (22) being coaxially connected to the rod body (21) via a connecting piece (23), and the space between the rod body (21) and the rod head (22) forming a gas detection area (24); An 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); A charge induction detection system (4), the charge induction detection system (4) comprising an electrode housing (41), an insulating cover of the electrode housing (41) being arranged on the rod head (22), and the electrode housing (41) being communicatively connected with the control processing device (1); An air pressure difference detection system (5), the air pressure difference detection system (5) comprising a variable cross-section flow channel (51), a ventilation component (52) and an air pressure difference sensor (53), the variable cross-section flow channel (51) being arranged through the electrode housing (41), the variable cross-section flow channel (51) comprising a large-diameter flow channel portion (511) and a small-diameter flow channel portion (512), the air pressure difference sensor (53) being respectively connected to the large-diameter flow channel portion (511) and the small-diameter flow channel portion (512) through the ventilation component (52), and the air pressure difference sensor (53) being communicatively connected to the control processing device (1); The electrode shell (41) is cylindrical, the large-diameter flow channel portion (511) and the small-diameter flow channel portion (512) are arranged relatively to the electrode shell (41) along the diameter direction of the electrode shell (41), and the large-diameter flow channel portion (511) and the small-diameter flow channel portion (512) are connected via a tapered flow channel portion (513); The connecting piece (23) is tubular, and the ventilation component (52) is arranged in the tubular cavity of the connecting piece (23).

2. The composite detection type optical dust meter according to claim 1, wherein: 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 connected to the small-diameter flow channel (512) and the other end is connected to the air pressure difference sensor (53); one end of the low-pressure ventilation pipe (522) is connected to the large-diameter flow channel (511) and the other end is connected to the air pressure difference sensor (53).

3. The composite detection optical dust meter according to claim 1, wherein: The rod head (22) comprises an insulating flange (221), and the insulating flange (221) is connected to the connecting piece (23); the electrode shell (41) is open in one direction, and the opening of the electrode shell (41) is connected to the insulating flange (221).

4. The composite detection optical dust meter according to claim 1, wherein: The electrode shell (41) is connected to the control processing device (1) via a wire, and the wire is coated with an insulating layer.

5. The composite detection type optical dust meter according to claim 1, wherein: The optical scattering detection system (3) comprises an optical component (31) and a photodetector (32), wherein the optical component (31) is arranged in an electrode housing (41), and the photodetector (32) is arranged in a shaft (21) and is communicatively connected to a control processing device (1).

6. The composite detection type optical dust meter according to claim 1, characterized in that: The electrode housing (41) is indirectly connected to the control processing device (1) via a first signal amplification module (42).

7. An information fusion method for a composite detection optical dust instrument according to any one of claims 1 to 6, characterized in that: The following steps are involved: S1, Set the preset flow rate value V0 and the preset flow rate value V1, where the preset flow rate value V1 is greater than the preset flow rate value V0; set the weight value X1, the weight value Y1, the weight value X2, the weight value Y2, the weight value X3, and the weight value Y3; S2, The optical scattering detection system (3) measures the first dust concentration value C1, the charge induction detection system (4) measures the second dust concentration value C2, and the pressure difference detection system (5) measures the flow rate value V; S3, The control processing device (1) obtains the first dust concentration value C1, the second dust concentration value C2, and the flow rate value V; S4, When V < V0, the weight value of C1 is X1, the weight value of C2 is Y1, and X1 + Y1 = 100; when V0 ≤ V ≤ V1, the weight of C1 is X2, the weight of C2 is Y2, and X2 + Y2 = 100; when V > V1, the weight of C1 is X3, the weight of C2 is Y3, and X3 + Y3 = 100; the final dust concentration value is (C1·X + C2·Y) / 100, where X and Y are the weight values corresponding to the flow rate value V respectively.

8. The information fusion method according to claim 7, wherein: In step S4, set the preset ratio range. When the ratio of the first dust concentration value C1 and the second dust concentration value C2 does not belong to the preset ratio range, determine that one of the first dust concentration value C1 and the second dust concentration value C2 is an abnormal dust concentration value, and the composite detection type optical dust meter emits an alarm signal and sets the weight value corresponding to the abnormal dust concentration value to zero.

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