Dust concentration measuring device

Abstract

The invention relates to a dust concentration measuring device which comprises a flue gas pipeline system, a flue gas concentration measuring system, a flue gas heating system, a flue flow velocity measuring system, a measuring chamber flow velocity measuring system, a measuring chamber flow velocity control system and a valve control system. The flue gas concentration measuring system is used for measuring the dust concentration of flue gas entering the device, and the flue gas heating system is used for heating the flue gas entering the device so as to remove moisture in dust, maintain the flue gas temperature and eliminate the influence of the dust humidity and the flue gas temperature on a measurement result; the flue gas flow velocity measuring system measures the flue gas flow velocity in the flue, the measuring chamber flow velocity measuring system detects the flue gas flow velocity in the measuring chamber, and the measuring chamber flow velocity control system is combined to adjust the flue gas flow velocity in the measuring chamber to ensure that the flue gas flow velocity in the measuring chamber is consistent with the flue gas flow velocity in the flue so as to eliminate the influence of the flue gas flow velocity on the measuring result. The valve control system can achieve a self-cleaning function, and dust particles are prevented from blocking a pipeline after the device is used for a long time.

Description

Technical Field

[0001] The invention relates to the technical field of dust concentration measurement, and in particular to a dust concentration measuring device. Background Art

[0002] At present, the existing dust concentration measuring devices are unable to detect relatively small dust particles, and have low measurement sensitivity and accuracy, and are unable to accurately measure the dust concentration in the flue gas; the anti-interference ability is low, high temperature may cause sensor performance to decline, humidity changes may cause measurement errors, etc., resulting in deviations in the measurement results; and the existing dust concentration measuring devices do not have a self-cleaning function. After long-term use, smoke dust is easy to adhere to the probe, resulting in a decrease in measurement accuracy. The equipment needs to be cleaned regularly, which increases the equipment maintenance cost. Summary of the invention

[0003] In view of the above-mentioned shortcomings of the prior art, an object of the present invention is to provide a dust concentration measuring device to solve the problem of low measurement accuracy of the existing dust concentration measuring devices.

[0004] To achieve the above-mentioned object and other related objects, the present invention provides a dust concentration measuring device, comprising:

[0005] A flue gas pipeline system, comprising an air inlet pipe and an exhaust pipe, wherein the air inlet pipe is used to introduce the flue gas in the flue into the device, and the exhaust pipe is used to discharge the flue gas in the device;

[0006] A flue gas concentration measurement system, comprising a measurement chamber and an optical path measurement module, wherein the measurement chamber is connected to the air inlet pipe and the exhaust pipe, and the optical path measurement module is used to measure the flue gas dust concentration in the measurement chamber;

[0007] A flue gas heating system, comprising a dehumidification heating module and a constant temperature heating module, wherein the dehumidification heating module is used to heat the flue gas in the air inlet pipe, and the constant temperature heating module is used to heat the flue gas in the measuring chamber;

[0008] Flue flow velocity measurement system, used to detect the flue gas velocity in the flue;

[0009] A measuring chamber flow rate measuring system, used to detect the flue gas flow rate in the measuring chamber;

[0010] A flow rate control system for the measuring chamber, comprising a jet pump and a needle valve, wherein the jet pump is in communication with the exhaust pipe and the needle valve, the needle valve is connected to an air source, the needle valve is used to adjust the air intake flow rate of the jet pump to adjust the exhaust flow rate of the smoke in the measuring chamber, and the jet pump is used to provide power for exhausting the smoke in the measuring chamber;

[0011] The valve control system is connected to the flue flow velocity measurement system, the measuring chamber flow velocity measurement system and the gas source. When the device is in a measuring state, the valve control system is connected to the flue flow velocity measurement system and the measuring chamber flow velocity measurement system and is disconnected from the gas source. When the device is in a purge state, the valve control system is connected to the flue flow velocity measurement system, the measuring chamber flow velocity measurement system and the gas source.

[0012] Optionally, the measurement chamber includes a smoke cavity, a first air curtain cavity and a second air curtain cavity;

[0013] The air inlet pipe and the exhaust pipe are both connected to the smoke cavity, and both ends of the smoke cavity along the axial direction are provided with through holes for passing the light beam, and the first air curtain cavity is provided with window sheets corresponding to the through holes;

[0014] The first air curtain cavity and the second air curtain cavity are respectively arranged at two ends of the smoke cavity along the axial direction. The smoke cavity is provided with a passage connecting the first air curtain cavity and the second air curtain cavity along the axial direction. The first air curtain cavity is connected to an air source.

[0015] Optionally, the optical path measurement module includes a light source, a beam splitter prism, an optical path switching mechanism, a light trap, an adjustable reflector assembly, a converging lens and an optical fiber;

[0016] The light source, the beam splitter prism, the optical path switching mechanism, and the light trap are sequentially arranged linearly, the light source, the beam splitter prism, and the optical path switching mechanism are located outside the measuring room, and the light trap is located inside the second air curtain cavity;

[0017] The adjustable reflector assembly is arranged in parallel above the beam splitter prism and outside the measuring chamber. The converging lens and the optical fiber are located in the second air curtain cavity, and the converging lens and the adjustable reflector assembly are arranged linearly.

[0018] Optionally, the dehumidification and heating module includes a heating plate and a heating rod, and the constant temperature heating module is arranged on the outer wall of the smoke cavity.

[0019] Optionally, the flue flow rate measurement system includes a total pressure taking tube, a static pressure taking tube, a flue differential pressure sensor and a temperature probe. The pressure taking port of the total pressure taking tube is arranged relative to the flow direction of the flue gas, and the pressure taking port of the static pressure taking tube is arranged in the same direction as the flow direction of the flue gas. The total pressure taking tube is used to measure the total flue pressure, the static pressure taking tube is used to measure the static pressure of the flue, the flue differential pressure sensor is used to measure the difference between the total flue pressure and the static pressure of the flue, and the temperature probe is used to detect the flue gas temperature in the flue.

[0020] Optionally, the measuring chamber flow rate measurement system includes a total pressure pressure measuring joint, a static pressure pressure measuring joint and a smoke chamber differential pressure sensor, the total pressure pressure measuring joint is used to detect the total pressure of the smoke chamber, the static pressure pressure measuring joint is used to detect the static pressure of the smoke chamber, and the smoke chamber differential pressure sensor is used to measure the difference between the total pressure of the smoke chamber and the static pressure of the smoke chamber.

[0021] Optionally, the jet pump includes a first air inlet, a second air inlet and an exhaust port, the first air inlet is connected to the exhaust pipe, the second air inlet is connected to the needle valve, and the exhaust port is connected to the first air inlet and the second air inlet.

[0022] Optionally, the needle valve comprises a base, a needle valve seat, a valve stem, a valve sleeve and a valve stem drive motor;

[0023] The base is provided with an air inlet joint and an air outlet joint staggered along the axial direction of the valve stem, the air inlet joint is connected to the air source, and the air outlet joint is connected to the second air inlet of the jet pump, the base is provided with a mounting cavity, the needle valve seat is installed in the mounting cavity, and blocks the mounting cavity and the base to form an air cavity, the base is provided with a connecting port, the air inlet joint, the air cavity and the air outlet joint are connected through the connecting port, and the connecting port is in an inverted cone shape;

[0024] The valve stem is threadedly connected to the needle valve seat, and the valve stem is connected to the valve stem drive motor through a valve sleeve. The valve stem drive motor is used to drive the valve stem to move along its axial direction. The valve stem is provided with a tapered portion, and the tapered portion is used to cooperate with the connecting port to adjust the opening of the connecting port so as to adjust the air intake of the jet pump.

[0025] Optionally, the valve control system includes a buffer chamber, a solenoid valve seat, a flue full-pressure solenoid valve, a flue static-pressure solenoid valve, a flue gas chamber full-pressure solenoid valve, and a flue gas chamber static-pressure solenoid valve;

[0026] The solenoid valve seat is provided with a gas source passage, a flue full-pressure output port, a flue static-pressure output port, a flue gas cavity full-pressure output port, and a flue gas cavity static-pressure output port;

[0027] The gas source passage is in communication with the gas source, the buffer chamber is in communication with the gas source passage, and a pressure relief port is provided on the buffer chamber;

[0028] The flue total pressure output port and the flue static pressure output port are connected to the flue differential pressure sensor;

[0029] The smoke chamber total pressure output port and the smoke chamber static pressure output port are connected to the smoke chamber differential pressure sensor;

[0030] The flue full-pressure solenoid valve is connected to the full-pressure pressure-taking pipe, and the full-pressure pressure-taking pipe is connected to the flue differential pressure sensor or connected to the gas source passage through the flue full-pressure solenoid valve;

[0031] The flue static pressure solenoid valve is in communication with the static pressure taking pipe, and the static pressure taking pipe is connected to the flue differential pressure sensor or is in communication with the gas source passage through the flue static pressure solenoid valve;

[0032] The smoke chamber full-pressure solenoid valve is connected to the full-pressure pressure measuring joint, and the full-pressure pressure measuring joint is connected to the smoke chamber differential pressure sensor or connected to the gas source passage through the smoke chamber full-pressure solenoid valve;

[0033] The smoke chamber static pressure solenoid valve is connected to the static pressure measuring joint, and the static pressure measuring joint is connected to the smoke chamber differential pressure sensor or the gas source passage through the smoke chamber static pressure solenoid valve;

[0034] When the device is in a measuring state, the total pressure taking pipe is connected to the flue differential pressure sensor through the flue total pressure solenoid valve, the static pressure taking pipe is connected to the flue differential pressure sensor through the flue static pressure solenoid valve, the total pressure measuring joint is connected to the flue differential pressure sensor through the flue total pressure solenoid valve, and the static pressure measuring joint is connected to the flue differential pressure sensor through the flue static pressure solenoid valve;

[0035] When the device is in a cleaning state, the total pressure taking pipe is connected to the gas source passage through the flue total pressure solenoid valve, the static pressure taking pipe is connected to the gas source passage through the flue static pressure solenoid valve, the total pressure measuring joint is connected to the gas source passage through the flue gas chamber total pressure solenoid valve, and the static pressure measuring joint is connected to the gas source passage through the flue gas chamber static pressure solenoid valve.

[0036] Optionally, a light source heat dissipation system is further included, wherein the heat dissipation system is used to cool the light source, and the light source heat dissipation system includes a heat dissipation fan and a heat dissipation channel arranged around the light source, and the heat dissipation channel is connected to an air source.

[0037] As described above, the present invention has the following beneficial effects: the flue gas in the flue is introduced into and discharged from the measuring chamber through the flue pipe system, and the flue gas dust concentration in the measuring chamber is detected through the optical path measurement module. Compared with the traditional flue gas dust concentration measurement method, the measurement precision and accuracy are effectively improved, and the dust in the flue gas entering the measuring chamber is heated and dehumidified by the dehumidification heating module, thereby eliminating the influence of dust humidity on the measurement results; the flue gas dust in the measuring chamber is heated by the constant temperature heating module to ensure that the flue gas dust temperature in the measuring chamber is consistent with the flue gas dust temperature in the flue, thereby avoiding the problem that the temperature change causes the change in dust particle size to affect the measurement results; the flue gas flow rate in the flue is measured by the flue flow rate measurement system, and the measuring chamber flow rate measurement system detects the flow rate of the flue gas in the measuring chamber. In combination with the measuring chamber flow rate control system, the air intake of the jet pump is adjusted by the needle valve to adjust the external exhaust flow rate of the measuring chamber, thereby adjusting the flue gas flow rate in the measuring chamber, ensuring that the flue gas flow rate in the measuring chamber is consistent with the flue gas flow rate in the flue, thereby eliminating the influence of the flue gas flow rate on the measurement results. The valve control system can realize the self-cleaning function of the device, so as to avoid dust particles clogging the pipeline after the device is used for a long time, and can effectively reduce the labor intensity of manual cleaning. Therefore, the present application measures the flue gas dust concentration through the optical path measurement module, and combines the flue gas heating system, the flue flow rate measurement system, the measuring room flow rate measurement system and the measuring room flow rate control system, which can effectively improve the accuracy of the measurement results, improve the measurement accuracy of the flue gas dust concentration, and has a self-cleaning function, which can effectively reduce the labor intensity of personnel. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 Shown is a schematic diagram of the structure of a dust concentration measuring device shown in an embodiment of the present application;

[0039] Figure 2 Shown is a structural schematic diagram of a flue gas pipeline system shown in an embodiment of the present application;

[0040] Figure 3 Shown is a schematic cross-sectional structure diagram of a measurement chamber and an optical path measurement module shown in an embodiment of the present application;

[0041] Figure 4 Display as Figure 3 Schematic diagram of the cross-sectional structure of the central collector wafer;

[0042] Figure 5 Display as Figure 3 A schematic diagram of the structure of the optical path switching mechanism;

[0043] Figure 6 Display as Figure 3 A schematic diagram of the structure of the adjustable reflector assembly;

[0044] Figure 7Shown is a structural schematic diagram of a constant temperature heating module shown in an embodiment of the present application;

[0045] Figure 8 Shown is a schematic cross-sectional structure diagram of a flow rate measurement system for a measurement chamber according to an embodiment of the present application;

[0046] Fig. 9 Shown is a schematic cross-sectional structure diagram of a needle valve shown in an embodiment of the present application;

[0047] Fig.10 Shown is a schematic diagram of the structure of a valve control system shown in an embodiment of the present application;

[0048] Fig.11 Display as Fig.10 Schematic diagram of the cross-sectional structure of the valve control system.

[0049] Description of Reference Numerals

[0050] Smoke pipeline system 1, air intake pipe 101, sampling section 101a, detachable section 101b, fixed section 101c, air intake branch pipe 101d, drain pipe 101e, exhaust pipe 102, measuring chamber 2, smoke cavity 201, through hole 201a, channel 201b, observation window 201c, first air curtain cavity 202, second air curtain cavity 203, window sheet 204, current collecting sheet 205, current collecting channel 205a, optical path measurement module 3, light source 301, spectroscopic prism 3 02, optical path switching mechanism 303, switching motor 303a, gear set 303b, baffle 303c, light trap 304, adjustable reflector assembly 305, converging lens 306, optical fiber 307, dehumidification and heating module 4, heating plate 401, heating rod 402, constant temperature heating module 5, flue flow rate measurement system 6, full pressure taking tube 601, static pressure taking tube 602, flue differential pressure sensor 603, temperature probe 604, measurement room flow rate measurement system 7 ... Pressure measuring joint 701, static pressure measuring joint 702, jet pump 8, first air inlet 801, second air inlet 802, air outlet 803, needle valve 9, base 901, air inlet joint 901a, air outlet joint 901b, air cavity 901c, connecting port 901d, needle valve seat 902, valve stem 903, valve sleeve 904, limit plate 904a, valve stem drive motor 905, buffer chamber 10, pressure relief port 1001, solenoid valve seat 11, air source passage 1 101, flue full-pressure output port 1102, flue static pressure output port 1103, smoke chamber full-pressure output port 1104, smoke chamber static pressure output port 1105, flue full-pressure solenoid valve 12, flue static pressure solenoid valve 13, smoke chamber full-pressure solenoid valve 14, smoke chamber static pressure solenoid valve 15, cooling fan 16, cooling channel 17, flange connector 18, mounting seat 19, upper limit sensor 20, lower limit sensor 21, window cleaning solenoid valve 22. DETAILED DESCRIPTION

[0051] The following describes the embodiments of the present invention through specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention.

[0052] See also Figures 1 to 11 It should be noted that the diagrams provided in the present embodiment only illustrate the basic concept of the present invention in a schematic manner, so the diagrams only show the components related to the present invention rather than drawing according to the number, shape and size of the components in actual implementation. The type, quantity and proportion of each component in actual implementation can be changed at will, and the component layout type may also be more complicated. The structure, proportion, size, etc. shown in the drawings attached to this specification are only used to match the content disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the limiting conditions that the present invention can be implemented, so they have no technical substantive significance. Any modification of the structure, change of the proportional relationship or adjustment of the size should still fall within the scope of the technical content disclosed by the present invention without affecting the effect and purpose that the present invention can produce. At the same time, the terms such as "upper", "lower", "left", "right", "middle" and "one" quoted in this specification are only for the convenience of description, and are not used to limit the scope of the implementation of the present invention. The change or adjustment of the relative relationship should also be regarded as the scope of the implementation of the present invention without substantially changing the technical content.

[0053] Before describing the embodiments of the present invention in detail, the application environment of the present invention is described first. The technology of the present invention is mainly applied to the field of dust concentration measurement technology. The present invention is used to solve the problem of low measurement accuracy of existing dust concentration measurement devices.

[0054] Please combine Figures 1 to 11 As shown, the present invention provides a dust concentration measuring device.

[0055] In an exemplary embodiment of the present application, the dust concentration measuring device comprises: a flue gas pipeline system 1, comprising an air intake pipe 101 and an exhaust pipe 102, the air intake pipe 101 is used to introduce the flue gas in the flue into the device, and the exhaust pipe 102 is used to exhaust the flue gas in the device;

[0056] The flue gas concentration measurement system includes a measurement chamber 2 and an optical path measurement module 3. The measurement chamber 2 is connected to the air inlet pipe 101 and the exhaust pipe 102. The optical path measurement module 3 is used to measure the flue gas dust concentration in the measurement chamber 2.

[0057] The flue gas heating system includes a dehumidification heating module 4 and a constant temperature heating module 5. The dehumidification heating module 4 is used to heat the flue gas in the air inlet pipe 101, and the constant temperature heating module 5 is used to heat the flue gas in the measuring chamber 2;

[0058] Flue flow velocity measuring system 6, used to detect the flue gas flow velocity in the flue;

[0059] The measuring chamber flow rate measuring system 7 is used to detect the flue gas flow rate in the measuring chamber 2;

[0060] The flow rate control system of the measuring chamber 2 includes a jet pump 8 and a needle valve 9. The jet pump 8 is connected to the exhaust pipe 102 and the needle valve 9. The needle valve 9 is connected to the air source. The needle valve 9 is used to adjust the air intake flow of the jet pump 8 to adjust the exhaust flow rate of the smoke in the measuring chamber 2. The jet pump 8 is used to provide power for the exhaust of the smoke in the measuring chamber 2.

[0061] The valve control system is connected to the flue flow velocity measurement system 6, the measuring room flow velocity measurement system 7 and the gas source. When the device is in the measuring state, the valve control system is connected to the flue flow velocity measurement system 6 and the measuring room flow velocity measurement system 7 and is disconnected from the gas source. When the device is in the purge state, the valve control system is connected to the flue flow velocity measurement system 6, the measuring room flow velocity measurement system 7 and the gas source.

[0062] In this embodiment, the flue gas in the flue is introduced into and discharged from the measuring chamber 2 through the flue gas pipeline system 1, and the flue gas dust concentration in the measuring chamber 2 is detected by the optical path measurement module 3. Compared with the traditional flue gas dust concentration measurement method, the measurement precision and accuracy are effectively improved. The dust in the flue gas entering the measuring chamber 2 is heated and dehumidified by the dehumidification heating module 4, thereby eliminating the influence of dust humidity on the measurement result; the flue gas dust in the measuring chamber 2 is heated by the constant temperature heating module 5, thereby ensuring that the flue gas dust temperature in the measuring chamber 2 is consistent with the flue gas dust in the flue gas. The flue gas dust temperature is consistent, avoiding the problem that the dust particle size changes caused by temperature changes affect the measurement results; the flue gas flow rate in the flue is measured by the flue flow rate measurement system 6, and the measuring chamber flow rate measurement system 7 detects the flow rate of the flue gas in the measuring chamber 2. In combination with the flow rate control system of the measuring chamber 2, the air intake of the jet pump 8 is adjusted by the needle valve 9 to adjust the external discharge flow rate of the measuring chamber 2, thereby adjusting the flue gas flow rate in the measuring chamber 2, ensuring that the flue gas flow rate in the measuring chamber 2 is consistent with the flue gas flow rate in the flue, so as to eliminate the influence of the flue gas flow rate on the measurement results. The valve control system can realize the self-cleaning function of the device, avoid dust particles blocking the pipeline after the device is used for a long time, and can effectively reduce the labor intensity of manual cleaning by personnel. Therefore, the present application measures the flue gas dust concentration through the optical path measurement module 3, and combines the flue gas heating system, the flue flow rate measurement system 6, the measuring chamber flow rate measurement system 7 and the measuring chamber 2 flow rate control system, which can effectively improve the accuracy of the measurement results, improve the measurement accuracy of the flue gas dust concentration, and has a self-cleaning function, which can effectively reduce the labor intensity of personnel.

[0063] It is worth noting that the air inlet pipe 101 includes a sampling section 101a, a detachable section 101b and a fixed section 101c. The sampling section 101a is a gooseneck tube. The inlet direction of the sampling section 101a is arranged opposite to the flow direction of the flue gas. The fixed section 101c is fixedly arranged on the device housing. The detachable section 101b is detachably connected between the fixed section 101c and the sampling section 101a. The detachable section 101b of different lengths can be replaced to adapt to different working conditions, thereby effectively improving the device compatibility.

[0064] The fixed section 101c is provided with a drainage pipe 101e for storing the water in the flue gas through evaporative cooling and for regularly discharging the condensed water;

[0065] The device housing is provided with a flange connector 18, which is connected to the flue through a flange pre-buried in the flue, thereby achieving connection between the device and the flue;

[0066] A mounting seat 19 is provided on the shell, and the dehumidification and heating module 4 is arranged on the mounting seat 19 . An air intake branch pipe 101 d is connected between the measuring chamber 2 and the mounting seat 19 , and the air intake branch pipe 101 d is communicated with the air intake pipe 101 .

[0067] In an exemplary embodiment of the present application, the measurement chamber 2 includes a smoke chamber 201 , a first air curtain chamber 202 , and a second air curtain chamber 203 ;

[0068] The air inlet pipe 101 and the exhaust pipe 102 are both connected to the smoke cavity 201. Both ends of the smoke cavity 201 along the axial direction are provided with through holes 201a for passing the light beam. The first air curtain cavity 202 is provided with window pieces 204 corresponding to the through holes 201a.

[0069] The first air curtain cavity 202 and the second air curtain cavity 203 are respectively arranged at two ends of the smoke cavity 201 along the axial direction. The smoke cavity 201 is provided with a channel 201b connecting the first air curtain cavity 202 and the second air curtain cavity 203 along the axial direction. The first air curtain cavity 202 is connected to the air source.

[0070] In this embodiment, the first air curtain cavity 202 and the second air curtain cavity 203 are arranged at both ends of the smoke cavity 201, and a high-pressure air curtain is formed at both ends of the smoke cavity 201, which can effectively prevent the smoke in the smoke cavity 201 from leaking through the through hole 201a; the light source 301 enters the measuring chamber 2 through the window piece 204 arranged on the first air curtain cavity 202, and the window piece 204 is made of transparent material; the air source enters through the first air curtain cavity 202 and enters the second air curtain cavity 203 through the channel 201b.

[0071] In an exemplary embodiment of the present application, the optical path measurement module 3 includes a light source 301, a beam splitter prism 302, an optical path switching mechanism 303, a light trap 304, an adjustable reflector assembly 305, a converging lens 306 and an optical fiber 307;

[0072] The light source 301, the beam splitter prism 302, the optical path switching mechanism 303, and the light trap 304 are sequentially arranged linearly. The light source 301, the beam splitter prism 302, and the optical path switching mechanism 303 are located outside the measurement chamber 2, and the light trap 304 is located in the second air curtain cavity 203;

[0073] The adjustable reflector assembly 305 is arranged parallel to the beam splitter prism 302 and outside the measuring chamber 2 . The converging lens 306 and the optical fiber 307 are located in the second air curtain chamber 203 . The converging lens 306 and the adjustable reflector assembly 305 are arranged linearly.

[0074] In this embodiment, the light source 301 adopts a laser light source 301. The commonly used light source 301 includes a laser diode, which can provide a stable light beam with controllable intensity. The beam splitter prism 302 is arranged at the light outlet of the light source 301. The beam emitted by the light source 301 is split into two equal and perpendicular measuring beams and calibration beams in terms of intensity by the beam splitter prism 302. The calibration beam is perpendicular to the beam emitted by the light source 301. The calibration beam is reflected by an adjustable reflector assembly 305 arranged parallel to the beam splitter prism 302, so that the calibration beam is parallel to the measuring beam, forming a calibration light path and a measuring light path.

[0075] The optical path switching mechanism 303 includes a switching motor 303a, a gear set 303b and a baffle 303c. The switching motor 303a is used to drive the gear set 303b to drive the baffle 303c to rotate to block the measuring optical path or the calibration optical path. When the device is in the measuring state, the switching motor 303a drives the baffle 303c to block the calibration optical path; when the device is in the calibration state, the switching motor 303a drives the baffle 303c to block the measuring optical path.

[0076] The measuring light path enters the first air curtain cavity 202 through the window sheet 204, and enters the smoke cavity 201 through the through hole 201a provided on the smoke cavity 201. The measuring light beam passes through the smoke cavity 201, and the dust particles scatter the measuring light beam. The laser light scattered by the measuring light beam after passing through the dust particles is converged by the converging lens 306. The laser light converged by the converging lens 306 is collected by the optical fiber 307 and transmitted to the receiver. The optical signal is converted into an electrical signal by the receiver. The dust concentration in the smoke cavity 201 is judged by the intensity of the light scattered by the dust particles. The measuring light beam that is not scattered after passing through the dust particles is absorbed by the light trap 304.

[0077] After the device has been measuring for a period of time, the baffle 303c is driven by the switching motor 303a to block the measuring optical path. At this time, the calibration optical path works, and the calibration light beam is reflected by the adjustable reflector assembly 305 to become a calibration light path parallel to the measuring light beam. The calibration light path does not pass through the measuring area, and the calibration light beam directly passes through the converging lens 306 and is directly received by the receiver to provide a stable reference signal.

[0078] When the intensity of light source 301 changes, both the measuring optical path and the calibration optical path will be affected, but since the calibration optical path does not pass through the measuring area, it only reflects the direct change in the intensity of light source 301; the receiver can compare the signal of the calibration optical path (i.e., the direct reflection of the intensity of light source 301) and the signal of the measuring optical path (the signal affected by multiple factors such as the intensity of light source 301 and dust scattering). Through this comparison, the system can identify the change in the intensity of light source 301 and remove the influence of this change from the signal of the measuring optical path, thereby obtaining a more accurate dust concentration measurement result; the adjustable reflector assembly 305 can fine-tune the angle of the reflector to ensure that the calibration optical path is parallel to the measuring optical path.

[0079] In an exemplary embodiment of the present application, the dehumidification and heating module 4 includes a heating plate 401 and a heating rod 402 , and the constant temperature heating module 5 is disposed on the outer wall of the smoke cavity 201 .

[0080] In this embodiment, the smoke chamber 201 is heated by the constant temperature heating module 5 to ensure that the smoke temperature in the smoke chamber 201 is consistent with the smoke temperature in the flue, thereby eliminating the influence of the smoke temperature on the measurement results; the smoke chamber 201 is also provided with an observation window 201c, and the staff can manually clean the smoke chamber 201 by opening the observation window 201c.

[0081] In an exemplary embodiment of the present application, the flue flow rate measurement system 6 includes a total pressure taking tube 601, a static pressure taking tube 602, a flue differential pressure sensor 603 and a temperature probe 604. The pressure taking port of the total pressure taking tube 601 is arranged relative to the flow direction of the flue gas, and the pressure taking port of the static pressure taking tube 602 is arranged in the same direction as the flow direction of the flue gas. The total pressure taking tube 601 is used to measure the total flue pressure, the static pressure taking tube 602 is used to measure the static pressure of the flue, the flue differential pressure sensor 603 is used to measure the difference between the total flue pressure and the static pressure of the flue, and the temperature probe 604 is used to detect the flue gas temperature in the flue.

[0082] In this embodiment, the pressure difference between the total flue gas pressure and the flue gas static pressure is measured by the flue differential pressure detection sensor. The pressure difference is linearly related to the flue gas flow rate in the flue. The temperature probe 604 collects the temperature of the flue gas in real time. The real-time flow rate of the flue gas in the flue can be calculated by combining the flue gas temperature and pressure.

[0083] In an exemplary embodiment of the present application, the measuring chamber flow rate measurement system 7 includes a total pressure measuring joint 701, a static pressure measuring joint 702 and a smoke chamber differential pressure sensor. The total pressure measuring joint 701 is used to detect the total pressure of the smoke chamber 201, the static pressure measuring joint 702 is used to detect the static pressure of the smoke chamber 201, and the smoke chamber differential pressure sensor is used to measure the difference between the total pressure of the smoke chamber 201 and the static pressure of the smoke chamber 201.

[0084] In this embodiment, the total pressure of the smoke in the smoke chamber 201 and the static pressure of the smoke are measured by a smoke chamber differential pressure sensor, and the pressure difference forms a linear relationship with the smoke flow rate in the smoke chamber 201, thereby calculating the real-time flow rate of the smoke in the smoke chamber 201; according to the smoke flow rate in the flue and the smoke flow rate in the smoke chamber 201, the smoke flow rate in the measuring chamber 2 is adjusted by the flow rate control system of the measuring chamber 2, so that the smoke flow rate in the smoke chamber 201 is consistent with the smoke flow rate in the flue, so as to eliminate the influence of the flow rate on the measurement result, thereby improving the measurement accuracy of the device.

[0085] In an exemplary embodiment of the present application, the jet pump 8 includes a first air inlet 801, a second air inlet 802 and an exhaust port 803, the first air inlet 801 is connected to the exhaust pipe 102, the second air inlet 802 is connected to the needle valve 9, and the exhaust port 803 is connected to the first air inlet 801 and the second air inlet 802.

[0086] In this embodiment, the first air inlet 801 is connected to the exhaust pipe 102, which is used to discharge the smoke in the measuring chamber 2. The second air inlet 802 is connected to the needle valve 9, and the gas input from the air source is received through the needle valve 9 to provide power for the smoke discharge device of the measuring chamber 2. The output power of the jet pump 8 is controlled by the needle valve 9, thereby adjusting the exhaust flow rate of the smoke in the measuring chamber 2, and then adjusting the flow rate of the smoke in the measuring chamber 2.

[0087] In an exemplary embodiment of the present application, the needle valve 9 includes a base 901, a needle valve seat 902, a valve stem 903, a valve sleeve 904 and a valve stem drive motor 905;

[0088] The base 901 is provided with an air inlet joint 901a and an air outlet joint 901b along the axial displacement of the valve stem 903. The air inlet joint 901a is connected to the air source, and the air outlet joint 901b is connected to the second air inlet 802 of the jet pump 8. The base 901 is provided with a mounting cavity, and the needle valve seat 902 is installed in the mounting cavity and blocks the mounting cavity and the base 901 to form an air cavity 901c. The base 901 is provided with a connecting port 901d, and the air inlet joint 901a, the air cavity 901c and the air outlet joint 901b are connected through the connecting port 901d, and the connecting port 901d is in an inverted cone shape;

[0089] The valve stem 903 is threadedly connected to the needle valve seat 902, and the valve stem 903 is connected to the valve stem drive motor 905 through the valve sleeve 904. The valve stem drive motor 905 is used to drive the valve stem 903 to move along its axial direction. The valve stem 903 is provided with a tapered portion, and the tapered portion is used to cooperate with the connecting port 901d to adjust the opening of the connecting port 901d to adjust the air intake of the jet pump 8.

[0090] In this embodiment, the air outlet connector 901b of the needle valve 9 is connected to the second air inlet 802 of the jet pump 8, and the air inlet connector 901a, the air cavity 901c and the air outlet connector 901b are connected through the inverted cone-shaped connecting port 901d provided on the base 901, and the connecting port 901d is blocked or opened by the conical portion provided at the front end of the valve stem 903; the valve stem 903 is threadedly connected to the needle valve seat 902, the valve stem drive motor 905 is threadedly connected to the valve sleeve 904, and the valve sleeve 904 is fixedly connected to the valve stem 903, and the valve stem drive motor 905 drives the valve stem 903 and the valve sleeve 904 to rotate to drive the valve stem 903 rotates, so that the valve stem 903 moves up and down along its axial direction to adjust the opening of the connecting port 901d, thereby adjusting the air intake of the jet pump 8, and further adjusting the flue gas flow rate of the measuring chamber 2; a limit plate 904a is provided on the valve sleeve 904, and the device also includes an upper limit sensor 20 and a lower limit sensor 21, both of which are proximity switches, and the limit plate 904a is located between the upper limit sensor 20 and the lower limit sensor 21, and the valve stem drive motor 905 drives the valve stem 903 along its own axial movement stroke through the upper limit sensor 20 and the lower limit sensor 21.

[0091] In an exemplary embodiment of the present application, the valve control system includes a buffer chamber 10, a solenoid valve seat 11, a flue full-pressure solenoid valve 12, a flue static-pressure solenoid valve 13, a flue gas chamber full-pressure solenoid valve 14, and a flue gas chamber static-pressure solenoid valve 15;

[0092] The solenoid valve seat 11 is provided with a gas source passage 1101, a flue full pressure output port 1102, a flue static pressure output port 1103, a flue gas chamber full pressure output port 1104, and a flue gas chamber static pressure output port 1105;

[0093] The gas source passage 1101 is connected to the gas source, the buffer chamber 10 is connected to the gas source passage 1101, and a pressure relief port 1001 is provided on the buffer chamber 10;

[0094] The flue total pressure output port 1102 and the flue static pressure output port 1103 are connected to the flue differential pressure sensor 603;

[0095] The smoke chamber total pressure output port 1104 and the smoke chamber static pressure output port 1105 are connected to the smoke chamber differential pressure sensor;

[0096] The flue full-pressure solenoid valve 12 is connected to the full-pressure pressure-taking pipe 601, and the full-pressure pressure-taking pipe 601 is connected to the flue differential pressure sensor 603 or the gas source passage 1101 through the flue full-pressure solenoid valve 12;

[0097] The flue static pressure solenoid valve 13 is connected to the flue static pressure taking pipe 602, and the flue static pressure taking pipe 602 is connected to the flue gas cavity differential pressure sensor or the gas source passage 1101 through the flue static pressure solenoid valve 13;

[0098] The smoke cavity full-pressure solenoid valve 14 is connected to the full-pressure pressure measuring joint 701, and the full-pressure pressure measuring joint 701 is connected to the smoke cavity differential pressure sensor or the gas source passage 1101 through the smoke cavity full-pressure solenoid valve 14;

[0099] The smoke chamber static pressure solenoid valve 15 is connected to the static pressure measuring joint 702, and the static pressure measuring joint 702 is connected to the smoke chamber differential pressure sensor or the gas source passage 1101 through the smoke chamber static pressure solenoid valve 15;

[0100] When the device is in the measuring state, the total pressure taking pipe 601 is connected to the flue differential pressure sensor 603 through the flue total pressure solenoid valve 12, the flue static pressure taking pipe 602 is connected to the flue differential pressure sensor 603 through the flue static pressure solenoid valve 13, the total pressure measuring joint 701 is connected to the flue cavity differential pressure sensor through the flue cavity total pressure solenoid valve 14, and the static pressure measuring joint 702 is connected to the flue cavity differential pressure sensor through the flue cavity static pressure solenoid valve 15;

[0101] When the device is in the cleaning state, the total pressure taking pipe 601 is connected to the gas source passage 1101 through the flue total pressure solenoid valve 12, the flue static pressure taking pipe 602 is connected to the gas source passage 1101 through the flue static pressure solenoid valve 13, the total pressure measuring connector 701 is connected to the gas source passage 1101 through the flue gas chamber total pressure solenoid valve 14, and the static pressure measuring connector 702 is connected to the gas source passage 1101 through the flue gas chamber static pressure solenoid valve 15.

[0102] In this embodiment, the buffer chamber 10 is used to buffer the intake pressure of the gas source entering the solenoid valve seat 11, and the pressure relief port 1001 is used to relieve the pressure of the buffer chamber 10. When the device is in the measuring state, the flue full-pressure solenoid valve 12, the flue static pressure solenoid valve 13, the smoke chamber full-pressure solenoid valve 14 and the smoke chamber static pressure solenoid valve 15 are powered off. At this time, the full-pressure pressure-taking pipe 601 and the static pressure-taking pipe 602 are connected to the flue differential pressure sensor 603, and the flue gas flow rate in the flue is detected by the flue differential pressure sensor 603; the full-pressure pressure measuring joint 701 and the static pressure measuring joint 702 are connected to the smoke chamber differential pressure sensor, and the smoke flow rate in the smoke chamber 201 is detected by the smoke chamber differential pressure sensor. If the smoke flow rate of the smoke chamber 201 is different from the smoke flow rate of the flue, the smoke flow rate of the smoke chamber 201 is adjusted by adjusting the intake flow rate of the jet pump 8 through the needle valve 9, so that the smoke flow rate of the smoke chamber 201 is consistent with the smoke flow rate of the flue;

[0103] When the device is switched to the cleaning state, the flue full-pressure solenoid valve 12, the flue static pressure solenoid valve 13, the flue gas chamber full-pressure solenoid valve 14 and the flue gas chamber static pressure solenoid valve 15 are energized, and the full-pressure pressure taking pipe 601, the static pressure taking pipe 602, the full-pressure pressure measuring joint 701 and the static pressure measuring joint 702 are all connected to the air source passage 1101, and compressed air is blown back to the full-pressure pressure taking pipe 601, the static pressure taking pipe 602, the full-pressure pressure measuring joint 701 and the static pressure measuring joint 702 through the air source passage 1101, thereby cleaning the full-pressure pressure taking pipe 601, the static pressure taking pipe 602, the full-pressure pressure measuring joint 701 and the static pressure measuring joint 702 to avoid smoke and dust blockage affecting the measurement results, which can effectively improve the measurement accuracy. The self-cleaning function can effectively reduce the labor intensity of personnel.

[0104] In another exemplary embodiment, a window piece cleaning solenoid valve 22 is further included, and a collecting piece 205 is provided at the position of the window piece 204. The collecting piece 205 is provided with multiple collecting channels 205a in the radial direction. The collecting channels 205a are connected to the gas source passage 1101 through the cleaning solenoid valve, and the gas is gathered to the window piece 204 to purge the window piece 204, so as to avoid smoke and dust accumulation at the position of the window piece 204, affecting the light transmission effect, thereby avoiding affecting the measurement result.

[0105] In an exemplary embodiment of the present application, a heat dissipation system for the light source 301 is also included. The heat dissipation system for the light source 301 is used to cool the light source 301. The heat dissipation system for the light source 301 includes a heat dissipation fan 16 and a heat dissipation channel 17 arranged around the light source 301. The heat dissipation channel 17 is connected to an air source.

[0106] In this embodiment, the light source 301 is air-cooled by a fan and a heat dissipation channel 17, so that the light source 301 can be kept working at a stable temperature, the measurement accuracy and stability are improved, the accuracy and consistency of the measurement results are ensured, and the service life of the light source 301 can be effectively extended.

[0107] Working principle: The flue gas in the flue is introduced into and discharged from the measuring chamber 2 through the flue gas pipeline system 1, and the flue gas dust concentration in the measuring chamber 2 is detected through the optical path measurement module 3. Compared with the traditional flue gas dust concentration measurement method, the measurement precision and accuracy are effectively improved. The dust in the flue gas entering the measuring chamber 2 is heated and dehumidified by the dehumidification heating module 4, eliminating the influence of dust humidity on the measurement result; the flue gas dust in the measuring chamber 2 is heated by the constant temperature heating module 5 to ensure that the flue gas dust temperature in the measuring chamber 2 is consistent with that in the flue gas. The flue gas and dust temperature is consistent, avoiding the problem that the dust particle size changes caused by temperature changes affect the measurement results; the flue gas flow rate in the flue is measured by the flue flow rate measurement system 6, and the measuring chamber flow rate measurement system 7 detects the flow rate of the flue gas in the measuring chamber 2. In combination with the flow rate control system of the measuring chamber 2, the air intake of the jet pump 8 is adjusted by the needle valve 9 to adjust the external discharge flow rate of the measuring chamber 2, thereby adjusting the flue gas flow rate in the measuring chamber 2, ensuring that the flue gas flow rate in the measuring chamber 2 is consistent with the flue gas flow rate in the flue, so as to eliminate the influence of the flue gas flow rate on the measurement results. The valve control system can realize the self-cleaning function of the device, avoid dust particles blocking the pipeline after the device is used for a long time, and can effectively reduce the labor intensity of manual cleaning by personnel. Therefore, the present application measures the flue gas dust concentration through the optical path measurement module 3, and combines the flue gas heating system, the flue flow rate measurement system 6, the measuring chamber flow rate measurement system 7 and the measuring chamber 2 flow rate control system, which can effectively improve the accuracy of the measurement results, improve the measurement accuracy of the flue gas dust concentration, and has a self-cleaning function, which can effectively reduce the labor intensity of personnel.

[0108] The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Anyone familiar with the art may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by a person of ordinary skill in the art without departing from the spirit and technical concept disclosed by the present invention shall still be covered by the claims of the present invention.

Claims

1. A dust concentration measuring device, characterized in that: include: A flue gas pipeline system, comprising an air inlet pipe and an exhaust pipe, wherein the air inlet pipe is used to introduce the flue gas in the flue into the device, and the exhaust pipe is used to discharge the flue gas in the device; A flue gas concentration measurement system, comprising a measurement chamber and an optical path measurement module, wherein the measurement chamber is connected to the air inlet pipe and the exhaust pipe, and the optical path measurement module is used to measure the flue gas dust concentration in the measurement chamber; A flue gas heating system, comprising a dehumidification heating module and a constant temperature heating module, wherein the dehumidification heating module is used to heat the flue gas in the air inlet pipe, and the constant temperature heating module is used to heat the flue gas in the measuring chamber; Flue flow velocity measurement system, used to detect the flue gas velocity in the flue; A measuring chamber flow rate measuring system, used to detect the flue gas flow rate in the measuring chamber; A flow rate control system for the measuring chamber, comprising a jet pump and a needle valve, wherein the jet pump is in communication with the exhaust pipe and the needle valve, the needle valve is connected to an air source, the needle valve is used to adjust the air intake flow rate of the jet pump to adjust the exhaust flow rate of the smoke in the measuring chamber, and the jet pump is used to provide power for exhausting the smoke in the measuring chamber; The valve control system is connected to the flue flow velocity measurement system, the measuring chamber flow velocity measurement system and the gas source. When the device is in a measuring state, the valve control system is connected to the flue flow velocity measurement system and the measuring chamber flow velocity measurement system and is disconnected from the gas source. When the device is in a purge state, the valve control system is connected to the flue flow velocity measurement system, the measuring chamber flow velocity measurement system and the gas source.

2. The dust concentration measuring device according to claim 1, characterized in that: The measuring chamber comprises a smoke cavity, a first air curtain cavity and a second air curtain cavity; The air inlet pipe and the exhaust pipe are both connected to the smoke cavity, and both ends of the smoke cavity along the axial direction are provided with through holes for passing the light beam, and the first air curtain cavity is provided with window sheets corresponding to the through holes; The first air curtain cavity and the second air curtain cavity are respectively arranged at two ends of the smoke cavity along the axial direction. The smoke cavity is provided with a passage connecting the first air curtain cavity and the second air curtain cavity along the axial direction. The first air curtain cavity is connected to an air source.

3. The dust concentration measuring device according to claim 2, characterized in that: The optical path measurement module includes a light source, a beam splitter prism, an optical path switching mechanism, a light trap, an adjustable reflector assembly, a converging lens and an optical fiber; The light source, the beam splitter prism, the optical path switching mechanism, and the light trap are sequentially arranged linearly, the light source, the beam splitter prism, and the optical path switching mechanism are located outside the measuring room, and the light trap is located inside the second air curtain cavity; The adjustable reflector assembly is arranged in parallel above the beam splitter prism and outside the measuring chamber. The converging lens and the optical fiber are located in the second air curtain cavity, and the converging lens and the adjustable reflector assembly are arranged linearly.

4. The dust concentration measuring device according to claim 2, characterized in that: The dehumidification and heating module comprises a heating plate and a heating rod, and the constant temperature heating module is arranged on the outer wall of the smoke cavity.

5. The dust concentration measuring device according to claim 2, characterized in that: The flue flow rate measurement system includes a total pressure taking tube, a static pressure taking tube, a flue differential pressure sensor and a temperature probe. The pressure taking port of the total pressure taking tube is arranged relative to the flow direction of the flue gas, and the pressure taking port of the static pressure taking tube is arranged in the same direction as the flow direction of the flue gas. The total pressure taking tube is used to measure the total flue pressure, the static pressure taking tube is used to measure the static pressure of the flue, the flue differential pressure sensor is used to measure the difference between the total flue pressure and the static pressure of the flue, and the temperature probe is used to detect the flue gas temperature in the flue.

6. The dust concentration measuring device according to claim 5, characterized in that: The measuring chamber flow rate measurement system includes a total pressure measuring joint, a static pressure measuring joint and a smoke chamber differential pressure sensor. The total pressure measuring joint is used to detect the total pressure of the smoke chamber, the static pressure measuring joint is used to detect the static pressure of the smoke chamber, and the smoke chamber differential pressure sensor is used to measure the difference between the total pressure of the smoke chamber and the static pressure of the smoke chamber.

7. The dust concentration measuring device according to claim 1, characterized in that: The jet pump comprises a first air inlet, a second air inlet and an exhaust port, the first air inlet is communicated with the exhaust pipe, the second air inlet is communicated with the needle valve, and the exhaust port is communicated with the first air inlet and the second air inlet.

8. The dust concentration measuring device according to claim 7, characterized in that: The needle valve comprises a base, a needle valve seat, a valve stem, a valve sleeve and a valve stem driving motor; The base is provided with an air inlet joint and an air outlet joint staggered along the axial direction of the valve stem, the air inlet joint is connected to the air source, and the air outlet joint is connected to the second air inlet of the jet pump, the base is provided with a mounting cavity, the needle valve seat is installed in the mounting cavity, and blocks the mounting cavity and the base to form an air cavity, the base is provided with a connecting port, the air inlet joint, the air cavity and the air outlet joint are connected through the connecting port, and the connecting port is in an inverted cone shape; The valve stem is threadedly connected to the needle valve seat, and the valve stem is connected to the valve stem drive motor through a valve sleeve. The valve stem drive motor is used to drive the valve stem to move along its axial direction. The valve stem is provided with a tapered portion, and the tapered portion is used to cooperate with the connecting port to adjust the opening of the connecting port so as to adjust the air intake of the jet pump.

9. The dust concentration measuring device according to claim 6, characterized in that: The valve control system includes a buffer chamber, a solenoid valve seat, a flue full-pressure solenoid valve, a flue static-pressure solenoid valve, a flue gas chamber full-pressure solenoid valve and a flue gas chamber static-pressure solenoid valve; The solenoid valve seat is provided with a gas source passage, a flue full-pressure output port, a flue static-pressure output port, a flue gas cavity full-pressure output port, and a flue gas cavity static-pressure output port; The gas source passage is in communication with the gas source, the buffer chamber is in communication with the gas source passage, and a pressure relief port is provided on the buffer chamber; The flue total pressure output port and the flue static pressure output port are connected to the flue differential pressure sensor; The smoke chamber total pressure output port and the smoke chamber static pressure output port are connected to the smoke chamber differential pressure sensor; The flue full-pressure solenoid valve is connected to the full-pressure pressure-taking pipe, and the full-pressure pressure-taking pipe is connected to the flue differential pressure sensor or connected to the gas source passage through the flue full-pressure solenoid valve; The flue static pressure solenoid valve is in communication with the static pressure taking pipe, and the static pressure taking pipe is connected to the flue differential pressure sensor or is in communication with the gas source passage through the flue static pressure solenoid valve; The smoke chamber full-pressure solenoid valve is connected to the full-pressure pressure measuring joint, and the full-pressure pressure measuring joint is connected to the smoke chamber differential pressure sensor or connected to the gas source passage through the smoke chamber full-pressure solenoid valve; The smoke chamber static pressure solenoid valve is connected to the static pressure measuring joint, and the static pressure measuring joint is connected to the smoke chamber differential pressure sensor or the gas source passage through the smoke chamber static pressure solenoid valve; When the device is in a measuring state, the total pressure taking pipe is connected to the flue differential pressure sensor through the flue total pressure solenoid valve, the static pressure taking pipe is connected to the flue differential pressure sensor through the flue static pressure solenoid valve, the total pressure measuring joint is connected to the flue differential pressure sensor through the flue total pressure solenoid valve, and the static pressure measuring joint is connected to the flue differential pressure sensor through the flue static pressure solenoid valve; When the device is in a cleaning state, the total pressure taking pipe is connected to the gas source passage through the flue total pressure solenoid valve, the static pressure taking pipe is connected to the gas source passage through the flue static pressure solenoid valve, the total pressure measuring joint is connected to the gas source passage through the flue gas chamber total pressure solenoid valve, and the static pressure measuring joint is connected to the gas source passage through the flue gas chamber static pressure solenoid valve.

10. The dust concentration measuring device according to claim 3, characterized in that: It also includes a light source heat dissipation system, which is used to cool the light source. The light source heat dissipation system includes a heat dissipation fan and a heat dissipation channel arranged around the light source, and the heat dissipation channel is connected to an air source.

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