CN210221767U - Particulate matter monitor - Google Patents

Abstract

The utility model discloses a particulate matter monitor. Particulate matter monitor includes: the light source module generates light; the light splitting module is used for splitting the light rays emitted by the light source module into calibration light rays and measurement light rays; a light blocking mechanism for blocking the calibration light or the measurement light; the light rays emitted by the light splitting module sequentially pass through the window sheet, the first diaphragm and the second diaphragm of the scattering structure; the light receiving module is used for receiving the light rays emitted by the scattering structure; and the detector determines the light energy received by the light receiving module. The utility model discloses a particulate matter monitor has pollution self-diagnosis function.

Description

Particulate matter monitor

Technical Field

The utility model belongs to the environmental monitoring field especially relates to a particulate matter monitor.

Background

With the strictness of environmental laws and regulations and the advance of dust removal technologyStep and development, the emission concentration of particulate matters of the organic pollution source is lower and lower. There are many new coal-fired boilers on-line, with average particle emission concentrations even below 3mg/m³And has the characteristics of high temperature and high humidity. This puts higher demands on the detection limit, sensitivity, repeatability, stray light suppression, etc. of the instrument.

Because the smoke discharged by the equipment has the characteristics of high temperature and high humidity, water mist is easily formed on the lens, and dust is adsorbed. When dust and water mist are attached to the lens, the transmittance of the lens is reduced, and the normal work of the instrument is influenced. The current instrument only measures smoke particles, and has no function of periodically testing the pollution degree of an optical system, particularly evaluating the pollution degree of an optical element in a particle measuring chamber.

SUMMERY OF THE UTILITY MODEL

In order to solve the problem, the utility model provides a particulate matter monitor is equipped with light path pollution degree self-diagnosis function, realizes the measurement to light path pollution value.

The utility model provides a particulate matter monitor, include: a light source module generating light; the light splitting module is used for splitting the light rays emitted by the light source module into calibration light rays and measurement light rays; a light blocking mechanism for blocking the calibration light or the measurement light; the light rays emitted by the light splitting module sequentially pass through a window sheet, a first diaphragm and a second diaphragm of the scattering structure; the light receiving module is used for receiving the light rays emitted by the scattering structure; and the detector is used for determining the light energy received by the light receiving module.

As the utility model discloses optional scheme, the particulate matter monitor still includes the shell, the shell is the cavity structure, light source module, beam splitting module, the mechanism that is in the light is located in the cavity of shell, scattering structure fixes on the shell, receive the light module and connect scattering structure.

As the utility model discloses optional scheme, the scattering structure includes the probe rod, the probe rod is the tubulose, by the one end of probe rod sets gradually the window piece mount pad of installing the window piece, installs the first diaphragm mount pad of first diaphragm, installs the second diaphragm mount pad and receive the optical module mount pad of second diaphragm to the other end, be equipped with the light passing hole on receiving the optical module mount pad, receive the optical module and connect receive the optical module mount pad, the light passing hole of receiving the optical module mount pad with the light entering hole of receiving the optical module is relative.

As an optional scheme of the present invention, the particulate matter monitor further includes an optical trap cover, the optical trap cover includes a cover body and an optical trap module, and the optical trap module is located on an inner side wall of the cover body; the cover body and the light receiving module mounting seat form a closed cavity, and the light receiving module is positioned in the cavity; the light trap module absorbs unscattered light rays in the measuring light rays.

As an alternative solution of the present invention, the optical trap module includes a convex spherical member with an inclined end and a trap cylinder with an internal thread, the convex spherical member is located in the trap cylinder.

As the optional scheme of the utility model, convex spherical surface spare and trap section of thick bamboo all carry out blackening and handle.

As an optional scheme of the utility model, the particulate matter monitor further comprises a flange, wherein the flange is cylindrical and is fixed at the bottom of the shell; the scattering structure penetrates through the flange, and the outer wall of the second diaphragm mounting seat is matched with the inner wall of the flange; and an air inlet is formed in the side wall of the flange.

As the utility model discloses optional scheme, be equipped with the air inlet on scattering structure's the probe rod, the air inlet of probe rod with the air inlet intercommunication of flange.

As the optional scheme of the utility model, be equipped with the viewing aperture on the lateral wall of flange.

As an alternative aspect of the present invention, the detector is located in the cavity of the housing.

The utility model discloses a light that particulate matter monitor jetted out with light source module divide into calibration light and measurement light, and through the pollution degree of calibration light detection light path, measurement light shines the particulate matter and takes place the scattering, receives the scattered light that light module received measurement light, can be used to particulate matter concentration's calculation.

Drawings

Fig. 1 is a schematic diagram of the particulate monitor of the present invention.

Fig. 2 is the utility model discloses particulate matter monitor's structural schematic.

Fig. 3 is a schematic view of the light source module of the present invention.

Fig. 4 is a schematic diagram of the spectroscopy module of the present invention.

Fig. 5 is a schematic view of the light blocking mechanism of the present invention.

Fig. 6 is a schematic diagram of the scattering structure of the present invention.

Fig. 7 is a schematic view of the light receiving module of the present invention.

Fig. 8 is a schematic diagram of the optical trap cover of the present invention.

Fig. 9 is a schematic view of the flange of the present invention.

Fig. 10 is a schematic view of the purge gas circuit of the present invention.

Fig. 11 is a schematic view of the sample gas port of the present invention.

Detailed Description

The invention will be described in more detail with reference to the following figures and examples, so that the aspects and advantages of the invention can be better understood. However, the specific embodiments and examples described below are for illustrative purposes only and are not intended to limit the present invention.

In the present invention, the term "connected" is to be understood broadly, and may be directly connected or connected through an intermediate medium, unless otherwise specifically defined or limited. In the description of the present invention, it is to be understood that the directions or positional relationships indicated by the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", etc. are based on the directions or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and thus, should not be construed as limiting the present invention.

As shown in fig. 1 and 2, the utility model discloses particulate matter monitor divides into calibration light and measurement light with the light that the light source produced. When the self-checking or the calibration is carried out, the measuring light is shielded, only the calibration light is emitted, and the transmissivity of a light path or the linearity of an instrument can be measured according to the energy of the calibration light received by the detector. When the sample gas is measured, the calibration light is shielded, only the measurement light is emitted, the measurement light irradiates the particles in the sample gas to be scattered, and the detector determines the energy of the scattered light. The energy ratio of the scattered light to the calibration light is positively correlated with the concentration of the particulate matter.

Particulate matter monitor includes: the light source module 100, the light splitting module 200, the light blocking mechanism 300, the scattering structure 400, the light receiving module 500 and the detector 600.

As shown in fig. 3, the light source module 100 is used for generating parallel light rays. The light source module 100 includes a laser plate 101, and the laser plate 101 is a circuit board of the light source module. The laser diode 102 is mounted on the laser plate 101 through the base 103, and the laser diode 102 emits light when it is energized. The collimating mirror 104 is disposed below the laser diode 102 through the mounting tube 105, and the light emitted from the laser diode 102 passes through the collimating mirror 104 to form a parallel light beam and then is emitted.

As shown in fig. 4, the splitting module 200 includes a splitting prism mounting plate 201, and the splitting prism mounting plate 201 may be made of stainless steel, so as to be conveniently mounted and fixed. The beam splitter prism 202 is mounted on the beam splitter prism mounting board 201. The light emitted from the light source module 100 is irradiated on the beam splitter prism 202 and divided into two parallel beams, one beam is used as a calibration beam, and the other beam is used as a measurement beam.

The beam splitter mounting plate 201 is provided with a plurality of studs 203, and the studs 203 are sleeved with elastic members (not shown, such as springs). Nut 204 is mounted on stud 203. Optionally, the laser plate 101 is sleeved on the stud 203, the elastic member supports the laser plate 101, and the nut 204 presses on the laser plate 101. The adjusting nut 204 can adjust the angle of the light emitted from the light source module 100.

As shown in fig. 5, the light blocking mechanism 300 is fixed to the spectroscopic prism mounting plate 201. The light blocking mechanism 300 includes an electromagnet 301, an iron core of the electromagnet 301 is used as a swing arm 302, and a light blocking plate 303 is mounted on the swing arm 302. A permanent magnet (not shown in the figure) is arranged below the electromagnet 301, when the electromagnet 301 is not electrified, the permanent magnet attracts the swing arm 302 to swing to the lower side, after the electromagnet 301 is electrified, the magnetism of the swing arm 302 is the same as that of the permanent magnet, and the repulsion force of the same magnetic pole enables the swing arm 302 to swing to the upper side. The swing of the swing arm 302 drives the light barrier 303 to move, and the light barrier 303 can block the calibration light or the measurement light, so that only one light is emitted from the light splitting module 200.

The light emitted by the light splitting module 200 irradiates the scattering structure 400, the scattering structure 400 is provided with a window sheet, a first diaphragm and a second diaphragm, and the light emitted by the light splitting module 200 passes through the window sheet, the first diaphragm and the second diaphragm once and then exits the scattering structure 400.

As shown in fig. 6, the scattering structure 400 of the present embodiment includes a probe 401, where the probe 401 is a main body of the scattering structure 400 and is a tubular structure, and a through hole is formed inside the tubular structure. The top end of the probe 401 is provided with a fixing plate 402 for fixing the scattering structure 400. The fixing plate 402 is provided with a window piece mounting seat 403, and the window piece 407 is mounted on the window piece mounting seat 403. The window piece mounting seat 403 is arranged parallel to the probe rod 401. The window sheet 407 may protect the light source module 100 and the light splitting module 200. Below the window sheet mounting seat 403 is a first diaphragm mounting seat 404, and a first diaphragm 408 is mounted on the first diaphragm mounting seat 404. A second diaphragm mounting seat 405 is arranged below the first diaphragm mounting seat 404, and a second diaphragm 409 is arranged on the second diaphragm mounting seat 405. The bottom end of the probe 401 is a light receiving module mounting seat 406. The light receiving module mounting base 406 is provided with a light through hole 410, the light through hole 410 is opposite to the second diaphragm 409, and light emitted from the second diaphragm 409 passes through the light through hole 410. The first diaphragm 408 and the second diaphragm 409 play a role of eliminating stray light.

The light receiving module 500 is mounted on the light receiving module mounting 406, and the light emitted from the scattering structure 400 is received by the light receiving module 500.

As shown in fig. 7, the light receiving module 500 of the present embodiment includes a lens base 501, a plano-convex lens 502 is disposed at a light inlet hole at a top end of the lens base 501, and the light inlet hole of the light receiving module 500 is opposite to the light through hole 410 of the light receiving module mounting base, so that light emitted from the scattering structure 400 is incident into the light receiving module 500.

A mirror 504 is fixed to a side wall of the mirror base 501 via a mirror presser plate 503. The calibration light passes through the scattering structure 400 and then enters the light receiving module 500, and the calibration light passes through the plano-convex lens 502 and the reflector 504 and then enters the optical fiber connected to the light receiving module 500.

After the measurement light passes through the scattering structure 400, the scattered light enters the light receiving module 500, and the scattered light enters the optical fiber connected to the light receiving module 500 after passing through the plano-convex lens 502.

The adapter plate 505 is connected to the mirror base 501, and the adapter plate 505 is used for fixing with the light receiving module mounting base 406.

The detector 600 is connected to the light receiving module 500 through an optical fiber, and the detector 600 determines the light energy received by the light receiving module 500.

When the particulate matter monitor of this embodiment calibrates, it is sheltered from by mechanism 300 that is in the light to measure light, only calibrates light and jets out among the spectral module 200. The calibration light passes through the window plate 407, the first diaphragm 408, the second diaphragm 409, the light-passing hole 410, the plano-convex lens 502 and the reflector 504 on the scattering structure to reach the end face of the optical fiber, and the optical energy is guided into the detector 600 by the optical fiber. The detector 600 determines the energy of the received calibration light as E1.

E1 is gradually reduced due to aging of the device and contamination of the lens. The initial value of E1 is taken as E0, namely the energy of the calibration light when the particulate matter monitor is pollution-free and aging-free is E0. The degree of cleanliness of the optical path can be measured by the transmittance:

when the pollution degree of the optical element of the particulate matter monitor exceeds a certain limit value, the transmittance is reduced to a preset value (if the transmittance is lower than 0.7), and the particulate matter monitor can send out an early warning to remind a worker. The particulate matter monitor of this embodiment has the light path pollution self-diagnosis function.

When the particulate matter monitor detects the sample gas, the calibration light is shielded by the light blocking mechanism 300, and only the measurement light is emitted from the light splitting module 200. The measuring light passes through the window plate 407, the first diaphragm 408 and the second diaphragm 409 on the scattering structure and then is scattered with the particles in the sample gas. The scattered light passes through the plano-convex lens 502 and reaches the end face of the optical fiber, where it is directed by the fiber into the detector 600. The detector 600 determines the energy of the received scattered light as E2.

The ratio of the energy of the scattered light ray E2 to the energy of the calibration light ray E1 is positively correlated with the concentration of the particulate matter, and the concentration value of the particulate matter can be obtained by calibration with a standard method.

The resulting concentration of particulate matter in the particulate matter monitor of this embodiment eliminates the effects of optical path contamination because the energy intensity of the calibration light already contains the effects of optical path contamination.

Optionally, as shown in fig. 2, the particulate matter monitor further includes a housing 800, where the housing 800 has a cavity structure and may be made of aluminum. The light source module 100, the light splitting module 200 and the light blocking mechanism 300 are all located in the cavity of the housing 800. The fixation plate 402 of the scattering structure is fixed in the cavity of the housing 800 by the fixation plate 801, and the rest of the scattering structure 400 extends out of the housing 800.

As shown in fig. 2 and 8, the particulate monitor further includes an optical trap housing 700. The light trap housing 700 includes a housing body 701 and a light trap module. The cover 701 and the light receiving module mounting seat 406 form a closed cavity, and the light receiving module 500 is located in the cavity. The light trap module is located on the inner side wall of the cover body 701, and the light trap module absorbs light which is not scattered in the measuring light, so that the light is prevented from being scattered in the cavity of the cover body 701, and the performance of an instrument is prevented from being interfered. The cover 701 protects the light receiving module 500 and the light trap module.

The optical trapping module comprises a convex spherical member 702 and a trapping barrel 703. The trap cylinder 703 is cylindrical and the convex spherical member 702 is located inside the trap cylinder 703. The end face of the convex spherical member 702 is a convex spherical surface which reflects light onto the trap drum 703. The light trap module can annihilate the light, and the influence of unscattered light on the monitoring result is avoided.

Optionally, the convex spherical member 702 and the trap cylinder 703 are made of aluminum and are blackened to facilitate annihilation of light.

As shown in fig. 9, the particulate monitor further includes a flange 900. The flange 900 is fixed to the bottom of the housing 800. The flange 900 comprises a body 901, the body 901 is cylindrical, the scattering structure 400 penetrates through the flange 900, and the outer wall of the second diaphragm mounting seat 405 is matched with the inner wall of the flange 900. The body 901, the second diaphragm mount 405 and the fixing plate 402 of the scattering structure constitute a closed space.

An air inlet 902 is arranged on the side wall of the flange, and the air inlet 902 is connected with a clean air (zero air) source through a joint 903. Clean air is introduced into the cavity of the flange 900 to purge the optical devices in the flange, thereby preventing the optical devices from being polluted.

The air inlet 411 is arranged on the probe rod of the scattering structure, the air inlet 411 of the probe rod is communicated with the air inlet 902 of the flange, clean air can enter the probe rod 401, and enters the cavity of the light trap cover 700 through the probe rod 401 to blow and sweep the light receiving module 500.

As shown in fig. 10, after the air path of the purge gas enters from the air inlet 902, one path of the purge gas purges the window piece 407, the first diaphragm 408, and the second diaphragm 409, and flows out from the light outlet of the second diaphragm 409. The other path enters the cavity of the light trap cover 700 through the air inlet 411 of the probe rod and flows out through the light through hole 410 arranged on the light receiving module mounting base 406.

As shown in FIG. 9, a viewing port 904 is provided in the side wall of the flange. The viewing port 904 is located opposite to the window sheet 407, and it is possible to observe whether dust falls on the window sheet 407 through the viewing port 904 and clean the window sheet 407 in time. A detachable sealing cover 905 is arranged at the observation port 904, and the sealing cover 905 is arranged to facilitate cleaning in the observation port 904. The connecting portion 906 is used for fixed connection with the housing 800.

Optionally, the detector 600 is located in the cavity of the housing 800, and the optical fiber connecting the light receiving module 500 and the detector 600 passes through the probe 401.

As shown in fig. 11, the sample gas port is located at a position a, and the sample gas (measured gas) is introduced from the sample gas port during measurement, and the clean gas is introduced from the sample gas port during calibration.

It should be noted that the above-mentioned embodiments described with reference to the drawings are only intended to illustrate the present invention and not to limit the scope of the present invention, and those skilled in the art should understand that modifications or equivalent substitutions made on the present invention without departing from the spirit and scope of the present invention should be included in the scope of the present invention. Furthermore, unless the context indicates otherwise, words that appear in the singular include the plural and vice versa. Additionally, all or a portion of any embodiment may be utilized with all or a portion of any other embodiment, unless stated otherwise.

Claims (10)

1. A particulate matter monitor, comprising:

a light source module generating light;

the light splitting module is used for splitting the light rays emitted by the light source module into calibration light rays and measurement light rays;

a light blocking mechanism for blocking the calibration light or the measurement light;

the light rays emitted by the light splitting module sequentially pass through a window sheet, a first diaphragm and a second diaphragm of the scattering structure;

the light receiving module is used for receiving the light rays emitted by the scattering structure;

and the detector is used for determining the light energy received by the light receiving module.

2. The particulate matter monitor of claim 1, further comprising a housing, wherein the housing is a cavity structure, the light source module, the light splitting module and the light blocking mechanism are located in the cavity of the housing, the scattering structure is fixed on the housing, and the light receiving module is connected to the scattering structure.

3. The particulate matter monitor of claim 2, wherein the scattering structure comprises a probe rod, the probe rod is tubular, a window piece mounting seat provided with a window piece, a first diaphragm mounting seat provided with a first diaphragm, a second diaphragm mounting seat provided with a second diaphragm and a light receiving module mounting seat are sequentially arranged from one end to the other end of the probe rod, a light through hole is formed in the light receiving module mounting seat, the light receiving module is connected with the light receiving module mounting seat, and the light through hole of the light receiving module mounting seat is opposite to the light inlet hole of the light receiving module.

4. The particulate monitor of claim 3, further comprising an optical trap housing comprising a housing body and an optical trap module, the optical trap module being located on an inner sidewall of the housing body; the cover body and the light receiving module mounting seat form a closed cavity, and the light receiving module is positioned in the cavity; the light trap module absorbs unscattered light rays in the measuring light rays.

5. The particulate monitoring instrument of claim 4, wherein the optical trapping module comprises a convex spherical member with inclined ends and a trapping barrel with internal threads, the convex spherical member being located within the trapping barrel.

6. The particulate matter monitor of claim 5, wherein the convex spherical member and the trap barrel are both blackened.

7. The particulate matter monitor of claim 4, further comprising a flange, wherein the flange is cylindrical and is fixed to the bottom of the housing;

the scattering structure penetrates through the flange, and the outer wall of the second diaphragm mounting seat is matched with the inner wall of the flange;

and an air inlet is formed in the side wall of the flange.

8. The particulate matter monitor of claim 7, wherein the probe of the scattering structure is provided with an air inlet, and the air inlet of the probe is communicated with the air inlet of the flange.

9. The particulate matter monitor of claim 7, wherein a viewing port is provided in a side wall of the flange.

10. The particulate matter monitor of claim 2, wherein the detector is located within a cavity of the housing.

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