Plug-in type back scattering smoke instrument

Abstract

The utility model provides a plug-in type back scattering smoke instrument which can realize accurate measurement of particulate matters under the condition of ultra-low concentration. The device comprises an insertion pipe and a bracket, wherein the bracket is mounted on the outer wall of a flue through a flange; the insertion pipe is arranged on the bracket and extends into the flue; a measuring probe assembly is arranged in the insertion pipe and comprises a measuring shell, a detection opening is formed in the measuring end of the measuring shell, and a first lens, a second lens, a smoke laser and a smoke detector are sequentially arranged in the measuring shell in the smoke penetration direction. Laser emitted by the smoke laser device is emitted to smoke particles from the second lens and the first lens to generate back scattering light, the back scattering light enters the smoke detector through the second lens, a smoke controller is installed on the bracket, the smoke detector is connected to the smoke controller through a transmission cable, and the smoke detector is connected to the smoke controller through the transmission cable. The diameter of the first lens is smaller than that of the second lens.

Description

TECHNICAL FIELD

[0001] The utility model relates to smoke detection technical field, concretely is a kind of plug-in rear scattering smoke dust instrument. BACKGROUND

[0002] Coal-fired power plant is generally installed on the flue between the outlet of electric precipitator and the inlet of desulfurization tower particle concentration measuring device for monitoring the particle concentration level at this place, so as to control the working efficiency of electric precipitator and adjust the process of desulfurization tower, etc., the flue gas temperature at the monitoring place is generally higher than 100 degrees Celsius, and the water in the flue gas exists in the form of gaseous water vapor, so the smoke dust instrument using laser rear scattering principle can be used for in-situ installation and measurement, the in-situ rear scattering smoke dust instrument has the advantages of simple structure, relatively low cost, small maintenance amount, etc., but with the continuous upgrading of dust removal facilities in coal-fired power plants, the particle concentration between the outlet of electric precipitator and the inlet of desulfurization tower in some power plants has been lower than 10 mg / m3, when the laser rear scattering smoke dust instrument measures ultra-low concentration particles, the total light intensity of the backscattering light generated is insufficient, and the measurement accuracy is low, when the smoke dust instrument detector installed outside the flue receives the backscattering light, it can only receive the backscattering light that is just directed to its position, and the rest of the scattering light cannot be received, at the same time, since the distance between the scattering point position and the smoke dust instrument is far, the backscattering light will be blocked by the particles in the flue, causing further loss of effective light signal, therefore, due to the above reasons, the measurement result of the existing rear scattering smoke dust instrument under the condition of ultra-low particle concentration is difficult to reflect the real concentration change of particles, and the measurement accuracy and resolution are low. SUMMARY

[0003] In view of the above problems, the utility model provides a kind of plug-in rear scattering smoke dust instrument, it can realize the accurate measurement of particle under ultra-low concentration condition.

[0004] The utility model discloses the following technical scheme, a kind of plug-in rear scattering smoke dust instrument, it includes insertion pipe, bracket, the bracket is installed on the outer wall of flue by flange;The insertion pipe is installed on the bracket, and extends into the flue;Measurement probe assembly is equipped in the insertion pipe, the measurement probe assembly includes measurement shell, and the measurement end of the measurement shell is opened with detection port, first lens, second lens, smoke dust laser, smoke dust detector are sequentially equipped in the measurement shell along the direction that flue gas penetrates;The laser emitted by the smoke dust laser generates backscattering light after being incident on smoke dust particles from the second lens, first lens, and enters the smoke dust detector through the second lens;The bracket is equipped with smoke dust controller, the smoke dust detector is connected to the smoke dust controller by transmission cable, and the diameter of the first lens is less than the diameter of the second lens.

[0005] Further, a back-blowing fan is mounted on the bracket, and the back-blowing fan is connected to the insertion pipe by a back-blowing air pipe.

[0006] Furthermore, the measuring housing is movably disposed within the insertion tube, and a toothed rod is arranged within the insertion tube along the length direction of the insertion tube. The end of the toothed rod is connected to the outer wall of the measuring housing. A stepper motor is provided within the insertion tube, and the stepper motor is drivenly connected to the toothed rod.

[0007] Furthermore, the insertion tube has openings at both ends;

[0008] Furthermore, a gap is left between the measuring housing and the insertion tube;

[0009] Furthermore, the outer edge of the second lens abuts against the inner wall surface of the measuring housing; both the first lens and the second lens are convex lenses.

[0010] The beneficial effects of this utility model are that the insertion tube with the measuring probe assembly is inserted into the flue to measure particulate matter at close range. This not only shortens the distance between the light source and the smoke and dust particles and reduces the backscattered light propagation loss, but also increases the backscattered light reception range by allowing it to enter the smoke detector through the second lens. This enables accurate measurement of particulate matter under ultra-low concentration conditions and gives it good market competitiveness. Attached Figure Description

[0011] Fig. 1 This is a schematic diagram of the structure of this utility model;

[0012] Fig. 2 This is a partially enlarged structural diagram of the assembly of the measuring probe assembly in this utility model.

[0013] Fig. 3 This is a schematic diagram of the state structure used in this utility model. Detailed Implementation

[0014] like Figs. 1-3 As shown, this utility model discloses an insertion-type backscattering dust meter, which includes an insertion tube 4 and a bracket 11. The bracket 11 is installed on the outer wall of the flue 1 via a flange 2. The insertion tube 4 is mounted on the bracket 11 and extends into the flue 1. A measuring probe assembly is provided inside the insertion tube 4. The measuring probe assembly includes a measuring housing 10. The measuring end of the measuring housing 10 has a detection port 19. Inside the measuring housing 10, along the flue gas penetration direction, a first lens 15, a second lens 14, a dust laser 13, and a dust detector 12 are arranged in sequence. The laser emitted by the dust laser 13 is directed from the second lens 14 and the first lens 15 to the dust particles 17 and generates backscattered light 16, which enters the dust detector 12 through the second lens 14. A dust controller 3 is mounted on the bracket 11. The dust detector 12 is connected to the dust controller 3 via a transmission cable 7. The diameter of the first lens 15 is smaller than the diameter of the second lens 14.

[0015] The reverse blowing fan 5 is arranged on the bracket 11 and is communicated with the insertion pipe 4 through a reverse blowing air pipe 6; a gap is left between the measurement shell 10 and the insertion pipe 4; the reverse blowing fan 5 continuously blows low-temperature air into the insertion pipe 4 through the reverse blowing air pipe 6, so as to ensure that the measurement shell 10 is not damaged by being contacted with high-temperature flue gas.

[0016] The measurement shell 10 is movably arranged in the insertion pipe 4; a rack 8 is arranged in the insertion pipe 4 along the length direction of the insertion pipe 4, and the end of the rack 8 is connected with the outer wall of the measurement shell 10; a stepping motor 9 is arranged in the insertion pipe 4 and is in transmission connection with the rack 8; when the reverse blowing fan 5 fails or other abnormal conditions occur, the stepping motor 9 can drive the rack 8 until the measurement shell 10 is withdrawn out of the flange 2, so as to protect the measurement shell 10 from being damaged. Openings are arranged at the two ends of the insertion pipe 4; the opening at the front end of the insertion pipe 4 is convenient for laser emission and enables the measurement probe assembly to be in close contact with the smoke dust particles 17; and the opening at the tail end of the insertion pipe 4 is used for the rack 8 to pass through.

[0017] The outer edge of the second lens 14 abuts against the inner wall surface of the measurement shell 10; the first lens 15 and the second lens 14 are both convex lenses.

[0018] The existing control device is adopted in the smoke controller 3, so as to be used for subsequent smoke data signal processing.

[0019] The insertion pipe 4 can be inserted into a flue gas temperature environment with a flue gas temperature of 100-200 DEG C to continuously measure the particulate matter concentration; specifically, the working principle is that the measurement probe assembly is sent into the deep part of the flue 1 through the insertion pipe 4 to measure the smoke dust particles 17 at zero distance; during the measurement, the laser emitted by the smoke laser 13 becomes a laser beam 18 after passing through the second lens 14 and the first lens 15, irradiates the smoke dust particles 17, and generates scattered light which is uniformly propagated in different directions; then the scattered light is reflected to the smoke detector 12 through the second lens 14, so that the particulate matter concentration measurement is completed; the measured electric signal is transmitted to the smoke controller 3 through the transmission cable 7 and is further processed, so that the particulate matter is accurately measured under the condition of ultra-low concentration.

[0020] In the utility model, since the measurement component and the smoke dust particles 17 are almost measured at zero distance, not only the distance between the light source and the particulate matter is shortened, and the propagation loss of the backscattering light 16 is reduced, but also the backscattering light 16 can be captured in a 360° circular ring through the first lens 15 and the second lens 14, the receiving range of the backscattering light is increased, and the receiving intensity of the backscattering light 16 is greatly improved, which means that the particulate matter with lower concentration can be accurately measured, and the measurement resolution and the measurement performance are improved, and the excellent measurement performance can effectively improve the market competitiveness of the product.

[0021] It will be obvious to a person skilled in the art that the application is not limited to the details of the above-described exemplary embodiments, but that the application can be implemented in other concrete forms without departing from the spirit or essential characteristics of the application. The embodiments should, therefore, be considered in all respects as illustrative and not restrictive, the scope of the application being indicated by the appended claims rather than by the above description, and all changes which come within the meaning and range of equivalents of the claims are therefore intended to be embraced therein. Any reference signs in the claims should not be construed as limiting the scope of the claims concerned.

[0022] Furthermore, it should be understood that although the present specification describes exemplary embodiments, the application is not limited to only one independent technical solution in each embodiment, and the specification is described in this way only for the sake of clarity, and a person skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by a person skilled in the art.

Claims

1. An insertion probe backscatter soot meter characterized by: It includes an insertion pipe, a bracket, the bracket is installed on the outer wall of the flue through a flange; the insertion pipe is installed on the bracket and extends into the flue; a measuring probe assembly is arranged in the insertion pipe, the measuring probe assembly includes a measuring shell, a detection port is opened at the measuring end of the measuring shell, a first lens, a second lens, a soot laser and a soot detector are sequentially arranged in the measuring shell along the direction of the flue gas entering, the backscattering light is generated after the laser emitted by the soot laser is incident on the soot particles through the second lens and the first lens, and then enters the soot detector through the second lens, a soot controller is installed on the bracket, the soot detector is connected to the soot controller through a transmission cable, and the diameter of the first lens is smaller than the diameter of the second lens.

2. An insertion probe for a backscatter soot sensor according to claim 1, characterized in that: A back-blowing fan is installed on the bracket and is communicated with the insertion pipe through a back-blowing pipe.

3. An insertion probe for a backscatter soot sensor according to claim 1, wherein: The measuring shell is movably arranged in the insertion pipe, a rack rod is arranged in the insertion pipe along the length direction of the insertion pipe, the end of the rack rod is connected with the outer wall of the measuring shell, a step motor is arranged in the insertion pipe, and the step motor is in transmission connection with the rack rod.

4. An insertion probe for a backscatter soot sensor according to claim 1, wherein: Openings are arranged at the two ends of the insertion pipe.

5. An insertion probe for a backscatter soot sensor according to claim 1, wherein: A gap is left between the measuring shell and the insertion pipe.

6. An insertion probe for a backscatter soot sensor according to claim 1, wherein: The outer edge of the second lens abuts against the inner wall surface of the measuring shell; the first lens and the second lens are both convex lenses.

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