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Device and method for measurement of diameters and mass concentration of particles in smoke dust

A technology of mass concentration and particles, applied in measuring devices, particle and sedimentation analysis, particle size analysis, etc., can solve problems such as result deviation and lack of real-time particle size information

Active Publication Date: 2017-04-05
HUAZHONG UNIV OF SCI & TECH
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Problems solved by technology

[0005] Aiming at the problem that the existing light scattering measurement of the mass concentration of particulate matter lacks real-time particle size information and results in deviations, the present invention provides a device and method for simultaneously measuring the particle size and mass concentration of particles in smoke and dust. A light intensity detector and a moving second light intensity detector, so that the mass concentration of particles in the measured smoke is not affected by their particle size

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  • Device and method for measurement of diameters and mass concentration of particles in smoke dust
  • Device and method for measurement of diameters and mass concentration of particles in smoke dust
  • Device and method for measurement of diameters and mass concentration of particles in smoke dust

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Embodiment 1

[0077] figure 1 It is a front view of Embodiment 1, reflecting the overall structure of the device, figure 2 It is a top view of Embodiment 1, which reflects the design principle of the optical path of the device.

[0078] In this embodiment, a stable concentration ρ of 4 mg / m is generated by an aerosol generator 3 Quartz soot particles (measured by a low-voltage electronic impactor), the soot airflow enters the light scattering measurement area through a specially designed intake pipe 101, the flow rate is 10L / min, and the light scattering measurement area is protected by sheath gas (omitted in the figure), the flow The diameter of the nozzle in front of the light scattering measurement area is 3mm; the inner diameter of the air outlet pipe 102 is 10mm; the extraction flow rate of the vacuum pump 103 is 15L / min.

[0079] The laser 201 uses a 633nm red laser light source. After the beam is collimated by the beam collimator 202, the diameter of the light spot is 6 mm. After ...

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Abstract

The invention provides a device and method for simultaneous measurement of diameters and a mass concentration of particles in smoke dust. The device comprises a laser source, a first light intensity detector, a second light intensity detector and a computing center. The laser source is used for emitting one-wavelength laser to smoke dust so that scattered light is formed. A detection direction of the first light intensity detector and an exit direction of the one-wavelength laser form an included angle of 5-60 degrees. The first light intensity detector is used for acquiring first scattered light intensity. A detection direction of the second light intensity detector and an exit direction of the one-wavelength laser form an included angle theta of theta 1 to theta N. The second light intensity detector is used for acquiring second scattered light intensity I theta. The computing center is used for acquiring diameters and a mass concentration of particles in smoke dust according to the first scattered light intensity and second scattered light intensity I theta. The device and method solve the problem that the measurement result of the traditional light scattering method is influenced by particle diameters and ensure measurement real-time performance and accuracy.

Description

technical field [0001] The invention belongs to the field of environmental monitoring, and more particularly, relates to a device and method for simultaneously measuring the particle size and mass concentration of particles in smoke. Background technique [0002] With the increasingly stringent pollutant emission standards of power plants, accurate monitoring of various low-concentration pollutants in the flue is the premise of environmental protection evaluation. Among various pollutants, low-concentration smoke and dust monitoring is the difficulty and focus of current emission detection. [0003] With the development of laser technology and optical instruments, there are more and more applications of lasers for smoke and particle detection. At present, the main methods of measuring using optical principles include extinction method and light scattering method. Among them, the light scattering method is based on the fact that when light of a certain wavelength is irradiat...

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Application Information

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IPC IPC(8): G01N15/02G01N15/06
CPCG01N15/0211G01N15/06G01N15/075
Inventor 刘小伟陈栋徐明厚崔江韩金克江盟
Owner HUAZHONG UNIV OF SCI & TECH
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