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A device and method for measuring particle size and mass concentration of particles in soot

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

Active Publication Date: 2019-03-08
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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  • A device and method for measuring particle size and mass concentration of particles in soot
  • A device and method for measuring particle size and mass concentration of particles in soot
  • A device and method for measuring particle size and mass concentration of particles in soot

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Embodiment 1

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

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

[0079] The laser 201 adopts a 633nm red laser light source. After the beam collimator 202 collimates the light beam, the spot diameter is 6 mm. After passing through the diaphragm 2...

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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 specifically relates to a device and a method for simultaneously measuring particle diameter and mass concentration of particles in smoke and dust. Background technique [0002] As the pollutant discharge standards of power plants become more and more stringent, accurate monitoring of various low-concentration pollutants in the flue is a prerequisite for environmental protection assessment. Among various pollutants, low-concentration soot monitoring is the difficulty and focus of current emission testing. [0003] With the development of laser technology and optical instruments, lasers are used more and more in the detection of smoke and particulate matter. At present, the main methods of measurement using optical principles are 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 ir...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N15/02G01N15/06
CPCG01N15/0211G01N15/06G01N2015/0693
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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