Mercury vapor continuous monitoring device and monitoring method based on diode laser

A diode laser and monitoring device technology, which is used in measurement devices, material analysis by optical means, and testing of moving fluids/granular solids, etc., can solve the problems of complex system structure and poor real-time monitoring of mercury emissions.

Active Publication Date: 2012-07-18
SUZHOU RUILAN ENVIRONMENTAL PROTECTION TECHCO LTD
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0003] The purpose of the present invention is to solve the problem of complex system structure and poor real-time monitoring of mercury e

Method used

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  • Mercury vapor continuous monitoring device and monitoring method based on diode laser
  • Mercury vapor continuous monitoring device and monitoring method based on diode laser
  • Mercury vapor continuous monitoring device and monitoring method based on diode laser

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specific Embodiment approach 1

[0042] Specific implementation mode one: the following combination figure 1 Describe this embodiment, the mercury gas continuous monitoring device based on diode laser described in this embodiment, it is made up of signal generator 1, the first laser diode controller 2-1, the second laser diode controller 2-2 , the first laser diode 3-1, the second laser diode 3-2, the first reflector 4, the dichroic mirror 5, the first convex lens 6, the BBO crystal 7, the second convex lens 8, the dichroic prism 9, the second reflection Mirror 10, beam splitter 11, sample cell 12-1, reference cell 12-2, first optical filter 13-1, second optical filter 13-2, first detector 14-1, second detector 14 -2 and a data acquisition analyzer 15,

[0043] The control signal output end of the first laser diode controller 2-1 is connected to the control signal input end of the first laser diode 3-1, and the laser beam emitted by the first laser diode 3-1 is incident on the front of the dichroic mirror 5 ...

specific Embodiment approach 2

[0052] Embodiment 2: This embodiment is a further description of Embodiment 1. The wavelength of the laser beam emitted by the first laser diode 3-1 is λ 1 and the laser beam wavelength λ emitted by the second laser diode 3-2 2 satisfy 1 / λ 1 +1 / λ 2 =1 / 254 relationship, the unit of the wavelength is nm;

[0053] The transmittance of the dichroic mirror 5 to the laser beam emitted by the first laser diode 3-1 is greater than 90%, and the reflectivity of the dichroic mirror 5 to the laser beam emitted by the second laser diode 3-2 is greater than 90%.

specific Embodiment approach 3

[0054] Specific embodiment three: this embodiment is a further description of embodiment one or two, the product of the concentration of mercury vapor in the reference cell 12-2 and the optical path length in the reference cell is 50 μg / m 2 ~500μg / m 2 .

[0055] The concentration of mercury vapor in the reference cell 12-2 can make the maximum absorption rate of light near the wavelength of 254nm reach 5%-50%.

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Abstract

The invention provides a mercury vapor continuous monitoring device and monitoring method based on diode laser, belonging to the technical field of mercury vapor monitoring. The invention enables the problems that a conventional mercury vapor measuring system has a complex structure and real-time monitoring of mercury emission in conventional mercury vapor measuring is poor to be overcome. The monitoring device comprises a signal generator, a first laser diode controller, a second laser diode controller, a first laser diode, a second laser diode, a first reflector, a dichroic beam combiner, afirst convex lens, BBO crystals, a second convex lens, a beam splitter prism, a second reflector, a spectroscope, a sample cell, a reference cell, a first optical filter, a second optical filter, a first detector, a second detector and a data acquisition analyzer. According to the monitoring method, diode laser absorption spectroscopy is used to realize continuous monitoring of the concentration of mercury vapor, and spectral information of reference gas is utilized to realize selective identification and quantitative detection of gaseous elemental mercury, thereby eliminating interference brought by gas like sulfur dioxide and nitrogen dioxide. The monitoring device and the monitoring method provided in the invention are used for on-line monitoring of mercury vapor.

Description

technical field [0001] The invention relates to a continuous monitoring device and method for mercury gas based on a diode laser, belonging to the technical field of mercury gas monitoring. Background technique [0002] The main form of mercury pollutants in coal-fired flue gas is gaseous elemental mercury, and its total mercury content can be measured by converting other forms of mercury into gaseous elemental mercury by means of thermocatalysis or chemical conversion. The monitoring methods of mercury emission from coal combustion are mainly divided into two categories: wet chemical method and online analysis method. The currently widely used standard methods for measuring mercury are based on the principle of wet chemistry. Although these methods can provide high sensitivity, they are time-consuming and count in days, making it difficult to provide real-time monitoring data. Compared with the mature wet chemical method, the online analysis method with real-time advantage...

Claims

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Application Information

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IPC IPC(8): G01N21/17G01N21/85
Inventor 娄秀涛袁承勋瑞小川张治国吴少华
Owner SUZHOU RUILAN ENVIRONMENTAL PROTECTION TECHCO LTD
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