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Flue gas content laser on-line detection method and system

A technology of gas content and detection system, which is applied in measurement devices, color/spectral property measurement, material analysis by optical means, etc., can solve the problem that optical gas sensors cannot achieve accurate measurement, and achieve easy maintenance and work reliability. High, ensure the effect of normal operation

Active Publication Date: 2012-02-15
XIAN YIDA INFORMATION SYST
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Problems solved by technology

[0006] In order to solve the technical problem that the existing optical gas sensor cannot achieve accurate measurement, the present invention provides a method and system for laser online detection of flue gas content

Method used

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  • Flue gas content laser on-line detection method and system
  • Flue gas content laser on-line detection method and system
  • Flue gas content laser on-line detection method and system

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Embodiment Construction

[0042] see figure 1 and figure 2, the flue gas content laser on-line detection system of the present invention adopts through-beam optical measurement, mainly including a light drive unit, a light emission unit, a light signal detection unit, an electrical signal transmission unit, an instrument air distribution unit, a central control cabinet, and an industrial computer Wait.

[0043] The optical drive unit is used to generate modulated laser light, including a function generator and a dual-frequency modulation signal synthesis circuit, a semiconductor laser, a semiconductor laser drive circuit, and a semiconductor laser temperature control circuit; after the system is powered on, the function generator generates two signals of different frequencies , These two signals are respectively sent to the semiconductor laser drive circuit and the subsequent circuit for signal processing, demodulation, and sampling. After the semiconductor laser drive circuit synthesizes the signal...

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Abstract

The invention relates to a flue gas content laser on-line detection method and a system. The system provided by the invention comprises a photic driving unit, a light emitting unit, an optical signal detection unit, an electric signal transmission unit, a central control cabinet and an industrial control computer. The method provided by the invention comprises the following steps of: allowing double-frequency modulated laser to pass through a background gas and then pass through a spectroscope, directly receiving the reflected laser by a photo-detector, allowing the laser which passes throughthe spectroscope to travel through flue gas and to be received by another photo-detector; and processing electric signals outputted from the two photo-detectors to obtain the detection signal. By theadoption of the sensing structure of two light beams, the wavelength modulation spectrum technology and the phase lock amplification technology, the technical issue of measurement accuracy by presentoptical gas sensors is improved.

Description

technical field [0001] The invention relates to a method for sensitive gas content in flue gas and a corresponding optical gas sensor. Background technique [0002] In the production process of the refinery, the control of the content of oxygen, carbon monoxide and carbon dioxide in the flue gas is not only related to the quality and output of the refinery, but also involves the power consumption of the main fan. At present, the detection of oxygen, carbon monoxide and carbon dioxide content in the flue gas mainly adopts the optical gas sensor system installed at the inlet and outlet of the three-stage cyclone separator. [0003] Optical gas sensors are mainly gas sensors based on the principle of spectral absorption, mainly infrared absorption gas analyzers. Since the infrared absorption peaks of different gases are different, the gas is detected by measuring and analyzing the infrared absorption peaks. The main advantages of optical gas sensors are fast response time, hi...

Claims

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Application Information

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IPC IPC(8): G01N21/31G01N21/35G01N21/3504
Inventor 黄元忠史朝阳
Owner XIAN YIDA INFORMATION SYST
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