Flue gas analysis device and method based on ultraviolet differential technology

Abstract

The invention relates to a flue gas analysis device based on an ultraviolet difference technology, and a flue gas analysis method. The flue gas analysis device sequentially comprises an ultraviolet light source, a measuring cell, an optical fiber and a spectrograph, wherein a focusing lens and an optical fiber connection adjustment mechanism are arranged at the end, close to the optical fiber, of the measuring cell; the optical fiber connection adjustment mechanism is used for adjusting the front and back translation, relative to the measuring cell, of a longitudinal end face of the optical fiber so as to utilize the axial chromatic aberration of the focusing lens to enable ultraviolet light emitted by the ultraviolet light source to couple different spectral energy distributions in the optical fiber, thus obtaining the position of the longitudinal end face of the optical fiber with the maximum spectral energy distribution at the absorption wavelengths of all flue gas components by means of multiple adjustments during detection, improving the signal to noise ratio and enhancing the detection sensitivity of concentrations of all the flue gas components. The device and the method can adapt to detection of different sample gases to be detected.

Description

technical field [0001] The invention relates to a spectrum analysis device, in particular to a flue gas analysis device and method based on ultraviolet differential technology. Background technique [0002] In December 2015, the executive meeting of the State Council decided to fully implement ultra-low emission and energy-saving transformation of coal-fired units before 2020. The latest Air Pollution Prevention and Control Law came into effect on January 1, 2016. Local environmental protection departments have successively issued the most stringent emission standards in history, and the emission concentrations of smoke, sulfur dioxide, and nitrogen oxides should not exceed 10mg / m 3 、35mg / m 3 , 50mg / m 3 . [0003] Due to the complexity of the flue gas components in the ultra-low emission site and the low concentration of sulfur dioxide and nitrogen oxide emissions, most of the flue gas analyzers currently installed on site are conventional range analyzers, which can no l...

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Problems solved by technology

[0003] Due to the complexity of the flue gas components in the ultra-low emission site and the low concentration of sulfur dioxide and nitrogen oxide emissions, most of the flue gas analyzers currently installed on the site are conventional range analyzers, which can no longer meet the monitoring requirements. The existing flue gas analysis The instrument mainly has the following problems: 1. Some flue gas analyzers using infrared technology are easily affected by background gas interference in low-concentration areas; 2. Some ultraviolet flue gas analyzers use multiple reflection measurement cells to improve detection sensitivity. The multi-reflection measurement cell increases the complexity of the system, is less stable than the straight-through cell and increases the difficulty of on-site maintenance

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