System for on-line detection of dioxin type trace organic pollutants in actual smoke

Abstract

The invention relates to a trace organic pollutant detection technology and aims at providing a system for on-line detection of dioxin type trace organic pollutants in actual smoke. A sampling device of the system is connected with a thermal desorption instrument and a sampling pump module respectively through a pipeline, and a heat tracing pipeline is arranged on the pipeline. A laser device can simultaneously output two types light beams of deep ultraviolet wavelength and tunable ultraviolet visible waveband, an optical lens set is arranged between a flight time mass spectrometer and the laser device, two beams of laser are combined and then enter a laser window of the flight time mass spectrometer. A sample inlet pipeline of the flight time mass spectrometer is connected with a calibration gas storage bottle and the thermal desorption instrument respectively. The system integrates a thermal desorption technology and flight time mass-spectrometric technique, overcomes the shortcomings of a sample detection technology, can rapidly reflect the dioxin discharge concentration of smoke in time and is high in precision and large in information amount. The system composition can be adjusted according to actual demands, the adaptation can be improved. Detection results can represent the combustion conditions in a furnace, and the incineration process control can be optimized.

Description

technical field

[0001] The invention relates to a detection technology of dioxin-like trace organic pollutants, in particular to real-time and rapid on-line detection of the concentration of dioxin-like trace organic pollutants in flue gas. Background technique

[0002] Dioxins are trace-level substances, and it is very difficult to accurately detect the concentration of dioxins in flue gas. The detection of dioxins is mainly based on off-line analysis by high-resolution gas chromatography / high-resolution mass spectrometry (HRGC / HRMS) after on-site sampling. Off-line analysis requires a tedious and complicated sample pretreatment process, and the measurement cycle usually takes at least 2 weeks, which is not only time-consuming, but also expensive chemical reagents and labor costs. Therefore, the detection of dioxins cannot be widely carried out, which has also become an important restrictive factor for the current comprehensive and limited control of dioxin emissions. [...

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