Method for on-line monitoring dioxin by tunable laser spectrum with flight time mass spectrum

A technology of time-of-flight mass spectrometry and dioxins, which is applied in the field of online monitoring of dioxins by combining tunable laser spectroscopy with time-of-flight mass spectrometry, can solve the problems of poor operability and long test period, and achieve strong adaptability and operation convenient effect

Active Publication Date: 2005-07-20
浙江富春江环保科技研究有限公司
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Problems solved by technology

However, the disadvantage of this method is that there is a chemical reaction between the chemical reagent and the measured compound, the test period is longer, and the operability of the specific combustion system test is not strong

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  • Method for on-line monitoring dioxin by tunable laser spectrum with flight time mass spectrum
  • Method for on-line monitoring dioxin by tunable laser spectrum with flight time mass spectrum
  • Method for on-line monitoring dioxin by tunable laser spectrum with flight time mass spectrum

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Embodiment Construction

[0015] Existing studies have shown that there is an inevitable relationship between incomplete combustion products and dioxin formation in the combustion process, and the degree of correlation is very large, that is, incomplete combustion products are precursors of dioxins. There are many types of precursors of dioxins, from olefins to chlorobenzene, chlorophenols, biphenyls, polycyclic aromatic hydrocarbons, etc., and their concentrations are generally more than 20 times the concentration of dioxins, so the detection limit and Sensitivity requirements have dropped a lot, and some of them can already be detected online. Therefore, we propose a method for real-time online detection of the concentration and toxic equivalent of dioxins by detecting some reliable precursors of dioxins. From the degree of correlation and the difficulty of online detection, we select some of the most reliable precursors of dioxins as substitutes for real-time detection of dioxins, mainly including t...

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Abstract

The invention discloses a method for on-line monitoring er'eying by combining tunable laser light spectrum with flying time mass spectrum. It installs laser absorbing component and detector of a tunable laser light spectrograph on two opposite sides of pipeline diameter of a tested burning system, respectively, the gas is firstly detected by the laser absorbing component, the working current of a laser is regulated to 20-30A, the working length of the laser light is regulated to 112-281m, the gas to be detected is locked and after passing the detector, enters in the flying time mass photograph for detecting, a precursor is on-line detected in a selectively ionizing mode, then on-line concentration of er'eying total by the equivalent relation between fixed precursor and er'eying total. It is convenient to operate, strongly adaptive, not influenced by the dust in measuring environment, and able to quickly, accurately and real-timely monitor the concentration and toxic equivalent of trace pollutant er e ying.

Description

technical field [0001] The invention relates to a method for online monitoring of dioxins by combining tunable laser spectrum with time-of-flight mass spectrometry. Background technique [0002] Dioxin is a common name for polychlorinated dibenzo-p-dioxin (PCDD) and polychlorinated dibenzofuran (PCDF), which are carcinogenic, teratogenic and mutagenic Toxic substance. Especially the isomer substituted with 2,3,7,8-position chlorine is the most toxic (2,3,7,8-TCDD), which is a known first-class carcinogen in the world, and its toxicity is 50 times that of potassium cyanide. ~ 1000 times, and therefore received special attention. [0003] Studies have shown that the combustion process is the main source of dioxins in the environment (combustion described here refers to all strong oxidative exothermic and luminescent reactions, and incineration refers to the combustion reaction of waste, the same below). At present, my country's environmental standards for dioxin emissions a...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/39G01N30/72G01N30/78G01N35/00
Inventor 严建华李晓东陆胜勇池涌蒋旭光马增益王飞尹雪峰倪明江岑可法
Owner 浙江富春江环保科技研究有限公司
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