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二噁英类物质是目前已知的化合物中毒性最大的物质之一,主要来源于固体废物的燃烧过程和含氯工业产品的生产过程。本文利用烧结杯中试装置模拟热风烧结过程,研究了烧结料中焦粉含量、烧结热风温度和热风含氧量三个因素对二噁英生成的影响,利用高分辨色谱/高分辨质谱(HRGC/HRMS)测定气相以及飞灰中的二噁英。试验结果显示,二噁英生成量随焦粉含量减少而增加;随热风温度和含氧量的升高,二噁英生成量先增加后减少。在本试验条件下,减焦10%、200℃热风、含氧量19%时,二噁英生成量最小。
Dioxins are one of the most toxic substances known to date, mainly due to the combustion of solid wastes and the production of chlorine-containing industrial products. In this paper, the sinter cup pilot plant was used to simulate the hot-air sintering process. The effects of coke powder content, hot blast temperature and hot air oxygen content on dioxin formation were studied. High-resolution and high-resolution mass spectrometry (HRGC / HRMS) Determination of dioxins in the gas phase and fly ash. The results showed that the amount of dioxin increased with the decrease of coke content. With the increase of hot air temperature and oxygen content, the amount of dioxin increased firstly and then decreased. Under the test conditions, the amount of dioxin generated is the smallest when the temperature is reduced by 10%, the hot air at 200 ℃ and the oxygen content is 19%.