高氟高氯含盐危废高温熔融燃烧反应特性研究

Study on the Reaction Characteristics of High Temperature Melting Combustion of High Fluorine, High Chlorine, and Salt Containing Hazardous Waste

本文首先利用ICP-OES/MS电感耦合等离子发射光谱/质谱联用仪以及热值仪分析了不同形态的高氟高氯含盐危废组分及热值。然后在MY熔融炉中,欠氧条件下,通过添加不同添加剂研究其对不同形态下高氟高氯含盐危废高温熔融燃烧反应特性的影响。结果表明,NaF对高氟高氯含盐危废燃烧残渣起到较好的助熔作用,对固体危废助熔效果优于半固体及浆状体;CaO对高温残渣起到一定润滑作用,增加了高温残渣的流动性,对F/Cl元素的固定效果较原样提高了32%左右,但熔融流动温度较高且添加量较难控制;NaF和CaO两者混合样协同含硅纤维与飞灰助溶剂对不同形态下高氟高氯含盐危废高温熔融燃烧的作用优于添加单一的助溶剂,其中协同添加飞灰与含硅纤维助溶剂对不同危废高温熔融燃烧效果优于NaF和CaO混合助溶剂,主要原因在于飞灰与含硅纤维混合助溶剂所含钠盐与二氧化硅与物料中氧化钙及氧化亚铁形成低熔点熔盐络合物。

This article first analyzes the components and calorific value of different forms of high fluorine and high chlorine salt containing hazardous waste using ICP-OES/MS inductively coupled plasma emission spectrometry/mass spectrometry and calorific value analyzer.Then,in the MY melting furnace,under oxygen deficient conditions,the article studies the effects of different additives on the high-temperature melting combustion reaction characteristics of high fluorine,high chlorine,and salt containing hazardous waste in different forms.The results show that NaF has a good melting effect on the combustion residue of high fluorine,high chlorine,and salt containing hazardous waste,and its melting effect on solid hazardous waste is better than that of semi solid and slurry;CaO has a certain lubricating effect on high-temperature residue,increasing its fluidity,and increasing its fixation effect on F/Cl elements by about 32%compared to the original sample.However,the melting flow temperature is high and the addition amount is difficult to control;The synergistic effect of NaF and CaO mixed samples containing silicon fibers and fly ash co solvents on the high-temperature melting combustion of high fluorine,high chlorine,and salt hazardous waste in different forms is better than that of adding a single co solvent.Among them,the synergistic effect of adding fly ash and silicon fiber co solvents on the high-temperature melting combustion of different hazardous waste is better than that of NaF and CaO mixed co solvents,The main reason is that the sodium salt in the mixed solvent of fly ash and silicon containing fibers forms a low melting point molten salt complex with silica and calcium oxide and ferrous oxide in the material.