Dioxin prevention and control technology for whole process of iron and steel organic hazardous waste pyrolysis incineration and purification process
In order to reduce the toxic properties of dioxin in the pyrolysis and purification process of organic hazardous waste and realize the efficient co-disposal function of organic hazardous waste and iron and steel process,the formation mechanism of dioxin and the release law of dioxin during the pyrolysis of organic solid waste are sorted out,the migration law of dioxin in the pyrolysis process of iron and steel organic hazardous waste rotary kiln is analyzed,the dioxin content in solid phase pyrolysis slag is detected,and the adsorption-regeneration mechanism and cyclic adsorption-regeneration properties of granular activated carbon on dioxin are investigated.The results show that the pyrolysis-incineration treatment process can purify the acid gases(HCl,SO2,H2S,etc.)in the flammable gases in advance,and the whole process can maintain a reducing atmosphere,which can effectively inhibit the synthesis of precursors and the chlorination reaction.The dioxin content detected in the solid-phase pyrolysis slag after pyrolysis is very low,which is far lower than the national hazardous waste identification standard,so it is proved that the temperature-controlled oxygen pyrolysis environment can inhibit the formation of dioxin;the results of incineration gas test show that activated carbon has a strong cyclic adsorption/thermal decomposition ability of dioxin.The new technology of dioxin prevention and control in the whole process of temperature control,oxygen control,pyrolysis and incineration of iron and steel organic hazardous wastes developed based on the activated carbon moving bed process can synergistically remove a variety of pollutants.
iron and steel industryorganic hazardous wastepyrolysis-incinerationdioxinactivated carbon
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