硫氨基循环抑制烟气二噁英生成的试验研究

Experimental study on dioxin inhibition in incinerators by S-N recycling

新型硫氨基物质对二噁英低温从头合成具有良好的抑制效果,但尚未在实际焚烧炉中应用.本文借助烟气循环抑制和飞灰低温热处置联用控制二噁英排放中试系统(500 Nm^3·h^(-1)),开展了硫氨基循环抑制实际焚烧炉烟气二噁英排放的研究.试验结果表明,硫氨基抑制气氛能在该系统中循环累积,该系统对二噁英阻滞率达95%以上,烟气二噁英排放浓度低于最新国家环保标准0.1 ng·Nm-~3(以I-TEQ计).该新型硫氨基循环抑制技术对实际废物焚烧炉二噁英的减排控制具有重要指导价值.

S-N-containing compounds acted as effective dioxin inhibitors in small-scale experiments. They are however yet to be applied in an actual waste incinerator. In this study, a pilot-scale system（500 Nm^3·h^（-1）） was installed as a bypass to an actual hazardous waste incinerator, featuring both thermal treatment of fly ash to destroy dioxins and recycling of S-N-containing compounds. Preliminary results indicate that this system maintains a high concentration of S-N suppressants in its atmosphere and that the inhibition efficiency reaches more than 95% of the original dioxins concentration in the flue gas and attains values lower than the new national standard of 0.1 ng I-TEQ·Nm-~3. Recycling of suppressant provides an important guidance for future full scale application and dioxins reduction in actual waste incinerators.