硫酸铵和尿素抑制飞灰合成二(口恶)英

二(口恶)英(PCDD/Fs)排放制约了当前焚烧技术在垃圾处置和资源化利用领域的应用和推广。研究了硫酸铵和尿素在不同温度下对垃圾焚烧飞灰合成PCDD/Fs的抑制能力。实验结果表明:高温下(650℃)硫酸铵和尿素对PCDD/Fs合成具有更高的抑制效率,但高温下飞灰合成PCDD/Fs量远低于低温下(350℃)的生成量;PCDD/Fs的降低量均主要来自于PCDFs的减少,并且低温下TeCDF减少量最大,而高温下减少最多的同系物为OCDF。由于实际烟道中,高温处投入的抑制剂会进入低温段继续产生抑制作用,所以仍需要更多的研究正确评价抑制剂的抑制效果和最优使用温度。

Inhibition of PCDD/Fs formation from fly ash by ammonium sulfate and urea

At present,the emission of polychlorinated dibenzo-p-dioxins and dibenzofurans(PCDD/Fs)has hampered the application of combustion technology in waste clean treatment and waste to energy utilization.This study experimentally investigated the inhibition of PCDD/Fs formation from fly ash by ammonium sulfate and urea at different temperatures.Some key observations were reported.Both inhibitors had higher inhibition efficiency at a high temperature(650℃)than a low temperature(350℃),while the production of PCDD/Fs at 650℃ was quite small; the main reduction of PCDD/Fs was from PCDFs,as well as,the most significant reduction of homologue was TeCDF at a low temperature(350℃)and OCDF at 650℃.In a full scale incinerator,the chemical additives injected at the high temperature section could enter the low temperature area and continued to inhibit dioxin formation,so it is necessary to do more work to evaluate different inhibitors for PCDD/Fs formation and figure out the optimal injecting temperature.