硫氨磷基阻滞剂对飞灰特性的影响及对二噁英的阻滞效果

阻滞剂技术由于操作简单、成本低和效率高等优点,被广泛应用于实际生活垃圾焚烧炉,逐渐成为控制二噁英生成的重要技术之一。选取某台典型循环流化床生活垃圾焚烧炉为研究对象,通过高精度给料设备向余热锅炉两侧喷射硫氨磷基阻滞剂,研究阻滞剂对飞灰物化特性影响及其对二噁英的阻滞效果。结果表明:硫氨磷基阻滞剂对飞灰中的PCDD/Fs有很好的阻滞效果,喷射阻滞剂后飞灰中PCDD/Fs毒性当量从2.31 ng I-TEQ/g降至0.23 ng I-TEQ/g,阻滞率达到90.0%;阻滞剂主要通过减少氯源、改变飞灰粒径及表面特性等实现飞灰中二噁英的高效阻滞。此外,阻滞剂对飞灰中部分重金属有一定的固化作用,其中对Pb固化效果最好,达到49.02%。该成果可为后续硫氨磷基阻滞剂的工业化应用提供技术支撑。

INFLUENCE OF S-N-P-INHIBITOR ON FLY ASH CHARACTERISTICS AND PCDD/Fs CONTENT

Due to its advantages of simple operation,low cost and high efficiency,inhibitors have been widely used in waste incinerators,and gradually become one of the important technologies to control dioxins.The effect of the inhibitor on fly ash characteristics and the concentration of PCDD/Fs in fly ash was studied by injecting the S-N-P-inhibitor into the heat recovery boiler of a typical circulating fluidized bed waste incinerator with high-precision feeding equipment.The results showed that the inhibitor decreased the content of PCDD/Fs in fly ash remarkably from 2.31 ng I-TEQ/g to 0.23 ng I-TEQ/g,with an inhibition efficiency of 90.0%,which was achieved through reducing the concentration of Cl₂ in flue gas,increasing particle size and decreasing the specific surface area of fly ash.In addition,inhibitors also exhibit stabilization function on heavy metals,especially for Pb (with a stabilization rate of 49.02%).This research can provide technical support for the subsequent industrial application of the S-N-P-inhibitor.