College of Metrology and Measurement Engineering, China Jiliang University, Hangzhou, 310018, China.
State Key Laboratory of Clean Energy Utilization, Institute for Thermal Power Engineering, Zhejiang University, Hangzhou, 310027, China.
Environ Sci Pollut Res Int. 2019 Apr;26(10):9707-9716. doi: 10.1007/s11356-019-04347-3. Epub 2019 Feb 7.
Four different mixed fuels consisted of leather waste, coal, and sewage sludge were combusted in a lab-scale entrained flow fluidized bed furnace. The influence of blending ratio on emission characteristics of SO, NO, HCl, particulate matter (PM), heavy metals, and polychlorinated dibenzo-p-dioxins and polychlorinated dibenzofurans (PCDD/Fs) was studied. Results showed that the mixing of coal with sewage sludge had a complex effect on the emission characteristics. On the one hand, with more sewage sludge blending in the mixed fuel, the acid gas pollutant (SO, NO) decreased a lot, and the recovery of volatile heavy metals (Cd, Pb) increased at the same time. Furthermore, the leaching toxicity of Cr in the fly ash and bottom ash went down below the national standard with the adding of sewage sludge. On the other hand, the mixing of sewage sludge which consisted of more ash content resulted in the increase of the PM emission. Moreover, the high content of Cu and chlorine in the sewage sludge can promote the formation of polychlorinated dibenzo-p-dioxins and polychlorinated dibenzofurans (PCDD/Fs) when the fuel 3 and 4 were combusted. Most importantly, the concentration of toxic PCDD/Fs in the flue gas produced from fuel 3 and fuel 4 was successfully controlled down below 0.20 ng I-TEQ/Nm by the active carbon.
四种不同的混合燃料由皮革废物、煤和污水污泥组成，在实验室规模的夹带流流化床炉中燃烧。研究了掺混比对 SO、NO、HCl、颗粒物（PM）、重金属以及多氯二苯并对二恶英和多氯二苯并呋喃（PCDD/Fs）排放特性的影响。结果表明，煤与污水污泥混合对排放特性有复杂的影响。一方面，随着混合燃料中污水污泥掺混量的增加，酸性气体污染物（SO、NO）大量减少，同时挥发性重金属（Cd、Pb）的回收增加。此外，随着污水污泥的添加，飞灰和底灰中 Cr 的浸出毒性下降到国家标准以下。另一方面，由于灰分含量较高的污水污泥的混合导致 PM 排放量增加。此外，污水污泥中高含量的 Cu 和 Cl 可以促进燃料 3 和 4 燃烧时多氯二苯并对二恶英和多氯二苯并呋喃（PCDD/Fs）的形成。最重要的是，通过活性炭成功地将燃料 3 和燃料 4 产生的烟道气中有毒 PCDD/Fs 的浓度控制在 0.20 ng I-TEQ/Nm 以下。
