垃圾焚烧炉二恶英排放特性与减排技术展望

Dioxin Emissions Characteristics of a Waste Incinerator and Prospects of the Emissions Reduction Technologies

针对国内典型城市生活垃圾循环流化床垃圾焚烧炉二恶英的排放特性进行研究,发现二恶英主要来源于尾部烟气冷却过程中二恶英的低温再生成。适当地提高燃烧温度,有助于减少二恶英的生成。布袋除尘加活性炭喷射能有效抑制二恶英的排放,但应及时清灰和更换旧布袋,减少"记忆效应"的影响。本文最后总结了垃圾焚烧炉二恶英排放控制现状,并提出了一套新型多途径耦合全面控制垃圾焚烧炉二恶英低排放的集成技术系统。

Studied were the dioxin emissions characteristics of a domestically-made typical MSW( municipal solid waste) CFB( circulating fluidized bed) incinerator and discovered was the fact that the dioxin mainly comes from the reformation of dioxin at low temperatures in the cooling process of flue gases at the tail portion of the incinerator. To properly raise the combustion temperature can be favorable to reducing the amount of dioxin such formed. Dust removal by using bags plus a jet of activated carbon can effectively contain the emissions of dioxin,however,it is necessary to timely clear away the ash and replace the bags with new ones in order to lessen the influence of the "memory effect". Finally,the authors summarized the current status in control of dioxin emissions from waste incinerators and put forward a multi-approach-coupled integration technology system by comprehensively controlling the waste incineration process for low dioxin emissions.