ZERO FORMATION OF DIOXINS AND SUPPRESSION OF DE NOVE SYNTHESIS

二恶英的零形成和新合成的抑制

• 批准号: 14205110
• 负责人: USUI Tateo
• 金额: $ 25.63万
• 依托单位: OSAKA UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (A)
• 财政年份: 2002
• 资助国家: 日本
• 起止时间: 2002 至 2003
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-14205110/
• 关键词: CaO chips; dechlorination; dioxins; furans (Dioxins); Electromagnetic wave; fly carbonaceous matters; high CO; CO_2 ratio; zero formation of Dioxins; 濃度・温度境界層の消散; PVC燃焼; 非平衡領域; COリッチ濃度境界層; 強制混合による濃度境界層の消散; CaO粒子充填層; 充填層

From our fundamental studies on combustion experiments and thermodynamic evaluations, it is clarified that dioxins/furans (Dioxins) are mainly formed at the thermodynamically heterogeneous site with high CO/CO_2 ratio, which is the boundary layer on the surface of the fly carbonaceous (C^*) matters remaining in combustion gas. Therefore, it is considered that Dioxins are hardly formed by the decomposition or the disappearance of the fly C^* matters and by the dechlorination from the fly C^* matters. The present study has investigated whether zero formation of Dioxins was achieved or not by the dechlorination from the fly C^* matters with CaO, and by the dispersion of the boundary layer with high CO/CO_2 ratio around the fly C^* matters through an irradiation of electromagnetic wave with high energy density to combustion gas.Electromagnetic wave was irradiated to an exhaust gas of PVC combustion, in which Dioxins concentration was 85 ng-TEQ/m^3 (s.t.p.). The irradiation conditions were the power of 1.8 kW, the frequency of 915 MHz, the irradiation time of 6 s, and the temperature of 423 K. Dioxins concentration after the irradiation of electromagnetic wave decreased to be 2.4 ng-TEQ/m3 (s.t.p.), the decomposition rate of about 97 %. It is regarded that a lot of Dioxins is decomposed by the dispersion of the boundary layer around the fly C^* matters, where Dioxins are formed, and by the decomposition or the burning out of the fly C^* matters with heating up. Decomposition rate of Dioxins are expected to improve more at higher temperature zone.By setting CaO chips bed in the high temperature zone, Dioxins extremely decreased from 1 ng-TEQ/m^3 (s.t.p.) to 0.007 ng-TEQ/m^3 (s.t.p.) because chlorine in and around the fly C* matters was dechlorinated to thermodynamically stable CaCl2. The dechlorination at the high temperature zone is very effective for zero formation of Dioxins.

通过燃烧实验和热力学评价的基础研究，阐明了二恶英/呋喃（Dioxins/furans，简称Dioxins）主要在燃烧气体中残留的飞碳（C^*）物质表面的边界层，即CO/CO_2比值较高的非均质位置生成。因此，可以认为二恶英几乎不会通过蝇C^* 物质的分解或消失以及蝇C^* 物质的脱氯而形成。本文研究了用CaO对飞灰C^* 物质脱氯，以及用高能量密度的电磁波对燃烧气体进行辐照，使飞灰C^* 物质周围高CO/CO_2比的边界层弥散，能否实现二恶英的零生成。其中二恶英的浓度为85 ng-TEQ/m^3（标准温度）。辐照条件为：功率1.8kW，频率915 MHz，辐照时间6s，温度423 K。电磁波辐照后二恶英浓度降至2.4 ng-TEQ/m3（s. t. p.），分解率在97%左右。据认为，大量二恶英是通过在二恶英形成的飞C^* 物质周围的边界层的扩散以及飞C^* 物质随加热而分解或燃烧而分解的。在高温区设置CaO屑床层，二恶英的分解率从1 ng-TEQ/m^3（s. t. p.）至0.007 ng-TEQ/m^3（s.t.p.）因为在苍蝇C* 物质中和周围的氯被脱氯成化学稳定的CaCl 2。高温区脱氯对二恶英的零生成非常有效。

项目成果

Hirotoshi KAWABATA, Tateo USUI, Hideki ONO-NAKAZATO, Masayuki TANABE, Katsukiyo MARUKAWA, Shigeta HARA, Toshihiro TANAKA: "Influence of Chlorine Forms and Dechlorination on Dioxins Formation/Suppression in the Combustion Processes"RESOURCES PROCESSING. Vo

Hirotoshi KAWABATA、Tateo USUI、Hideki Ono-Nakazato、Masayuki TANABE、Katsukiyo MARUKAWA、Shigeta HARA、Toshihiro TANAKA：“燃烧过程中氯的形式和脱氯对二恶英形成/抑制的影响”资源处理。

Hirotoshi KAWABATA, Tateo USUI, Hideki ONO-NAKAZATO, Masayuki TANABE, Katsukiyo MARUKAWA, Shigeta HARA, Toshihiro TANAKA: "Experimental Studies on the Factors Influencing the Formation of Dioxins in the Combustion Process"The Japan/Korea International Sym

Hirotoshi KAWABATA、Tateo USUI、Hideki Ono-Nakazato、Masayuki TANABE、Katsukiyo MARUKAWA、Shigeta HARA、Toshihiro TANAKA：“燃烧过程中影响二恶英形成的因素的实验研究”日韩国际研讨会

川端 弘俊, 丸川 雄浄, 碓井 建夫, 原 茂太, 田中 敏宏, 中里 英樹: "Fe・Cu・プラスチック系混合スクラップの高温処理過程におけるダイオキシン類ゼロ生成"9th Symposium on "Microjoining and Assembly Technology in Electronics". Vol.9. 377-382 (2003)

Hirotoshi Kawabata、Yuki Marukawa、Takeo Usui、Shigeta Hara、Toshihiro Tanaka、Hideki Nakazato：“混合铁/铜/塑料废料高温处理过程中二恶英的零产生”第九届“电子微连接与组装技术”研讨会卷9。377-382（2003）