垃圾焚烧厂除尘器低温腐蚀行为研究  

Research on Low-Temperature Corrosion Behavior of Dust Collector of Waste Incineration Plant

作　　者：罗茂亮 张秀菊 周巧燕 康佳 郭光召 王靓 刘欢 LUO Maoliang;ZHANG Xiuju;ZHOU Qiaoyan;KANG Jia;GUO Guangzhao;WANG Liang;LIU Huan(School of Energy and Power Engineering,Huazhong University of Science and Technology,Wuhan 430074,China;School of Mechanical and Power Engineering,Nanjing University of Technology,Nanjing 211816,China;Grandblue(Foshan)Green Electricity Solid Waste Management Co.,Ltd.,Foshan 528200,China;China Power Hua Chuang(Suzhou)Eelectricity Technology Research Co.,Ltd.,Suzhou 215134,China)

机构地区：[1]华中科技大学能源与动力工程学院,湖北武汉430074 [2]南京工业大学机械与动力工程学院,江苏南京211816 [3]瀚蓝绿电固废处理(佛山)有限公司,广东佛山528225 [4]中电华创(苏州)电力技术研究有限公司,江苏苏州215134

出　　处：《材料保护》2025年第4期70-77,共8页Materials Protection

基　　金：国家自然科学基金(52206143)。

摘　　要：垃圾焚烧厂尾部烟道的低温腐蚀问题制约着焚烧炉的安全稳定运行。本研究针对沿海某垃圾焚烧厂除尘器灰斗的低温腐蚀问题,通过分析腐蚀产物及表面沉积灰的微观形貌、元素组成、晶相组成及离子溶出特性,揭示了烟气冷凝酸液与沉积灰共同作用下的低温腐蚀机制。结果表明:灰斗腐蚀产物中除了铁氧化物,表面还粘附着大量富含碱金属盐(NaCl、KCl、CaClOH等)的沉积灰。在冷凝酸液与沉积灰共同作用下,除尘器的腐蚀介质中包含Cl^(-)、Ca^(2+)、K^(+)、Na^(+)等影响设备表面电化学腐蚀的离子,其中Ca^(2+)溶出浓度达0.35 mol/L,占阳离子总浓度81.4%,Cl^(-)溶出浓度达0.55 mol/L,占阴离子总浓度96.5%。电化学阻抗谱测试结果进一步表明,Ca^(2+)与Cl^(-)的存在显著降低了电化学腐蚀反应的电荷转移电阻,是影响腐蚀的关键离子。本研究为用于低温腐蚀防护的表面涂层设计提供了指导意义。The low-temperature corrosion problem of the tail flue of a waste incineration plant restricts the safe and stable operation of the incinerator.In this study,for the low-temperature corrosion problem of the dust collector ash hopper of a coastal waste incineration plant,the low-temperature corrosion mechanism under the joint action offlue gas condensed acid liquid and deposited ash was revealed by analyzing the microscopic morphology,elemental composition,crystalline composition,and ionic dissolution characteristics of the corrosion products and the deposited ash on the surface.Results showed that the corrosion products in the hopper primarily consisted of iron oxides,and a large amount of deposited ash rich in alkali metal salts(NaCl,KCl,CaClOH,etc.)adhered to the surface.Under the combined action of condensed acid liquid and deposited ash,the corrosive medium in the dust collector contained ions(Cl^(-)、Ca^(2+)、K^(+)、Na^(+))that significantly influenced electro-chemical corrosion on equipment surfaces.Among them,the Ca^(2+) dissolution concentration reached 0.35 mol/L,accounting for 81.4%of the total cation concentration,and the Cl^(-)dissolution concentration reached 0.55 mol/L,accounting for 96.5%of the total anion concentration.The electrochemical impedance spectroscopy test results further indicated that Ca^(2+)and Cl^(-)significantly reduced the charge transfer resistance of the electrochemical corrosion reaction,and the two ions were the key ions affecting the corrosion.In general,this study provided guidelines for the design of surface coatings used for low-temperature corrosion protection.

关 键 词：垃圾焚烧 低温腐蚀 沉积灰 冷凝酸液 

分 类 号：TG172[金属学及工艺—金属表面处理]