摘要
垃圾焚烧烟气余热利用可有效提高垃圾焚烧锅炉的能源利用效率,但是余热回收换热器面临着2个技术瓶颈:酸性气体凝结引起的低温腐蚀,飞灰沉积导致的传热恶化。对烟气中复杂酸性气体对金属材料的积灰腐蚀情况和换热管换热性能进行研究十分必要,为此,搭建现场实验平台,在不同入口油温工况下探究不同金属材质耐腐蚀性以及换热壁面换热性能的影响因素。实验结果表明,入口油温在110~177℃区间内,试管壁面无明显腐蚀现象且积灰较少,换热性能良好;80~110℃区间内,壁面积灰较多,腐蚀较轻,换热稳定;62~80℃区间内,有明显腐蚀现象出现,此时,不同材质的耐腐蚀程度为316L钢> ND钢>考登钢>20号钢>Q235。入口油温高于70℃时,试管传热稳定,换热效果在70℃时发生突变,并随温度降低换热效果变差。实验得出的结论对突破余热回收器面临的技术瓶颈具有一定的指导意义。
Waste incineration flue gas waste heat utilization can effectively improve the energy efficiency of waste incineration boilers, but the waste heat recovery heat exchanger has two technical bottlenecks: low-temperature corrosion caused by acid gas condensation, and heat transfer deterioration caused by fly ash deposition. It is necessary to study the fouling corrosion of metal materials by complex acid gases in the flue gas and the heat transfer performance of heat exchange tubes. Therefore, this paper built an on-site experimental platform to explore the factors affecting the corrosion resistance of different metal materials and the heat transfer performance of the heat exchange wall under different inlet oil temperature conditions. The experimental results show that there is no obvious corrosion phenomenon on the wall of the test tube, and there is less dust accumulation, and the heat exchange performance is good when the inlet oil temperature is within the range of 110℃ to177℃. In the range of 80℃ to110℃, the wall ash is more, the corrosion is lighter, and the heat exchange is stable. In the range of 62℃ to 80℃, obvious corrosion phenomena begin to appear. At this time, the corrosion resistance of different materials is 316 L steel>ND steel>Cowden steel>20 steel>Q235. The heat transfer of the test tube is stable, when the inlet oil temperature is higher than70℃.The heat exchange effect changes abruptly at 70℃, and the heat exchange effect becomes worse as the temperature decreases. The conclusions of the experiment have great significance to break through the technical bottleneck of the waste heat recovery device.
作者
栗劲松
张艺丹
岳萌
杜贤柳
严明伟
胡倩润
史月涛
LI Jinsong;ZHANG Yidan;YUE Meng;DU Xianliu;YAN Mingwei;HU Qianrun;SHI Yuetao(Shandong Engineering Laboratory for High-efficiency Energy Conservation and Energy Storage Technology&Equipment,(Shandong University),Jinan 250061,Shandong Province,China)
出处
《中国电机工程学报》
EI
CSCD
北大核心
2021年第24期8484-8493,共10页
Proceedings of the CSEE
基金
山东省自然科学基金项目(ZR201709180049)
山东省重点研发计划项目(2019GSF109023)。
关键词
余热利用
低温腐蚀
积灰性能
传热恶化
垃圾焚烧
waste heat utilization
low temperature corrosion
ash accumulation performance
heat transfer deterioration
waste incineration
