氟塑料换热器应用于超低排放燃煤机组的可行性研究

摘要

超低排放机组的水媒管式烟气换热器长期在酸露点温度以下服役，面临冷凝酸液腐蚀、积垢等问题，选择合适的材料才能保证设备的安全稳定运行。相比于传统的金属材料，聚四氟乙烯、可熔性聚四氟乙烯以及氟化乙烯丙烯共聚物等氟塑料在耐腐蚀、抗积灰方面具有显著的优势。从材料特性、换热器设计、经济性等方面，对氟塑料换热器在超低排放燃煤机组中的应用可行性进行了研究。%Water medium heat pipe gas-gas heater (WGGH) of coal-fired power generating units with ultra-low emission is long in service under acid dew point temperature and faces condensed acid liquor corrosion, scal-ing, etc. To ensure operation safety and stability of generating units, proper materials must be chosen. Com-pared with traditional metallic materials, fluoroplastics such as PTFE, PFA and FEP are advantageous in cor-rosion resistance and dust mitigation. Application feasibility of fluoroplastic heat exchanger in coal-fired power generating units with ultra-low emission in terms of material property, heat exchanger design, economical effi-ciency, etc.