铸铁式空气预热器及工业应用

铸铁具有很强的耐硫酸腐蚀能力,因此,采用铸铁材料制作的空气预热器具有耐腐蚀、长寿命的特点,特别适合在工业炉烟气余热回收系统中的低温段采用。介绍了铸铁式空气预热器在国内锅炉、钢铁和石化行业过去和现在的工业应用情况,以及中国石化近年开发的大型铸铁板式空气预热器的最新进展。目前,国产大型铸铁板式空气预热器已在多台火焰加热炉的设计中采用,设计、制造、安装技术日臻成熟。2010年4月,武汉石化2号常减压蒸馏装置投用了国产第一台新型铸铁板式空气预热器,运行19个月,加热炉热效率一直稳定在92%以上,排烟温度一直稳定在130℃以下,运行良好。

Cast iron air preheater and commercial application

As cast iron has a high corrosion resistance performance,the air preheater fabricated from cast iron material is resistant to corrosion and extended in service life.It is especially applicable for the low-temperature section of waste heat recovery system for industry furnace flue gas.The past and present applications of cast iron air preheaters in boiler,iron & steel production and petrochemical industries are described in detail,and the new development of large cast iron plate air preheater developed by SINOPEC in recent years is presented.Up to now,the large cast iron plate air preheaters have been selected in the design of a large number of fired heaters and its design,fabrication and installation technologies are becoming commercially proven.In April,2010,China’s first new type cast iron plate air preheater came on stream in No.2 atmospheric-vacuum distillation unit in No.2 atmospheric-vacuum distillation unit in SINOPEC Wuhan Petrochemical Company.In 19 months’ operation,the heat efficiency of the furnace has been maintained at over 92% and the temperature of flue gas emission was lower than 130 ℃.The preheater has been operating smoothly ever since.