采用２０Ｇ 省煤器的余热锅炉，由于腐蚀严重，生产周期特别短，因此，在对腐蚀原因进行了分析，采用耐低温露点腐蚀ＮＤ 钢制造的省煤器，提高了省煤器的使用周期，产生了巨大的经济效益。 Due to the serious corrosion and the short production cycle, the waste heat boiler with 20G economizer is used. Therefore, after analysis of the causes of corrosion, the economizer made of ND steel with low temperature dew point is used to improve the life cycle of the economizer, Produced a huge economic benefits.