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尿素合成塔是尿素制造过程的四大中心设备之一,处于高温、高压工作环境,其工作介质中由于氨基甲酸铵和尿素异构体氰酸铵的强腐蚀性,故对所用的制造材料(包括焊接材料)要求很高。随着合成尿素新工艺的发展,工艺参数进一步强化,如温度和压力提高,氧含量和氨碳比降低等,使介质的腐蚀性更强,因而对尿素设备的用材(包括焊接材料)提出了更高的耐腐蚀要求。 经过尿素制造新工艺的生产实践考验,荷兰凯洛格—大陆公司和中国化工建设总公司联合提出的
Urea synthesis tower is one of the four major central equipment in the urea manufacturing process. It is under high temperature and high pressure working environment. Due to the strong corrosiveness of ammonium carbamate and urea isomer ammonium cyanate in its working medium, Including welding materials) demanding. With the development of new urea synthesis process, the process parameters are further strengthened, such as the increase of temperature and pressure, the decrease of oxygen content and ammonia carbon ratio, which make the medium more corrosive. Therefore, the use of urea materials (including welding materials) Higher corrosion resistance requirements. After urea production of new technology manufacturing test, the Netherlands Kellogg - mainland China and China National Construction Chemical Corporation jointly proposed