The liquid ammonia with oil can produced biuret scale on the urea system in chemical fertilizer plant.The efficiency of heat exchanger and producing capacity of urea were reduced.

• 化肥厂原料液氨带油进入尿素系统,尿素设备的换热段高温部位产生一定量的缩二脲垢,导致换热效率和产品产量下降。