Presents Hydro macroparticle urea granulation technology with fluid bed and the reasons,phenomena and harmfulness of vacuum pressure fluctuation,and discusses relative measures to solve the problem.

• 介绍海德鲁流化床大颗粒造粒技术及该系统造粒机负压波动的形成原因、现象以及危害,并提出相应解决方案。