尿素造粒プラントにおけるエーロゾル放出物の低減方法
- 专利权人:
- 发明人:
- 申请号：
- JP20110508818
- 公开号：
- JP5775813(B2)
- 申请日:
- 2009.05.04
- 申请国别(地区):
- 日本
- 年份:
- 2015
- 代理人:
- 摘要：
The invention relates to a process for the granulation of a concentrated urea solution whereas the granulation produces a urea granulate and a dust laden air, which is then fed into a dust scrubber which removes the coarser dust with a less concentrated urea solution and which releases a residual air comprising air with ammonia, carbon dioxide water and an aerosol comprising mainly ammonium isocyanate and a part of very fine urea sublimate, whereas the aerosol is then separated off and fed into a urea recovery unit which comprises a recovery unit where the ammonium isocyanate reacts with steam to form urea which is then redirected into the dust scrubber as a less concentrated urea solution, and the residual air is directed into an acidic scrubber which releases clean air into the atmosphere which finally leads to a recycling of the aerosol of ammonium cyanate into urea. The invention also relates to a device for carrying out the related process.
- 来源网站：
- 中国工程科技知识中心
