Open AccessPrevention and Countermeasures of Urea Crystallization in SCR Urea Pyrolysis System
Author(s) -
Jingcheng Su,
Feng Xue,
Peipei Li,
Yulong Zhang
Publication year - 2021
Publication title -
iop conference series. earth and environmental science
Language(s) - English
Resource type - Journals
eISSN - 1755-1307
pISSN - 1755-1315
DOI - 10.1088/1755-1315/631/1/012012
Subject(s) - crystallization , urea , pyrolysis , ammonia , process (computing) , process engineering , materials science , chemical engineering , computer science , chemistry , engineering , organic chemistry , operating system
The reasons for urea crystallization in the SCR urea pyrolysis system are analyzed, and system design, flow field control, equipment selection, process water and compressed air quality requirements and other aspects are optimized and selected, in order to improve the urea crystallization of pyrolysis furnace Phenomenon to effectively prevent and provide targeted countermeasures. In the process of pyrolysis of urea to produce ammonia, a slight deviation will easily form crystals. In severe cases, pipeline blockage and insufficient ammonia supply in the system will occur. However, based on the feedback of multiple application projects in the past ten years, there has not been a situation that has affected the operation of the pyrolysis system due to serious urea crystallization, and as long as the system design, flow field control, equipment selection, process water and compression Optimization and selection of air quality requirements and other aspects can effectively prevent and control the phenomenon of urea crystallization. The urea pyrolysis ammonia production system is a safe and effective source of ammonia, which can ensure the long-term safe and stable operation of the SCR system, so it will be more and more widely used.