An introduction to an energy-saving process flow selected for a 200 000 t/a ammonia synthesis unit was introduced. Calculations and comparisons were made for and between different processes of heat recovery, location of virgin gas and vent, and energy-saving refrigeration. The conclusion was that an ammonia converter should have an inlet and an outlet, the vent device should be placed after the coolexchanger, and the virgin gas should be located after the vent and before the ammonia cooler. Besides, the energy-saving lithium bromide refrigerating unit should be applied.%介绍了20万t/a合成氨装置节能流程的方案选择,通过对合成气入塔形式、新鲜气补气位置、放空位置和冷冻量节能等不同工艺流程的计算比较,选定反应气一进一出,放空气和新鲜气补气位置在冷交换器分氨后,采用溴化锂制冷的“双废锅双水冷双冷交”流程为合适的节能流程.
展开▼
