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采用“稀磷酸氨化-多效浓缩结晶技术”生产工业磷酸一铵的过程中,利用饱和蒸汽在Ⅰ效加热器加热磷铵溶液后的冷凝水加热空气,替代热风炉燃烧天然气产生的磷铵湿结晶流化床干燥所需的热空气,并进行冷凝水加热干燥空气的可行性分析以及换热器选型计算。改造后,装置每年可节约天然气71 280 m~3,蒸汽冷凝水的低位热能得到合理利用。
In the process of producing industrial monoammonium phosphate by using “dilute phosphoric acid amidation - multi-effect concentration crystallization technique”, the condensed water heated by the first effect heater to heat the ammonium phosphate solution is used to heat the air instead of burning the natural gas by the hot stove Ammonium phosphate wet crystallization fluidized bed drying required hot air, and the feasibility of condensing water heating and drying air heat exchanger selection calculation. After the transformation, the device can save 71 280 m ~ 3 natural gas per year, and the low heat energy of steam condensate can be reasonably utilized.