回收磷铵预中和反应尾气余热 降低浓缩汽耗的节能减排技术  

Energy saving and exhaust reduction technology for AP production by recovered waste heat from tail gas as the recycled heat resource for concentration

作　　者：张峰榛[1] 沈倩[1] 贺西林[1] 朱家骅[1] 王江平 郭仕伟 周仕飞 陆庆国 

机构地区：[1]四川大学矿产资源与可再生能源研究中心,四川成都610065 [2]宏福总公司瓮福磷肥厂,贵州福泉550501

出　　处：《磷肥与复肥》2008年第2期22-24,共3页Phosphate & Compound Fertilizer

基　　金：国家自然科学基金20476063;国家高技术研究发展(863)计划2006AA05Z235

摘　　要：首次提出DAP预中和反应尾气分流进行余热回收浓缩稀磷酸的磷铵节能减排工艺,源头减少湿线尾气水蒸气排放量,降低湿法磷酸浓缩能耗31.8%。经过大型工业化试验验证,其关键设备低温磷酸喷射降膜浓缩装置(换热面积560 m2)回收约80℃的DAP湿线尾气余热,可以使稀磷酸P2O5质量分数提高约12百分点,节能产生的直接经济效益在1.5年之内即可收回技改投资。A novel energy saving and exhaust reduction concentration with the heat recovered from the DAP tail gas is proposed for AP production, which results in the process, characterized by phosphoric acid exhausted from the pre-neutralization reactor, energy consumption reduced by 31.8% for concentration. It is demonstrated, through the experiment from the commercialized pilot equipment of jet falling film evaporator with 560 m^2 surfaces for heat exchange, that the P2O5 mass fraction of the dilute phosphoric acid can be increased by 12% with the DAP wet line tail gas under 80℃ as the heat source. The investment for this system can be rewarded by the gained net profit within 1.5 years.

关 键 词：磷铵尾气 节能 减排 磷酸浓缩 

分 类 号：TQ442[化学工程—化学肥料工业]