职业技术学院毕业论文（设计）(冶金化工系)题目水溶液全循环法生产尿素工艺专业应用化工技术班级姓名学号指导教师完成日期2010年6月25日-2010年10月10日目录摘要...............................................................1第一章概述.........................................................21.1尿素的物理化学性质和用途......................................21.1.1尿素的物理性质.............................................21.1.2尿素的化学性质.............................................21.1.3尿素的用途.................................................21.2尿素的生产方法简介............................................31.2.1水溶液全循环法.............................................41.2.2汽提法.....................................................41.3水溶液全循环法和CO2汽提法两种方法的比较.......................41.3.1水溶液全循环尿素工艺的优、缺点.............................51.3.2C02汽提法尿素工艺的优、缺点...............................61.3.3尿素的发展前景与展望.......................................6第二章水溶液全循环法生产尿素的原理.................................92.1化学反应......................................................92.2反应原理......................................................9第三章水溶液全循环法的生产工艺流程................................113.1原料的准备...................................................113.1.1氨........................................................113.1.2二氧化碳..................................................113.2尿素的工艺流程图.............................................113.3原料的净化与输送.............................................133.3.1二氧化碳脱硫与压缩原理....................................133.3.2液氨的净化与输送..........................................133.4尿素的合成...................................................143.4.1液氨和二氧化碳直接合成尿素................................143.4.2合成尿素的理论基础........................................143.5中压分解与吸收...............................................143.6低压分解与吸收...............................................153.7尿素溶液的蒸发与造粒.........................................15第四章物料衡算和热量衡算..........................................164.1物料衡算.....................................................164.1.1数据采集..................................................164.1.2基本物料衡算..............................................164.2热量衡算.....................................................174.2.1数据采集..................................................174.2.2基本热量衡算..............................................18第五章生产尿素的工艺条件及主要设备................................195.1生产尿素的工艺条件...........................................195.1.1温度......................................................195.1.2氨碳比....................................................205.1.3水碳比....................................................205.1.4操作压力..................................................205.1.5反应时间..................................................215.2生产尿素的主要设备...........................................215.2.1脱硫塔....................................................215.2.2合成塔....................................................215.2.3高压混合塔................................................235.2.4中压分解加热塔...............
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