参考资料--kta粒状磷酸一铵干燥工段工艺设计.docVIP

120kt/a粒状MAP干燥工段工艺设计 学 生学 号专 业 120kt/a粒状MAP干燥工段工艺设计 摘 要 磷酸一铵是高浓度磷复肥的主要品种之一也是生产三元复混肥、BB肥最主要的基础原料磷酸一铵磷酸一铵 The process design for 120kt/a granular MAP of drying section Abstract MAP is a main varieties of high-concentration phosphate compound fertilizer and is the basic procreative material of ternary Compound Fertilizer and BB Fertilizer. Our MAP process mainly include slurry method and concentrated acid method, due to the lack of high quality phosphorate in China, and comparing the two method shows slurry method is more suitable for Chinas national conditions. At present, the drying process production has spraying granulation processes and the spray-drying process. In this paper, spraying granulation technology is used to produce MAP. Firstly, we introduced the principle of granular ammonium phosphate and spray drying granulation, and operating conditions were determined to get the main physical parameters; Secondly, according to property parameters of the material, the heat and mass conservation was carried out to determine the main equipment; Finally, base on the main device valuation results, the ancillary equipments were selected, and provided the main equipment and controlling process flow charts. The main task of this design is the spray granulation equipment design, the selected process and device can complete the given task. Keywords: monoammonium phosphate(MAP), spray granulation, dry 目 录 1 绪论 1 1.1 前言 1 1.2 湿法磷酸氨化反应的基本原理 1 2 文献综述及主要工作 2 2.1国内外生产技术概况 2 1.3.1 传统法 2 1.3.2 料浆法 3 2.2干燥工艺 5 2.2.1干燥概述 5 2.2.2滚筒干燥 5 2.2.3喷雾干燥 6 2.2.4喷浆造粒干燥 6 2.2.5转筒干燥制粒状磷铵 6 2.3本研究工作意义和主要工作 7 2.3.1工作意义 7 2.3.2主要工作 7 3 工艺选择与论证 9 3.1喷浆造粒干燥机成粒机理 9 3.2粒状磷铵的干燥原理 9 3.2.1湿气体性质 9 3.2.2湿物料的性质 12 3.3干燥速率及其影响 13 3.4干燥器的物料和热量衡算 14 3.4.1物料衡算 14 3.4.2热量衡算 15 3.4.3气体进出干燥器状态的确定 17 3.4.4干燥器的热效率与干燥效率 17 3.5喷浆造粒干燥操作条件的选择 18 3.5.1干燥机的进口温度 18 3.5.2干燥机的尾风温度 18 3.5.3浓缩料浆含水率 18 3.5.4干燥机填充系数 19 3.5.5料浆中和度 19 3.5.6料浆温度 19 4 干燥机的设计 21 4.1干燥机