乙醇-水溶液连续精馏塔设计

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1、设计题目:乙醇-水溶液连续精馏塔设计设计时间：设计成绩：指导教师：审阅时间：37筛板精馏塔设计任务书一、设计名称：乙醇-水溶液连续精馏塔设计二、设计条件1．进精馏塔的料液含乙醇25%（质量），其余为水；2．产品乙醇含量不得低于94%（质量）；3．残液中乙醇含量不得高于0.1%（质量）；4．生产能力为日产94%（质量）乙醇产品（200+5*56）吨/天；5．操作条件（1）塔顶操作压力4kPa（表压）；（2）进料热状况（自选）；（3）回流比（自选）；（4）加热蒸气为低压蒸汽；（5）全塔效率60%。（6）单板压力降≤0.7kPa6．工作日：每年330天，每天24小时连续运行。三、设计要求：1．设计方

2、案的确定及流程说明；2．塔的工艺计算：（1）物料衡算；（2）计算塔顶、塔底及加料板温度；（3）计算平衡数据；（4）计算塔板数：作X-Y图；求最小回流比及适宜回流比；求理论塔板数和实际塔板数。3．塔和塔板的主要工艺尺寸计算：（1）塔体和塔板主要尺寸的确定：塔径；溢流装置（溢流堰长、出口堰高、降液管的宽度及面积、降液管下端与塔板间距离）；塔板设计（塔板布置：包括开孔区、溢流区、安定区、无效区；筛孔数或浮阀数：包括孔径、塔板厚度、开孔面积、开孔率、孔数或浮阀数、浮阀的选型；排列方式及孔心距）。（2）塔板的液体力学验算：塔板压力降；雾沫夹带；漏液点气速；液泛（即淹塔）。（3）塔板负荷性能图。4．设计结

3、果一览表371．板式塔的结构：（1）塔体结构：塔顶空间；塔底空间；人孔；视镜；支座；塔高；封头及容器法兰。（2）塔板结构及安装方式。2．附属设备的计算及选型（1）再沸器（即蒸馏釜）；（2）塔顶回流冷凝器；（3）料液预热器；（4）塔顶、塔底产品冷凝器；（5）主要接管尺寸及法兰：包括塔顶蒸气出口管、回流液管、料液排出管、加料管、饱和水蒸气管的管径及各接管的法兰。（6）蒸气喷出器。3．绘图：生产工艺流程图、精馏塔的工艺图、塔板构造图。4．对本设计的评述和有关问题的分析讨论。37目录第1章设计方案简介··················································1

4、第2章工艺流程草图及说明·········································2第3章塔板的工艺计算·············································33.1精馏塔全塔物料衡算·····················································33.2乙醇和水的物性参数计算················································33.2.1温度······················································

5、··············33.2.2密度·································································53.2.3混合液体表面张力······················································63.2.437相对挥发度·····························································73.2.5混合物黏度····························································

6、·73.3理论板数和实际板数的计算·············································83.4操作压力的计算·························································10第4章塔体的主要工艺尺寸计算······································114.1塔体的主要工艺尺寸计算···············································114.1.1塔经的初步计算·······································

7、··················114.1.2溢流装置计算························································134.1.3塔板设计·······························································154.237筛板的流体力学验算·······················