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化工学报  2014 

维生素低温蒸发结晶单元的自回热设计及分析

DOI: 10.3969/j.issn.0438-1157.2014.12.025, PP. 4831-4838

Keywords: 自回热,蒸发,结晶,节能,压缩机

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Abstract:

针对传统维生素生产过程中的蒸发结晶单元耗能高、排放量大的特点,提出了一种基于自回热原理(self-heatrecuperationtechnology,SHRT)的改进设计.利用能量分析和(火用)分析的方法对系统进行分析.并研究了最小传热温差的特性,以及压缩机的绝热效率和闪蒸进口过热度对系统能耗的影响.结果表明,利用自回热思想改进的蒸发结晶单元比传统过程所需的输入能减少了73.0%,输入(火用)减少了68.3%.在文中的条件下,潜热比显热有更大的利用空间,利用的潜热占总循环热量的93.5%.同时,最小传热温差的增大虽然会使需要的换热器的面积减小,但也会导致更大的能量输入.系统的能耗随着过热度的增大而增大,随着绝热效率的增大而减小.

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