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为降低能耗,提高装置的热回收率,1981年采用清华大学提出的“换热网络优化综合”的设计方法,对本厂北常减压装置换热流程进行了改造。一、改造内容调整减压塔中段回流的取热比例,将一中、二中抽出板位置各降低4层,以提高其温位,有利于换热;修改换热流程,由36台换热器改为48台;余热利用,即用常三、减一、减三线油预热空气至200℃,供加热炉用风;用减顶的低温热源预热新鲜水,供水处理用。改后流程结构紧凑,布局合理,通过最
In order to reduce energy consumption and increase the heat recovery rate of the device, the design method of “Heat Exchange Network Optimization Synthesis” proposed by Tsinghua University was adopted in 1981 to transform the heat exchange process of the atmospheric and vacuum distillation unit of the plant in North China. First, the contents of the transformation to adjust the middle section of the decompression column to take back the proportion of heating, will be one, two in the board to reduce the location of four layers to increase its temperature, is conducive to heat transfer; modify the heat exchange process, from 36 heat exchange Change to 48 units; the use of waste heat, that is, often three, minus one, minus three oil preheat the air to 200 ℃, for the heating furnace wind; with a reduced heat source of low temperature preheating fresh water for water treatment. After the change process compact structure, reasonable layout, through the most