基于平均传热温差的炼化企业换热网络设计

Design of heat-exchange network based on average heat-transfer temperature difference

传统夹点法设计的换热网络没有考虑热量在运输和换热过程中的耗散。结合炼化企业生产现场的特点,为了设计出符合实际能量目标需求的换热网络,将物流间匹配换热的平均传热温差按照两侧物流传热膜系数的比率分配为冷、热物流的温差贡献值之和,以此确定各物流的温差贡献值。将采用温差贡献值法获得的结果与原案例结果进行比较,结果表明,根据物流传热膜系数的比率确定各物流温差贡献值的方法是有效实用的。

The heat dissipation of the transport and heat transfer process is not considered in traditional pinch technology. In order to design a heat-exchange network to meet with the practical energy demand, the temperature difference （△T） contribution of different （heat and cold） streams is determined by distributing the average heat-transfer temperature difference into △T contribution according to the heat transfer film coefficient ratio of the streams on both sides. The result obtained from the △T contribution method is also compared with the original one. The result shows that the determination method based on the △T contribution through the heat transfer film coefficient ratio of different streams is effective and practical.