![]() ![]() Pinch analysis as an energy integration technique is proven to save more energy and utility cost than the traditional energy technique currently being used in the unit. The percentage energy savings reported is as a result of the re-use of the cold or hot process streams before being sent back to the power plant or the trim coolers. The Pinch point temperature was found to be 544☌, with the utility targets for the minimum approach temperature being 7491.9 kW and 8259.62 kW for hot and cold utilities respectively, leading to energy savings of 34.33% and 32.17%. This was achieved via the development of composite and grand composite curves for the kero hydrotreating unit process. ![]() Application of Pinch technology to kero hydrotreating unit heat exchanger network is presented with an optimum minimum approach temperature of 2.5☌ to determine the energy target. This has necessitated the investigation into analysis of the current energy configuration to curb this menace and to proffer solution which would lead to efficient utilization of energy. Kero hydrotreating unit being an integral part of the refinery system has been characterized by heat leaks, heat losses and inefficiencies in the heat transfer processes. _ Keywords: heat exchanger network, crude distillation unit, pinch analysis Hence the heat exchangers in the crude distillation unit need to be retrofitted to ensure adequate heat recovery, process to process integration and efficient energy utilization within the network. The analysis indicated that a total of 98916.1 KW hot utility, 8298.7 KW cold utility were not utilized within the network (poor process stream matching) and that ten heat exchangers were not properly placed. From these, the minimum heating and cooling requirements of the entire network, the process streams not properly matched and the heat exchangers not properly placed were obtained. The software produced the composite and grand composite curves, the grid representation and target reports. Process data of the heat exchanger networks (HEN) were collected to formulate a problem table and used in Aspen-Pinch ® software for pinch analysis of the networks. This analysis is aimed at ascertaining the energy efficiency and operation of the heat exchangers used in preheating the crude. The pinch analysis of the heat exchanger networks in the crude distillation unit of the New Port-Harcourt refinery has been performed. ![]()
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