ENERGY SAVING OF NAPHTHA HYDROTREATING (NHU) PLANT USING HEAT INTEGRATION

ABSTRACT

Energy is fundamental necessary for any industrial economy, yet it is often overlooked in the drive for profitability. Recent energy market development, including deregulation, increasing oil and gas prices as well as effect of combustion gas on the environment has created a new emphasis on energy management. Pinch technology is a vital tool to achieve this objective. Therefore, energy Integration of Naphtha Hydrotreating Unit (NHU) of Kaduna Refinery and Petrochemicals Company was carried out using Pinch Technology. Optimum minimum approach temperature of 10^oC was obtained. The pinch point was found to be 488 K. The utility and capital cost for optimum MTA of 10^oC are $2.80664 x 10⁶ and $1.2798 x 10⁶ respectively.  The cold utility requirements of traditional energy approach and pinch analysis of HDS obtained are 22,492.4 kW and 15,408.4 kW respectively while the hot utility requirements of traditional energy approach and pinch analysis are 24,516.0 kW and 18,246.1 kW respectively resulting in energy saving of 28.5% of total energy. Pinch analysis as an energy integration technique saves more energy and utilities cost than the traditional energy technique.