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Energy Optimization of Light Naphtha Isomerization Unit at PGSOC1 Using by Pinch Analysis

Hajghani Somayeh, Mozdianfard Mohammad Reza

Energy efficiency is improved by Heat Exchanger Network (HEN) and Pinch Analysis (PA). In this research, the retrofitting of HEN of Light Naphtha Isomerization (LNI) was carried out to decrease the utility consumption and cost using by PA. Data extraction was needed to calculate the hot and cold utility consumption in target and actual by Aspen Energy Analyzer (AEA) to indicate the Composite Curve (CC) and Grand Composite Curve (GCC). The base case shows that at Δ𝑇𝑚𝑖𝑛 = 10˚C that has the minimum total cast, the approach pinch was 92-102˚C. Also, an energy pocket on GCC existed between 140 to 170˚C, and the target can be optimized up to 19.17%. Five retrofitting cases were carried out on HEN of LNI to approach the target of utility consumption. The results indicated that, the hot and cold utility consumption 2.78 e7 Kj and 5.08 e7 Kj decreased, respectively. Also by retrofitted on a base case the utility consumption and total cost decreases by 11.3% and 3.7%, in order.