Optimization of Chenzhuang Combined Station through Pinch Analysis

Abstract The energy flow relation in the heating and heat exchanging process in a combined station is complicated. The heat exchanging network of Chenzhuang combined station has unreasonable energy utilization. First, pinch analysis for Chenzhuang combined station is performed by selecting pinch temperature differences within a reasonable temperature range. The pinch situation and minimum heating and cooling load are determined through the problem table. Then the energy-saving potential of the heat-exchanging network, which is optimized and retrofitted, is calculated. Finally, according to the results of energy costs and heat exchanger costs, the relationship between minimum pinch temperature difference and costs is plotted, with obtaining the optimal pinch temperature difference. Hereafter, pinch analysis is performed again, and the pinch temperature and energy-saving potential are calculated under the optimal pinch temperature difference. The results show that when the temperature difference of the pinch point is 20°C, the total cost of the corresponding combined station is the lowest, and the energy-saving potential reaches 14.3%.