Pinch design method for heat exchanger networks based on the uniformity principle of temperature difference field

Traditional pinch design method of heat exchanger networks is improved, the composite curve is divided into several segments for individual treatment, the network of every segment using the uniformity factor of temperature difference of heat exchanger networks as the evaluation index is designed, the structures of every segment and the matches far form the pinch are combined into an integrated original heat exchanger network, the original structure using Newton method as regulation optimization is optimized, and an optimal cost heat exchange network finally is obtained. From a specific example, the heat exchanger network designed according to the uniformity principle of temperature difference field is of better heat transfer performance, the final annual cost is better than that of other literature, and the availability of this method is validated.