Pinch Technology Applications In Thermal Power Plant For The Heat Exchange Network Optimize

Based on the pinch technology, this thesis performs a study on and calculation of theHeat Exchanger Network of the thermal power station. When taking the mathematicalprogramming approaches, the deviation from the practical situation normally becomesincreasingly significant with a growing number of assumed factors, which leads to aconsiderable gap between the result and the actual network energy efficiency. However, thepinch technology proves to be a workaround.This thesis explains the optimization rules of the Heat Exchanger Network whileintroducing the pinch technology optimization process. Three fundamental laws must beobeyed at the pinch point: no heat transfer is allowed at the pinch point; no cooling utilitiesare allowed above the pinch point; and no heating utilities are allowed below the pinch point.When refining the pinch technology to avoid heat transfer at the pinch point, we must complywith the rules of Heat Capacity Rate and numbers of streams: the total number of cold streamsbelow the pinch point NCis no more than the total number of hot streams NH, and the HeatCapacity Rate PCpcof the cold streams is no more than the Heat Capacity Rate PCphof thehot streams; Similarly, the total number of hot streams above the pinch point NHis no morethan the total number of cold streams NC, and the Heat Capacity Rate PCphof the hot streamsis no more than the Heat Capacity Rate PCpcof the cold streams. Any non-compliancerequires a bypass flow to fix. In addition, the compliance with the rule of maximum heat loadis required, where either one of the two streams needs to be completely exchanged in eachmatching.This thesis identifies the fundamental principles and pitfalls in the pinch pointtechnology design, analyzes the original Heat Exchanger Network, finds the pinch pointthereof, locates the heat exchanger and utilities across the pinch point, and finally presents theoptimization proposal. A decreased total heat exchange area and utilities project cost becomepossible as a result of the calculation performed against the practical data of the thermalpower station.