Analysis Of Long-distance Pipelines Coupling Power Generation System Option And Hydraulic Turbine Transition Process

Hydropower is one of the more mature power sources available at presentboth in terms of technology and economics. Also, it is globally acknowledged tobe a clean energy. The turbine is a type of prime mover which transfershydropower contained within a flow into rotational mechanical energy. Whenwater flows through a turbine it transfers the rotational mechanical energy intoelectrical energy;it does this by driving the main shaft in the electric generator.When water in a long distance pipeline passes by a pressure reducing valve,throttling will cause a loss of much energy.Long-term effects on the valve bodywill produce a series of problems. These problems can include: cavitations,erosion wear, noise and vibration. To prevent these problems a hydroelectricgenerating unit can be used instead of pressure relief valves, thus some of theenergy in the flow can be converted to electric power (this energy would currentlybe going to waste). In addition, the pressure requirements for the tail water after aturbine do not affect the water supply system’s inlet hydraulic head, and the flowrate through turbine does not impact upon the requirements of the water supplysystem.This thesis is about a long distance pipeline system in Shuangyashan,Heilongjiang province. In particular, it investigates the feasibility of installing acoupled hydropower system on this pipeline. The premise of this water supplysystem is to transfer the hydropower lost in the pressure reducing valve intoelectric power. If this is achieved then it will have a win-win effect. The challengeis to determine the position of the turbine. This thesis refers to a long distancepipeline system for which hydraulic simulation data already exists. This data willbe used to determine the best position for the turbine and the appropriate turbinetype. The best turbine will be selected based on theory and established designprinciples for hydropower stations and turbines. Experiments are then conductedto test these theories.Finally, it is necessary to ensure the security of the system. In this thesis, thewater hammer pressure and rotating speed are calculated to understand thetradeoffs between them. This is done to ensure water hammer pressure does not become too high (which will harm the pipeline and turbine spiral case).Adjustment is required to ensure that the calculated unit speed is maximized toensure that the security and stability of the coupled system is within the allowedspecifications. The analysis’ results give support to the construction of thehydropower plant. Finally the methodology and results within this thesis canplay a guiding role in similar projects in the future.