Type Selection And Analysis Of Flow Field Of The Remaining Energy Recovery Hydraulic Turbine Performance

This paper get support the National Natural Science Foundation of China,"the multi-stage hydraulic turbine flow channel optimization and design theory(51579104)" and the post-doctoral research project of Jiangsu Province "The new ultra-low ratio oblique flow turbine of the theory and technology(1402099C)" to complete.Saving energy is a basic national policy,and improving energy efficiency is one of the important measures of energy conservation.In the petrochemical industry,oil processing(oil hydrocracking,residue hydrodesulfurization),chemical fertilizers,desalination,iron and steel metallurgy and other industries have a large number of high-pressure liquid,These high-pressure liquids tend to reduce the high pressure to the desired low pressure through the relief valve or orifice plate.The energy of the high-pressure liquid is wasted.For that,the study of hydraulic turbines in order to take advantage of this part of the high pressure,to improve energy efficiency,thereby reducing the energy consumption of enterprises,improving the competitiveness of enterprises.Based on the same axial dimension,the corresponding typical single stage hydraulic turbine was designed according to the three design methods of conventional turbine,super-low specific speed turbine and water pump turbine.The effects of three kinds of single-stage turbines on the level utilization,over-current capability and optimal working condition are studied,which can support the study of multi-stage hydraulic turbine.Taking the PROE software as a tool,three kinds of single-stage hydraulic turbines were modeled in three dimensions to generate the model.The CFD numerical simulation method was used to simulate the three kinds of hydraulic turbines at different flow rates(0.8Qr,0.9Qr,Qr,1.1Qr and 1.2Qr),the external characteristics of Q-η,Q-H,Q-P and the energy loss of each part are analyzed,and the pressure distribution and flow distribution of the internal flow field are analyzed.The energy indexes of three typical hydraulic turbines are studied,and the optimal energy,the overcurrent capacity and the optimal efficiency are obtained.Based on the CFD analysis,the single-stage energy level utilization capability of three typical hydraulic turbines is obtained: the lowest level of water pump is suitable for energy recovery with low industrial pressure,and the level of conventional turbine is higher Residual pressure medium energy recovery;super-low speed turbine level of the highest level for industrial pressure for high pressure or high pressure energy recovery.Based on the CFD analysis,the overcurrent capacity of the three typical hydraulic turbines is studied.The overcurrent capacity of the optimal working condition of the super-low specific speed turbine is the largest,and the overcurrent capacity of the optimal working condition of the pump minimum,conventional turbine optimal operating conditions over the flow between them.Based on the CFD analysis,the single stage hydraulic efficiency of three typical hydraulic turbines is studied.The optimal working condition of the super-low specific speed turbine is the lowest,the optimal working condition of the pump turbine is higher,the optimal working condition of the conventional turbine is the highest.