Analysis Of Thermal And Flow Field In Water-Hydrogen Cooled Turbine Generator

The energy problem is the focus of attention of international society and the lifeblood of the development of a country.China is the second largest energy consumer country of the world,energy supply affects the development of it.Although coal,petroleum and natural gas reservation in China are abundant,as a major energy consumer country,energy shortage troubles us.With the development of the national economy,demand for electricity and power grid construction scale are growing,and most of the world’s electricity generators are the turbine generator unit,which also require the motor manufacturing industry to provide more large capacity turbo generator unit.Nuclear energy as a clean energy is huge and inexhaustible,AP1000 4-pole water hydrogen cooled turbo generator as a new technology is widely used in the world.Nuclear power plant cooling has become an important research subject;due to the nuclear power capacity and loss of internal parts of unit are large.The objects of this study are stator,rotor and air gap in AP1000 water hydrogen cooled 4-pole generator which is being developed in factory,research on the steady state flow field and temperature field in the steam turbine generator.According to cooling medium flow and the ventilation cooling system characteristics of the large water-hydrogen cooled turbine generator,the threedimensional flow field model of the turbine generator is established.The flow of wind and water,distribution ratio of the fluid in each path and velocity distribution in specific conditions are analyzed and calculated;Compared with the given standard values,errors are within the allowable range.Based on the results of the turbine generator flow field calculation,the three dimensional flow field and temperature field coupling to solve the model is established.By solving the model to the calculation domain,obtained the temperature distribution ofcooling medium,and determine the highest temperature rise of the cooling medium position.According to the above calculation results,temperature distribution of the main solid motor parts are analyzed,especially copper winding,iron core,magnetic shielding,pressure plate,retaining rings,slot wedge,insulation and so on.In the end,simply compared to the calculated highest temperature and the maximum permissible temperature rise,and requirements of error is in the allowed range.The validity of the simulation results are proved.For the production design and optimization of the class of the steam turbine generator the useful data and theoretical basis are provided.