Research On Micro Steam Turbine Of Low Parameters For Rolling Kitchen

This dissertation focuses on the design and investigation of a radial inflow micro stream turbine operated in low parameters. This apparatus is used to convert the remaining stream of low-level thermal energy produced in the rolling kitchen into electrical energy, hence boosting the energy efficiency of the system and attaining the purpose of energy savings.During the calculations of thermodynamics and pneumatics parameters of the micro stream turbine, the pressure of the outlet is set at 0.11MPa and the temperature of the stream is set at 105℃. As the relatively low-temperature stream is easy to be congealed and a huge thermal energy is given out in this process, the energy efficiency of the rolling kitchen is enhanced and the amount of stream used is lessened.A program based on vb is developed to calculate the thermodynamics and pneumatics parameters of the micro stream turbine. Based on the program, the structure of the turbine is optimized. Finally the optimal thermodynamics and pneumatics parameters are obtained.The stress distribution of the impeller is represented with the method of twice calculation in this paper and accordingly the strength of impeller is checked.Formulas of max stress resulted from centrifugal force and aerodynamic force are derived, and finally the strength of blade is checked.In the designing of the sealing structure for the micro stream turbine,we combine a radial inflow labyrinth and a segmental type graphite sealing ring together. This type of sealing simplifies the inner structure of the micro steam turbine, decreases its weight and acquires a proper sealing effect.