Calculation Of Intensity Of Last Blade Of Boiler Feed Pump Turbines For1000mw Ultra Super Critical Steam Turbine

With the global economic crises happened and the world entering into the low-carbonera, the market competition becomes increasingly fierce, the power manufacturing hasentered the era of slender profit, facing severe cost challenges. Many companies choose tocontrol and reduce the supplying cost ceaselessly to enhance the competitiveness of theirproducts. Currently, there are half-capacity BFPTs manufactured by Mitsubishi and Alstonand full-capacity BFPTs manufactured by Siemens for matching1000MW USC unitsabroad. Under the circumstances that the need of the market increases and the competitionbecomes increasingly fierce, to develop the competitive BFPTs is very necessary.Otherwise, last blade decides to the output and performance of the turbine. So, these aremain parameters of designing high effiency and low supplying cost turbine. To esure thesafety and reliability of last blades run, vibration characteristics of its strength mustconduct in-depth study. The research in the broader field of knowledge involved SolidMechanics, Vibration, Hydromechanics, Materials Science, Numerical methods, Finiteelement method. The variable speed BFPT is applied to the interlock blade, which high is500mm, the maxium speed is about6000rpm. That is the actual stress level rather than1mhigh blade for50Hz turbine. During the operation speed, load and back pressurefrequently change. Design and analysis of its strength are a highly challenging task.This paper mainly researches the finite element analysis of last stage blade’s strengthin the BFPTs for1000MW USC units. The interlock blade with low vibration stress, somewith connections around the low centrifugal stress, elimination of creep clamage, andelimination of corrosion pits, high efficiency, and good safety performance can greatlyincrease the efficiency. For the fixed speed turbine there are few modes in full circle andfrequency stability. In view of these advantages and low cost design the interlock blade isapplied to the BFPTs.The last blade of variable speed, variable output and variable parameter turbine is anot frequency modulation blade. Frequency changes in the speed situation leaves thestrength and stiffness evaluation is to ensure the successful development of leaves and thefirst key to safe and reliable operation. In these research using traditional strength analysissoftware PHS1516and Finite element analysis software ABAQUS analysis static stress,vibration and dynamic stress of the last blade.Finally, the two results respectively calculated by the traditional strength analysissoftware PHS1516and finite element analysis software ABAQUS are compared. The result shows that the two get roughly equal and are in compliance. Therefore, variablespeed feed pump turbine can be applied to the interlock blade.