Test Research On Reformation Of Capacity Expansion Of 300MW Turbogenerator

With the enlargement of economic scale and the rapid development of urbanization, China’s energy consumption showed a rising trend so that the contradiction between supply and demand of energy has become increasingly prominent, and the ecological environment pressure increases day by day. Thus saving energy and reducing consumption become the urgent task in the current economic development.Coal- fired power generation companies want to stay ahead in the increasingly fierce competition of power market, we need to objectively analyze energy consumption source in power plants system. After that, we apply modern advanced technology on main and auxiliary engines for energy-saving and consumption-reducing modification, like mix cheap fuel coal and high quality coal. O n the other hand, to enhance the unit output, greatly reduce the power supply coal consumption of steam turbine generator unit, reduce production cost, and improve the economic benefit, transforming the capacity of existing power generating sets is one of the important means. Therefore, for improving the unit efficiency and competitiveness, Zhanjiang power plant took the capacity expansion and renovation of 300 MW steam turbine and generator so that the rated load capacity of steam turbine generator grew from 300 MW to 330 MW.Through calculating the temperature rise of the steam turbine generator parts, this paper analyzes the status of stator insulation, end fixed and ventilation cooling to research the capacity expansion transformation feasibility on related auxiliar y equipment of steam turbine generator. Meanwhile, we refer to the home and abroad successful experiences then put forward the main technical technology and construction scheme. After measuring and modal analyzing the stator core loss and temperature rise before and after the modification, the natural frequency of stator winding end and the cold water flow in the stator line bar, together with the leading phase operation performance test of the generator set, we research the effect of generator capacity expansion. The experimental study shows that the generator output increases from 300 to 330 MW in maintaining the original machine rated power factor, rated hydrogen pressure and hydrogen cooler water temperature.The operating experience of two years shows that during multiple participating in grid system peak- load regulation, the load fluctuation is bigger, but the rise of temperature of the steam turbine generator parts are within the allowing scope and the unit have not any fault or abnormal situation, so it fully conforms to the requirements of power grid peak- load regulation. In a word it proves that the retrofit schemes in this paper are feasible and have a certain guidance and reference for the generator capacity expansion transformation on similar units.