Two-cylinder Two-speed Steam Turbine Used In Gas-steam Combined Cycle Project

With the development of the 100/150MW combined cycle project in China,the market of steam turbine which applied in the project is growing fast.The domestic steam turbine in the capacity grade has advantage of cost performance and service even can compete with the international manufacturers in many markets.Due to the high price of gas,efficiency of the combined cycle steam turbine is the most important focus point to the market.Therefore,research on steam turbines which applied in combined cycle project in this grade has become increasingly urgent,and improving efficiency and meet the special requirements of the projects is an important research direction for the combined cycle steam turbines.The study is to improve the efficiency of steam turbine in the combined cycle projects.Under the premise of ensuring the safety of the steam turbine,full-cycle steam inlet and two-cylinder two-speed design is proposed.The thermal design of the two-cylinder two-speed steam turbine is made in the combined cycle project with GE 6F.03 gas turbine,and the advantage of cost performance compared with the traditional single-cylinder steam turbine is analyzed.Meanwile,the characteristics of turbine vibration and rapid start-up are verified.Also it is discussed whether the two-cylinder two-speed steam turbine is equipped with a reheating system by using the calculation software,design guidelines of Siemens industrial steam turbine technology,SolidWorks and ANSYS.The study inproves the two-cylinder two-speed steam turbine has advantages in efficiency and power boosting,and verifies that the two-cylinder two-speed scheme is reasonable and feasible,and further demonstrates the two-cylinder two-speed turbine has certain advantages in setting up reheat in the combined cycle project with 6F.03 gas turbine.The application of the two-cylinder two-speed steam turbine in the combined cycle project with specific capacity and specific gas turbine is verified,and the efficiency and power improvement are achieved under the premise of ensuring the safety and stability of the steam turbine.