Research on the 330MW Double-Extraction Steam Turbine of Dynamic and Thermal Characteristics Analysis Model

Abstract

This paper is study on the 330MW Double-extraction unit, made by Dongfang Steam Turbine Works manufactured, and the reference conditions of the unit was calculated. Thermal system analysis and calculated of double-extraction unit based on the equivalent enthalpy drop and variable condition calculation methods, and double-extraction steam turbine dynamic characteristics analysis model is established through a series of dynamic characteristics. The result showed that the smaller error between the calculated value and the design value of this model, and it can be applied to single extraction and condensed various working conditions. In addition, four variables of the unit main steam flow, low-pressure extraction flow, medium pressure extraction flow and electric power was fitted, resulting in multi-characteristic equation, which provides a theoretical basis for the follow-up study online load distribution.