超超临界MC系统运行特性及优化研究

Research on Operation Characteristics and Optimization of MC System

MC系统利用回热式小汽轮机能够降低中间再热机组的抽汽过热度。以MC系统为研究对象,建立了主汽轮机和小汽轮机相互耦合的全工况数学模型,基于Labview开发仿真试验平台,以试验为基础提出了系统优化方法。结果表明:MC系统中回热式小汽轮机随负荷降低存在做功溢出,需通过进汽节流来实现主机与小汽轮机相互协调;背压辅助调节功率的优化方法能够有效减少回热式小汽轮机进汽节流,从而提高MC系统的经济性。

MC system can reduce the superheat of extraction in large reheat units with T-turbine,and it was analyzed in this paper.Dynamic mathematical models of main steam turbine and T-turbine were established and a simulation test platform based on Labview was built.This paper conducted some tests and proposed an optimization method of this system.The results showed that the T-turbine overloadedwhen the unit load was reduced.The inlet throttling could not be avoided.Using the backpressure to meet the power matching can reduce the throttling of the steam turbine and improve energy efficiency of MC system.