The paper shows the establishment of mathematical model of cartridge-type sequence valve and the simulation analysis made during the valve inlet pressure recovery under the condition that the load of the valve at outlet lost suddenly.

In this paper,two control mode of steam turbine in part load condition is introduced firstly,then the existing problems of the single valve control mode and the sequence valve control mode is analyzed.

Analysis of high temperature of bearing liners for 600 MW steam turbines in sequence valve operation modes;

Analysis of sequence valve control mode of 600MW supercritical steam turbine

It is described that the two 600MW turbine units could not be switched to sequence valve control mode and had been always running at single valve mode because of the problems of the turbine structure,installation and operation,and therefore,the efficiency of the units was at depressed level.

The load perturbation of both of the turbines is large during the course of switch between single valve and sequencing valve,which had passive influence on the safe operation of units.

This paper introduces the anomalous phenomenon that occured after adopting sequencing valve steam distribntion mode instead of single valve mode,and based on the analysis,puts forward a appropriate solution.

The anomalous phenomenon occurred after adopting sequencing valve steam distribution mode instead of single valve mode in 2×600 MW supercritical turbine of Guohua Taicang Power Generation Co.