Method for reducing solid particle erosion to supercritical steam turbine

Abstract

The invention discloses a method for reducing solid particle erosion to a supercritical steam turbine. The method comprises the following steps: 1) controlling the evaporation capacity, steam pressureand steam temperature of a boiler; 2) closing high and medium pressure main steam valves and regulating steam valves of the steam turbine, and opening a high pressure by-pass valve and a low pressureby-pass valve; 3) increasing the purge flow; 4) reducing the purge flow; 5) increasing the purge flow; 6) repeating the steps (1) and (5); and (7) collecting solid particulates. The method for reducing solid particle erosion to the supercritical steam turbine has the benefits as follows: by repeatedly changing the opening degree of the by-pass valves, the repeated changing of the purge steam pressure and flow is realized, the falling off of metallic oxides on the inner wall of the boiler tube is facilitated, the purging effect is ensured, the falling metallic oxides is blown into a condenserhot well through the steam turbine bypasses and collected and removed through a solid particle collecting device arranged in the hot well, solid particles generated are removed in time during the start-up phase of the turbine unit, the damage to the blade profile is avoided, the operation safety and economic efficiency of the turbine unit are improved, and the service life of the turbine unit is prolonged.

Description

technical field [0001] The invention relates to a method for reducing the erosion of solid particles of a supercritical steam turbine, and belongs to the technical field of reducing the erosion of solid particles in the passage part of a super (super) critical steam turbine. Background technique [0002] Ultra (super) critical steam turbine generator set, because it is in a super (super) critical state and operates under variable working conditions, it is easy to cause the formation and shedding of metal oxides on the inner wall of the boiler furnace tube. If the shed solid particles enter with the steam flow at high speed The flow part of the steam turbine will cause serious solid particle erosion to the blades of the regulating stage of the steam turbine and the first stage of the intermediate pressure cylinder, which is called SPE (Solid Particle Erosion), destroying the blade shape, reducing the operating safety and economy of the unit, and shortening the operating life o...

AI Technical Summary

Problems solved by technology

[0002] Ultra (super) critical steam turbine generator set, because it is in a super (super) critical state and operates under variable working conditions, it is easy to cause the formation and shedding of metal oxides on the inner wall of the boiler furnace tube. If the shed solid particles enter with the steam flow at high speed The flow part of the steam turbine will cause serious solid particle erosion to the blades of the regulating stage of the steam turbine and the first stage of the intermediate pressure cylinder, which is called SPE (Solid Particle Erosion), destroying the blade shape, reducing the operating safety and economy of the unit, and shortening the operating life of the unit

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