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A Method for Reducing Solid Particle Erosion of Supercritical Steam Turbine

A technology for solid particles and steam turbines, applied in the directions of solid separation, cleaning methods and appliances, chemical instruments and methods, etc., can solve the problems of reducing the operating safety and economy of the unit, shortening the operating life of the unit, and falling off metal oxides. Improve safety and economy, simple structure, and the effect of promoting shedding

Active Publication Date: 2021-03-26
ELECTRIC POWER SCI RES INST OF GUIZHOU POWER GRID CO LTD
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  • Abstract
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  • Claims
  • Application Information

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

Method used

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  • A Method for Reducing Solid Particle Erosion of Supercritical Steam Turbine

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Embodiment 1

[0026] Embodiment 1: as Figure 1-Figure 4 Shown, a kind of method for reducing supercritical steam turbine solid particle erosion, this method comprises the following steps:

[0027] (1) During the start-up process of the unit with sliding parameters, the boiler evaporation is controlled to be 10% of the maximum continuous evaporation (MCR), the steam pressure is maintained at 2.5MPa, and the steam has a superheat of not less than 50°C;

[0028] (2) Close the high and medium pressure main steam valves and high and medium pressure regulating steam valves of the steam turbine, open the high pressure bypass valve and low pressure bypass valve of the steam turbine at the set opening, and ensure that the steam pressure in front of the turbine is maintained at 2.5MPa;

[0029] (3) Under this working condition, the steam pipeline of the supercritical boiler is purged under pressure to promote the falling off of the metal oxide attached to the inner wall of the tube bundle on the hea...

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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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B08B9/032B07B1/04B07B1/46F01D25/00
CPCB07B1/04B07B1/46B07B2230/01B08B9/0321F01D25/002
Inventor 王文强邓彤天冉景川兰中秋张世海徐章福
Owner ELECTRIC POWER SCI RES INST OF GUIZHOU POWER GRID CO LTD
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