Anti-corrosion device of temperature element of high-pressure cylinder of steam turbine

Abstract

An anti-corrosion device of a temperature element of a high-pressure cylinder of a steam turbine comprises a heat shrinkable tube; the heat shrinkable tube and the external of an armored thermocouple which is arranged on the high-pressure cylinder are glued together; the heat shrinkable tube comprises a tube body and a fixing strip; the heat shrinkable tube is usually formed by polymer materials through the radiation crosslinking treatment and expansion process; a long through opening is axially formed in the heat shrinkable tube; the inner wall of the heat shrinkable tube is matched with the outer diameter of the armored thermocouple; the heat shrinkable tube is shrunken and bundled on armored thermocouple through heating; the fixing strip and an open hot melt adhesive are glued on the external of the opening of the heat shrinkable tube; a plurality of projections are uniformly distributed on the outer wall of the heat shrinkable tube. According to the anti-corrosion device of the temperature element of the high-pressure cylinder of the steam turbine, the heat shrinkable tube sleeves the armored thermocouple to enable the heat shrinkable tube steel to be arranged at the steel armor position of the armored thermocouple to be sealed and accordingly the steel armor position of the armored thermocouple can be isolated from the corrosive gas emitted from heat insulating materials, the corrosion of the corrosive gas volatilized from the heat insulating materials on the armor position of the armored thermocouple is eliminated, and the service life of the armored thermocouple is extended, the measurement accuracy is not affected, the cost is low, and the installation, the maintenance and the replacement are easy.

Description

technical field [0001] The invention belongs to the technical field of power plant equipment application, and in particular relates to an anti-corrosion device for a high-pressure cylinder temperature element of a steam turbine. Background technique [0002] In the high-pressure cylinder of a steam turbine, due to the high steam density, small water droplets, easy acceleration, and small impact, there will be no erosion of the moving blades, but it will cause erosion of a series of stationary parts. Erosion and corrosion mainly occur on cylinders, retaining rings, steam seals and other immovable parts. Erosion and corrosion of static parts is one of the main problems of saturated steam turbines in nuclear power plants, causing a significant decline in unit reliability and economy. [0003] "Analysis of Erosion and Corrosion of 300MW Steam Turbine in Qinshan Nuclear Power Plant" analyzed the erosion phenomenon of steam turbine and steam pipeline found in routine island maint...

AI Technical Summary

Problems solved by technology

[0005] To sum up, the temperature measurement of the high-pressure cylinder of the steam turbine in the current power plant belongs to the measurement parameter of weight. At present, long armored thermocouples are mostly used for measurement. Corrosion, resulting in severe corrosion of the steel armor, resulting in corrosion of the temperature components of the high-pressure cylinder of the steam turbine, reducing the service life of the components, and failure of component measurement, thus affecting the stable operation of the unit, and the temperature components of the high-pressure cylinder of the steam turbine cannot be replaced when the steam turbine is not exposed

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