Vliv kombinovaného kyslíkového režimu na užitné vlastnosti konstrukčních materiálů tlakového okruhu klasické elektrárny

Abstract

Heating plants, heat and power plants and steam turbine power plants’ steam line systems are conceived in the way that feed-water (the mixture of water and condensate) is transported by feed pumps through a hot-water apparatus (economizer) to the boiler part of a steam-boiler. There is an intensive corrosion upon improper function of feed-water degasification in the hot-water apparatus. We are very often witnesses of a quick production of porous iron sediments or an intensive corrosion in the boiler part of the boiler, where happens an intensive evaporation. The production block which is run in a combined oxygen water regime has heat transfer surfaces which are provided with a resistant protective layer. The environment effects evaluation of construction materials of a compressive circuit damaging is commonly realize with the use of inspectional non-destructive as well as destructive technology. So far realized analyses results are indicating that the ammoniac reducing regime (VAT) does not exceed the data found out for the oxygen regime (COT). For power plants working in the oxygen water regime was found out, on the basis of so far gained data, that there will be necessary to recommend the change of contemporary regulations of conveying the oxygen regime. The change should consist of the oxygen dosing regulation in dependence on the operating mode / boiler output. This way, it would be possible to use more widely the advantages of oxygen regime, mainly for the heat transfer surfaces which are in a contact with the liquid circuit environment, with the contemporary minimization of the excessive oxygen intrusion effect to steam phase and its negative action mainly on the heat transfer surfaces from corrosion-proof steel. Long-term effect of oxygenated water regime on construction materials was tested on cuts of tubes taken from power plants.