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Safe, reliable operation of large steam raising and power generating plants depends upon the establishment of chemical conditions throughout the steam-water circuit that minimize the corrosion of system components and suppress the formation of deposits.
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A steam turbine produces shaft power by means of an enthalpy drop of steam. A special feature of steam turbines is their ability for very high power, due to the big enthalpy drop realisable per steam mass unit. Supply conditions in modern coal-fired electric power stations come to about 250 bar (25 MPa), 565 °C (supercritical).
In order to do this, steam systems consist of four main parts. Fuel System – provides chemical energy to the boiler (or combustion turbine if a heat recovery steam generator (HRSG) is used). Boiler – converts the fuel’s chemical energy to thermal energy. Distribution – conveys steam to the point of use.
Jan 1, 2006 · PDF | The local chemical environment in steam turbines is governed by the solubility and the volatility of substances in the steam. Both are influenced... | Find, read and cite all the...
Using the wrong materials in a steam plant can increase the potential for corrosion, scaling, and deposition. For example, water and steam chemistry control is much simpler and more efficient when copper alloys are avoided throughout the cycle. Control Of copper-alloy corrosion requires boiler, feedwater, and condensate treat- ment chemicals.
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• Very high steam pressures and temperatures can be achieved which is advantageous for processes such as power generation. • Steam can be readily distributed and easily controlled. • Heat may be extracted in a cascade of processes. •
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Steam power plants rely on high pressure steam to generate electrical energy. Steam power plant uses a variety of fuels, especially coal while fuel oil used for startup.
