Coal-fired boilers are mainly operated at either subcritical or supercritical conditions. From a thermo-physics perspective two phase mixtures of water and steam are replaced by a single supercritical fluid when the boiler pressure increases above the critical pressure of 22.12 MPa and the corresponding saturation temperature of 374 °C (Shen and Cheng 2004).
Entropy tested the exhaust gases from the Unit 1 coal-fired boiler. The furnace burns bituminous coal. Gases from the combustion furnace pass through two electrostatic precipitators (ESPs) to control particulate. Gases exiting the ESPs pass through a flue gas desulfurization unit (FGD) to remove SO2 and are then exhausted through a stack.
The requirements of boiler control include rapid adjustment of the boilers heat release rate to meet the dispatch demand; suppression of combustion side effects triggered by coal quality and consumption; parameter adjustments such as fuel flow and forced and induced draft air to coordinate the control system and guarantee the economic ...
Aug 05 2015 · Generally coal fired plants are considered safer than nuclear power plants. A coal power plant's failure is certainly not likely to cause catastrophic events such as a nuclear meltdown would.
There are three temperature regimes where fire-side corrosion occurs: Less than 300 o F. Dew-point corrosion occurs when sulfuric acid condenses. 500 o-750 o F. Waterwall-tube corrosion occurs in coal-fired units by the formation of pyrosulfates of sodium and potassium. In refuse-fired boilers mixtures of chlorides of zinc lead iron and sodium are the likely causes of corrosion.