By Heinz Termuehlen
The USA continues to be seriously reliant on coal for a lot of its electrical energy new release, yet is essentially utilizing superseded vegetation which are inefficient and soiled in comparison to the probabilities supplied via contemporary advances
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Extra resources for Clean and efficient coal-fired power plants : development toward advanced technologies
Using a fine grinding coal supply system also reduces the formation of thermal NOX emissions. Controlling the air and fuel supply to each burner and an optimal furnace-related evaporator design are additional methods applied to also minimize thermal NOX formation. 5 lb/MWh (3400 mg/kWh) with the listed applied primary measures. The installation of a selective catalytic reduction (SCR) system as secondary measure reduces the NOX emission more significantly. 64 lb/MWh (290 mg/kWh). The flue gas leaving the SCR enters the recuperative air heater to be cooled down by preheating the air before entering the furnace.
The proper selection of component materials, as well as the proper combination of materials not only for the entire steam turbine, but also for the steam generator and piping, is of utmost importance to achieve optimal performance, reliability, and longevity of advanced steam power plants. The currently available materials are listed in Figure 1-18 as they can be selected for components of advanced pulverized-coal–fired power plants with the listed achievable main and reheat steam parameter. Selection of the most advanced material, namely nickel alloys for high-temperature components, can lead to a power plant net efficiency of more than 471/2%.
The flue gases are reheated before being discharged through the stack. This compactly arranged 1500-MW pulverized-coal–fired power plant covers an area of approximately 360 ft by 660 ft (110 m by 200 m). This does not include auxiliary buildings, like the cooling water pump station, water demineralization plant, administration building, etc. However, building a 2-unit power plant required only one of such auxiliary facilities to be built. An example of a unit with cooling towers is shown in Figure 2-7.
Clean and efficient coal-fired power plants : development toward advanced technologies by Heinz Termuehlen