Published on March 10, 2014
Coal-Fired Power Plants: Coal-Fired Power Plants Presented By: Kristin Scheel Alejandra Kuhn Brianna Beconovich Ryan Nester Types of Coal: Types of Coal Fossil fuel It is a readily combustible black or brownish-black sedimentary rock Coal Mining: Coal Mining Surface Mining Strip Mining Underground Mining Coal Power Plant Operation: Coal Power Plant Operation Feedwater Feedwater used in a steam boiler to transfer heat energy from the fuel burning area to mech. Energy of spinning steam turbine Boiler Rectangular furnace, pulverized coal is blown in from fuel nozzles at 4 corners. The coal then burns quickly and forms a fireball at the center (seriously, a fireball!!!). Coal Power Plant Operation: Coal Power Plant Operation Steam Turbine Generator Is a series of steam turbines interconnected to each other and then a generator Steam Condenser Steam enters f rom the turbine generator and is pumped into the bottom of the condenser, where pumps recycle the condensed steam from the feedwater Stack Releases process emissions. Coal Power Plant Operation: Coal Power Plant Operation Pros of Coal Power: Pros of Coal Power Cheap Cheaper per unit energy than oil or natural gas Will continue to be an important global resource Abundance Coal is the world’s most abundant fossil fuel Sufficient reserves for the next 250 years : Pros of Coal Power: Pros of Coal Power Electricity Supplying approximately 50% of electricity to the US Economy Coal-mining stimulates over one million jobs in the U.S. Coal contributes over $80 billion annually to the economy Pros of Coal Power: Pros of Coal Power Efficiency Larger power plants are more efficient 38% of the chemical energy is converted to energy Safe safest fossil fuel to transport, store and use scrubbers Cons of Coal Power: Cons of Coal Power Coal-Fired Power Plants are the largest contributor of hazardous air pollutants. Sulfur dioxide (SO 2 ) Nitrogen Oxide (NO x ) Carbon Dioxide (CO 2 ) Mercury Effects on the environment and Human health: Effects on the environment and Human health CO 2 ~ carbon dioxide pollution, making energy use the single largest source of greenhouse gases in the U.S. and the world Effects on the environment and Human health : Effects on the environment and Human health SO 2 S ulfur dioxide combined with nitrogen oxide react with water and oxygen in the atmosphere to form acidic compounds, which can mix with natural precipitation and fall to the earth as acid rain . Sulfur dioxide can also combine with nitrogen oxide and other particles to form particulate matter . trigger heart attacks and strokes lead to cardiac arrhythmia (irregular heartbeat) respiratory irritation, and worsen asthma. premature death (Both short-term and long-term exposure) Effects on the environment and Human health : Effects on the environment and Human health NO x When nitrogen oxide (chemically) reacts with volatile organic compounds (VOC’s) and sunlight ground-level ozone or smog is formed. An estimated 140.5 million Americans live in areas with unhealthy levels of smog according to the The American Lung Association. Effects on the environment and Human health : Effects on the environment and Human health Mercury One of the most dangerous pollutants released into the air through the exhaust system when coal is burned. Future of Coal: Future of Coal Economy US economy relies on coal importation and exportation The demand for coal usage to provide electricity will continue to grow Future of Coal: Future of Coal Clean coal technology A new generation of coal-burning power plants with energy processes that reduce air emissions and other pollutants. Clean Air Acts Coal power plants technology must adapt to the changing political climate towards environmental issues.