Thermal energy
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Thermal energy

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Thermal energy Thermal energy Presentation Transcript

  • Thermal energy • Thermal means heat • It means production of energy from heat
  • Thermal energy – Thermal energy is the energy a substance or system has related to its temperature, i.e., the energy of moving or vibrating molecules. Atoms and molecules, the smallest particles of any substance, are always in motion. The motion of thermal energy is usually not visible, but we can feel or see its effects. We use thermal energy to cook our food and heat our homes, and we use it to generate electricity.
  • There are many types which come under Thermal energy • Preparation of energy from coal • Geothermal energy • Nuclear energy is also come under thermal energy
  • • Main fuel source is coal – Let us consider the power generation through coal
  • Generation of power from coal • Thermal power plant contain mainly 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 Steam Turbine Generator:- Is a series of steam turbines interconnected to each other and then a generator
  • Steam Condenser:- Steam enters from 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.
  • Brief Explanation of generation of power from coal • Coal is delivered from the coal wash plant to the power plant where it is placed in a large • coal storage facility. • A conveyor transports the coal to a pulverizer where it is ground into a fine powder. • The fine, powdery coal is blown into the boiler where it is burned. Water passes through • tubes in the boiler walls where it is heated to produce high temperature and pressure • steam. • Waste (flue) gases and small particles of non combustible materials (fly ash) produced in • the coal burning process are contained and treated before exiting up a chimney or stack.
  • • The high temperature and pressure steam created in the boiler turns the turbine blades. • The spinning turbine blades drive the generator to create electricity. The electricity • generated is stepped up by a transformer to 240 kilovolts and transmitted, through a • substation into the high voltage Alberta electric grid. • The exhaust steam from the turbine is routed through a condenser which serves to • advance the conversion of the steam back to its liquid state. The exhaust steam is • recycled as water to the boiler to repeat the process.
  • • The condenser is cooled either by an air-cooled or water-cooled system. • Solids within the water that is used for steam generation is treated before it enters the • Boiler. The treated, de-mineralized water helps to reduce pipe corrosion within the boiler • and condenser. • Heavier non combustible materials (bottom ash) produced in the coal burning process fall • to the bottom of the boiler where they are extracted.
  • Advantages The fuel used is quite cheap. • Less initial cost as compared to other generating plants. • It can beinstalled at any place iirespective of the existence of coal. The coal can be transported to the site of the plant by rail or road. • It require less space as compared to Hydro power plants. • Cost of generation is less than that of diesel power plants.
  • Disadvantages • It pollutes the atmosphere due to production of large amount of smoke and fumes. • It is costlier in running cost as compared to Hydro electric plants.
  • Share of coal in generation of power
  • Effects on the environment and Human health • CO2 ~ carbon dioxide pollution, making energy use the single largest source of greenhouse gases • Sulfur 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. • Mercury One of the most dangerous pollutants released into the air through the exhaust system when coal is burned.