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Environmental Impact of Coal- Fired Power Stations

Environmental Impact of Coal- Fired Power Stations. by Rob Glaser. Main Environmental Issues. 1. Coal supply and storage and quality of the coal 2. Internal transport systems 3. Coal fired boilers 4. Power generation 5. Emissions. 1. Coal supply, storage, and quality of coal. Issues:

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Environmental Impact of Coal- Fired Power Stations

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  1. Environmental Impact of Coal- Fired Power Stations by Rob Glaser

  2. Main Environmental Issues 1. Coal supply and storage and quality of the coal 2. Internal transport systems 3. Coal fired boilers 4. Power generation 5. Emissions

  3. 1. Coal supply, storage, and quality of coal Issues: • Mining activity dust control • Fires/ explosions during mining operation • Traffic • Rehabilitation / top soil preservation/ quarantines • Leaching and groundwater controls

  4. 1. Coal supply, storage, and quality of coal ...Continuation 1 • Treatment of leachate • Monitoring obligations during mining operations • Quality of the coal/ analyses • Intermediate storage on site of the mine as well as at the power station • Self ignition and fires • Heating value losses • Transport systems

  5. 2. Internal transport systems • Issues: •  Day bunkers and safety • Grinders •  Dual burners

  6. 3. Coal fired boilers Issues: • Technology • Low NOx/SOx technology • Pre heating of burner air • On line operation of cleaning • Slag reception systems • Water treatment of slag quenching systems • Boiler feed water preparation • An/cat ion exchange system • Softening system • Hydrazine

  7. 4. Power generation Issues: • Thermal efficiency • Transformers PCB’s • Noise • Cooling towers • Preservation and cleaning systems • Percentage blow-off and treatment

  8. 5. Emissions Air: • storage (dust ,VOC’s.) • storage of waste from power plant • stack emissions • (NOx SOx dust , F , Hy metals, Cd, • Radioactive components • part sizedistribution/eff.) • monitoring data emissions

  9. 5. Emissions ... continuation 1 Water: • slag water (Hg, Cd, pac’s, CN, total Hy metals) • sluice water • storage leachate • groundwater (coal/wastes) • softening water sluice • spraywater on storage • rainwater • treatment plant • boiler feedwater treatment and sluice water

  10. 5. Emissions ... continuation 2 Waste: • ESP waste composition • waste composition • cleaner technology • storage sites (disposal) • dust emissions from waste disposal site • rehabilitation of waste site • groundwater protection and monitoring system • maintenance waste (cleaning, workshop, boiler cleaning, asbestos?) • PCB’s from transformers • waste oils • monitoring and reporting

  11. 5. Emissions ... continuation 3 • Noise: • powerplant • transformer stations • mills

  12. 6. General environmental issues •  Ambient quality standards •  Monitoring obligations •  Future developments •  Cleaner technology •  Alternative fuels •  Waste utilization •  Energy optimization •  Low NOx and Low SOX technology

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