What problems do coal-fired power stations cause?
Air pollution from coal-fired power plants is linked with asthma, cancer, heart and lung ailments, neurological problems, acid rain, global warming, and other severe environmental and public health impacts.
What is Hele coal technology?
HELE coal-fired power plants produce more electricity using less coal by harnessing new generation technology and materials. HELE plants operate at higher temperatures and air pressure to more rapidly convert water to steam.
What is the working pressure of ultra-supercritical boiler in bar?
Ultra-supercritical steam conditions now use supercritical pressures up to 300bar with 600°C steam and reheat steam temperatures. This gives a net efficiency of 46%. “Huaneng Yuhuan power plant is equipped with four ultra-supercritical coal-fired power generating units of 1,000MW capacity each.”
What is the efficiency of a supercritical coal power plant?
At this higher pressure and temperature, water can be maintained as a fluid despite being above the atmospheric boiling plant, allowing greater efficiency. Efficiency ratings for supercritical coal plants range from 37% to 40%.
What is the difference between subcritical and supercritical coal combustion?
The difference between subcritical, supercritical, and ultra-supercritical versions of pulverized coal combustion technology has to do with the steam pressure within the boiler. In a subcritical plant, steam pressure is below 3200 pounds per square inch and temperature is below 1025 degrees Fahrenheit (550 degrees Celsius).
What is advanced ultra-supercritical (AUSC) technology?
The EU, USA, Japan, India and China all have material research programmes aiming for the next generation of increased steam temperatures and efficiency, known as advanced ultra-supercritical (AUSC) or 700°C technology. This report reviews developments and status of these major material research programmes.
What is ultra-supercritical steels?
Ultra-supercritical (USC) steam parameters followed with improved martensitic 9–12% chromium steels (such as grade 92) and austenitic steels (such as HR3C and Sanicro 25). State-of-the-art USC technology has reached a superheater temperature of 604ºC and electrical efficiencies of 47% (net, LHV, hard coal).