Today's power generation markets are characterized by rising energy consumption,volatile gas prices and stable coal prices.Following the Kyoto protocol there are also needs towards the conservation of fossil fuel ...Today's power generation markets are characterized by rising energy consumption,volatile gas prices and stable coal prices.Following the Kyoto protocol there are also needs towards the conservation of fossil fuel resources and requirements to reduce CO2emissions.The ultra supercritical fossil power plant is an option for high-efficiency and low-emissions electricity genera-展开更多
Efficient power generation and transmission
Efficient power generation involves converting as much of the primary energy used in a power plant as possible into electricity and usable heat. Increasing efficiency in fo...Efficient power generation and transmission
Efficient power generation involves converting as much of the primary energy used in a power plant as possible into electricity and usable heat. Increasing efficiency in fossil fuel power plants by just a few percentage points can save substantial resources and significantly decrease CO2 emissions. In case of renewable energy sources, the effi- ciency determines the costs of energy generation and thereby how competitive they are compared to conventional power plants.展开更多
Three steps towards mastering the energy challenge Turning the resources nature has provided us with into clean and sustainable energy supplies that meet future demands requires the consistent utilization of all possi...Three steps towards mastering the energy challenge Turning the resources nature has provided us with into clean and sustainable energy supplies that meet future demands requires the consistent utilization of all possibilities in the energy mix.Siemens is banking on three key steps:optimization of the energy mix,efficiency enhancement along the展开更多
To reduce the effect of global warming on our climate,the levels of CO2emissions should be reduced.One wayto do this is to increase the efficiency of electricity production from fossil fuels.This will in turn reduce t...To reduce the effect of global warming on our climate,the levels of CO2emissions should be reduced.One wayto do this is to increase the efficiency of electricity production from fossil fuels.This will in turn reduce the amountof CO2emissions for a given power output.Using US practice展开更多
(Continued from the previous issue)This clearly indicates that the overall loss can be most easily reduced by reducing the profile loss throughout the entire turbine.The secondary flow loss is of significance for thos...(Continued from the previous issue)This clearly indicates that the overall loss can be most easily reduced by reducing the profile loss throughout the entire turbine.The secondary flow loss is of significance for those stages that are characterized by a low aspect ratio(ratio of blade height to blade chord),i.e.the front stages of the HP and IP turbine component.Leakage losses are relatively high in the admission sections to the HP and IP turbines.In general,the flow field in steam turbines is,at least to some extent,characterized by fully three-dimensional effects.This is particularly true for low aspect ratio turbines there the secondary flows generated close to the展开更多
(Continued from the previous issue)Power to drive the shuttle and its aircraft load comes from expanding steam piped to the catapult from the main steam system(Figure 3.8.2).This steam is placed under pressure in larg...(Continued from the previous issue)Power to drive the shuttle and its aircraft load comes from expanding steam piped to the catapult from the main steam system(Figure 3.8.2).This steam is placed under pressure in large tanks(called accumulators or receivers)located under the launching engine.Steam is admitted to the receivers through the flow control valve(sometimes called steam charging valves).From the receivers,the steam is transferred at the moment of launch into the power cylinders.Steam acts directly on the pistons and propels the piston-shuttle assembly through the cylinders.展开更多
Today's solar cells do not yet take the full advantage of all the light that shines on them.Solar thermal energy converters are an alternative to photovoltaic cells that have the potential to reach much higher eff...Today's solar cells do not yet take the full advantage of all the light that shines on them.Solar thermal energy converters are an alternative to photovoltaic cells that have the potential to reach much higher efficiencies at much lower costs.Now researchers from the Universities of Bristol and Exeter,UK,have found a new way to efficiently absorb each sunray of its energy,bringing us one step closer to that potential.展开更多
Selective Catalytic Reduction(SCR)system is a means of converting nitrogen oxides or NO_x produced by combustion with the aid of a catalyst into diatomic nitrogen and water.SCR system for NO_x reduction uses ammonia a...Selective Catalytic Reduction(SCR)system is a means of converting nitrogen oxides or NO_x produced by combustion with the aid of a catalyst into diatomic nitrogen and water.SCR system for NO_x reduction uses ammonia as reducing agent and is added to the flue or exhausts gas and is adsorbed onto a catalyst.展开更多
Airborne wind energy is a new class of wind energy converters that employs flying tethered wings or aircraft to reach winds blowing at atmosphere layers that are inaccessible by traditional wind turbines.The autonomou...Airborne wind energy is a new class of wind energy converters that employs flying tethered wings or aircraft to reach winds blowing at atmosphere layers that are inaccessible by traditional wind turbines.The autonomous aircraft moves in a regular cross-wind figure-8 pattern at high altitudes and in turn,turns a winch via a line,driving a power generator.Research on airborne wind energy started in the mid seventies,and has gained noticeable展开更多
文摘Today's power generation markets are characterized by rising energy consumption,volatile gas prices and stable coal prices.Following the Kyoto protocol there are also needs towards the conservation of fossil fuel resources and requirements to reduce CO2emissions.The ultra supercritical fossil power plant is an option for high-efficiency and low-emissions electricity genera-
文摘Efficient power generation and transmission
Efficient power generation involves converting as much of the primary energy used in a power plant as possible into electricity and usable heat. Increasing efficiency in fossil fuel power plants by just a few percentage points can save substantial resources and significantly decrease CO2 emissions. In case of renewable energy sources, the effi- ciency determines the costs of energy generation and thereby how competitive they are compared to conventional power plants.
文摘Three steps towards mastering the energy challenge Turning the resources nature has provided us with into clean and sustainable energy supplies that meet future demands requires the consistent utilization of all possibilities in the energy mix.Siemens is banking on three key steps:optimization of the energy mix,efficiency enhancement along the
文摘To reduce the effect of global warming on our climate,the levels of CO2emissions should be reduced.One wayto do this is to increase the efficiency of electricity production from fossil fuels.This will in turn reduce the amountof CO2emissions for a given power output.Using US practice
文摘(Continued from the previous issue)This clearly indicates that the overall loss can be most easily reduced by reducing the profile loss throughout the entire turbine.The secondary flow loss is of significance for those stages that are characterized by a low aspect ratio(ratio of blade height to blade chord),i.e.the front stages of the HP and IP turbine component.Leakage losses are relatively high in the admission sections to the HP and IP turbines.In general,the flow field in steam turbines is,at least to some extent,characterized by fully three-dimensional effects.This is particularly true for low aspect ratio turbines there the secondary flows generated close to the
文摘(Continued from the previous issue)Power to drive the shuttle and its aircraft load comes from expanding steam piped to the catapult from the main steam system(Figure 3.8.2).This steam is placed under pressure in large tanks(called accumulators or receivers)located under the launching engine.Steam is admitted to the receivers through the flow control valve(sometimes called steam charging valves).From the receivers,the steam is transferred at the moment of launch into the power cylinders.Steam acts directly on the pistons and propels the piston-shuttle assembly through the cylinders.
文摘Today's solar cells do not yet take the full advantage of all the light that shines on them.Solar thermal energy converters are an alternative to photovoltaic cells that have the potential to reach much higher efficiencies at much lower costs.Now researchers from the Universities of Bristol and Exeter,UK,have found a new way to efficiently absorb each sunray of its energy,bringing us one step closer to that potential.
文摘Selective Catalytic Reduction(SCR)system is a means of converting nitrogen oxides or NO_x produced by combustion with the aid of a catalyst into diatomic nitrogen and water.SCR system for NO_x reduction uses ammonia as reducing agent and is added to the flue or exhausts gas and is adsorbed onto a catalyst.
文摘Airborne wind energy is a new class of wind energy converters that employs flying tethered wings or aircraft to reach winds blowing at atmosphere layers that are inaccessible by traditional wind turbines.The autonomous aircraft moves in a regular cross-wind figure-8 pattern at high altitudes and in turn,turns a winch via a line,driving a power generator.Research on airborne wind energy started in the mid seventies,and has gained noticeable
