cofiring การใช้

• Cofiring relates to the combustion of two different types of materials.
• Cofiring is considered the most cost-efficient means of biomass.
• The use of cofiring does not stop this process but decreases the relative emissions of coal power plants.
• Screw extrusion is used to compact biomass into loose, homogeneous briquettes that are substituted for coal in cofiring.
• A higher combustion rate will occur when cofiring is implemented in a boiler when compared to burning only biomass.
• Some sources agree that a near-term solution for the greenhouse gas emission problem may lie in cofiring.
• Indirect cofiring, on the contrary, separates the combustion of both solid fuels, though Combustion Gasses may be mixed afterwards.
• Implementing cofiring would require few modifications to the current characteristics to power plants, as only the fuel for the boiler would be altered.
• This interest in cofiring has grown in the last decade mainly due to increasing social concern about global warming and greenhouse gas ( GHG ) emissions.
• During the last few decades research has provided very diverse solutions for cofiring biomass in coal power stations with a limited impact on efficiency, operation and lifespan.
• In addition, indirect cofiring systems are in general better for fuel mixtures where secondary fuel may include potential contaminants like heavy metals or other dangerous inorganic compounds.
• Biomass cofiring with coal, by contrast, typically occurs at efficiencies near those of the coal combustor ( 30 40 %, higher heating value basis ).
• The use of cofiring creates an energy that is not as high as pure coal, but emits fewer pollutants and cuts down on the release of previously sequestered carbon.
• Cofiring is regarded as a great opportunity for replacing coal ( solid fossil fuel ) used for power generation with renewable fuels ( biomass ) with lower costs and a direct decrease in greenhouse gas emissions.
• The percentage of original fuel replaced, also known as cofiring rate ( either expressed in mass or in energy basis ) is furthermore a definitive parameter limiting the technical solutions valid for a specific plant.
• Boilers in power plants are traditionally heated by the combustion of coal, but if cofiring were to be implemented, then the CO 2 emissions would decrease while still maintaining the heat inputted to the boiler.
• The co-firing systems, according to the current state of the art and the future perspectives, can be classified into "'direct "'and "'indirect "'cofiring technologies.
• In the present context the definition of cofiring could be : The use together of two ( or more ) fuels, the primary being fossil and the secondary from another source ( renewable or residual ), in a boiler originally designed for fossil fuel, either using the original combustion system or additional devices.
• "' Indirect cofiring "'systems imply usually more complex and expensive solutions, but they reduce usually problems related with corrosion, fouling, slagging, etc . This, a priori, allows cofiring rates larger than direct systems, that is, larger percentages of coal substituted by biomass or waste.
• "' Indirect cofiring "'systems imply usually more complex and expensive solutions, but they reduce usually problems related with corrosion, fouling, slagging, etc . This, a priori, allows cofiring rates larger than direct systems, that is, larger percentages of coal substituted by biomass or waste.