Moisture content has a significant impact on the conveying characteristics of dense-phase pneumatic conveying of pulverized lignite under high pressure up to 4 MPa by using nitrogen as carrier gas.The objective of this work was to reveal the influence mechanisms of moisture content on the conveying characteristics in more detail and obtain a critical moisture content to distinguish the ...
High fuel moisture has several adverse impacts on the operation of a pulverized coal generating unit, for it can result in fuel handling problems and it affects heat rate, stack emissions and maintenance costs.
However, lignite and PRB coals typically contain high amounts of moisture and/or ash. When high moisture coals are burned in utility boilers, about 7 percent of the fuel heat input is used to evaporate fuel moisture.
These curves indicate that high volatile subbituminous coals with volatile content on the order of 50% on a dry, ash free basis, result in ignition temperatures in the order of 300 to 400 OF.
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Lignite boilers use recirculated Flue gas from the top of the furnace to heat and remove the moisture. The temperature of the flue gas will be in the order of 800 °C and above. This gives sufficient heat for the high moisture removal.
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Lignite is brownish-black in color and has a carbon content around 60–70 percent, a high inherent moisture content sometimes as high as 75 percent, and an ash content ranging from 6–19 percent compared with 6–12 percent for bituminous coal.
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GE's Tower boiler configuration has been developed mostly for high moisture lignite. It eliminates change in direction of gas flow reducing erosion potential for more difficult to burn fuels while offering specialized firing systems to burn all types of lignite.
A gas burner heating a high moisture lignite wind speed pulverizing system . Download PDF Info Publication number CN103925606B.
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Advanced Development of Pulverized Coal Firing Technologies TAMURA Masato : ... However, lignite coals have a high moisture content in the range of 40% to 60%, and thus have a lower combustion efficiency when fired in boilers directly after pulverization. For this reason, despite ... lignite coals showed high combustion efficiency under all …
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