Fuels and Combustion Fuel gases containing hydrocarbons (ie.g. coke oven gas) are not preheated before burning, mainly because It reduces its calorific value tremendously It reduces its flame temperature tremendously There are chances of explosion during preheating The hydrocarbons crack thereby choking and fouling the heat transfer surface by carbon soot It reduces its calorific value tremendously It reduces its flame temperature tremendously There are chances of explosion during preheating The hydrocarbons crack thereby choking and fouling the heat transfer surface by carbon soot ANSWER DOWNLOAD EXAMIANS APP
Fuels and Combustion In Lurgi coal gasifier, Low carbon conversion efficiency is achieved Entrainment of solids is higher Larger quantity of coal can be processed Coking coals cannot be used Low carbon conversion efficiency is achieved Entrainment of solids is higher Larger quantity of coal can be processed Coking coals cannot be used ANSWER DOWNLOAD EXAMIANS APP
Fuels and Combustion Calorific value of dry wood may be around __________ Kcal/kg. 500 5000 50 5 500 5000 50 5 ANSWER DOWNLOAD EXAMIANS APP
Fuels and Combustion Theoretical flame temperature of a fuel is that temperature which is attained, when the fuel is completely burnt 'using theoretical amount of air in Oxygen Either A or C without gain or loss of heat Air Either A or B Oxygen Either A or C without gain or loss of heat Air Either A or B ANSWER DOWNLOAD EXAMIANS APP
Fuels and Combustion Combustion of pulverised coal as compared to that of lump coal Can be done with less excess air Develops a low temperature flame Provides a lower rate of heat release Develops a non-luminous flame Can be done with less excess air Develops a low temperature flame Provides a lower rate of heat release Develops a non-luminous flame ANSWER DOWNLOAD EXAMIANS APP
Fuels and Combustion During combustion of coal on grate, clinker formation is increased by the Use of preheated primary air All of these Use of thick fire bed Low fusion point of ash (< 1100° C) Use of preheated primary air All of these Use of thick fire bed Low fusion point of ash (< 1100° C) ANSWER DOWNLOAD EXAMIANS APP