Fuels and Combustion Anthracite coal Contains more volatile matter than bituminous coal Is essentially a coking coal Ignites more easily than bituminous coal Burns with short, bluish, yellow-tipped flame producing very little smoke Contains more volatile matter than bituminous coal Is essentially a coking coal Ignites more easily than bituminous coal Burns with short, bluish, yellow-tipped flame producing very little smoke ANSWER DOWNLOAD EXAMIANS APP
Fuels and Combustion Temperature of preheated air used for the transportation of pulverised coal through pipes to the burner of a boiler furnace is restricted to a maximum limit of about 300° C to avoid the Requirement of large volume combustion chamber Incomplete combustion of coal Chances of clinker formation Risk of explosion Requirement of large volume combustion chamber Incomplete combustion of coal Chances of clinker formation Risk of explosion ANSWER DOWNLOAD EXAMIANS APP
Fuels and Combustion Mineral matter content (M) and ash content (A) in coal are approximately related as M = 2A M = A M = 1.5A M = 1.1A M = 2A M = A M = 1.5A M = 1.1A ANSWER DOWNLOAD EXAMIANS APP
Fuels and Combustion In low temperature carbonisation of coal as compared to high temperature carbonisation __________ produced is less. Yield percentage of coke Difference in gross & net calorific value of the coke oven gas Free carbon content in tar Yield of ammonia present in coke oven gas Yield percentage of coke Difference in gross & net calorific value of the coke oven gas Free carbon content in tar Yield of ammonia present in coke oven gas ANSWER DOWNLOAD EXAMIANS APP
Fuels and Combustion Quantity of coke oven gas produced by high temperature carbonisation of one ton of dry coal may be around __________ Nm³. 3000 30 30, 000 300 3000 30 30, 000 300 ANSWER DOWNLOAD EXAMIANS APP
Fuels and Combustion The optimum percentage of excess air for combustion depends upon the __________ of the fuel. Type (solid, liquid or gaseous) Calorific value Sulphur content Ignition temperature Type (solid, liquid or gaseous) Calorific value Sulphur content Ignition temperature ANSWER DOWNLOAD EXAMIANS APP
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