On what factors does the burning of pulverised coal depends? Explanation: Coal having high volatile matter is used for making pulverised coal. As soon as it is fired, the volatile matter starts burning which helps in increasing the rate of combustion.
What is Pulverised coal Mcq?
ANSWER: Coal broken into fine particles.
Why is Pulverised coal used?
Pulverized coal firing ensures complete combustion of coal, thus ensuring higher efficiency of steam generators. It is predominantly adopted in large coal-fired utility boilers. The finer the grinding of coal, the more efficient its combustion.
How is the fuel selected in Pulverised fuel system?
Explanation: Most of the large power plants use pulverized fuel firing system since it is higher in its thermal efficiency. And selection of it mainly depends upon the size of boiler unit, type of the coal available, nature of load on the plant, load factor, cost of the fuel and availability of skilled labors.
What is Pulverised fuel?
Pulverised fuel (PF) is coal, or sometimes hard pitch obtained from the distillation of coal tars, which has been ground into small particles. … The finely-ground fuel is burned at a nozzle or jet in a similar way to gas or liquid fuel.
Which coal will have highest ash content Mcq?
Explanation: Peat and lignite coals have low calorific value and high ash content.
What is the heating value of coal?
Heat Values of Various FuelsHeat valueNatural gas42-55 MJ/kgHard black coal (IEA definition)>23.9 MJ/kgHard black coal (Australia & Canada)c. 25 MJ/kgSub-bituminous coal (IEA definition)17.4-23.9 MJ/kgЕщё 16 строк
What are 4 types of coal?
Coal is classified into four main types, or ranks: anthracite, bituminous, subbituminous, and lignite. The ranking depends on the types and amounts of carbon the coal contains and on the amount of heat energy the coal can produce.
What is left after coal?
Coal ash is the powdery substance that remains after burning coal. … The sludge, which is created from solutions sprayed inside exhaust stacks to capture the harmful chemicals that cause acid rain, sulfur dioxide and nitrogen oxide, falls to the bottom.
What is electricity from coal called?
Steam coal, also known as thermal coal, is used in power stations to generate electricity. … The hot gases and heat energy produced converts water – in tubes lining the boiler – into steam. The high pressure steam is passed into a turbine containing thousands of propeller-like blades.
Which fuel is the final stage in the formation of coal?
What are the advantages of Pulverised fuel coal?
Advantages of Pulverized Fuel Firing
By pulverizing the coal, the surface area for combustion increases much hence thermal efficiency increases. It results in faster combustion rate and consequently reduces the requirement of secondary air to complete combustion. The burden of the air intake fans also reduces.
What fuel is PF made from?
Pulverised-fuel (PF) technology is widely used for large coal-fired power plants.
How is coal pulverized in the ball mill?
1. How is coal pulverized in the ball mill? Explanation: The pulverization in ball mill takes place as a result of action between the balls and coal, as the cylinder they are put in is made to rotate. The cylinder is partly filled with various sized steel balls.
Why is it important to prefer ash handling systems?
Why is it important to prefer ash handling systems? Explanation: Considering the large coal burning capacity plant of modern times, the amount of ash produced when the coal is burnt is in thousands of tones. It could have an effect on other subjects too if the proper ash handling methods are not followed.
What is clean coal energy?
“The term clean coal technology means any technology… deployed at a new or existing facility which will achieve significant reductions in air emissions of sulfur dioxide or oxides of nitrogen associated with the utilization of coal in the generation of electricity.”