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 coal is pulverized?
Pieces of coal are crushed between balls or cylindrical rollers that move between two tracks or “races.” The raw coal is then fed into the pulverizer along with air heated to about 650 °F (340 °C) from the boiler. … The powdered coal from the pulverizer is directly blown to a burner in the boiler.
On what factors does the burning of Pulverised coal depends?
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 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.
What is Pulverised coal Mcq?
ANSWER: Coal broken into fine particles.
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.
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 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.
Which coal will have highest ash content Mcq?
Explanation: Peat and lignite coals have low calorific value and high ash content.
Which equipment is used for pulverizing the coal?
A pulverizer or grinder is a mechanical device for the grinding of many different types of materials. For example, a pulverizer puritch is used to pulverize coal for combustion in the steam-generating furnaces of coal power plants.
What fuel is PF made from?
Pulverised-fuel (PF) technology is widely used for large coal-fired power plants.
Which fuel is the final stage in the formation of coal?
How does coal boiler work?
Coal-fired plants produce electricity by burning coal in a boiler to produce steam. The steam produced, under tremendous pressure, flows into a turbine, which spins a generator to create electricity. The steam is then cooled, condensed back into water and returned to the boiler to start the process over.
Which power plant normally operates at high speeds?
In thermal power plant, the steam turbine is operated as high speed as high speed abot of 1500 to 3000 rpm. Hydraulic turbine.
What is the advantage of stocking the coal in huge heaps?
What is the advantage of stocking the coal in huge heaps? Explanation: Coal is piled in heaps of 10 to 12m height on a concrete floor, by compacting it in the layers of 20 to 30cm thickness using bulldozers. This prevents air circulation in the interior of the heap.
What is the percentage of ash content in Indian coal?