Which coal will have highest ash content ? (D) Lignite.
Which coal will have highest ash content?
When coal is being burnt how much of ash is formed compared to the whole amount?
2. When coal is being burnt how much % of ash is formed compared to the whole amount? Explanation: The coal available in nature already contains some percent of ash and when it is burnt. Due to its brittle nature more amount of ash is produced.
What is Pulverised coal Mcq?
ANSWER: Coal broken into fine particles.
Which of the following Ash is suitable for selling?
7. Which of the following ash is suitable for selling? Explanation: Fly ash is sold in the market, which is used in concrete bricks, cement clinkers, road subbase and as mineral filler in asphaltic concrete.
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.
Which is the lowest quality of coal?
Lignite: Lignite coal, aka brown coal, is the lowest grade coal with the least concentration of carbon.
How dangerous is coal ash?
Coal ash is incredibly dangerous. Short-term exposure can bring irritation of the nose and throat, dizziness, nausea, vomiting, and shortness of breath. Long-term exposure can lead to liver damage, kidney damage, cardiac arrhythmia, and a variety of cancers.
Is coal ash good for anything?
Beneficial use of coal ash can produce positive environmental, economic and performance benefits such as reduced use of virgin resources, lower greenhouse gas emissions, reduced cost of coal ash disposal, and improved strength and durability of materials.26 мая 2020 г.
Is coal ash and fly ash the same thing?
During coal combustion, large amounts of ash are created along with carbon dioxide and other gases. The fine particle ash that rises up with the flue gases is known as fly or flue ash while the heavier ash that does not rise is called bottom ash; collectively these are known as coal ash.
Why is Pulverised coal used Mcq?
Why is pulverised coal used? … Increased calorific value of coal.
Why pulverized coal is 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.
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.
How do you get fly ash?
Where does fly ash come from? Fly ash is produced by coal-fired electric and steam generating plants. Typically, coal is pulverized and blown with air into the boiler’s combustion chamber where it immediately ignites, generating heat and producing a molten mineral residue.
What is the cost of fly ash?
The traders can sell fine fly ash in retail in the domestic market at the rate of Rs 1,200 to 1,400 per tonne, while the reported international price of fly ash per tonne ranges from $70 to $ 130.9 мая 2006 г.
What is the percentage of ash content in Indian coal?
Ash content of coal produced in the country is generally 25 to 45 % whereas average ash content of imported coal varies from 10 to 20 %. Indian Coal has comparatively higher ash content than imported coal due to drift theory of formation of coal deposits in India.