Question: Why pulverized coal is used?

Why is pulverized coal used Mcq?

Why is pulverised coal used? … Increased calorific value of coal.

What do you mean by pulverized coal?

Definition: Refers to any combustion process that uses very finely ground (pulverized) coal in the process. The coal powder is blown into the combustion zone of a furnace and burns more rapidly and efficiently because finely ground coal has more surface area per unit weight than larger particles.

What is pulverized fuel used for?

Pulverised-fuel (PF) technology is widely used for large coal-fired power plants. In such systems, the fuel particles are injected pneumatically at high velocity (the primary air is used as a carrier) through a burner nozzle into the furnace (Fig.

Why is coal pulverized into dust?

The concept of burning coal that has been pulverized into a fine powder stems from the belief that if the coal is made fine enough, it will burn almost as easily and efficiently as a gas. … Under operating conditions, there is enough heat in the combustion zone to ignite all the incoming fuel.

Which coal has highest ash content?

Coking coal– the carbon content is around 43%-86%. It is a type of bituminous coal. Hence, lignite has the least carbon content which means that it has the highest ash content.

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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.

How can we transport pulverized coal?

4. How can we transport pulverised coal? Explanation: It becomes easy to handle and transport the pulverised coal if a strong stream of air is continuously passed though the coal powder. This work can also be done by using screw conveyer to keep the pulverised coal fresh.

Why do we use economiser?

An economizer is a mechanical device used to reduce energy consumption. Economizers recycle energy produced within a system or leverage environmental temperature differences to achieve efficiency improvements.

What is the basic principle of regeneration?

What is the basic principle of regeneration? Explanation: In regeneration steam from condenser is circulated through turbine to increase steam temperature before it enters boiler. Explanation: Feedwater is preheated so as to decrease the fuel consumption which increases efficiency.