Why is pulverized fuel used?

Pulverised-fuel (PF) technology is widely used for large coal-fired power plants. Pulverised fuel boiler. 1: Feedwater to economiser and then to the drum; 2: steam from superheaters; 3: flue gases from the furnace; 4: blowdown to remove impurities; 5: combustion chamber. High-power output requires a swirl burner.

How is the fuel selected in the pulverized?

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.

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 Pulverised fuel ash used for?

PFA is a versatile material and has been used in a wide range of construction related processes. Its use as lightweight fill, as a cement additive, as a mixer blended concrete additive, as a component in lightweight blocks and as a grouting material are well known.

Which do you mean by pulverization?

“Pulverization” (comminution, crushing, grinding) is the process of applying an external force to a (solid) material of a certain size to destroy it and reduce it into pieces that are smaller than the original size.

Why coal is powered before burning in boiler?

As a type of thermal power station, a coal-fired power station converts chemical energy stored in coal successively into thermal energy, mechanical energy and, finally, electrical energy. The heat from the burning pulverised coal converts boiler water to steam, which is then used to spin turbines that turn generators.

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.

What kind of fuel is coal?

fossil fuel
Coal is called a fossil fuel because it was made from plants that were once alive! Since coal comes from plants, and plants get their energy from the sun, the energy in coal also came from the sun. The coal we use today took millions of years to form.

Does fly ash Change concrete color?

Color Variability It is more difficult to control the color of concrete containing fly ash than mixtures with Portland cement only. Fly ash also may cause visual inconsistencies in the finished surface, such as dark streaks from carbon particles.

Where does Pulverised fuel ash come from?

Cenospheres are a by-product from coal ash, recovered from ash ponds or lagoons typically located at the same site as a coal-fired power station. They are fine, rigid hollow spheres and – often filled with air or inert gas. They are often used as low density fillers and in the creation of lightweight concrete.

Which is used in pulverization?

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.