What is the function of seal air fan in boiler?

Seal air blowers eliminate leakage from pressurised air systems, typically in power generation plant coal mills. Dust can enter the mill roller and cause problems where blowers are not used.

What is mill Bowl DP?

The differential pressure across the bowl (“bowl DP”) is an indication of flow restrictions through the mill. Bowl differential is the combined draft loss across the vane wheel and the coal retained above the bowl. Bowl DP varies with airflow and differing amounts of coal retained in the grinding zone.

What is a mill in power plant?

A tube mill is a revolving cylinder of up to five diameters in length used for fine pulverization of ore, rock, and other such materials; the material, mixed with water, is fed into the chamber from one end, and passes out the other end as a slurry.

What is LDO in power plant?

LDO means light diesel oil which come in between the destination process of petrol and Diesel. This is only for industrial use only. As I know that in power plant this was used for Light up the Boiler upto reaching coal ignition temperature mean up to reaching boiler temperature 400 c to 500 c .

What is Seal air?

Sealed Air brings together packaging materials, equipment, services, and automation to provide essential protection for products and people.

What happens due to the pressure in the pulverizer?

What happens due to the pressure in the pulverizer? Explanation: As the casing of the pulverizer is under pressure, the leakage of fine coal through the mill casing causes the pulverized fuel to be blown out into the boiler room.

How does a coal mill work?

Mills A ball or roller between two races or rings provides the grinding surfaces on which pulverization occurs. Raw coal enters the top of the pulverizer through the raw coal feed pipe. The raw coal is then pulverized between the roll and rotating ring.

Which oil is used in boiler?

fuel oil, also called furnace oil, fuel consisting mainly of residues from crude-oil distillation. It is used primarily for steam boilers in power plants, aboard ships, and in industrial plants. Commercial fuel oils usually are blended with other petroleum fractions to produce the desired viscosity and flash point.

Is diesel a light oil?

Light diesel oil (LDO) is a non-automotive diesel fuel that is mainly used in low RPM engines and Equipments. Light Diesel Oil is a type of diesel fuel that has flash point greater than 66 deg C and is widely used in certain types of boilers and furnaces as basic fuel.

What is the purpose of the seal air fan in thermal power plant?

Seal air fans are used to supply the high pressure air to the COAL mill bowl. These fans create a layer of pressurised air to prevent the contamination of oil of mill plenatary GEAR box due COAL dust. Originally Answered: What is the purpose of the seal air fan use in thermal power plant? Seal air fans are used in coal mills for sealing purpose.

What is millmill in a boiler?

Mill is one of the very essential item of Boiler. Choice of MILLS depend on the coal characteristic of the fuel. Number of mills guide the height of furnace . There are different type of mills , Bowl Mill, Tube mill , Ball and race mills etc are available in India. There are pressurised Mill and suction type Mill.

Why is there a minimum airflow through a coal mill?

This occurs because a minimum airflow through the coal mill must be maintained to insure that burner line velocities are not too low to allow settling of coal in the fuel lines or burner components. Not uncommon to achieve air to fuel ratios of 3 to 5 pounds of air per pound of coal.

What is the working principle of a bowl mill?

1. Principle of Operation Bowl Mill is driven by AC motor, coupled with flexible coupling to the worm shaft. The worm shaft drives worm gear, mounted on the Main Vertical Shaft. A bowl mounted on the top of the shaft rotates at a speed of 40 to 65 rpm.