How is coal stored in a bunker?

Silos. In this type of bunker, coal is stored either in the form of a conical pile or in the form of a wedge-shaped pile. The coal is pumped onto the ground through a telescopic chute so as to minimise size degradation and size segregation.

Are coal bunkers practical?

Although coal bunkers of large capacity form an important part of power stations and similar plants, the technical literature contains little information concerning their practical design.An attemp...

What is a coal bin?

A coal bin, coal store or coal bunker is a storage container for coal awaiting use or transportation. This can be either in domestic, commercial or industrial premises, or on a ship or locomotive tender, or at a coal mine or processing plant. Domestic coal bunkers are associated with the use of coal in open fires or for solid-fuel central heating.

How does a coal bunker work?

The coal is pumped onto the ground through a telescopic chute so as to minimise size degradation and size segregation. The blending efficiency is a little better than a normal bunker but dust and rainwater cause constant trouble in this case. Coal is reclaimed by feeders and discharged into the collecting conveyor (Fig. 11.7). Figure 11.7.

What is the maximum size a coal bunker can crush?

It has been stressed that the coal supplier should initially crush the materials to a maximum size such as 300 mm, but they may be something else depending on the agreement or coal tie up. To circumvent the situation, the CHP keeps a crushing provision so that coal bunkers receive the materials at a maximum size of about 20–25 mm.

How can coal be withdrawn from a bunker?

The coal can be withdrawn by means of controlled operation of feeders. By this system, good blending efficiency can be obtained. There is one drawback – segregation takes place between coarse and fine particles because the pile within the bunker takes the shape of a cone. Also, at the time of withdrawal, fine particles are discharged first.