Читать книгу Coal-Fired Power Generation Handbook - James Speight G., James G. Speight - Страница 92

Windrow stockpiles can be created using different techniques of stockpiling. One method is to use a bridge and tripper conveyor system, though this alternative is feasible only for stationary applications. One significant disadvantage of stationary conveyor systems is that they are typically fixed in height, which can result in segregation by wind, as discussed earlier. Another method is to use a telescoping conveyor. Telescoping conveyors are typically preferred over stationary systems because they can be relocated when necessary, and many are actually designed to be road-portable.

In the process, the stockpiling machine moves on rails and spills the coal in parallel rows along the length of the silo by changing the boom angle from the ground level. The stockpiling operation is achieved by the back-and-forth movement of the unit along the stockpiling area and beginning to spill the first rows then the second, third rows, and as many rows are as required.

A good blend can be obtained when the coal is taken by a reclaimer from the stockpile formed with this method. The disadvantage of this method is collection of rain water between the coal rows and penetration in the stockpile as a result of long-lasting and continuous rainfall.