Читать книгу Coal-Fired Power Generation Handbook - James Speight G., James G. Speight - Страница 93

In cone shell method, coal is added to the pile in a cone shape until the final pile height is reached. The stockpiling unit begins to spill the first cone, then moves one step forward to spill the second cone until the stockpile height and continues the operation step by step. This method can be applied in areas where long and rigorous winter conditions prevail in order to ensure that stockpiled coal is affected by rain water at minimum level. Stockpiling in a single cone tends to cause size segregation, with coarser material moving out towards the base. In raw cone ply stockpiling, additional cones are added next to the first cone.

A good blend is obtained when the coal is taken from the stockpile by a reclaimer. For an optimum blend, the reclaimer has to work perpendicularly to the long axis of the stockpile. To adjust the calorific value of the blend, high calorific valued coal can be added during the stockpiling operation.