Question

large and irregular lumps of coal when fired in a boiler may leads to

Answer 1

incomplete combustion and high amount of ashes in it

Answer 2

Answer:

Large and irregular lumps of coal may cause the following problems:

• Poor combustion conditions and inadequate furnace temperature.
• Higher excess air results in higher stack loss.
• Increase of unburnt in the ash.
• Low thermal efficiency.

Explanation:

The main goal of good coal storage is to minimize carpet loss and the loss due to spontaneous combustion. The formation of a soft carpet, comprising of coal dust and soil, causes carpet loss. On the other hand, if the temperature gradually rises in a coal heap, then oxidation may lead to spontaneous combustion of coal stored. Carpet losses can be reduced by:

• Preparing a hard solid surface for coal to be stored.
• Preparing standard storage bays of concrete and brick.

SPJ2