Diamond Power International, Inc., a subsidiary of B&W, is an industry pioneer in providing ash handling systems, replacement parts and service for utility and industrial customers.
The ash handling systems of a steam generating plant collect the ash and residue from the combustion of solid fuels from different points along the boiler flue gas stream, transport it to storage bins or silos, and prepare the ash for transport or disposal. Because the characteristics of ash are very different from the front to the back of the boiler, the collection, transport, and storage systems are usually separate for the furnace and collection points downstream.
In a coal-fired boiler, the general categories of ash are:
- Bottom ash - the material that collects at the bottom of the furnace, possibly a heavy slag.
- Mill rejects - the heavy pieces of stone, slate and iron pyrite that are discharged from the coal pulverizer.
- Economizer ash or popcorn ash - the course and comparatively dense particles that drop out of the flue gas when the gas changes direction abruptly, such as in the back pass and air heater ducts.
- Flyash - the fine ash particles that are collected in the dust collection equipment.
Although bottom ash and mill rejects are unique to pulverized coal-fired boilers, the above classification is generally useful for describing the different types of ash handling equipment.
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