Made with Xara
The finer ash produced in a coal fired power station, which is collected
using electro-static precipatators. Sometimes spelt as 'flyash'. This is also
know as Pulverised Fuel Ash (PFA) is some countries. About 85+% of the
ash produced is fly ash.
Furnace Bottom Ash (FBA)
The coarse ash that falls to the bottom of a furnace. The molten ash
adheres to the boiler tubes, eventually falling to the base of the furnace.
In many furnaces there is a water system that rapdily cools this ash, so
called 'wet bottomed' furnace. Usually <15% of the ash produced is FBA.
Hollow ash particles that form in the furnace gas stream. Sometime
these particles will contain smaller ash spheres. They float on water and
are usually collected from lagoons, where ash/water disposal systems are
being used. Only 1 to 2% of the ash produced are cenospheres and with
the reduction in ash/water transportation, fewer are collected/available.
Where fly ash is mixed with a proportion of water (10 to 20% by dry
mass typically) in order that it can be transported in normal tipping
vehicles without problems with dust for sale or disposal.
Flue Gas De-sulfurisation
Where a source of Calcium is injected into the furnace gas stream to
remove sulfur compounds. A typical system may consist of ground
limestone in water being passed through the gas stream. The sulfur
compounds convert the calcium carbonate to calcium sulfate, or gypsum,
which is used in the wallboard industry for general construction.
The ACAA produced in 2003 a more detailed glossary which you
can Download here.
Abbreviations & explanation
American Coal Ash Association.
See http://www.acaa-usa.org/ for more information.
Ash Development Association of Australia
Boosted Over Fire Air – a way of reducing NOx
emissions from a power station.
British Standards Institute
European Committee for Standardisation or Comité
Européen de Normalisation – the European standards body
Canada Industries Recycling Coal Ash
ECOBA European COal comBustion products
Association e.V. See www.ecoba.org for more information.
Fly Ash Bound Mixture as used in the EU.
Flue Gas Desulfurisation
Hydraulically Bound Mixtures – same as FABM, but not
necessarily containing any fly ash!
JCOAL Japan Coal Energy Center
Key Performance Indicators. Now associated with
environmental and sustainability factors, but can be
associated with any measurable parameter.
Loss On Ignition – the measure of unburnt or partially
burnt coal within an ash sample.
National Coal Ash Board - Israel
REACH Registration, Evaluation and Authorisation of
Chemicals, the EU registration system for
Separated Over Fire Air – a way of reducing NOx emissions
from a power station.
UKQAA The United Kingdom Quality Ash Association
Polish CCP Union