Forced draught fans move ambient air at low pressure through the air preheater to provide heated oxygen for the combustion process.

Induced draught fans are vital in maintaining furnace pressure at just below atmospheric pressure. They draw the flue gases out of the boiler into the air preheater.

Primary air fans are used to move air through the air preheater in coal and biomass fuelled stations. The size and configuration of the fan depends on the temperature of the primary air.

Secondary air fans feed into the boiler combustion chamber at a higher point than the primary air to promote more complete combustion.

Cooling fans are used to condense steam into water and help to increase the pressure difference over the steam turbine.

Air preheaters are used to recover heat from flue gases and use it to raise the temperature of air entering the combustion chamber.

Howden’s ExVel turbo fan has been developed specifically for Mechanical Vapour Compression – an advanced and efficient process to be used also in zero liquid discharge (ZLD) application to fulfill expectations for environmentally friendly power plant - recycling the vapour during the evaporation process to re-use the energy it contains.

Gas gas heaters are used to reheat the gas in flue gas desulphurisation plants and SCR systems.

Gas recirculation fans help control furnace gas or steam temperature by re-circulating flue gas through a dust collector and back into a particular area of the combustion chamber.

Flue Gas Desulphurisation (FGD) or Selective Catalytic Reduction (SCR) Booster fans help to drive the flue gas through cleaning processes before it is released from the station.

Oxidation air blowers are associated with the cleaning of flue gases in a Flue Gas Desulphurisation (FGD) by supplying air into absorber or spray tower.

Blowers providing fluidising air within the loop seal system on a circulating fluidised bed (CFB) boiler.