Limestone handling

Large quantity of limestone is used for the Flue Gas Desulphurization (FGD) of coal fired power stations.

In case of pulverized coal fired units (PC) in most cases wet FGD technology is used where desulphurization takes place in spraying towers. For this propose fine grinded limestone (below 90 micron) is used for slurry.
In case of fluid bed boilers (CFB) the desulphurization takes place mainly in the combustion chamber of the boiler. The grinded limestone is injected pneumatically into this chamber. Particle size of limestone required for this technology is bigger compared to wet FGD systems.

Limestone handling technology for PC units mainly includes:

• Wagon or truck unloading station
• Limestone storage silo, its aeration and venting
• Limestone discharge to slurry preparation tank

Limestone handling technology for CFB units mainly includes:

• Wagon or truck unloading station
• Limestone storage silo, its aeration and venting
• Limestone discharge and pneumatic conveying to daily silo(s)
• Pneumatic limestone injection into combustion chamber

EWB has experience and refernce for both system listed above up to power stations size 1000 MW.

Other than limestone we have experience and reference for handling bulk materials such as: gypsum, perlite, alumina, klinker dust, cement, coal dust, oil ash and many others.