Flue Gas Desulfurization
Lenntech delivers reliable and cost-effective solutions for flue gas desulphurization waste water treatment for discharge or reuse as process water.
Based on a wide range of technologies and extended process expertise with extensive project delivery experience in all industrial water related sectors, Lenntech integrates different water treatment technologies to provide reliable and cost-effective end-to-end solutions to treat FGD blowdown water.
Flue gas has its origin from the combustion of coal in power plants. Combustion of fossil fuels for energy production generates by-products as bottom ash and fly ash and flue gas emissions to the atmosphere. The primary gases result from combustion of coal are sulfur oxides and nitrates. Secondary pollutants are heavy metals, boron, etc. Sulfur present in coal is converted for 95% to sulfur dioxide (SO2) when burned. Reduction of emissions from sulfur oxide emitting processes is increasingly being carried out world-wide in the last years, due to stringent legal limits for effluent discharge.
Typical SO2 removal processes are wet scrubbing and dry scrubbing. In wet scrubbing systems, the ones mostly used, the fly ash is removed first by an electrostatic precipitator (ESP), then the flue gas passes into the SO2 absorber. Electrostatic precipitator performance is often enhanced by adding ammonia to the flue gas. The flue gas exiting the absorber is highly corrosive, because it’s saturated with water and still containing SO2. These highly corrosive gasses can damage any downstream equipment. Using corrosive resistance materials or reheating the gasses above dew point minimize corrosion.
In dry injection or spray drying systems, the SO2 reacts first with limestone before removing particulates from the flue gas.
Flue gas desulfurization advantages & disadvantages
Advantages
- High SO2 removal efficiency up to 90%
- Re-usable products of reaction
- Retrofit of existing equipment is not difficult (moderate to low)
- Used reagents are inexpensive and readily available
Disadvantages
- High capital and O&M costs
- Scaling and deposit of wet solids on absorber and downstream equipment
- Wet FGD system generates a waste water product and need to be treated before disposal
Lenntech provides sustainable and complete solutions for FGD waste water treatment and reuse considering a wide range of technologies and strategies. With worldwide growing water demand and water scarcity, our solutions are suitable for reducing cooling tower operational costs and water footprint.
Our advantages
- Engineered and custom designed solutions
- Turn-key solutions including design, engineering, manufacturing, automation, installation, maintenance and training.
- State-of-art technologies for effective water and wastewater treatment, recycling, reuse, and disposal.
- Best on-line assistance and on-site service and support.
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