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Seawater FGD (Flue Gas Desulphurization)
ANDRITZ offers seawater flue gas desulphurization with low operating and maintenance cost for coastal regions.
Based on extensive experience with limestone FGD since 1995, we developed a seawater flue gas desulphurization process for use in power plants in coastal areas by taking full advantage of the cooling water circuit downstream of the condenser.
Ideal solution for coastal plant
ANDRITZ´s seawater FGD system is able to work without additional absorbent, and there are no by-products or waste created that need further treatment or disposal. Raw flue gas enters the scrubber and is cleaned in counter-current by seawater.
The principle applied here is similar to the limestone process. Depending on the application ANDRITZ offers an FGD scrubber based on the well proven open spray tower technology, combined with an FGDplus system. In addition, ANDRITZ also has experience with a packed tower design for seawater FGD systems. These systems are beneficial in optimizing the plant’s footprint and efficiency at high SO2 inlet concentrations.
Wise principle
The principle of our process is to make use of the natural alkalinity of seawater instead of using limestone solution to absorb acidic substances in the flue gas. The SO2 is first converted into sulphite. Then the sulphite is oxidated to form sulphate in the CFD-optimized aeration basin in order to maintain the pH, raise the DO (dissolved oxygen), and reduce the COD (Chemical Oxygen Demand). In the meantime, CO2 formed by the neutralization reaction is stripped by aeration membranes, and the pH value is increased consequently to meet legal requirements.
Key features
- Outstanding for various fuels (lignite, hard coal, oil, and biomass)
- Up to 99% SO2 removal
- No by-products
- Seawater as absorbent
- Open spray tower technology and packed tower design
- Low operating and maintenance costs
- High availability
- Options for materials of construction (high-alloy carbon steel with
- rubber lining, concrete with PP-lining, glass fiber reinforced plastics)
Related links
Combined/multi-stage flue gas cleaning systems
ANDRITZ provides you with a full range of efficient combined/multistage technologies to simultaneously reduce your SOx, mercury, other heavy metals and Particulate Matter (PM) emissions.
Combined/multi-stage flue gas cleaning systems
ANDRITZ provides you with a full range of efficient combined/multistage technologies to simultaneously reduce your SOx, mercury, other heavy metals and Particulate Matter (PM) emissions.
Wet flue gas cleaning, limestone FGD
Limestone flue gas desulphurization (FGD) units are well-proven and cost-effective. ANDRITZ provides novel scrubber system (FGDplus) that maximizes SO2 and dust removal while keeping energy inputs to a minimum.
Dry flue gas treatment
ANDRITZ dry flue gas cleaning systems meet the requirements for complying with the world’s strictest emissions legislation, the desire for low consumption of additives, the need for minimal residues, and the installation simplicity of a compact design.
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Mercury control / Heavy metals
Holistic approach to minimize mercury emissions throughout the process chain. Of the several processes for removing mercury from the emissions of coal-fired power stations, the most preferred are those that have synergy with existing clean air technologies equipment.
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Steam and power generation, Proven solutions for biomass processing, Air Pollution Control, Biomass pelleting and Power plant services - ANDRITZ provides all the power generation technologies and services you need, up to complete power islands.
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