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Flue Gas Desulphurization (FGD) System

Two techniques owned by Feida
Circulating semi-dry FGD

Lime/limestone-gypsum WFGD

Basic Principles
Circulating semi-dry method or NID Technique: Use lime (CaO) or Ca(OH)2 dry powder as desulfurizer which to be neutralized with SO2 in flue gas after assimilation. The final products in dry power state to be collected by ESP or Fabric Filter.

Lime/limestone--Gypsum Wet FGD Technique: Dust-removed flue gas uses lime or limestone milk as desulfurizer to absorb SO2, and the ultimate product is gypsum

Performance Parameters
Circulating Semi-dry FGD: Desulfurizing rate can reach more than 90% when calcium-sulfur ratio to be 1.2~1.3.

WFGD Technique: Desulfurizing rate can reach more than 95% when calcium-sulfur ratio to be ≤1.05.

Applications
For flue gas desulphurization applied for coal-fired power plants and industrial furnaces and kilns, normally circulating semi-dry method is suitable for units less than 300MW, while Lime/Limestone-Gypsum WFGD is adaptable for large-scale units.

Features
Circulating Semi-dry FGD: Compact structure, simple process, small area occupancy, low investment, low operation cost, no generation of effluent, and high cost-performance ratio. Lime / Limestone-Gypsum WFGD Technique: High desulfurizing rate, low calcium - sulfur ratio, reliable operation, and high operation cost.

Achievement
Dozens of products have been put into operation, of which circulating semi-dry FGD has the greatest performance among similar techniques in China.