Industry Overview
Flue Gas Desulfurization (FGD) and chemical desulfurization systems operate in one of the most corrosive and abrasive environments in process industry. The combination of acidic slurry (pH 3-6), high chloride content from coal-derived HCl, gypsum and limestone slurry abrasion, and temperature gradients creates a unique challenge for every wetted surface. Each FGD component — absorber tanks, slurry pumps, piping, and dewatering equipment — faces the combined attack of chemical corrosion and mechanical abrasion simultaneously.
Zhili provides specialized materials for FGD systems: UHMWPE linings for absorber tanks, rubber compounds for slurry handling, nickel-based hardfacing for pump components, and low-chromium alloys for limestone grinding. Our solutions are proven across wet limestone, semi-dry spray dryer, and sodium-based desulfurization processes in power plants, steel mills, and chemical facilities worldwide.
Related Products for FGD Systems
UHMWPE Liner Plates for Absorbers
Ultra-high-molecular-weight polyethylene absorber tank linings, spray shields, and nozzle liners. Zero chemical absorption, 10× better wear resistance than steel, inert to pH 1-14.
Rubber Linings for Slurry Handling
Natural rubber and butyl rubber linings for limestone slurry pipes, pump casings, and absorber internals. Formulated for FGD chemistry — acid-resistant, chloride-resistant.
Grinding Media Balls for Limestone
Low-chromium cast iron grinding balls for wet limestone ball mills. Optimized corrosion-wear balance for acidic FGD slurry environments.
Slurry Pump Impellers & Casings
Rubber-lined or Ni-based hardfaced slurry pump components for limestone-gypsum slurry transport. Designed for high-flow, high-abrasion FGD slurry service.
Hardfacing Wire for Rebuilding
Nickel-based flux-cored hardfacing wires for rebuilding worn FGD slurry pump impellers, fan blades, and valve seats in-situ.
Gypsum Dewatering Components
Stainless steel (316L) and polyurethane components for gypsum thickening and dewatering. Optimized slot geometry for maximum dewatering rate.
Core Material System for FGD Desulfurization
The premium lining material for FGD absorber tanks, slurry pipes, and hoppers. Molecular weight 3-6 million g/mol provides exceptional abrasion resistance (10x better than steel), near-zero water absorption, and complete chemical inertness to acidic FGD slurries including chloride and sulfate solutions. Service life exceeds 15 years in FGD absorber service.
| Density | 0.93 g/cm3 |
| Wear Resistance | 10x better than carbon steel |
| Chemical Resistance | Inert pH 1-14, chlorides, sulfates |
| Operating Temp | 5-60C (FGD range) |
| Application | Absorber tank linings, slurry pipes, nozzles |
For FGD slurry pump impellers, pipe bends, and tank linings, natural rubber and synthetic rubber compounds provide excellent abrasion resistance with good chemical resistance. Zhili formulates compounds specifically for FGD chemistry — high chloride content, acidic pH, and temperature cycling from ambient to 60C. Butyl rubber is preferred for absorber linings due to superior H2SO4 and HCl resistance.
| Compound Options | NR, SBR, EPDM, Butyl, Neoprene |
| Shore Hardness | 60-70 Shore A |
| Abrasion Resistance | 3-5x better than carbon steel |
| Max Temp | +80C continuous / +100C intermittent |
| Application | Pump impellers, pipe linings, absorber internals |
For limestone grinding in FGD ball mills, standard high-chromium alloys suffer galvanic corrosion in acidic slurry. Zhili's LC-FGD alloy (2-3% Cr, optimized C content) provides the right balance of corrosion resistance (Cr2O3 passive layer) and abrasion resistance for wet limestone grinding.
| Grade | LC-FGD (Zhili Proprietary) |
| Hardness | HRC 45-55 |
| Corrosion Rate | <0.1 mm/year in FGD slurry |
| vs. Standard HCrCI | 10x lower corrosion rate |
| Application | Grinding balls, mill liners for limestone mills |
For slurry pump volutes, impeller leading edges, and fan blades, NiCrBSi (Colmonoy-type) hardfacing overlays applied by PTA or oxy-acetylene welding provide excellent resistance to combined corrosive-abrasive wear in high-chloride FGD environments.
| Overlay Alloys | NiCrBSi (Colmonoy 6/12/88), Ni-B-Si |
| Surface Hardness | HRC 45-65 (selectable) |
| Corrosion Resistance | Excellent in chloride FGD slurry |
| Application | Pump impellers, fan blades, valve seats |
Typical Application Scenarios
Wet FGD Absorber Tower
Limestone-gypsum slurry absorbs SO2 at pH 5-6. Tank walls, spray headers, and mist eliminators face slurry droplet impact abrasion and chemical corrosion. UHMWPE or rubber linings are the standard solution.
UHMWPE / Butyl Rubber LiningLimestone Grinding & Slurry Prep
Wet ball milling of limestone to 90% <75um for slurry preparation. Grinding media and mill liners face three-body abrasion from angular limestone in acidic slurry (pH 4-5).
LC-FGD Grinding Balls & LinersSlurry Pumps & Pipe Systems
Limestone and gypsum slurry pumps at high flow rates (500-2000 m3/h). Pump impellers and volutes experience severe slurry abrasion — rubber-lined or Ni-based hardfaced components are optimal.
Rubber-Lined Pump / Ni OverlayGypsum Dewatering & Handling
Gypsum slurry dewatering in centrifuges and belt filters. 316L stainless steel or polyurethane components resist gypsum crystal abrasion and residual chloride from wash water.
316L SS / PolyurethaneID Fan & Flue Gas Duct
Wet, acidic flue gas handling at 50-80C with fine gypsum and fly ash particulate. Fan blades require erosion resistance plus corrosion protection — stainless steel or Ni-based alloy overlays.
SS 316L / Ni Overlay Fan BladesSemi-Dry Spray Dryer Absorber
Rotary atomizer and absorber vessel in semi-dry FGD. Lime/limestone slurry spray-dried at 150-200C. Vessel walls and atomizer components face corrosive gas attack and abrasive particulate erosion.
SS 310S / Erosion CoatingSuccessful Cases
Absorber Tank Linings — 2x660 MW Units
Limestone Grinding Balls — 500 MW FGD
Slurry Pump Rebuilding — Sintering FGD
Slurry Pipe Linings — Sulfuric Acid Desulfurization
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