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FGD / Desulfurization Systems

Limestone slurry preparation, absorber mixing and gypsum crystallization systems for flue gas desulfurization. Combined abrasion and corrosion resistance with 24/7 continuous operation.

200 kW
Motor Power
30%
Solids Concentration
24/7
Continuous Operation
ISO 14001
Environmental Compliance
Flue gas desulfurization unit at a thermal power plant
GENEL BAKIŞ

About FGD / Desulfurization Systems

Flue Gas Desulfurization (FGD) is a wet scrubbing process used to capture SO₂ from the flue gas of coal-fired thermal power plants, cement plants and smelters. Limestone slurry contacts the flue gas in the absorber tower to form CaSO₃/CaSO₄, which is then crystallized as gypsum. Mechanimix designs the mixing systems needed in all three key tanks — slurry preparation, absorber and gypsum — end to end.

Combined Abrasion + Corrosion Resistance

Super Duplex or Cr₂₇ impellers with rubber-lined tanks to withstand the combination of low pH, high solids content and chloride ions.

HWM-B Wide-Blade Impeller

Guarantees solids suspension with low power consumption in high-viscosity, dense-slurry environments.

Continuous-Duty Design

Bearings, seals and gearboxes specified for MTBF > 40,000 hours to support 24/7 operation without redundancy.

Limestone Dosing Control

pH feedback closed-loop dosing stabilizes SO₂ capture efficiency at 95%+.

Gypsum Crystallization Management

Controlled supersaturation and residence time produce marketable-grade gypsum (CaSO₄·2H₂O > 95%).

Low Energy Consumption

Tank geometry and baffle configuration optimized with CFD; kW/m³ below industry average.

SİSTEM BİLEŞENLERİ

System Components

This system consists of integrated components selected from MechaniMix's product portfolio.

UYGULAMA ALANLARI

Uygulama Alanları

Coal-Fired Power Plants

SO₂ capture from flue gas in 500–1,200 MW units; compliance with European and Turkish emission regulations.

Cement Plants

SO₂ reduction from clinker kiln flue gases; compliance with CemBureau criteria.

Metal Smelters

Scrubbing of SO₂-rich gases in copper, zinc and lead smelters.

Gypsum Recovery

Producing FGD gypsum at marketable grade for the cement and drywall sectors.

TEKNİK ÖZELLİKLER

Teknik Özellikler

ÖzellikDeğer
Tank Capacity50 – 2,000 m³
Motor Power30 – 200 kW
Solids Concentration15% – 30% (by weight)
MaterialSuper Duplex / Cr₂₇ impeller + rubber-lined tank
Operating pH4.5 – 6.5 (absorber), 8–10 (limestone)
Temperature45 – 65 °C
MTBF Target> 40,000 hours (continuous operation)
Emission ComplianceIED / MCP Directive, ISO 14001
NEDEN MECHANIMIX

Why Mechanimix?

Power + Cement Sector References

Slurry mixing experience in thermal power plants and cement works; uninterrupted availability of critical equipment.

Combined Wear-Corrosion Design

FGD service is both abrasive and corrosive; Mechanimix provides a material recipe that addresses both mechanisms together.

Low OPEX Guarantee

Optimized impeller design reduces energy consumption; committed spare-parts stock makes planned maintenance predictable.

24/7 Operational Assurance

Fast on-site response and in-stock seals and impellers keep annual downtime below 8 hours.

SIKÇA SORULAN SORULAR

Sıkça Sorulan Sorular

Why is mixing critical in an FGD process?+
In the absorber tank, keeping limestone particles suspended directly drives SO₂ absorption efficiency — if particles settle, the reactive surface area drops and capture rate falls. Homogeneous mixing also controls gypsum crystal size, securing marketable byproduct quality.
Why is the HWM-B impeller recommended?+
FGD absorber tanks can reach 30% solids with elevated viscosity, where a standard HWM impeller becomes insufficient. The wide-blade geometry of the HWM-B generates higher flow and achieves the just-suspended condition at lower speed, cutting energy consumption.
How is the slurry tank sized?+
Hourly limestone consumption is calculated from flue gas flow and SO₂ concentration. Typical residence times are 4–6 h for the absorber, 2–3 h for slurry preparation and 2 h for the gypsum tank. Tank H/D ratio is kept between 1.0 and 1.3.
How are abrasion and corrosion managed simultaneously?+
Cr₂₇ high-chromium iron is excellent against abrasion but limited in corrosion resistance; Super Duplex is strong against corrosion but not as abrasion-resistant as Cr₂₇. In FGD, impeller blades get Cr₂₇ or polyurethane coating, the hub uses Super Duplex, and the tank is protected by a rubber liner.
How is gypsum crystallization controlled?+
Supersaturation level, residence time and mixing intensity are controlled to target a typical crystal size of 40–60 µm. Over-agitation breaks crystals while under-agitation yields coarse, irregular ones; CFD is used to determine the optimum tip speed.

Projeniz İçin Ücretsiz CFD Analizi

Proses ihtiyaçlarınıza en uygun sistem konfigürasyonu için mühendislik ekibimizle görüşün. İlk değerlendirme ve ön fizibilite ücretsizdir.

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