FGD Pump

Product Overview

The FGD Pump is a heavy-duty, horizontal cantilevered centrifugal slurry pump engineered specifically for wet flue gas desulfurization (FGD) systems. Built to withstand the dual-threat challenges of high abrasive crystal slurries (limestone and gypsum) and acidic chemical corrosion, this pump series delivers continuous hydraulic stability in power plants and industrial scrubber islands. It is optimized to eliminate unplanned downtime in demanding particulate-laden transport loops.

Working Conditions & Pumping Medium

Pumping Medium

Limestone slurry (pH 5-7), gypsum suspension (pH 4-6), chloride-laden scrubber effluent, and fly ash.

Solid Concentration

Up to 60% by weight (w/w).

Particle Size (d50)

Up to 1 mm (tailored hydraulic volutes prevent localized choking).

Operating Temperature

Up to 120°C (248°F).

PH Range

2.5 to 12 (acidic and highly alkaline environments).

Construction & Materials

Material selection is engineered directly against specific chemical assays and abrasion profiles of the slurry. Components are cast using certified metallurgical grades:

Component	Standard Material Options	Metallurgy / Characteristics
Impeller & Volute Liner	ASTM A532 Class III Type A (A49)	High-chrome white iron (~27% Cr with controlled Mo), delivering a surface hardness >60 HRC to resist crystal wear.
Alternative Wet End	CD4MCu / Duplex Stainless Steel	Ferritic-austenitic alloy offering high resistance to chloride stress corrosion cracking and pitting in low-pH scrubber zones.
Heavy-Duty Shaft	4140 Alloy Steel / 431 Stainless Steel	High torsional modulus minimizes shaft deflection under extreme radial loads, protecting mechanical seals.
Bearing Assembly	Spherical & Cylindrical Roller Bearings	Grease or oil-lubricated with multi-lip labyrinth seals to prevent moisture and particulate ingress in wet plant environments.

Key Performance Features & Technologies

Optimized Wide-Passage Hydraulics: Reduced peripheral impeller velocities lower impact angles, directly mitigating cutting wear against hard limestone and gypsum particles.

Hydro-Dynamic Expeller Seal: Utilizes an auxiliary back-vane impeller that generates counter-pressure during operation, preventing slurry migration along the shaft and eliminating the need for gland flush water where site resources are restricted.

Optional Dual-Cartridge Mechanical Seal: For circuits requiring zero atmospheric leakage, the flush-optimized cartridge seal design ensures internal thermal dissipation and prevents solids buildup on seal faces.

External Impeller Clearance Adjustment: A heavy-duty adjusting bolt beneath the bearing housing allows maintenance teams to reset the front liner clearance without dismantling the entire wet end, sustaining high hydraulic efficiency over time.

Back-Pull-Out Assembly: Permits removal of the complete rotating element (bearing housing, shaft, and impeller) without disturbing suction/discharge piping or motor alignment.

Applications

Coal-Fired Power Generation

Absorber recirculation loops, limestone preparation systems, and gypsum hydrocyclone feed.

Metallurgical & Sinter Plant Scrubbers

Handling sulfur dioxide (SO2) scrubbing liquors and acidic wastewater.

Chemical Processing

Effluent treatment loops dealing with high-chloride and sulfate-rich industrial waste.

Pump Configuration & Selection

Accurate pump sizing ensures optimal wear life and energy efficiency. Provide your engineering team with the following parameters for sizing and performance curve matching:

Required Flow Rate (Q) and Total Dynamic Head (HD).

Slurry Specific Gravity and W/W Concentration (%).

Particle Hardness (Mohs scale) and d50 particle distribution.

Driver Specifications: Operating voltage, frequency, and motor enclosure standard (e.g., IP55, IEEE 841).

Manufacturing & Quality Control

Foundry & Metallurgy

Spectrographic chemical composition analysis is performed on every melt before pouring. Castings undergo ultrasonic (UT) and magnetic particle (MT) testing to eliminate internal shrinkage voids.

Precision CNC Machining

Volutes and bearing frames are processed on large CNC boring mills, holding critical concentricity tolerances within +/-0.02 mm to prevent premature bearing wear.

Dynamic Balancing

Impellers are dynamically balanced to ISO 1940 Grade G2.5 standards to eliminate vibration at running speeds.

Hydrostatic Pressure Testing

Every assembled pump casing is pressure-tested at 1.5 times maximum working pressure prior to coating and shipment.

Maintenance & Spare Parts Support

Dimensional Interchangeability

Wet-end components (impellers, throat bushes, frame plate liners) match standard heavy-duty industrial footprints, allowing direct drop-in replacement in existing installations.

Condition-Based Monitoring

Integrated inspection ports and replaceable wear rings allow accurate wear tracking without full teardown.

Documentation Package

Shipments include certified material test reports (CMTR per EN 10204 3.1), balancing protocols, and comprehensive installation and maintenance manuals.

Frequently Asked Questions

Q: How do your pumps mitigate accelerated wear from gypsum and limestone crystals?

A: We utilize high-chrome white iron (ASTM A532 A49) with a hardness exceeding 60 HRC for all primary wear components. Furthermore, our hydraulic geometry is designed with low peripheral velocities, reducing particle impact velocity and extending operating intervals between overhauls.

Q: Can these pumps run reliably without an external seal water supply?

A: Yes. When configured with a hydro-dynamic expeller (centrifugal seal), the pump generates sufficient counter-pressure during running to keep slurry out of the stuffing box, completely eliminating gland flush water requirements for water-scarce or remote sites.

Q: Are the mounting dimensions fully compatible with existing plant footprints?

A: Yes. Our FGD pump casings and baseplate mounting layouts are dimensionally interchangeable with standard heavy-duty horizontal slurry pump designs, allowing seamless drop-in replacement in existing absorber skids without modifying concrete foundations or pipe spool pieces.

Q: What is the standard lead time for replacement wet-end components?

A: Common high-wear parts (impellers, volute liners, and insert plates) cast in A49 alloy are maintained in semi-finished inventory. Standard production and dispatch lead times range from 2 to 4 weeks depending on alloy specifications and order quantity.

Q: What quality and material certifications are provided with the delivery?

A: Every pump is delivered with a complete quality assurance documentation package containing EN 10204 3.1 raw material metallurgical certificates, hydrostatic test logs, dimensional inspection sheets, and factory compliance records.

Q: How is shaft deflection controlled to protect mechanical seals in high-head applications?

A: We minimize shaft deflection by optimizing the overhang ratio (the ratio of shaft extension to bearing span) and utilizing high-tensile alloy steel shafts. This limits maximum radial deflection at the seal face to under 0.05 mm at maximum load, ensuring prolonged mechanical seal service life.

Shijiazhuang Ruite Pump Co., Ltd. is one of the most experienced FGD pump manufacturers and suppliers in China. Please rest assured to wholesale high quality FGD pump made in China here from our factory. For price consultation, contact us.

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