Coal-Fired Power Generation

Put Precision solutions to work in your power generation operations to resolve problems and gain efficiencies.

We get your challenges.  When others are turning their backs on the coal industry, we’re doubling down to help our coal customers to keep operating efficiently, to meet growing and complex environmental regulations, and to generate power profitably. We have dozens of smarter solutions that can help you operate more reliably with lower costs.

Rotary valves should NEVER be the weakest link in your emission control and DSI environmental systems.  Precision understands the imperative of precise, reliable injection of lime, trona or activated carbon to keep these systems performing as specified. Our solutions offer longer life, efficient waste-free use of materials.

Move lignite without sticky build-up that plagues competing units.  No matter where you’re feeding lignite into your process, Precision has rotary valve and rotary feeders that feed consistently and reliably, minimizing the potential for clogs and maximizing process throughput.

Working with super abrasive pet coke? No problem!  Unique solutions and high-abrasive environments are our specialty.  Let us recommend a solution that lasts longer and requires less maintenance.

Coal-Fired Power Generation Applications

Fuel Bin Screws – Standard Fuel

REQUIREMENTS

Withdrawing dry, uniformly sized, and mildly abrasive fuel from the fuel bins and discharging into a Fuel Transfer Screw.

PRECISION SOLUTION

AR-400 or Tri-Braze multi-pitch flights for max wear resistance

Bushed-and-drilled screws with oversized shafts Custom trough designs

Custom trough designs

KEY DIFFERENTIATORS

Boiler efficiency & uptime

  • Consistent fuel movement doesn’t starve or flood
  • Outage-to-outage durability

Economically rebuildable

Low power consumption

PRECISION PRODUCT

multi-pitch screw
Multi-Pitch Screws

Fuel Bin Screws – Challenging Fuel

REQUIREMENTS

Fuel Bin Screws for oversized or low-quality fuels, the type which are often prone to rat-holing or bridging

PRECISION SOLUTION

AR-400 or Tri-Braze multi-pitch flights on a cone

Significant engineering of the cone design

Bushed-and-drilled screws with oversized shafts

KEY DIFFERENTIATORS

Boiler efficiency & uptime

  • Cone design makes hard-to-handle fuels move
  • Outage-to-outage durability

Economically rebuildable

Low power consumption

PRECISION PRODUCT

multi-pitch cone screw
Multi-Pitch Cone Screw

Fuel Transfer Screws

REQUIREMENTS

Receiving fuel from Fuel Bin Screws and conveying to the boiler.

Discharging directly into the boiler via a chute or to a Rotary Feeder which meters the fuel into the boiler.

PRECISION SOLUTION

Lengths to 36’ with flow uninterrupted by hangers

Super-C or Tri-Braze flights

Wear-resistant pipe modifications

KEY DIFFERENTIATORS

Boiler efficiency & uptime

  • Hanger-free screws feed smoothly
  • Extreme-duty; fuel is always flowing

Economically rebuildable

Low power consumption

PRECISION PRODUCT

single span screws
Single Span Extreme-Duty Screws

Rotary Feeders

REQUIREMENTS

Metering and airlock device to feed fuel into the boiler; often 2-3 feeders per boiler.

PRECISION SOLUTION

Stationary knife with helical rotor shears off oversize fuel

Upgraded barrels and drive packages

Rebuildable

KEY DIFFERENTIATORS

Adaptable to unprepared or minimally prepared fuel

Outage-to-outage durability

Compatible with many types of fuels

PRECISION PRODUCT

PMR Rotary Feeder
PMR Rotary Feeder

Boiler Feed Screws

REQUIREMENTS

Plug-feed screws installed through the boiler wall that discharge fuel directly into the 1200-1400° F combustion zone.

PRECISION SOLUTION

Cantilevered; special bearings

High-temperature stainless materials

Internal water manifold for cooling the screw

KEY DIFFERENTIATORS

Plug-feed minimizes external air induction into boiler

Can be rebuilt multiple times – reduces capital cost

PRECISION PRODUCT

water cooled screw
Water-Cooled Screw

Fly Ash Screws

REQUIREMENTS

Transporting fly ash, which is warm (250° F or less), fine, and abrasive away from the dust collector.

PRECISION SOLUTION

Full-pitch, AR-400 or Tri-Braze flights for max wear resistance

Abrasion and temperature resistant troughs

Designed for light or variable loading

KEY DIFFERENTIATORS

Minimum two-year operation before rebuilding

Low power consumption

Economically rebuildable

PRECISION PRODUCT

ash transfer screw
Ash Transfer Conveyors

Bottom Ash Screws

REQUIREMENTS

Transporting bottom ash away from the boiler; ash is pulled from the boiler by traveling grate or drag chain; bottom ash is hot (600-700° F), granular, and abrasive and may contain glass clinkers.

PRECISION SOLUTION

Full-pitch, AR-400 or Tri-Braze flights for max wear resistance

Abrasion-resistant, trough construction

Engineered to handle chunks or glass clinkers

KEY DIFFERENTIATORS

Minimum two-year operation before rebuilding

Low power consumption

Economically rebuildable

PRECISION PRODUCT

ash transfer screw
Ash Transfer Conveyors

Ash Rotary Valves

REQUIREMENTS

Both fly-ash dust collection and bottom-ash applications

PRECISION SOLUTION

Severe Duty version of the PMV-8 to PMV-12 valves

High-temperature shaft seals and bearings

Drop-through wear plates prevent build-up in the valve

KEY DIFFERENTIATORS

Adaptable to very high temperatures which are common in ash systems – particularly bottom ash

Modular design lowers maintenance costs

PRECISION PRODUCT

PMV Modular Rotary Valve
PMV Modular Rotary Valve

Rotary Valves for Pollution Control

REQUIREMENTS

Systems injecting lime, trona, sctivated carbon, fly ash, bottom ash, or other sorbent for treating flue gas discharge for SOx or NOx.

PRECISION SOLUTION

Severe Duty version of the PMV-8 or PMV-10 valves

Pneumatic line injectors

Nord inverter-duty drive motors

KEY DIFFERENTIATORS

Durability that handles lime, trona, or activated carbon

Tight tolerances minimize blowby and maintains pneumatic system performance

PRECISION PRODUCT

PMV Modular Rotary Valve
PMV Modular Rotary Valve

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