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
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
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
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
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
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
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 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
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
