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Fly ash handling systems

Fly ash from economizer or air heater hoppers and particulate collection systems

Allen‑Sherman‑Hoff fly ash systems provide a reliable, low‑maintenance, and cost‑efficient solution for conveying and collecting fly ash from boilers and emissions control equipment.

Managing fly ash efficiently is essential for maintaining boiler performance, meeting environmental goals, and ensuring reliable plant operation. Leveraging over 100 years of Allen‑Sherman‑Hoff expertise, now as part of ANDRITZ, we support customers with solutions tailored to the flow characteristics, abrasiveness, and behavior of various fly ash materials. Our systems are designed to help operators transport ash safely, minimize maintenance demands, and achieve predictable, trouble‑free handling from collection through discharge.

Allen‑Sherman‑Hoff (A-S-H) LLC

About us

Four basic types of pneumatic transport systems and associated components are available, selected according to the requirements of each specific application.

Fly ash systems

Pugmill recycler

Provides an economical way to recycle FGD water in the fly ash which is sent to the landfill for disposal
Minimizes fugitive dust during operation by using flexible isolation curtains
Optimal mix to avoid unabsorbed water in transport vehicle
Overlapping paddle configuration minimizes ash buildup
Nozzles specifically target mixing area with fine mist of water
Easy access for routine maintenance
Water meter and valve for precise water flow control

Vacuum System

Uses air as transport media below atmospheric pressure to entrain and convey material
Vacuum source is located at the discharge end of the conveying system
Ideal for shorter transport distances (< 1500 ft)
Safest design for indoor and hazardous environments
Uses fewer components
Less clearance required under hoppers
Low initial system cost

Vacuum/Pressure combination System

Used for long conveying distances where vacuum system benefits are desirable in confined or hazardous locations, then transfer to pressure system for long distance
Initial material discharge from hoppers is by a vacuum system
Requires an intermediate collection vessel/transfer station
Pressurized conveyance system to storage silo

Pressure System

Can convey over longer distances (1,000 to 10,000 ft)
Simpler ash/air separation equipment at the storage silo
Airlock is required to transfer material from collecting hoppers to high pressure conveying line
Lower cost silos and related equipment
Lower operating costs
Eductor-based pneumatic system available for special applications

Dense-phase transport system

Variation of pressurized system but operates at higher ash-to-air ratios
Smaller transport line sizes, for intermediate material transport rates, will often be the lowest initial and operating cost system
Long distance conveyance, same capabilities as pressure transport systems

Allen-Sherman-Hoff

Material handling for power and process industries

Ash handling replacement parts and performance upgrades

ANDRITZ supplies high‑performance parts and upgrades for Allen‑Sherman‑Hoff ash handling systems and most other major brands. We maintain inventory for a wide range of critical components to ensure fast delivery when you need it.

Biomass handling systems

Proven solutions of biomass processing systems for the renewable energy industry.

Bottom and fly ash handling systems

Complete solutions for biomass boiler ash handling

Allen-Sherman-Hoff remote submerged chain conveyor

Bottom ash handling systems

Bottom ash from the combustion of solid fuels

Fly ash handling systems

Fly ash from economizer or air heater hoppers and particulate collection systems

Allen-Sherman-Hoff submerged grind conveyor

Submerged grind conveyor system

The Submerged Grind Conveyor (SGC) System offers maximized results and minimized modifications to the existing footprint.

BFB EcoFluid boiler at E.ON Blackburn Meadows Renewable Energy Plant, UK

Thermal power

Turbo generators for thermal power plants, power generation systems for the efficient use of traditional fossil fuels as well as biomass, process gases, black liquor, and refuse-derived fuels.