ExergyASD® for flexible waste‑heat drying
Dry low to medium‑moisture solid materials efficiently using low‑temperature waste heat, reducing energy consumption and process emissions while delivering reliable, low‑carbon drying performance across a wide range of industrial applications.
Dry solid materials efficiently with low‑temperature waste heat, cut energy use and emissions, and achieve reliable low‑carbon drying across a wide range of industrial applications.
High‑performance drying with ExergyASD®
The ExergyASD® is an indirect air‑stream dryer designed for continuous drying of bulk solids, fibrous materials, and granules using clean, low‑temperature air heated by waste heat. Its closed heat‑exchanger system keeps flue gases and contaminants separate from the product, ensuring gentle temperature control, stable operation, and high product quality.
Reliable for flexible waste‑heat integration
Offering flexible and efficient drying for materials such as biomass, sludge, food and feed ingredients, and industrial by‑products, the ExergyASD® enables industries to maximize available waste heat. Proven in sectors like biomass, pulp and paper, food and feed, and waste treatment, it delivers reliable performance even in processes with low‑grade heat sources that conventional dryers can’t use effectively.
With its compact layout, few rotating parts, and robust design, the system provides high availability, low maintenance needs, and easy integration into existing process lines while maintaining consistent drying performance over long operating periods.
Wet feed enters the system through an air‑lock, which maintains pressure and limits air leakage. Inside, the product meets a stream of hot, clean air that both dries and transports it through custom ducts.
As the product moves, moisture evaporates. Drying time is controlled by air speed, duct length, and system configuration. At the outlet:
- A high‑efficiency cyclone or separator removes the dried material
- Dry product is discharged via an air‑lock for further handling
- Part of the air is recirculated to save energy and stabilize the process
The air is indirectly heated with available low‑temperature waste heat, keeping combustion gases separate. For sticky or demanding materials, optional features include pre‑drying, staged feeding, or product recirculation to ensure smooth, stable operation.
The ExergyASD® continuously dries biomass, sludge, food and feed ingredients, agro residues, and industrial by‑products in a controlled air stream with gentle temperature profiles.
Key advantages include:
- Safe and efficient operation with low risk of overheating
- Low product hold‑up, ensuring stable and clean processing
- Use of low‑temperature waste heat, cutting fuel use and CO₂ emissions
Depending on the heat source, a large share of waste heat can be recovered. Typical sources include low‑pressure steam, flue gas via heat exchangers, and hot water loops.
Drying with clean, indirectly heated air enhances product quality and minimizes contamination risk. Controlled air temperature and residence time help preserve color and structure
Further benefits include:
- Quick start‑up and shutdown thanks to limited product volume
- Reduced corrosion and fouling
- Lower dust and odor emissions than conventional hot‑gas dryers
- Flexible operation across a wide load range
- Easy maintenance with excellent access to key components
The ExergyASD® is suitable for a wide range of free‑flowing bulk solids, fibrous materials and granules that can be conveyed in an air stream. Typical application areas include:
- Biomass and biofuels: wood fibers, wood chips, bark, agro biomass, pellets and briquette feedstock
- Pulp and paper: fibrous residues and side streams suitable for air drying
- Food and feed side streams: selected high‑moisture ingredients that can be air‑conveyed
- Sludge and industrial by‑products: dewatered sludges, filter cakes and other materials that can be transported in an air stream
For high‑moisture or challenging products, the ExergyASD® can be combined with the ExergyPSSD® Superheated Steam Dryer in a two‑stage configuration. The steam generated in the first stage can be used to supply low‑temperature heat to the Air Stream Dryer, improving overall energy efficiency and product handling while minimizing emissions and fuel consumption.
Wet feed enters the system through an air‑lock, which maintains pressure and limits air leakage. Inside, the product meets a stream of hot, clean air that both dries and transports it through custom ducts.
As the product moves, moisture evaporates. Drying time is controlled by air speed, duct length, and system configuration. At the outlet:
- A high‑efficiency cyclone or separator removes the dried material
- Dry product is discharged via an air‑lock for further handling
- Part of the air is recirculated to save energy and stabilize the process
The air is indirectly heated with available low‑temperature waste heat, keeping combustion gases separate. For sticky or demanding materials, optional features include pre‑drying, staged feeding, or product recirculation to ensure smooth, stable operation.
The ExergyASD® continuously dries biomass, sludge, food and feed ingredients, agro residues, and industrial by‑products in a controlled air stream with gentle temperature profiles.
Key advantages include:
- Safe and efficient operation with low risk of overheating
- Low product hold‑up, ensuring stable and clean processing
- Use of low‑temperature waste heat, cutting fuel use and CO₂ emissions
Depending on the heat source, a large share of waste heat can be recovered. Typical sources include low‑pressure steam, flue gas via heat exchangers, and hot water loops.
Drying with clean, indirectly heated air enhances product quality and minimizes contamination risk. Controlled air temperature and residence time help preserve color and structure
Further benefits include:
- Quick start‑up and shutdown thanks to limited product volume
- Reduced corrosion and fouling
- Lower dust and odor emissions than conventional hot‑gas dryers
- Flexible operation across a wide load range
- Easy maintenance with excellent access to key components
The ExergyASD® is suitable for a wide range of free‑flowing bulk solids, fibrous materials and granules that can be conveyed in an air stream. Typical application areas include:
- Biomass and biofuels: wood fibers, wood chips, bark, agro biomass, pellets and briquette feedstock
- Pulp and paper: fibrous residues and side streams suitable for air drying
- Food and feed side streams: selected high‑moisture ingredients that can be air‑conveyed
- Sludge and industrial by‑products: dewatered sludges, filter cakes and other materials that can be transported in an air stream
For high‑moisture or challenging products, the ExergyASD® can be combined with the ExergyPSSD® Superheated Steam Dryer in a two‑stage configuration. The steam generated in the first stage can be used to supply low‑temperature heat to the Air Stream Dryer, improving overall energy efficiency and product handling while minimizing emissions and fuel consumption.