Waste Heat Recovery Solutions
Valuable Energy Lost to Atmosphere
Dryer exhaust air at 60–90°C vented to atmosphere represents fuel already paid for, doing nothing useful. In facilities running dryers for multiple shifts daily, this is a significant and recurring operating cost with a recoverable fraction worth assessing.
High Fuel & Utility Bills
Rising gas, diesel and electricity costs make every unit of recoverable heat more valuable. Even modest recovery rates from dryer exhaust or compressor cooling circuits can offset meaningful portions of heating fuel or hot water generation costs.
Hot Exhaust with No Reuse Pathway
Many facilities exhaust hot air from dryers and steam systems without any recovery infrastructure in place. The opportunity exists but no one has mapped it. An energy assessment identifies whether a practical use point exists close enough to justify the system.
Process Heat Imbalance
Some process stages need heat input while others exhaust heat nearby. Feed water preheating, incoming air preheating and process water heating are common use points where recovered heat directly offsets heating system load on the same site.
Hot Air Recovery System
Captures heat from dryer exhaust air streams — typically at 60–90°C — and recirculates a portion back into the dryer inlet air supply, or redirects it to preheat incoming fresh air. Reduces the heating load on the dryer burner or heat source directly, lowering fuel consumption per kg of product dried. Most applicable to fluid bed dryers and continuous drying systems operating at high run hours per day where the cumulative fuel saving justifies the heat exchanger investment.
- Fluid Bed Dryers
- Continuous Dryers
- Inlet Air Preheating
- Fuel Reduction
Hot Water Recovery System
- Process Water Heating
- Boiler Feed Preheating
- Facility Heating
- CIP Water
Thermal Oil Recovery System
- High-Temperature Applications
- Jacketed Equipment
- Process Heating
- Stable Temperature
Low-Pressure Steam Recovery
Recovers heat from boiler flue gas or steam condensate to generate low-pressure steam for facility use — space heating, cleaning, sterilization pre-conditioning or process heating. Condensate recovery reduces both water consumption and boiler fuel simultaneously. Most applicable in facilities with existing steam boiler systems where flue temperatures are high and condensate return rates are low. Boiler system survey required as part of assessment.
- Boiler Flue Gas
- Condensate Recovery
- Space & Process Heating
- Steam Facilities
Exhaust Source
Dryer vs Boiler vs Compressor
Dryer exhaust air suits hot air or hot water recovery. Boiler flue gas suits economiser or LP steam recovery. Compressor cooling circuits suit hot water recovery where demand exists.
Use-Point Form
Air, Water or Oil Circuit
The recovered energy form — hot air, hot water or thermal oil — is determined by what the use-point requires. Matching these correctly is critical to system efficiency.
Temperature Level
Low, Medium or High Grade Heat
Dryer exhaust at 60–90°C is low-grade and suits water or air preheating. Boiler flue at 150–250°C is medium-grade and suits LP steam generation or thermal oil recovery.
Operation Mode
Continuous vs Batch
Continuous processes with steady exhaust streams offer more predictable recovery than batch operations where heat availability is intermittent and thermal storage may be needed.
Quick Reference: Solution Summary
Use this as a starting point — engineering review required before final selection
| Parameter | Details |
|---|---|
| Hot Air Recovery | Dryer exhaust at 60–90°C — inlet air preheating, fuel reduction on drying systems |
| Hot Water Recovery | Process water heating, boiler feed preheating, CIP water, facility heating from exhaust |
| Thermal Oil Recovery | High-temperature use-points, jacketed equipment, process heating above hot water range |
| LP Steam Recovery | 10 kg/hr pilot to 5000 kg/hr production scale |
| Viable Sources | Dryer exhaust, process hot air, compressor cooling, boiler flue gas, steam condensate |
| Assessment First | Temperature survey, flow measurement, use-point mapping and ROI calculation required |
| Next Step | Submit facility details for an energy assessment review |
Pulverizing & Milling
Controlled particle size reduction from coarse grinding to fine and ultrafine powder.
Mixing & Blending
Uniform distribution of powders, granules, spices and specialty formulations.
Drying & Cooling
Moisture reduction, stabilisation and temperature conditioning for free-flowing powders.
De-Dusting & Filtration
Dust capture, product recovery and cleaner work environments for powder lines.
Material Handling & Conveying
Enclosed, hygienic transfer of powders and granules between process stages.
Pasteurization & Sterilization
Natural steam HT-ST microbial control for spices, herbs, seeds and regulated ingredients.
Granulation & Cutting
Controlled cutting and flaking for fibrous, tough and irregular materials.
Weighing & Batching
Accurate dosing, recipe control and batch traceability for multi-ingredient production.