Pulp & Paper
Heat Recovery
Black liquor recovery, paper machine exhaust heat capture, and boiler economisers.
Heat exchangers engineered for pulp and paper — recovering waste heat from recovery boilers, paper machines, and process steam systems. SS 304L construction across 250–3,500 kW with counterflow design for maximum efficiency.
Three Models,
One Solution
Recovery boiler economiser for pulp and paper mills — recovers waste heat from black liquor combustion exhaust and bark boiler flue gases to preheat feedwater.
High-capacity plate heat exchanger for pulp washing heat recovery, white water heat reclamation, and process-to-process heat integration in paper manufacturing at up to 3,500 kW.
Air-to-air heat recovery from paper machine hood exhaust, dryer section ventilation, and coating oven discharge. Reduces steam demand for air heating in the machine hall.
Pulp & Paper
Applications
Select an application to explore heat recovery solutions for your pulp and paper mill.
Recovery boilers in Kraft pulp mills discharge flue gases at 180–300°C after the economiser section — still carrying significant recoverable energy. Our ThermStack TSE economisers provide additional heat recovery stages, preheating boiler feedwater or process water. For larger installations, EcoStream EST shell and tube exchangers handle 2,000–3,500 kW of flue gas heat recovery. SS 304L construction resists the corrosive particulates and condensates from black liquor combustion.
Corrosion Proof
SS 304L handles black liquor combustion products
Humidity Tolerant
Designed for saturated hood exhaust streams
Self-Cleaning
Condensate drainage prevents fouling buildup
Compact Install
Fits existing boiler houses and machine halls
Built for
Pulp & Paper
Key advantages for pulp and paper mill applications.
Boiler Economising
Purpose-built for recovery boiler flue gas economising — extracts residual heat from black liquor combustion exhaust at 180-300°C.
Feedwater Preheating
Preheats boiler feedwater using waste flue gas energy, reducing steam generation fuel costs across the mill.
Bark Boiler Ready
Handles the high particulate loading and variable combustion conditions of bark and biomass boilers.
Dual Mounting
Horizontal or vertical installation fits tight boiler house layouts without major structural modifications.
Condensate Resistant
SS 304L tubes withstand acidic condensates that form when flue gases cool below the dewpoint.
Modular Staging
Multiple TSE units can be staged in series for deeper heat recovery from high-temperature exhaust streams.
Recovers Heat
Across Your Mill
Corrosion-resistant design for paper mill environments — handles black liquor, white water, and process steam conditions.
Your Mill Runs on Heat.
Stop Losing It.
Pulp and paper manufacturing is one of the most energy-intensive industries. From digester blowdown to dryer exhaust, your mill exhausts enormous quantities of recoverable thermal energy. Our shell and tube heat exchangers capture this waste heat for feedwater preheating, white water heating, or process stream recovery — withstanding the corrosive conditions unique to paper mills.
Recover waste heat from black liquor, blowdown, and exhaust systems — reducing steam and fuel costs across the mill.
SS 304L/316L construction withstands the acidic, high-humidity conditions in pulp and paper mill environments.
Removable end covers and cleanable tube bundles for easy maintenance — minimising fouling-related efficiency losses.
Removable end covers and cleanable tube bundles for easy maintenance — minimising fouling-related efficiency losses.
Pulp &
Paper FAQs
Common questions about heat recovery for pulp and paper mills.
The ThermStack TSE (445–800 kW) for smaller recovery boilers or additional economiser stages. The EcoStream EST (2,000–3,500 kW) for large Kraft mill recovery boilers. Both use SS 304L to resist the corrosive flue gas conditions from black liquor combustion.
Our EnerAir EAA air-to-air exchangers reduce dryer section steam demand by 10–20% by recovering heat from hood exhaust to preheat incoming air. For a paper machine consuming 20 tonnes/hour of steam, this represents 2–4 tonnes/hour steam savings — significant cost and CO₂ reduction.
Yes. White water at 40–60°C is an excellent low-grade heat source. Our EcoStream EST shell and tube exchangers recover this heat for fresh water preheating, chemical preparation, or boiler feedwater. Large water volumes mean meaningful energy recovery even from modest temperature reductions.
Shell and tube design with removable end covers allows mechanical cleaning of tubes. We design with appropriate fouling factors for paper mill streams. For fibre-laden streams, we specify increased tube diameters and straight-through designs to minimise blockage risk.
We design for installation during planned maintenance shutdowns. Pre-fabricated connections and fully assembled units minimise tie-in time. Most installations need only 2–3 days for connection during a scheduled shutdown. We provide detailed installation engineering including structural loading and pipe routing.
Maintenance intervals depend on the application. Recovery boiler economisers: 6–12 monthly inspection. Hood exhaust exchangers: annual filter/screen cleaning. Process water exchangers: 12–24 monthly inspection depending on water quality. All units have removable covers for tube access.
Ready to
Recover?
Our engineering team has extensive experience in pulp and paper heat recovery. Share your mill details.
- Recovery boiler economisers
- Paper machine hood recovery
- Process water heat capture
- Mill energy surveys