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Corrosion and fouling problems limit the recovery of more heat. With polymer heat exchangers you can recover additional heat and overcome these issues.
Finding a technically feasible solution to recover and reuse waste heat is a challenge.
When burning biogas from anaerobic waste water treatment or biomass, the flue gases are corrosive and fouling.
When hot flue gas and exhaust air leave the stack, they still contain a significant amount of energy. Our heat recovery system captures this heat from dryers, steam boilers, CHP systems, RTO’s and incinerators.
Drying air, combustion air, process water, make-up water or boiler feed water are heated with the captured waste heat. This directly reduces the consumption of fossil fuels.
Warm up combustion air or drying air by extracting heat from flue gas or exhaust air. The air preheater is corrosion resistant, easy to maintain and to clean.
Warm up boiler feed water, make-up water or process water with waste heat from flue gases or exhaust air. The economiser is corrosion resistant and is easy to maintain and to clean.
This paper manufacturer has the ambition to make their production processes more sustainable. Their steam boiler is being co-fired with biogas. Currently, heat recovery from the flue gas of this boiler is limited due to the potentially corrosive nature of the flue gas.
Conventional metal air preheaters are not suitable for deep cooling of flue gas because the acids in the flue gas will condense. A case study was prepared for the combination of a metal and polymer air preheater system. With this system, flue gas will be cooled down through the acid dew point to preheat the combustion air.
Combustion air will be preheated from 25 to 179 °C. The polymer air preheater part in the installed combination will make sure that there are no corrosion issues.
A proposal is made that shows all technical details and an economic assessment with payback time. You have everything you need for approval to start a feasibility study.
We or your preferred engineering company can perform a feasibility study to create the budget estimate you need to get management approval for CAPEX.
In a Paper & Pulp plant, a number of thermal processes are in operation, such as steam boilers, CHP installations, Dryers, RTO's and incinerators. On these thermal processes high grade heat is lost through the stack via hot flue gas or dryer exhaust air. This can be as much as 15% of the primary energy usage. By recovering the heat from flue gas to preheat combustion or drying air, a significant reduction in energy and CO2 emissions can be achieved. Alternatively, the waste heat can be used to warm up boiler feed or process water.
Making the thermal processes more efficient reduces fuel consumption and therefore lowers fuel costs. Making the heat recovery system resistant to corrosion and fouling enables the mill to recover additional heat from their flue gas or dryer air, which will result in operational cost savings. Clients have improved their efficiency by 5 to 10% and achieved payback times of 3 to 5 years. Request a free Technical Assessment to get insight in your saving opportunities.