Economiser for industrial heat recovery

higher efficiency, lower fuel consumption, reduced emissions

Economisers have long been central components of modern industrial heating and combustion systems. They use the residual heat contained in exhaust gases, flue gases and other exhaust air streams to preheat thermal oil, boiler feed water or other operating and working media. This sometimes significantly increases the overall efficiency of the plant, while at the same time reducing fuel consumption and thus operating costs and emissions. CAW develops robust economisers for demanding industrial applications – designed for high gas temperatures, aggressive media and long operating times.

Our economisers are individually adapted to the respective heating, combustion and process plant and can be integrated into new buildings as well as retrofitted into existing systems.

How does an economiser work?

An economiser is a heat exchanger that utilises as much of the residual heat as possible, primarily from exhaust gas flows from combustion, incineration or exhaust air flows from other process and production plants, in order to preheat another medium. Heat transfer takes place indirectly and without mixing the primary and secondary media.

Structure and process steps

Exhaust air/exhaust gas side: Depending on their quantity, temperature and constituents, such as ash or fly ash, hot gases flow through or around the heating surfaces of the economiser.
Media side: At the same time, another medium such as thermal oil, boiler feed water or process air absorbs the recovered heat.
Heat transfer: The thermal energy is transferred by means of specially designed heating surfaces.
Recirculation: Depending on the energy content and temperature level, the recovered energy is fed back into the heating/combustion system or the downstream process.

Technical features of the CAW economiser

Designed for a wide range of exhaust gas temperatures and varying loads.
High heat transfer performance combined with a compact design.
Material selection tailored to media temperatures, exhaust gas/exhaust air compositions, corrosion tendency and degree of contamination.
Low pressure losses on both media sides.
Design as smooth tube or finned tube heating bundle or as special heat exchanger.

Where are economisers used?

Economisers are used wherever exhaust gas flows with corresponding temperatures and economically usable heat potential occur and have not been utilised to date. CAW integrates economisers precisely into a wide variety of plant concepts.

Typische Anlagentypen und Einsatzumgebungen

Steam boiler systems

Preheating of boiler feed water to reduce fuel consumption.

Thermal oil systems

Recovery of exhaust heat to support oil heating by raising the return temperature.

TRO systems

Heat recovery from thermal exhaust air purification.

Waste heat recovery systems

Integration into complex heat recovery concepts.

Einsatz als Bestandteil effizienter Energiesysteme

Increase in the overall efficiency of existing plants.
Reduction in fuel consumption and operating costs.
Reduction of CO₂ and other pollutant emissions.
As a central steam source for several production areas.
Improved cost-effectiveness thanks to short payback periods.

Industries in which economisers are used

Economisers can be used across all sectors and are particularly suitable for industries with continuous combustion or high-temperature processes.

Typical industries

Energy and power plant industry

Chemical and petrochemical industry

Wood and wood-based materials industry

Paper and pulp industry

Food and agricultural industry

Building materials and cement industry

General mechanical and process engineering plant construction

Environmental and other chemical and biological process engineering

Typical applications

Preheating of boiler feed water in steam boiler systems
Waste heat recovery from combustion and TRO systems
Generation of warm or hot water from exhaust gases
Support for thermal oil and process heating systems
Optimisation of existing energy and heating concepts

Telephone	+49 6222 5726-0
Fax	+49 6222 5726-10
Email	sales@caw-wiesloch.de