Economisers & Flue Gas Coolers

Economisers and flue gas coolers enable the waste heat generated by boilers and other industrial processes to be captured and reused for a range of applications. This results in improved efficiency, reduced fuel consumption, and lower emissions and operating costs.

We design and fabricate economisers in our factory in Wakefield where we’ve been manufacturing since 1845, when our founder Edward Green invented the world’s first economiser. All of our products are bespoke to meet our customers’ specific needs and operational requirements.

Overview

Economisers in steam power plants recover waste heat from boiler flue gas and transfer it to the boiler feedwater. This increases feedwater temperature and reduces the energy required to achieve the boiler’s rated output.

Flue gas coolers perform a similar function, although the heated water is used for other plant applications rather than being evaporated in the boiler. This supports additional heat recovery and improves overall plant efficiency.

To minimise corrosion and ensure long-term reliability, our designs incorporate carefully selected materials suited to demanding operating conditions. Careful material selection helps maintain durability and performance over time.

Global Expertise

With over 175 years of experience in designing and manufacturing economisers, Green’s brings unmatched expertise to every project.

We have supplied economisers to clients all over the world, delivering solutions that maximise energy recovery, improve efficiency, and meet the specific needs of each facility.

Our team combines deep engineering knowledge with rigorous testing and quality standards to ensure reliable, long-term performance.

Specifications

These units are designed for easy installation using mobile cranes and are typically constructed to EN or ASME standards with the following specifications:

Water Pressure: 10–320 bar
Water Flowrate: 10–2800 t/h
Thermal Duty: 1–100 MW
Tube Length: Up to 20m
Module Size (WxLxH): From 1m x 3m x 1m to 6m x 20m x 4m
Module Weight: 15–150 tonnes

We design and manufacture economisers and flue gas coolers as fully assembled units, including casings and headers, tailored for seamless integration into new-build projects.

Coils

Our team can design and manufacture replacement coils with customised tube pitch and fin configurations, ensuring full compatibility with existing casings and minimal disruption during installation.

These solutions are typically required when tubes need replacement due to failure or when a redesign is needed to improve performance and heat recovery.

We supply both single and double economiser coils, designed for seamless installation into existing casings on-site.

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