Economizer to Preheat Feedwater for Heat Recovery Boiler Systems

In industrial heat recovery boiler and HRSG systems, a large amount of low-grade waste heat is carried away by tail flue gas during operation. Without effective recovery, this residual heat is directly discharged into the atmosphere, resulting in energy loss and increased boiler fuel consumption. The economizer for heat recovery boiler feedwater preheating acts as an essential flue gas heat exchange device to solve this problem efficiently.

As a core finned tube heat exchanger installed at the boiler tail, the economizer is specially designed to preheat feedwater for heat recovery boiler units. It adopts counter-flow heat exchange structure: high-temperature flue gas flows through the outer side of finned tube bundles, while low-temperature boiler feedwater circulates inside the tubes. The flue gas waste heat is fully transferred to the feedwater, raising the water temperature before it enters the boiler drum or steam generator.

This preheating process greatly reduces the heating load of the heat recovery boiler. The boiler no longer needs to consume extra fuel or waste heat to heat up cold feedwater, effectively improving the overall thermal efficiency of the entire waste heat recovery system. Meanwhile, the cooled flue gas lowers the operating pressure of subsequent dust removal and exhaust treatment equipment, extending the service life of downstream system components.

Our custom economizer is widely used for heat recovery boiler, HRSG, industrial boiler and genset waste heat recovery projects. We provide different material configurations including carbon steel, ND steel, stainless steel finned tubes to adapt to various flue gas conditions with dust, moisture and slight corrosion. Optimized fin pitch and tube layout ensure low pressure drop, anti-fouling performance and stable long-term heat transfer efficiency.

Suitable for both new heat recovery boiler system matching and old energy-saving retrofit. The economizer effectively improves feedwater temperature, stabilizes boiler steam output, and helps factories reduce operating costs and achieve better energy-saving results.

If you need reliable economizer solutions to preheat feedwater for heat recovery boiler systems, welcome to contact us for customized design and project quotation.