A typical natural gas fired 3-pass shell boiler raising steam at 10 bar g will exhaust flue gases to atmosphere at approximately 230°C making it a valuable source for heat recovery. The treated water fed to the boiler from the storage tank is typically maintained at a temperature of 80-85°C.
A boiler economiser fitted to the flue exhaust of such a boiler will cool the flue gases down from 230°C to approximately 140°C while pressurised boiler feed water fed from the feed water pump is preheated from 80°C up to approximately 105°C before entering the boiler.
This means a reduction in fuel consumption of 4-6% for the same boiler output, resulting in a 6-18 month return on investment for the complete project installed and commissioned.
- Bespoke design to suit the individual boiler system
- Design conforms to BS EN 12952, the Pressure Equipment Directive (PED) and CE marked accordingly
- Manufactured entirely from carbon steel as the most economical design
- Highly durable extended surface fins spirally TIG welded around the outside of each boiler economiser tube
- Single tube design ensuring a uniform boiler feed water flow through the entire tube element even on a high boiler turn down, avoiding undesirable local hot spots, scaling and sludge build up inside the boiler economiser tubes
- Designed to minimise additional back pressure on the burner fan and additional load on the boiler feed pump at maximum boiler load such that normal boiler operation is not affected
See more about steam boiler economisers ThermTech have supplied to our customers in our Case Study.