Heat Recovery System
Air Preheater
Reduced fuel consumption and better environmental credentials are provided by the use of air preheaters. The air preheater increases the thermal efficiency of the boiler process by recovering heat from the boiler’s flue gas and using that heat to raise the temperature of the air stream that is being directed into the combustion chamber.
The Boilermech team can custom-make multi-tubular air preheaters that range from singular to multiple pass designs. The heating surface is formed of bare industrial pipes arranged to ensure maximum heat transfer. Tube spacing is carefully designed to avoid fouling from taking place which may ordinarily impair the equipment efficiency or in adverse cases will cause unnecessary boiler down time. The air preheaters can also be configured for inline or staggered with bare tubes, depending on usage and site conditions.
Economiser
Economisers are designed to increase a boiler’s efficiency by reducing overall energy consumption. This is achieved by harnessing extra energy through the capture of waste heat from the boiler’s flue gases and using it to raise the temperature of the boiler’s feed water. The higher temperature of the incoming feed water reduces the need for additional energy input into the boiler, thus increasing the thermal efficiency of the process.
Heat Recovery Steam Generator
Heat recovery steam generators or HRSGs are exchangers that capture or recover heat from a hot gas stream which then produces steam that can be used in an industrial process or be used to drive a steam turbine. Put another way, HSRGs are used to convert energy from hot exhaust gases in power generation. An HSRG is made up of banks of tubes mounted in an exhaust stack. The exhaust gases heat these tubes from as much as 400°C to 650°C. Water is then pumped and circulated through the tubes and can be held under high pressure and then boiled to produce steam.