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An economiser is a device fitted to a boiler which saves energy by using the exhaust gases from the boiler to pre-heat the cold water used the fill it (the feed water). Wikipedia does not have an article with this exact name. ... A boiler is a closed vessel in which water or other fluid is heated under pressure. ...

The first successful design of economiser was used to increase the steam-raising efficiency of the boilers of stationary steam engines. It was patented by Edward Green in 1845, and since then has been known as Green's economiser. It consisted of an array of vertical cast iron tubes connected to a tank of water above and below, between which the boiler's exhaust gases passed. This is the reverse arrangement to that of fire tubes in a boiler itself; there the hot gases pass through tubes immersed in water, whereas in an economiser the water passes through tubes surrounded by hot gases. The most successful feature of Green's design of economiser was its mechanical scraping apparatus, which was needed to keep the tubes free of deposits of soot. The thermal efficiency () is a dimensionless performance measure of a thermal device such as an internal combustion engine, a boiler, or a furnace, for example. ... Stationary steam engines are fixed steam engines used for pumping or driving mills and factories, and for power generation. ... Exclusive English shoe maker based out of Northampton, England. ... 1845 was a common year starting on Wednesday (see link for calendar). ... Cast iron usually refers to grey cast iron, but can mean any of a group of iron-based alloys containing more than 2% carbon (alloys with less carbon are carbon steel by definition). ... Soot, also called lampblack, Pigment Black 7, carbon black or black carbon, is a dark powdery deposit of unburned fuel residues, usually composed mainly of amorphous carbon, that accumulates in chimneys, automobile mufflers and other surfaces exposed to smoke—especially from the combustion of carbon-rich organic fuels in the...

Economisers were eventually fitted to virtually all stationary steam engines in the decades following Green's invention. Some preserved stationary steam engine sites still have their Green's economisers although usually they are not used. One such preserved site is the Claymills Pumping Engines Trust in Staffordshire, England, which is in the process of restoring one set of economisers and the associated steam engine which drove them. Claymills Pumping Station is a restored victorian sewage pumping station on the north side of Burton-upon-Trent. ...

Modern-day boilers (such as those in coal-fired power stations) are still fitted with economisers which are descendants of Green's original design. In this context they are often referred to as feedwater heaters and heat the condensate from turbines before it is pumped to the boilers. Coal Coal (IPA: ) is a fossil fuel extracted from the ground by underground mining or open-pit mining (surface mining). ... Oil power plant in Iraq A power station or power plant is a facility for the generation of electric power. ... A Feedwater heater is a power plant component used to pre-heat water delivered to the boiler. ... Rituraj-rituraj 07:07, 7 January 2007 (UTC) A rotor of a modern steam turbine, used in a power plant A steam turbine is a mechanical device that extracts thermal energy from pressurized steam, and converts it into useful mechanical work. ...

References

• Richard L. Hills (1989). Power from steam: A history of the stationary steam engine. Cambridge University Press. ISBN 0-521-45834-X.