steam boiler!

steam boiler

Comprehensive Analysis

1) "Steam" -- As to steam boiler 1steam Pronunciation: 'stEm Function: noun Etymology: Middle English stem, from Old English stEam; akin to Dutch stoom steam 1 : a vapor arising from a heated substance 2 a : the invisible vapor into which water is converted when heated to the boiling point b : the mist formed by the condensation on cooling of water vapor 3 a : water vapor kept under pressure so as to supply energy for heating, cooking, or mechanical work; also : the power so generated b : active force : POWER, MOMENTUM <got there under his own steam> <sales began to pick up steam>; also : normal force <at full steam> c : pent-up emotional tension <needed to let off a little steam> 4 a : STEAMER 2a b : travel by or a trip in a steamer Pronunciation Symbols It has been suggested that this article be split into articles entitled steam and water vapor, accessible from a disambiguation page. (Discuss) A temperature-versus-entropy diagram for steam A Mollier enthalpy-versus-entropy diagram for steam In physical chemistry, and in engineering, steam refers to vaporized water. It is a pure, completely invisible gas (for mist see below). Pure steam (unmixed with air, but in equilibrium with water-liquid) has a temperature of around 100 degrees Celsius at standard atmospheric pressure, and occupies about 1,600 times the volume of liquid water (steam can of course be much hotter than the boiling point of water; such steam is usually called superheated steam). In the atmosphere, the partial pressure of water is much lower than 1 atm, therefore gaseous water can exist at temperatures much lower than 100 C (see water vapor and humidity). In common speech, steam most often refers to the white mist that condenses above boiling water as the hot vapor ("steam" in the first sense) mixes with the cooler air. This mist is made of tiny droplets of liquid water, not gaseous water, so it is no longer technically steam. A steam engine uses the expansion of steam to drive a piston or turbine to perform mechanical work. In other industrial applications steam is used as a repository of energy, which is introduced and extracted by heat transfer, usually through pipes. Steam is a capacious reservoir for energy because of water's high heat of vaporization. The ability to return condensed steam as water-liquid to the boiler at high pressure with relatively little expenditure of pumping power is also important. Engineers use an idealised thermodynamic cycle, the Rankine cycle, to model the behaviour of steam engines. In the U.S., more than 90% of electric power is produced using steam as the working fluid, mainly by steam turbines. Condensation of steam to water often occurs at the low-pressure end of a steam turbine, since this..." 2) "Boiler" -- As to steam boiler boil·er Pronunciation: 'boi-l&r Function: noun 1 : one that boils 2 a : a vessel used for boiling b : the part of a steam generator in which water is converted into steam and which consists usually of metal shells and tubes c : a tank in which water is heated or hot water is stored Pronunciation Symbols A boiler is a closed vessel in which water or other fluid is heated under pressure. The fluid is then circulated out of the boiler for use in various processes or heating applications. 1 Overview 2 Superheated Steam Boilers 3 Supercritical Steam Generators 4 Hydronic boilers 5 Accessories 5.1 Boiler fittings 5.2 Steam accessories 5.3 Combustion accessories 6 Controlling draft 7 See also 8 References Diagram of a fire-tube boiler Construction of boilers is mainly limited to copper, steel and cast iron. In live steam toys, brass is often used. The source of heat for a boiler is combustion of any of several fuels, such as wood, coal, oil, or natural gas. Electric boilers use resistance or immersion type heating elements. Nuclear fission is also used as a heat source for generating steam. Heat recovery steam generators (HRSGs) use the heat rejected from other processes such as gas turbines. Boilers can also be classified into: Fire-tube boilers. Here, the heat source is inside the tubes and the water to be heated is outside. Water-tube boilers. Here the heat source is outside the tubes and the water to be heated is inside. A primitive, inefficient type where there are no tubes and the fire heats one side of the water container. The goal is to make the heat flow as completely as possible from the heat source to the water. For example, steam locomotives have fire-tube boilers, where the fire is inside the tube and the water on the outside. These usually take the form of a set of straight tubes passing through the boiler through which hot combustion gases flow. Diagram of a water-tube boiler. In water-tube boilers the water flows through tubes a..." 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