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  697) JamesKag aus JamesKag schrieb am 18.September 2017 um 13:11 Uhr:
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A boiler is a closed vessel in which drinking water or other liquid is heated. The fluid will not boil. (In THE UNITED STATES, the term "furnace" is normally used if the reason is not to boil the fluid.) The warmed or vaporized fluid exits the boiler for use in various procedures or heating applications,[1 - [2 - including drinking water heating, central heating system, boiler-based power era, cooking, and sanitation.

The pressure vessel of a boiler is usually made of steel (or alloy steel), or of wrought iron historically. Stainless steel, especially of the austenitic types, is not used in wetted elements of boilers credited to corrosion and stress corrosion cracking.[3 - However, ferritic stainless steel is often found in superheater sections that won't be exposed to boiling drinking water, and electrically heated stainless shell boilers are allowed under the Western "Pressure Equipment Directive" for production of steam for sterilizers and disinfectors.[4 -
https://en.wikipedia.org/wiki/Boiler - https://en.wikipedia.org/wiki/Boiler
In live steam models, copper or brass is often used since it is more fabricated in smaller size boilers easily. Historically, copper was often used for fireboxes (especially for vapor locomotives), because of its better formability and higher thermal conductivity; however, in more recent times, the high price of copper often makes this an uneconomic choice and cheaper substitutes (such as metal) are used instead.

For a lot of the Victorian "age group of vapor", the only material used for boilermaking was the highest grade of wrought iron, with set up by rivetting. This iron was from specialist ironworks, such as at Cleator Moor (UK), noted for the high quality of their rolled plate and its suitability for high-reliability use in critical applications, such as high-pressure boilers. In the 20th century, design practice transferred towards the use of steel instead, which is stronger and cheaper, with welded construction, which is quicker and requires less labour. It ought to be noted, however, that wrought iron boilers corrode far slower than their modern-day steel counterparts, and are less susceptible to localized pitting and stress-corrosion. This makes the longevity of older wrought-iron boilers significantly more advanced than those of welded steel boilers.

Cast iron may be used for the heating system vessel of domestic drinking water heaters. Although such heaters are usually termed "boilers" in some countries, their purpose is usually to produce warm water, not steam, and they also run at low pressure and stay away from boiling. The brittleness of cast iron makes it impractical for high-pressure steam boilers.
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The foundation of heat for a boiler is combustion of any of several fuels, such as wood, coal, oil, or natural gas. Electric vapor boilers use level of resistance- or immersion-type heating system elements. Nuclear fission is also used as a heat source for generating steam, either straight (BWR) or, in most cases, in specialised temperature exchangers called "vapor generators" (PWR). Temperature recovery vapor generators (HRSGs) use the heat rejected from other processes such as gas turbine.

Boiler efficiency
there are two methods to measure the boiler efficiency 1) direct method 2) indirect method

Immediate method -direct approach to boiler efficiency test is more usable or even more common

boiler efficiency =Q*((Hg-Hf)/q)*(GCV *100 ) Q =Total steam movement Hg= Enthalpy of saturated vapor in k cal/kg Hf =Enthalpy of feed water in kcal/kg q= quantity of gasoline use in kg/hr GCV =gross calorific value in kcal/kg like pet coke (8200 kcal/KG)

indirect method -to gauge the boiler efficiency in indirect method, we need a following parameter like

Ultimate analysis of fuel (H2,S2,S,C moisture constraint, ash constraint)
percentage of O2 or CO2 at flue gas
flue gas temperature at outlet
ambient temperature in deg c and humidity of air in kg/kg
GCV of fuel in kcal/kg
ash percentage in combustible fuel
GCV of ash in kcal/kg
Boilers can be classified in to the following configurations:

Container boiler or Haycock boiler/Haystack boiler: a primitive "kettle" where a open fire heats a partially filled drinking water pot from below. 18th century Haycock boilers generally produced and stored large volumes of very low-pressure steam, hardly above that of the atmosphere often. These could burn off wood or frequently, coal. Efficiency was suprisingly low.
Flued boiler with one or two large flues-an early type or forerunner of fire-tube boiler.

Diagram of a fire-tube boiler
Fire-tube boiler: Here, water partially fills a boiler barrel with a small volume left above to support the steam (steam space


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  695) XRumerTest aus XRumerTest schrieb am 17.September 2017 um 12:44 Uhr:
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