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A boiler is a closed vessel where drinking water or other liquid is heated. The fluid will not boil. (In THE UNITED STATES, the word "furnace" is generally used if the purpose is never to boil the liquid.) The warmed or vaporized fluid exits the boiler for use in various processes or heating applications,[1 - [2 - including drinking water heating, central heating, boiler-based power generation, food preparation, and sanitation.

Materials
The pressure vessel of a boiler is usually manufactured from steel (or alloy steel), or of wrought iron historically. Stainless steel, of the austenitic types especially, is not used in wetted elements of boilers due to stress and corrosion corrosion cracking.[3 - However, ferritic stainless is often used in superheater sections that will not be exposed to boiling water, and electrically heated stainless shell boilers are allowed under the Western european "Pressure Equipment Directive" for creation 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 easily fabricated in smaller size boilers. Historically, copper was often used for fireboxes (particularly for steam locomotives), due to its better formability and higher thermal conductivity; however, in newer times, the high price of copper often makes this an uneconomic choice and cheaper substitutes (such as steel) are used instead.

For a lot of the Victorian "age group of vapor", the only materials used for boilermaking was the best grade of wrought iron, with set up by rivetting. This iron was often obtained from specialist ironworks, such as at Cleator Moor (UK), observed 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 instead transferred towards the utilization of metal, which is more powerful and cheaper, with welded structure, which is quicker and requires less labour. It ought to be observed, however, that wrought iron boilers corrode considerably slower than their modern-day steel counterparts, and are less vunerable to localized stress-corrosion and pitting. This makes the longevity of older wrought-iron boilers much superior to those of welded steel boilers.

Cast iron can be utilized for the heating vessel of local drinking water heaters. Although such heaters are usually termed "boilers" in some countries, their purpose is to produce warm water usually, not steam, and so they run at low pressure and stay away from boiling. The brittleness of cast iron makes it impractical for high-pressure vapor boilers.
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Energy
The foundation of heat for a boiler is combustion of some 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 producing steam, either directly (BWR) or, generally, in specialised temperature exchangers called "vapor generators" (PWR). Heat recovery steam generators (HRSGs) use heat rejected from other procedures such as gas turbine.

Boiler efficiency
there are two solutions to gauge the boiler efficiency 1) direct method 2) indirect method

Direct method -direct method of boiler efficiency test is more functional or even more common

boiler efficiency =Q*((Hg-Hf)/q)*(GCV *100 ) Q =Total vapor stream Hg= Enthalpy of saturated steam in k cal/kg Hf =Enthalpy of give food to drinking 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 are in need of a following parameter like

Ultimate analysis of gas (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 gas in kcal/kg
ash percentage in combustible fuel
GCV of ash in kcal/kg
Configurations
Boilers can be classified into the following configurations:

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

Diagram of the fire-tube boiler
Fire-tube boiler: Here, water partially fills a boiler barrel with a small volume remaining above to accommodate the steam (vapor space). This is the type of boiler used in almost all steam locomotives. The heat source is inside a furnace or firebox that needs to be kept permanently surrounded by the water in order to keep the heat of the heating surface below the boiling point. The furnace can be situated at one end of the fire-tube which lengthens the road of the hot gases, thus augmenting the heating system surface which can be further increased by causing the gases invert direction through a second parallel tube or a lot of money of multiple tubes (two-pass or return flue boiler); on the other hand the gases may be taken along the sides and then under the boiler through flues (3-pass boiler). In case of a locomotive-type boiler, a boiler barrel extends from the firebox and the hot gases go through a bundle of fire tubes inside the barrel which greatly increases the heating system surface compared to a single pipe and further improves heat transfer. Fire-tube boilers have a comparatively low rate of vapor production usually, but high vapor storage capacity. Fire-tube boilers mainly burn off solid fuels, but are easily flexible to those of the liquid or gas variety.

Diagram of the water-tube boiler.
Water-tube boiler: In this kind, tubes filled with drinking water are arranged inside a furnace in a number of possible configurations. Often the drinking water tubes connect large drums, the lower ones containing water and top of the ones water and steam; in other instances, such as a mono-tube boiler, drinking water is circulated with a pump through a succession of coils. This type provides high steam production rates generally, but less storage space capacity than the above. Water pipe boilers can be designed to exploit any high temperature source and are generally preferred in high-pressure applications since the high-pressure drinking water/vapor is contained within small diameter pipes which can withstand the pressure with a thinner wall structure.
Flash boiler: A flash boiler is a specialized type of water-tube boiler where pipes are close jointly and drinking water is pumped through them. A flash boiler differs from the type of mono-tube vapor generator where the tube is permanently filled with water. Super fast boiler, the pipe is held so hot that water give food to is quickly flashed into vapor and superheated. Flash boilers acquired some use in cars in the 19th century and this use continued into the early 20th century. .

1950s design steam locomotive boiler, from a Victorian Railways J class
Fire-tube boiler with Water-tube firebox. Sometimes the two above types have been combined in the following manner: the firebox includes an set up of water tubes, called thermic siphons. The gases pass through a conventional firetube boiler then. Water-tube fireboxes were installed in many Hungarian locomotives,[citation needed - but have fulfilled with little success in other countries.
Sectional boiler. In a ensemble iron sectional boiler, sometimes called a "pork chop boiler" water is contained inside solid iron areas.[citation needed - These areas are assembled on site to produce the finished boiler.
Safety
See also: Boiler explosion
To define and secure boilers safely, some professional specialized organizations like the American Society of Mechanical Technicians (ASME) develop standards and regulation codes. For instance, the ASME Boiler and Pressure Vessel Code is a typical providing an array of rules and directives to ensure compliance of the boilers and other pressure vessels with basic safety, security and design standards.[5 -

Historically, boilers were a way to obtain many serious injuries and property destruction as a consequence to poorly understood engineering principles. Thin and brittle metallic shells can rupture, while poorly welded or riveted seams could start, resulting in a violent eruption of the pressurized steam. When water is converted to vapor it expands to over 1,000 times its original travels and volume down steam pipes at over 100 kilometres each hour. As a result of this, vapor is a great way of moving energy and warmth around a niche site from a central boiler house to where it is needed, but without the right boiler give food to water treatment, a steam-raising vegetable will suffer from level corrosion and formation. At best, this raises energy costs and can result in poor quality vapor, reduced efficiency, shorter plant life and unreliable procedure. At worst, it can result in catastrophic failure and loss of life. Collapsed or dislodged boiler tubes can also aerosol scalding-hot steam and smoke out of the air intake and firing chute, injuring the firemen who insert the coal into the open fire chamber. Extremely large boilers providing hundreds of horsepower to operate factories could demolish entire buildings.[6 -

A boiler that has a loss of feed water and is permitted to boil dry out can be hugely dangerous. If feed drinking water is sent in to the empty boiler then, the small cascade of inbound water instantly boils on connection with the superheated metal shell and leads to a violent explosion that can't be controlled even by security steam valves. Draining of the boiler can also happen if a leak occurs in the vapor supply lines that is bigger than the make-up water source could replace. The Hartford Loop was developed in 1919 by the Hartford Steam Boiler and Insurance Company as a strategy to help prevent this condition from taking place, and thereby reduce their insurance promises.[7 - [8 -

Superheated steam boiler

A superheated boiler on the steam locomotive.
Main article: Superheater
Most boilers produce steam to be used at saturation temperature; that is, saturated vapor. Superheated steam boilers vaporize the water and additional heating the steam in a superheater then. This provides vapor at higher temperatures, but can decrease the overall thermal efficiency of the steam generating flower because the bigger steam heat range takes a higher flue gas exhaust temp.[citation needed - There are many ways to circumvent this issue, by giving an economizer that heats the give food to drinking water typically, a combustion air heater in the hot flue gas exhaust path, or both. You will find advantages to superheated vapor that may, and often will, increase overall efficiency of both vapor generation and its own utilization: benefits in input temperatures to a turbine should outweigh any cost in additional boiler complication and expense. There can also be practical restrictions in using moist steam, as entrained condensation droplets will harm turbine blades.

Superheated steam presents unique safety concerns because, if any system component fails and allows steam to escape, the ruthless and temperature can cause serious, instantaneous harm to anyone in its path. Since the escaping steam will be completely superheated vapor, detection can be difficult, although the extreme heat and sound from such a leak clearly indicates its presence.

Superheater procedure is similar to that of the coils on an fresh air conditioning unit, although for a different purpose. The steam piping is directed through the flue gas route in the boiler furnace. The temperature in this field is between 1 typically,300 and 1,600 °C (2,372 and 2,912 °F). Some superheaters are glowing type; that is, they absorb high temperature by radiation. Others are convection type, absorbing temperature from a liquid. Some are a mixture of the two types. Through either method, the extreme warmth in the flue gas path will also warmth the superheater steam piping and the steam within. While the temperatures of the steam in the superheater rises, the pressure of the vapor does not and the pressure remains the same as that of the boiler.[9 - Almost all steam superheater system designs remove droplets entrained in the steam to prevent harm to the turbine blading and associated piping.

Supercritical steam generator

Boiler for a power flower.
Main article: Supercritical steam generator
Supercritical steam generators are generally used for the production of electric power. They operate at supercritical pressure. In contrast to a "subcritical boiler", a supercritical steam generator operates at such a higher pressure (over 3,200 psi or 22 MPa) that the physical turbulence that characterizes boiling ceases to occur; the liquid is neither water nor gas but a super-critical liquid. There is absolutely no generation of steam bubbles within the water, because the pressure is above the critical pressure point of which vapor bubbles can develop. As the fluid expands through the turbine stages, its thermodynamic state drops below the critical point as it does work turning the turbine which changes the electrical generator from which power is eventually extracted. The fluid at that time may be considered a mix of vapor and liquid droplets as it passes into the condenser. This leads to somewhat less fuel use and therefore less greenhouse gas production. The word "boiler" shouldn't be used for a supercritical pressure vapor generator, as no "boiling" occurs in this device.
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Accessories
Boiler accessories and fittings
Pressuretrols to control the vapor pressure in the boiler. Boilers generally have 2 or 3 3 pressuretrols: a manual-reset pressuretrol, which functions as a protection by setting top of the limit of steam pressure, the operating pressuretrol, which settings when the boiler fires to keep up pressure, as well as for boilers equipped with a modulating burner, a modulating pressuretrol which handles the quantity of fire.
Basic safety valve: It is utilized to relieve pressure and prevent possible explosion of the boiler.
Water level indications: They show the operator the amount of fluid in the boiler, also called a view cup, water measure or water column.
Bottom level blowdown valves: They provide a means for removing solid particulates that condense and lay on the bottom of a boiler. As the name suggests, this valve is usually located on the bottom of the boiler, and is sometimes opened to use the pressure in the boiler to drive these particulates out.
Constant blowdown valve: This allows a small level of water to flee continuously. Its purpose is to prevent water in the boiler becoming saturated with dissolved salts. Saturation would lead to foaming and cause drinking water droplets to be carried over with the steam - an ailment known as priming. Blowdown is often used to monitor the chemistry of the boiler drinking water also.
Trycock: a kind of valve that is often use to manually check a water level in a tank. Most found on a drinking water boiler commonly.
Flash container: High-pressure blowdown enters this vessel where the steam can 'flash' safely and be used in a low-pressure system or be vented to atmosphere as the ambient pressure blowdown moves to drain.
Automatic blowdown/constant heat recovery system: This system allows the boiler to blowdown only once make-up water is moving to the boiler, thereby transferring the utmost amount of heat possible from the blowdown to the make-up water. No flash tank is normally needed as the blowdown discharged is near to the heat range of the make-up water.
Hand openings: They may be metal plates installed in openings in "header" to permit for inspections & installing tubes and inspection of internal surfaces.
Steam drum internals, some screen, scrubber & cans (cyclone separators).
Low-water cutoff: It is a mechanical means (usually a float change) that is used to turn off the burner or shut off fuel to the boiler to prevent it from running once the drinking water moves below a certain point. If a boiler is "dry-fired" (burnt without water in it) it can cause rupture or catastrophic failure.
Surface blowdown line: It offers a way for removing foam or other lightweight non-condensible substances that tend to float on top of the water inside the boiler.
Circulating pump: It is designed to circulate drinking water back again to the boiler after it has expelled a few of its heat.
Feedwater check valve or clack valve: A non-return stop valve in the feedwater series. This may be fitted to the relative side of the boiler, below the water level just, or to the top of the boiler.[10 -
Top feed: Within this design for feedwater injection, the water is fed to the top of the boiler. This can reduce boiler exhaustion triggered by thermal stress. By spraying the feedwater over a series of trays the water is quickly heated and this can reduce limescale.
Desuperheater tubes or bundles: A series of tubes or bundles of tubes in the water drum or the steam drum made to cool superheated steam, in order to supply auxiliary equipment that will not need, or may be damaged by, dry vapor.
Chemical injection line: A link with add chemicals for controlling feedwater pH.
Steam accessories
Main steam stop valve:
Steam traps:
Main vapor stop/check valve: It is utilized on multiple boiler installations.
Combustion accessories
Fuel oil system:fuel oil heaters
Gas system:
Coal system:
Soot blower
Other essential items
Pressure gauges:
Feed pumps:
Fusible plug:
Inspectors test pressure gauge attachment:
Name plate:
Registration dish:

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