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A boiler is a closed vessel where drinking water or other liquid is heated. The fluid does not necessarily boil. (In THE UNITED STATES, the term "furnace" is generally used if the reason is not to boil the fluid.) The warmed or vaporized fluid exits the boiler for use in a variety of procedures or heating applications,[1][2] including water heating, central heating, boiler-based power generation, cooking food, and sanitation. Materials The pressure vessel of the boiler is usually made of steel (or alloy steel), or of wrought iron historically. Stainless steel, of the austenitic types especially, is not found in wetted parts of boilers thanks to stress and corrosion corrosion breaking.[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 European "Pressure Equipment Directive" for creation of steam for sterilizers and disinfectors.[4] [url=https://en.wikipedia.org/wiki/Boiler]https://en.wikipedia.org/wiki/Boiler[/url] In live steam models, copper or brass is often used because it is more easily fabricated in smaller size boilers. Historically, copper was often used for fireboxes (particularly for steam 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 much of the Victorian "age of steam", the only materials used for boilermaking was the best quality of wrought iron, with assembly by rivetting. This iron was 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 use of steel, which is stronger and cheaper, with welded construction, which is quicker and requires less labour. It should be mentioned, however, that wrought iron boilers corrode much 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 far 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 will be to produce hot water, not steam, and so they run at low pressure and stay away from boiling. The brittleness of cast iron helps it be impractical for high-pressure steam boilers. Boiler Repairs Greenwich, SE10, Boiler Breakdown Emergency Service [url=http://boiler-repairs-greenwich.co.uk]More info>>>[/url] 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 resistance- or immersion-type heating elements. Nuclear fission is also used as a heat source for producing steam, either straight (BWR) or, generally, in specialised warmth exchangers called "steam generators" (PWR). High temperature recovery vapor generators (HRSGs) use the heat rejected from other procedures such as gas turbine. Boiler efficiency there are two methods to measure the boiler efficiency 1) direct method 2) indirect method Direct method -direct method of boiler efficiency test is more functional or more common boiler efficiency =Q*((Hg-Hf)/q)*(GCV *100 ) Q =Total steam flow Hg= Enthalpy of saturated steam in k cal/kg Hf =Enthalpy of give food to water in kcal/kg q= level of gasoline use in kg/hr GCV =gross calorific value in kcal/kg like family pet coke (8200 kcal/KG) indirect method -to gauge the boiler efficiency in indirect method, we need a following parameter like Ultimate analysis of gasoline (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 gasoline in kcal/kg ash percentage in combustible fuel GCV of ash in kcal/kg Configurations Boilers can be classified in to the following configurations: Pot boiler or Haycock boiler/Haystack boiler: a primitive "kettle" where a fire heats a partially filled water container from below. 18th century Haycock boilers generally produced and stored large amounts of very low-pressure steam, often hardly above that of the atmosphere. These could burn wood or frequently, coal. Efficiency was very low. Flued boiler with a couple of large flues-an early forerunner or type 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 vapor (vapor space). This is the kind of boiler used in all steam locomotives nearly. The heat source is in the furnace or firebox that needs to be held completely surrounded by water in order to keep the heat of the heating surface below the boiling point. The furnace can be situated at one end of a fire-tube which lengthens the path of the hot gases, thus augmenting the heating system surface which may be further increased by causing the gases invert direction through another parallel tube or a lot of money of multiple tubes (two-pass or come back flue boiler); on the other hand the gases may be taken along the edges and then beneath the boiler through flues (3-pass boiler). In case there is 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 surface in comparison to a single tube and further improves heat transfer. Fire-tube boilers have a comparatively low rate of steam production usually, but high vapor storage capacity. Fire-tube boilers mainly burn off solid fuels, but are easily adaptable to those of the liquid or gas variety. Diagram of the water-tube boiler. Water-tube boiler: In this type, tubes filled up with water are arranged in the furnace in a number of possible configurations. Usually the drinking water tubes connect large drums, the lower ones containing water and the top ones water and steam; in other instances, like a mono-tube boiler, drinking water is circulated by a pump through a succession of coils. This type generally gives high vapor production rates, but less storage space capacity than the above mentioned. Water tube boilers can be made to exploit any warmth source and tend to be preferred in high-pressure applications because 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 kind of water-tube boiler in which pipes are close collectively and water is pumped through them. A flash boiler differs from the kind of mono-tube steam generator where the tube is permanently filled up with water. Super fast boiler, the pipe is kept so hot that the water feed is quickly flashed into steam and superheated. Flash boilers got some use in automobiles in the 19th century which use continued in to 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 mixed in the following manner: the firebox includes an set up of water tubes, called thermic siphons. The gases go 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. Within a cast iron sectional boiler, sometimes called a "pork chop boiler" the water is included 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 such as the American Culture of Mechanical Technical engineers (ASME) develop criteria and regulation codes. For example, the ASME Boiler and Pressure Vessel Code is a typical providing a wide range of guidelines and directives to ensure compliance of the boilers and other pressure vessels with security, design and security standards.[5] Historically, boilers were a way to obtain many serious injuries and property destruction as a consequence to badly 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 vapor. When drinking water is converted to steam it expands to over 1,000 times its original volume and moves down steam pipes at over 100 kilometres each hour. Because of this, steam is a great way of moving energy and temperature around a site from a central boiler house to where it is needed, but with no right boiler give food to water treatment, a steam-raising plant are affected from size corrosion and formation. At best, this increases energy costs and can result in poor quality steam, reduced efficiency, shorter vegetation and unreliable operation. At worst, it can lead to catastrophic loss and failure of life. Collapsed or dislodged boiler tubes can also spray scalding-hot vapor and smoke from the air intake and firing chute, injuring the firemen who weight the coal into the open fire chamber. Extremely large boilers providing a huge selection of horsepower to operate factories could demolish entire structures.[6] A boiler that has a loss of feed water and it is permitted to boil dry out can be extremely dangerous. If supply drinking water is sent in to the unfilled boiler then, the small cascade of incoming drinking water instantly boils on connection with the superheated steel shell and leads to a violent explosion that can't be controlled even by safety vapor valves. Draining of the boiler can also happen if a leak occurs in the vapor supply lines that is larger than the make-up water supply could replace. The Hartford Loop was created in 1919 by the Hartford Steam Boiler and INSURANCE PROVIDER as a method to help prevent this condition from occurring, and thus reduce their insurance promises.[7][8] Superheated steam boiler A superheated boiler on the steam locomotive. Main article: Superheater Most boilers produce vapor to be utilized at saturation temperature; that is, saturated vapor. Superheated steam boilers vaporize water and further heat up the steam in a superheater then. This provides steam at higher temperatures, but can decrease the overall thermal efficiency of the steam generating herb because the higher steam temp requires a higher flue gas exhaust heat.[citation needed] There are many ways to circumvent this problem, typically by giving an economizer that heats the give food to water, a combustion air heater in the hot flue gas exhaust path, or both. You will find benefits to superheated steam that may, and often will, increase overall efficiency of both steam generation and its utilization: benefits in input temp to a turbine should outweigh any cost in additional boiler problem and expense. There could be practical limitations in using damp vapor also, as entrained condensation droplets will harm turbine blades. Superheated steam presents unique safety concerns because, if any operational system component fails and allows steam to escape, the high pressure and temperature can cause serious, instantaneous injury to anyone in its path. Since the escaping steam will initially be completely superheated vapor, detection can be difficult, although the intense heat and sound from such a leak indicates its presence clearly. Superheater operation 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 heat range in this area is between 1 typically,300 and 1,600 °C (2,372 and 2,912 °F). Some superheaters are glowing type; that is, they absorb temperature by radiation. Others are convection type, absorbing temperature from a fluid. Some are a mixture of the two types. Through either method, the extreme warmth in the flue gas path will also heat the superheater steam piping and the steam within. While the temp of the steam in the superheater increases, the pressure of the vapor does not and the pressure remains exactly like that of the boiler.[9] Virtually 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 place. Main article: Supercritical steam generator Supercritical steam generators are used for the production of energy frequently. They operate at supercritical pressure. As opposed 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 that occurs; the fluid is liquid nor gas but a super-critical fluid neither. There is absolutely no generation of vapor bubbles within water, because the pressure is above the critical pressure point of which steam bubbles can form. As the liquid expands through the turbine stages, its thermodynamic condition drops below the critical point as it can work turning the turbine which changes the power 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 in to the condenser. This results in somewhat less fuel use and for that reason less greenhouse gas creation. The word "boiler" should not be used for a supercritical pressure vapor generator, as no "boiling" occurs in this device. Boiler Repairs Greenwich, SE10, Boiler Breakdown Emergency Service [url=http://boiler-repairs-greenwich.co.uk]More info>>>[/url] Accessories Boiler fittings and accessories Pressuretrols to regulate the steam pressure in the boiler. Boilers generally have two or three 3 pressuretrols: a manual-reset pressuretrol, which functions as a basic safety by setting the top limit of steam pressure, the operating pressuretrol, which controls when the boiler fires to maintain pressure, as well as for boilers equipped with a modulating burner, a modulating pressuretrol which handles the amount of fire. Security valve: It can be used to relieve pressure and prevent possible explosion of the boiler. Water level signals: They show the operator the level of fluid in the boiler, also known as a sight glass, water gauge or drinking water column. Bottom blowdown valves: They provide a way for removing solid particulates that condense and lay on underneath of the boiler. As the name indicates, this valve is situated directly on the bottom of the boiler usually, and is sometimes opened up to use the pressure in the boiler to press 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 water droplets to be transported 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 liquid level in a container. Most commonly found on a water boiler. Flash tank: High-pressure blowdown enters this vessel where the vapor can 'flash' safely and become used in a low-pressure system or be vented to atmosphere as the ambient pressure blowdown moves to drain. Automatic blowdown/continuous heat recovery system: This system allows the boiler to blowdown only when make-up water is flowing to the boiler, thereby transferring the utmost amount of heat possible from the blowdown to the makeup water. No flash container is generally needed as the blowdown discharged is near to the temperatures of the make-up water. Hand openings: They are metal plates installed in openings in "header" to allow for inspections & installation of tubes and inspection of inner surfaces. Steam drum internals, a series of screen, scrubber & cans (cyclone separators). Low-water cutoff: It is a mechanical means (usually a float change) that is utilized to turn off the burner or shut off gasoline to the boiler to avoid it from jogging once the drinking water moves below a certain point. If a boiler is "dry-fired" (burned without drinking water in it) it can cause rupture or catastrophic failing. Surface blowdown line: It provides a means for removing foam or other light-weight non-condensible chemicals that tend to float on top of water inside the boiler. Circulating pump: It is made to circulate water back again to the boiler after they have expelled a few of its heat. Feedwater check valve or clack valve: A non-return stop valve in the feedwater series. This can be fitted to the relative aspect of the boiler, below the water level just, or to the top of the boiler.[10] Top feed: In this design for feedwater injection, the water is fed to the top of the boiler. This can reduce boiler fatigue triggered by thermal stress. By spraying the feedwater over some trays the water is quickly warmed which can reduce limescale. Desuperheater tubes or bundles: A series of tubes or bundles of tubes in the water drum or the vapor drum made to cool superheated vapor, in order to supply auxiliary equipment that does not need, or may be damaged by, dry vapor. Chemical substance injection line: A connection to add chemicals for controlling feedwater pH. Steam accessories Main vapor stop valve: Steam traps: Main steam stop/check valve: It is used on multiple boiler installations. Combustion accessories Gasoline oil system:energy oil heaters Gas system: Coal system: Soot blower Other essential items Pressure gauges: Feed pumps: Fusible plug: Inspectors test pressure measure attachment: Name dish: Registration plate:

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