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Отзыв: A boiler is a closed vessel in which drinking water or other liquid is heated. The fluid does not boil. (In THE UNITED STATES, the word "furnace" is normally used if the reason is never to boil the liquid.) The warmed or vaporized fluid exits the boiler for use in a variety of heating or procedures applications,[1][2] including drinking water heating, central heating system, boiler-based power generation, food preparation, and sanitation. Materials The pressure vessel of the boiler is usually manufactured from steel (or alloy steel), or historically of wrought iron. Stainless steel, especially of the austenitic types, is not used in wetted elements of boilers due to corrosion and stress corrosion breaking.[3] However, ferritic stainless is often found in superheater sections that won't 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] [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), due to 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 of vapor", the only materials used for boilermaking was the best grade of wrought iron, with set up by rivetting. This iron was extracted from specialist ironworks, such as at Cleator Moor (UK), observed for the high quality of their rolled plate and its own suitability for high-reliability use in critical applications, such as high-pressure boilers. In the 20th century, design practice moved towards the utilization of metal instead, which is stronger and cheaper, with welded construction, which is quicker and requires less labour. It ought to be observed, however, that wrought iron boilers corrode considerably slower than their modern-day metal counterparts, and are less susceptible to localized pitting and stress-corrosion. This makes the durability of older wrought-iron boilers significantly superior to those of welded steel boilers. Cast iron may be used for the heating vessel of domestic drinking water heaters. Although such heaters are usually termed "boilers" in some countries, their purpose will be to produce warm water, 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 steam boilers. Boiler Repairs Colindale, Kingsbury, NW9, Boiler Breakdown Emergency Service [url=http://boiler-repairs-colindale.co.uk]Boiler Repairs Colindale, Kingsbury, NW9, Boiler Breakdown Emergency Service![/url] Energy The source of heat for a boiler is combustion of some of several fuels, such as wood, coal, oil, or gas. Electric vapor boilers use resistance- or immersion-type heating elements. Nuclear fission can be used as a heat source for producing steam also, either straight (BWR) or, generally, in specialised warmth exchangers called "vapor generators" (PWR). Warmth recovery steam generators (HRSGs) use the heat rejected from other procedures such as gas turbine. Boiler efficiency there are two methods to gauge the boiler efficiency 1) direct method 2) indirect method Immediate method -immediate approach to boiler efficiency test is more useful or more common boiler efficiency =Q*((Hg-Hf)/q)*(GCV *100 ) Q =Total steam movement Hg= Enthalpy of saturated steam in k cal/kg Hf =Enthalpy of feed water in kcal/kg q= level of gas 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 subsequent 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 Configurations Boilers can be classified in to the following configurations: Pot boiler or Haycock boiler/Haystack boiler: a primitive "kettle" in which a fireplace heats a partially filled drinking water box from below. 18th century Haycock boilers generally produced and stored large volumes of very low-pressure vapor, barely above that of the atmosphere often. These could burn off wood or most often, coal. Efficiency was suprisingly low. Flued boiler with a couple of large flues-an early forerunner or type of fire-tube boiler. Diagram of a fire-tube boiler Fire-tube boiler: Here, water partially fills a boiler barrel with a little volume still left above to support the steam (vapor space). This is the type of boiler used in nearly all steam locomotives. The heat source is inside a furnace or firebox that has to be held permanently surrounded by the water in order to maintain the heat range of the heating system surface below the boiling point. The furnace can be situated at one end of the fire-tube which lengthens the path of the hot gases, thus augmenting the heating system surface which may be further increased by making the gases reverse direction through a second parallel pipe or a bundle of multiple tubes (two-pass or come back flue boiler); additionally the gases may be taken along the edges and then under 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 pass through a bundle of fire pipes inside the barrel which greatly escalates the heating surface compared to a single pipe and further boosts heat transfer. Fire-tube boilers usually have a comparatively low rate of vapor creation, but high steam storage capacity. Fire-tube boilers mainly burn off solid fuels, but are readily adaptable to the people of the gas or water variety. Diagram of a water-tube boiler. Water-tube boiler: In this type, pipes filled with drinking water are arranged in the furnace in several possible configurations. Usually the drinking water pipes connect large drums, the lower ones including drinking water and the top ones vapor and drinking water; in other instances, like a mono-tube boiler, drinking water is circulated by a pump through a succession of coils. This kind generally provides high vapor creation rates, but less storage space capacity than the above. Water tube boilers can be designed to exploit any warmth source and tend to be preferred in high-pressure applications since the high-pressure water/vapor is included within small size pipes which can withstand the pressure with a thinner wall structure. Flash boiler: A flash boiler is a specialized type of water-tube boiler in which 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 up with water. In a flash boiler, the pipe is kept so hot that the water give food to is quickly flashed into steam and superheated. Flash boilers had some use in automobiles in the 19th century which 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 mixed in the following manner: the firebox contains an set up of water tubes, called thermic siphons. The gases pass through a typical firetube boiler then. Water-tube fireboxes were installed in many Hungarian locomotives,[citation needed] but have met with little success far away. Sectional boiler. Inside a ensemble 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 like the American Culture of Mechanical Engineers (ASME) develop specifications and regulation rules. For example, the ASME Boiler and Pressure Vessel Code is a standard providing a wide range of guidelines and directives to ensure compliance of the boilers and other pressure vessels with safety, security and design 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 steel shells can rupture, while welded or riveted seams could start poorly, leading to a violent eruption of the pressurized vapor. When drinking 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. Because of this, vapor is a superb way of moving energy and warmth around a site from a central boiler house to where it is needed, but without the right boiler give food to water treatment, a steam-raising place are affected from size 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 pipes can also spray scalding-hot steam and smoke out of the air intake and firing chute, injuring the firemen who fill the coal in to the fireplace chamber. Extremely large boilers providing hundreds of horsepower to operate factories could demolish entire structures.[6] A boiler that has a loss of feed drinking water and is permitted to boil dry can be extremely dangerous. If feed water is sent into the unfilled boiler then, the small cascade of incoming drinking water instantly boils on contact with the superheated metal shell and leads to a violent explosion that can't be managed even by basic safety steam valves. Draining of the boiler can also happen if a leak occurs in the steam supply lines that is larger than the make-up water source could replace. The Hartford Loop was created in 1919 by the Hartford Steam Boiler and INSURANCE PROVIDER as a method to assist in preventing this problem from taking place, and therefore reduce their insurance statements.[7][8] Superheated steam boiler A superheated boiler on a steam locomotive. Main article: Superheater Most boilers produce steam to be utilized at saturation temperatures; that is, saturated steam. Superheated steam boilers vaporize water and further heat up the steam in a superheater then. This provides vapor at higher temperature, but can decrease the overall thermal efficiency of the vapor generating seed because the bigger steam temp takes a higher flue gas exhaust temperature.[citation needed] There are several ways to circumvent this problem, by providing an economizer that heats the give food to drinking water typically, a combustion air heating unit in the hot flue gas exhaust route, or both. You can find benefits to superheated vapor that may, and will often, increase overall efficiency of both steam generation and its utilization: benefits in input temperature to a turbine should outweigh any cost in additional boiler problem and expense. There may be useful limitations in using moist 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 flee, the high pressure and temperature can cause serious, instantaneous injury to anyone in its path. Since the escaping steam will at first be completely superheated vapor, detection can be difficult, although the extreme heat and sound from such a leak obviously indicates its presence. Superheater procedure is similar to that of the coils on an 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 area is normally between 1,300 and 1,600 В°C (2,372 and 2,912 В°F). Some superheaters are radiant 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 high temperature in the flue gas route will also warmth the superheater steam piping and the vapor within. While the temperature of the vapor in the superheater increases, the pressure of the vapor will 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 avoid harm to the turbine blading and associated piping. Supercritical steam generator Boiler for a power herb. 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 high 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 era of steam bubbles within water, because the pressure is above the critical pressure point of which steam bubbles can form. As the fluid expands through the turbine phases, its thermodynamic condition drops below the critical point as it does work turning the turbine which turns the electrical generator that power is eventually extracted. The liquid at that time may be considered a mix of vapor and liquid droplets as it passes in to the condenser. This results in less fuel use and therefore less greenhouse gas production slightly. The word "boiler" shouldn't be used for a supercritical pressure steam generator, as no "boiling" occurs in this device. Boiler Repairs Colindale, Kingsbury, NW9, Boiler Breakdown Emergency Service [url=http://boiler-repairs-colindale.co.uk]More info![/url] Accessories Boiler fittings and accessories Pressuretrols to regulate the vapor pressure in the boiler. Boilers generally have 2 or 3 3 pressuretrols: a manual-reset pressuretrol, which functions as a basic safety by setting the upper limit of steam pressure, the operating pressuretrol, which settings when the boiler fires to maintain pressure, and for boilers outfitted with a modulating burner, a modulating pressuretrol which handles the amount of fire. Safety valve: It is utilized to alleviate pressure and prevent possible explosion of the boiler. Water level indicators: They show the operator the level of fluid in the boiler, also known as a sight glass, water gauge or water column. Bottom level blowdown valves: They provide a means for removing solid particulates that condense and rest on underneath of a boiler. As the name indicates, this valve is located straight on underneath of the boiler usually, and is sometimes opened to use the pressure in the boiler to drive these particulates out. Continuous blowdown valve: This enables a small quantity of water to flee continuously. Its purpose is to prevent the water in the boiler becoming saturated with dissolved salts. Saturation would business lead to foaming and cause water droplets to be carried over with the steam - a condition known as priming. Blowdown is also often used to monitor the chemistry of the boiler water. Trycock: a kind of valve that is often use to manually check a liquid level in a tank. Most found on a water boiler commonly. Flash container: High-pressure blowdown enters this vessel where in fact the steam can 'flash' safely and become used in a low-pressure system or be vented to atmosphere as the ambient pressure blowdown flows to drain. Automatic blowdown/constant heat recovery system: This system allows the boiler to blowdown only once makeup water is moving to the boiler, thereby transferring the maximum amount of heat possible from the blowdown to the makeup water. No flash tank is normally needed as the blowdown discharged is near to the temp of the makeup water. Hand openings: They may be steel 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 switch) that is utilized to turn off the burner or shut down gasoline to the boiler to avoid it from working once the water goes below a certain point. If a boiler is "dry-fired" (burned without drinking water in it) it can cause rupture or catastrophic failure. Surface blowdown line: It offers a way for removing foam or other light-weight non-condensible substances that tend to float on top of water inside the boiler. Circulating pump: It is designed 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 may be fitted to the side of the boiler, just below water level, or to the very best of the boiler.[10] Top give food to: In this design for feedwater injection, water is fed to the very best of the boiler. This can reduce boiler fatigue triggered by thermal stress. By spraying the feedwater over a series of trays water is quickly heated and this can reduce limescale. Desuperheater pipes or bundles: Some tubes or bundles of pipes in the water drum or the vapor drum designed to cool superheated steam, in order to provide auxiliary equipment that does not need, or may be damaged by, dry out vapor. Chemical substance injection line: A connection to 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 Gasoline 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 plate:


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