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Evaporator (marine)
An evaporator, distiller or distilling apparatus is a piece of ship's equipment used to produce fresh drinking water from sea water by distillation. As fresh water is bulky, may spoil in storage, and is an essential supply for any long voyage, the ability to produce more fresh water in mid-ocean is important for any ship. Early evaporators on sailing vessels Although distillers are often associated with steam ships, their use pre-dates this. Obtaining fresh water from seawater is a theoretically simple system that, in practice, presented many difficulties. While there are numerous effective methods today, early desalination efforts had low yields and often could not produce potable water. At first, only larger warships and some exploratory ships were fitted with distilling apparatus: a warship's large crew naturally needed a large supply of water, more than they could stow on board in advance. Cargo ships, with their smaller crews, merely carried their supplies with them. A se ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
HMS Belfast - Engine Room - Evaporator
HMS or hms may refer to: Education * Habib Medical School, of the Islamic University in Uganda * Hartley–Melvin–Sanborn Community School District of Iowa, United States * Harvard Medical School of Harvard University * Heidelberg Middle School, a former American school in Heidelberg, Germany * Hongwanji Mission School, in Hawaii, United States * Horley Methodist School, Teluk Intan, in Malaysia Medicine and science * Hartford Medical Society, an American professional association based in Hartford, Connecticut *Health management system * Hexose monophosphate shunt, an alternative name for the pentose phosphate pathway * Highly migratory species, a classification of fish * Hypermobility spectrum disorder, formerly hypermobility syndrome or HMS * HMS, a brand name of medrysone Technology *Huawei Mobile Services, proprietary apps and services from Huawei bundled with Android devices * HMS Networks, a company in the field of industrial communications * Heavy melting steel * H ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Boiler Feedwater
Boiler feedwater is the water which is supplied to a boiler. The feed water is put into the steam drum from a feed pump. In the steam drum the feed water is then turned into steam from the heat. After the steam is used, it is then dumped to the main condenser. From the condenser, it is then pumped to the deaerated feed tank. From this tank it then goes back to the steam drum to complete its cycle. The feedwater is never open to the atmosphere. This cycle is known as a closed system or Rankine cycle. History of feedwater treatment During the early development of boilers, water treatment was not so much of an issue, as temperatures and pressures were so low that high amounts of scale and rust would not form to such a significant extent, especially if the boiler was “boiler blowdown, blown down”. It was general practice to install zinc plates and/or alkaline chemicals to reduce corrosion within the boiler. Many tests had been performed to determine the cause (and possible protec ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Glossary Of Boiler Terminology
Boilers for generating steam or hot water have been designed in countless shapes, sizes and configurations. An extensive terminology has evolved to describe their common features. This glossary provides definitions for these terms. Terms which relate solely to boilers used for space heating or generating hot water are identified by (HVAC). A-B ; : A container beneath the furnace, catching ash and clinker that falls through the #Firebar, firebars. This may be made of brickwork for a stationary boiler, or steel sheet for a locomotive. Ashpans are often the location of the #Damper, damper. They may also be shaped into hoppers, for easy cleaning during #Disposal, disposal. ; Blastpipe: Part of the exhaust system that discharges exhaust steam from the cylinders into the smokebox beneath the chimney in order to increase the draught through the fire. ; Boiler blowdown, Blow-down: Periodic venting of water from the boiler. This water contains the most concentrated precursors for #Sl ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
G & J Weir
The Weir Group plc is a Scottish multinational engineering company headquartered in Glasgow, Scotland. It is listed on the London Stock Exchange and is a constituent of the FTSE 100 Index. History The company was established in 1871 as an engineering firm by two brothers, George and James Weir, founding G. & J. Weir Ltd. The Weir brothers produced numerous groundbreaking inventions in pumping equipment, primarily for the Clyde shipyards and the steam ships built there. These pumps became extremely well known for their use as boiler feedwater pumps, and for ship's auxiliary equipment such as evaporators. During 1886, the company established a new machine shop in Cathcart alongside a recently extended railway line. Under the leadership of W D Weir, the company turned to producing munitions and war materiel during the First World War. In addition to shells, it manufactured aero-engines and whole aircraft, including the Royal Aircraft Factory F.E.2 fighter and bomber. By the end ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ejector
A vacuum ejector, or simply ejector, or aspirator, is a type of vacuum pump, which produces vacuum by means of the Venturi effect. In an ejector, a working fluid (liquid or gaseous) flows through a jet nozzle into a tube that first narrows and then expands in cross-sectional area. The fluid leaving the jet is flowing at a high velocity which due to Bernoulli's principle results in it having low pressure, thus generating a vacuum. The outer tube then narrows into a mixing section where the high velocity working fluid mixes with the fluid that is drawn in by the vacuum, imparting enough velocity for it to be ejected, the tube then typically expands in order to decrease the velocity of the ejected stream, allowing the pressure to smoothly increase to the external pressure. The strength of the vacuum produced depends on the velocity and shape of the fluid jet and the shape of the constriction and mixing sections, but if a liquid is used as the working fluid, the strength of the va ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
British Admiralty
The Admiralty was a Departments of the Government of the United Kingdom, department of the Government of the United Kingdom that was responsible for the command of the Royal Navy. Historically, its titular head was the Lord High Admiral of the United Kingdom, Lord High Admiral – one of the Great Officers of State. For much of its history, from the early Admiralty in the 18th century, 18th century until its abolition, the role of the Lord High Admiral was almost invariably put "in commission" and exercised by the Lords Commissioner of the Admiralty, who sat on the governing Board of Admiralty, rather than by a single person. The Admiralty was replaced by the Admiralty Board (United Kingdom), Admiralty Board in 1964, as part of the reforms that created the Ministry of Defence (United Kingdom), Ministry of Defence and its Navy Department (Ministry of Defence), Navy Department (later Navy Command (Ministry of Defence), Navy Command). Before the Acts of Union 1707, the Office of t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Two Of The Evaporators, Fig 68 (The Shipbuilder Special Numbers Olympic)
2 (two) is a number, numeral and digit. It is the natural number following 1 and preceding 3. It is the smallest and the only even prime number. Because it forms the basis of a duality, it has religious and spiritual significance in many cultures. Mathematics The number 2 is the second natural number after 1. Each natural number, including 2, is constructed by succession, that is, by adding 1 to the previous natural number. 2 is the smallest and the only even prime number, and the first Ramanujan prime. It is also the first superior highly composite number, and the first colossally abundant number. An integer is determined to be even if it is divisible by two. When written in base 10, all multiples of 2 will end in 0, 2, 4, 6, or 8; more generally, in any even base, even numbers will end with an even digit. A digon is a polygon with two sides (or edges) and two vertices. Two distinct points in a plane are always sufficient to define a unique line in a nontrivial ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Trunk Engine
A marine steam engine is a steam engine that is used to power a ship or boat. This article deals mainly with marine steam engines of the reciprocating type, which were in use from the inception of the steamboat in the early 19th century to their last years of large-scale manufacture during World War II. Reciprocating steam engines were progressively replaced in marine applications during the 20th century by steam turbines and marine diesel engines. History The first commercially successful steam engine was developed by Thomas Newcomen in 1712. The steam engine improvements brought forth by James Watt in the later half of the 18th century greatly improved steam engine efficiency and allowed more compact engine arrangements. Successful adaptation of the steam engine to marine applications in England would have to wait until almost a century after Newcomen, when Scottish engineer William Symington built the world's "first practical steamboat", the '' Charlotte Dundas'', in 1802. Ri ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Paddle Steamer
A paddle steamer is a steamship or steamboat powered by a steam engine driving paddle wheels to propel the craft through the water. In antiquity, paddle wheelers followed the development of poles, oars and sails, whereby the first uses were wheelers driven by animals or humans. In the early 19th century, paddle wheels were the predominant way of propulsion for steam-powered boats. In the late 19th century, paddle propulsion was largely superseded by the propeller, screw propeller and other marine propulsion systems that have a higher efficiency, especially in rough or open water. Paddle wheels continue to be used by small, pedal-powered paddle boats and by some ships that operate tourist voyages. The latter are often powered by diesel engines. Paddle wheels The paddle wheel is a large steel framework wheel. The outer edge of the wheel is fitted with numerous, regularly spaced paddle blades (called floats or buckets). The bottom quarter or so of the wheel travels under wate ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Evaporator
An evaporator is a type of heat exchanger device that facilitates evaporation by utilizing conductive and convective heat transfer, which provides the necessary thermal energy for phase transition from liquid to vapour. Within evaporators, a circulating liquid is exposed to an atmospheric or reduced pressure environment causing it to boil at a lower temperature compared to normal atmospheric boiling. The four main components of an Evaporator (marine), evaporator assembly are: Heat is transferred to the liquid inside the tube walls via conduction providing the thermal energy needed for evaporation. Convection, Convective currents inside it also contribute to heat transfer efficiency. There are various evaporator designs suitable for different applications including shell and tube, plate, and flooded evaporators, commonly used in industrial processes such as desalination, power generation and air conditioning. Plate-type evaporators offer compactness while multi-stage designs ena ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Deaereating Feed Tank
A deaerating feed tank (DFT), often found in steam plants that propel ships, is located after the main condensate pump and before the main feed booster pump. Purpose It has these three purposes: # Remove dissolved oxygen (“air”) from the condensate # Pre-heat the feedwater # Provide a storage/surge volume Based on the relevant theoretical Rankine cycle diagram, there are four main processes, or stages: *Stages 1→2: Water pressure is raised from low to high by one or more pumps. *Stages 2→3: Water is heated to boiling in either a conventional boiler or a nuclear propulsion steam generator *Stages 3→4: Steam is expanded in the steam turbine to turn the ship's propeller and power the ship's turbine generators. *Stages 4→1: Low pressure wet steam leaving the turbine is condensed in the ( condenser. A high vacuum in the condenser improves efficiency. In the practical implementation of a Rankine cycle, it is common to break the pump process (stages 1→2) into three pumps ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Surface Condenser
A surface condenser is a water-cooled shell and tube heat exchanger installed to condense exhaust steam from a steam turbine in thermal power stations. These Condenser (heat transfer), condensers are heat exchangers which convert steam from its gaseous to its liquid state at a pressure below atmospheric pressure. Where cooling water is in short supply, an air-cooled condenser is often used. An air-cooled condenser is however, significantly more expensive and cannot achieve as low a steam turbine exhaust pressure (and temperature) as a water-cooled surface condenser. Surface condensers are also used in applications and industries other than the condensing of steam turbine exhaust in power plants. Purpose In thermal power plants, the purpose of a surface condenser is to condensation, condense the exhaust steam from a steam turbine to obtain maximum Thermal efficiency, efficiency, and also to convert the turbine exhaust steam into pure water (referred to as steam condensate) so tha ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
