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Skinner Unaflow Engine
The uniflow type of steam engine uses steam that flows in one direction only in each half of the cylinder. Thermal efficiency is increased by having a temperature gradient along the cylinder. Steam always enters at the hot ends of the cylinder and exhausts through ports at the cooler centre. By this means, the relative heating and cooling of the cylinder walls is reduced. Steam entry is usually controlled by poppet valves (which act similarly to those used in internal combustion engines) that are operated by a camshaft. The inlet valves open to admit steam when minimum expansion volume has been reached at the start of the stroke. For a period of the crank cycle, steam is admitted, and the poppet inlet is then closed, allowing continued expansion of the steam during the stroke, driving the piston. Near the end of the stroke, the piston will uncover a ring of exhaust ports mounted radially around the centre of the cylinder
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Marine Steam 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. An annular engine is an unusual type of engine that has an annular (ring-shaped) cylinder.[44] Some of American pioneering engineer James P. Allaire's early compound engines were of the annular type, with a smaller, high-pressure cylinder placed in the centre of a larger, ring-shaped low-pressure cylinder.[44] Some of American pioneering engineer James P
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Chaplin's Patent Distilling Apparatus
The Chaplin's patent distilling apparatus with Steam pump for circulating water attached was an early design of an evaporator, a device for producing fresh water on board ship by distillation of seawater. An example of this apparatus has been recovered from the wreck of SS Xantho (1872),[1] an auxiliary steamship used in Australia to transport passengers and trade goods before ultimately sinking in Port Gregory, Western Australia in 1872. It is purported[by whom?] that the Alexander Chaplin distiller from the Xantho wreck is the only known surviving example of a Chaplin distilling apparatus on board a vessel of this period. Alexander Chaplin & Co. (also known as A.C. and Co., Alex
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Qianli Chuan
Qianli chuan (Chinese: 千里船; pinyin: qiānlǐchuán; lit. 'thousand league boat'[1][2]) were paddle wheel boats used in medieval China. The boats were driven by human pedaling and were able to cruise hundreds of kilometers per day with no wind blowing.[1] Qianli chuan were invented in the late 5th century AD during the Southern Qi Dynasty and the invention is attributed to the ancient Chinese astronomer and mathematician Zu Chongzhi.[1][3][2][4] References made to the boat were made recalling various tests on the Xinting River, south of modern Nanjing
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Steam Generator (auxiliary Boiler)
A steam generator on a ship is an auxiliary boiler which draws high-pressure superheated steam from the vessel's propulsion system[1] to generate low pressure saturated steam. This secondary steam is then used to power auxiliary shipboard engines driving winches or pumps, or to meet any steam requirement that does not require superheating, such as boiler feedwater and freshwater evaporators. A typical generator uses inlet steam supplied at 600 psi to produce around 10,000 lb/hour at around 120 psi.[2] It is constructed as a cylindrical steel pressure vessel, either horizontal or vertical, containing a series of heating coils. The design bears a strong resemblance to a marine evaporator, though simpler, as it uses treated feedwater, rather than scale-producing raw seawater.
  1. ^ "10: Steam Systems". Naval Marine Engineering Practice
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Steam Generator (boiler)
A steam generator is a form of low water-content boiler, similar to a flash steam boiler. The usual construction is as a spiral coil of water-tube, arranged as a single, or monotube, coil. Circulation is once-through and pumped under pressure, as a forced-circulation boiler.[1] The narrow-tube construction, without any large-diameter drums or tanks, means that they are safe from the effects of explosion,[note 1] even if worked at high pressures.[2] The pump flowrate is adjustable, according to the quantity of steam required at that time. The burner output is throttled to maintain a constant working temperature
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