The history of the steam engine stretches back as far as the 1st century AD; the first recorded rudimentary steam engine being the aeolipile described by Hero of Alexandria.[1] Over a millennium after Hero’s (or “Heron’s”) experiments, a number of steam-powered devices were experimented with or proposed, but it was not until 1712 that a commercially successful steam engine was finally developed, Thomas Newcomen’s atmospheric engine. During the industrial revolution, steam engines became the dominant source of power and remained so into the early decades of the 20th century, when advances in the design of the electric motor and the internal combustion engine resulted in the rapid replacement of the steam engine by these technologies. However, the steam turbine, an alternative form of steam engine, has become the most common method by which electrical power generators are driven. Investigations are being made into the practicalities of reviving the reciprocating steam engine as the basis for a new wave of ‘advanced steam technology’ .Contents [hide]
1 Precursors
1.1 Early uses of steam power
1.2 Cylinders
1.3 The first industrial engines
2 Low-pressure engines
2.1 Newcomen “atmospheric” engine
2.2 Polzunov’s engine
2.3 Watt’s separate condenser
2.4 Watt double-acting and rotative engines
3 High-pressure engines
3.1 The Cornish engine and compounding
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Nuclear Power has its advantages and disadvantages. However it is a lot safer than most people think. The chances of a meltdown or a radiation leak are extremely small. There are many safety features, which make nuclear power one of the safest electricity sources. And every nuclear power plant is protected with thick layers of steel and concrete. Nuclear power is also very environmentally ...
4 Later development
5 References
6 Bibliography
7 Further reading
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Precursors
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Early uses of steam power
See also: Aeolipile and Steam jack
Aeolipile.
The earliest known rudimentary steam engine and reaction steam turbine, the aeolipile, is described by a Greek mathematician and engineer named Hero of Alexandria (Heron) in 1st century Roman Egypt, as recorded in his manuscript Spiritalia seu Pneumatica.[2][3] Steam ejected tangentially from nozzles caused a pivoted ball to rotate. Its thermal efficiency was low. This suggests that the conversion of steam pressure into mechanical movement was known in Roman Egypt in the 1st century. Hero also devised a machine that used air heated in an altar fire to displace a quantity of water from a closed vessel. The weight of the water was made to pull a hidden rope to operate temple doors.[3][4] Some historians have conflated the two inventions to assert, incorrectly, that the aeolipile was capable of useful work.
According to William of Malmesbury, in 1125, Reims was home to a church that had an organ powered by air escaping from compression “by heated water”, apparently designed and constructed by professor Gerbertus.[3][5]
Among the papers of Leonardo da Vinci dating to the late 15th century is the design for a steam-powered cannon called the Architonnerre which works by the sudden influx of hot water into a sealed red hot cannon.[6]
A rudimentary impact steam turbine was described in 1551 by Taqi al-Din, a philosopher, astronomer and engineer in 16th century Ottoman Egypt, who described a method for rotating a spit by means of a jet of steam playing on rotary vanes around the periphery of a wheel. A similar device for rotating a spit was also later described by John Wilkins in 1648.[7] These devices were then called “mills” but are now known as steam jacks. Another similar rudimentary steam turbine is shown by Giovanni Branca, an Italian engineer, in 1629 for turning a cylindrical escapement device that alternately lifted and let fall a pair of pestles working in mortars.[8] The steam flow of these early steam turbines, however, was not concentrated and most of its energy was dissipated in all directions. This would have led to a great waste of energy and so they were never seriously considered for industrial use.
The Essay on Freshwater Industry Water Power Agriculture
Freshwater only makes up a tiny portion of the earth's total water and yet it is as important to our economy and industry as it is to our bodies to stay alive. Industry is the second largest with drawer of water only behind agriculture. There are many aspects of freshwater industry ranging from power generation to fishing. There are two main categories freshwater industry can be split into and ...
In 1605 French mathematician Florence Rivault in his treatise on artillery wrote on his discovery that water, if confined in a bombshell and heated, would explode the shells.[9]
In 1606, Jerónimo de Ayanz y Beaumont demonstrated and was granted a patent for a steam powered water pump.
In 1663 Edward Somerset, 2nd Marquess of Worcester published designs for raising water between floors employing a similar principle to that of a coffee percolator. His system was the first to separate the boiler from the pumping action. Water was admitted into a reinforced barrel from a cistern, and then a valve was opened to admit steam from a separate boiler. The pressure built over the top of the water, driving it up a pipe.[10] He installed his steam-powered device on the wall of the Great Tower at Raglan Castle to supply water through the tower. The grooves in the wall where the engine was installed were still to be seen in the 19th century. However, no one was prepared to risk money for such a revolutionary concept, and without backers the machine remained undeveloped.[11]
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Cylinders
Denis Papin’s design for a piston-and-cylinder engine, 1680.
In the mid 1670s Denis Papin collaborated with the Dutch physicist Christiaan Huygens on an engine which drove out the air from a cylinder by exploding gunpowder inside it. Realising the incompleteness of the vacuum produced by this means and on moving to England in 1680, Papin devised a version of the same cylinder that obtained a more complete vacuum from boiling water and then allowing the steam to condense; in this way he was able to raise weights by attaching the end of the piston to a rope passing over a pulley. As a demonstration model the system worked, but in order to repeat the process the whole apparatus had to be dismantled and reassembled. Papin quickly saw that to make an automatic cycle the steam would have to be generated separately in a boiler; however as he did not take the project further all we can say is that he invented the reciprocating steam engine conceptually and thus paved the way to Newcomen’s engine. Papin also designed a paddle boat driven by a jet playing on a mill-wheel in a combination of Taqi al Din and Savery’s conceptions and he is also credited with a number of significant devices such as the safety valve. Papin’s years of research into the problems of harnessing steam was to be play a key part in the development of the first successful industrial engines that soon followed his death.
The Essay on Biomass Steam Boiler Water-Steam System
Biomass steam boiler water-steam system In the process of biomass steam boiler use,we should pay special attention to its water-steam system to ensure the stable steam generating.Biomass steam boiler water-steam system is to absorb the heat fuel released,make the water eventually become the steam of specified pressure and temperature,it consists of drum,water wall,superheater,reheater, down ...
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The first industrial engines
Main article: Thomas Savery
The first steam engine to be applied industrially was the “fire-engine” or “Miner’s Friend”, designed by Thomas Savery in 1698. This was a pistonless steam pump, similar to the one developed by Worcester. Savery made two key contributions that greatly improved the practicality of the design. First, in order to allow the water supply to be placed below the engine, he used condensed steam to produce a partial vacuum in the pumping reservoir (the barrel in Worcester’s example), and using that to pull the water upward. Secondly, in order to rapidly cool the steam to produce the vacuum, he ran cold water over the reservoir.
Operation required several valves; when the reservoir was empty at the start of a cycle a valve was opened to admit steam. The valve was closed to seal the reservoir and the cooling water valve turned on to condense the steam and create a partial vacuum. A supply valve was opened, pulling water upward into the reservoir, and the typical engine could pull water up to 20 feet.[12] This was closed and the steam valve reopened, building pressure over the water and pumping it upward, as in the Worcester design. The cycle essentially doubled the distance that water could be pumped for any given pressure of steam, and production examples raised water about 40 feet.[12]
Savery’s engine solved a problem that had only recently become a serious one; raising water out of the mines in southern England as they reached greater depths. But the engine was expensive and apparently not very efficient; nor was it very safe because part of its cycle required steam under pressure supplied by a boiler, and given the technology of the period the pressure vessel could not be made strong enough and so was prone to explosion.[13] Nevertheless, The explosion of one of his pumps at Broad Waters (near Wednesbury), about 1705, probably marks the end of attempts to exploit his invention.[14]
The Essay on Water 5
Thesis Statement: Water is the most crucial part of life its self, and must never go unnoticed. I. People frequently overlook the importance of water in the body. In order to keep the body healthy, people must consume water. A healthy body is a well-hydrated body. Without the constant consumption of water the body becomes dehydrated. Perhaps people overlook waters importance, simply because its ...
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Low-pressure engines
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Newcomen “atmospheric” engine
Engraving of Newcomen engine. This appears to be copied from a drawing in Desaguliers’ 1744 work: “A course of experimental philosophy”, itself believed to have been a reversed copy of Henry Beighton’s engraving dated 1717, that may represent what is probably the second Newcomen engine erected around 1714 at Griff colliery, Warwickshire.[15]
It was Thomas Newcomen with his “atmospheric-engine” of 1712 who can be said to have brought together most of the essential elements established by Papin in order to develop the first practical steam engine for which there could be a commercial demand. This took the shape of a reciprocating beam engine installed at surface level driving a succession of pumps at one end of the beam. The engine, attached by chains from other end of the beam, worked on the atmospheric, or vacuum principle.[16]
Newcomen’s design used some elements of earlier concepts. Like the Savery design, Newcomen’s engine used steam, cooled with water, to create a vacuum. Unlike Savery’s pump, however, Newcomen used the vacuum to pull on a piston instead of pulling on water directly. The upper end of the cylinder was open to the atmospheric pressure, and when the vacuum formed, the atmospheric pressure above the piston pushes it down into the cylinder. The piston was lubricated by a trickle of water from the same cistern that supplied the cooling water. Further, to improve the cooling effect, he sprayed water directly into the cylinder.
The piston was attached by a chain to a large pivoted beam. When the piston pulled the beam, the other side of the beam was pulled upward. This end was attached to a rod that pulled on a series of conventional pump handles in the mine. At the end of this power stroke, the steam valve was reopened, and the weight of the pump rods pulled the beam down, lifting the piston and drawing steam into the cylinder again.
Using the piston and beam allowed the Newcomen engine to power pumps at different levels throughout the mine, as well as eliminating the need for any high pressure steam. The entire system was isolated to a single building on the surface. Although inefficient and extremely heavy on coal (compared to later engines), these engines raised far greater volumes of water and from greater depths than had previously been possible.[13] Over 100 Newcomen engines were installed around England by 1735, and it is estimated that as many as 2,000 were in operation by 1800 (including Watt versions).
The Essay on Steam Engines Engine Railroads Watt
... Steam Engine The steam engine provided a landmark in the industrial development of Europe. The first modern steam engine was built by an engineer, Thomas Newcomen, ... steam in the cylinder and then condensed it with a spray of cold water; the vacuum created allowed atmospheric pressure ... liberated from the stream side. A Watt engine drove Robert Fulton's experimental steam vessel Clermont up the Hudson ...
John Smeaton made numerous improvements to the Newcomen engine, notably the seals, and by improving these was able to almost triple their efficiency. He also preferred to use wheels instead of beams for transferring power off of the cylinder, which made his engines more compact. Smeaton was the first to develop a rigorous theory of steam engine design of operation. He worked backward from the intended role to calculate the amount of power that would be needed for the task, the size and speed of a cylinder that would provide it, the size of boiler needed to feed it, and the amount of fuel it would consume. These were developed empirically after studying dozens of Newcomen engines in Cornwall and Newcastle, and building an experimental engine of his own at his home in Austhorpe in 1770. By the time the Watt engine was introduced only a few years later, Smeaton had built dozens of ever-larger engines into the 100 hp range.[17]
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Polzunov’s engine
Polzunov’s two-cylinder steam engine.
In 1763, the Russian inventor Ivan Polzunov proposed the first two-cylinder steam engine. It was rated at 1.8 hp (1.2 kW),[18] and was probably the first steam engine in Russia. He later developed an engine for driving bellows at a steelworks, rated at 32 hp (24 kW) – much more powerful than the contemporary atmospheric engines from England; however Polzunov died just as the engine was completed, and after three months running there was no one available with the knowledge to repair it, so it was replaced by a more conventional power source, despite paying off its costs in this three months. A working model of the steam machine made by Ivan Polzunov is in the museum of Barnaul and still works. Polzunov’s achievements were not recognised at the time and his innovations did not influence the later development of the steam engine.
The Essay on High School Drop out Rate
Analysts agree that the rate of high school dropout in the United States has reached catastrophic levels. Credible estimates claim that more than a third of all students that join high school are likely to abandon school before completion. A look at the past decades indicates that this has been a growing trend and is yet to be arrested appropriately. This is a problem that has not been captured in ...
[edit]
Watt’s separate condenser
Early Watt pumping engine.
While working at the University of Glasgow as an instrument maker and repairman, James Watt was introduced to the power of steam by Professor John Robison. Fascinated, Watt took to reading everything he could on the subject, and independently developed the concept of latent heat, only recently published by Joseph Black at the same university. When Watt learned that the University owned a small working model of Newcomen engine, he pressed to have it returned from London where it was being unsuccessfully repaired. Watt repaired the machine, but found it was barely functional even when fully repaired.
After working with the design, Watt concluded that 80% of the steam used by the engine was wasted. Instead of providing motive force, it was instead being used to heat the cylinder. In the Newcomen design, every power stroke was started with a spray of cold water, which not only condensed the steam, but also cooled the walls of the cylinder. This heat had to be replaced before the cylinder would accept steam again. In the Newcomen engine the heat was supplied only by the steam, so when the steam valve was opened again the vast majority condensed on the cold walls as soon as it was admitted to the cylinder. It took a considerable amount of time and steam before the cylinder warmed back up and the steam started to fill it up.
Watt solved the problem of the water spray by removing the cold water to a different cylinder, placed beside the power cylinder. Once the power stroke was complete a valve was opened between the two, and any steam that entered the cylinder would condense inside this cold cylinder. This would create a vacuum that would pull more of the steam into the cylinder, and so on until the steam was mostly condensed. The valve was then closed, and operation of the main cylinder continued as it would on a conventional Newcomen engine. As the power cylinder remained at operational temperature throughout, the system was ready for another stroke as soon as the piston was pulled back to the top. Maintaining the temperature was a jacket around the cylinder where steam was admitted. Watt produced a working model in 1765.
Convinced that this was a great advance, Watt entered into partnerships to provide venture capital while he worked on the design. Not content with this single improvement, Watt worked tirelessly on a series of other improvements to practically every part of the engine. Watt further improved the system by adding a small vacuum pump to pull the steam out of the cylinder into the condenser, further improving cycle times. A more radical change from the Newcomen design was closing off the top of the cylinder and introducing low pressure steam above the piston. Now the power was not due to the difference of atmospheric pressure and the vacuum, but the pressure of the steam and the vacuum, a somewhat higher value. On the upward return stroke, the steam on top was transferred through a pipe to the underside of the piston ready to be condensed for the downward stroke. Sealing of the piston on a Newcomen engine had been achieved by maintaining a small quantity of water on its upper side. This was no longer possible in Watt’s engine due to the presence of the steam. Watt spent considerable effort to find a seal that worked, eventually obtained by using a mixture of tallow and oil. The piston rod also passed through a gland on the top cylinder cover sealed in a similar way.[19]
He finally considered the design good enough to release in 1774, and the Watt engine was released to the market. As portions of the design could be easily fitted to existing Newcomen engines, there was no need to build an entirely new engine at the mines. Instead, Watt and Boulton licensed the improvements to engine operators, charging them a portion of the money they would save in reduced fuel costs. The design was wildly successful, and the Boulton and Watt company was formed to license the design and help new manufacturers build the engines. The two would later open the Soho Foundry to produce engines of their own.
Watt never ceased improving his designs. This further improved the operating cycle speed, introduced governors, automatic valves, double-acting pistons, a variety of rotary power takeoffs and many other improvements. Watt’s technology enabled the widespread commercial use of stationary steam engines.[20]
Humphrey Gainsborough produced a model condensing steam engine in the 1760s, which he showed to Richard Lovell Edgeworth, a member of the Lunar Society. Gainsborough believed that Watt had used his ideas for the invention;[21] however James Watt was not a member of the Lunar Society at this period and his many accounts explaining the succession of thought processes leading to the final design would tend to belie this story.
Power was still limited by the low pressure, the displacement of the cylinder, combustion and evaporation rates and condenser capacity. Maximum theoretical efficiency was limited by the relatively low temperature differential on either side of the piston; this meant that for a Watt engine to provide a usable amount of power, the first production engines had to be very large, and were thus expensive to build and install.
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Watt double-acting and rotative engines
For more details on this topic, see Rotative beam engine.
Boulton & Watt developed the reciprocating engine into the rotative type. Unlike the Newcomen engine, the Watt engine could operate smoothly enough to be connected to a drive shaft – via sun and planet gears – to provide rotary power along with double-acting condensing cylinders. The earliest example was built as a demonstrator and was installed in Boulton’s factory to work machines for lapping (polishing) buttons or similar. For this reason it was always known as the “Lap engine”.[22][23] In early steam engines the piston is usually connected by a rod to a balanced beam, rather than directly to a flywheel, and these engines are therefore known as beam engines. This was in all essentials the steam engine that we know today.
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High-pressure engines
As the 18th century advanced, the call was for higher pressures; this was strongly resisted by Watt who used the monopoly his patent gave him to prevent others from building high-pressure engines and using them in vehicles. He mistrusted the materials’ resistance and the boiler technology of the day.
The main difference between how high-pressure and low-pressure steam engines work is the source of the force that moves the piston. In Newcomen’s and Watt’s engines, it is the condensation of the steam that creates most of the pressure difference, causing atmospheric pressure (Newcomen) or low-pressure steam (Watt) to push the piston; the internal pressures never greatly exceed atmospheric pressure. In a high-pressure engine, most of the pressure difference is provided by the high pressure steam from the boiler; the low pressure side of the piston may be at atmospheric pressure or, if it is connected to a condenser, this only provides a small proportion of the pressure difference.
The first known advocate of “strong steam” was Jacob Leupold in his scheme for an engine that appeared in encyclopaedic works from around 1725. Various projects for steam propelled boats and vehicles also appeared throughout the century one of the most promising being Nicolas-Joseph Cugnot’s who demonstrated his “fardier” (steam wagon), in 1769. Whilst the working pressure used for this vehicle is unknown, the small size of the boiler gave insufficient steam production rate to allow the fardier to advance more than a few hundred metres at a time before having to stop to raise steam. Other projects and models were proposed, but as with William Murdoch’s model of 1784, many were blocked by Boulton and Watt.
This did not apply in the USA, and in 1788 a steamboat built by John Fitch operated in regular commercial service along the Delaware river between Philadelphia PA and Burlington NJ, carrying as many as 30 passengers. This boat could typically make 7 to 8 miles per hour, and traveled more than 2,000 miles (3,200 km) during its short length of service. The Fitch steamboat was not a commercial success, as this route was adequately covered by relatively good wagon roads. In 1802 William Symington built a practical steamboat, and in 1807 Robert Fulton used a Watt steam engine to power the first commercially successful steamboat.
Oliver Evans in his turn was in favour of “strong steam” which he applied to boat engines and to stationary uses. He was a pioneer of cylindrical boilers; however Evans’ boilers did suffer several serious boiler explosions, which tended to lend weight to Watt’s qualms. He founded the Pittsburgh Steam Engine Company in 1811 in Pittsburgh, Pennsylvania.[24] The company introduced high-pressure steam engines to the riverboat trade in the Mississippi watershed.
The importance of raising steam under pressure (from a thermodynamic standpoint) is that it attains a higher temperature. Thus, any engine using high pressure steam operates at a higher temperature and pressure differential than is possible with a low pressure vacuum engine. The high pressure engine thus became the basis for most further development of reciprocating steam technology. Even so, around the year 1800, “high pressure” amounted to what today would be considered very low pressure, i.e. 40-50 psi (276-345 kPa), the point being that the high pressure engine in question was non-condensing, driven solely by the expansive power of the steam, and once that steam had performed work it was usually exhausted at higher-than-atmospheric pressure. The blast of the exhausting steam into the chimney could be exploited to create induced draught through the fire grate and thus increase the rate of burning, hence creating more heat in a smaller furnace, at the expense of creating back pressure on the exhaust side of the piston. The most important outcome was that engines could be made much smaller than previously for a given power output. There was thus the potential for steam engines to be developed that were small and powerful enough to propel themselves and other objects. As a result, steam power for transportation now became a practicality in the form of ships and land vehicles, which revolutionised cargo businesses, travel, military strategy, and essentially every aspect of society.
On February 21, 1804 at the Penydarren ironworks at Merthyr Tydfil in South Wales, the first self-propelled railway steam engine or steam locomotive, built by Richard Trevithick, was demonstrated.[25]
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The Cornish engine and compounding
Main article: Cornish steam engine
Trevithick pumping engine (Cornish system).
Around 1811 Richard Trevithick was required to update a Watt pumping engine in order to adapt it to one of his new large cylindrical Cornish boilers. When Trevithick left for South America in 1816, his improvements were continued by William Sims. In a parallel, Arthur Woolf developed a compound engine with two cylinders, so that steam expanded in a high pressure cylinder before being released into a low pressure one. Efficiency was further improved by Samuel Groase, who insulated the boiler, engine, and pipes.[26]
Steam pressure above the piston was increased eventually reaching 40 psi (0.28 MPa) or even 50 psi (0.34 MPa) and now provided much of the power for the downward stroke; at the same time condensing was improved. This considerably raised efficiency and further pumping engines on the Cornish system (often known as Cornish engines) continued to be built new throughout the 19th century. Older Watt engines were updated to conform.
The take-up of these Cornish improvements was slow in textile manufacturing areas where coal was cheap, due to the higher capital cost of the engines and the greater wear that they suffered. The change only began in the 1830s, usually by compounding through adding an additional (high pressure) cylinder.[27]
Many of these engines were supplied worldwide and gave reliable and efficient service over a great many years with greatly reduced coal consumption. Some of them were very large and the type continued to be built right down to the 1890s.
