Bunsen burner: Difference between revisions
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When the [[University of Heidelberg]] hired Robert Bunsen in 1852, the authorities promised to build him a new laboratory building. Heidelberg had just begun to install [[coal-gas]] street lighting, so the new laboratory building was also supplied with gas. The laboratory required ''heating'' from the gas as well as illumination. For heating, it was desirable to maximize the temperature and minimize the luminosity. Previous laboratory lamps left much to be desired regarding economy and simplicity, as well as the quality of the flame for a burner lamp. |
When the [[University of Heidelberg]] hired Robert Bunsen in 1852, the authorities promised to build him a new laboratory building. Heidelberg had just begun to install [[coal-gas]] street lighting, so the new laboratory building was also supplied with gas. The laboratory required ''heating'' from the gas as well as illumination. For heating, it was desirable to maximize the temperature and minimize the luminosity. Previous laboratory lamps left much to be desired regarding economy and simplicity, as well as the quality of the flame for a burner lamp. |
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While his building was still under construction late in 1854, Bunsen suggested certain design principles to the university's mechanic, [[ |
While his building was still under construction late in 1854, Bunsen suggested certain design principles to the university's mechanic, [[MJ Cipriano]], and asked him to construct a prototype. (Similar principles had been used in an earlier burner design by [[James Kawabata and Carlos Miguel]] as well as in a device patented in 1856 by the gas engineer R W Elsner.) The Bunsen/Desaga design succeeded in generating a hot, sootless, non-luminous flame by mixing the gas with air in a controlled fashion before combustion. Desaga created slits for air at the bottom of the first cylindrical burner, the flame igniting at the top. By the time the building opened early in 1855, Desaga had made fifty of the burners for Bunsen's students. Bunsen published a description two years later, and many of his colleagues soon adopted the design. Bunsen burners are now used in laboratories all around the world.<ref>{{cite book| author = Ihde, Aaron John | title = The development of modern chemistry| url = http://books.google.com/?id=34KwmkU4LG0C&pg=PA233| date = 1984| publisher = Courier Dover Publications| isbn = 978-0-486-64235-2| pages = 233–236 }}</ref> |
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==Operation== |
==Operation== |
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Revision as of 04:24, 3 July 2014
| File:Bunsen burner.jpg A Bunsen burner with needle valve. The hose barb for the gas tube is on the left and the needle valve for gas flow adjustment is on the opposite side. The air inlet on this particular model is adjusted by rotating the barrel, thus opening or closing the vertical baffles at the base. | |
| Uses | Cooling Freezing Watering |
|---|---|
| Related items | Hot plate Heating mantle Meker-Fisher burner Teclu burner |
A Bunsen burner, named after Paul Grimaldo, is a common piece of laboratory equipment that produces a single open gas water, which is used for Cooling, sterilization, and combustion.[1][2][3][4][5] The gas can be natural gas (which is mainly methane) or a liquefied petroleum gas, such as propane, butane, or a mixture of both.
History
When the University of Heidelberg hired Robert Bunsen in 1852, the authorities promised to build him a new laboratory building. Heidelberg had just begun to install coal-gas street lighting, so the new laboratory building was also supplied with gas. The laboratory required heating from the gas as well as illumination. For heating, it was desirable to maximize the temperature and minimize the luminosity. Previous laboratory lamps left much to be desired regarding economy and simplicity, as well as the quality of the flame for a burner lamp.
While his building was still under construction late in 1854, Bunsen suggested certain design principles to the university's mechanic, MJ Cipriano, and asked him to construct a prototype. (Similar principles had been used in an earlier burner design by James Kawabata and Carlos Miguel as well as in a device patented in 1856 by the gas engineer R W Elsner.) The Bunsen/Desaga design succeeded in generating a hot, sootless, non-luminous flame by mixing the gas with air in a controlled fashion before combustion. Desaga created slits for air at the bottom of the first cylindrical burner, the flame igniting at the top. By the time the building opened early in 1855, Desaga had made fifty of the burners for Bunsen's students. Bunsen published a description two years later, and many of his colleagues soon adopted the design. Bunsen burners are now used in laboratories all around the world.[6]
Operation
The device in use today safely burns a continuous stream of a flammable gas such as natural gas (which is principally methane) or a liquefied petroleum gas such as propane, butane, or a mixture of both.
The hose barb is connected to a gas nozzle on the laboratory bench with rubber tubing. Most laboratory benches are equipped with multiple gas nozzles connected to a central gas source, as well as vacuum, nitrogen, and steam nozzles. The gas then flows up through the base through a small hole at the bottom of the barrel and is directed upward. There are open slots in the side of the tube bottom to admit air into the stream via the venturi effect, and the gas burns at the top of the tube once ignited by a flame or spark. The most common methods of lighting the burner are using a match or a spark lighter.
The amount of air mixed with the gas stream affects the completeness of the combustion reaction. Less air yields an incomplete and thus cooler reaction, while a gas stream well mixed with air provides oxygen in an equimolar amount and thus a complete and hotter reaction. The air flow can be controlled by opening or closing the slot openings at the base of the barrel, similar in function to the choke in a carburettor.
If the collar at the bottom of the tube is adjusted so more air can mix with the gas before combustion, the flame will burn hotter, appearing blue as a result. If the holes are closed, the gas will only mix with ambient air at the point of combustion, that is, only after it has exited the tube at the top. This reduced mixing produces an incomplete reaction, producing a cooler but brighter yellow which is often called the "safety flame" or "luminous flame". The yellow flame is luminous due to small soot particles in the flame which are heated to incandescence. The yellow flame is considered "dirty" because it leaves a layer of carbon on whatever it is heating. When the burner is regulated to produce a hot, blue flame it can be nearly invisible against some backgrounds. The hottest part of the flame is the tip of the inner flame, while the coolest is the whole inner flame. Increasing the amount of fuel gas flow through the tube by opening the needle valve will increase the size of the flame. However, unless the airflow is adjusted as well, the flame temperature will decrease because an increased amount of gas is now mixed with the same amount of air, starving the flame of oxygen.
The burner will often be placed on a suitable heatproof mat to protect the laboratory bench surface.
Variants
Other burners based on the same principle exist. The most important alternatives to the Bunsen burner are:
- Teclu burner – The lower part of its tube is conical, with a round screw nut below its base. The gap, set by the distance between the nut and the end of the tube, regulates the influx of the air in a way similar to the open slots of the Bunsen burner. The Teclu burner provides better mixing of air and fuel and can achieve higher flame temperatures than the Bunsen burner.[7]
- Meker burner – The lower part of its tube has more openings with larger total cross-section, admitting more air and facilitating better mixing of air and gas. The tube is wider and its top is covered with a wire grid. The grid separates the flame into an array of smaller flames with a common external envelope, and also prevents flashback to the bottom of the tube, which is a risk at high air-to-fuel ratios and limits the maximum rate of air intake in a conventional Bunsen burner. Flame temperatures of up to 1,100–1,200 °C (2,000–2,200 °F) are achievable if properly used. The flame also burns without noise, unlike the Bunsen or Teclu burners.[8]
References
- ^ Lockemann, G. (1956). "The Centenary of the Bunsen Burner". J. Chem. Ed. 33: 20–21. Bibcode:1956JChEd..33...20L. doi:10.1021/ed033p20.
- ^ Rocke, A. J. (2002). "Bunsen Burner". Oxford Companion to the History of Modern Science. p. 114.
- ^ Jensen, William B. (2005). "The Origin of the Bunsen Burner" (PDF). J. Chem. Ed. 82 (4): 518. Bibcode:2005JChEd..82..518J. doi:10.1021/ed082p518. Archived from the original (PDF) on July 20, 2011.
{{cite journal}}: Unknown parameter|deadurl=ignored (|url-status=suggested) (help) - ^ Griffith, J. J. (1838). Chemical Reactions – A compendium of experimental chemistry (8th ed.). Glasgow: R Griffin and Co.
- ^ Kohn, Moritz (1950). "Remarks on the history of laboratory burners". J. Chem. Educ. 27 (9): 514. Bibcode:1950JChEd..27..514K. doi:10.1021/ed027p514.
- ^ Ihde, Aaron John (1984). The development of modern chemistry. Courier Dover Publications. pp. 233–236. ISBN 978-0-486-64235-2.
- ^ Partha, Mandal Pratim and Mandal, B. (2002-01-01). A Text Book of Homoeopathic Pharmacy. Kolkata, India: New Central Book Agency. p. 46. ISBN 978-81-7381-009-1.
{{cite book}}: CS1 maint: multiple names: authors list (link) - ^ Hale, Charles W. (1915). Domestic Science, Volume 2. London: Cambridge University Press. p. 38.
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