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Because vertical furnaces stand higher than horizontal furnaces, they may not fit into some microfabrication facilities. They help to prevent dust contamination. Unlike horizontal furnaces, in which falling dust can contaminate any wafer, vertical furnaces use enclosed cabinets with air filtration systems to prevent dust from reaching the wafers.
In a vertical, cylindrical furnace, the tubes are vertical. Tubes can be vertical or horizontal, placed along the refractory wall, in the middle, etc., or arranged in cells. Studs are used to hold the insulation together and on the wall of the furnace. They are placed about 1 ft (300 mm) apart in this picture of the inside of a furnace.
The process can be carried out in a horizontal or vertical orientation, and usually involves a rotating crucible/ampoule to stir the melt. [ 1 ] The Bridgman method is a popular way of producing certain semiconductor crystals such as gallium arsenide , for which the Czochralski method is more difficult.
Based on the flow of exhaust gases, HRSGs are categorized into vertical and horizontal types. In horizontal type HRSGs, exhaust gas flows horizontally over vertical tubes whereas in vertical type HRSGs, exhaust gas flows vertically over horizontal tubes. Based on pressure levels, HRSGs can be categorized into single pressure and multi pressure.
Cornish boiler: a large horizontal stationary boiler with a single flue. cross-tube boiler: usually a vertical flued boiler with a small number of large water-carrying cross-tubes within the firebox. The term is also applied to vertical boilers with other arrangements of tubes, such as those with horizontal fire-tubes. Crosti boiler:
The large vertical blowing engine illustrated at the top was built in the 1890s by E. P. Allis Co. of Milwaukee (later to form part of Allis-Chalmers). The steam cylinder (lower) is 42 inches (1.1 m) diameter, the air cylinder (upper) 84 inches (2.1 m) and both with a stroke of 60 inches (1.5 m).
Vertical fire-tube boiler, as used in a Leyland steam wagon. A vertical fire-tube boiler or vertical multitubular boiler is a vertical boiler where the heating surface is composed of multiple small fire-tubes, arranged vertically. [1] These boilers were not common, owing to drawbacks with excessive wear in service.
A rotating furnace is a device for making solid objects which have concave surfaces that are segments of axially symmetrical paraboloids. Usually, the objects are made of glass . The furnace makes use of the fact, already known to Newton , that the centrifugal-force-induced shape of the top surface of a spinning liquid is a concave paraboloid ...
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