Acetylene Generator


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acetylene generator

[ə′sed·əl‚ēn ′jen·ə‚rād·ər]
(engineering)
A steel cylinder or tank that provides for controlled mixing of calcium carbide and water to generate acetylene.

Acetylene Generator

 

an apparatus for producing acetylene, C2H2, by decomposing calcium carbide, CaC2, with water. As a result of the reaction CaC2 + 2H2O = C2H2+ Ca(OH)2 at 20° C and 101,325 newtons per sq m (N/m2), or 760 mm of mercury (mm Hg), 235-285 liters (l) of C2H2 are obtained from 1 kg of industrial CaC2; theoretically 1 kg of CaC2 gives 370 l of C2H2. The CaC2 is decomposed to produce the acetylene in a gas generator from which the gas passes into a gas collector (gas holder).

Acetylene generators are divided into low-pressure types, with pressures no higher than 0.01 meganewton per sq m (MN/m2), or 0.1 kilogram-force per sq cm (kgf/cm2); medium-pressure types, with pressures of 0.01-0.15 MN/m2, or 0.1-1.5 kgf/cm2 (used for welding); and high-pressure types, with pressures of more than 0.15 MN/m2, or 1.5 kgf/cm2 (not generally used for welding). An acetylene generator can produce 0.8-150 cu m of acetylene per hour. Because of the danger of explosion, the generators are installed in a separate generator room, which is isolated from other factory buildings. Such generators produce acetylene that is saturated with water vapor, thus giving a lower flame temperature during welding. Consequently, for small amounts of welding the use of dissolved acetylene, which comes in steel tanks filled with a porous mass saturated with acetone, is advisable. This acetylene contains no water vapor, gives a hotter flame, and is explosion-proof.

K. K. KHRENOV

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