DE729841C - Protection against backfire and oxygen backflow with flame delay diversion - Google Patents

Description

Protection against flashback and oxygen withdrawal with flame retardation diversion according to claim 2 of patent 717 847 According to patent 717 84.7, namely according to claim 2, a tubular spiral, like those in all previously belsanntgeivorden water reservoirs, serves as a flame retardant for protection against flashback and oxygen withdrawal in a gas line and dry locks with delay diversions can be used. Such coils are expensive, heavy, and take up a large amount of space.

While with these fuses with tubular spirals. the delay through Turning on a long way is achieved, in contrast, after the Invention in diversion devices to reduce the speed of the the same rushing flame, e.g. B. insert body with fine gas passages u. Like., used. Such inserts are low in cost and weight and low volume.

According to more recent experiments, which are described in the book by Prof. J o s t »Explosions- and combustion processes in gases <: indicated from 1939 on page 96 to 100 the flame speed in pipes decreases with decreasing diameter, the More and more pipes until finally one with a finite small diameter Flame no longer propagates at all. The material of the pipe is included insignificant because the flame is not in a flat surface, but in a hemispherical shape steps forward, stops at a certain distance from the pipe wall. the So the flame becomes: not through the pipe wall, but through what is in front of it Fresh aas cooled.

° Numerous suggestions for training yaii bodies with small gas passages s t, d became known. All of these suggestions aim at the explosion flame to let cr'.ösch.en in the body. However, through many experiments it has been established that ': it is probably possible in this way the: Flamm-. to suffocate, but that The pressure loss when passing through the small openings becomes so great that with Acetvl: enanl, agen application in practice is not possible. After new attempts by the Siemens-Werk.-in Berlin, published in the Elektrotechnische Zeitschrift Heft 42, volume r938 is the gap opening required to prevent flame penetration 0.02 mm when using: a mixture of acetylene with zioü air. At: a mixture of 35 or 3o0`o acetylene with 65 or

o0o Oxygen, which is used in the official tests prior to approval the water reservoirs or dry locks come to the bottom are still a long way off smaller stomata are required, the exact size of which has not yet been determined.

If: it is therefore not accessible to direct such bodies Prevention of flashbacks in practice. to apply, they are suitable after the corresponding redesign to create larger gas passages as a flame retardant, namely bodies made of sand, clay, fireclay, glass wool, etc., as well as bodies made of metal chips and solid metal inserts.

As an example, a dry lock is shown in the figure, which: an annular insert body, es.sen sleeve z tightly on the body of the Fuse is pulled up, and openings 2 and 3 to the rooms. under and over the M: etallm: embran shows. In the annular space of the sleeve are thin, annular Plates .l pressed together which are smooth on one side and on the other Side have fine straight or curved gas channels. On the outside and on the inside The plate bundle has recesses 5 and 6 at the edge Gas coming from the supply line through channels 2 and 5, the fine channels in the Plates .l and through the channels 6 and 3 for discharge. The insert body will Easily arranged to be interchangeable so that it can be easily replaced if the ducts are blocked can be. The gas channels in the plates .l are vorzttgs -, @ - cisc after the etching process made to gc: iau dike-like depth of the canals; to secure. Legs degradation Flatnniengesclit @indigkeit can also be brought about by segregation of the gas mixture will. The burning goes on all the more vividly, the more complete it is Molecules are jumbled up. If it succeeds, the oxygen = f from the operating gas to separate, the propagation of a flame is impossible; succeed him partially separate, the flame advances more slowly. Recently are from C 1 u s i u s and D i c k e 1 in the journal for physical chemistry Dept. B, year 1929, issue 5/6 experiments published, according to which by means of an oblique When the separating pipe is placed, the effect of thermal diffusion results in complete separation of gas mixtures and even a decomposition of elements into its isotopes succeeded is. A practical use for building fuses for this purpose According to the results obtained so far, this is not yet possible because the segregation too slow.

Another means of reducing the flame speed is in the cooling of the gas. This can be done by arranging a jacket 7, which encloses part of the gas space of the fuse. Through one of the openings 8 or 9, one: cold liquid flows in, through the other opening.

The described invention of the IIeralisetzun.g the flame speed is not limited to the area of dry securing, but also applies to water reservoirs working according to the delay principle, e.g. B. the: so-called spiral, vasservorlagcn. as well as for fuses of all kinds where the consumption pipeline is used as a delay line is trained.

Claims (1)

Claim: protection against flashback and oxygen withdrawal with flame delay diversion according to claim 2 of patent 717847, characterized in that in the diversion devices for reducing the speed of the same passing flame, z. B. Insert body with fine gas passages and the like. Are used.