SU902765A1 - Device for localization of fire - Google Patents

Description

one

The invention relates to fire fighting equipment, in particular, to devices that limit the passage of a flame through gas mains, and can be used in chemical, petrochemical and other industries.

A device is known for localizing a flame, containing its vessel with a gas supply and a gas outlet, with its tubes, divided into chambers by partitions with openings located below the level of the liquid 1.

This device is unreliable in operation, because of the large resistance to gas flow in the space under each partition, gas cavities can form. As a result, when the detonation wave strikes backward, the flame can pass into the protected system. Due to the overlap of a significant part of the vessel cross section with transverse partitions, the device has a large hydraulic resistance.

The aim of the invention is to increase the efficiency and decrease the flow resistance of the device for localizing the flame.

To do this, in the proposed device, the partitions installed vertically divide the vessel into equal in volume

5 chambers and have additional openings located above the surface of the liquid, and the gas supplying tube is provided with outlets to each chamber, and their outlet openings are located on the same

0 level from the surface of the liquid.

FIG. 1 shows the proposed device; in fig. 2, 3 and 4 is a cross section of the device with various options for mixing, partition walls.

The device includes a vessel 1 filled with liquid, in which the partitions 2 are placed along the vertical axis, each of which has an opening 3 above the layer, a liquid and an opening 4 under the liquid layer. Gas supply w, and the pipe 5 before entering

20 into the vessel is branched into nozzles 6 for introducing gas, which are embedded in the lid of the vessel so that inside the vessel each nozzle is enclosed in one of the chambers formed by partitions, while the outlet openings of the nozzles are fixed at the same level from the surface of the liquid. The vessel has a vapor pipe 7.

The partitions divide the vessel into chambers of the same size and their number can be any, depending on the flow rate of the gas being transported.

The apertures 3 intended to discharge gas from the chambers into the exhaust pipe 7 are located at the same level as the opening of the pipe and are commensurate with it in size.

During operation, the gas passes through the gas supply pipe 5, then displaces the liquid from the pipes 6 and at the exit of each of them a gas bubble is formed, which at the time of exit from any one pipe (simultaneous separation of the bubbles from the sections of all pipes is almost impossible) displaces the corresponding volume of fluid in the chamber. At the same time, an increase in the height of the liquid layer leads to an increase in the hydraulic resistance for the next gas bubble to exit into the chamber. Therefore, meeting less hydraulic resistance, the gas passes through a layer of liquid in another chamber. Thus, gas, by alternately changing the hydraulic resistance in the chambers, bubbles into them after a certain time equal to or less than the period when the gas bubble passes through the liquid layer. Due to the openings 4 in the chambers, the same liquid level is maintained until the beginning of the gas barbortion, and during the passage, the process of leveling the liquid levels in the chambers is slowed down, as a result of which gas is alternately supplied to each chamber. The gas, having passed through the openings 3 and the exhaust pipe 7, is directed to the gas pipeline to the consumer. A detonation wave arising in the gas line enters through the gas exhaust pipe 7 and the orifices 3 into the gas space of the chambers and goes out when it comes into contact with the surface of a liquid that does not have gas jets or a continuous circuit of gas bubbles.

The device provides efficient crushing of the gas flow, while the gas volumes (bubbles) are separated from each other by a significant layer of liquid and with the possible ignition of a bubble near its

the surface (due to shock compression from the action of the detonation wave) prevents the ignition of the subsequent ones, i.e., the flame is reliably extinguished. This prevents emergencies associated with explosions and fires during

transportation and storage of flammable

gases.

With constant dimensions

The gas flow rate through the device can be increased by increasing the amount of space with pipes for gas inlet by installing the appropriate number of partitions in the vessel.

The device has a low hydraulic resistance, since it operates with an almost complete cross section that does not overlap with gratings, partitions and other elements.

Claims (1)

Invention Formula A device for localizing a flame, containing a vessel with gas supplying and gas exhausting pipes, divided into chambers by partitions with openings located below the liquid level, characterized in that, in order to increase the working efficiency and decrease the hydraulic resistance, the partitions installed vertically, the vessel is divided into chambers of the same volume and have additional openings located above the surface of the liquid, and the gas supply pipe is provided with outlets to each chamber, and their output Verstov arranged at the same level of the liquid surface.  Sources of information taken into account in the examination, 1. USSR author's certificate number 244936, cl. A 62 C 43/04, 1967.