SU1553146A1 - Method of fire-extinguishing - Google Patents

Abstract

The invention relates to fire extinguishing and can be used to extinguish fires in industrial buildings equipped with fixed fire extinguishing systems. The aim of the invention is to increase the efficiency of extinguishing fires. The essence of the technical solution is that the impulses of the fire extinguishing composition emanating from the nozzles-sprayers have a different frequency, which will allow you to extinguish the fire sources in any place of the controlled territory. 2 Il.

Description

The invention relates to fire extinguishing and can be used to extinguish fires in industrial buildings equipped with stationary fire extinguishing systems.

The purpose of the invention is to increase the efficiency of extinguishing fires.

FIG. Figure 1 shows the arrangement of spray nozzles for extinguishing a Class B fire; Fig 2 - the same, top view.

The essence of the invention is that the pulses of the extinguishing agent emanating from the spray nozzles have a different frequency. Denote these frequencies f | and f2 respectively. Suppose that, and that the rate of outflow of the jets from the nozzles-sprayers is the same and known, the initial impulses of the fire extinguishing composition expire from both nozzles-sprayers at the same time. Obviously, they meet at an equal distance between the nozzles-sprayers. We denote the time of their collision

It is also obvious that pulses with a higher frequency b will be constantly ahead of pulses of the same name with a frequency for a time equal to

A, 7-2-r, f - /, (1)

h n

where T1 and Go are the periods of frequency pulses f

and / 2 respectively

Consequently, each subsequent pair of pulses will collide at a time A / later than the previous one, i.e. the second pair - through time

(2)

next time

/ 2/1 + D / 2D /. (3)

and so on

(four)

Know the speed of the expiration of the pulses of the fire extinguishing composition of the nozzles-sprayers

W - -

 five)

where t is the second consumption of fire extinguishing composition;

S is the density of the extinguishing agent;

F is the hole area of the spray nozzles,

it is possible to determine at what distance 1g the front of maximum intensity will move through / g of pulses of a higher frequency fj from the point of impact of the first pulses

S

(L

SP

ate

with

-and

O5

M ,. Wn-tn Wn-n l Wn

tt g

(6)

The number of pulses per time / „can be determined from the ratio

(7)

Substituting (7) into (6), we obtain ln Wa-fi-tn. (8)

A /, 1,

From the formula (&) it can be seen that when the speed of movement of the maximum intensity front has a positive solution, the direction of movement of the maximum intensity front is from the spray nozzle 5 to the spray nozzle b

If, however, to change the sign of L, me to do, then the direction of movement of the front will change to the opposite

And} change the frequency difference L / you can adjust the speed of the front of maximum intensity

Changing the time ("after which the direction of the front of the maximum intensity changes to the opposite, the magnitude and position of the fire extinguishing zone can be adjusted

The fire extinguishing composition in the fire extinguishing apparatus 1 of the shade, on which distribution valves 2 are installed, connected via pipelines 3 and 4 to stationary, counter-directed nozzles-sprayers 5 and 6, which are placed on racks 7 and 8 near the fire source 9 Nozzles-nozzles are oriented so that the counter-jet fire extinguishing composition 10 and 11 were hit over the fire site 9 with the formation of a front of maximum intensity 12 and dead zones 13 and 14

When striking jets 10 and 11 are supplied to the fire site 9 by periodic continuous pulses of differing frequency from the apparatus 1 using cranes 2, the front of maximum intensity 12 continuously moves over the entire surface of the fire source 9 in reverse mode and covers the dead zones 13 and 14

The use of this method will allow you to extinguish fires in any place of the controlled territory. In addition, it will reduce the total performance of the supply of fire extinguishing composition at the same time of fire extinguishing and the time of extinguishing at the same performance

Claims (1)

Invention Formula The method of extinguishing fires by filing 5 per hotbed of at least two fire extinguishing jets with periodic continuous pulses from different sides before hitting them over the fire, characterized in that, in order to increase the effectiveness of the quenching, the delivery of striking jets is produced with different frequency of impulses 0 Fig 1