RU1790950C - Method of fire-fighting with gaseous agents - Google Patents

Abstract

Usage: in fire extinguishing, in particular in a method for extinguishing fires with gas fire extinguishing compositions in unpressurized rooms. SUMMARY OF THE INVENTION: all openings in the room are closed with shutters, the last one farthest from the OTV supply source, the opening closed with a time delay relative to closing the remaining openings, and simultaneously with the closing of the last opening, the OTV supply is turned off, and the intensity of the OTV supply is chosen such so that all the required supply of OTV is supplied to the protected room before closing the last opening. 1 ill.

Description

The invention relates to fire extinguishing, in particular to a method for extinguishing fires with gas fire extinguishing compositions in unpressurized rooms.

A method of gas fire extinguishing is known, which consists in closing openings when a fire is detected and supplying a gaseous extinguishing agent (OTB) to the protected volume.

In this case, when the OTV is supplied, all air remains in the protected room. Therefore, the amount of OTA needed to create a fire extinguishing concentration must be calculated taking into account the total volume of air in the room, which leads to an additional consumption of extinguishing agent. In this case, as a result of the supply of the extinguishing agent, excessive pressure is created in the protected room, which can lead to the opening or destruction of closed openings (doors, windows, hatches, walls, etc.).

The purpose of the invention is to increase the efficiency of extinguishing leaking rooms.

This goal is achieved by the fact that in the fire extinguishing method, which consists in closing the openings when a fire is detected and supplying the extinguishing agent to the protected volume, the opening farthest from the OTV supply source is closed with a time delay relative to the closing time of the other openings, determined by the time the gaseous OTV approaches the to this aperture, and at the same time, with the closing of the last aperture, the supply of extinguishing agent is turned off, while the intensity of the supply of OTV is selected from the ratio:

esva

Xj

y o y o o

where 1p y the intensity of the supply of HFA to create a fire extinguishing concentration in the entire volume of the protected room (+ V2), kg

Vi is the volume of the room to the front edge of the last opening along the front of the OTV movement, m3;

V2 is the volume of the room after closing the last opening in front of the front of the OTV movement, m.

The implementation of the proposed extinguishing method is explained using the installation, a diagram of which is shown in the drawing.

After a fire is detected in room 1, the signal from the sensor 2 is fed to the control unit 3. In this unit, a signal is generated that is sent to the closed-device. tm 5 apertures 6, located at all open apertures, except the one farthest from the supply system A OTV. The actuation of the devices for closing the openings leads to the overlapping of the indicated receptions with the use of dampers 7. of this, the control unit forms the signal for supplying the OTV, which from the cylinder 9 through the shut-off device 8 and the supply system 4 enters the protected room, When the FRT reaches the OTV the front edge 11 of the last, farthest from the OTV aperture feed system, a sensor 10 is triggered that sends signals to the aperture closing device and to the control unit to turn off the OTV supply.

Thus, the use of the proposed method allows to increase the extinguishing efficiency due to the following conditions:

1. The displacement of part of the air due to the supplied OTV reduces the total content

oxygen in the protected room, which reduces the amount of OTV needed to create a fire extinguishing concentration. 2. The intensity of the supply of OTV, calculated according to the proposed dependence, provides for the time before the closing of the last opening to create a fire extinguishing concentration in the protected room. Forms of the invention

The method of gas fire extinguishing, which consists in closing openings when a fire is detected and supplying a gas extinguishing substance to the protected volume, with the exception of the fact that, in order to

to increase the efficiency of extinguishing fireproof rooms, the opening farthest from the extinguishing agent supply source is closed with a time delay relative to the closing time

other openings, determined by the time the gaseous extinguishing agent approaches this opening, and simultaneously with the closing of the last opening, the extinguishing agent is turned off,

the intensity of the extinguishing agent is determined from the ratio

 - (1 + V2 / V1),

where 10 is the rate of supply of the extinguishing agent to create an extinguishing concentration throughout the volume of the space to be protected;

Vi is the volume of the room to the front edge of the last opening along the front of the fire extinguisher, m;

V2 is the volume of the room remaining after closing the last opening in front of the front of the fire extinguishing agent, m3.

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