RU53923U1 - DEVICE FOR FIRE EXTINGUISHING FLAMMABLE LIQUID IN THE RESERVOIR - Google Patents

Abstract

The invention relates to stationary equipment for extinguishing fires, in particular, to devices used in automatic foam fire extinguishing systems for oil and oil products in vertical steel tanks with a pontoon, with or without a floating roof, and also in reinforced concrete tanks and can be used in the oil industry . A device for extinguishing a combustible liquid in a tank contains a low-level foam generator and a foam container. The low-foam generator includes a housing with holes in the form of nozzles for supplying a foaming agent solution to the housing and with an opening for supplying gas, a mixing chamber installed in the housing with an inlet opposite the nozzles, and an outlet connected to the foam container. The number of nozzles is six or nine, and the output diameters of these nozzles are 9.5 mm or 7.8 mm, respectively. The device also contains two multidirectional slit-like openings for the exit of the foam from the foam container and a bursting membrane sealed across the foam container. The technical result consists in increasing the productivity of the device to 15 l / s or 20 l / s without reducing the multiplicity of the foam and without significantly increasing its main dimensions in relation to similar devices providing a productivity of 5 l / s or 10 l / s, respectively.

Description

The invention relates to stationary equipment for extinguishing fires, in particular, to devices used in automatic foam fire extinguishing systems for oil and oil products in vertical steel tanks with a pontoon, with or without a floating roof, and also in reinforced concrete tanks and can be used in the oil industry .

A device for extinguishing a combustible liquid in a tank is described in the description of the patent of the Russian Federation No. 2232041 for the invention published on 04/10/2004, class. MKI A 62 S 35/02, 31/12, 03/06, 05/02. The device comprises a low-foam generator and a foam container.

The low-foam generator includes a housing with holes in the form of nozzles for supplying a foaming agent solution to the housing and with an opening for supplying gas, a mixing chamber installed in the housing with an inlet opposite the nozzles, and an outlet connected to the foam container. The foam container has an exit for foam from the foam container to the tank, made in the form of two differently directed slit-like openings.

The device also contains a sealing wall in the foam container between the foam outlet from the foam container into the reservoir and the mixing chamber, made in the form of a membrane, bursting under the action of foam pressure.

This device is the closest analogue to the claimed device.

A disadvantage of the known device is its inefficiency when extinguishing highly viscous oil or petroleum products. Fire extinguishing highly viscous oil does not allow the use of a sublayer

fire extinguishing system when extinguishing foam is fed into the tank under a layer of oil or oil products. Then the extinguishing foam rises to the surface of the oil or oil products in the tank and separates the oxidizing agent (oxygen) from the combustible liquid. Under conditions of high viscosity oil or oil products, the movement of extinguishing fluid through a layer of oil or oil products in the tank is difficult. And the main role in extinguishing in this case belongs to devices for extinguishing combustible liquids installed in the upper part of the tank and supplying foam to the surface of oil and oil products.

However, the known device according to the patent of the Russian Federation No. 2232041 does not allow guaranteed to provide increased productivity (15 l / s or 20 l / s instead of the usually provided productivity of 5 l / s or 10 l / s), which would compensate for the absence of a sublayer fire extinguishing system, without reducing the required fire safety standards of foam multiplicity (not less than 8 at a working pressure of a foaming agent solution of 0.9 ± 0.1 MPa) and without a significant increase in the main dimensions of the device. A significant increase in the main dimensions of the device does not allow the use of existing elements of connection and installation of the device on the tank, requires reconfiguration of equipment for its production.

The objective of the invention is to increase the efficiency of the device for extinguishing a combustible liquid in a tank.

The technical result consists in increasing the productivity of the device to 15 l / s or 20 l / s without reducing the multiplicity of the foam and without significantly increasing its main dimensions in relation to similar devices providing a productivity of 5 l / s or 10 l / s, respectively.

Like the closest analogue, the low-foam generator of the claimed device for extinguishing a combustible liquid in

the reservoir contains a low-foam generator including a housing with nozzle openings for supplying a foaming agent solution to the housing and a gas supply opening, a mixing chamber installed in the housing with an inlet opposite the nozzles and an outlet connected to a foam container having two differently directed slit openings to exit the foam from the foam container. The device also contains a bursting disc sealed across the foam container.

Unlike the closest analogue, the low-foam generator of the device contains six or nine holes in the form of nozzles with output diameters of 9.5 mm or 7.8 mm, respectively.

The device is shown in the figure with the following notation: 1 - a tank with oil or oil products, 2 - a low-foam generator, 3 - a generator housing, 4 - nozzles for supplying a foaming agent, 5 - holes for supplying gas, 6 - a mixing chamber, 7 - foam tank , 8 - slit-like holes, 9 - bursting disc.

A device for extinguishing a combustible liquid in a tank 1 comprises a low-level foam generator 2. The low-level foam generator 2 includes a housing 3 with holes in the form of nozzles 4 for supplying a foaming solution to the housing 3. The housing 3 also has an opening 5 for supplying gas. In addition, the generator 2 includes a mixing chamber 6, installed in the housing 3 by an inlet opposite the nozzles 4. The outlet of the mixing chamber 6 is connected to the foam container 7. The foam container 7 has two differently directed slit-like openings 8 for the foam to exit the foam container 7. The device contains a discontinuous a membrane 9 sealed across the foam container 7.

The number of nozzles 4 is six or nine pieces with output diameters of 9.5 mm or 7.8 mm, respectively.

The device operates as follows. In the event of a fire and the automatic fire extinguishing system is triggered, the foaming solution is fed into the low-foam generator 2, that is, into the housing 3 of the generator 2 through nozzles 4. Nozzles 4 form jets of the foaming agent. Behind the nozzles 4, these jets enter the mixing zone with gas, for example, air entering through the opening 5 into the housing 3. After mixing with the gas, the foaming agent takes the form of a semi-submerged, semi-free jet with a distinct core and diverging part. The jet enters the mixing chamber 6, where it is generated in the foam.

From the low-foam foam generator 2, the foam enters the foam container 7 and fills it up to a bursting membrane 9 sealed across the foam container 7. When there is no ignition of oil or oil products, the bursting membrane 9 prevents explosive and flammable vapors of oil and oil products from entering tank 1 into generator of low-level foam 2 and a pipeline (not shown in the figure) for supplying a foaming agent solution to generator 2. During ignition, when the foam pressure in the foam container 7 reaches a predetermined value ( for example, 0.01-0.1 MPa), the membrane 9 ruptures and the foam enters the slit-like openings 8. The openings 8 are directed so that the foam enters from them in the form of a flat fan stream into the region near the wall of the tank 1 and onto the wall of the tank 1. As a result of the supply of foam to the surface of the burning oil or oil products in the tank 1, the fire is extinguished.

When executing a device with six nozzles 4, the output diameters of which are 9.5 mm, its productivity rises to 15 l / s compared to the productivity of 5 l / s of the device, which is a specific embodiment of the closest analogue. At the same time, the multiplicity of the foam is not guaranteed to decrease and reaches the required standards

fire safety values of at least 8 at a working pressure of a foaming agent solution of 0.9 ± 0.1 MPa.

When performing a device with nine nozzles 4, the output diameters of which are equal to 7.8 mm, the productivity rises to 20 l / s compared with the productivity of 10 l / s of the device, which is a specific embodiment of the closest analogue. At the same time, the multiplicity of the foam is not guaranteed to decrease and reaches the required fire safety standards of at least 8 at a working pressure of the foaming agent solution of 0.9 ± 0.1 MPa.

The main dimensions of the claimed device increase slightly, which allows the use of existing elements of connecting and installing the device on the tank and the same equipment settings for the production of the claimed device, as for the device, which is a specific implementation of the closest analogue. So, the width of the claimed device has not increased compared to the specific implementation of the closest analogue. And the length increased slightly: by 24.5%. For example, in a specific embodiment of the claimed device, the length of the claimed device increased compared to the specific embodiment of the closest analogue by 25 cm for six nozzles 4 with an output diameter of 9.5 mm, and for nine nozzles 4 with an output diameter of 7.8 mm. The width of the slit-like openings 8 in a specific embodiment of the claimed device has increased compared to a specific embodiment of the closest analogue by 0.5 mm: from 1 mm in the closest analogue to 1.5 mm in the claimed device.

Thus, the efficiency of the device for extinguishing a combustible liquid in a tank is increased, which is due to an increase in the productivity of the device to 15 l / s or 20 l / s without

reducing the multiplicity of the foam and a significant increase in its basic dimensions in relation to similar devices providing a productivity of 5 l / s or 10 l / s, respectively.

Claims (1)

A device for extinguishing a combustible liquid in a tank, comprising a low-foam generator, including a housing with holes in the form of nozzles for supplying a foaming agent solution to the housing and with an opening for supplying gas, a mixing chamber installed in the housing with an inlet opposite the nozzles and an outlet connected to the foam capacity, two multidirectional slit-like openings for the exit of the foam from the foam container, a bursting membrane sealed across the foam container, characterized in that the generator is low multiple foam includes six or nine holes in a nozzle with outlet diameters of 9.5 or 7.8 mm, respectively.