Explosion protection system

Abstract

1. Technical effect Increasing the quick action, efficiency and reliability of currently available explosion protection systems. 2. Essence of application The proposed explosion protection system contains an explosion detector and a shock wave damping agent discharge device. The detector consists of overpressure and flame sensors, an identification module and an electromagnetic signal wireless transmitter. The discharge device contains a container filled with damping agent. 3. Field of use Protection of infrastructural and industrial facilities from non-authorized and, terrorist explosions; localization of methane explosion energy in coal mines.

Claims

1. An explosion protection system for protecting a structure having a floor, a wall, and a ceiling, the system comprising a detector fixed on the wall or the ceiling of the protected structure; and a discharge device for discharging a shock wave damping agent, in liquid or inert powder form, and located on the floor, or the wall, or the ceiling of the protected structure at a distance from the detector, wherein the detector contains over pressure and flame sensors, an identification module and a wireless electromagnetic signal transmitter, and wherein the discharge device has a container filled with the damping agent, a wireless electromagnetic signal receiver attached to the container, an electrical initiator and pyrotechnic chemicals located in a liquid or inert powder-proof jacket secured on an inner surface of a container lid, the wireless electromagnetic signal receiver being connected with the electric initiator and the pyrotechnic chemicals by a wire, and dispersing nozzles secured on a wall or a bottom of the container and having outer ends thereof blocked by removable plugs.

2. An explosion protection system according to claim 1, wherein the damping agent is the inert powder form, the jacket is elastic, and the bottom of the container is blocked by a fragile diaphragm.

3. An explosion protection system according to claim 1, wherein the discharge device comprises at least one further container having an electric initiator thereof connected with the wireless electromagnetic receiver, and wherein the container and the at least one further container both discharge jets in a same direction or in an opposite direction, or in a direction at an angle to the same and opposite direction.

Description

(1) The explosion protection system is presented in FIG. 1-6.

(2) FIG. 1 shows the layout plan of the protection system in the tunnel;

(3) FIG. 2electric circuit of system activation;

(4) FIG. 3principal scheme of liquid suppressing agent discharge device in which dispersing nozzles are installed on the container wall;

(5) FIG. 4principal scheme of liquid suppressing agent discharge device in which dispersing nozzles are installed on the container bottom;

(6) FIG. 5principal scheme of the inert powder discharge device;

(7) FIG. 6principal scheme of inert powder discharge device which contains two containers.

(8) The protection system contains detectors and suppressing agent discharge devices installed in the protection zone at certain distances (FIG. 1). The detector block (1) is fixed on the surface of the tunnel ceiling or the wall by means of a special fixator (2). The discharge device (4) is installed in a special niche in the tunnel wall or the ceiling by means of clamp (3) so as not to interfere with the normal operation of the tunnel.

(9) The system is activated by means of a wireless device (FIG. 2). The detector (1) contains overpressure (5) and flame (6) sensors, an emergency identification module (7) and an electronic signal transmitter (8). The detector ensures constant monitoring of overpressure and flame in the tunnel. The electronic scheme of the identification module (7) is selected so that an electric impulse generates when overpressure or flame reaches preliminarily determined limit parameters. The transmitter (8) generates an electromagnetic encoded signal of certain frequency in the tunnel immediately upon receiving the electric impulse. The encoded electromagnetic signal is received by the encoded electromagnetic signal receiver (9) installed in the body of the discharge device (4). The receiver immediately sends the electric impulse to the gas-generator's electric initiator (10), which ensures high pressure generation in the discharge device, the suppressing agent discharge in the tunnel and protection barrier formation.

(10) The principal scheme of the liquid suppressing agent discharge device is shown on FIG. 3 and FIG. 4.

(11) The liquid suppressing agent discharge device consists of a container (12) filled with, shock wave suppressing liquid agent (13). An electromagnetic signal wireless receiver (9) is fixed to the outer surface of the body of the container (12) and an elastic liquid-proof jacket (14) containing an electric initiator (10) and pyrotechnic gas-generating chemical substance (11) is fixed on the inner surface of the body. The electric initiator (10) is connected to the receiver (9) by electric conductors. Liquid dispersing nozzles (15) are installed on the container (12) walls (FIG. 3) or on its bottom (FIG. 4), the ends of which are blocked with easily discharged plugs (16). Dispersed water or a mixture of dispersed water and glycerin or the suspension of dispersed water and inert dust can be used as a liquid suppressing agent.

(12) The principal scheme of the inert powder discharge device is shown on FIG. 5. It contains a container (12) filled with shock wave suppressing powder (19). An electromagnetic signal wireless receiver (9) is installed on the container (12) lid's outer surface; a cone-shaped directional (20) and an elastic jacket (14) are attached to the inner surface. In the jacket are placed an electric initiator (10) and pyrotechnic gas-generating chemical substance (11).

(13) The electric initiator (10) is connected by electric conductors to the receiver (9). The end of the container (12) is blocked with an easily fragile diaphragm (21).

(14) FIG. 6 shows a principal scheme of inert powder discharge device which contains two containers. The containers (12) have an electromagnetic signal joint receiver (9), while other elements are analogous with the device shown on FIG. 5.

(15) The protection system operates in the following manner: the protection system installed in the protection zone works in the waiting mode, the duration of which is not limited. The discharge device activates only during explosion or during the combustion of methane-air mixture, as shown on the scheme presented in FIG. 2.

(16) The container (12) of liquid suppressing agent discharge devices (FIG. 3, FIG. 4) is in the initial condition with water or water and glycerin mixture, or water and inert powder suspension, or water and foam-generating reagent.

(17) With the explosion and the initiation of the jacket of the gas-generator (14), the elastic jacket is immediately inflated under the impact of the high-pressure has (17) generated inside. This generates high dynamic pressure in the liquid of the suppressing agent. Under the hydrodynamic pressure impact the outer end plugs (16) of the dispersing nozzles are discharged and the liquid agent jet is discharged from the holes of the discharger at high speed. Nozzles of special design (hole diameter is 1-2 mm and a jet reflecting rod-shaped element is fixed at its external end) are used for dispersing liquid agent. During discharge a mist-like atmosphere (18) is formed the liquid drop diameter in which is less than 1 mm (extinguishing barrier). As is well-known, experimental studies have shown that such atmosphere is characterized by a high capacity of energy suppression.

(18) Inert powder (19) discharges from the container (12) of the inert powder discharging device (FIG. 5) as follows: in the process of immediate inflation of the elastic jacket (14) a dynamic shrinking force is generated in the powder, the impact of which crashes the diaphragm (21), causes the powder mass move at high speed and become discharged in; the atmosphere forming a cloud of powder particles (18) in the protection zone, which creates shock wave extinguishing barrier. [1] EN 14591-2:2007 Explosion prevention and protection in underground minesProtective systemsPart 2: Passive water trough barriers. RU 2342535, E21F5/00 (2006 January). Means of localization of explosions of methane-air mix and (or) coal dust in underground developments and a device for the realization of the task