DE2218578B2 - Method and device for preventing fires or explosions in gullies - Google Patents

Description

Sewer inlet to prevent fire. Explosions or similar reactions of oxygen with gases or gas mixtures, they are far too expensive and z \ i heavy. In addition, to fight the Eidbrand you need expensive fire extinguishing agents in the form of chemicals that contribute to environmental pollution. In one fire extinguishing device, water is only used as a propellant for the chemical fire extinguishing agent.

The invention is based on the object Method and a device for preventing fires, explosions or the like of those mentioned at the beginning Kind to train that while eliminating the disadvantages and deficiencies of the above State of the art Fires and explosions during welding and burning work in the vicinity from Gulh-s to be avoided with certainty and au-iterdcm the expensive spraying of the covers with the help of at least one worker avoided will.

This object is achieved according to the invention in that a water jet is provided with a twist is mixed with air and the water-air mixture around the gully to be secured to one self-contained wall is built.

The technical progress that can be achieved with the invention is based on the advantageous effect that the Wa'l built around the GuIh from a water-air mixture prevents explosive gases from escaping from the GuIh. It also becomes an effective Protection against fire and explosions achieved.

In the case of the device for carrying out the procedure according to the invention with a cover for the gully is the cover with a water connection, provided a swirl generator and a mixing device and arranged at a distance above the gully. This prevents sparks or glowing metal parts from penetrating the cover and causing a Trigger gully fire. The glowing metal parts slide off the hood and from there into the wall from a mixture of water and air, which immediately extinguishes or cools them down. The device is as well easy to set up and easy to use.

Further essential features of the invention are listed below: According to an essential A feature of particular importance is the hood as a funnel with a larger diameter End with at least three adjusting pieces and at one end with a smaller diameter with a connecting piece designed for the swirl generator and the mixing device. This results in an even leadership of the water-air mixture from the connection piece to the edge of the funnel is possible.

In order to give the incoming water sufficient swirl, the swirl generator consists of a truncated cone Stopper with. several at an angle to its longitudinal axis, along its entire length and in radial trains for the passage of the water. The trains are advantageous for the Passage of the water designed as open slots on the circumference of the plug. Furthermore, the kcgcl is frustum-shaped Plug inserted into a nozzle with a conical inner wall, which is replaceable Seals trains on the circumference of the stopper.

In a preferred embodiment of the invention, the outlet end of the nozzle is conically narrowed and arranged opposite the inlet opening of a Venturi nozzle, the outlet opening of which into the dun: hnw> the smaller end of the funnel opens.

The nozzle is surrounded by a slotted cage so that no foreign bodies are sucked in. To the easy replacement is the truncated cone

S Stopper at its larger end with a Pen that can be touched and, for reasons of air flow, on its smaller diameter Pointed end. The mounting pieces are used to adapt to the respective water pressure

* ° arranged adjustable on the funnel.

The invention is shown in the drawing using an exemplary embodiment illustrated. It shows

Fig.! the device in the middle longitudinal section, and

Fi a. 2 the twist boar in front view and on a larger scale.

At a low point of a surface 10 to be drained is located as the upper end of an inlet bowl 11 the sewer a gully 12. the means

ao a hood 13 in the form c '^ - js funnel 14. preferably made of sheet metal, is covered. At the lower, larger-diameter end 14ίί of the funnel 14, three mounting pieces 15 are adjustably attached. The erecting pieces 15 are simple sheet metal strips, the erecting end 15ti is slightly curved. At their other end ISb they have an elongated hole 15i through which a screw 16 with a nut 17 inserted through a hole 14 in the funnel 14 engages. The funnel 14 is held at a distance above the gully 12 by means of the erecting pieces 15.

At the smaller-diameter end 14r of the funnel 14, a flange 18 is attached, which with a flange

19 is screwed by means of screws not shown. The flange 19 is at the exit opening 20 /> a Venturi nozzle 20 attached, which with her Entrance opening 20 "in a testicle 21"; one with Slits 21ή provided cage 21 is screwed. A fastened to the Venturi nozzle 20 is used for tightening Key flange 22. The cage 21 has a cover 21c with several threaded holes 23 in the screws, not shown, are screwed in, which have a flange 24 with through holes 24 (j under the intermediate layer eim.r seal 25 on the Hold the cover 21c ". An elbow 26 is attached to the flange 24, into which a filter 27 is let is and to which the water connection, usually in the form of a Wasserschlauchcs 28, is releasably attached.

A nozzle 30 is located in the cover 21c of the cage 21 with a flange 30 ″, which has a cone conveying

migc inner wall 30 /) and its exitscndc 30c is conically narrowed. In the nozzle 30 is a swirl generator in the form of a stump-shaped plug 31, with several radial lines in the form of open on the circumference of the plug 31

Slots 32 is provided, the angle / u his Longitudinal axis, along its entire length and in a radial direction Run direction. The stopper 31 has a pin 33 for gripping when replacing and for fluid flow Establish a tip 34. The stop

Fen 31 lies tightly against the inner wall 3Gb of the nozzle 30, so that it closes its slots 32 tightly on the circumference. The water flowing through the water connection 24 to 28 at a pressure of about 5 atmospheres is therefore deflected in the circumferential direction when it flows through the swirl cover 30 to 34, and thus receives a swirl. With this twist, it emerges from the outlet tube 30r of the nozzle 30 and tears in the mixing device

20 to 22 using the known Venturi

The effect of the surrounding air and enters the Venturi nozzle 20, in which the water mixes with the sucked in air while maintaining its swirl. This Waser-air mixture exits from the Ventundüse 20 in the hopper 14 and flows as a result of the heat generated by the swirl centrifugal force on the inside of the funnel 14 along to durchmessergrößerem to the end 14a and from there between the hopper edge and surface 10 from the Funnel 14, where it builds up as a result of its high speed to form a wall 35, on the underside of which the water flows back into the gully after the air contained in it has largely escaped.

The three criteria for a work process are at of the invention:

1. The object that is acted on with the invention without it being the aim of the influence! to change this itself is the water:

2. the change-free effect on the object is that the water is given a twist and that it is mixed with air;

3. The aim of the work process is to build a wall from a water-air mixture that carries away the gases in the gully and seals the gully from fire and explosion.

The advantageous effects of the device for carrying out the method according to the invention result from the fact that when burning or welding work in the vicinity of gullies falling sparks ίο or glowing metal parts slide off the outside of the funnel 14 and in the wall 35 of a water-air mixture deleted or cooled down. This provides good protection against fire and explosion during flame and visual welding work on the premises of refineries or chemical plants. Furthermore, the device is easy to set up and easy to use because it has no moving parts. it is practically not subject to wear, so that it has a long service life.

With increasing gully size, the length of the Venturi nozzle is shortened.

Ml. l / H I Hl.IM A, J.IUIIW, I!

Claims (10)

Patent claims: 1. Procedure for preventing fires, explosions or the like reactions of oxygen with gases or gas mixtures in gullies and the adjoining inlet manhole of the sewer system, in which the gully is covered is characterized in that a water jet is provided with a swirl, mixed with air and the water-air mixture is built around the Guliy to be secured to form a self-contained wall. 2. Apparatus for performing the method according to claim 1 with a cover for the gully, characterized in that the cover (13) with a water connection (24 to 28), a swirl generator (30 to 34) and a mixing device (20 to 22) and in the Distance above the gully (12) is arranged. 3. Apparatus according to claim 2, characterized in that the hood (13) as a funnel (14) with at its larger-diameter end (14c) with at least three mounting pieces (15) and on its smaller-diameter end (14c) with a connecting piece (18, 19) for the swirl generator (30 to 34) and the mixing device (20 to 22) is formed. 4. Apparatus according to claim 2 or 3, characterized in that the swirl generator (30 to 34) from a frustoconical stopper (31) with several at an angle to its longitudinal axis, along its entire length and in the adial direction for the passage of the water consists. 5. Apparatus according to claim 4, characterized in that the trains for the passage of the Water as on the circumference of the plug (31) open slots (32) are formed. 6. Apparatus according to claim 4 or 5, characterized in that the frustoconical Plug (31) inserted into a nozzle (30) with a conical inner wall (306) so that it can be replaced which closes its trains on the circumference of the plug. 7. Apparatus according to claim 6, characterized in that the outlet end (30c) of the The nozzle (30) is conically narrowed and opposite the inlet opening (20a) of a Venturi nozzle (20) is arranged, the outlet opening (20b) in the smaller-diameter end (14c) of the funnel (14) opens. 8. Device according to claims 6 and 7, characterized in that the nozzle (30) of a slotted cage (21) is surrounded. 9. Device according to claims 4 to 6, characterized in that the frustoconical Plug (31) at its larger diameter end with a pin (33) and at his the smaller diameter end is provided with a tip (34). 10. The device according to claim 3, characterized in that the mounting pieces (15) on the Funnel (14) are arranged adjustable. The invention relates to a method and a device for preventing fires and explosions or the like reactions of oxygen with gases or gas mixtures in gullies and the water attached to them subsequent inlet shaft of the sewage system by covering the gully. The procedure and the Device is mainly required by refineries and chemical plants, but also by public ones Municipalities. ίο In the factory sewer system of refineries and chemical plants are formed from the various chemical waste materials that burn flammable gases partly rise up through the gullies and their inlets. In the sewers of public Municipalities form digester gases that are also flammable. Must be in a refinery or a chemical plant welding or burning work is carried out near gullies, so would Falling sparks or glowing parts ignite the flammable and sometimes highly explosive gases and cause a fire or explosion. Therefore, before the burning or welding work the gullies are covered with jute sacks on which sand is poured. In addition, before and during the Burning and welding work a worker constantly busy handling the sand and dit jute sacks Keeping water wet from a hose from the plant's own water supply network. That means one great effort in manpower. It can also happen that burned-off glowing metal parts Beat through or burn through sand and burlap sack. Then only a quick one will help Escape before at least the gullies blow up. There is a device for erasing from the Burning gases emerging from the ground known from a hood that can be placed on the ground exists, into which an extinguishing agent is introduced. The hood, which is open at the bottom, has a tall chimney and provided with long handles with which the hood was held over the burning earth will. After the hood placed on the scene of the fire as a result of the induced draft of its high chimney has sucked in part of the flames emerging in the vicinity of it, they are still outside the hood existing flames by means of a fire extinguishing agent, e.g. B. Carbon dioxide in gas ocier Snow shape, erased in the usual way. Then the fire extinguishing agent is fed through a pipe from above inserted through the chimney into the interior of the hood, where it suffocates the flame. To extinguish burning oil wells, it is known to put a hood on the burning well, into the fire extinguishing agent through the lower edge and about halfway up the hood all around distributed openings under pressure, e.g. B. is introduced by means of a steam stream. After putting on the hood on the earth fire tends to suffocate the flames. By introducing Steam, air or water under pressure as a propellant in the hood will extinguish the flames driven and the flames are extinguished. The mixture of smoke gases and fire extinguishing agents will discharged through pipes attached to the top of the hood. Both known devices are used to fight earth fires that have already broken out and should be deleted again. Ais covering of gullies and dsm adjoining them