SU1423120A1 - Fire-explosion protection system for installation for unpacking paper bags with pulverulent fire-hazardous material - Google Patents

Abstract

The invention can be used to clarify liquids with carbon powder sorbents. The aim of the invention is to increase the efficiency of fire extinguishers. The dryness of the invention is that the installation comprises an air insulating chamber for encapsulating the working components of the installation. An aperture section is formed in the chamber with explosives spaced apart from one another and searched for entrance and exit gateways. On them razmesh.eny ogneizolyuyushuyu, and dampers. There is also a fire-protected collection of material in the chamber, an explosion-proof gas recycle air manifold for the material in an inert gas environment, a fire sensor and a fire extinguishing means. New in the installation is the fact that it is additionally equipped with fire protection, a collection of trash bags. This collection is equipped with a press plate to compress the combustible mass of the bags before they acquire the flame-resistant state. An inert gas ejector is installed in the area of the main chamber with the material to create an explosion-proof medium in the recirculation pneumatic line. 2 Il. (L

Description

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The invention relates to the prevention of explosions and fires, as well as the limitation of possible fires, especially during a fire or explosion. and, in particular, to the means of explosion protection of the installation for unpacking bags with powder, flammable and explosive coal.

The purpose of the invention --- improving the efficiency of fire protection.

FIG. 1 shows the structural scheme of the proposed fire protection system; in fig. 2 is a schematic depiction of a rasterising installation, side view in vertical 1M section.

The system comprises an air insulating chamber 1 for encapsulating the working units of the plant. In the chamber 1, a passage section is formed with input 2 and output 3 spaced apart for paper trays 4. The entrance 2 and exit 6 flaps are located at the entrance 2 and exit-) 1st 3 gateways.

The system is also equipped with a fireproof collector 7 for taking out the fractions from the bags I from the chamber I.

The output of collector 7 is brought to the averaging body of the hopper 8, after which the mixer 9 is installed to add water to the material and storage tank 10 for storage of the slurry prepared from the material.

The system is also equipped with an explosion-proof pneumotransport line 11 to remove the sprayed fractions from the chamber. On this line and 1, gate valve 12, dust collector 13 with exhaust fan 14 and collector 15 for collecting sprayed fractions are installed. The output of collector 15 is connected to the averaging bin 8 for combining the poured and sprayed fractions of the material. Filter 15 is installed on collector 15 to prevent the outgoing material with the pneumatic agent during the start-up period of the installation.

A similar filter 17 with a gate valve is installed on the averaging bin 9. At the entrance 2 and exit 3 gateways of the air-insulating chamber 1, the flaps 18 and 19 are also installed, which, alternately with the entrance 5 and exit 6, run as lock gates, prep penetration of ambient air into the air insulating chamber 1.

The system is also equipped with active fire extinguishing means 20 connected via control unit 21 with sensor 22. In addition, the system is equipped with a collection of 23 trash bags remaining in front of the exit locker 3, which are then discarded when the damper 19 is opened to the transport cart 24 for removal them from the installation. Above compilation 23

A press plate 25 is placed to crimp flammable residues of paper bags into a fire-resistant briquette-like state.

The press plate 25 is placed at the level of a dumper 26 of paper bag residues with puncture pins 27 mounted on a tilting rasternar platform 28, above which is placed a movable block of slotting cutters 29 for opening bags 4. This unit is mounted on contact skis 30 for passing onto the platform 28 bags. At the level of the platform 28 is installed the pusher 31 of the bags 4 supplied by the hoist 32 with the grip 32.

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An ejector 33 is installed in the discharge zone in the pneumotransport il for the dilution of the pneumotransport agent from the. Highway or ramp with cylinders 33 with an inert gas.

The ejector 33 is connected to a control valve 34, connected via a gas analyzer 35 to a sensor 36. The containers 7 and 15 are equipped with sensors 37 37 monitoring the level of a layer of material providing locking in the pneumatic system pneumoagent as well as 38 38f slide valves overlapping the output from the containers of the material. A membrane 39 is mounted on the air-insulating chamber 1, which breaks in the event of an explosion and discharges explosive gases to a safe place.

The system works as follows.

The gate valves 16, 17 are opened and the gate valves 38, 38 are closed. After this, the fan 14 is turned on, allowing air to circulate in the pneumatic system 11, then an inert gas, such as nitrogen, is added from the main line or ramp with cylinders 33 to create an explosive safe concentration. Air saturation with nitrogen is monitored by a gas analyzer 35. In this case, excess air is vented through filters 6 and 17 into the atmosphere. After reaching the explosion-proof concentration in the pneumatic agent, the gate valves 16f 17 are closed and the gate 18 is opened with the entrance gate 5 closed. With the help of the telpher trolley 32 with the catch 32, a paper bag 4 with material is fed into the entrance gateway 2, then the gate 18 is closed and the gate 5 is opened. The pusher 31 guides the bag 4 to the raster of the first platform 28. In this case, the pusher 31 punctures the bag 4 onto the pins 27 fixed to the platform 28.

On contact skis 30, a floating block of miter cutters 29 is fed, which cut the bag (in the longitudinal and 5 transverse) directions. At the same time, the fractions that fall are dropped into the fire-protected collection 7, and the sprayed fractions are entrained by the pneumatic agent through the pneumatic conveying system.

The main line 11 to the dust collector 13 accumulates in the collector 15. The skis 30 retracts the floating block of the slot-milling cutters and the load-receiving platform 28 turns over. The dumper 26 removes the bag remains and presses them on the press plate 25, after which, during the return stroke, the compressed paper waste accumulates in the collector 23. Then when the flap 19 is opened, they fall into the cart. With the accumulation of residues in the closed damper 19, the damper of the exit chamber b is opened and the waste trolley is taken out.

The process is repeated until a layer of material preventing accumulation of the pneumatic agent from the air insulating chamber is accumulated in collections 7 and 15.

The thickness of the guaranteed layer depends on the material and is chosen experimentally, for example, for coal dust with a fineness of 90 microns is 0.6 m. After that, the shutters 38, 38 are opened, the material is fed to the averaging collection 8, then to the mixer 9, where it is mixed with water and the slurry is sent to drive 10 and further to production. As work proceeds, a part of the pneumatic agent is carried out along with the material, therefore, according to the signal of the gas analyzer 35, inert gas is fed. In the event of an explosion in the air-insulating chamber -1, the gases rupture the membrane 39 and the safety space E is removed, and in case of fire, the sensor 22 through the control unit 21 closes the gate valve 12 preventing the transfer of fire along the pneumatic transport line 11 and activates the fire-fighting device 20.

The main technical advantage of the system in comparison with the prototype is the widening of the area of its use, extended to its use to protect installations for the screening of powdered sulfur and other fire and explosion hazardous materials, as well as unloading powdered materials, which by their chemical properties should not have contact with air.

Claims (2)

1. Fire Extinguishing System 1, and installations for unloading paper bags with dust-proof fire-hazardous material, containing an air-insulating chamber for encapsulating the working units of the installation, formed in the chamber through-pass section with fire-resistant entrance and exit gaps separated from one another, with open fire gates separated from one another by fire-resistant entrance and outlet gates, and there is a body of fire masses separated from one another. a fireproof flap, a fire-protected collection of material fractions, a pneumatic transport line installed in the lower part of the chamber, one end of which is connected to the upper part of amers, and 0 another - with a dust collector connected to an exhaust fan and a collection of sprayed fractions mounted above the chamber, an averaging bunker connected by pipelines to a collection 5 fractions of the material and a collection of sprayed fractions, the output of the averaging bunker is connected through a mixer with a cumulative capacity, characterized in that, in order to increase the efficiency of fire and explosion protection by eliminating the possibility 0 fire residues paper bags, it is installed at the exit of the entrance section fire-protected collection of residues of paper bag, above which is located a press plt to compress the residues. five., 2. The system according to claim 1, wherein that it has a means of supplying an inert gas to the discharge zone in the pneumatic transport line, made in the form of an ejector installed at the collection of fractions 0 of material associated with the source of inert gas. five/ Just about - Cff fff 2b (para.2 Editor N. Kishtulints Order 4460/6 Compiled by N. Mazaev Tehred I. VeresKorrektor L. Pilipenko Circulation 420 Subscription VNIIPI USSR State Committee for Inventions and Discoveries 113035, Moscow, Zh-35, Raushsk nab. 4/5 Production and printing company, Uzhgorod, ul. Project, 4