RU2155268C1 - Device for prevention of explosion of gas accumulations - Google Patents

Abstract

FIELD: automatic means providing for safety in performance of operations under conditions of atmosphere with high control of gas explosion hazardous concentrations. SUBSTANCE: device may be used for prevention of explosions in performance of mining operations in mines, wells, at gas transportation objects, in cases of their leakage in city gas supply systems. Gas-air mixture is passed through explosion-proof device where it is artificially ignited and when concentration is capable of burning, it burns to produce inert combustion products reducing explosion-hazardous gas concentrations. Device consists of flow-through chamber with fire-retarding members, supplying and discharging channels, power supply source, electric pulse generator, spark discharger, temperature-sensitive element and alarm. Flow-through chamber is explosion-proof and serves as a combustion chamber of gas mixture and has lower and upper fire-retarding members of screen type. Chamber accommodates spark discharger connected with electric pulse generator. Located on upper discharge channel is temperature-sensitive element connected with alarm. Supply channel has holes for intake of gas mixture. EFFECT: prevented explosion of gas accumulation in places of gas accumulation by its burning. 1 dwg

Description

 The invention relates to automatic means of safety of work associated with a high content of explosive gas concentrations, and can be used to prevent explosions during mining operations in mines, wells, at gas transportation facilities, in the event of leaks from the latter, in the gas industry of cities, etc. .

 A known methane control sensor [1], which has an explosion-proof housing made in the form of a cylindrical nozzle, closed above and below by fire arresters, providing explosion-proof design, free access of atmospheric air into the housing and removal of combustion products due to heat flow; a gas burner introduced into the housing through the side wall, negative and positive electrodes connected to an ion flow amplifier, the negative electrode being a volume spiral shaped like an elongated ellipsoidal belt, inside of which there is a positive electrode in the form of a conductor section.

 This sensor only monitors the dangerous concentration of the supplied gas, but does not prevent the possibility of an air-gas mixture explosion.

 A device for fire and explosion protection in gas exhaust shafts [2], containing a fan and a pipe with a device for blocking the bore of the pipeline when exposed to a blast wave, while the pipeline is equipped with a bypass manifold with safety valves installed between the fan and the gas suction well, a flow chamber with fire arresters , a mechanism for automatically maintaining an explosive gas concentration in a flow chamber, consisting of a methane sensor communicated with pans, and selective membrane unit to the feed, outlet pipes and connection for communication with the atmosphere, and plamyaprovodnoy tube informing the cavity of the flow chamber with the outlet of the conduit. The device for shutting off the cross-section of the pipeline is made in the form of a rotary damper installed at the interface between the pipeline and the flow chamber and the bypass manifold from the side of the gas suction well. An explosive gas concentration is constantly maintained in the flow chamber. When an open flame or explosive combustion occurs in the internal volume of the chamber, an explosion occurs that is extinguished by fire arresters, and inert products of the explosion are sent to the collector.

 This device is bulky, has a complex structure, the explosion of the gas mixture is prevented only at the wellhead, and not in places of gas accumulation.

 The technical result achieved by the invention is the prevention of explosion of gas accumulation in the places of its accumulation due to burning of the latter.

 The technical task is achieved in that the device for preventing the explosion of gas accumulation, consisting of a flow chamber with flame arresters, underwater and outlet channels, according to the invention is additionally equipped with a spark gap, a power source, a temperature sensor and an alarm, while the flow chamber is a constant combustion chamber of the gas-air mixture and equipped with a lower and upper mesh type flame arrester, inside the chamber there is a spark arrester connected to a power source, on the upper m branch duct temperature sensor is connected to the signal transmitter and the underwater channel is formed with apertures for admission of the gas mixture.

 The invention consists in the following. In places of possible accumulation of gas, devices of the proposed design are installed, they are connected to a constant or autonomous power source. The gas-air mixture through the feed channel and the lower fire arrester enters the flow chamber, which is also a combustion chamber, where a constant pulsed sparking occurs. Provided that the gas-air mixture reaches an explosive concentration, it burns out, releasing inert combustion products, which, through the upper flame arrester and the exhaust channel, go into the environment. The combustion process takes place continuously until the concentration of the gas-air mixture becomes so small that its combustion becomes impossible. At the moment of passage of hot combustion products through the outlet chamber, a thermal sensor is activated, including a light or sound alarm.

 The drawing shows the design of the device and a block diagram of its electrical part.

 The device comprises a flow-through combustion chamber 1, a gas mixture supply channel 2, a combustion products removal channel 3, lower and upper fire arresters 4 and 5, located on the side of channels 2 and 3, respectively. The electrical unit contains a power source 6 connected to an electric pulse generator 7, a spark gap 8, a temperature sensor 9, and an alarm 10.

 The device operates as follows.

 It is installed in the places of the supposed accumulation of gas (mines, wells, cellars, low places along the gas pipeline, etc.). The pulse generator 7 is connected to a constant or autonomous power source 6, which supplies electrical pulses to the spark gap 8 with an adjustable frequency. The gas-air mixture through the gas supply channel 2 through the fender 4 enters the flowing combustion chamber 1. If the concentration of the gas-air mixture is explosive, it burns out due to the spark supplied by the spark. Due to the heat flux, inert gas combustion products escape through the flame arrester 5 through the exhaust channel 3 into the environment, thereby reducing the concentration of explosive gas-air mixture. When a combustion process occurs in the device, the temperature sensor 9 mounted on the outlet channel 3 is activated, and information on the combustion of the gas-air mixture is transmitted through the light or sound signaling device 10.

 The advantage of this technical solution is that it can be implemented in the form of a compact portable device installed in the place of a possible gas emission. The application of the invention will prevent the explosion of gas accumulations in mines, wells, apartments, in places of possible gas accumulations during gas transportation through gas pipelines, in the gas industry of cities, etc.

Sources of information taken into account
1. Auth. St. N 467192 "Methane control sensor", authors Gulyaev B.V., Kudryavtsev V.N., BI N 14 from 04/15/75

 2. Auto N 1696734 "Device for fire and explosion protection of mines", the authors G. G. Stekolshchikov and others, BI 45 from 07.12.91, the prototype.

 3. Auth. St. N 1500797 "Automatic methane control device for coal mines", authors M.D. Azbel et al., BI N 30 of 08/15/89.

 4. Auth. St. N 2086771 "Device for suppressing fires in mines and mines", authors Chuprikov A.E. and others, BI N 22 from 08/10/97

Claims (1)

 A device for preventing an explosion of gas accumulation, consisting of a flow chamber with flame arrester, underwater and outlet channels, characterized in that it is equipped with a spark gap, power supply, temperature sensor and signaling device, while the flow chamber is a constant combustion chamber of the gas-air mixture and is equipped with a lower and upper mesh flame arrester type, inside the chamber there is a spark gap connected to a power source, on the upper outlet channel there is a temperature sensor connected to a signaling device rum and underwater channel is formed with apertures for admission of the gas mixture.