SU883404A2 - Device for flame-jet working of mineral media - Google Patents

Description

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The invention relates to the mining industry and can be used for fire-treatment of mineral media, the destruction of rocks and the surface treatment of stone blocks.

In the main-avt.sv. No. 734408 a device for fire-blasting treatment of mineral media is known, it contains a combustion chamber with a nozzle opening and a fogkammer connected to the oxidant supply channel, in the lid of which a fuel supply channel is made; a cone-shaped conical is fixed: through the pre-chamber and forming with its machines an annular gap connecting the two chambers to each other. At the same time, in order to increase the intensity and combustion and simplify the design of the device, the cone-shaped hollow element is connected to the feed channel-combustible and has in its strips

Near the apex there are tangential openings for its exit, oriented towards the direction of movement of the oxidant entering the prechamber.

The life of the cone-shaped hollow element — in this device — is 75,100 hours. The bottom burns out most quickly in it, since it is located in a zone of high temperatures. Besides,

10 in a cone-shaped element, the fuel is not heated to a gaseous state, and the quality of the preparation of the fuel mixture is not always satisfactory for intensive

15 of the combustion process, thereby increasing fuel consumption.

The purpose of the invention is to reduce fuel consumption and increase the service life of the device.

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Claims (1)

The goal is achieved by the fact that, in the device, a cone-shaped hollow element is provided with a branch pipe placed inside it, connected one end to a fuel supply channel and located at the other, open end, near the bottom of the cone-shaped element. Due to such an implementation of the device, it becomes possible to improve the cooling of the bottom of the cone-shaped element by omitting it with a jet of fuel, increasing the efficiency of fuel preparation and reducing its consumption. The drawing shows a device for fire-treatment of mineral media. The device for fire-treatment of mineral media contains a combustion chamber 1 placed in a housing, limited by a nozzle cover 3 with an opening 4 and a cover 5 ,. fixed in the housing 1. In the lid 5, a fuel supply channel 6 is provided, which communicates with the cavity 7 of a closed cone-shaped hollow element 8 mounted coaxially to the combustion chamber 2 and forming a prechamber 9 and an annular gap 10 connecting it 2 both 9 and 9. Near the apex, the cone-shaped element 8 in its walls has tangentially located openings 11 for the exit of fuel, oriented towards the direction of movement of the oxidant entering the pre-chamber 9 via Pipeline 12, the annular channel 13, and a window 14. For passage And the oxidizer into the combustion chamber 2 in it is filled with holes 15 located closer to the canopy cover 3. In the cavity 7 of the conical hollow element 8 there is an outlet 1 which is at one end tightly connected to the channel 6, and the other end of the open end ends near the bottom 17 of the cone-shaped element 8 The device works as follows. From channel 6, the fuel enters pipe 16, from which it is ejected to the central part of the bottom 17 of the cone-shaped hollow element 8. The path of movement of the fuel is shown in the drawing by arrows. The fuel cools the central part of the bottom 17 of the cone-shaped hollow element 8 and is heated to a gaseous state. The peripheral part of the cone-shaped element 8 is cooled by an external flow of the fuel mixture, which passes through the annular gap 10 from the prechamber 9 to the combustion chamber 2. Behind the bottom I 17 of the element 8 in the combustion chamber 2, a zone of reduced pressure occurs, in which the fuel mixture moves at low speed. As a result, the ignition of the fuel in the combustion chamber 2 is facilitated and stable combustion is achieved (without flame). The fuel mixture escaping from the nozzle orifice 4 is ignited, and then, reducing the consumption of the oxidizer, the flame is drawn into the combustion chamber 2. By increasing the consumption of fuel components and raising the pressure in the combustion chamber 2, the device is brought to the operating mode. During operation, the nozzle unit 3 and the combustion chamber 2 are cooled by an oxidizing agent, which is supplied from the pipe 12 to the annular channel 13 between the housing 1 and the combustion chamber 2. Part of the oxidant through the holes 15 enters the chamber 2 of the combustion, cooling its internal surface. A smaller portion of the preheated oxidant moves to the lid 5, where through the window 14 enters the prechamber 9 and mixes in it with gaseous fuel, which enters the cavity 7 of the element 8 through the openings 11. The resulting fuel mixture burns in chamber 2 and expires through nozzle 4 as a supersonic jet of gas that treats the surface of mineral media. The use of the invention will reduce fuel consumption and increase the service life of the device. Claims of the Invention The device for fire-blasting treatment of mineral media according to auth.St. No. 734408, characterized in that, in order to reduce fuel consumption and increase service life, the cone-shaped pollen element is provided with a branch pipe located inside it, connected at one end to the fuel supply channel and located at the other, open end, near the bottom of the cone-shaped element. Sources of information taken into account in the examination 1. USSR author's certificate No. 734408, cl. E 21 C 21/00, 1977 (prototype).