SU924370A1 - Device for thermically breaking mineral media with jets of high-temperature gas - Google Patents

Description

The invention relates to the fire-treatment of mineral media and can be used for drilling holes in rocks, destroying oversize, processing the surface of a block stone, cutting and burning holes ⁵ in concrete and reinforced concrete structures.

A device is known for thermally destroying mineral media by jets of high-temperature gas that is half thought when burning a mixture of fuel with a gaseous oxidant. It contains communicating with the source of the gaseous oxidant drill rod, passing inside ^ ue fuel supply line, attached ^; to the drill rod housing, in which with an annular gap is placed communicated with the cavity of the rod of the combustion chamber & with the nozzle at the outlet and the swirler to skip the oxidizer at the entrance, through which the fuel supply line is passed, while the combustion chamber ·

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The device is connected to the cavity of the drill rod through a swirler, and the output end of the fuel supply line is located in the combustion chamber in the immediate vicinity of the swirler.

A disadvantage of this device is the low intensity of combustion of the fuel mixture due to the low quality of its preparation. This is because the fuel entering the combustion chamber in the form of a jet can be crushed and mixed with an oxidizer only for a long time, which entails an unreasonable increase in the length of the combustion chamber, a low intensity of the combustion process and incomplete combustion of the fuel mixture.

. The device closest to the technical essence and the achieved result for the thermal destruction of mineral media by jets of high-temperature gas contains a drill rod 3 924370 4 communicated with a source of gaseous oxidizer.

a gu, a cylindrical fuel supply line passing inside it, the end of which has a slit shape in cross section, and a housing connected to the drill rod, in which a combustion chamber with a nozzle at the outlet C2] is provided with an annular gap with a nozzle at outlet C2].

The disadvantages of this device are low efficiency of fuel use, which is caused by incomplete combustion, as well as low reliability in operation.

The purpose of the invention is to increase fuel efficiency by '5 due to the increase in the completeness of its combustion and increase the reliability of the device.

To achieve this goal in a device for the thermal destro- * 20 sheniya mineral jets of high temperature gas environments containing oxidant gas communicating with the source of the drill rod extending inside cylindrical Ma- ²⁵ gistral supply fuel, whose end has a cross sectional shape of the slit, and connected to a drill rod, a housing in which a combustion chamber with an outlet nozzle communicated with the cavity of the boom is placed with an annular gap on the cylindrical fuel supply line at its outlet to ontsa, a droplet-shaped body is rigidly planted with apex towards 35 of the oxidant flow and forming an annular gap with the inner surface of the combustion chamber, the minimum cross-sectional area of which is equal to the critical section area of the nozzle, 40

Moreover, the drop-shaped body is made of heat-conducting material, such as red copper.

The drawing shows the device, a longitudinal section .. ⁴⁵

The device consists of a housing 1, which is attached to the drill rod 2,

The housing 1 is placed · with an annular gap 3 combustion chamber 4, having at the outlet the nozzle 5 with a calibrator. ⁵⁰ Inside the drill rod 2 passes the line 6 of the fuel supply to the combustion chamber 4.

On the cylindrical part of the output end of the line 6, ⁵⁵ coaxially to the combustion chamber 4 are rigidly planted and, with an annular gap 7, the body 8 is drop-shaped, the top of which is directed opposite to the flow of gaseous

The oxidant that comes from the source through the cavity 9 “The cross-sectional area of the annular gap 7 is equal to the critical section area 10 of the nozzle 5. The drop-shaped body 8 is made of heat conductive material, such as red copper. The output end 11 of the fuel supply line 6 has a slit shape in cross section, the area of which decreases in the direction of fuel movement. The combustion chamber 4 is cooled by water supplied to the annular gap 3 between it and the housing 1.

Device works as follows about- at once. Oxidizing agent and fuel are served WITH " responsibly by drilling rig rod 2 what

cut cavity 9 and line 6 in Kama · * ru 4 combustion, while the oxidizer passes through the annular gap 7 between the combustion chamber 4 and the drop-shaped body 8.

Water for cooling the combustion chamber 4 and the housing 1 enters through the annular gap 3. The cross-sectional area of the annular gap 7 (established experimentally) should be equal to the critical section area 10 of the nozzle 5 ·

If it is larger than the nozzle throat area, the flow rate decreases and the combustion process worsens. If it is smaller than the nozzle throat area, there is a decrease in intracameral pressure, which adversely affects the processing performance.

Getting into the combustion chamber 4, the oxidizer sprays and grinds a flat jet of fuel coming through line 6 formed by the output end 11. The resulting fuel mixture is ignited by any suitable means and burns with the release of thermal energy, part of which is converted into kinetic in nozzle 5.

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From the nozzle 5, the combustion products expire in the form of a high-temperature over-sound gas jet, which performs work to destroy the obstacle. The installation of the body 8 of a drop-shaped form * in the path of the oxidizer stream · contributes to a more complete combustion of the fuel mixture, since the oxidizer stream is turbulized, encountering on its own

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path obstruction, mixed with crushed droplets of fuel. Thus, better preparation of the fuel mixture is carried out.

In addition, a reduced pressure zone is formed in the combustion chamber behind the drop-shaped body, into which the combustion products rush in countercurrent, which increases their residence time in the combustion chamber and ensures>> 0 aether steady burning without flame breaks.

The magnitude of the cross-sectional area of the annular gap 7 between the drop-shaped body 8 and the inner surface of the combustion chamber 4 is determined experimentally.

A drop-shaped body is rigidly planted on the cylindrical part of the fuel supply line at its exit 20 end.

This increases the life of the body, as it is well cooled by the fuel that passes inside the highway, and thus increases the reliability of the proposed devices.

The invention allows to reduce fuel consumption and increase the reliability of the device.

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Claims (2)

Claim 1. A device for thermal destruction of mineral media by jets of vy- ₃₃ low temperature gas containing a drill rod connected to a source of oxidant gas, a cylindrical fuel supply line passing inside it, the end of which has a slit shape in cross section and a housing connected to the drill rod with an annular gap with a nozzle connected to the rod cavity. at the outlet, characterized by the fact that, in order to increase fuel efficiency by increasing the combustion efficiency and increasing the reliability of the device, it is At the outlet end of the fuel supply line, a droplet-shaped body is rigidly planted with the tip opposite the oxidizer flow and forming an annular gap with the inner surface of the combustion chamber, the minimum cross-sectional area of which is equal to the critical section area of the nozzle. 2. The device according to claim. ^, Characterized in that the drop-shaped body is made of red copper.