SU1101538A1 - Apparatus for thermal breaking of minerals with gas jets - Google Patents

Abstract

1. A DEVICE FOR THERMAL DESTRUCTION OF MINERAL MEDIA BY GAS JETS, containing a combustion chamber with an annular gap in the casing with a nozzle outlet at the outlet for the flow of hot gases and a lid on the inlet having heatsinked sideways for supplying the combustion chamber to the combustion chamber and entering the combustion chamber into the combustion chamber with a lid on the inlet, which has helical lines on the side to feed the combustion chamber into the combustion chamber. fuel mixture, characterized in that, in order to ensure optimum operating conditions, the total flow area of the fuel mixture feed channels is 0.120, 16 critical sections nozzle openings. 2. An apparatus according to claim 1, characterized in that the body in the region of the nozzle orifice is attached at an angle of 30 °. to its axis a branch pipe for supplying a gaseous oxidizer in i is an annular gap between the combustion chamber and the housing. (L

Description

ate

SA CX

The invention relates to a device for thermally destroying mineral media with gas jets and can be used, in particular, for thermo-abrasive cleaning of surfaces of concrete products and natural stone.

A device for thermally destroying mineral media with gas jets is known, having a combustion chamber arranged with an annular gap in the housing, into which the fuel mixture is obtained, which is obtained by mixing a liquid fuel and an oxidizing gas in the annular space between the combustion chamber and the housing. When this pipe supply of fuel is located in the transverse direction to the axis of the housing 1.

However, in this design of the device, it is not possible to obtain sufficiently uniform mixing of the fuel and the oxidant, due to which incomplete combustion of the fuel mixture occurs.

Closest to the invention is a device for thermally destroying mineral media with gas jets, containing a combustion chamber with a nozzle outlet at the exit for hot gases and a lid at the inlet, which has helical channels located on the side of pre-prepared fuel mixture combustion chamber. The fuel mixture is fed into the combustion chamber at a rate greater than the speed of propagation of the combustion front of this mixture. Due to the rotational movement of the injected fuel mixture, a heat insulating layer is formed along the walls of the combustion chamber and a good quality of its displacement is achieved, as well as the most complete combustion 2.

The purpose of the invention is to provide optimal operation modes of the device.

This goal is achieved by the fact that in a device for thermally destroying mineral media with gas jets including a combustion chamber with an annular gap in the housing with a nozzle opening at the exit for hot gases and a lid at the inlet having helical channels located on the side supplying the previously prepared fuel mixture to the combustion chamber; the total flow area of the channels for supplying the fuel mixture is 0.12-0.16 critical section of the nozzle orifice.

With such a general cross-section of the channels, it is advisable to attach to the body in the zone of the nozzle orifice at an angle of 30 ° to its axis a branch pipe for supplying the gaseous oxidant to the annular gap between the combustion chamber and the body.

The drawing shows a device for thermally destroying mineral media with gas jets.

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The device has an amer 2 combustion located in the housing 1 "with an annular gap 3 relative to it. At the outlet, the combustion chamber 2 is provided with a nozzle orifice 4 for the outflow of gaseous combustion products, and at the inlet is closed with a lid 5 having channels 6 on the side that are located along a helical line and serve to supply the fuel mixture to the space of the combustion chamber 2. The total flow area of the channels 6 is 0.12-

0.16 from the critical section of the nozzle orifice 4, and the helix pitch of the channels 6 is equal to 1.4-1.5 times the critical section diameter of the nozzle orifice 4.

Along the axis of the device through the lid 7 of the housing 1 and the cover 5 of the chamber 2 of combustion

pipeline 8 passes to introduce abrasive material into the exhausting gas jets. The lid 5 on the side of the combustion chamber .2 at the entrance of the pipeline 8 has a conical shape of the recess 9.

5 A pipe 10 for supplying a liquid fuel and pipe 11 for supplying a gaseous oxidizer B are attached to the housing 1; an annular gap 3, where the formation of the fuel mixture takes place, which is then introduced into the space of the combustion chamber 2. In the side wall of the combustion chamber 2 there are holes 12 for the passage of the oxidant.

For better mixing and cooling of the nozzle orifice 4, the nozzle 11 is oriented at an angle of 30 ° to its axis.

The device works as follows.

At start-up, the liquid fuel through the pipe 10 is supplied to the outer surface of the combustion chamber 2, spreads over it, evaporates and moves with the gaseous oxidant, which is introduced into the annular gap 3 through the pipe 11. The fuel mixture formed in the annular gap 3 flows through channels 6 in the cover 5, into the space of the combustion chamber 2, where it ignites and burns. The products of combustion emanate from it through the nozzle orifice 4, causing destruction of the surface of the mineral medium. The destruction efficiency is increased when the abrasive material is fed through the conduit 8 to the outgoing gas stream.

 As a result of the proposed device implementation, the processing capacity with its help increases 1.35 times with the same fuel and oxidant consumption. The reactivity of the gas jet increases by 27 ° / o, the launch reliability increases by 27 "/ o.

Claims (2)

1. DEVICE FOR THERMAL DESTRUCTION OF MINERAL MEDIA BY GAS JETS, containing a combustion chamber with an annular gap in the housing with a nozzle opening at the outlet for the discharge of hot gases and an inlet cover having channels pre-prepared for supplying the combustion chamber to the combustion chamber fuel mixture, characterized in that, in order to ensure optimal operating conditions, the total flow area of the channels for supplying the fuel mixture is 0,120,16 critical section of fishing hole. 2. The device according to π. 1, characterized in that the nozzle for supplying a gaseous oxidizer to the annular gap between the combustion chamber and the housing is attached to the housing in the area of the nozzle hole at an angle of 30 ° to its axis.