SU626336A1 - Apparatus for gas combustion in rotary furnace - Google Patents

Description

one

The invention relates to the production of refractory and building materials, and can also be used in the electrode and electric-coal industry in the high-temperature heat treatment of raw materials in rotary kilns.

A known gas burner for rotary kilns, including an outer air supply and an inner gas supply pipe, in which the outer pipe is made with a nozzle having openings radially mounted at an angle of 45-60 ° to the walls of the furnace 1.

During the operation of such a burner, the jets of combustion products consumed from separate radially arranged holes affect not only the material in the nets but also the open surface of the lining, which leads to its softening and, as a result, accelerated wear in the high-temperature zone of the furnace . In addition, this burner cannot be used in those cases when it is necessary to create a sufficiently extended high temperature zone.

The closest to the invention in technical essence and the achieved result is a device for burning gas in a rotary kiln, mainly

for firing lumpy materials containing a cantilever internal burner with nozzles and gas and air pipes 2 connected to it. 5 Burner nozzles are placed at the surface lining, their axes are tangential to the internal surface of the furnace perpendicular to its axis.

However, with the specified location of the mount and the described orientation of the nozzles ,. Combustion products slide directly over the furnace lining surface, which causes rapid wear of the lining and limits the use of this device for high-temperature processes, and when baking materials that do not form a suspension, such a device does not provide a sufficiently intensive heat exchange between the combustion products and the calcined material.

0 The purpose of the invention is the intensification of heat exchange between the combustion products and the calcined material, as well as the increased durability of the furnace lining. The goal is achieved by the fact that

5 in a device for burning gas in a rotary kiln, mainly for firing lump materials, including a cantilever torch with inside the burner and tubes connected to it inside

0 for supplying gas and air, the nozzle axis is directed along the diameter of the furnace, constituting with the vertical plane passing through the longitudinal axis of the furnace, an angle of 35-45 ° along the rotation of the furnace, and the distance from the nozzle cuts to the lining is

13

 internal diameter of the furnace.

about 4

FIG. Figure 1 shows the proposed device in a rotary kiln, which is given with a partial cut-out; in fig. 2 is a section A-A in FIG. one.

In the rotary kiln 1, the burner 2 with nozzles 3 is cantilevered. The burner

2 contains a pipe 4 for supplying air and an internal pipe 5 for supplying gas. The nozzles 3 are installed along the length of the furnace 1. The axes of the nozzles 3 are directed along the diameters of the furnace 1, constituting with the vertical plane passing through the longitudinal axis of the furnace 1, angle a, the corresponding angle}. of the repose of the material to be trimmed 6. The distance from the nozzle cuts 3 to the lining

13

7 the furnace is internal

furnace diameter 1, and from the surface of the calcined material 6 nozzle sections 3 are spaced apart by distance I, determined depending on the distance between the nozzles L.

The device works as follows.

When the furnace 1 is rotated according to arrow B, the location in it of the b material b is determined by the angle of repose of this material, which for most bulk and lump materials is in the range of 35-45 °. Since the axis of the nozzles

When mounted, they are oriented in the manner described, the products of combustion fall approximately in the middle of the slope formed by the material 6 during the rotation of the furnace 1, perpendicular to its surface.

In addition, the streams of combustion products from adjacent nozzles 3 overlap at the surface of material 6. Upon reaching the surface of the material being blasted, the heated products of combustion have a normal velocity component to it, directed approximately to the middle of the slope formed by material 6 when the furnace rotates and due to this not only affect the open surface of the material, but also penetrate deep into it, which contributes to the intensification of heat exchange between the combustion products and the calcined material.

The proposed positioning of the burner 2, the placement and orientation of the nozzles 3 exclude the direct effect of the combustion products on the lining of the furnace 1 and thereby provide for the extension of its service life.

Claims (2)

Invention Formula A device for slashing gas in a rotary kiln, mainly for burning lumpy materials, containing a burner with nozzles cantilevered inside the furnace and nozzles connected to it for supplying gas and air, characterized in that, in order to intensify heat exchange between the combustion products and the material to be blasted as well as increasing the resistance of the furnace lining, the axis of the nozzles are directed along the diameter of the furnace, constituting with the vertical plane passing through the longitudinal axis of the furnace, an angle of 35-45 °, and the distance from the sections of the nozzles to lining is - :: inside lero about 4 diameter nechi. Sources of information taken into account during exertization 1. USSR author's certificate L 153438, cl. F 27B 7/36, 1961. 2. USSR author's certificate number 160094, cl. F 27B 7/36, 1962. CMM Gas. sh  § 00 V /  : BUT-/ : kv /