FI60779B - ANORDINATION FOR AVLAEGSNANDE AV VAERME FRAON CYLINDRARNA AV EN REKUPERATORKYLARE I EN ROTERUGN - Google Patents

Description

I55r * l ΓβΙ m, ICULATION PUBLICATION ^ 0779 lJ 11 UTLÄGG NINGSSKRI FT OV f /? C (45) Pa exam diy innc tty 10 03 1922

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Patent and Registration Office ............. , .

__. . . ^ ^ (44) Date of issue | -

Patent and registration 7 AntOun utltgd oeh utl.skrtftun pubhcurad 30.11.8l (32) (33) (31) Pyrduttjr utuolkuui - Bugird priorfcct (71) Gosudarstvenny Vsesojuzny Institut po Proektirovaniju i Nauchno-Issledovatelskim ,

Kharkov, USSR (SU) (72) Leonid Tobiasovich Vorobeichikov, Kharkov, Boris Fedorovich Fedoryakin, Kharkov, Grigory Konstantinovich Panchenko, Bakhchisarai Krymskoi oblast, Grigory Nikolaevich Gorbanev, Bakhchisarai Krymskoi oblasti, Anatoly Nak , USSR (SU) (7M 0y Kolster Ab (5 * 0 Apparatus for removing heat from the cylinders of the recuperative condenser of a rotary kiln,

The invention relates to the cooling of a rotary kiln shell and, more specifically, to a device for removing heat from the cylinders of a rotary kiln recuperator cooler.

A device is known in the art for cooling the shell of a rotary kiln and comprising a tubing coil arranged around the shell of the kiln, whereby a space is formed between them. A refrigerant such as water circulates through the piping. The pipes are attached to the support members. Spacers are installed above the pipes.

Since there are no support rings in the device structure, it is impossible to ensure an exactly concentric arrangement of the pipes. Improper orientation of the tubes leads to a deterioration of the heat exchange between the furnace shell and the tubes.

In addition, inspection of the furnace shell during use is impossible due to such a pipe arrangement. Furthermore, the pipe installation step requires considerable welding of the individual half-threads of the pipes. Dismantling the device 2 is also a time consuming operation. Because there is no sheath or insulation above the spacers, the spacers cool quickly in winter and are unable to radiate heat.

Also known is a device for removing heat from the housing of a rotary kiln recuperator cooler and comprising heat exchange tubes through which the coolant is to be circulated and which are attached in parts to support members surrounding the concentric kiln shell. The heat exchange tubes are attached to the support members so that they surround the circumference of the furnace shell, creating an annular space between the tubes and the jacket surface. To improve the heat removal efficiency, heat shields are fitted above each pipe section or directly into the pipes.

The main disadvantage of the device described above, when used in a recuperator cooler, is its low cooling capacity due to insufficient heat transfer areas of the pipes. In addition, the maintenance and repair of such a device is complicated because the thermal shields of the pipes make it difficult to inspect the radiator.

The object of the invention is to provide a device for removing heat from the cylinders of a recirculating furnace recuperative cooler, in which the heat exchange tubes are arranged so that their heat transfer range can increase while the installation and maintenance procedures of the tubes are simplified.

This object is achieved in a device for removing heat from the recuperator-cooler of a rotary kiln, comprising heat exchange tubes through which the coolant is intended to circulate and which are attached in parts to arcuate support members arranged in the longitudinal direction of the cooler. The device according to the invention is characterized in that the heat exchange tubes are attached to the side surfaces of the arcuate support members so that they circulate the surface of the radiator along a wavy line, whereby a space of varying cross-section is formed between them. Due to such an arrangement of heat exchange tubes and the space of varying cross-section between the cylinders and the heat exchange tubes, the heat exchange area is considerably increased, whereby a larger amount of heat is removed from the radiator.

This is because the heat transfer efficiency is affected by the surface area of the heat exchange tubes rather than their distance from the surfaces of the cooling cylinders.

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The maintenance of the device is also simplified because the space between the heat exchange pipes and the surface of the cooling cylinders has a different cross-section.

It is advantageous to install in the heat exchange pipes heat transfer elements which can rotate about their axes and which are made of a high-temperature-resistant material and which are periodically brought into contact with the surfaces of the cooling cylinders.

This enhances the heat transfer rate provided by the heat exchange tubes from the radiator.

The invention will now be described in more detail by way of example with reference to the accompanying drawings, in which Figure 1 shows a side view of a rotary kiln with an outlet end Fig. 3 shows a view of the unit A of Fig. 2 (the heat removal plates are mounted on the heat exchange pipes).

In particular, FIG.

The hot combustion material coming from the furnace 1 is transferred through the branch pipes 4 to the cylinders 3, where it is cooled by the air flow supplied to them. The cooled material is then transferred to a conveyor (not shown). During use, the glowing hot cylinders release a large amount of heat that is wasted into the atmosphere. In order to collect wasted heat, a device is arranged around the cylinders 3 to remove heat from the cylinders 3 of the radiator 2.

The device 5 according to the invention comprises heat exchange pipes 6 through which coolant flows. These tubes are fixed in parts to the side surface of the arcuate support members 7 arranged in the longitudinal direction of the radiator 2.

Each support member 7 is split and consists of two parts, an arcuate upper part, as shown in Fig. 2, and a lower part bearing, indicated by reference numeral 8 in Fig. 2, which is connected by a joint 460779 to an upper arcuate part. The heat exchanger tubes 6 are fixed to the side surfaces of the support elements 7 so as to rotate the surface of the radiator 2 along a wavy line, whereby a space "a" with a varying cross-section is formed between the cylinders 3 and the heat exchanger tubes 6. The heat transfer range can be increased by fitting the tubes along the wavy line and forming a space with a variable cross section.

The heat transfer tubes 6 (Fig. 3) are provided with axially rotating heat removal elements 10 made of plates of a high temperature resistant material and which are periodically brought into contact with the surfaces of the cylinders of the radiator 2. Since the tubes 6 are arranged along the wavy line, the heat transfer area is considerably increased, whereby an even larger amount of heat can be removed from the surfaces of the cylinders 3.

For cooling the branch pipes 4 (Fig. 1), the device according to the invention is provided with a heat removal piping 11, in which the space between the pipes is at least once the diameter of the pipe. One end of each tube 11 is attached to annular support members 12 attached to the shell of the furnace 1, the other end being attached to the last support member 7 as viewed away from the furnace. The covers 13 surround the surface of the tubes 11. An air line 14 is arranged around the shell of the furnace 1, which branches at 15 in the direction of the outlet tubes 4. The direction of the air flow is marked with an arrow "B" in the drawing. The air line 14 is connected to the pressure fan 16.

An insulating jacket 17 is arranged around the cylinders. The hot air stream sucked by the pressure blower 16 from the space between the jacket 17 and the cylinders 3 then passes through a pipe 18 for use in blowing and pressurizing the cylinders 3 and branch pipes 4 of the radiator 2.

The direction of the hot air flow is marked with an arrow "C" in the drawing.

The device according to the invention for removing heat from the cylinders of the recuperator cooler of a rotary kiln operates as follows.

The surface of the heat exchange tubes 6 absorbs the heat radiated by the upper part of each cylinder 3 of the radiator 2, while the rotating heat removal elements 10 absorb the heat radiated by the lower part of each cylinder 3.

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When the elements 10 arranged to rotate axially on the heat exchanger tubes are located in the spaces between the cylinders 3, they perform pendulum-like rotational movements, taking heat from the hottest part of the radiator and transferring it to the heat exchanger tubes 6 by convection or radiation with the surface and transfer heat to the cams 6, thus acting as heat conducting elements.

In order to cool the radiator outlet pipes 4 and to speed up the heat removal from the cylinders, air is periodically supplied alternately to the outlet pipes 4 and the heat removal elements 10. To facilitate this step, the branch pipes 15 are mounted in the air duct 14 so as to face the radiator As the radiator rotates, the air streams flow out of the branch pipes 15 and are periodically blown out of the branch pipes 4 and the elements 10.

As a result, the cylinders 3 are blown, whereby heat is released from them.

The air is blown by an air blower 16 which sucks air from the outside. If necessary, the air duct system can operate on the principle of recirculation, in which case it sucks in air without heat which has been transferred to the heat exchange pipes 6. The recirculation takes place by means of the inlet pipes 6. In areas where the outside air temperature is lower than e.g. -30 ° C, the device according to the invention can be placed inside the jacket 17.

It has been found that when the heat exchange tubes 6 are attached to the arcuate support members 7 along the wavy line, the heat transfer area increases at least 1.5 times compared to the previously known device.

The support members 7 can be removed together with the heat exchange tubes 6, since the tubes 6 are fastened directly to the support members and fastened by a connection 9 to the bearing base 8.