RU177653U1 - ROTATING FURNACE - Google Patents

Abstract

The utility model relates to devices for the heat treatment of materials that do not allow contact with the coolant, for example, for firing powdered materials, and can be used in chemical engineering to obtain catalysts. Technical results achieved: - increased efficiency of the drying process of the processed material with coolant; - expansion of the product range . The solution of these problems is achieved in a rotary kiln containing a drum made with the possibility of rotation, and a stationary casing with channels coolant installed externally concentrically to the drum, characterized in that the stationary casing is formed by the outer shell, the cavity between it and the drum is divided by alternating concrete and brick partitions into several sections, each section having a coolant channel with at least one inlet and one outlet branch pipe. Each coolant channel can have two inlet branch pipes and one outlet branch pipe. The coolant channels can be made annular and interconnected by input and output collectors. The coolant channels can be made in a spiral shape and are each connected to the inlet and outlet pipes. 3 c.p., ill. 9.

Description

The utility model relates to devices for the heat treatment of materials that do not allow contact with a coolant, for example, for firing powdered materials, and can be used in chemical engineering to obtain catalysts.

Known high-temperature rotary kiln with combined lining, where due to the use of the muffle, which is also the lining of the kiln, combined with the furnace of the furnace, and above the channels for the passage of coolant gas, channels for supplying secondary air to the furnace furnace are adjacent to the rotary body of the drum, moreover secondary air channels are made with an internal relief consisting of longitudinal wave-like recesses along the length of the channels — heat losses and specific fuel consumption are reduced (see description of the invention of the patent of the Russian Federation No. 2112189, IPC F27B 7/28, F27B 5/10, publ. 05.27.1998).

A disadvantage of the known design is the complexity, which lies in the walls with built-in channels and in the furnace, built into the end of the muffle.

Known muffle furnace according to the patent of the Russian Federation for utility model No. 56878, IPC F27B7 / 28, publ. 09/10/2006 g, prototype.

This furnace contains a drum rotating from the drive in the frame supports, at least one burner device connected to the channels for supplying combustible material and air, and the coolant passage channel, provided with a fixed casing rigidly fixed to the frame, while the burner device is installed inside the passage channel coolant, made in the form of a cavity formed by the outer surface of the drum and the inner surface of the stationary casing, the axis of the drum rotating in the frame supports is inclined to the horizontal at an angle α, and the outer Thread drum surface and the inner surface of the fixed cover made congruent. In addition, the channels for supplying combustible matter and air can be fastened to a fixed casing, the channel for supplying air can be connected to the passage of the coolant passage. The drum drive can be made with a variable angular rotation speed, and at least one drum support can be equipped with means for changing the angle α.

The burner device can be made in the form of a spiral tube mounted on the inner surface of the fixed casing, connected to the channel for supplying combustible material and provided with at least one hole in the side surface for the outlet and combustion of the combustible substance.

Disadvantages: low efficiency - drying efficiency due to the fact that the combustion does not have time to complete in the coolant channels. Technical results achieved:

- increase the efficiency of the drying process of the processed material with a coolant;

- expansion of the product range.

The solution of these problems was achieved in a rotary kiln containing a rotary drum and a fixed casing with coolant channels installed externally concentrically to the drum, characterized in that the fixed casing is formed by the outer shell, the cavity between it and the drum is divided by alternating concrete and brick partitions into several sections, with each section having a coolant channel with two inlet and one outlet pipe.

The coolant channels can be made annular and interconnected by input and output collectors.

The coolant channels can be made in a spiral shape and are each connected to the inlet and outlet pipes.

The essence of the utility model is illustrated by drawings (Fig. 1 ... 9) where:

- in FIG. 1 shows a longitudinal section of a rotary kiln,

- in FIG. 2 shows a first embodiment of a furnace section,

- in FIG. 3 shows a second embodiment of a furnace section,

- in FIG. 4 shows a third embodiment of a furnace section,

- in FIG. 5 shows a fourth embodiment of a furnace section,

- in FIG. 6 shows a fixed housing,

- in FIG. 7 shows the longitudinal connector of the fixed casing,

- in FIG. 8 shows a diagram of the movement of the coolant,

- in FIG. 9 shows a section aa.

The rotary kiln (Fig. 1 ... 9) contains: frame 1, drum 2, made for rotation and mounted through supports 3 and 4 on frame 1. At one end of the drum, a loading unit 5 is made, and on the other, a unloading unit 6.

A gear ring 8 is mounted on the outer surface 7 of the drum 2, to which a gear motor 9 is connected. Drum 2 is installed at an angle a to the horizontal.

The optimal value of the angle:

α = 3 ... 10 °.

A concentric rotating drum 2 has a fixed casing 10, made in the form of a shell 11 in the cavity 12, between which and the drum 2 are installed alternating concrete and brick partitions 13 and 14, respectively, forming sections 15 (Fig. 1 ... 5). In the sections 15, the coolant channels 16 are made. The coolant channels 16 are connected on the one hand with the inlet pipes 17, and on the other hand with the outlet pipes 18. Inside the drum 2, the processed material 19 is filled up (Fig. 1).

In this case, two options for connecting the channels of the coolant 16 with the input and output collectors 20 and 21, respectively (Fig. 2 and 3) in the form of annular channels (Fig. 2) and in the form of a spiral (Fig. 3).

In addition, it is possible to use in one section 15 two inlet nozzles 17 and one outlet nozzle 18 (Fig. 4) or one inlet nozzle 17 and two outlet nozzles 18 (Fig. 5). 6 shows a fixed casing 10 divided into sections 15.

The fixed casing 10 (Fig. 7) may have a longitudinal connector 22. In this case, it has two longitudinal flanges 23 and 24, fastened by bolts 25 with nuts 26. The shell 11 in this case contains an upper part 27 made in the form of a half cylinder and a lower part 28 in the shape of a rectangular parallelepiped.

In FIG. 8 shows a diagram of the movement of the coolant in the channels of the coolant 16.

In FIG. Figure 9 shows a section AA, from which it follows that the coolant is distributed in each section by a concentric front (corresponding to the width of the flame) from the burners 29, flowing around the drum 2 from below from above and from above, and the gases exit to the outlet pipes 18.

Rotary kiln operation

A rotary kiln operates as follows (Fig. 1). Through the loading unit 5, the processed material 19 is poured into the drum 2. In this case, the drum 2 rotates in the supports 3 and 4 of the frame 1 due to the gear motor 9 through the ring gear 8. Passing inside the coolant channel 16, the heat carrier heats the drum 2, while the contact of the heater and the processed material 19 does not occur. The spent coolant exits through the outlet pipes 18.

The angle a of the inclination of the axis of the drum 2 to the horizontal is selected depending on the speed of rotation of the drum 2, the temperature regime and the duration of the heat treatment of the processed material 19. The processed material 19, which has been processed, is removed from the muffle furnace through the unloading unit 6 (Fig. 1).

The maximum heating temperature of the muffle furnace is determined by the heat resistance of the materials of the drum 2 and refractory bricks installed inside the stationary casing 10.

In real prototypes of the furnace, combustion products are used as the heat carrier and the temperature of the heat carrier is 650 ° ... 700 ° C.

In the process of rotation of the drum 2, the processed material 19 rises by the wall of the drum 2 to a certain height due to the friction forces. At a certain height, the processed material is poured down. Since the axis of the drum 2 is inclined at an angle, pouring down occurs with a shift of the processed material toward the slope of the drum 2. In the process of movement, the processed material 19 dries by supplying heat inside the drum 2 from the side of the stationary casing 10.

The heat supply circuit (Fig. 8 and 9) provides effective drying of the processed material 19 at the minimum cost of fuel supplied through the burner 29.

A prototype of a rotary kiln was created and its successful tests were carried out.

Application of the utility model allowed:

- increase the efficiency of the drying process of the processed material with a coolant;

- expand the range of products (rotary kilns).

Claims (3)

1. A rotary kiln comprising a rotary drum and a fixed casing with coolant channels mounted concentrically to the drum from the outside, characterized in that the fixed casing is formed by an outer shell, the cavity between it and the drum is divided into several sections by concrete and brick partitions, in addition, each section has a coolant channel with two inlet and one outlet pipe. 2. A rotary kiln according to claim 1, characterized in that the coolant channels are ring-shaped and interconnected by input and output collectors. 3. A rotary kiln according to claim 1, characterized in that the coolant channels are made in a spiral shape and are each connected to the inlet and outlet pipes.

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