SU1557440A1 - Drum furnace - Google Patents

Abstract

The invention relates to thermal equipment, in particular to furnaces for drying and calcining powdered product, such as aluminum powder, high-quality dyes, tungsten oxide, manganese, mortars, sand, and can be used in the chemical and metallurgical industries. The purpose of the invention is to increase the efficiency of using waste heat from the furnace, simplifying the design of the furnace and reducing its dimensions. For this, the loading end of the rotating drum 1 is made perforated and placed inside the loading hopper 3 with a gap relative to its inner surface, the grooves 8 of the loading end of the drum are located along its generator and are blocked by blades 9 rigidly attached along the generator. The blade width is 0.1 - 1.1 slot width. The shell 11 with grooves 12, coaxially with the grooves 8 of the drum, is installed inside it with the possibility of rotation and is made with a diaphragm 13 with holes 14 along the periphery. 4z.p. f-ly, 4 ill.

Description

10 .2

ten

20

The invention relates to thermal equipment, in particular, to furnaces for drying and calcining powdered product, such as aluminum t-powder, high-quality dyes, tungsten oxide, manganese, mortars, sand, and can be used in the chemical and metallurgical industries.

The purpose of the invention is to increase the efficiency of using waste heat from the furnace, simplifying the design of the furnace and reducing its dimensions.

Figure 1 shows the drum furnace, $ general view; figure 2 - section aa in figure 1; on fig.Z - view B in figure 2; figure 4 - node I in figure 1.

The drum furnace contains a rotating drum 1 installed inside the heating chamber 2. Along the ends of the drum 1 there is a loading hopper 3 and a unloading chamber - the unloading tray k. The ends of the drum protruding from the heating chamber are made with lined covers 5, while the loading end of the drum is perforated and placed inside the loading bin 3 with a gap 6 relative to its inner surface. On the axis of the drum 2 to the wall of the hopper 3 rigidly attached system 7 removal of the vapor-gas medium. The boot end of the drum can be made with grooves 8, located along its generatrix, and blades 9, overlapping grooves and one side attached along the generator of the drum. The width of the blades 9 is 0, the grooves 8.

Making blades less than 0.9 width of the groove 8 may result in excessive uncontrolled flow of product into the inner volume of the drum 1. When blades 9 are wider than 1.1 width of the groove, it is possible that the product gets stuck between the blade 9 and the outer surface of the drum 1. The blades are grooved 8 (holes). On the shell 11, a diaphragm 13 s from the circumference k is set along the periphery. The radial runout of the drum 1 is compensated on the hopper 3 by the spring system 15, and tightness is ensured by the mechanical seal 16 with the spring element 17. To eliminate the thermal effect on the sliding node 18 of the hopper 3, the space 19 is lined.

Drum oven works as follows.

The product to be processed is loaded from into the hopper 3. When the drum 1 rotates, the product is caught by the vanes 9 into the grooves 8. A part of the product rolls along with the drum 1 in the gap of the heat coming through the walls of the drum 1. When the blade 9 is lifted, the already warmed up particles of the product enter the internal cavity of the rotating drum 1. In order to prevent heat from being released into the environment, the area of the rotating drum from the heating chamber 2 to the hopper 3 and tray k is blocked by futtered covers 5. Drop The internal volume of the rotating bar is 1, the product actively interacts with the gases leaving the process zone, which contributes to its drying. The steam / gas mixture is discharged through the outlet system 7. In order to regulate the process of entering the drum into the internal cavity of the drum depending on its filling ratio by rotating the shell 11, due to the displacement of the groove 12 relative to the grooves 8, a gap is necessary. To increase the residence time of the product in the volume of the drum placed in the hopper 3, a diaphragm 13 seconds from k is installed at the shell 45 ke 11 for passage of the product into the active zone of drum 1 and for moving the heated gas out of it. After heating and partial drying in the zone

25

thirty

35

40

The width of the groove 0.9–1.1 ensures that the product is fed into the active product intake in a fraction of up to 15 mm with humidity up to 15% of the angular velocity of rotation of the drum 1.

Between the drum 1 and the other side of the blades 9 there is a gap 1Q.

Inside the rotating drum 1 is installed with the possibility of rotation of the shell 11 with grooves 12, coaxially

55

The first part of the drum 1, where it passes through all the technological zones and through the discharge tray k, enters the following operations. In order to create a tightness, the hopper 3 with the spring element 17 constantly tightens the end seal 16. Compensation of the radial beating of the sliding unit 18 is provided with a spring suspension

0

$

with 8 slots (holes). On the sidewall 11, a diaphragm 13 is installed with holes k at the periphery. The radial runout of the drum 1 is compensated on the hopper 3 by the spring system 15, and tightness is ensured by the mechanical seal 16 with the spring element 17. To eliminate the thermal effect on the sliding node 18 of the hopper 3, the space 19 is lined.

Drum oven works as follows.

The processed product is loaded into the hopper 3. When the drum 1 rotates, the product is caught by the vanes 9 into the grooves 8. A part of the product rolls along with the drum 1 in the gap, extracting heat coming through the walls of the drum 1. When the blade 9 is lifted, the already warmed up particles of the product enter the internal cavity of the rotating drum 1. In order to prevent heat from escaping into the environment, the area of the rotating drum from the heating chamber 2 to the hopper 3 and tray k is covered with lined covers 5. Fall into the internal volume of the rotating drum 1 , the product actively interacts with gases from the process zone, which contributes to its drying. The steam / gas mixture is discharged through the outlet system 7. To regulate the process of product entry into the internal cavity of the drum, depending on its filling ratio, by rotating the shell 11, by displacing the grooves 12 relative to the grooves 8, it provides the necessary clearance. To increase the residence time of the product in the volume of the drum placed in the hopper 3, a diaphragm 13 with holes k is installed on the shell 11 of the container 11 for the product to pass into the active zone of the drum 1 and to exit the heated gas from it. After heating and partial drying in the zone

five

0

five

0

five

The first part of the drum 1, where it passes through all the technological zones and through the discharge tray k, enters the following operations. To create tightness, the hopper 3 with the spring element 17 constantly tightens the mechanical seal 16. Compensation of the radial thrust of the sliding unit 18 is provided with a spring suspension

15. In order to reduce the temperature on the slide assembly 18 and the mechanical seal 16, the space 19 also has a lining.

The arrangement in the loading hopper of the protruding end of the rotating drum allows the heat transferred through the walls of the drum and with the exhausting vapor-gas medium to be consumed to heat the product inside the bunker and entering the drum. The presence of a gap between the rotating drum and the inner surface of the hopper provides more complete heat transfer to the product. By making the loading end with grooves covered by blades in the area of the loading hopper, the material is fed into the inside of the drum. The amount of product intake is regulated by a shell with grooves coaxial with the drum grooves, and setting the diaphragm with holes around the periphery allows you to create an intense vapor-gas mixture only in the loading zone, not spreading it into the heating zone and the following process zones.

Claims (3)

Invention Formula 1. Drum oven containing heating chamber with installed a rotating drum inside it, a loading hopper, an unloading chamber, a vapor-gas extraction system, characterized in that, in order to increase the efficiency of using the waste heat from the furnace, simplify the furnace design and reduce its dimensions, the loading end of the drum is perforated and placed inside the hopper with a gap relative to its inner surface. 2. The furnace according to claim 1, differs by the fact that the loading end of the drum is made with grooves located along its generatrix and the blades fixed to them, rigidly attached along the generatrix of the drum 20. 3. The furnace according to claims 1 and 2, about t l and often with the fact that the blades are made with a width of 0.9-1.1 width of the grooves. “The furnace according to PP.1 and 2, about tl and - with the fact that it is equipped with a shell installed with the possibility of rotation inside the drum with grooves coaxial with the boot slots end of the drum. 5. The furnace according to Clause 3, characterized in that the shell is provided with a diaphragm installed at its end with openings at the periphery. Pi / a 1 MB / 9 FIGA Ј f6