JPH09202656A - Preheating device for cement raw material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the heat exchange efficiency of a high-temperature gas with a cement raw material and enable the reduction in power of an exhauster by providing a preheating device for the cement raw material capable of uniformly diffusing the cement raw material dropped through a raw material introduction chute into a connecting duct. SOLUTION: This preheating device 3 for a cement raw material 4 is obtained by arranging a diffusing disk 23 for receiving the cement raw material 4 dropped through a raw material introduction chute (2b) so as to enable the nearly horizontal rotation in a connecting part 20 of a vertical part of a connecting duct (2a) rising upward from the center of the tip of a cyclone on the side of the lower stage, transversely bending in the course thereof and connected to the lateral part of a cyclone on the side of the upper stage to the raw material introduction chute (2b), extending from the lower end of a cyclone on the side of the upper stage downward and connected to the vertical part of the connecting duct (2a) on the side of the lower stage in the preheating device 3 for the cement raw material 4 equipped with the plural cyclones arranged in the zigzag form in the vertical directions.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cement raw material preheating device used in a cement manufacturing facility.

[0002]

2. Description of the Related Art FIG. 2 shows an example of a general cement production facility. A cement raw material preheating device 3 comprising a multistage cyclone 2 sucked by an exhaust fan 1 is used to convert a powdered cement raw material 4 into a high temperature gas 9x. The cement raw material 4 is preheated by exchanging heat with the preheated cement raw material 4 into the calcination furnace 5 arranged under the cement raw material preheating device 3 to calcination, and then into the cement firing furnace 16 composed of the rotary kiln 6. A cement clinker 7 is obtained by firing the cement clinker 7, and the obtained cement clinker 7 is a cooling device 1 including a great type cooler 8.
It is put in 7 and cooled.

More specifically, a plurality of cyclones 2 constituting the cement raw material preheating device 3 are arranged in a zigzag pattern in the vertical direction, and a connecting duct 2a rising upward from the center of the top of the cyclone 2 on the lower stage side. Is connected to the side part of the upper cyclone 2 by bending sideways in the middle, and the raw material dropping chute 2b extending downward from the lower end of the upper cyclone 2 is connected to the lower connecting duct 2a. Yes, the cement raw material 4 charged from the raw material inlet chute 2c connected to the uppermost connecting duct 2a is sucked by the exhaust fan 1 connected to the center of the top of the uppermost cyclone 2 to connect the cyclone 2 of each stage to the connecting duct 2a. While exchanging heat with the high temperature gas 9x rising therethrough, it is sequentially collected by the cyclone 2 at each stage and dropped into the lower calcination furnace 5.

Further, the rotary kiln 6 has a large tubular shape in which the calcination furnace 5 side is high and the cooling device 17 side is low, and it has a large pipe shape, and a plurality of longitudinal positions are supported on a pair of rotary drive rollers 18. The cement raw material 4 that has been calcinated in the calcination furnace 5 and supplied from the cement raw material preheating device 3 to the upper end side of the rotary kiln 6 is rotated by the rotary kiln 6. Move to the lower side of the rotary kiln 6
The cement burner 10 is burned by burning the burning burner 10 provided for
It is adapted to be charged into the cooling device 17 from the above.

Further, the cement clinker 7 dropped into the cooling device 17 is gradually sent to the right side in FIG. 2 by the reciprocating movement of the movable grid plate of the great type cooler 8,
The cement clinker 7 cooled by the cooling air 9 ejected from the slits of the movable lattice plate and cooled is taken out from the outlet of the great type cooler 8 at the right end.

On the other hand, a part of the air 9 heated to a high temperature by cooling the cement clinker 7 with the great type cooler 8 is used for burning the firing burner 10 of the rotary kiln 6, and the other part is used for the dust settling chamber 11. The excess air 9 on the low temperature side, which is used for combustion of the calcination burner 13 of the calcination furnace 5 through the combustion air inlet pipe 12 having the above, is discharged to the atmosphere from the chimney 15 via the electric dust collector 14. It has become.

In the cement raw material preheating device 3 used in such a cement manufacturing facility, the connecting duct 2a
The raw material dropping chute 2b is connected to the vertical portion of the connecting duct 2a extending in the vertical direction as shown in FIG. 3, and as shown in FIG. 4, the vertical portion of the connecting duct 2a is connected to the raw material. Connection part 2 with drop chute 2b
At 0, a long plate-shaped diffusion plate 21 for receiving the cement raw material 4 dropped from the raw material dropping chute 2b is movably inserted in a substantially horizontal direction, and the diffusion plate 21 is appropriately extended. It can be adjusted to.

That is, the downward inertial force of the cement raw material 4 falling from the raw material dropping chute 2b is mitigated by colliding with the diffusion plate 21, and the cement raw material 4 rises in the flow path 22 in the connecting duct 2a. It was designed to make it easier to ride the flow of the hot gas 9x.

[0009]

However, in the conventional structure as described above, even if the downward inertial force of the cement raw material 4 dropping from the raw material dropping chute 2b can be alleviated, the flow path 22 is raised. Since the action of positively diffusing the cement raw material 4 with respect to the flow of the high temperature gas 9x cannot be expected, the cement raw material 4 may be aggregated and input into the connection duct 2a. The raw material 4 falls because it cannot keep up with the flow of the high temperature gas 9x rising in the flow path 22, and the high temperature gas 9x
However, there is a problem that the heat exchange efficiency between the cement raw material 4 and the cement raw material 4 is significantly reduced.

The cement raw material 4 is placed in the connecting duct 2a.
The high temperature gas rising in the flow path 22 in order to prevent as much as possible the problem that the cement raw material 4 cannot fall into the flow of the high temperature gas 9x even if it is thrown in after being collected. There was also a problem in that the flow velocity of 9x had to be kept relatively high, and the power of the exhaust fan 1 had to be increased.

The present invention has been made in view of the above circumstances, and provides a cement raw material preheating device capable of evenly diffusing a cement raw material dropped from a raw material dropping chute and introducing the cement raw material into a connecting duct. It is intended to improve the heat exchange efficiency with the cement raw material and to reduce the power of the exhaust fan.

[0012]

DISCLOSURE OF THE INVENTION The present invention comprises a plurality of cyclones arranged in a zigzag pattern in the vertical direction and a cyclone on the upper side, which rises upward from the center of the top of the lower cyclone and bends laterally in the middle. Connected to the side of the cyclone, the raw material dropping chute that extends downward from the lower end of the upper cyclone and is connected to the vertical part of the lower connecting duct, and is connected to the top center of the uppermost cyclone. Equipped with an exhaust fan and a raw material inlet chute connected to the vertical part of the uppermost connecting duct, the cement raw material is preheated by the high temperature gas introduced from the cement firing furnace for firing the cement raw material through the calcination furnace. A cement raw material preheating device configured to obtain, in the connecting portion between the vertical portion of the connecting duct and the raw material dropping chute, the cement having dropped the raw material dropping chute. It is characterized in that it has arranged to be rotated substantially horizontally spreading disk for receiving the fee.

According to this structure, when the cement raw material is charged from the raw material inlet chute and the cyclone of each stage is heated by the exhaust fan to heat-exchange the high temperature gas rising through the connecting duct with the cement raw material, The cement raw material that is sequentially collected by the cyclones of each stage and drops from the raw material dropping chute is received by the rotating diffusion disk to reduce the downward inertial force, and the centrifugal force applied by the rotation of the diffusion disk. Therefore, it will be uniformly diffused and put into the connection duct.

Also, a diffusion disk for receiving the cement raw material dropped from the raw material inlet chute may be arranged at the connecting portion between the vertical portion of the uppermost connecting duct and the raw material inlet chute so that it can rotate substantially horizontally. It is possible.

[0015]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows an example of an embodiment for carrying out the present invention, and the parts denoted by the same reference numerals as those in FIG. 4 represent the same parts.

In the cement raw material preheating device 3 of the cement manufacturing facility constructed as in the case of FIG. 2 described above, the raw material dropping chute 2b is dropped onto the connecting portion 20 between the vertical portion of the connecting duct 2a and the raw material dropping chute 2b. The diffusion disk 23 for receiving the cement raw material 4 is arranged so that it can rotate substantially horizontally.

That is, the shaft 24 projecting downward from the center position of the lower surface of the diffusion disk 23 is connected to the connecting duct 2.
a gear 28 inserted into the dustproof box 25 fixed to the a side and rotatably supported by bearings 26 and 27 arranged in the dustproof box 25, and further fitted to the shaft 24; It has a structure in which a gear 31 externally fitted to an output shaft 30 of a drive motor 29 arranged outside the connecting duct 2a is connected via a chain 32 so that torque can be transmitted.

Thus, the cyclone 2 at each stage (see FIG. 2)
The cement raw material 4 which is collected by and falls on the raw material dropping chute 2b is received by the diffusion disk 23 rotated by the drive motor 29 to alleviate the downward inertial force, and is applied by the rotation of the diffusion disk 23. The centrifugal force is applied to the connection duct 2a so that it is evenly diffused and put into the connection duct 2a.

Therefore, according to the above embodiment, the cement raw material 4 dropped from the raw material dropping chute 2b can be uniformly diffused and injected into the connecting duct 2a, so that the high temperature gas 9x rising in the connecting duct 2a. The cement raw material 4 can be put on the flow of the cement very well, whereby the heat exchange efficiency between the high temperature gas 9x and the cement raw material 4 can be significantly improved, and the cement raw material 4 can be preheated well. it can.

Furthermore, if the cement raw material 4 can be put on the flow of the high temperature gas 9x rising in the connecting duct 2a very well, the flow velocity of the high temperature gas 9x rising in the connecting duct 2a can be made lower than before. Therefore, the power of the exhaust fan 1 (see FIG. 2) can be significantly reduced as compared with the conventional one, and the pressure loss of the cement raw material preheating device 3 as a whole can be significantly reduced.

Further, as shown by the reference numeral in parentheses in FIG. 1, a connecting portion 20 'between the vertical portion of the uppermost connecting duct 2a and the raw material inlet chute 2c (see FIG. 2).
As for the above, as in the case of the above-described embodiment, the diffusion disk 23 for receiving the cement raw material 4 dropped from the raw material inlet chute 2c can be arranged so as to be able to rotate substantially horizontally.

In this way, the raw material inlet chute 2c
The cement raw material 4 immediately after being charged can be preheated well with high heat exchange efficiency.

The cement raw material preheating apparatus of the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the scope of the present invention.

[0025]

According to the cement raw material preheating apparatus of the present invention described above, the following various excellent effects can be obtained.

(I) Since the cement raw material that has dropped from the raw material dropping chute can be evenly diffused and introduced into the connecting duct, the cement raw material can be remarkably excellent against the flow of the high temperature gas rising in the connecting duct. Can be put on,
Thereby, the heat exchange efficiency between the high temperature gas and the cement raw material can be significantly improved, and the cement raw material can be preheated well.

(II) If the cement raw material can be placed on the flow of the high temperature gas rising in the connecting duct extremely well, the flow velocity of the high temperature gas rising in the connecting duct can be made lower than in the prior art, so The power of the wind blower can be greatly reduced as compared with the conventional one, and thus the pressure loss of the entire cement raw material preheating device can be greatly reduced.

(III) If a diffusion disk for receiving the cement raw material that has fallen from the raw material inlet chute is also arranged at the connecting portion between the vertical portion of the uppermost connecting duct and the raw material inlet chute so that it can rotate substantially horizontally. Also, the cement raw material immediately after being charged from the raw material inlet chute can be preheated favorably with high heat exchange efficiency.

[Brief description of drawings]

FIG. 1 is a sectional view showing an example of an embodiment for carrying out the present invention.

FIG. 2 is a schematic diagram showing an example of a general cement manufacturing facility.

FIG. 3 is a partial detailed view of the cement raw material preheating device of FIG.

FIG. 4 is a view in the direction of arrows IV-IV in FIG. 3 showing a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Exhaust fan 2 Cyclone 2a Connection duct 2b Raw material dropping chute 2c Raw material inlet chute 3 Cement raw material preheating device 4 Cement raw material 5 Calcination furnace 9x high temperature gas 16 Cement baking furnace 20 Connection part 20 'connection part 23 Diffusion disk

Claims (2)

[Claims] 1. A plurality of cyclones arranged in a zigzag pattern in the vertical direction, and a connection that is connected to the side of the upper cyclone by rising upward from the center of the top of the lower cyclone and bending laterally in the middle. The duct, the material dropping chute that extends downward from the lower end of the upper cyclone and is connected to the vertical part of the lower connecting duct, the exhaust fan that is connected to the top center of the uppermost cyclone, and the uppermost cyclone. A cement raw material preheating device having a raw material inlet chute connected to the vertical portion of the connecting duct and configured to preheat the cement raw material by the high temperature gas introduced from the cement burning furnace for burning the cement raw material through the calcination furnace. In the connecting portion between the vertical portion of the connecting duct and the raw material dropping chute, a diffusion disk for receiving the cement raw material dropped from the raw material dropping chute is provided. A cement raw material preheating device, which is arranged so that it can rotate substantially horizontally. 2. The diffusion disc for receiving the cement raw material dropped from the raw material inlet chute is also arranged at the connecting portion between the vertical portion of the uppermost connecting duct and the raw material inlet chute so that it can be rotated substantially horizontally. The cement raw material preheating device according to claim 1, which is characterized in that.