JPS6348819B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a cooling device for cooling high-temperature powder such as high-temperature cement clinker fired in a kiln by air cooling.

Great coolers have traditionally been widely used as devices to cool high-temperature cement clinker.
As is well known, when cooling is performed using only a great cooler, drifting occurs and uneven cooling occurs, which deteriorates the cooling effect.

The present invention has a primary cooling section that rapidly cools the high-temperature powder and a secondary cooling section that slowly cools it, and the primary cooling section has a particle layer sliding mechanism using a gentle slope and the action of wind pressure. Therefore, it is an object of the present invention to provide a cooling device for high-temperature powder and granular material that can uniformly cool the material without the above-mentioned drift, and can improve the cooling efficiency.

For this reason, the configuration of the cooling device for high-temperature powder and granular material of the present invention includes a primary cooling section that rapidly cools the high-temperature powder and granular material by air cooling, and a primary cooling section that is provided below this primary cooling section to rapidly cool the high-temperature powder and granular material. The primary cooling section has a secondary cooling section that slowly cools the powder and granular material by air cooling, and the primary cooling section is provided at the inlet to temporarily retain the high-temperature powder and granular material. It has a vertical guide tube that restrains sudden expansion in the direction, and a large number of airflow passage holes that fluidize and flow down the high-temperature powder, and is arranged an appropriate distance below the lower end of the guide tube. a gently inclined cone whose apex is positioned on the central axis of the guide tube at an angle sufficiently smaller than the angle of repose of the high-temperature powder; a movement promoting tool that moves upward and downward in the vertical direction to promote movement of the powder and granules on the gently inclined cone toward the outside;
The movement promoting device includes a hollow conical head with a bottom, an outer cylinder part and an inner cylinder part which are integral with the head part, and a high pressure for vertical movement is applied between the outer cylinder part and the inner cylinder part. It is characterized by the formation of a chamber.

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

The drawing shows an embodiment of the present invention, in which cement clinker is used as the high-temperature powder.

In FIG. 1, 1 is a primary cooling section that rapidly cools cement clinker, which is a high-temperature powder, by air cooling, and 2 is a cement that is provided below this primary cooling section 1 and is rapidly cooled in the primary cooling section 1. A secondary cooling section 3 is a rotary kiln serving as a cement firing furnace, which gradually cools the clinker by air cooling.

The primary cooling section 1 has a vertical guide cylinder 4 provided at the inlet to temporarily retain the high-temperature cement clinker and restrain it from spreading rapidly in the lateral direction, and a large number of airflow passage holes. A conical or pyramidal shape is arranged below the lower end of the guide tube 4 by an appropriate distance, the top of which is located on the central axis of the guide tube 4, and has a gentle slope at an angle smaller than the angle of repose. A tilted cone 5, which is directed from the top of the gently tilted cone 5 into the guide tube 4 and moves up and down in the vertical direction to promote outward movement of the cement clinker on the gently tilted cone 5. and a movement facilitator 6,
Additionally, an air cooling device 7 is provided to hold the vertical guide tube 4 and further cool the outer periphery thereof.

The secondary cooling section 2 includes a packed bed cooler 8 that cools the rapidly cooled cement clinker as it moves from top to bottom while forming a filling moving bed.

In addition, 9 in Figure 1 is a control rod that controls the downward movement of the cement clinker, 10 is a scraper ring, 11 is a discharge scraper, 12 is a turntable, and 13 is a rod that carries the cooled cement clinker out of the system. 14 is a main air supply line for cooling the high temperature section (for the primary cooling section 1), 15 is its blower, 16 is for cooling the low temperature section (for the secondary cooling section 2)
17 is the blower, 18 is the air compressor, 19 is the switching valve, 20 is the air supply line for operating the movement facilitator, 21 is the air supply auxiliary line for cooling the high temperature part, 22 is the movement facilitator operation 23 is an on-off valve, and 24 is an air supply line for combustion in the calciner.

FIG. 2 shows the relationship between the vertical guide tube 4, the gently inclined cone 5, and the movement promoting device 6, as well as the details of the movement promoting device 6. That is, the movement promoting device 6 is of a piston type whose upper end is shaped like a porous cone, and is located above the fixing member 25 provided below the central axis 26 of the guide tube 4. It is movable. The movement promoting device 6 is
It consists of a bottomed hollow conical head 27 and an outer cylinder part 28 and an inner cylinder part 29 that are integrated with this, and a high pressure chamber 30 for vertical movement is provided between the outer cylinder part 28 and the inner cylinder part 29. It is formed. The fixing member 25 is composed of an inner tube part 31 and an outer tube part 32. The lower part of the inner tube part 29 is inserted into the inner tube part 31, and the lower part of the outer tube part 28 is airtightly externalized to the outside of the outer tube part 32. When inserted, the movement promoting tool 6 can be slid up and down with respect to the fixing member 25. The fixing member 25 also has an air inlet 33 connected to the air supply line 20 for operating the movement facilitator, an air inlet 34 connected to the air supply auxiliary line 21 for cooling high temperature parts, and an air exhaust for operating the movement facilitator. It has an air outlet 35 connected to the line 22.

In the cooling device for high-temperature powder and granular material configured as shown in the figure, approximately
Cement clinker 37 at a high temperature of 1350° C. is supplied into the vertical guide tube 4 as shown by the dotted arrow 38, and after temporarily staying in the guide tube 4, it reaches the gently inclined cone 5, and this cone The body 5 moves radially due to the inclination of the body 5, the effect of the wind pressure of the air blown up as shown by arrows 41 from a large number of airflow passage holes, and the effect of the vertical movement of the movement promoting device 6. Therefore, in the primary cooling section 1, since the cement clinker flows radially above the gently inclined cone 5, it is rapidly cooled uniformly to about 950° C. by the air indicated by the arrow 41. The cement clinker rapidly cooled in this way reaches the packed moving bed cooler 8 which is the secondary cooling section 2, where it is slowly cooled by air from the air supply line 16 for cooling the low temperature section. The cooled cement clinker is finally transported out of the system by the conveyor 13.

On the other hand, room temperature air from the main air supply line 14 for cooling the high temperature section flows in the directions of arrows 9, 40, 41, and 42, becomes high temperature air of about 1050° C., and is used as combustion air for the rotary kiln 3. Also, room temperature air from the low temperature section cooling air supply line 16 passes through the packed moving bed cooler 8, becomes high temperature air of about 800°C, and flows to the calciner combustion air supply line 24.

Furthermore, the compressed air from the air compressor 18 is switched by a switching valve 19 and flows into either the movement promoting device operating air supply line 20 or the high temperature part cooling air supply auxiliary line 21. That is, as shown in FIG. 2, the air supply auxiliary line 21 for cooling high temperature parts
When compressed air flows through the inner pipe section 3 from the air inlet 34
1 and the inner cylinder part 29 into the hollow part of the conical head 27, and is blown upward from there to stir the cement clinker in the vertical guide cylinder 4. Further, when compressed air is allowed to flow through the air supply line 20 for operating the movement promoting device, the on-off valve 23 is closed. Then, the compressed air from the line 20 enters the air inlet 3.
3, and further passes between the inner tube part 31 and the outer tube part 32 to reach the high pressure chamber 30 for vertical movement, where it becomes locked, so that the movement promoting device 6 rises with respect to the fixing member 25. . Conversely, when the supply of compressed air in the line 20 is stopped and the on-off valve 23 is opened, the compressed air in the high pressure chamber 30 is discharged from the movement promoting device operating air discharge line 22, and,
The movement promoting tool 6 descends with respect to the fixing member 25 due to its own weight. Therefore, the on-off valve 23 is closed to introduce compressed air from the line 20 into the high-pressure chamber 30, the compressed air in the line 20 is stopped, and the on-off valve 23 is opened to introduce compressed air from the high-pressure chamber 30. By discharging the compressed air, the movement promoting tool 6 can be moved up and down with respect to the fixing member 25. Here, in order to promote the movement of the cement clinker on the gently inclined cone 5, a slight vertical movement stroke is sufficient, so the stroke is between 27 and 27a. If a large lump arrives, please temporarily use code 27.
It is lowered to the position shown in b, and the large lump is dropped directly below without passing through the gently inclined cone 5, and is taken out from a take-out port (not shown) using a later cutter.

As described above, in the present invention, the cooling section that air-cools high-temperature powder and granules is composed of a primary cooling section that performs rapid cooling and a secondary cooling section that performs slow cooling. This makes it easy to perform cooling efficiently and without waste in terms of heat and time. especially,
The primary cooling section has a large number of airflow passage holes for fluidizing and flowing the high-temperature powder and granules, and is arranged at a distance from the lower end of the vertical guide cylinder so that the top part is centered at the center axis of the guide cylinder. a gently inclined cone positioned at an angle sufficiently smaller than the angle of repose of the high-temperature powder and granules; Since it is equipped with a movement promoting tool, the high-temperature powder and granular material on the gently inclined cone is
Due to its inclination, the fluidizing effect of the wind pressure of the air blown from the air flow passage hole, and the effect of the vertical movement of the movement promoting device, the movement is radial, and therefore there is no uneven cooling, and rapid cooling is performed uniformly and reliably. It will be done. Moreover, since the movement promoting tool has a conical head, the movement in the outward direction is reliably promoted, and the movement promoting tool has a hollow conical head with a bottom, and is integrated therewith. It consists of an outer cylindrical part and an inner cylindrical part, and a high pressure chamber for vertical movement is formed between the outer cylindrical part and the inner cylindrical part. In order to move the movable part of the movement promoting device, it is possible to easily move the moving part using compressed air or the like without requiring a complicated mechanical device.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention.
The figure is a partially cutaway front view, and FIG. 2 is an enlarged view of the main part. 1...Primary cooling section, 2...Secondary cooling section, 4...Vertical guide tube, 5...Gently inclined cone, 6...Movement promoting device, 8...Filled moving bed cooler, 27...Bottomed hollow conical head ,
28...Outer cylinder part, 29...Inner cylinder part, 30...High pressure chamber, 2
6...Central axis, 37...High temperature cement clinker.

Claims (1)

[Claims] 1. A primary cooling section that rapidly cools the high-temperature powder and granular material by air cooling, and a secondary cooling section that is provided below this primary cooling section and slowly cools the powder and granular material that has been rapidly cooled in the primary cooling section by air cooling. a cooling section, and the primary cooling section includes a vertical guide tube provided at an inlet section;
The guide tube has a large number of airflow passage holes, is disposed below the lower end of the guide tube, and has a top portion positioned on the central axis of the guide tube at an angle smaller than the angle of repose of the high temperature powder. a gently inclined cone; and a movement promoting tool that moves up and down in the vertical direction from the top of the gently inclined cone toward the inside of the guide cylinder, and the movement promoting tool has a bottomed hollow conical head. and an outer cylinder part and an inner cylinder part integrally formed therewith, and a high pressure chamber for vertical movement is formed between the outer cylinder part and the inner cylinder part, Cooling device for high temperature powder and granular materials.