JPS6348820B2 - - 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, in cooling using only a great cooler, drifting occurs and uneven cooling occurs, deteriorating the cooling effect.

The present invention divides a cooling section for cooling high-temperature powder into a primary cooling section and a secondary cooling section, and performs rapid cooling in the primary cooling section and gradual cooling in the secondary cooling section. Provides a cooling device for high-temperature powder and granular materials that can improve cooling efficiency by using a packed layer type cooler for the cooling section, which eliminates the aforementioned uneven cooling and can uniformly cool the material. The purpose is to

For this reason, the configuration of the present invention includes a primary cooling section that rapidly cools high-temperature powder and granular material by air cooling, and a primary cooling section that is provided below this primary cooling section to air cool the powder and granular material that has been rapidly cooled in the primary cooling section. The primary cooling section has a vertical guide tube provided at the inlet and a number of air flow passage holes at the lower end of the guide tube. a gently inclined cone which is disposed at a lower position and whose apex is positioned on the central axis of the guide cylinder at an angle smaller than the angle of repose of the high temperature powder and granules, and the top of this gently inclined cone; a movement accelerator that moves up and down in the vertical direction while pointing into the guide cylinder; It is characterized by comprising a layered cooler and a plurality of control rods provided in the cooler to control the moving speed of the granular material.

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 slowly 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 cone or a cone, which is disposed an appropriate distance below the lower end of the guide tube 4, with its top positioned on the central axis of the guide tube 4, and has a gentle slope at an angle smaller than the angle of repose of the cement clinker. A pyramid-shaped gently inclined cone 5 is formed, and the cement clinker on the gently inclined cone 5 is moved upward and downward in the vertical direction from the top of the gently inclined cone 5 toward the inside of the guide tube 4. An air cooling device 7 is provided which includes a movement promoting tool 6 for promoting movement, holds the vertical guide cylinder 4, and further cools the outer periphery of the vertical guide cylinder 4.

The secondary cooling section 2 is composed of a packed layer cooler 8 having an annular cross section that cools the clinker moving from top to bottom while forming a moving layer filled with rapidly cooled cement clinker.

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 made up 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 placed outside the outer tube part 32. The movement facilitator 6 is fitted over the fixing member 25 so that it can be slid up and down relative 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. Air outlet 35 connected to line 22
It has In addition, the secondary cooling section 2 does not use the central section as a cooler, but uses an annular cross-sectional area on the outer circumference side, and furthermore, the cooled cement is cooled from the lower part of the outer circumference side of the secondary cooling section 2. It is designed to discharge clinker. By doing so, the cement clinker in the secondary cooling section 2 flows down more uniformly than in a known cooler that uses the central part as a cooler, and the occurrence of uneven flow can be avoided. .

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. Since the annular horizontal cross-sectional area holding the cement clinker in the secondary cooling section 2 is wide, the discharge scraper 11 and the turntable 1
2, cement clinker is continuously discharged from the lower outer periphery of the secondary cooling section 2, but there is a difference in the flow rate, and there are parts where heat exchange is insufficient and high temperature cement clinker flows down. . Here, by inserting a plurality of control rods 9 for controlling the flow rate into the layer in the horizontal direction from the outer peripheral wall surface and in the vertical direction from the inner peripheral inclined wall surface, the cement clinker having a high flow rate can be The flow rate can be adjusted. Thereby, the cement clinker, which is the granular material to be cooled, can be uniformly cooled.

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 39, 40, 41, and 42, becomes high temperature air of approximately 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 then 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 blocked, so that the movement promoting device 6 rises with respect to the fixing member 25. . Conversely, the line 20
When the supply of compressed air 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 operation air exhaust line 22, and the movement promoting device 6 is moved by its own weight. It descends relative to the fixed member 25. 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. When a large lump arrives, it is temporarily lowered to the position shown by the symbol 27b, and the large lump is allowed to fall directly below without passing through the gently inclined cone 5.
Look at the cutting machine and take it out from the take-out port (not shown).

As described above, in the present invention, the cooling section that air-cools high-temperature powder and granules consists of a primary cooling section that performs rapid cooling and a secondary cooling section that performs slow cooling. This makes it possible to perform efficient cooling without wasting heat or time. Moreover,
The primary cooling section is provided with a vertical guide tube at the inlet, and a gently inclined cone having a large number of air flow passage holes is provided below the guide tube, and the guide tube is connected from the top of the gently inclined cone to the guide tube. Since the guide tube is provided with a movement promoting tool that moves up and down in the vertical direction, the guide tube temporarily retains the high-temperature powder and granules, and
After restraining rapid spread in the lateral direction, the high-temperature powder and granules are moved on the gently inclined cone by the fluidization effect of the inclination, the wind pressure of the air blown up from the air flow passage hole, and the movement promoting device. Due to the vertical movement of the liquid, it flows radially and achieves stable rapid cooling. In particular, the secondary cooling section is equipped with a packed moving bed cooler, so even if uneven cooling occurs in the primary cooling section, the secondary cooling section gradually cools it down to uniform cooling. By supplying powder and granules to the packed layer type cooler in the next cooling section from the upper surface of the entire circumference of the annular section of the cooler, it is possible to reduce the difference in the layer thickness of the packed layer, and the cooled powder and granules are is discharged from the entire circumference of the lower part of the cooler, and the powder and granules flow down without becoming partially stagnant in the cooler, and a control rod installed in the cooler allows the powder and granules to be discharged from the entire circumference of the lower part of the cooler. Since the downward movement speed is controlled to be uniform, the homogeneity of the product can be improved.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention.
The figure is a partially cutaway front view, and FIG. 2 is a partially enlarged view of FIG. 1. 1... Primary cooling section, 2... Secondary cooling section, 4... Vertical guide tube, 5... Gently inclined cone, 8... Filled layer cooler,
9...Control rod.

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 the 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 granular material. a gently inclined cone; and a movement promoting tool that moves up and down in the vertical direction pointing into the guide cylinder from the top of the gently inclined cone; It is characterized by comprising a packed bed type cooler having an annular cross section and cooling the powder and granular material, and a plurality of control rods provided in the cooler to control the moving speed of the powder and granular material. A cooling device for high-temperature powder and granular materials.