JPH0451758B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION "Industrial Application Field" The present invention relates to a cement clinker cooling device, and in particular to a cooling device for cement clinker, which is used for cooling high-temperature cement clinker discharged from a cement clinker baking device, such as a rotary kiln. The present invention relates to a device for cooling.

``Prior Art'' Conventionally, in this type of cooling device, cement clinker transferred through the cooling device is separated into a predetermined particle size at the discharge end, and lump clinker larger than the predetermined particle size is separated into a predetermined particle size there. It is known that the material is crushed and then circulated to a cooling section provided upstream of the separation and crushing device in the transport direction, where it is cooled again. Such a cooling device is typically disclosed in the applicant's earlier application, Utility Model Application No.
It is disclosed in Publication No. 193832.

For example, typical examples of such cooling devices are shown in FIGS. 2 and 3. In FIG. 2, a cement clinker cooling device 4 (hereinafter referred to as a cooling device) is disposed downstream of a rotary kiln 1 that constitutes a part of a cement clinker firing device (not shown). Clinker, which has been fired at a high temperature in the rotary kiln 1 via the burner 3, is supplied to the cooling device 4 through the firing port cover 2.

Such a cooling device 4 comprises a ventilation grid 5, for example a vibrating grid or a moving grid. On the permeable grid 5, the clinker 6 deposited in a layered manner is transferred in a substantially horizontal direction toward the discharge end 20, and during the transfer process, the clinker 6 is removed from the forced air blower 7. Breathable grid 5
Cooling air sent into a wind box 8 provided below is cooled by flowing through the layered clinker 6 in a high temperature state orthogonally from below.

Adjacent to the discharge end 20 of the cooling device 4 are, for example, a Grizz River type separator 14 and an impact crusher 15 for separating fine clinker and crushing the remaining lumpy clinker. It is provided. The upper chamber 20a of the separation device 14 and the upper chamber 21 of the crusher 15 are separated by a chain 19 suspended from above. Corresponding to the upper chambers 20a and 21, a chute 10 for discharging appropriately treated clinker is located below the clinker separator 14 and the crusher 15.
a and 10b are arranged.

On the other hand, a return port 18 for the clinker crushed by the crusher 15 is provided on the ceiling surface of the cooling device 4, and a chute 18a communicating with the lower chute 10b of the crusher 15 and the return port 18 is provided. for,
Various conveying devices 17a, 17b, and 17c for circulating and supplying crushed clinker are continuously arranged.

Therefore, the lump clinker fed into the grizzly separator 14 from the discharge end 20 of the cooling device 4 slides down on this grizzly bar under its own weight, displacing the hanging chain 19 and passing through the crusher 15.
and is crushed by this crusher 15 to a predetermined particle size or less.

At this time, due to the strong impact force at the time of crushing, a part of the crushed clinker is bounced back towards the cooling part side of the cooling device 4, but such clinker hits the chain 19 mentioned above. It is designed to fall and be stopped there. On the other hand, most of the clinker crushed to a predetermined particle size or less is discharged from the chute 10b disposed below the crusher 15.

Subsequently, the clinker crushed in this way is transported by each transport device 17a, 17b, 17c,
The air is returned from the return port 18 onto the ventilation grid 5 of the cooling device 4 and cooled again. This is because the inside of the lumpy clinker is not sufficiently cooled even at the discharge end 20 of the cooling device 4 and is still in a red-hot state, so it is separated and crushed to expose the hot inside and cooled. This is to circulate to the cooling section of the device 4 and cool it again. On the other hand, the clinker (product clinker) having a predetermined particle size or less separated by the separator 14 is supplied from the chute 10a to the conveyor 11 and carried out to the next process.

In addition, during the transfer process on the ventilation grid 5 of the cooling device 4, clinker falling from the ventilation grid 5 into the wind box 8 is collected by a conveyor 11a arranged below the wind box 8, and separated. Device 1
4 and is combined with the product clinker discharged from the chute 10a on the conveyor 11.

Next, another conventional cooling device 4' in FIG.
In this example, a roll feeder 14a is used as a separating device. Such a roll feeder 14a
Now, the clinker lumps are forcibly transferred to the crusher 1.
Since a mechanism for feeding the chains 19' to the 5 side is adopted, the chains 19' are easily pushed away, and are arranged in many layers compared to the case of the chains 19 in FIG. 2 described above. Therefore, it is designed to more reliably prevent clinker whose red-hot fractured surface is exposed during crushing (hereinafter referred to as red-hot clinker) from being mixed into the product clinker.

``Problems with the conventional technology'' However, such conventional cooling devices 4, 4'
In case of
There is a considerable amount of clinker passing through the gap 9' and entering the cooling section, and the chains 19, 19', which are simply hung like a curtain, are not able to block out the red-hot clinker that is strongly bounced back. , there were certain limits. Therefore, the hot red-hot clinker mixed into the product clinker increases the average temperature of the product clinker, leading to an increase in the cement product temperature in the subsequent crushing process, etc., and at the same time reducing the crushing capacity of the crushing equipment or the cement. This had a negative impact on the quality of the product.

Further, large lump clinker that is separated by the separators 14 and 14a and supplied to the crusher 15 is often temporarily generated in large quantities when the operating condition of the rotary kiln 1 becomes unstable. The lump clinker discharged from the rotary kiln 1 is continuously supplied to the crusher 15 with only a time delay while passing through the cooling device 4. Since the crusher 15 instantaneously crushes these clinker blocks by impact force,
A large amount of crushed red-hot clinker is also temporarily discharged from the lower chute 10b of the crusher 15, and therefore the following circulating conveyance devices 17a, 1
For 7b and 17c, it was necessary to select relatively large equipment with sufficient capacity.

Furthermore, separate separation devices 14, 14a are provided.
Depending on the arrangement of the impact type crusher 15, there were problems both in terms of installation space and in terms of making the device more compact.

``Object of the Invention'' Therefore, the main object of the present invention is to provide a cooling device for cement clinker that can prevent the red-hot clinker after crushing from being mixed into the product clinker and obtain a low-temperature product clinker. It is to provide.

Another object of the present invention is to provide a cooling device for cement clinker in which the size of a circulating conveyance device for crushed clinker is reduced, and at the same time, a separation device and a crusher are substantially integrated, thereby making the separation and crushing device more compact.

"Means for Solving the Problems" In order to achieve the above object, the main means adopted by the present invention is to cool the high-temperature cement clinker disposed subsequent to the kiln and discharged from the kiln. A cooling device, which separates and crushes clinker lumps out of the clinker discharged from the cooling device near the discharge end of the cooling device, and cools the crushed clinker again through a suitable circulating conveyance means. In a cooling device for cement clinker that is circulated and supplied to the cooling device, at least three rotating rolls are arranged at appropriate intervals in the vicinity of the discharge end of the cooling device in a direction perpendicular to the direction in which the clinker is transported. A plurality of rotating rolls arranged in parallel and located on the upstream side with respect to the transfer direction are used as normal rotation rolls and are rotated in the normal direction according to the same transfer direction, and a plurality of rotating rolls located on the upstream side with respect to the transfer direction An appropriate number of rotating rolls located in the above are used as reverse rotation rolls to rotate in the opposite direction in the same transport direction, and to carry out the fine clinker separated between the normal rotation rolls below the normal rotation rolls. A forward-rotating roll placed in front of the reversing roll adjacent to the transporting direction also has the function of separating and crushing clinker, and below the forward-rotating roll and the reversing roll, this forward-rotating roll is provided. The point is that the above-mentioned circulating conveyance means for clinker compressed and crushed between reversing rolls is provided.

"Function" When the interval between the plurality of normally rotating rollers arranged on the upstream side with respect to the clinker transport direction on the air permeable grid of the cooling device is set to the interval for a roll feeder, for example, these selected The plurality of normally rotating rolls form a clinker separator, the fine clinker falls through the gap between the rolls, and only the clinker lumps are transferred on the rolls.

On the other hand, in the same transfer direction, the most downstream normal rotation roll,
Further, if the distance between the reversing rolls disposed on the downstream side is set to, for example, the interval for a roll crusher, and these adjacent forward and reversing rolls are provided to rotate facing each other, these selected The forward and reverse rotating rolls form a compression type crusher for clinker blocks. The compression type crusher crushes the clinker lumps separated in the roll feeder section into a predetermined particle size without splashing them toward the cooling section.

"Effects of the Invention" According to the present invention, clinker blocks are compressed and crushed by forward and reverse rotation rolls, so that the red-hot clinker after crushing can be reliably discharged to the circulation conveyance device, and the clinker in the finished product can be reliably discharged. It is possible to prevent red-hot clinker from being directly mixed into the water. Therefore, the clinker product can be maintained at a sufficiently low temperature.

In addition, the crushing mechanism in the roll crusher section is performed by gradually biting the clinker chunks between a pair of rolls that rotate in forward and reverse directions. stored over time. Therefore, even if a large amount of lump clinker is intensively supplied to the crushing section, a large amount of crushed red-hot clinker will not be temporarily discharged from the crusher, and other types of crushers may be used. Compared to the conventional case, the subsequent circulating conveyance device can be equipped with a small capacity.

Furthermore, it is possible to effectively integrate the separator and the crusher, and the clinker shielding member provided between the two is no longer necessary, so that the apparatus can be made more compact.

The above objects, other objects, features and advantages of the present invention will become more apparent from the following detailed description of embodiments with reference to the drawings.

Embodiment FIG. 1 is a schematic vertical sectional view of a cement clinker cooling device showing an embodiment of the present invention. It should be noted that the embodiment is only one specific example of the present invention, and the technical scope of the present invention is not limited by this embodiment. Further, the same reference numerals will be used to describe the same elements as those of the conventional cement clinker cooling device shown in FIGS. 2 and 3.

Furthermore, in the embodiment device described below, the conventional cooling device described above is used for most of its parts, so for the sake of convenience and to avoid duplication, a description of these points will be omitted. Therefore, the parts that are particularly different from the conventional example will be explained below.

In FIG. 1, the cooling device 4'' has a discharge end 2
Three normally rotating rolls 30a, 3 arranged in order in the direction perpendicular to the transport direction of the clinker 6 in the vicinity of 0
0b, 30c, and one reversing roll 30d. These four forward and reverse rotation rolls 3
0a to 30d are rotatably arranged substantially parallel to each other at appropriate intervals. Among them, the three normal rotating rolls 30a to 30c located on the upstream side in the clinker transport direction are set at a spacing that is large enough to separate the clinker discharged from the cooling section into a predetermined particle size. , are both rotated in a direction perpendicular to the transport direction. Normal rotation roll 30a selected in this way
30c is provided as a roll feeder for clinker blocks.

Further, a reverse rotation roll 30d located at the downstream end with respect to the transfer direction, and a normal rotation roll 30 located adjacent to the reverse rotation roll 30d in front of the transfer direction.
The distance between the clinker and the clinker is set to be large enough to crush the clinker to a predetermined particle size or less. However, the rotation direction of the reversing roll 30d is
The rotation direction of the normal rotation roll 30c is set to be opposite to the rotation direction of the normal rotation roll 30c (the direction opposite to the direction of transporting the lump clinker), and the reverse rotation roll 30d is set to the rotation direction of the normal rotation roll 30c.
In cooperation with this, clinker blocks are sandwiched between them and compressed and crushed. Therefore, the most downstream normal rotation roll 30c and reverse rotation roll 30d are provided as, so to speak, a roll crusher for the lumpy clinker.

In this embodiment, a case has been described in which four rotating rolls are used. However, in order for this invention to be applied, it is sufficient to have at least three rotating rolls, and there is no limitation on the number of rotating rolls if the number is increased beyond that.

For example, in the case of three rotating rolls, two normal rotating rolls are placed upstream with respect to the direction of transport of clinker blocks, rotated in the forward direction with respect to the direction of transport of block clinker, and the two normal rolls are placed on the upstream side with respect to the direction of transport of block clinker. Place one reversal roll.

Furthermore, six rotating rolls are arranged as a separation and crushing device, and the first to third and fifth rolls from the upstream side as viewed in the transport direction always rotate in the forward direction, and the fourth roll switches its rotation between forward and reverse. Furthermore, by making the 6th roll at the most downstream always rotate in the opposite direction, the 3rd normal rotation roll and the 4th reverse rotation roll constitute the first crushing section, and the 5th normal rotation roll and the sixth reversing roll can constitute a second crushing section.

During operation, when a large amount of clinker is stored on the rolls of the first crushing section, the rotation of the switchable fourth roll is temporarily switched in the forward direction to maintain the storage state. By sending the clinker blocks in the second crushing section to the second crushing section and then switching the rotation of the fourth roll again in the opposite direction, both crushing sections can function at the same time.

As shown in FIG. 1, on the upstream side in the conveyance direction of the clinker lumps, at the bottom of each normal rotation roll 30a to 30c that separates the lump clinker, there is a fine grain side separated via a chute 10a. A conveyor 11 is provided for transporting the product clinker. In addition, a reversing roll 30d for compressing and crushing clinker lumps and a normal rotating roll 30c placed in front of the roll 30d in the clinker transporting direction are provided with a circulating conveyance system for appropriately circulating the crushed red-hot clinker. A device 17a is provided.
The size or position of the chutes 10a and 10b is changed as appropriate depending on the number of rotating rolls and the set number of crushing parts.

Next, with reference to FIG. 1, the functions of the cooling device having such a configuration will be explained. When the clinker that has been cooled by the cooling device 4'' and conveyed to the discharge end 20 side is fed onto the normal rotation rolls 30a to 30c, clinker having a particle size below a predetermined size is separated on the normal rotation rolls. , collected in a chute 10a and discharged to a conveyor 11 as product clinker.

On the other hand, clinker particles having a predetermined particle size or more are sequentially sent to the normal rotation rolls 30a to 30c, and the most downstream normal rotation roll 30c and the reverse rotation roll 30d in the transport direction.
It is sent to the crushing section, which consists of here,
The clinker block is compressed and crushed in cooperation with the forward and reverse rotation rolls 30c and 30d. Then, the crushed clinker blocks are collected in the chute 10b and discharged to the circulation conveyance device 17a. Note that the function of the circulation conveyance device into which the crushed red-hot clinker is introduced is the same as that described for the conventional device, so the description thereof will be omitted here.

In a preferred embodiment, claw-like protrusions are provided on the outer circumferential surface of each rotary roll provided in the portion for crushing the clinker blocks, so that the clinker blocks sent therein can be reliably and firmly bitten.
This allows the clinker blocks to be compressed and crushed more effectively.

Furthermore, the present invention can be easily applied to existing cooling devices.

[Brief explanation of drawings]

FIG. 1 is a schematic vertical cross-sectional view of a cement clinker cooling device according to an embodiment of the present invention, and FIGS. 2 and 3 are schematic vertical cross-sectional views showing a conventional cement clinker cooling device that is the background of this invention. It is. (Explanation of symbols), 1...Rotary kiln, 2
...Firing mouth cover, 4,4',4''...Cooling device, 5...
...Breathable grid, 6...Clinker, 8...Wind box, 1
7a to 17c... Circulating conveyance device, 20... Discharge end, 30a to 30c... Normal rotation roll, 30d...
Reverse roll.

Claims (1)

[Scope of Claims] 1. A cooling device that is disposed subsequent to a kiln and cools high-temperature cement clinker discharged from the kiln, which cools lump clinker among the clinker discharged from the cooling device. In a cooling device for cement clinker, the clinker is separated and crushed near the discharge end of the cooling device, and the crushed clinker is circulated and supplied again to the cooling section side via an appropriate circulating conveyance means, the discharge of the cooling device. Near the end, at least three rotating rolls are arranged substantially parallel to each other at appropriate intervals in a direction perpendicular to the direction of transport of the clinker, and among these, a plurality of rotating rolls are arranged on the upstream side with respect to the direction of transport of the clinker. The rotation roll of the book is used as a normal rotation roll and is rotated in the same direction in the same direction, and the appropriate number of rotation rolls located on the downstream side with respect to the transfer direction are used as reverse rotation rolls and rotated in the same direction. At the same time, discharging means is provided below the rotating rolls for carrying out the fine clinker separated between the normal rotating rolls, and a normal rotating roll adjacent to the reversing rolls and disposed in front of the rotating rolls in the transport direction. The rotary roll also has the function of separating and crushing clinker, and the above-mentioned circulating conveyance means for the clinker crushed by pressure between the forward and reverse rotation rolls is provided below the forward and reverse rotation rolls. Cement clinker cooling system. 2. The cement clinker according to claim 1, wherein only one rotating roll disposed at the downstream end is configured as a reversing roll and is rotated in a reverse direction opposite to the direction of transport of the clinker. Cooling system.