JPH07172884A - Cement clinker cooling device - Google Patents

Abstract

PURPOSE:To improve the cement clinker cooling efficiency and to improve the heat recovery efficiency of cooling air by providing a cement clinker cooler capable of efficiently exchanging heat between the clinker and cooling air. CONSTITUTION:A cement clinker 3 introduced from a kiln 1 is separated into the coarse grain, medium grain and fine grain by the slits of the grid plates 18a, 18b, 19a and 19b in the upper and lower conveyor-type cooling mechanisms 16 and 17, and the coarse-grain and medium-grain clinker 3 regulated in size and having a relatively high heat capacity are cooled. Meanwhile, heat is exchanged between the cooling air 7 ascending from below the cooling mechanism 16 and passing through the cooling mechanisms 16 and 17 and the clinker 3, and the combustion air 7' with the temp. higher than before is obtained.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cement clinker cooling device.

[0002]

2. Description of the Related Art FIGS. 5 and 6 show an example of a conventional cement clinker cooling device generally called a great cooler, in which 1 is a rotating cylindrical kiln having a downstream end 2 Of the cement clinker 3 descends in the kiln 1 according to the inclination. A burner 4 is provided on the end 2 side of the kiln 1 so as to send a heating gas into the kiln 1 and burn the cement clinker 3 descending inside the kiln 1. The fired cement clinker 3 falls into the cooling device 5 provided below the end 2 of the kiln 1 to be cooled.

A transfer type cooling mechanism 8 is provided inside the cooling device 5 so that the cement clinker 3 dropped from the end 2 of the kiln 1 can be cooled by cooling air 7 while moving to the outlet 6. ing.

That is, the transfer type cooling mechanism 8 is provided in the kiln 1.
5 is provided with a large number of fixed grid plates 9a and movable grid plates 9b which are alternately arranged in succession from the position below the end 2 toward the left in FIGS. The lattice plate 9b is attached to a movable frame 11 that reciprocates in the direction of the arrow by a driving device 10, and the movable frame 1
By the reciprocating movement of 1, the cement clinker 3 on each grid plate 9a, 9b is sequentially sent out to the left.

Further, each lattice plate 9a, 9b has a large number of slits (not shown) on its surface, and the cooling air 7 sent to the lower side of each lattice plate 9a, 9b by the cooling fan 12 is aforesaid. It is designed to pass through the slit and be ejected upward.

Reference numeral 13 in the drawing is an air for guiding a part of the cooling air 7 which has become high temperature by exchanging heat with the cement clinker 3 to a calcining furnace (not shown) upstream of the kiln 1 as combustion air 7 '. A lead-out pipe, 14 is a carrying conveyor for carrying the cement clinker 3 discharged from the outlet 6.

The cement clinker 3 which has been burned in the kiln 1 and dropped from the end 2 into the cooling device 5 is shown in FIG.
And reaches the right end of the transport cooling mechanism 8 in FIG.
The cement clinker 3 cooled at the left end of the cooling device 5 is cooled by the cooling air 7 ejected from the slits of the lattice plates 9a and 9b while being sequentially moved to the left by the reciprocating movement of the movable lattice plate 9b. It is taken out from 6. On the other hand, a part of the cooling air 7 ejected from the slits of the lattice plates 9a and 9b to cool the cement clinker 3 is part of the combustion air 7'of the burner 4 or a calcination furnace (not shown).
Is used as combustion air 7 ', and the rest is discharged to the outside.

[0008]

However, in the conventional cooling device 5 as described above, the cement clinker 3 is laid in a planar thin layer with the large clinker 3 ', which is difficult to cool, mixed to cool it. Therefore, the heat exchange efficiency between the cement clinker 3 and the cooling air 7 is low, and the cooling efficiency is poor when viewed from the cement clinker 3 side.
From the side, there was a problem of poor heat recovery efficiency.

The present invention has been made in view of the above circumstances, and improves the cooling efficiency of a cement clinker by providing a cement clinker cooling device capable of efficiently exchanging heat between the cement clinker and cooling air. In addition, the purpose is to improve the heat recovery efficiency of the cooling air.

[0010]

SUMMARY OF THE INVENTION The present invention comprises a fixed grid plate and a movable grid plate, which are alternately arranged so that the ends of the kiln are sequentially stacked from a position below the end of the kiln toward the outlet. The transport type cooling mechanism configured to cool the cement clinker falling from the end of the movable clincher plate by the reciprocating movement of the movable lattice plate to the outlet while being cooled by the cooling air ejected from the slits of each lattice plate Arranged,
The cement plate clinker cooling device, characterized in that the slits of the lattice plate in the transport type cooling mechanism of each stage are formed in a size capable of selecting cement clinker of a small size stepwise from the upper stage side to the lower stage side, And a packed bed cooler capable of filling the cement clinker dropped from the slits of the lattice plate in the carrying type cooling mechanism and introducing cooling air into the lower part of the lowermost carrying type cooling mechanism. A cooling device for the cement clinker, and a slidable plate having a slit having a size capable of dropping the cement clinker of a predetermined size or less is disposed between the end of the kiln and the uppermost transport type cooling mechanism. Then, an air chamber capable of introducing cooling air is formed in the lower part of the slide plate, and a breaker is arranged near the lower end of the slide plate. Mosquito cooling device, it relates to a.

[0011]

The cement clinker guided from the kiln is sorted into coarse particles, medium particles, fine particles, etc. by the slits of the lattice plate in the transport cooling mechanism of each stage, and the coarse particles having a relatively large heat capacity. A medium-sized cement clinker is cooled with the particles being aligned.

On the other hand, since the cooling air rising from the lower part of the lower transfer type cooling mechanism is given a chance to exchange heat with the cement clinker every time it passes through the upper transfer type cooling mechanism, it is used for combustion at a higher temperature than before. Air is obtained.

According to the cement clinker cooling device of the second aspect, the fine-grained cement clinker that drops from the lowermost transport type cooling mechanism is separated from the coarse-grained / medium-grained cement clinker that is hard to cool and is filled. Since it is filled in the layer cooler and efficiently cooled by the cooling air, the cooling efficiency of the cement clinker and the heat recovery efficiency of the cooling air are further improved.

In the cement clinker cooling device according to the third aspect of the invention, the cement clinker from the kiln is cooled before it falls on the uppermost transport type cooling mechanism, and the large clinker in the cement clinker is cooled. Is crushed by a breaker and made into small pieces, and then guided to the uppermost transport cooling mechanism, so that the cooling efficiency of the cement clinker and the heat recovery efficiency of cooling air are further improved.

[0015]

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

1 to 4 show an embodiment of the cooling device for a cement clinker of the present invention, and the parts designated by the same reference numerals as those in FIGS. 5 and 6 represent the same parts.

Reference numeral 15 in the drawing denotes a cooling device provided on the downstream side of the kiln 1, and inside the cooling device 15 is the same as the transfer type cooling mechanism 8 of the cooling device 5 of FIGS. 5 and 6 described above. The configured transport cooling mechanisms 16 and 17 are provided in two upper and lower stages.

2 and 3 show the upper conveyance type cooling mechanism 1.
6, the grid plates 18a, 18b (fixed grid plate 18
a, the movable grid plate 18b), and the lower transport type cooling mechanism 17
Of the lattice plates 19a and 19b (fixed lattice plate 19a,
Movable grid plates 19b) are shown respectively, and as shown in the figure, the slits 21 of the grid plates 19a and 19b of the lower transfer type cooling mechanism 17 are the grid plates 18a and 1 of the upper transfer type cooling mechanism 16.
It is formed smaller than the slit 20 of 8b, and the cement clinker 3 is coarser / medium /
It is designed to be finely divided.

At the upper part of the upper transfer type cooling mechanism 16, a coarse grain chamber 22 communicating from the end 2 of the kiln 1 to the outlet 6 is provided.
In the lower part of the upper transfer-type cooling mechanism 16, the partition plate 23 and the casing of the cooling device 15 divide the cement clinker 3 into three parts in the transfer direction (the left-right direction in FIG. 1). A grain chamber 24 is formed.

Further, a fine grain chamber 26 divided into three by the partition plate and the casing of the cooling device 15 corresponding to the medium grain chamber 24 is formed in the lower part of the lower transfer type cooling mechanism 17, The cooling air 7 from the cooling fan 29 can be introduced into each of the medium grain chambers 24 and each of the fine grain chambers 26 via the cold air blowing ducts 27 and 28 connected to the respective side walls.

The lower part of each of the fine grain chambers 26 is a packed bed cooler 32 which is formed in a hopper shape so that the cooling air 7 from the cooling fan 30 can be introduced into the inside through the cold air blowing port 31. Configured, each packed bed cooler 32
The lower end of is connected to a conveyor 36 via seal dampers 33, 34 and 35.

Further, a slide plate 38 having a slit 37 having a size capable of dropping the cement clinker 3 having a predetermined size or less is inclined between the end portion 2 of the kiln 1 and the upper conveyance type cooling mechanism 16. The slide plate 38
An air chamber 40 is formed at the lower part of the partition 39 by the partition plate 39 and the casing of the cooling device 15, and the air chamber 40 also has a cold air blowing duct 41 like the medium grain chamber 24 and the fine grain chamber 26. Cooling air 7 from the cooling fan 29 connected
Is introduced.

At the position near the lower end of the slide plate 38, the slide plate 3 does not fall from the slit 37 of the slide plate 38.
A breaker 42 for crushing the large clinker 3 ′ that has slid off the upper surface of 8 into small lumps is provided.

The breaker 42 is composed of a rotating portion 43 connected to a rotation driving device (not shown), and a hammer portion 44 pivotally attached to a plurality of circumferential positions of the rotating portion 43 (four locations in the illustrated example). (See FIG. 4).

In the figure, reference numeral 45 is a breaker having the same construction as the breaker 42 and provided near the downstream end of the upper transfer-type cooling mechanism 16, and 46 is a seal damper provided below the outlet 6. Indicates.

The cement clinker 3 fired in the kiln 1 is cooled by the cooling air 7 which is dropped from the end 2 onto the slide plate 38 and blown out from the slit 37.

At this time, the cement clinker 3 of a predetermined size or less, excluding the large clinker 3 ', passes through the slit 37 of the slide plate 38 and drops onto the upper conveyance type cooling mechanism 16, and the slit 37 of the slide plate 38. The larger lump clinker 3 ′ slides on the upper surface of the slide plate 38 and is broken into small pieces by the breaker 42, and then drops onto the upper conveyance-type cooling mechanism 16.

The cement clinker 3 dropped on the upper transfer type cooling mechanism 16 is moved toward the outlet 6 by the reciprocating movement of the movable lattice plate 18b, and each lattice plate 18a, 1 is moved.
It is cooled by the cooling air 7 blown from the slit 20 of 8b.

At this time, the cement clinker 3 having a size smaller than the slit 20 of each of the lattice plates 18a and 18b,
That is, the cement clinker 3 having a medium grain size or less has the slit 20
To the lower transport type cooling mechanism 17, and the cement clinker 3 having a size larger than the slit 20, that is, the coarse-grained cement clinker 3 is directly transported by the upper transport type cooling mechanism 16 and dropped from the downstream end. Then, it is crushed by the breaker 45 and discharged from the outlet 6.

Further, the cement clinker 3 of medium particles or less dropped on the lower transfer type cooling mechanism 17 has the movable grid plate 19 similarly to the case of the upper transfer type cooling mechanism 16 described above.
It is cooled by the cooling air 7 blown out from the slits 21 of the lattice plates 19a and 19b while being moved toward the outlet 6 by the reciprocating movement of b.

At this time, the cement clinker 3 having a size smaller than the slit 21 of each of the lattice plates 19a and 19b,
That is, the fine-grained cement clinker 3 drops from the slit 21 into the fine-grained chamber 26, and the cement clinker 3 having a size larger than the slit 21, that is, the medium-sized cement clinker 3 is directly conveyed by the lower conveyance type cooling mechanism 17. It is then discharged from the outlet 6.

Further, the fine-grained cement clinker 3 dropped into the fine-grained chamber 26 is filled in a packed bed cooler 32 formed in the lower part and cooled by cooling air 7 introduced into the inside through a cold air blowing port 31. And the seal dampers 33, 34,
It is cut out from 35.

The air chamber 40, the medium grain chamber 24, and the fine grain chamber 26
The cooling air 7 respectively supplied to the packed bed cooler 32 becomes high temperature combustion air 7 ′ by exchanging heat with the cement clinker 3 and rises to reach the coarse particle chamber 22 and the kiln 1 or not shown. Guided to the calciner.

Therefore, according to the above-mentioned embodiment, the cement clinker 3 guided from the kiln 1 is sorted into coarse particles, medium particles and fine particles by the upper and lower two-stage conveying type cooling mechanisms 16 and 17, and has a relatively high heat capacity. Since the large and medium-sized cement clinker 3 can be cooled with the particles aligned, the cooling efficiency of the cement clinker 3 can be greatly improved compared to the conventional one, and compared with the conventional great cooler etc. As a result, the overall equipment can be reduced.

Further, since the cooling air 7 rising from the fine grain chamber 26 is given a chance of heat exchange with the cement clinker 3 every time it passes through the lower and upper transfer type cooling mechanisms 17 and 16, combustion at a higher temperature than in the conventional case is performed. Air for use 7'can be obtained, and heat recovery efficiency can be improved.

Further, since the packed bed cooler 32 is formed in the lower portion of each fine grain chamber 26, the lower transport type cooling mechanism 1 is provided.
Since the fine-grained cement clinker 3 falling from 7 is separated from the hard-to-cool coarse / medium-grained cement clinker 3 into a filled state and can be efficiently cooled by the cooling air 7, the cooling efficiency of the cement clinker 3 is improved. Also, the heat recovery efficiency of the cooling air 7 can be further improved.

Further, a sliding plate 38 having a slit 37 having a size capable of dropping the cement clinker 3 having a predetermined size or less is disposed between the end portion 2 of the kiln 1 and the upper conveyance type cooling mechanism 16 in an inclined manner. And an air chamber 40 into which the cooling air 7 can be introduced is formed below the slide plate 38.
By disposing the breaker 42 in the vicinity of the lower end of the cement clinker 8, it is possible to cool the cement clinker 3 from the kiln 1 before it is dropped onto the upper conveyance type cooling mechanism 16, and moreover, in the cement clinker 3 Large block clinker 3 '
Since it can be crushed by the breaker 42 into small pieces and then introduced into the upper transfer type cooling mechanism 16, the cooling efficiency of the cement clinker 3 and the heat recovery efficiency of the cooling air 7 can be further improved.

The cooling device for cement clinker according to the present invention is not limited to the above-mentioned embodiment, and it goes without saying that various modifications can be made without departing from the scope of the present invention.

[0039]

According to the cooling device for cement clinker of the present invention described above, various excellent effects as described below can be obtained.

(I) The cement clinker guided from the kiln is sorted into coarse particles, medium particles, fine particles, etc. by the transport type cooling mechanism of each stage to obtain the coarse and medium cement clinker having a relatively large heat capacity. Since the particles can be cooled in a uniform state, the cooling efficiency of the cement clinker can be greatly improved compared with the conventional one, and the overall equipment can be reduced compared to the conventional great cooler etc. You can

(II) Since the cooling air rising from the lower part of the transport cooling mechanism on the lower stage side is given a chance of heat exchange with the cement clinker every time it passes through the transport cooling mechanism on the upper stage side, combustion at a higher temperature than before Air for use can be obtained, and heat recovery efficiency can be improved.

(III) In the cement clinker cooling device according to the second aspect of the present invention, fine cement clinker falling from the transport type cooling mechanism at the lowermost stage can be cooled with coarse particles.
Since it can be separated from the medium-sized cement clinker into a filled state and can be efficiently cooled by the cooling air, the cooling efficiency of the cement clinker and the heat recovery efficiency of the cooling air can be further improved.

(IV) According to the cement clinker cooling device of the third aspect, the cement clinker from the kiln can be cooled before it is dropped onto the uppermost conveying type cooling mechanism, and further, the cement clinker is cooled. Since the large clinker in the inside can be crushed by a breaker and made into small lumps, the clinker can be guided to the uppermost transport cooling mechanism, so that the cooling efficiency of the cement clinker and the heat recovery efficiency of cooling air can be further improved.

[Brief description of drawings]

FIG. 1 is a sectional view of an embodiment of the present invention.

FIG. 2 is a perspective view of a lattice plate that constitutes an upper conveyance-type cooling mechanism according to an embodiment of the present invention.

FIG. 3 is a perspective view of a lattice plate that constitutes a lower conveyance type cooling mechanism in one embodiment of the present invention.

FIG. 4 is a detailed view of a breaker according to an embodiment of the present invention.

FIG. 5 is a cross-sectional view showing a conventional example.

6 is a detailed view of the transport type cooling mechanism of FIG.

[Explanation of symbols]

 1 Kiln 2 End part 3 Cement clinker 6 Outlet 7 Cooling air 15 Cooling device 16 Transport type cooling mechanism 17 Transport type cooling mechanism 18a Fixed lattice plate 18b Movable lattice plate 19a Fixed lattice plate 19b Movable lattice plate 20 Slit 21 Slit 32 Packing layer Cooler 37 Slit 38 Sliding plate 40 Air chamber 42 Breaker

Claims (3)

[Claims] 1. A cement clinker that is equipped with fixed grid plates and movable grid plates that are alternately arranged so that the end portions of the kiln are stacked one after another toward the outlet from a position below the end of the kiln, and falls from the end portion of the kiln. Are arranged in a plurality of stages vertically so that the movable lattice plates can be cooled by the cooling air jetted from the slits of each lattice plate while moving to the outlet through the reciprocating movement of the movable lattice plates. The cement clinker cooling device is characterized in that the slits of the lattice plate in the type cooling mechanism are formed to have a size capable of gradually selecting a small size clinker from the upper side toward the lower side. 2. A packed bed cooler capable of filling the cement clinker dropped from the slits of the lattice plate in the transport type cooling mechanism and introducing cooling air into the inside thereof is provided below the bottommost transport type cooling mechanism. The cooling device for a cement clinker according to claim 1, characterized in that. 3. A slidable plate having a slit having a size capable of dropping a cement clinker having a predetermined size or less is disposed between the end of the kiln and the uppermost transport type cooling mechanism, and the slidable plate is slid. The cooling device for a cement clinker according to claim 1 or 2, wherein an air chamber for introducing cooling air is formed in a lower portion of the plate, and a breaker is arranged at a position near a lower end portion of the sliding plate.