JPH09241049A - Clinker cooling equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide the equipment having a structure particularly capable of reducing clinker deposition in the space between a movable grate and a platelike metallic material on each of the side walls and inhibiting high temp. wear of each of the members. SOLUTION: This equipment consists of a fixed grate 5A and a movable grate 5B, each of which is longitudinally placed in the conveyance direction of clinker 21 of a high temp. and provided with a firebed 4 consisting of grate plates 50 and 51 that are arranged in the transverse direction, and also, a platelike metallic material 10A that is placed on each of the casing side walls so as to be opposite to the corresponding one of the side faces of the firebed 4. In the equipment, the clinker 21 is cooled by supplying air through the inside of each of the grate plates 50 and 51 while moving the clinker 21 placed on the firebed 4 with reciprocating motion of the movable grate 5A and also, air is supplied to the space between the metallic material 10A of each of the side walls and the firebed 4 from the underside to prevent the clinker 21 from falling into the space. Also, rectangular projecting parts are formed in the upper part of the side face of one of the plates 51, which plate 51 is used as one end of the firebed 4, that is opposite to the metallic material 10A, throughout the upper part so as to have a rectangularly uneven crosssectional shape and corresponding to the side face of this plate 51, the surface of the metallic material 10A is formed so as to have a similar rectangularly uneven crosssectional shape and further, each of the rectangular projecting parts of the side face of this plate 51 is provided with an air through-hole so as to form an air passage through the projecting part from the inside.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a slag cooling device for cooling a cement clinker (a slag) in a cement manufacturing plant with air while transferring it on a fire bed.

[0002]

2. Description of the Related Art As a device for cooling a fired clinker in a cement manufacturing process, there is a slab cooling device for cooling the clinker to a predetermined temperature by air while transferring the fired high-temperature clinker by a predetermined distance. Are known. 4 and 5 show an example of the conventional device.

As shown in FIG. 4, the raw material in the rotary kiln 1 is burned by the burner 2 and the cement clinker 2
1 and this high temperature clinker 21 is a rotary kiln 1.
It is put into the ingot cooling device 3 and cooled there to a predetermined temperature while being transferred there. The ingot cooling device 3 includes a casing made of furnace wall material, and inside thereof, a fire bed 4 made up of movable grate 5a and fixed grate 5b alternately arranged in the clinker transfer direction is installed. . The movable grate 5a and the fixed grate 5b are the fixed grate 5
The front end of b is arranged so as to overlap with the rear end of the movable grate 5a located in front of it, and the front end of this movable grate 5a is arranged so as to overlap with the fixed grate 5b located in front of it. 5b is divided into unit plates of a great plate in the lateral direction (also referred to as the width direction) orthogonal to the clinker transfer direction. Each movable grate 5a is configured to reciprocate by a drive device 6 installed in an air chamber 7 below the fire bed 4. The air chamber 7 is filled with air for cooling the clinker, and this cooling air is supplied by a blower 8 installed outside the chamber 7. A clinker outlet 9 is provided in front of the fire bed 4.

In the ingot cooling device as described above, a clinker (ingot) 21 having a temperature of approximately 1400 ° C. falls from the rotary kiln 1 into the ingot cooling device 3, and in the ingot cooling device 3, the clinker 21 is used. Is gradually transferred on the fire bed 4 by the reciprocating motion of the movable grate 5a in the front-rear direction, and is taken out through the discharge port 9 in the front. Clinker 21 is on the fire bed 4
While forming a layer on the top and moving, it is rapidly cooled by the cooling air supplied upward from the air chamber 7 through each great plate.

FIG. 5 is a sectional view of the movable grate 5a in the conventional apparatus, which is taken along the line VV in FIG. The movable grate 5a is composed of the plurality of grate plates 50 arranged side by side as described above, and the fixed grate 5b has the same structure. Ingot cooling device 3
The side wall metal fitting 10 is arranged at a position facing the side surface of the fire bed 4 on the furnace wall of the casing. That is, the fire bed 4 composed of the movable grate 5a and the fixed grate 5b is
Is disposed so as to have a constant gap between the side surface of the furnace and the inner surface of the side wall of the furnace, and the side wall metal 10 extends in the moving direction of the clinker 21 at the position facing the side surface of the fire bed 4 on the inner surface of the side wall of the furnace. It is provided. Particularly, the movable grate 5a has a structure in which a constant gap is maintained even when the movable grate 5a reciprocates with a constant stroke, and the movable grate 5a and the furnace side wall metal 10 do not interfere with each other. It is prevented from falling into the air chamber 7 through the gap.

Further, the air chamber 7 under the fire bed 4 is filled with cooling air pressurized by the blower 8, and the gaps between the front and rear great plates 50 and the side wall metal 1
The gap between 0 and the side surface of the great plate 50 opposite to this is sealed with cooling air to prevent the fine clinker from falling.

[0007]

However, when the clinker is caught in the gap between the movable grate and the side wall metal object, it is not possible to remove all of the caught clinker by only the pressure of the seal air under the fire bed. The clinker gradually accumulates in the gap between the side wall metal pieces, and the accumulation of the clinker makes it more difficult for the seal air to pass through the gap between the great plate and the side wall metal piece, and the deposition is accelerated. Due to this clinker biting and accumulation, the relative movement of the movable grate and the side wall metal pieces causes wear on the mutually opposing surfaces, which promotes the clearance, increases the clinker drop from the top of the grate, and reduces the amount of sealing air. Therefore, the cooling effect of the side wall metal member itself is reduced, and high-temperature wear occurs faster than other portions where the gap is held. This significantly shortens the life of the great plate, increases maintenance costs, and hinders long-term continuous operation.

The present invention has been made to solve these problems, and reduces the clinker accumulated in the gap between the movable grate and the side wall metal article so that the side wall metal article and the great plate forming the gap face each other. An object of the present invention is to provide a slab cooling device having a structure capable of suppressing surface wear.

[0009]

In order to achieve the above object, the first slab cooling apparatus of the present invention comprises fixed grades alternately arranged in the clinker conveying direction for conveying the clinker charged from the cement kiln. And a movable grate, and each of these grate is a fire bed composed of a grate plate which is arranged in a direction orthogonal to the clinker transport direction, a casing composed of a furnace material wall surrounding the fire bed, and a side wall of the casing. Of the plate-shaped side wall metal fitting which is attached to the side surface of the clinker in the conveying direction of the clinker, an air chamber provided under the fire bed, and a drive device for reciprocating the movable grate in the clinker conveying direction. While moving the clinker on the fire bed by the reciprocating motion of the clinker, air is supplied upward through the inside of each Great Plate to cool the clinker and A device configured to supply air from below to the gap between the side wall metal fittings and the side wall metal fittings to prevent the clinker from spilling out. A convex part with a rectangular cross section is formed over the upper part to make this side surface uneven, and the side wall metal surface has an uneven shape corresponding to the shape of the side surface of each end great plate, the side surface of each end great plate A gap is provided between the uneven surface and the uneven surface on the side of the side wall metal, and an air hole penetrating from the inside to the side surface is provided in the projection on the side surface of the end great plate.

The upper gap formed between the convex surface on the side surface of the end great plate and the concave surface on the side wall metal fitting is defined by the lower gap formed between the concave surface on the side surface of the end great plate and each convex surface on the side wall metal fitting. It is preferable to make it wider than the gap and to make the air holes provided on the side surface of the end great plate have a downward slope. Further, the air pressure supplied upward through the inside of each great plate and the air pressure separated from this air and supplied to the side surface through the air hole provided on the side surface of the end great plate are provided in the gap between the side wall metal object and the side surface of the great plate for the end portion. The pressure is preferably higher than the air pressure supplied from below.

In the second ingot cooling device of the present invention, instead of the air holes provided in the end great plate in the first ingot cooling device, the convex faces of the end great plates are opposed to each other. Air holes penetrating from the outside to each concave surface on the side wall hardware side are provided, and an air source for supplying air to these air holes is provided.

In the first slab cooling apparatus, the sealing air flows upward from the lower gap between the end great plate and the side wall metal through the upper gap, and at the same time, it is provided on the convex portion of the end great plate. Since air is also supplied from the air holes, even if the clinker is caught in the upper clearance and begins to accumulate, and the supply of sealing air from the lower clearance decreases, it is provided on the side of the end great plate. The air supplied from the air holes supplements the clinker removal action and prevents further clinker deposition. Further, the air supplied from the air holes also has the effect of cooling the side wall metal. Further, in the second slab cooling apparatus, the air supplied from the cooling holes provided in the side wall metal supplements the function of the sealing air, and prevents the clinker accumulation in the same manner as above.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A slab cooling apparatus according to an embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is an overall configuration diagram of an ingot cooling device according to the present invention, and FIG. 2 is a diagram for explaining shapes of parts constituting the ingot cooling device.

The ingot cooling device 3A of one embodiment is almost the same as the conventional device shown in FIGS. 4 and 5 from the overall structure. However, the shape of the side wall metal fittings provided on the side wall of the furnace and the shape of the great plate facing the side wall metal fittings of the great plates constituting the fire bed are different from the conventional ones, and the cooling air in the conventional device is In addition to the blower that supplies air, another blower that supplies air to the gap between the side wall hardware and the fire bed is different.

As shown in FIG. 1, the ingot cooling device 3A is
A fire bed 4 composed of a movable grate 5A and a fixed grate 5B for transferring the high temperature clinker 21 fed from the rotary kiln, an air chamber 7 provided under the fire bed 4, and a pipe passing through the air chamber 7. 18 through the channel beam 14
Cooling air 1 for each Great 5A, 5B through the internal flow path
A blower 8A for supplying 9 and a blower 8B for supplying the sealing air 20 to the gap between the side surface of the fire bed 4 and the side wall metal 10A provided on the side wall of the furnace through the air chamber 7 are provided.

Each movable grate 5A is constructed by arranging the grate plates 51, which characterize the present invention, on both sides, and interposing the conventional grate plates 50 between them in a row. Each fixed grate 5B also has grate plates 50 and 51 similarly arranged. The great plates 50 and 51 arranged side by side are fixed by the channel beam 14, and the great plates 50 and 51 and the channel beam 14 form an air flow path.

FIG. 2 shows a great plate 5 according to the present invention.
1 and 10 A of side wall metal fittings are shown. As shown in FIG. 2, the side surface of the great plate 51 facing the side wall metal fitting 10A is
A protrusion 52 having a rectangular cross section is formed on the upper portion thereof like a crosspiece, and the protrusion 52 extends in the longitudinal direction of the side surface. Here, the lower lower portion following the convex portion 52 is referred to as a concave portion 53, and the boundary between the convex portion and the concave portion is referred to as a step portion 54. On the other hand, side wall hardware 1
0A corresponds to the shape of the side surface of the great plate 51, the lower part is the rectangular cross-section convex part 11 and the upper part is the concave part 12,
A step portion 13 is provided at the boundary between them.

In this slag cooling device 3A, in the fire bed 4 and the side wall metal article 10A, the convex portion 52 and the concave portion 53 of the great plate 51 face the concave portion 12 and the convex portion 11 of the side wall metal article 10A, respectively, and the step portion 54. And the stepped portion 13 face each other, and are installed so as to have a predetermined gap between each facing surface. The upper gap 15 between the convex portion 52 of the great plate 51 and the concave portion 12 of the side wall metal fitting 10A.
However, the recess 53 of the great plate 51 and the side wall hardware 10A
It is formed so as to be wider than the lower gap 16 between the convex portions 11 of, and further, in the convex portion 52 of the side wall of the great plate 51,
An air supply hole 17 having a downward slope from the inner space of the great plate 51 is provided.

In these configurations, the movable grate 5A
While the clinker 21 on the fire bed 4 consisting of the fixed grate 5B and the fixed grate 5B is transferred while being cooled, the clinker 21 tries to enter the gap 15 between the side wall metal 10A and the grate 5A, 5B. Air supply hole 17 on the side of 5B (the side of the great plate 51 when viewed locally)
It is blown away by the high-pressure air 19 delivered from the. Note that the air 19 is 100 to 60 more than the sealing air 20.
It is supplied at a pressure as high as 0 mmAq. Moreover, since the upper gap 15 is wider than the lower gap 16, the high-pressure air 19 is less likely to pass through the lower gap 16 having high resistance, and the upper gap 15
It flows upward. Therefore, the clinker on the great plates 5A, 5B is less likely to enter the gap than when only the sealing air 20 is used, and the clinker biting phenomenon is also reduced. Further, the side wall metal fitting 10A can be continuously cooled by the high-pressure air 19 sent from the air supply hole 17 on the side surface of the great plate 51 to improve the self-cooling effect, and the side wall metal fitting 10A can reduce the wear of the great plate 51.

Next, another embodiment of the present invention will be described with reference to FIG. In this embodiment, the side wall metal article 10 and the great plate 52 facing the side wall metal article 10 are each formed with an uneven portion in the same manner as described in FIG. on the other hand,
The high-pressure air sent into the gap between the side wall metal fitting 10B and the great plate 52 is configured to be supplied through the side wall metal fitting 10B, unlike the case of the great plate shown in FIG. An air supply hole 17A having a downward slope is formed in the concave portion of the side wall metal member 10B, and cooling air is directly supplied to the gap from the blower 8C installed outside the air chamber 7 through the air pipe 22 and the air supply hole 17A. Is configured as follows. Even in such a configuration, the effects of preventing the clinker from being caught and reducing the wear of the side wall metal 10A and the great plate 51 can be obtained.

[0021]

According to the present invention, the side surface of the fire bed of the incineration cooling device and the side surface of the side wall metal object on the side of the furnace wall facing the side surface of the fire bed are formed in a vertical uneven surface so as to face each other. Since the air is provided from the air hole provided on the side surface of the end great plate to the upper gap among the gaps formed by these uneven surfaces, the air supplied laterally from this air hole is , Since it is supplied to the clinker that is trying to accumulate in the gap between the side wall hardware and the end great plate, especially the movable great plate, from the direction different from the seal air from below, it does not interact with the seal air. The action makes it easier to prevent clinker accumulation and reduces the wear of both members. Furthermore, the air supplied from the air holes can cool the side wall metal parts, which reduces the high temperature wear of the side wall metal parts and greatly extends the service life. Can. Therefore, the maintenance cost of the device can be reduced and long-term continuous operation becomes possible.

Further, instead of the air holes of the end great plate, if the air holes are provided in the side wall metal correspondingly, the wear of the members due to the clinker accumulation can be similarly reduced, which leads to the reduction of the maintenance cost and the long-term continuous operation. Is possible.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a configuration of a slab cooling device of the present invention.

FIG. 2 is a detailed cross-sectional view of an end great plate and a side wall metal piece according to an embodiment of the present invention.

FIG. 3 is a detailed cross-sectional view of another embodiment of the present invention.

FIG. 4 is a sectional view showing a configuration of a conventional ingot cooling device.

FIG. 5 is a sectional view taken along line II-II of FIG. 4;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 rotary kiln 2 burner 3, 3A ingot cooling device 4 fire bed 5A movable grate 5B fixed grate 6 drive device 7 air chambers 8A, 8B, 8C blower 9 exhaust port 10A, 10B side wall metal 11 side wall metal projection 12 side wall Recessed metal parts 14 Channel beam 15 Upper clearance 16 Lower clearance 17, 17A Air supply hole 18 Cooling air piping 19 Cooling air (high pressure) 20 Seal air 21 Clinker 22 Air piping 52 End great plate projection 53 End Great plate recess

Claims (5)

[Claims] 1. A fixed plate and a movable plate which are arranged alternately in the clinker transfer direction for transferring the clinker charged from the cement kiln, and each of the grates is formed from a great plate which is arranged in a direction orthogonal to the clinker transfer direction. A fire bed, a casing made of a furnace material wall surrounding the fire bed, a side wall of the casing, and a plate-shaped side wall metal member attached to the side surface of the fire bed in the clinker conveying direction, and a bottom of the fire bed. It is equipped with an air chamber and a drive device that reciprocates the movable grate in the clinker conveyance direction, and while moving the clinker on the fire bed by the reciprocating motion of the movable grate, air is supplied upward through the inside of each great plate. Cooling the clinker and supplying air from below to the gap between the side of the fire bed and the side wall hardware to prevent the clinker from falling off. In the ingot slag cooling device described above, a protrusion having a rectangular cross section is formed over the upper portion of the side surface of each end plate facing the casing side wall metal fitting of each great plate, and the side surface is formed into an uneven shape. The metal surface is made to have an uneven shape corresponding to the shape of the side surface of each end great plate, and a gap is provided between the uneven surface of the side great plate for each end and the uneven surface of the side wall metal, and the end great An ingot cooling device, characterized in that a convex portion on a side surface of the plate is provided with an air hole penetrating from the inside to the side surface. 2. The upper clearance formed between the convex surface of the side wall of the end plate and the concave surface of the side wall metal fitting is smaller than the lower clearance formed between the concave surface of the side wall of the end great plate and the convex surface of the side wall metal fitting. The ingot cooling device according to claim 1, wherein the ingot cooling device is widened and the air holes provided on the side surface of the end great plate are inclined downward. 3. The air pressure supplied upward through the inside of each great plate and the air pressure supplied to the side surface through an air hole provided on the side surface of the end great plate are supplied from below to a gap between the side wall metal member and the side surface of the great plate for end. The ingot cooling device according to claim 1 or 2, wherein the air pressure is higher than the air pressure supplied. 4. A fixed grate and a movable grate, which are put in from a cement kiln and convey a clinker, are alternately arranged in the clinker conveying direction, and each of the grate is composed of a great plate arranged in a direction orthogonal to the clinker conveying direction. A fire bed, a casing made of a furnace material wall surrounding the fire bed, a side wall of the casing, a plate-shaped side wall metal object attached to the side surface of the fire bed in the clinker conveying direction, and a bottom of the fire bed. Equipped with an air chamber provided and a drive device that reciprocates the movable grate in the clinker conveyance direction, while moving the clinker on the fire bed by the reciprocating motion of the movable grate, supplying air upward through each great plate. It is configured to cool the clinker and to supply air from below to the gap between the side of the fire bed and the side wall hardware to prevent the clinker from falling. In the ingot cooling device, a protrusion having a rectangular cross section is formed over the upper part of the side surface of each end plate facing the casing side wall metal piece of each great plate to form the side surface into an uneven shape, and the side wall. The metal surface is made to have an uneven shape corresponding to the shape of the side plate of each end part, and a gap is provided between the uneven surface of the side plate of each end part and the uneven surface of the side wall metal part, and An ingot cooling device comprising an air hole penetrating from the outside to the concave surface of the side wall metal piece and an air source for supplying air to the air hole. 5. The upper gap formed between the convex surface of the side wall of the end great plate and the concave surface of the side wall metal fitting is defined as the lower gap formed between the concave surface of the side wall of the end great plate and the convex surface of the side wall metal fitting. 5. The ingot cooling device according to claim 4, wherein the ingot cooling device is made wider and the air holes provided on the side surface of the side wall metal member are inclined downward.