JPS6315760Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a device for cooling high-temperature baked ingots such as cement clinker, and more particularly to a baked ingot cooling device that can uniformly cool a layer of baked ingots on a grate.

As one of the devices for cooling high-temperature baked ingots such as cement clinker, the baked ingots are dropped onto a grate consisting of a fixed grate and a movable grate to form a layer, and this layer of baked ingots is transported a certain distance while There is a device that uses cooling air to cool down to a predetermined temperature. To explain this using cement clinker as an example, cement clinker is fired at a high temperature of approximately 1400 to 1500℃ in a rotary kiln, and is gradually moved toward the discharge port by the operation of a grate, during which time it is used for cooling. Cooled by air to approximately 80-100°C.

Figures 1 and 2 show details of the ingot cooling device.

In the figure, 1 is a rotary kiln, 2 is a sintered ingot cooling device main body, 3 is an upper grate, and 4 is a lower grate. Each of these grates 3 and 4 has a movable grate 5 and a fixed grate 6 arranged alternately in the baked ingot transfer direction It is configured to be moved. 7 and 8 are movable beams that support the movable grate 5, and 9 and 10 are drive devices that operate these movable beams 7 and 8. 16, 17, 18, 19
2 is an air chamber defined under the grate 3 or 4, 20 is an exhaust port, and 21 and 22 are side walls of the main body of the cooling device.

In the above-described apparatus, the high-temperature baked ingots discharged from the rotary kiln 1 range in size from 1 mm or less in diameter to as large as about 1 m in diameter.
In this case, the rotation of the rotary kiln classifies the baked ingots according to their particle sizes, and the particle size distribution of the baked ingot layer formed by falling onto the grate becomes non-uniform. That is, to explain it specifically using FIG. 2, the light fine grains of the baked ingot in the rotary kiln 1 move to the surface due to the rotation of the rotary kiln 1, and fall in this state onto the grate, so that the fine grains are When looking at the width direction of the grate 3, it falls intensively on the rotational direction Y side of the rotary kiln 1, forming a fine grain layer 25a. In addition, the code|symbol 25b is a coarse grain layer. When an imbalance occurs in the grain size distribution of the baked ingot layer, most of the cooling air passes through the coarse grain layer, which has less ventilation resistance, because the fine grain layer has greater ventilation resistance. As a result, the fine grain layer becomes extremely insufficiently cooled, causing problems such as burnout of the grate.

The purpose of this invention is to maintain a low layer height in the fine grain layer of the baked ingot layer formed on the grate with uneven particle size distribution, to ensure good cooling of the baked ingot and to prevent burnout of the grate. This is the constructed baked ingot cooling device.

In short, this idea connects fixed grates placed one behind the other in the direction of conveyance of baked ingots with a bridging grate on the grate surface where the fine grain layer is intensively formed. A barrier layer is formed, and this barrier layer prevents the baked ingots from moving from the coarse grain part with a high bed height to the fine grain part with a low bed height, thereby equalizing the air flow velocity distribution in the width direction of the grate. This is what I did.

Examples of this invention will be described below.

In FIG. 4, reference numeral 26 indicates a bridging grate placed between the fixed grate 6, 6 arranged in front and behind in the direction of transfer of the baked ingots, and 28a, 28b indicates the bridging grate 26 between the fixed grate 6. This is an attachment member attached to the grate support 27.

FIG. 5 shows the state in which this bridging grate 26 is attached, and this bridging grate 26 is attached to at least one row of grate in the baked ingot transfer direction X. Also, symbols 5a and 5b in the figure (indicated by diagonal lines)
The grate is a blind plate with no ventilation holes for cooling air to prevent it from flowing down the cooling device without being sufficiently cooled due to the fluidization of the hot fine grain layer.

In the above apparatus, the baked ingots that have fallen from the rotary kiln 1 onto the grate are deposited in a mountain shape around the center of the fall in the width direction of the grate. Further, as described above, since the fine grains are unevenly distributed in the rotational direction of the rotary kiln 1, the height of the fine grain layer 25a on the side portions is lower than the coarse grain layer 25b on the center side as shown in FIG. Next, as shown in Figure 5, the third
Regarding the rows, one movable grate 5 is provided downstream of each bridging grate 26, and a barrier layer 2 on the upper surface of the bridging grate 26 allows the movement of baked ingots to be slow.
5c is formed.

Furthermore, when the movable grate 5 between the bridging grate 26 is made of a blind plate without ventilation holes, the number of high-temperature powder particles crossing this portion will be reduced.

When such a structure is adopted, a slow-moving barrier layer 25c forms a thick coarse grain layer 25b (low ventilation resistance per unit layer thickness) and a thin powder layer 25a as shown in FIG. (high ventilation resistance per unit layer thickness) is formed, and 25 coarse grain layers are formed per layer on the grate.
The difference in ventilation resistance between b and the fine grain layer 25a is small, and the baked ingot can be cooled averagely and effectively without so-called blow-through. By forming this barrier layer 25c, the height of the fine grain layer 25a is kept lower than that of the coarse grain layer (for example, about 80%), and the fine grain layer with high ventilation resistance and the coarse grain layer with low ventilation resistance are cooled. Air passage can be averaged. Note that by forming the blind plate 5a, extreme fluidization of the fine grain layer 25a can be prevented, and a phenomenon in which fine grains that are insufficiently cooled can be prevented from rapidly flowing down the inside of the cooling device.

By implementing this idea, the ventilation resistance of the layers becomes the average of the coarse grain layer and the fine grain layer, and the baked ingots classified into coarse grains and fine grains can be cooled well. There are no problems such as burnout of the grate.

[Brief explanation of the drawing]

Figure 1 is a sectional view of the baked ingot cooling device, and Figure 2 is the sectional view of the sintered ingot cooling device.
3 is a plan view of the grate of the baked ingot cooling device according to this invention, FIG. 4 is a side view of the grate showing the installation state of the bridging grate, and FIG. Enlarged partial view of the figure, Figure 6 is the 5th
It is a sectional view taken along the - line in the figure. 2... Baked ingot cooling device, 3, 4... Grate, 6
...Fixed grate, 25a...Fine grain layer, 25b...
Coarse grain layer, 25c...barrier layer, 26...crosslinked grate.

Claims (1)

[Scope of utility model registration request] A grate is formed by alternately arranging movable grates and fixed grates in the direction of conveyance of the baked ingots, and one or more rows of blind plates are provided on the left and right side walls of the grate including the most upstream end for the flow of the baked ingots. In the apparatus for cooling the baked ingot while transferring the grate, at least one or more bridging grate is attached to the fixed grate in the grate row adjacent to the row of blind plates. A uniform cooling type baked ingot cooling device characterized by forming a barrier layer of baked ingots on a surface.