JPS589199Y2 - Baked product cooling machine - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an improvement of a calcined product cooler that cools lime, cement clinker-1 sintered ore, etc. calcined in a rotary kiln or the like using air.

In the air-using fired product cooler attached to the rotary kiln, the air after heat exchange is used as the kiln's secondary air, but if dust is mixed into the kiln's secondary air, the firing operation in the kiln becomes extremely difficult.

Therefore, in the fired product cooler as described above, it is necessary to suppress the amount of dust generated during heat exchange.

However, as shown in Fig. 1, all of the conventional fired product cooling machines that use air have the fired product flow path A set at an angle of repose greater than the angle of repose of the fired product B, and the fired product B is allowed to fall under its own weight while being Air D' is sent in from box C to perform heat exchange, and air E after heat exchange is used as secondary kiln air E.

In this type of cooling machine, air is sent to the place where the baked product is falling under its own weight, so that air blow-through occurs, and a large amount of dust is sometimes generated in the blow-through.

Therefore, in order to make it possible to use the secondary kiln air that does not contain dust in such conventional equipment, it is possible to consider methods such as providing a dust collection means or reducing the amount of air to suppress the amount of dust generated. However, both are undesirable because they lead to complication of the device or a decrease in cooling capacity.

In view of the above circumstances, the purpose of this invention is to provide a cooling device for fired products that uses air, which can minimize the amount of dust generated during heat exchange, and which does not complicate the device or reduce cooling capacity. The gist of the system is to provide a fired product cooling machine comprising a flow path for a material to be cooled for cooling the material to be cooled with air while flowing the material, the flow path being set at an angle less than or equal to the angle of repose of the material to be cooled. A cooling air supply port is provided at the bottom of the flow path so that air can flow downward into the flow path, so that the flow path is configured so that the material to be cooled is directed downward by the inflowing air. A fired product cooling machine is characterized in that it is configured as an air slider that cools while flowing.

Hereinafter, the present invention will be described in detail with reference to embodiments shown in the drawings.

FIG. 2 is a conceptual diagram showing an embodiment of the baked product cooling device according to the present invention.

In the figure, 1 is a rotary kiln, 2a is the kiln 1
3 is a hopper that collects the fired product 2a; 4 is a flow path for the fired product, that is, the material to be cooled 2b falling from the hopper 3; 4a is a flow path for the fired product 2a; A cooling air supply port provided at the bottom, 5 is the upper space of the flow path 4 and is a passage for air that has completed heat exchange, that is, the kiln secondary air, 6 is a wind box, 7 is a blower, 8 is a duct, and 9 is a A damper, 10 is a piston feeder, 11 is a screw conveyor, 12 is a heat storage chamber, and 14 is a flash stopper.

The material flow path 4 to be cooled is formed in the shape of a gutter with an open upper surface, and a cooling air supply port 4a is provided at the bottom of the flow path 4 to allow air to flow downward into the flow path.

The cooling air supply port 4a is provided with a grid 1 at the bottom of the flow path 4.
It is formed by arranging 3.

The lattice 13 is formed by arranging a plurality of lattice members 13a at predetermined intervals, and if necessary, each lattice member 13a may be divided in the width direction and configured to be replaceable.

The flow path 4 configured in this manner is arranged to be inclined by an angle α, and this inclination angle α is determined to be equal to or less than the angle of repose of the material to be cooled 2b.

That is, the flow path 4 is arranged at an angle equal to or less than the angle of repose of the material to be cooled 2b, and is configured as an air slider.

Note that the lower limit of the range that can be taken as the inclination angle α is not particularly limited; It's good to have.

Further, the air supply port 4a may be formed in any manner as long as the purpose of the cooler can be achieved.

The hopper 3 forms a heat storage chamber 12, and this heat storage chamber 12
Accordingly, the quicklime etc. fired by the rotary kiln 1 can be aged.

Next, the operation of this cooler will be explained.

The fired product 2a discharged from the end of the rotary kiln 1 falls into the heat storage chamber 12, moves from the heat storage chamber 12 to the trough-shaped cooled material flow path 4 provided below the angle of repose, and stagnates there.

- Pre-cooling air F is supplied by the blower 7 via the duct 8 and the wind box 6 to the air supply port 4a at the bottom of the flow path 4.

Therefore, the material to be cooled 2b in the flow path 4 is
The air flows downward due to the air slide effect while being cooled by the cooling air supplied from the air.

The fired product cooled in this way is transferred to the piston feeder 1.
0 to the screw conveyor 11, and the cooled air G is sent to the passage 5 to be used as secondary kiln air.
through the rotary kiln.

In this cooling machine, which has the above-mentioned configuration, the flow path of the material to be cooled is arranged below the angle of repose of the material to be cooled, and the material to be cooled is cooled while flowing downward by the air slide effect of the cooling air. .

Therefore, it is possible to prevent the blow-through of air and the disorderly flow of the material to be cooled, which occur in an apparatus in which the material to be cooled falls downward by its own weight, and the generation of dust can be suppressed to a small level.

In other words, by causing the material to be cooled to flow due to the air slide effect, the air flow becomes gentle, the material to be cooled partially floats, creating a uniform and extremely smooth flow, and stable fine particles are formed in the upper layer. Since a layer is formed, it is possible to suppress the generation of dust due to air blow-through or disorderly flow of the material to be cooled.

Next, 150℃ of calcined lime at 1000℃ is added to the main cooler.
We tested the amount of dust generated when cooled to below ℃.
The results will be described below.

The test conditions are as follows.

(2) Amount of cooling air used per 1 kg of material to be cooled...
...0°5-1.5Nm3/kg (3) Gutter inclination angle...10-35°When calcined lime was cooled under the above conditions, the dust content of the air after heat exchange was 1Nm3 of dry air. It was 2~ggr per hit.

As you can see from this test result, if you use this cooler,
It was possible to suppress the amount of dust generated, and therefore it was possible to use the cooled air favorably as secondary air for the kiln.

[Brief explanation of drawings]

FIG. 1 is a conceptual diagram showing a conventional cooling device, and FIG. 2 is a conceptual diagram showing an embodiment of the cooling device according to the present invention. 1... Rotary kiln, 2a... Baked product, 2b... Material to be cooled, 4... Material flow path to be cooled, 4a... Cooling air supply port.

Claims (1)

[Scope of utility model registration request] In a fired product cooling machine comprising a flow path for a material to be cooled for air cooling while flowing the material, the flow path is arranged to be inclined at an angle equal to or less than the angle of repose of the material to be cooled, and the flow path A cooling air supply port is provided at the bottom of the flow path so that air can flow downward into the flow path.
A fired product cooling machine characterized in that it is configured as an air slider that cools the material to be cooled while flowing it downward by the inflowing air.