JP2001330373A - Cooler for sintered ore - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cooler which can prevent the trouble in an after process by cooling enough sintered ore even in the case that the quantity of produced sintered ore increases. SOLUTION: This cooler has a hood for covering sintered ore shifting within the cooler itself, a heat exchanger for recovering the exhaust heat of hot blast recovered from the hood, a circulation pipe for circulating the hot blast at a relatively low temperature having its exhaust heat recovered to the downside of sintered ore under the hood, an outside air inlet for sucking outside air into the circulation pipe and mixing it with hot blast at a relatively low temperature, and a damper being arranged in a branch pipe for sending the cooling gas within the circulation pipe to an exhaust cylinder, being branched from the circulation pipe.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cooling apparatus for cooling a hot-crushed sintered ore after being discharged from a sintering machine, and more particularly to a cooling apparatus which sufficiently cools a fluctuation in the production amount of the ore. The present invention relates to a cooling device capable of maintaining a capacity.

[0002]

2. Description of the Related Art Generally, sintered ore discharged from a sintering machine is usually hot crushed to a size of about 100 to 200 mm, and after removing powdered ore with a hot sieve, the sinter is cooled. And then crushed and sized. Hot crushed sintered ore is rapidly cooled by sprinkling cooling or the like, so that fine cracks or the like are generated and the strength of the sintered ore is reduced. Therefore, the ore is generally cooled using an air-cooled cooling device.

FIG. 2 is a layout diagram showing a configuration of a conventional air-cooled cooling device, and is shown together with a block diagram of a piping system. The arrow in FIG. 2 indicates the moving direction of the sintered ore placed on the conveyor. The sintered ore 3 discharged from the sintering machine is placed on the conveyor 2 via the chute 1 and moved after being hot-crushed. Sinter 3 placed on conveyor 2
A hood is disposed above the hood, and the hood is provided with a partition plate 6.
The upstream hood becomes the exhaust heat recovery zone hood 4 and the downstream hood becomes the non-exhaust heat recovery zone hood 5.

When the hot crushed sintered ore 3 is placed on the conveyor 2 from the chute 1, dust scatters and mixes with the hot air recovered from the exhaust heat recovery zone hood 4. Therefore, the hot air collected from the waste heat recovery zone hood 4 is
After the dust is removed by the dust collector 13, the dust is sent to the heat exchanger 7 and the exhaust heat is collected. The relatively low-temperature hot air from which the exhaust heat has been recovered (hereinafter referred to as “hot air after exhaust heat recovery”) is supplied to the circulation fan 9.
Is blown to the lower side of the sintered ore 3 moving under the exhaust heat recovery zone hood 4 through the circulation pipe 10. The hot air generated by cooling the sintered ore 3 by the hot air after the exhaust heat recovery is recovered from the exhaust heat recovery zone hood 4 again, and the exhaust heat is recovered and circulated by the heat exchanger 7.

[0005] When the sintered ore is cooled using the air-cooled cooler, hot air is generated. If the exhaust heat is recovered from the hot air and used as a heat source for various devices, it is effective in reducing the unit fuel consumption. Therefore, various techniques have been proposed in order to efficiently recover the exhaust heat of hot air generated from a sinter cooler. For example, Japanese Patent Publication No. Sho 62-17014 discloses a sintering equipment cooler for recovering exhaust heat. This technology reduces the equipment cost and operating cost by further dividing the exhaust heat recovery zone hood 4 into two parts, the upstream side and the downstream side, and providing a dust collector only in the pipe connected to the upstream side exhaust heat recovery zone hood. What you want to do. However, with this device, when the production amount of the sinter increases, the exhaust heat of the hot air collected from the exhaust heat recovery zone hood cannot be sufficiently recovered. As a result, the temperature of the hot air after exhaust heat recovery becomes high, and the cooling of the sintered ore becomes insufficient. As a result, when the sinter is fed from the cooler to the subsequent process, there is a problem that the rubber belt of the belt conveyor is burned.

[0006]

DISCLOSURE OF THE INVENTION The present invention solves the above-mentioned problems, and allows the sinter to be sufficiently cooled even if the production amount of the sinter increases, thereby preventing troubles in the post-process. An object of the present invention is to provide a cooling device for condensate.

[0007]

SUMMARY OF THE INVENTION The present invention is a cooling device for a sintered ore discharged from a sintering machine and then hot crushed, wherein the ore moving on a conveyor is moved upward. Exhaust heat recovery zone hood to cover from, heat exchanger to recover the exhaust heat of the hot air recovered from the exhaust heat recovery zone hood, and the hot air after the exhaust heat recovery to the lower side of the sintered ore under the exhaust heat recovery zone hood A circulating pipe with a circulating fan to circulate, an outside air suction port that sucks outside air into the circulating pipe and mixes it with the hot air after exhaust heat recovery, and branches from the circulating pipe to send cooling gas in the circulating pipe to the exhaust stack This is a cooling device for sinter having a branch pipe to be supplied and a damper disposed in the branch pipe.

[0008]

FIG. 1 is a layout diagram showing an example of a cooling device according to the present invention, which is shown together with a block diagram of a piping system. The arrow in FIG. 1 indicates the moving direction of the sintered ore placed on the conveyor. The sintered ore 3 discharged from the sintering machine is placed on the conveyor 2 via the chute 1 and moved after being hot-crushed. Sinter 3 placed on conveyor 2
A hood is disposed above the hood, and the hood is provided with a partition plate 6.
The hood on the upstream side is an exhaust heat recovery zone hood 4 and the hood on the downstream side is a non-exhaust heat recovery zone hood 5
Becomes

The hot air recovered from the waste heat recovery zone hood 4 is sent to a heat exchanger 7 to recover the waste heat. In order to mix the hot air after the recovery of exhaust heat with the outside air, an outside air suction port 8 is provided in the circulation pipe 10 on the outlet side of the heat exchanger 7 to suck the outside air. Since the temperature of the outside air is lower than that of the hot air after the recovery of the exhaust heat, the temperature of the gas obtained by mixing the hot air after the recovery of the exhaust heat and the outside air (hereinafter referred to as cooling gas) is lower than the temperature of the hot air after the recovery of the exhaust heat. Further decline. Therefore, when the cooling gas is used, the cooling efficiency of the sintered ore 3 is improved.

Although not shown in FIG. 1, a dust collector may be provided on the inlet side of the heat exchanger 7. The cooling gas is
Using the circulation fan 9, the air is sent to the lower side of the sintered ore 3 moving under the exhaust heat recovery zone hood 4 through the circulation pipe 10.
The hot air generated by the cooling gas cooling the sinter 3 is recovered from the exhaust heat recovery zone hood 4 again,
Exhaust heat is recovered and circulated by the heat exchanger 7.

If the outside air is excessively sucked from the outside air suction port 8, the flow rate of the cooling gas also increases. When the flow rate of the cooling gas is excessive, a large amount of dust is mixed in the hot air collected from the exhaust heat recovery zone hood 4 to cause clogging of the pipes in the heat exchanger 7, This may cause the generation of heat exceeding the capacity. Therefore, a branch pipe 13 having a damper 12 is provided in the circulation pipe 10 in order to adjust the flow rate of the cooling gas.

That is, when the flow rate of the cooling gas in the circulation pipe 10 is excessive, the damper 12 is opened and a part of the cooling gas is introduced into the branch pipe 11. The cooling gas introduced into the branch pipe 11 in this manner is dust-removed by the dust collector 13 and then is radiated from the exhaust pipe 15 by the exhaust fan 14. In addition, dust is scattered when the hot crushed sintered ore 3 is placed on the conveyor 2 from the chute 1, and after the dust is mixed with the cooling gas in the exhaust heat recovery zone hood 4,
Before being emitted from the exhaust stack 15, the dust is removed by the dust collector 13. That is, when the sintered ore 3 moves below the non-exhaust heat recovery zone hood 5, no dust is generated. Further, the temperature of the sintered ore 3 is also lowered. Therefore, there is no problem even if the gas collected from the non-exhaust heat recovery zone hood 5 is radiated to the outside air by the exhaust fan 16.

[0013]

[Example] In a sintering machine with an effective grate area of 200 m ² ,
A conventional cooling machine as shown in FIG. 2 was disposed on the outlet side of the sintering machine, and the sintering machine was operated. This is a comparative example. In this comparative example, if the productivity of the sintering machine, that is, the production rate per hour exceeds 460 t / hr, the temperature of the sinter ore on the outlet side of the cooling machine exceeds 100 ° C. The problem arose. Therefore, the productivity of the sintering machine was up to 460 t / hr.

Next, as shown in FIG. 1, a branch pipe having a dust collector 13 and an exhaust pipe 15 is provided with an outside air intake port 8 in a circulation pipe 10.
The sintering machine was operated using the cooling device of the present invention in which the damper 12 was provided in 11. This is an example of the invention. In this example of the invention, even when the sintering machine was operated at a productivity of 540 t / hr, the temperature of the sinter on the outlet side of the cooling machine was 100 ° C. or less, and there was no transportation problem.

Therefore, when the productivity (t / hr) of the sintering machine was compared between the invention example and the comparative example, the invention example increased by 17% compared with the comparative example.

[0016]

According to the present invention, even when the production amount of the sinter is increased, the sinter can be sufficiently cooled and can be dealt with by small-scale equipment modification, which is economically advantageous.

[Brief description of the drawings]

FIG. 1 is a layout diagram showing an example of a cooling device of the present invention, which is shown together with a block diagram of a piping system.

FIG. 2 is a layout diagram showing an example of a conventional cooling device, which is shown together with a block diagram of a piping system.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Chute 2 Conveyor 3 Sinter 4 Exhaust heat recovery zone hood 5 Non-exhaust heat recovery zone hood 6 Partition plate 7 Heat exchanger 8 External air intake 9 Circulation fan 10 Circulation pipe 11 Branch pipe 12 Damper 13 Dust collector 14 Exhaust fan 15 Discharge Cylinder 16 exhaust fan

Claims (1)

[Claims] 1. A cooling device for a sintered ore discharged from a sintering machine and then hot crushed, wherein the waste heat recovery zone hood covers the sinter ore placed and moving on a conveyor from above. A heat exchanger for collecting the exhaust heat of the hot air collected from the exhaust heat recovery zone hood, and a circulation fan for circulating the hot air after the exhaust heat recovery to the lower side of the sintered ore under the exhaust heat recovery zone hood. A circulating pipe provided with a circulating pipe, an outside air suction port for sucking outside air into the circulating pipe and mixing with the hot air after the exhaust heat recovery, and branching the circulating pipe to send a cooling gas in the circulating pipe to an exhaust pipe. A cooling device for a sintered ore, comprising: a branch pipe to be supplied; and a damper disposed in the branch pipe.