JPS584918Y2 - Sintered ore cooling equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a cooling device for cooling sintered ore that has been sintered by a sintering machine and then crushed by a crusher.

The conventionally known cooling force formula for sintered ore will be explained based on FIG. 1.

1. In the sintering machine 1, fine ore is mixed with coke grains,
Sintered ore 4 is continuously supplied onto the grate truck 3 by the raw material supply device 2, and the sintered ore 4 is formed by the continuous movement of the grate truck 3 in the direction of arrow A.

At the discharge end of this sinter zone 4, sintered ore is produced at a temperature of about 800 to 1000°C.

Next, this high-temperature sintered ore is conveniently crushed and cooled by a hot crusher 5 (-Turn it into lumps, and then crush the crushed sintered ore onto a vibrating hot sintered ore powder screen 6. The fine grains are removed, and coarse grains of approximately 5 to 10 m5 or more are sent to the cooler 7.
I will be sent to

This removal of fine particles not only reduces ventilation resistance within the cooling device 7 and dust generation outside the cooling device 7, but also returns the removed fine particles to the sintering machine 1 for reuse, thereby improving sintering performance. It is a struggle to improve.

However, there are disadvantages in that a large amount of dust is generated during the operation of the screen 6, and there is considerable wear and tear on the screen 6 and the device for returning and transporting fine particles.

Further, the cooling device 7 shown in FIG. 1 is a linear transfer type three-stage induced ventilation type, and the cooling ventilation by the ventilation fan 9 to the sintered layer 4a□ on the conveying device 8 is carried out by the performance of the sintered layer 4a. Since this is carried out in direction C perpendicular to direction B, the amount of air used is large and the discharge temperature is low, with temperature differences depending on the discharge point.

In other words, in the case shown, the total air volume is approximately 2200 to 250 ON
Door'/t - With sintered ore, the discharge temperature from the first chimney 10 is 200 to 250 °C, and the discharge temperature from the second chimney 11 is 1
20~180℃, exhaust temperature from the third chimney 12 is 60~
ioo°C.

Even if the thickness of the sintered layer 4a in the ventilation direction C is set to 1, the air volume is 1.
800 to 220 ONm”/t - Sintered ore, the maximum temperature of approximately 1/4 to 115 of the ventilation amount is 350 to 450℃
The average temperature of the rest is about 200°C or less.

With this amount of recovered heat, reuse is not very effective.

In the case of the cooling device 7 of the case/octopus type, the air inflow/outflow area is large, and it has the disadvantage that it is difficult to prevent air leakage, dust generation, and recovery.

Furthermore, there is also a cooling power system for sintered ore as shown in FIG.

The cooling device 13 in this system is in the form of a vertical furnace, and the hot sintered ore is introduced from the upper blade and is cooled by cooling air blowing upward from the bottom while descending by gravity.

According to this method, the ventilation opening can be made much smaller than the conventional method shown in FIG. 1, so there is less air leakage.

However, in order to equalize the ventilation resistance within the cooling device 13,
There is a limit to the size of the flow cross section (furnace diameter), and in order to achieve the required amount of heat exchange, the flow height (furnace height) must be increased.

For this reason, not only does ventilation resistance increase, but the upper end of the conveying device 14 for the sintered layer 4b must be extended by the upper tube of the cooling device 113, which increases the length and complicates the structure. becomes.

Moreover, the heat dissipated into the atmosphere during transportation is large.

If the screen 6 shown in Fig. 1 is installed in N1 in the box octopus method, the transportation distance for inputting it to the cooling device 13 will be longer, which will not only be disadvantageous in terms of equipment and heat recovery, but also The amount of falling ore and dust generated during transportation of fine particles generated during inter-crushing increases, and the ventilation resistance increases due to the fine particles in the cooling device 13 (fine particles further increase due to the natural fall of sintered ore in the cooling device 13). do).

Maintenance and repair of equipment in high places is also difficult.

Therefore, the present invention provides a cooling device that solves these problems.

An embodiment of the present invention will be described below with reference to FIGS. 3 and 4.

That is, 20 is a cooling device according to the present invention, which is provided with a rotatable rotary drum 22 that receives the sintered ore crushed by the crusher 5 at an open end on the inlet side through a closed chute 21. A screen drum 23 is concentrically connected to the drum 22 at the outlet opening end of the screen drum 22, and an outlet side fixed housing 24 is provided to cover the screen drum 23. A fine ore discharge port 25 discharges fine grain ore that has sprung up, a coarse grain ore discharge port 26 that discharges coarse grain ore that has passed through the opening end on the exit side of the screen drum 23, and a cooling air supply port 27. and an inlet-side fixed housing 28 that covers the inlet-side open end of the rotary drum 22, and the inlet-side fixed housing 28 has air passing through the screen drum 23 and the rotary drum 22 from the cooling air supply port 27. A cooling air supply port 29 is formed to discharge the cooled air.

30 is a fine grain ore discharge port 2 inside the fixed housing 24 on the exit side.
5 side and the coarse grain ore discharge chamber 26 side, 31 is a rear cooler installed below the cooling device 20, and the cooling air sucked by the ventilator 33 through the hood 32 is Air is supplied into the outlet side fixed housing 24 through the air supply port 27.

In the above configuration, the fine grain-containing sintered ore discharged from the crusher 5 is transported by gravity to the casing 1 and the sealed chute 21.
It is thrown into the rotary drum 22 via.

Therefore, there is no heat release or dust generation at this time.

Since there is no special mechanical device in the housing, there is no need for maintenance and repair between the crusher 5 and the inlet side open end 1 of the rotating drum 22.

The sintered ore charged into the rotating drum 22 is agitated by the rotating drum 22 and sent in one direction as indicated by the arrow, and the sharp apex angle of the sintered ore is abraded by the 6 slips.

The sintered ore in the rotating drum 22 is sequentially transferred to the screen drum 23.
The fine-grained ore falls through the mesh of the screen, is discharged from the outlet 25, and is reused as hot return ore or (and) bedding ore.

The coarse ore falls from the opening end of the screen drum 23 on the exit side, is discharged from the discharge port 26, and is sent to the rear cooler 31.

The fine grain temperature in the screen drum 23 is about 200-25
Although the temperature is about 0°C, it can be cooled to about 100 to 150°C by increasing the residence time in the rotating drum 22.

Fine particles taken out at 200 to 250°C usually have good heat dissipation, and the temperature drops to below 200°C in a short time.

Therefore, by sprinkling a little water on the rubber conveyor, it can be transported without danger.

The temperature of the coarse grain ore discharged from the cooling device 20 can be kept at a minimum of about 100 degrees Celsius depending on the residence time, but since the rotating drum 22 is long,
℃, and thereafter cooling is performed by the rear cooling device 31.

As described above, according to the sintered ore cooling device of the present invention, the cooling section consists of a rotating drum and a screen drum, and the structure is significantly simpler than that of conventional devices, the heat load is 75 DJh, and the durability is excellent. .

Furthermore, since fine grain ore is separately collected by the screen drum, dust generation and ventilation resistance inhibition are also improved.

Furthermore, since this cooling device is of a closed type, the heat dissipated into the atmosphere is significantly smaller than that of the conventional cooling device.

Since the cooling air supplied to the sprout cooling device flows in the screen drum and rotating drum in the opposite direction to the conveying direction of the sintered ore, the contact time with the sintered ore is longer than in conventional devices, and heat recovery is improved. It has a high temperature and has great utility as air for sintering machines.

A rear cooler is installed that sends the cooling air that has passed through the shredded coarse particles into the fixed housing on the exit side, so it is possible to cool the coarse particles and preheat the cooling air at the same time.
Good thermal efficiency.

In addition, since the cooling air that has passed through the coarse-grain conveyor is sent into a fixed housing instead of being dissipated and stored in the housing, the amount of exhaust gas processed by the entire facility can be reduced. It is.

[Brief explanation of the drawing]

FIG. 1 and FIG. 2 are respectively schematic overall views showing the conventional apparatus of the present invention. 3 and 4 show an embodiment of the present invention, with FIG. 3 being a schematic overall view and FIG. 4 being a longitudinal sectional view of the main parts. 20...Cooling device, 21...Chute, 22...Rotating drum, 23...Screen drum, 24...Exit side fixed housing , 25... Fine grain ore outlet, 26...
Coarse grain ore discharge port, 27... Cooling air supply port, 28
...Inlet side fixed housing, 29...
Cooling cylinder air outlet.

Claims (1)

[Scope of utility model registration request] After the sintered ore has been sintered by the sintering machine (and crushed by the crusher), a rotatable drum is installed at the opening end of the inlet side to receive the sintered ore. A screen drum is connected in the form of a core, and an exit side fixed housing is provided to cover the screen drum.
A fine ore outlet for discharging the fine ore that has passed through the mesh of the screen drum, a coarse ore outlet for discharging the fine ore that has passed through the opening end of the screen drum on the exit side, and cooling air. An inlet side fixed housing is provided in the form of a supply port and covers the inlet side opening end of the rotating drum, and the cooling air that has passed from the cooling air supply port through the screen drum and the rotating drum is provided in the inlet side fixed housing. A conveying device which forms a cooling air supply port for discharging the dusty air, receives and conveys the fine ore discharged from the fine ore discharge port, a hood that covers the conveying device, and a hood that covers the inside of the hood. A cooling air communication path that communicates with the cooling air supply port, and the cooling air that is interposed in the cooling air communication path and has passed through the coarse iron on the conveying device is transferred into the outlet side fixed housing through the cooling air communication path. A sintered ore cooling device characterized by being provided with a rear cooler having a ventilation fan for feeding the sintered ore.