JPS5925011B2 - Sinter cooling equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a sintered ore cooling equipment that can efficiently recover heat and improve yield.

Conventionally, as a sintered ore cooler, a so-called ventilated circular cooler has been used, in which the sintered ore is lowered through a chute with a high head while being open to the atmosphere, and cooled by a rotationally driven cooler.

The cooling equipment using the ventilation circular cooler will be explained with reference to FIG. 1.

In the figure, 1 is a pallet of a sintering machine that conveys sintered ore 2 fired with a burner or the like, and an ore discharge section 3 that discharges sintered ore 2 from the pallet 1 is used to crush the sintered ore 2. A crusher 4 is provided.

A hot screen 5 for sieving the sintered ore 2 is disposed at the lower end of the ore discharge section 3, and the hot screen 5
From there, the sintered ore 2 is lowered through a chute 6 and guided to a circular cooler 7.

A wind box 8 is attached to the lower surface of the circular cooler 7, and a blower 9 is attached to the wind box 8 to supply cooling air to the circular cooler 7, and the cooled gas is discharged from the chimney 10 into the atmosphere. It is designed to be discharged.

The sintered ore after cooling is discharged from a discharge port 11 and falls onto a belt conveyor 12.

A pallet 1 of a sintering machine filled with fired sintered ore 2 moves in the direction of the arrow and is reversed at an ore discharge section 3.

By this reversal, the sintered ore 2 is discharged from the pallet 1 by gravity, then crushed by a crusher 4, fine particles are sieved by a hot screen 5, and then collected on a pallet in a circular cooler 7 via a chute 6. Performs rotational movement together with the pallet.

Also, during this rotational movement, cooling gas is supplied from the blower 9 through the wind box 8, and this supplied cooling gas passes through the pallet of the circular cooler 7, during which time the sintered ore is cooled, and the sintered ore is combined with the sintered ore. The cooling gas that has undergone heat exchange is sent to the chimney 10.
The sintered ore is dissipated into the atmosphere, and the sintered ore thus cooled during one revolution falls from the discharge port 11 onto the belt conveyor 12 and is conveyed.

In the cooling equipment, the pallet 1 of the sintering machine is G,
The circular cooler 7 is located at a height of 2077Z on L, and the circular cooler 7 is located on G and L, and the sintered ore descends down the chute 6 and is discharged onto the circular cooler 7 with the height difference open to the atmosphere. It has become so.

In this way, the path of the sintered ore from the sintering machine to the ventilation circular cooler is almost the same even if different coolers are used.

However, the above cooling equipment has the following problems.

(1) It is not possible to efficiently recover heat and use it effectively.

(11) Collision and impact caused by dropping charging from a high place cause grain refinement of the sintered ore, resulting in a decrease in yield.

(Dust tends to get clogged in the cooling gas supply passage from the blower.

(IV) Requires dust pollution control equipment.

(■) A large capacity blower must be used.

The present invention has been made to solve the above-mentioned problems of the conventional means. A bifurcated discharge chute equipped with an outflow direction changing gate and a damper is provided at a lower part of a crusher of a sintering machine, and the discharge chute is and a charging hopper of a countercurrent moving bed cooling device, an inclined hoisting transport device is disposed between the charging hopper and the cooling device, and the charging hopper and the cooling device are communicated through a plurality of charging ports. That is.

Embodiments of the present invention will be described below with reference to the drawings.

A sintering machine 24 equipped with a pallet 23 for transporting sintered ore 22 is mounted on a suitable stand 21 erected on the GL, and an ore discharge section 25 of the sintering machine 24 has a , a discharge chute 27 equipped with a crusher 26 is provided.

In front of the discharge chute 27, a transport device 28, such as a skip hoist, is disposed in an inclined manner so as to be able to supply the sintered ore 22 to a charging hopper 29 of the cooling equipment.

That is, a charging hopper 29 whose inside is lined with a lining made of refractory brick or the like is installed below the top of the transport device 28, and a lid attachment device (not shown) is installed at the top of the charging hopper 29. ) so that the lid can be opened and closed quickly when charging sintered ore.

At the bottom of the charging hopper 29, a plurality of (for example, four,
A charging port 30 (such as 5) is provided, and the charging port 30
The lower part of the cooling device 31a communicates with the inside of the cooling chamber 32 in the cooling device main body 31 of the cooling device 31a.

The reason why the plurality of charging ports 30 are provided is to enable continuous charging in a filled state, and to allow the sintered ore 222 in the cooling chamber 32 to be charged continuously.
This is to make the level as uniform as possible, and to distribute the charged sintered ore large and small lumps as evenly as possible. This is essential in order to prevent variations in gas permeability as much as possible and to achieve uniform cooling.

The cooling device main body 31 is lined with a lining made of firebrick or the like to prevent heat loss as much as possible.
Further, a gas blowing port 33 is attached to the lower side of the cooling device main body 31, and the gas blowing port 33 is connected to a cooling gas blowing device 34 provided at a lower portion inside the cooling device main body 31.

The cooling gas blowing device 34 is not limited to the one shown in the drawings, but any conventionally known suitable device can be used.

In the cooling chamber 32, a counter-current moving layer is formed of sintered ore, and a plurality of discharge ducts 36 are installed at the upper part of the cooling device main body 31 to communicate with the cooling chamber space 35. These discharge ducts 36 are connected to a circular annular pipe 37.

The annular pipe 37 is connected to a heat recovery boiler (not shown) via a duct 38.

In addition, the height of the countercurrent movement layer of sintered ore is determined so that the cooling chamber space 35 has approximately atmospheric pressure. This is to discharge it from the body.

Furthermore, since the flow rate of the gas discharged from the discharge duct 36 is considered to be larger on the side closer to the duct 38, dampers 39 are provided for each side, so that the flow rate of the discharged gas can be adjusted.

A cutting and discharging device is provided below the cooling device main body 31.

That is, at the bottom of the cooling device main body 31, there is a primary hotspot.
40 is fixed thereto, and a pair of opposing cutout gates 41 are provided in the middle of the next hopper 40 so as to be slidable in the horizontal direction.

A seal valve 42 is provided at the lower end of the second hover 40 so as to be able to open and close vertically with respect to the pin pivot point.

A secondary hopper 43 serving as a charging hopper is installed below the secondary hopper 40, and a feeder 44 is installed at the bottom of the secondary hopper 43 to continuously transport cooled sintered ore onto a belt. It is formed so that it can be cut into a conveying device 45 such as a conveyor.

Also, when cutting sintered ore, the sintered ore is always in the primary hot spring.
40 and the secondary hopper 43 are filled.

If the seal valve 42 is opened, there is a risk that the cooling gas will leak outside, so in order to prevent this, the primary hopper 40 is closed.
The level of the sintered ore from the upper part of the secondary hopper 43 to the lower end of the secondary hopper 43 is made approximately the same as the level of the sintered ore in the cooling chamber 32, and the outlet of the sintered ore from the secondary hopper 43 to the feeder 44 is Keep it as small as possible.

This is done by maintaining the pressure in the cooling chamber space 35 at approximately atmospheric pressure, and also by maintaining the pressure at the discharge port of the secondary hopper 43 at atmospheric pressure, so that the pressure loss in the cut and discharge portion is reduced by the pressure loss in the cooling chamber 32. This is to make the leakage amount of the cooling gas at the discharge port portion and the amount of cooling gas flowing in the cooling chamber 32 equal to the ratio of the cross-sectional area of the discharge port and the cross-sectional area of the cooling chamber.

A seal box 46 is provided at the discharge port, and the pressure inside the seal box 46 is controlled to be approximately the same as the pressure in the cooling chamber interior space 35 to prevent leakage of the cooling gas.

For this purpose, a pressure sensor may be attached to the seal box 46, a gas supply pipe and a gas discharge pipe may be connected, and a flow rate control valve may be installed.

Other measures to prevent leakage of cooling gas include:
In order to make the pressure in the seal box 46 the same as the pressure in the cooling chamber space 35, the pressure in the cooling chamber space 35 is detected and compared with the pressure in the seal box 46. Means for adjusting the flow control valve of the discharge pipe may be employed.

Next, the operation of the present invention will be explained.

By reversing the pants 1230 of the sintering machine 24, the pallet 23
The sintered ore 22 inside falls under its own weight, is crushed by a crusher 26, and is charged into a transport device 28 from a discharge chute 2γ, transported by the transport device 28, and charged into a charging hopper 29 from the top thereof.

The charged sintered ore 22 passes through the charging port 30 and enters the cooling chamber 32.
By descending into the interior and riding on a countercurrently moving bed made of sintered ore, and opening the cutout gate 41 and seal valve 42 at the bottom, the countercurrently moving bed is successively moved downward by gravity.

Since a plurality of charging ports 30 are provided, the sintered ore can be continuously charged in a filled state, and the level of the countercurrent moving bed can be maintained approximately evenly. The particle size distribution of the small agglomerates can also be made approximately uniform.

On the other hand, the cooling gas is supplied into the cooling chamber 32 through the cooling gas blowing device 34 from the gas blowing port 33, spreads uniformly over the cross section of the cooling chamber 32, and causes the sintered ore 22 to descend continuously due to gravity. The gas rises while being cooled, becomes a high-temperature gas, reaches the cooling chamber space 35, passes through an annular pipe 37 from a discharge duct 36, is sucked into a duct 38, and is sent from the duct 38 to an exhaust heat recovery boiler (not shown). It gives heat to the boiler, returns to the gas inlet 33 as a cooling gas, and is supplied into the cooling chamber 32.

The sintered ore is cooled by the cooling gas while being lowered by gravity, and the seal valve 41 is opened and the sintered ore is cut out.
By alternately operating the hopper 40 and the secondary hopper 43, the material is discharged onto a feeder 44, and from the feeder 44 it is supplied onto a conveying device 45 where it is continuously conveyed to the next process.

Since the heights of the primary hopper 40 and the secondary hopper 43 are appropriately set to appropriately control the pressure inside the cooling device 31a, the amount of leakage of cooling gas can be kept to a small amount. It is possible to almost prevent leakage.

3 and 4 show another embodiment of the present invention, which differs from the previous embodiment in that the discharge chute 27 is bifurcated and an outflow direction changing gate 47 is provided at the intersection of the discharge chute 27.
, so that the sintered ore that is continuously sent to either of the two cooling devices can be alternately charged.

With such a configuration, even if sintered ore is continuously sent from the sintering machine, there will be no problem with the side pipe, and one cooling device can be used as a backup, and the outflow direction changing gate 47
By providing the gate 47 and switching the gate 47, it is possible to continue heat recovery.

In the figure, reference numeral 48 denotes a diper, which is used to temporarily store sintered ore to be introduced into the transportation equipment in the discharge chute 27.

When the discharge chute 27 is bifurcated, one of the cooling devices shown in the conventional example shown in FIG. 1 can be used as a backup.

FIG. 5 shows still another embodiment of the present invention, in which a hot screen 49 is provided between the discharge chute and the transport equipment.

In this way, the sintered ore from which fine grains have been removed is transferred to the cooling device 31.
It can be charged into the charging hopper 29 of (a), which improves the ventilation inside the cooling chamber, reduces pressure loss, and reduces the power of the cooling gas supply blower.

This is the bifurcated discharge chute 2 shown in Figures 3 and 4.
7 can also be used.

In the figure, the numbers shown in FIG. 2 indicate the same parts.

Note that the present invention is not limited to the above-mentioned embodiments,
It goes without saying that any transportation equipment can be used as long as it is capable of transporting sintered ore, and that various other changes can be made without departing from the gist of the present invention.

Since the sintered ore cooling equipment of the present invention has the above-described configuration, it can achieve various excellent effects as described below.

(I) The sintered ore discharged from the sintering machine can be fed into a cooling device for heat recovery in one operation.

(II) Since the time and number of handling of the sintered ore is reduced, the yield due to pulverization can be improved.

Because the transport route is short, heat loss is small and heat recovery efficiency is high.

(5) Since the charging hopper and the cooling device are connected through multiple charging ports, the level of the sinter charged from the charging hopper into the cooling device is uniform, and the level of the charged sinter is uniform. Large and small concretions are evenly distributed.

Therefore, variations in the permeability of the cooling gas are prevented, and the sintered ore can be uniformly cooled.

[Brief explanation of drawings]

Fig. 1 is an explanatory diagram of a conventional sintered ore cooling equipment, Fig. 2 is an explanatory diagram of an embodiment of the sintered ore cooling equipment of the present invention, and Fig. 3 is an explanatory diagram of another embodiment of the sintered ore cooling equipment of the present invention. An explanatory diagram showing an example in which the chute is bifurcated, Fig. 4 is a side view of Fig. 3, and Fig. 5 is a side view of Fig. 3.
The figure shows yet another embodiment of the present invention, and is an explanatory diagram of one in which a hot screen is used. 24 is a sintering machine, 26 is a crusher, 27 is a discharge chute, 28 is a transport device, 29 is a charging hopper, 31a is a cooling device, 33 is a gas inlet, 37 is an annular pipe, 40 is a primary hopper, and 143 is a secondary Next hopper, 45 is a conveyance device, 49
indicates a hot screen.

Claims (1)

[Claims] 1. A bifurcated discharge chute equipped with an outflow direction changing gate and a damper is provided at the lower part of the crusher of the sintering machine,
An inclined hoisting transport device is disposed between the discharge chute and a charging hopper of a countercurrent moving bed type cooling device, and a plurality of charging ports communicate between the charging hopper and the cooling device. A sintered ore cooling equipment characterized by: