JP2598418B2 - Sintering method and apparatus for sintering compounding raw materials - Google Patents

Description

The present invention relates to a sintering method for a sintering compound material, and in particular, at least 150 m from both sidewalls of a pallet in a central direction.
The present invention relates to a sintering method and apparatus for a sintering compound raw material, which can improve the quality of a sintered ore sintered in a portion ranging from a portion separated by more than m to 500 mm to the same quality as a central portion.

<Conventional technology and its problems> Conventionally, sintered ores have been manufactured by a sintering process as shown in FIG. That is, the primary compounding raw material A, the coke breeze B, the limestone C, and the auxiliary raw material D (the serpentine rock and the silica stone) are stored in the plural mixing tanks 1.
, Etc., and the primary blended raw material stored in each blending tank 1 is quantitatively cut out by a constant feeder 2 below the tank.
After being multi-layer compounded on the belt conveyor 2 ′, added with water, mixed and granulated in the mixer 3, it is stored in the feed hopper 4 as a secondary compounding material. Then, the secondary compounding raw material is charged into a pallet 8 on a sintering machine 7 via a feed hopper 4, a drum feeder 5, and a chute 6. Thereafter, the compounding material layer 11 charged in the pallet 8 is flattened by the cut gate 9,
After being ignited by the ignition furnace 10 on the carbon material on the surface of the blended material layer 11, the sintering reaction in the blended material layer 11 is continuously performed from the upper layer to the lower layer by suctioning downward by the main exhaust fan 12. This is a method in which the sintering reaction is completed in about 15 to 20 minutes and sinter is produced.

The quality of the sinter depends on the temperature rise and cooling pattern experienced by the blended raw materials during the sintering process.

However, the sintered ore in the vicinity of the pallet sidewall has a large air permeability at the contact surface between the compounding material and the wall from the initial stage of charging as compared with the center of the pallet width,
In the sintering process, a gap between the side wall and the end of the sinter occurs due to burning-in accompanied by shrinkage of the sinter, and excess air enters, and heat is radiated from the side wall. Since the sintered ore near the wall is sintered in a state of excessive ventilation, heat shortage occurs.

In this regard, focusing on the coke combustion heat in the width direction of the sintering machine pallet as shown in FIG. 4, the vicinity of the side wall has more heat dissipation from the side wall than the central portion, and the The amount of melt generated is small due to the lack of combustion heat enough to sufficiently melt the ore inside, so shutter strength like that of the sinter in the center cannot be obtained, which is one factor in the occurrence of returned ore .

As a measure taken to suppress the ventilation for the above-mentioned problem, there is a method of performing sintering by sprinkling return ore on a sintering raw material layer disclosed in Japanese Patent Application Laid-Open No. 48-11204. However, this method cannot solve the above-mentioned problem, and the suppression of the air flow for the above-mentioned method is not preferable because the air permeability of the whole sintering raw material is deteriorated.

Further, Japanese Patent Application Laid-Open No. 58-31040 is disclosed as a technique that simultaneously satisfies the above-mentioned problems. However, not only is the means for intervening return ore along the sidewall complicated, but also in actual operation. The life of the partition plate separating the returned ore and the sintering raw material is short, and maintenance is difficult.

<Means for Solving the Problems> The present invention solves the above-mentioned problems, prevents segregation of coke combustion heat in the width direction of the sintering machine pallet, and in particular, at least 150 m in the center direction from both sidewalls of the pallet.
The purpose is to improve the heat deficiency in the part from a distance of more than m to 500 mm from the part that is more than m apart, to perform uniform sintering of the sintering material layer in the width direction, and to reduce the amount of returned ore. is there.

The sintering method of the sintering compounded raw material of the present invention comprises a sintering carbon material addition device disposed above both ends of a sintering machine between a feed hopper and an ignition furnace in a pallet width direction. At least 150mm in the middle direction from the sidewall
It is characterized by sintering while additionally adding a sintering carbon material on the sintering blended raw material layer of the part from the distant part to 500 mm, and the sintering raw material addition device of the present invention A charcoal having a service tank with a built-in filter for separating carbonaceous materials at the upper part and a carbonaceous material supply hopper at the lower part, which are respectively disposed above both ends in the pallet width direction between the feeder hopper of the sintering machine and the ignition furnace. The material supply device is connected between the tank truck for transporting the carbon material and the above-mentioned service tank, and the pneumatic pipe having a shutoff valve on the way is connected between the service tank and the wind leg of the sintering machine, and is shut off on the way. An intake pipe having a valve, a shutoff valve disposed between the service tank and the carbonaceous material supply hopper, and a carbonaceous material cutting device disposed below the carbonaceous material supply hopper; Depending on the suction pressure of the main exhaust fan The carbonaceous material from the tank lorry vehicle is characterized in that become configured to receive the said service tank.

<Example> Next, an example of the present invention will be described with reference to the drawings.

FIG. 1 is an overall side view showing an embodiment of the present invention in which a sintering carbon material addition device 13 is disposed between a sintering machine feed hopper 4 and an ignition furnace 10, and FIG. 1 shows a cross-sectional view taken along the line AA of FIG. As shown in FIGS. 4 and 5, in order to improve the coke combustion heat in a portion extending from the portion at least 150 mm in the center direction from the sidewall to at least 500 mm from the side wall to the same extent as in the center portion, as shown in FIGS. Between the feeder hopper 4 and the ignition furnace 10 of the kneading machine, 5 to 10 kg / t
A sintering carbon material addition device 13 for adding s carbon material is provided.

In FIG. 4, the insufficient portion of the coke combustion heat is a hatched portion, and the value of A in FIG. 4 corresponds to 500 mm. Therefore, at least 150mm from the inner wall surface toward the center
Carbon material is added to compensate for the lack of heat in the part from the distant part to 500 mm. As shown in FIG. 4, heat is rapidly dissipated on the inner wall surface of the wall, but it is necessary to add carbonaceous material to at least a portion that is at least 150 mm away from the inner wall surface and reaches 500 mm. The reason is that, in the portion near the size wall road less than 150 mm, the heat deficiency hardly disappears even if the carbon material is added, and in the range exceeding 500 mm, the heat deficiency does not occur and the addition is unnecessary.

In addition, the addition amount is in the range of 5 to 10 kg / t · s, and 5 kg / t
・ If it is less than s, the amount of carbon material added is small and there is no effect.
If it exceeds 10 kg / t · s, there is a danger that the wall surface may be burned in some cases, and furthermore, there is an economic disadvantage associated with an increase in the basic unit of carbonaceous material. According to the present invention, the lack of heat in the hatched portion (excluding the portion less than 150 mm in the center direction from the inner wall surface of the wall) is eliminated, and sintering is performed uniformly in the width direction.

Meanwhile, as shown in FIG. 2, the addition device 13 includes a carbon material pneumatic pipe 16 for pneumatically transporting the carbon material in the tank truck 14 on the ground to the service tank 15, and a shutoff provided at a lower portion of the service tank 15. A rotary valve 19 for feeding a constant amount of carbon material is provided below the carbon material supply hopper 18 provided with a carbon material supply hopper 18 via a valve 17. further,
As a power source for pneumatically transporting the carbon material in the tank truck 14 on the ground, an intake pipe 20 connects the service tank 15 and the wind leg 21 so as to use the suction pressure of the main exhaust fan 12. . The carbon material pneumatic pipe 16 and the intake pipe
Switching valves 22 and 23 for switching are provided on 20, and a filter 24 for separating the carbon material is mounted in the service tank 15.

Next, a procedure for additionally adding a carbon material will be described.

First, -3 mm coke breeze and pulverized coal are generally used as the sintering carbon material. However, dust generation during handling is a problem, and the sintering carbon material is often brought into the tank truck 14 in many cases. The carbon material pneumatic pipe 16
When the shut-off valve 17 provided at the lower part of the service tank 15 is fully closed and the shut-off valve 23 of the intake pipe 20 and the shut-off valve 22 of the carbonaceous air feeding pipe 16 are fully opened, the intake negative pressure in the wind leg 21 is reduced. the _{(-1500~-1900mm H 2 O)} , the tank lorry vehicles 14
The carbonaceous material therein is led into the service tank 15 via the carbonaceous material feeding pipe 16 and separated and collected by the filter 24 provided in the service tank 15. When the entire amount of the carbon material in the tank truck 14 has been charged into the service tank 15, the shutoff valve 23 is fully closed, the shutoff valve 17 is fully opened, and the carbon material in the service tank 15 is supplied to the carbon material supply hopper 18. Be charged. The carbon material in the carbon material supply hopper 18 is cut out by a rotary valve 19, and an appropriate amount of carbon material is applied to the surface of the raw material in a range from the inner wall surface of the side wall 8 'of the pallet 8 at least 150mm in the center to 500mm. It is added one by one. By doing so, segregation of coke combustion heat in the width direction of the sintering machine pallet is prevented.

<Effects of the Invention> Segregation of coke combustion heat in the width direction of the pallet is prevented, and uniform sintering of the blended raw material is enabled. Therefore, the shutter strength of the sintered ore from the part at least 150 mm in the center direction away from the sidewall to 500 mm from the side wall, which has become a fragile sinter due to the lack of coke combustion heat and which has been one of the causes of the occurrence of ore return, It is possible to improve and reduce the amount of returned ore.

[Brief description of the drawings]

1 is an overall side view showing an embodiment of the present invention, FIG. 2 is a sectional view taken along the line AA of FIG. 1, FIG. 3 is an overall side view showing a conventional example, and FIG. 3 is a graph showing a coke combustion heat distribution of FIG. DESCRIPTION OF SYMBOLS 1 ... Mixing tank, 3 ... Mixer, 4 ... Mining hopper, 7 ... Sintering machine, 8 ... Pallet, 9 ... Cut gate, 10 ... Ignition furnace, 11 ... Mixing raw material layer, 12 … Main exhaust fan, 13… Carbon material addition device for sintering, 14 …… Tank truck, 15… Service tank, 16 …… Carbon air supply pipe, 18 …… Carbon supply hopper, 19… Rotary Valve, 20 ... intake pipe, 21 ... wind leg, 22, 23 ... shut-off valve.

Claims (2)

(57) [Claims] 1. A sintering carbon material adding device disposed above both ends of a pallet width direction between a feeder hopper and an ignition furnace of a sintering machine. A sintering method for a sintering mixture raw material, characterized in that sintering is performed while additionally adding a carbon material for sintering to a portion of the sintering mixture raw material layer extending from the above-mentioned separated portion to 500 mm. 2. A service tank, which is disposed above both ends in the pallet width direction between a feed hopper and an ignition furnace of a sintering machine, has a built-in filter for separating carbon material, and supplies carbon material to a lower portion. A sintering carbonaceous material supply device having a hopper, a carbonaceous material pneumatic pipe having a shutoff valve on the way connecting a tanker truck for carbonaceous material transportation with the service tank, a service tank and a sintering machine wind leg An intake pipe connecting between them and having a shut-off valve on the way, a shut-off valve arranged between the service tank and the carbonaceous material supply hopper, and a carbonaceous material cutting device arranged below the carbonaceous material supply hopper. A sintering compound raw material adding apparatus, wherein carbon material is received from the tank truck into the service tank by suction pressure of a main exhaust fan of the sintering machine.