KR20010056253A - Method and apparatus for manufacturing sintered ore - Google Patents

Abstract

PURPOSE: A method for manufacturing sintered ore is provided to improve quality and recovery ratio of the sintered ore by spraying a certain amount of precipitation coke on the upper ore so as to bond sintered ore of the upper ore generated in the sintering process like a sintered cake by distributing the ore the sintered ore in the complete calcining state. CONSTITUTION: In a method for manufacturing sintered ore comprising a charging step of charging upper ore on a sintering transfer car transferring on an endless track; a fuel supplying step of supplying fuel to the upper ore; a blended raw material supplying step of supplying a blended raw material for sintered ore on the fuel supplied upper ore; and an igniting step of igniting the blended raw material, the fuel supplying step comprises the steps of detecting a temperature of the sintering transfer car; controlling a layer thickness of the upper ore according to a temperature of the detected sintering transfer car; and calculating a feed amount of the fuel according to the layer thickness of the upper ore and the transferring speed of the sintering transfer car so that the supplied amount of the calculated fuel is supplied to the upper ore. The apparatus further comprises a fuel supplying means for supplying a fuel to upper ore charged in the sintering transfer car; a temperature detecting means for detecting a temperature of the sintering transfer car; and a control means for controlling the supplying amount of a fuel supplied from the fuel supplying means according to the temperature signal transmitted from the temperature detecting means.

Description

Method and apparatus for manufacturing sintered ore {Method and apparatus for manufacturing sintered ore}

The present invention relates to a method for producing sintered ore used as blast furnace raw material, and in particular, to manufacture a sintered ore for reducing the fraction of the top sintered ore used for preventing the leakage of charged raw materials on the sintered trolley during the sintered ore to be unbaked. It is about a method.

In general, the sintering operation is a pretreatment process of the blast furnace raw material for easily preparing the spectral stones difficult to use in the blast furnace, blast furnace operation. That is, as shown in FIG. 1, the compounding material 8 in which a certain amount of co-feedstock and coke are mixed in powdered iron ore or spectroscopy is charged onto the sintering truck of the sintering machine 11, and the surface layer portion of the charged compounding material is loaded. After ignition in an ignition furnace, the main air blower 13 is used to suck air into the wind box 12 at the bottom of the sinterer, thereby raising the temperature to about 1300 ° C. through the combustion of coke, which is a fuel, between iron ore particles. A sintered compact 11A having a strong bonding force is produced.

At this time, in order to easily perform suction of the air blower 13, great bars (not shown) are provided in parallel in the sintering trolley of the sintering machine 11 at intervals of about 8 mm. However, since the particle size of the blended raw material 8 is about 2.5 mm on average, when the blended raw material 8 is directly loaded onto the sintered trolley, the blended raw material 8 leaks between the great bars, so that about 10 mm is prevented. The ore having a particle size of about 15 mm is partially recovered from the sintered ore and charged into the upper light 9 as a top light 9 on the sintered trolley to a thickness of about 40 mm to 70 mm, and then the compounding material is charged thereon.

Here, although the coke is mixed in the blended raw material 8, the upper light 9 charged at the bottom of the great bar is purely iron ore, so the blended raw material 8 becomes the sintered body 11 and is distributed, but the upper light ( 9) is not fired, but rather is differentiated during transport due to thermal differentiation (11B) due to red light, thereby deteriorating the quality of the sintered ore or lowering the recovery rate.

For example, Table 1 below shows the relationship between the recovery rate and the fraction of the sintered ore after the top light layer.

<Table 1>

After the upper light layer mm 40 50 60 70 Recovery rate % 84.0 83.2 82.0 80.5 Fraction % 28.0 28.9 30.2 33.4

That is, it can be seen from Table 1 that the fraction of the top light layer and the sintered ore is lower than that of the top light 9 to produce high quality sintered ore. However, when the layer thickness of the upper light 9 is low, a problem arises in that generation of fused light increases in the sintering machine.

In order to solve this problem, according to the conventional embodiment, the charging height of the upper light is kept low or the particle size of the coke mixed with the blending raw material 8 is set large, and the addition of the coke is excessively compounded so that the sintering machine 11 The concentration of coke in the blended material was concentrated downward to induce the bonding of the upper light by the heat of calcination generated during baking of the blended raw material.

However, in this conventional embodiment, the coke of the coarse raw material in the coarse raw material is combusted in the bottom of the coarse raw material, resulting in fusion of the bar, the coke is concentrated on the lower portion of the raw material of the blending material relatively the upper portion of the blended raw material The quality of the sintered ore deteriorates due to the lack of heat source, and the excessive mixing of the coke leads to an increase in the caloric unit, and also the use of the upper light in order to reduce the unsettling of the upper light. The problem is that the life of the bar is shortened.

In order to solve the conventional problems as described above, the present invention by spraying a predetermined amount of precipitation coke on top of the upper light to distribute the sintered ore of the upper light generated in the sintering process to a completely fired state and defects like sintered cake It is an object of the present invention to provide a sintered ore manufacturing method capable of improving recovery as well as quality.

In order to achieve the above object, the sintered ore manufacturing method according to the present invention includes a charging step of charging the upper light on the sintered bogie moving on the track, and a fuel supply step of supplying fuel to the upper light, and the fuel is supplied A compounding raw material supplying step of supplying a compounding material for sintered ore to the upper deposit, and an ignition step of igniting the compounding material, wherein the fuel supplying step includes detecting a temperature of the sintering bogie and a temperature of the detected sintering bogie. And adjusting the post-layer layer of the upper light, and calculating the supply amount of the fuel according to the post-layer layer of the upper light and the transfer speed of the sintering cart.

According to an embodiment of the present invention, the sintered ore manufacturing apparatus supplies an upper light charging means for charging the upper light on the sintered trolley moving on the track, and the raw material for sintered ore on the upper light charged in the sintered trolley And a ignition means for igniting the blended material, the fuel supply means for supplying fuel to the upper light charged in the sintered bogie and the temperature sensing for sensing the temperature of the sintered bogie. It further comprises a means.

1 is a view schematically showing a general sintered ore manufacturing apparatus.

2 is a view showing a compound material charging portion of the sintered ore manufacturing apparatus according to an embodiment of the present invention.

3 is a flow chart showing a sintered ore manufacturing process according to an embodiment of the present invention.

<Description of Symbols for Major Parts of Drawings>

9B: Upper light layer post-adjustment device

10: sediment coke cutting feeder

10A: Settling Coke Hopper

17: Worm Gear

18: control box

19: infrared sensor

Hereinafter, a preferred embodiment of the present invention with reference to the accompanying drawings as follows, the same configuration adopts the same reference numerals.

According to an embodiment of the present invention, in order to produce a sintered ore, a predetermined amount of precipitated coke is sprayed on top of the upper light 9. This precipitated coke serves as a heat source for burning the upper light. Then, the upper sintered ore generated in the sintering process is light-distributed in a completely calcined state to be bonded like a sintered cake.

That is, as shown in Figure 2, after the layer of the upper light (9) and the speed of the sintering machine 11 is transmitted from the control box 18 to calculate the amount of cut out of the precipitation coke (10) after the precipitation coke storage The settling coke 10 is cut out from the box. At this time, the temperature sensor generated by detecting the glowing state of the balance of the sintering machine 11 by the red sensor 19 mounted to the charging end of the sintering machine 11 is collected. The layer thickness of the upper light 9 is calculated using the temperature signal collected in this way. Subsequently, the layer box of the upper light 9 is adjusted by adjusting the post-layer adjusting device 9B by the control box.

Therefore, the iron ore, the subsidiary material and the coke are cut out, mixed, and granulated to produce the blended raw material 8 for the sintered ore. This compounding raw material 8 is transferred to the surge hopper 6 as an intermediate low light tank so as to be evenly charged in the sintering machine 11. The blended raw material lowered in the surge hopper 6 is charged on the sintering bogie of the sintering machine 11 at a constant thickness and a proper speed according to the drum rotation of the drum feeder 7.

At this time, in order to prevent the compounding material for sintering from leaking out between the intervals of the great bars installed in parallel with the sintering cart, the upper light is charged on the sintering cart and the compounding material is loaded thereon.

Meanwhile, referring to FIG. 2, an infrared temperature sensor 19 for sensing the temperature of the sintering machine 11 trolley before the upper light layer post-adjustment device 9B is installed so as not to interfere with the trolley progress. Reference numeral 18 denotes a control box, which receives a signal detected by the speed of the sintering machine 11 and the layer of the upper light 9 and the infrared temperature sensor 19 from the main controller (not shown). Adjust the coke cutout.

In addition, the sediment coke storage hopper 10A and the cutting feeder 10, which are capable of basis weight adjacent to the upper light layer post-adjustment device 9B, are installed, and the precipitated coke is discharged by the signal received from the control box 18. To cut out. That is, the control box 18 receives the temperature signal for the sintered cart and the speed of the sintered cart from the temperature sensor 19, and controls the worm gear 17 installed in the upper light layer post-adjustment device 9B to The amount of cutout of the settling coke is controlled by controlling the layer thickness of the light or by controlling the rotation speed of the cutout feeder of the settling coke storage hopper.

According to the present invention, the sintering machine 11 is operated so that the top light 9 is loaded on the sintering machine 11 bogie in the top light hopper and the precipitation coke 10 is sprayed on the top light as the sintering bogie proceeds. . At this time, the spreading amount of the settling coke 10 is controlled by the main controller of the sintering plant based on the sintering machine speed and the information after the layer of the upper light. Therefore, the control box controls the cutting feeder 10 so that a predetermined amount of settling coke is sprayed by the control signal from the main controller.

On the other hand, the spray amount of the settling coke is calculated by the following formula, for example.

Coke spreading rate (T / H) = L × 4 × S × 60 minutes × 1.8 × 0.02,

Where L is the upper light layer thickness (mm), 4 is the sintered trolley width (m), S is the sintering speed (m / min), 1.8 is the sintered ore specific gravity (T / m 2), and 0.02 is the use ratio. (%), And the use ratio (%) was applied to the blended raw material use standard 2%.

Thus, as the sintering machine continues, the compounding material 8 is charged again on it, and then ignition occurs in an ignition furnace (not shown) at the top of the raw material. Accordingly, the ignited blended raw material 8 burns the internal coke and is fired from the top to the bottom by the suction pressure of the main blower.

When the sintering machine 11 continues and the firing of the blended raw material 8 is completed, the precipitated coke 10 between the blended raw material 8 and the upper light 9 is burned to melt the upper light. At this time, the upper light 9 to be melted is distributed in a state combined with the fired sintered body (11A). Therefore, it is possible to prevent thermal differentiation of the upper light generated when the upper light is unbaked.

On the other hand, the balance of the sintering machine 11, the light distribution is completed is inverted to proceed to the light feeder again. At this time, the temperature signal detected by the red light sensor, for example, the infrared temperature sensor 19 installed at the charging end of the sintered trolley is transmitted to the control box 18, based on the temperature signal of the precipitation coke cutting feeder The amount of rotation of the settling coke is controlled by adjusting the number of revolutions.

For example, as shown in FIG. 3, when the temperature signal detected by the temperature sensor 19 indicates an excessive temperature deviation of a predetermined temperature or more, the amount of cutout of the settling coke 10 is controlled by controlling the rotation speed of the settling coke cutting feeder. On the contrary, if the temperature signal of the sintering machine causes a temperature deviation of a predetermined temperature, for example, -30 ° C. or more, immediately after 30 minutes due to the use of excess upper light 9, the upper light extraction gate 9B ), The amount of cutout of the upper light is reduced to adjust the thickness of the upper light layer to about -4mm / hr.

On the other hand, according to the present invention, it is possible to provide a sintered ore of the opposition to the blast furnace by the granular granularity of the upper light and to improve the utilization of the precipitated coke generated in the coke plant, it is possible to expect a cost reduction effect of a broader meaning, for example The cost reduction effect can be converted as follows.

The fraction is improved by -5.4%, the recovery rate of sintered ore is increased by + 3.5%, the sintered ore production effect is about 490 tons per day, and the coke raw unit can be estimated to be -1.7kg / T-S.

Therefore, according to the present invention, by controlling the continuous feed back to the optimum supply of the upper light and sediment coke consumption in accordance with the change in the operating conditions, it is possible to complete the firing of the upper light to improve the particle size of the sintered ore and improve the productivity of course The recovery rate of sintered ore can be increased.

The foregoing is merely illustrative of the preferred embodiments of the present invention and those skilled in the art to which the present invention pertains may make modifications and changes to the present invention without departing from the spirit and gist of the invention as set forth in the appended claims.

Claims (5)

A charging step of charging the upper light on the sintered trolley moving on the endless track, a fuel supply step of supplying fuel to the upper light, and a compound material supply step of supplying a compounding material for sintered ore to the upper light supplied with the fuel In the sintered ore manufacturing method consisting of a complexing step of complexing the blended raw material, The fuel supply step is to detect the temperature of the sintered cart; Adjusting the layer thickness of the upper light according to the temperature of the detected sintering cart, And calculating the cutting amount of the fuel in accordance with the after-layering of the upper light and the transfer speed of the sintered trolley, and supplying the calculated fuel supply amount to the upper light. The method of claim 1, wherein the amount of cutout of the fuel is reduced when the temperature of the sintered bogie is equal to or greater than the average temperature of the sintered bogie, and the layer thickness of the upper light is reduced when the temperature of the sintered bogie is below the average temperature of the sintered bogie. Sintered ore manufacturing method. The sintered ore manufacturing method according to claim 1 or 2, wherein the fuel is precipitated coke. Upper light charging means for charging the upper light on the sintered trolley moving on the endless track, compounding raw material supply means for supplying the compounding material for sintered ore on the upper light charged in the sintered trolley and the compounding material In the sintered ore manufacturing apparatus consisting of ignition means for Fuel supply means for supplying fuel to the upper light charged in the sintering cart; Temperature sensing means for sensing a temperature of the sintered trolley; And a control means for adjusting the supply amount of the fuel supplied from the fuel supply means according to the temperature signal transmitted from the temperature sensing means. The sintered ore manufacturing apparatus according to claim 4, wherein the control means reduces the layer thickness of the upper light when the temperature of the sintered trolley is lower than the average temperature of the sintered trolley.