KR20030049455A - An apparatus for screening hearth layer and materials of sintering machine - Google Patents

Abstract

PURPOSE: An apparatus for charging hearth layer ore and raw materials into sintering machine is provided to improve sinter recovery ratio by charging the sorted return fines in uniformed layer after sorting return fines using a variable screen so that coarse sinter is positioned in the lower layer, and fine sinter is positioned in the upper layer. CONSTITUTION: The apparatus comprises an air ejection part(102) for removing fine powder having a small grain size in return fines dropped from hearth layer ore hopper at the lower side of the hearth layer ore hopper by air ejection; a variable screen(105) a wire mesh of which is sized differently in such a way that the powder removed return fines having smaller to larger grain sizes are screened as it goes from the upper part to the lower part of the screen, and a mounting angle of which is adjusted by screen hoister; and a multi-step chute(107) integrally mounted on the lower part of the screen(105) to charge return fines screened per grain sizes by the screen(105) onto the bottom surface of pallet(117) in uniformed layer shape in the order of larger to smaller grains so that fine grained return fines are used as the hearth layer ore by screening the return fines per sizes, thereby charging large sinter onto the bottom surface of the pallet(117) in such a way that grain size of the return fines is getting smaller as it goes from the lower side to the upper side of the pallet(117).

Description

Sintering machine top light and raw material charging device {AN APPARATUS FOR SCREENING HEARTH LAYER AND MATERIALS OF SINTERING MACHINE}

The present invention relates to a device for charging the upper light on the trolley of the sintering machine charging unit, and more particularly, in order to utilize the semi-reflective light generated in the screening process after the sintering ore manufacturing as the upper light of the sintering machine It is related with the sintering machine upper light and the raw material charging device which dramatically increases productivity by improving the sintered light recovery rate by classifying the particle size so as to be located in the lower layer and the small particle in the upper layer and charging the particles into a uniform layer.

In general, the sintering process refers to a series of processes for producing hardened sintered ore by firing iron ore and secondary raw materials in powder state. In this sintering operation, as shown in FIG. 1, the upper light hopper 110 is positioned at the lower side of the upper light bath chute 115 to charge the upper light 118 on the trolley 117, and to the rear side thereof. The blended raw material hopper 119 is positioned to charge the blended raw material 116 on the upper light 118 of the sintered cart 117 through the drum feeder 112 and the charging plate 113. Then, the sintered trolley 117 is ignited while passing through the ignition furnace 114, so that various types of spectroscopy and powdered coke are mixed and charged into the sintering machine trolley 117, and the surface portion of the sintering furnace 114 is The mixed raw material, which is finely divided ore, is melted and produced by sintered ore by the heat generated when the powder is ignited and the coke is burned down by forced suction.

In the process of manufacturing the sintered ore, the granulated raw materials charged to the sintering machine trolley are prevented from being lost during the suction suction downward, and the suction bar great bar and the bar for improving air permeability and preventing fusion of the trolley great bar and the sintered cake. The upper light of the appropriate height is loaded between the blended raw materials.

This sintering operation is an important factor in determining the air permeability and plastic strength in the bed by the degree of grain size (vertical segregation) of the blended raw material to be granulated through the inclined sheet plate, which determines the productivity of the bed do.

Conventionally, in the upper light storage hopper 110 as shown in FIG. 1, the upper light is charged to the upper portion of the sintering machine cart 117 at an appropriate height through the cutting device, which has the following problems.

First, by reloading the sintered ore with 8 ~ 13mm particle size, which is preferable to use in the blast furnace, as the top light, the recovery rate of sintered ore is greatly reduced, resulting in cost increase and productivity. The upper light charge amount is 50 ~ 70mm thick and occupies about 10% compared to the total charge amount 50 ~ 700mm.

Second, since there is no device for classifying the particle size when charging the upper light, large and small particles are mixed, so it is difficult to use it by lowering the particle size of the sintered ore for lower light or reducing the amount of charged light. When the particle size is lowered, sintered ore with small particle size is drawn out between the grate bars 126 forming the bogie bottom surface, which is attracted to the sintered flue gas facility, which not only affects the operation but also deepens the wear of the great bar 126. It causes problems that need to be replaced early.

On the other hand, if the charging amount is reduced, the problem that the upper light is attached to the bottom of the cart 117 during the sintering process occurs. Due to this cause, the sintered ore having a median particle size of 8 to 13 mm from the sintered ore managed particle size range of 5 to 50 mm cannot be charged into the blast furnace, and about 10% of the total amount of the sintered ore manufactured is reloaded into the sintering machine.

The present invention is to solve the above conventional problems, the purpose is to replace the sintered semi-reflected light to the upper light in the sintered top light charging process by classifying the sintered semi-light with a small particle size compared to the top light by the particle size from the lower layer It is to provide an improved sintering machine top light and raw material charging device to significantly improve the recovery rate of the sintered ore by charging the opposing, thereby increasing the productivity beyond the recovery rate improvement.

1 is a block diagram of a conventional sintering machine top light and raw material charging device;

2 is a side configuration diagram of the sintering machine top light and the raw material charging device according to the present invention;

3 is an external perspective view of the sintering machine upper light and the raw material charging device according to the present invention;

4 is a block diagram of a semi-lightness classifying variable screen equipped in the sintering machine upper light and the raw material charging device according to the present invention;

5 is an operational state diagram of a variable screen equipped in the sintering machine top light and the raw material charging device according to the present invention;

Figure 6 a), b) is a state diagram of the raw material loading state of the sintering machine before and after the present invention;

7 is a block diagram showing a pot (POT) sintering test apparatus for testing the operation effect of the sintering machine top light and the raw material charging device according to the present invention.

<Description of the symbols for the main parts of the drawings>

110 .... Side light hopper 111 .... Compound raw material hopper 112 .... Drum feeder

113 ..... Charge board 114 ..... 115 in firing furnace

116 ..... Blended material 117 ..... Balance 118 ....

119 ..... Screen traction machine 120 ..... Air spray nozzle 121 ....

123 .... cut off plate

125 ..... variable screen 125 ... screen mounting angle 126 .... Great bar

127 .....

In order to achieve the above object, the present invention, in the apparatus for charging the upper light on the trolley of the sintering machine charging unit, the fine powder of the small particle size of the sintered semi-reflected falling from the upper light hopper at the lower side of the upper light hopper An air injection unit to be removed by air injection; The variable size screen is formed to be different from the small particle size from the upper side to the lower side to remove the finely divided sintered semi-reflective, adjustable screen angle adjustable by the screen hoist; And, integrally mounted on the bottom of the screen A multi-stage chute that charges the sintered semi-reflected screens by particle size into a uniform layer from the bottom of the sintered trolley; By providing a sintered top light and a raw material charging device, characterized in that it is configured to be used as a top light sintered semi-granule of small grain size.

Hereinafter, the present invention will be described in detail with reference to the drawings.

1 is a granulation state diagram of the upper light and the blended raw material in the conventional sintering machine charging device,

2 is a state diagram of the sintered semi-reflective light and the compound material loading to which the variable screen 105 of the present invention is applied.

When the sintering machine upper light and the raw material charging device 100 according to the present invention is largely divided, the air spraying unit 102 for removing fine powder from the sintered semi-reflective light, and the sintered semi-fine powder from which the fine powder is removed are selected from small particles and the mounting angle is adjusted. This variable screen 105 is composed of a multi-stage chute 107 for charging a sintered semi-reflective screen selected by particle size to the sintered trolley 117 in a uniform layer form.

The air spraying unit 102 for removing fine powder from the sintered semi-reflective light is provided with an air spray nozzle 120 between the cutting device 122 and the variable screen 105 under the upper light hopper 110 to sinter semi-reflected light. Remove the fine powder less than about 2mm in 140. The air injection nozzle 120 is a slit type parallel to the sintering machine width direction, it is designed to control the injection direction, flow rate, pressure (flow rate) of the air. The fine powder separated by the injected air is sent to the rear end of the variable screen to be collected through a dust collector 121 such as a cyclone or a bag filter.

In addition, the present invention has a variable screen 105 that is capable of selecting the finely divided sintered semi-reflected light 140 from the smallest particle size and adjusting the mounting angle, wherein the screen 105 has a variable screen 105 as shown in FIG. The size of the pastoral 105a) is narrower at the top and is made wider toward the bottom.

That is, a certain section of the upper side of the screen 105 is the size of the pastoral tree 2 ~ 3mm, a certain section is the size of the pastoral 3 ~ 5mm, a certain section is the size of the pastoral 5 ~ 7mm.

The upper end of the variable screen 105 is rotatably connected to the lower axis (110a) of the upper light hopper so as to rotate the fixed height, the lower end is connected to the wire rope 142 to raise the vertical height of the screen hoist ( 119 to change the mounting angle θ of the screen 105 about the axis 110a.

The screen hoist 119 includes a winch 145 mounted on one side of the upper light hopper 110 and a wire rope 142 hooked to a pulley of the winch 145, and the wire rope 142 is The tip is connected to the bottom of the upper surface of the screen 105.

In addition, the multi-stage chute 107 for charging the sintered semi-reflected 140 sorted by the particle size to the sintered trolley 117 in a uniform layer form from the opposite to the sintered trolley 117 is located at the lower portion of the variable screen 105 is 3 to 4 At the end of each chute 107, a cut off plate 123 for adjusting the charging amount (charging height) of the upper light is mounted.

The chute 107 is mounted to the bottom of each of the pastoral size of the screen 105, that is, 2 to 3 mm section, 3 to 5 mm section, 5 to 7 mm section.

The device 1 of the present invention configured as described above is intended to replace the existing upper light with a fine particle size sintered semi-reflective 140.

The particle size of the existing upper light is 8 ~ 13mm, the interval between the great bar 24 of the upper sintered trolley 17 is 5mm, so that the upper light does not leak between the great bar 26. Since the particle size of the sintered reflector 140 is about 3 to 8 mm, it is inefficient to use it directly on the existing sintered trolley. Therefore, in order to use the sintered semi-reflective 140 as the upper light, the upper limit of the particle size of the semi-reflected 140 should be increased to 6-7 mm or the Great Bar interval of the bogie should be narrowed to less than 5 mm.

In addition, as shown in FIG. 6, the sintered light 140 may be classified by particle size to distribute oppositions at the bottom, and fine grains may be charged at the top to prevent the sintered light 140 from leaking between the great bars 126. If the sintered glow 140 leaks between the great bars 126, the sintering operation and equipment management are adversely affected. The reason for this is that when the sintering machine is operated, the air is strongly sucked from the lower portion of the bogie, and thus, without the mutual bonding force, the finely sintered granules 140 such as sand easily leak together with the air, and the leaked sintered granules 140 are the great bars 126. ) And rapid sintering of the sintered trolley components and increase the dust concentration in the suction gas, which leads to an increase in the load of the dust collector.

In order to prevent such a problem, the apparatus according to the present invention has a function as follows. First, the fine powder in the sintered semi-glossy 140 is removed by blowing air before passing through the screen 105.

To this end, the air injection nozzle 120 of the air injection unit 102 is designed to have a line shape long torn in the width direction so as to control the pressure, flow rate, and direction of the injection air, so that the undistributed component ratio in the semi-glossy 140 According to the moisture content, semi-glossy (140) is appropriately adjusted. The ultrafine sintered glow 140 separated by the dispersed air is collected by a dust collector 121 installed at the rear of the screen, mixed with a separate sintered raw material, and reused.

Second, the sintered semi-reflective 140 is forcibly classified by the variable screen 105, and layered charging is performed on the trolley 117 in the order of granularity by the multi-stage chute 107. That is, in the conventional sintering method, the undeveloped technique of using the sintered semi-140 as the upper light is that it is difficult to classify the upper light on the sintered cart 117 by particle size. Since the stacking height of the upper light is as thin as 50 ~ 70mm, it is not practical to classify the sintered ore with 8 ~ 13mm particle size and load it evenly in the layer direction in the sinter width direction of about 4m.

However, the present invention solves the problems in the prior art by using the variable screen 105 to classify the sintered light 140 having a finer particle size than the existing upper light by particle size, and layered charging using the multi-stage chute 107. It became possible. The variable screen 105 adjusts the distribution amount of the multi-stage chute 107 which is changed according to the particle size distribution of the sintered reflection 140 by appropriately adjusting the mounting angle θ.

That is, when the amount of fine grained sintered reflection 140 is insufficient, the mounting angle θ of the screen 105 is reduced (pressing the screen 105), and when the amount of fine grain is too large, the mounting angle is increased (the screen 105 is increased). ), The ratio of alleles and fine grains is adjusted to an appropriate amount. In the case of the opposite half light 140, the amount of distribution is adjusted when the opposite half light 140 is reversed.

In the case of using the finer sintered light 140 than the conventional upper light particle size as the upper light, the reason why the layered charge by particle size is advantageous is assuming that the upper light height is 50mm, the 10mm sintered light is 5 layers and the 4mm sintered light is about 12 layers. Because it can be stacked.

In addition, since the multi-stage chute 107 uniformly regulates the sintered semi-reflection 140 classified in the width direction in the width direction, it improves the layered loading function for each particle size. The cut-off plate 123 provided at the end of the multi-stage chute 107 allows the semi-glossy 140 classified in the multi-stage chute 107 to be charged in an appropriate amount for each particle size. A sensor (a grounding rod, an ultrasonic sensor, etc.) (not shown) capable of detecting the amount of sintered semi-reflective 140 charged in each multi-stage chute 107 is installed to automatically determine the height of the cutoff plate 123 with the measured data. You can also adjust.

Pot (POT) test results for the use of the sintered semi-liter 140 using the sintering machine top light and the raw material charging device 100 according to the present invention will be described below.

In order to confirm the effect of the present invention experimentally, the experiment using the sintered light 140 as an upper light using a sintered pot experimental apparatus was performed. 7 is a sintered photo experiment apparatus used for this, the pot diameter is 200mm, the height is 600mm. The raw material is a sintered compound raw material used in general integrated steelworks.

The air pressure suctioned from the lower part was 1,700 mmAq, the charged material density was 2.0 ± 0.05 g / cm 3, and the ignition furnace was ignited for 2 minutes while maintaining the temperature at 1,050 ° C.

The upper light was used by selecting 8 to 13 mm of sintered ore products conventionally used and 3 to 8 mm obtained by screen 105 of the sintered semi-reflective 140. The fine-grained sintered ore with the screen 105 of the sintered semi-glossy 140 was mixed and charged by particle size as shown in Table 1 to summarize the results.

At the time of charging by particle size, the sintered glare 140 was reselected to be suitable for the upper light-inlet powder by using the manual screen 105, and charged from the opposing to the upper light having a large particle size in the lower portion. The experiment was performed three times for each condition and averaged.

Table 1: Results of the pot test using sintered semi-light

How to use the upper light Conventional method Half-light mixing Semiglow Top light particle size (mm) 8 to 15 3 ~ 6 or less 6 or less 2nd floor (~ 4,4 ~ 6) 8 or less 3 layers (~ 4,4 ~ 6,6 ~ 8) Productivity (T / D / m ² ) 34.2 30.5 36.1 35.0 Sintering time 40.8 45.9 41.6 40.6 Recovery rate (+ 5mm,%) 73.2 74.7 77.2 76.4 Cold strength (SI,%) 91.2 92.8 91.5 92.2

In the pot test results shown in Table 1, the method using the semi-glossy 140 in a layered manner compared to the conventional method has the highest productivity. As described above, the productivity increase factor is a recovery rate of 2.9% compared to the conventional method. Although there is a problem that the sintering time is slightly increased, the increase in sintering time has the effect of improving the strength of the sintered ore, so the recovery rate is increased in proportion to the amount of replacing the top light of the existing sintered product with the sintered semi-glossy 140. Also matches. In the case where the sintered semi-reflected light 140 is not classified by particle size and mixed as the upper light, there is a problem in that the sintering time is increased and productivity is decreased.

The increase in sintering time is caused by the loss of the sintered semi-140 used as the top light between the great bars in the bottom of the pot is 5mm, the thickness of the top light is thin, similar to the gap between the great bars This is caused by the difficulty of suctioning air from the bottom of the port due to the phenomenon that the upper light of the particle size is caught.

Therefore, in order to use the fine-grained sintered semi-reflective 140 as the top light, the classification must be performed by particle size, and the charge must be carried out uniformly from the opposing layer.

As described above, according to the present invention, the fine powder of the sintered semi-reflective 140 is pre-removed by the wind, and forcedly classified by the particle size from the fine granules by the variable screen 105, and then uniform on the sintered ore bogie using the multi-stage chute 107 Since it is possible to accumulate in one layer, compared to the method of using a conventional sintered ore product as the top light, the productivity of the sintered ore recovery rate is dramatically improved. That is, compared to the conventional sintering method, since the amount of upper light used occupies about 10% of the amount of sintered raw material, the upper light of the sintered ore product may be replaced with the sintered semi-glossy 140, thereby improving recovery and productivity of up to 10%, respectively.

In addition, in the case where the particle size is reduced by using the sintered semi-reflective 140 as the upper light, the height can be lowered as compared with the conventional upper light having a large particle size, and thus the effect of increasing productivity can be expected. In addition, the conventional upper light, which is not used by the present invention, has an appropriate particle size and excellent quality in overall cold strength, reduction differentiation index, etc., and thus has an advantageous effect on improving yellowing when used in a blast furnace.

That is, the upper light particle size of the present invention has a differentiation phenomenon in the transfer process to an intermediate particle size of 5 to 50 mm, which is a sintered ore particle size range, and is less charged in the blast furnace and is less likely to be differentiated during the reduction process. In addition, since the particle size is not fine grains, the ventilation in the blast furnace is not deteriorated. In addition, the conventional top light is a sintered ore of the particle size preferred by the blast furnace manufacturers as blast furnace raw material, it is effective in the operation stability of the blast furnace as a post-process.

Claims (5)

In the apparatus for charging the upper light on the balance of the sintering machine charging unit, An air injection unit (102) for removing fine powder having a small particle size from the lower side of the upper light hopper from the upper light hopper by air injection; The variable screen 105 is formed with a different size of the pastoral 105a so that the fine powder is removed from the sintered semi-reflected 140 from the upper part to the lower part, and the mounting angle is adjustable by the screen hoist 119. And a multi-stage chute, which is integrally mounted at the lower end of the screen 105 and charged into a uniform layer from the opposite side to the bottom of the sintered trolley 117 by being screened by the particle size by the screen 105. Including the sintered semi-reflected 140 by size to insert the opposing from the bottom surface of the trolley 117 so that the particle size becomes smaller toward the upper layer portion to use the sintered semi-reflective 140 of the small particle size as the upper light Sintering top light and raw material charging device, characterized in that configured to be. According to claim 1, wherein the air injection nozzle 120 is a slit (Slit) parallel to the width direction of the sintering machine is designed to control the injection direction, flow rate, pressure (flow rate) of the air, the injection The fine powder separated by the separated air is sent to the rear end of the variable screen 105 so as to be collected through a dust collector 121 such as a cyclone or a bag filter. And raw material charging device. According to claim 1, wherein the predetermined section of the upper side of the screen 105 is the size of the pastoral tree 2 ~ 3mm, the predetermined section is the size of the pastoral tree 3 ~ 5mm, the constant section is the size of the pastoral 5 ~ 7mm Sintering machine top light and raw material charging device characterized in that formed. According to claim 1, The screen hoist 119 is composed of a winch 145 mounted on one side of the upper light hopper 110 and a wire rope 142 hooked to the pulley of the winch 145, the wire rope 142 is a sintering machine top light and raw material charging apparatus, characterized in that the front end is connected to the bottom of the upper surface of the screen (105). The cut-off plate according to claim 1, wherein the multi-stage chute 107 is positioned at the bottom of the variable screen 105 and has three to four stages. (cut off plate) (123) is mounted, the chute 107 is characterized in that it is mounted on the bottom of each of the 2 ~ 3mm section, 3 ~ 5mm section, 5 ~ 7mm section according to the size of the pastoral screen of the screen 105 Sintering machine top light and raw material charging device.