JPH08127822A - Operation of sintering - Google Patents

Abstract

PURPOSE: To reduce the variation of product yield and to improve the product yield by measuring the temp. distribution of a sintered layer discharged from an ore discharging part in a sintering machine, operating a segregation charging device and controlling the characteristic of the sintered layer. CONSTITUTION: Sintering raw material 15 is ignited with an ignition furnace 18 in the sintering machine 17 to start sintering reaction. A radiation thermometer 13 is fitted to the terminal part of the sintering machine 17 to measure the temp. distribution of the whole cross sectional area of the sintered layer 11 at the discharging ore part 12. The measured temp. data are treated with an image analyzer, etc., and the necessary control signal is transmitted to each constituting element of the segregation charging device 20. The segregation charging device 20 controls the characteristic of the sintered layer so that the area ratio of the sintered layer having <=1100 deg.C completing point of the sintering becomes >=90% of the whole sintered layer in each zone divided into the width direction of pallets.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sinter operation method for sinter used in a blast furnace. The present invention relates to a sintering operation method capable of significantly improving the product yield by reducing the unsintered part of the product.

[0002]

2. Description of the Related Art A raw material for sinter ore is discharged from an exhaust ore section at the end of the sinter by a sintering reaction in the sinter, and then, the sinter reaction is completed. There is no high-temperature red tropical zone in the sintered layer, and the sintered ore discharged with a high residual rate of this red tropical zone contains a large amount of unsintered parts, so it is a fine-grained powder. , The product yield of the sintered ore decreases.

Therefore, in order to reduce the residual ratio of the red tropical zone in the sintered layer, for example, Japanese Patent Application Laid-Open No. 4-19391.
In Japanese Patent No. 5 publication, a ventilation rod which is divided in the width direction of the pallet is provided at the inlet of the raw material for sinter, and a cross section of the sinter layer discharged from the sinter machine by a monitor installed in the mine discharge section. A technique is disclosed in which the red heat ratio is calculated by capturing the image, and the depth of the ventilation rod is adjusted so that the red heat ratio becomes a predetermined target red heat ratio. Further, in Japanese Unexamined Patent Publication No. Hei 1-191751, a multi-divided gate is provided in the raw material charging portion in the width direction, and the multi-divided gate is controlled so that the deviation of the thickness of the red-hot layer in the mine discharge portion is reduced. The technique is shown in JP-A-59-
Japanese Patent No. 66685 discloses a technique for monitoring the red heat layer by detecting a boundary position between a bright part and a dark part of a sintered layer surface by an image measuring instrument, and Japanese Patent Laid-Open No. 58-126935. Detects the illuminance of the sintered layer by the ITV device and operates the air flow rate adjusting device based on the ratio of red tropical zone calculated by the image analysis device to adjust the packing density of the inlet of the sinter raw material. The technology is described.

[0004]

However, in any of the above-mentioned techniques, the red tropical zone and the dark zone are discriminated by the mere difference in light and dark in the longitudinal section of the sintered layer, and the sintering completion point is determined by the area ratio of the red tropical zone. Although it is determined, it is difficult to accurately grasp the completion point of the sintering reaction because the red tropical zone includes a region between 1100 ° C. and 800 ° C. at which the sintering reaction has already been completed. is there. Further, since the properties of the sintered layer are controlled based on such inaccurate data, this often results in a decrease in product yield.
No. 93915, JP-A Nos. 1-191751 and 58.
The technique disclosed in Japanese Patent No. 126935 has a problem that the product yield varies greatly despite the control of the red tropics. The present invention has been made in view of such circumstances, and accurately grasps the sintering completion point of the sintering reaction in each portion of the sintering layer along the pallet width direction, and based on this, the sintering is completed. An object of the present invention is to provide a sintering operation method for a sintered ore having a high product yield by controlling the properties of the sintered ore raw material charged in the machine in the pallet width direction.

[0005]

A method according to the above-mentioned object.
The sintering operation method described is a sintering operation method in which a sinter ore raw material is charged on a pallet of a sintering machine through a segregation charging device to sinter the sinter ore raw material. The temperature distribution of the sintered layer discharged from the smelting section of the machine is measured, the segregation charging device is controlled, and the temperature is 1100 ° C. or less in each partition part dividing the sintered layer in the pallet width direction. All the area ratios of a certain portion are 90% or more.

Here, the segregation charging device is a device having a function of adjusting the particle size distribution in the sintered layer of the sintered ore raw material charged on the pallet, and is, for example, JP-A-63-1.
As described in Japanese Patent No. 90125, the sinter ore raw material is tumbled and dropped by a chute arranged at an inclination, and thereafter, the bar is provided at the lower end of the chute and the intervals between the bars are gradually increased toward the front side. It includes a device for sequentially loading particles on the lower pallet in a segregated state while classifying with a spread bar screen. Further, the particle size distribution of the sintered ore raw material in the sintered layer, the run-up distance on the chute of the sintered ore raw material,
Shoot angle, opening width at the tip of the bar screen,
The bar screen can be controlled by changing the inclination angle and the charging rate of the sintered ore raw material. Each partition section divided in the pallet width direction means at least 3 on the chart obtained by measuring the temperature distribution of the sintered layer in the mine ore section with a radiation thermometer or the like.
It refers to a partition portion obtained by vertically dividing the sintered layer into at least one portion having a substantially uniform width. In addition, for example, an image analysis method may be used to calculate the area ratio of the portion of each of the divided portions where the temperature is 1100 ° C. or lower.
In addition to the method using a radiation thermometer, the temperature may be measured by inserting a thermocouple or the like directly into the sintered layer.

[0007]

[Function] Sintering ore raw material, which is a raw material for the sinter ore charged into the blast furnace, is composed of iron ore, limestone, coke, quick lime, etc., and these sintering ore raw materials are individually weighed and mixed. Then, it is granulated with a drum mixer or the like and sintered in a sintering machine. It is important that such a sinter has the strength and grain size necessary for maintaining a good reduction reaction in the blast furnace. Usually, the particle size of the sinter is required to be 2 mm or more. However, when the sintering reaction is insufficient, there is sinter that is discharged before the sintering is completed. Since it becomes a powdery material of 2 mm or less and cannot be used in a blast furnace, it is a factor that the product yield of the sintered ore decreases.

The inventors of the present invention accurately grasp the sintering completion point by measuring the temperature in the sintered layer immediately before being discharged from the sintering machine, and based on this data, the firing to be performed is carried out. The present invention has been completed based on the finding that if the ventilation characteristics of the sinter ore material are adjusted, fluctuations in the product yield of the sintered ore can be suppressed and productivity can be improved. The inventors of the present invention actually measured the temperature of the sintered layer in the sinter of the sinter, and found that the temperature of the so-called bright red tropical zone was
It was found to be distributed over a wide range from 800 ° C to 1450 ° C. On the other hand, the sintering completion point is the temperature at which the temperature of the sintered layer rises to the maximum temperature and then the temperature falls into the temperature lowering zone to complete the solidification of the sintered layer. The temperature is about 1100 ° C. according to the result verified by experiments. It was Therefore, when the sintering completion point is determined simply by the bright red tropical zone, the red tropical zone has a sintering reaction of 1100 ° C. to 800 ° C.
Due to the inclusion of the region between, it is not possible to accurately grasp the completion point of the sintering reaction. Therefore, in the sintering operation method according to claim 1, the temperature of the sintered layer in the slag ore is accurately measured by a radiation thermometer or the like, and the sintering is completed in each section divided in the pallet width direction. 110 points
The characteristics of the sintered layer made of the sintered ore raw material charged in the sintering machine are controlled so that the area ratio of the sintered layer having a temperature of 0 ° C. or lower is 90% or more of the total sintered layer.

Here, in the above control, when the area ratio of 90% or more of the vertical cross section of the sintered layer is less than 90%, the product yield of the sintered ore is as shown in FIG. This is because the quality (strength) of the sintered ore product also deteriorates in addition to the remarkable decrease. Further, in the present invention, since the area of the portion at 1100 ° C. or lower, which is the completion point of sintering, is controlled, the upper limit of the area is 100%.

The sintering reaction in the sintering machine is completed while the sintering reaction proceeds while the sinter ore raw material in the sintered layer ignited in the ignition furnace gradually melts and finally solidifies. This sintering reaction occurs when the coke is oxidatively burned by the air introduced from above the sintered layer. Therefore, if the air-permeable characteristics of the sintered layer are non-uniform, non-uniformity occurs in the intake of air into the sintered layer, resulting in a difference in the temperature distribution of the sintered layer in the mine ore. In the sintering operation method according to claim 1, the state of particle size distribution in the sintered layer of the sintered ore raw material is changed by a segregation charging device of the sintered ore raw material to adjust the ventilation characteristics of the sintered layer. By doing so, the temperature distribution of the sintered layer of the slag ore is controlled. Therefore, since the product yield of the sintered ore under such controlled conditions is controlled based on accurate data of the sintering reaction, it can be maintained at a high level with little fluctuation.

[0011]

Embodiments of the present invention will now be described with reference to the accompanying drawings to provide an understanding of the present invention. FIG. 1 is a schematic explanatory view of an apparatus to which a sintering operation method according to an embodiment of the present invention is applied, and FIG.
The figure which shows the relationship between the area ratio of a part below 00 degreeC, and the yield of a sintered mineral product, and FIG. 3 is a longitudinal cross-section temperature in the sinter layer of the ore discharge part which applied the sintering operation method which concerns on one Example of this invention. Distribution map, Figure 4
Fig. 5 is a vertical cross-section temperature distribution diagram of the sintered ore sinter layer in the comparative example, and Fig. 5 is a diagram showing the relationship between the area ratio of the portion of the sintered ore sinter layer at 1100 ° C or less and each control element of the segregation charging device FIG. 6 is an explanatory view of a longitudinal section of the segregation charging device.

An outline of an apparatus to which the operating method of the sintered ore shown in FIG. 1 is applied will be described. The apparatus is a charging hopper 10, a segregation charging device 20, a pallet 16 in a sintering machine 17, and a radiation thermometer. It is configured to be large by 13 and 13. here,
A sinter ore raw material 15 obtained by granulating quicklime, powdered coke, iron ore and other auxiliary materials as raw materials for sinter is charged into a charging hopper 10 and a raw material supply port provided below the charging hopper 10. A drum feeder 19 for controlling the supply amount of the sintered ore raw material 15 is attached to. The drum feeder 19 is configured to control the amount of raw material supplied to the segregation charging device 20 according to a signal from the calculator 14.

The sintered ore raw material 15 charged from the charging hopper 10 and segregated and adjusted is ignited by the ignition furnace 18 in the sintering machine 17 to start the sintering reaction. Here, the sintering machine 1
For No. 7, a DL type sintering machine having a sintering ignition temperature of 1000 ° C., an effective machine length of 120 m, a pallet width of 4 m, a pallet transfer speed of 3.0 m / min, and a thickness of the sintered layer 11 on the pallet 16 of 550 mm was used. The radiation thermometer 1 is provided at the end of the sintering machine 17 which faces the mine ore 12 where the sintered raw material is discharged.
3 is attached and arranged so that the temperature distribution of the entire cross-sectional area of the sintered layer 11 of the mine ore portion 12 can be measured.
In the segregation charging device 20 shown in FIG. 6, the sinter ore raw material 15 supplied from the drum feeder 19 is tumbled and dropped by the chute 22 that is arranged in an inclined manner, and then the bar is provided at the lower end of the chute 22 and each bar. While being classified by the bar screen 21 in which the distance between the two gradually widens toward the front side, the pallet 16 below is loaded in a segregated state. And
The segregation charging device 20 is divided into 10 parts in the pallet width direction, each of which can be independently controlled.
It consists of individual components. The particle size distribution of the sintered ore raw material 15 in the sintered layer 11 is as follows:
Second run distance, shoot angle, bar screen 21
It is arranged so that control can be performed by changing the bar opening width at the tip, the bar screen inclination angle, the charging speed of the sintered ore raw material 15, and the like. Then, the temperature data from the radiation thermometer 13 is taken into a calculator 14 provided outside the sintering machine 17, data processing such as image analysis is performed in the calculator 14, and a program installed in advance. According to the segregation charging device 2
It is configured to send to each component of 0.

Using the sintering machine configured as described above,
As a comparative example, the following operation was performed. 80 iron ore
Wt%, quick lime amount 3Wt%, powder coke amount 4Wt%, limestone amount 13Wt% granulated sinter ore raw material 15 from the charging hopper 10 through the segregation charging device 20 on the pallet 16 Charged. At this time, 10 of the segregation charging device 20
In each of the individual constituent parts, the running distance of the sintered ore raw material 15 on the chute 22 is 60 cm, and the angle of the chute 22 is 50 cm.
Degree, the total length of the bar screen 21 is 0.8 m, the bar opening width at the tip of the bar screen 21 is 6 cm, the bar screen 2
The operation was performed under the condition that the inclination angle of 1 was 40 degrees. In this way, in the measurement data obtained by measuring the temperature distribution of the sintered layer 11 in the ore discharge part 12 with the radiation thermometer 13, the sintered layer 11 is divided into five sections A to E in the width direction of the pallet 16. A temperature distribution diagram as shown in FIG. Here, the shaded region represents a region where the temperature is 1100 ° C. or higher, that is, the portion where the sintering reaction is not yet completed, and the region below the dotted line is the temperature that is conventionally known as red tropical zone. A high-brightness portion at 800 ° C. or higher is shown. Numerical values corresponding to the sections A to E are the area ratios of the sections where the temperature is 1100 ° C. or less in each section, and
It represents the product yield. In this way, actually measured 8
There is a considerable difference in the tendency of the distribution state between the so-called red tropical zone where the temperature is 00 ° C. or higher and the region where the temperature is 1100 ° C. or higher, and it can be seen that the sintering reaction cannot be sufficiently controlled by the conventional method of controlling by the red tropical zone. In this case, the average product yield of all the sintered layers 11 was as low as 81.5%, the productivity was 31 t / (d · m ² ), the sinter strength was 90%, and the powder coke basic unit was It was 48 kg / t. Here, the sinter ore strength is expressed by the ratio of the sinter ore that remains without being destroyed when the sinter ore having a predetermined grain size is freely dropped onto a steel plate from a predetermined distance.

Therefore, as an example, the segregation charging is carried out according to the relationship between the area ratio of the portion of 1100 ° C. or less and each control element of the segregation charging device 20, which is obtained in advance by actually performing the operation. For each constituent element at a position corresponding to the section A to E of the charging device 20, the run-up distance of the sintered ore raw material 15 on the chute 22, the angle of the chute 22, the bar opening width at the tip of the bar screen 21. , The inclination angles of the bar screen 21 are 60 cm, 55 degrees, and 5c, respectively.
By adjusting the m and 43 degrees, the area ratio in each of the sections was maintained at 90% or more for operation as shown in FIG. The average product yield of all the sintered layers 11 thus obtained is 84%,
Productivity is 32t / (d · m ² ), sinter strength is 92%,
The powder coke basic unit was 46 kg / t, which was superior to the comparative example in which control was not performed by the segregation charging device 20, and the segregation charging device 20 reduced the temperature to 1100 ° C. or less in each section. Area ratio of the part of 90
It was possible to suppress the variation in the product yield by adjusting the content to be not less than%. In the above description, the control was manually performed according to the relationship between the area ratio of the portion where the temperature in the sintered layer 11 of the smelting ore portion 12 is 1100 ° C. or less and each control element. It is also possible to execute the program according to a program preset in 14.

[0016]

According to the sintering operation method of claim 1,
Accurately grasp the sintering completion point of the sintering reaction for each section divided in the pallet width direction of the sintered layer discharged from the smelting section, and based on this, the segregation charging device is used to enter the sintering machine into the sintering machine. By controlling the properties of the sintered layer to be charged at the positions corresponding to the respective sections, it is possible to reduce the fluctuation of the product yield and to manufacture a sintered ore with a high product yield.

[Brief description of drawings]

FIG. 1 is a schematic explanatory view of an apparatus to which a sintering operation method according to an embodiment of the present invention is applied.

FIG. 2 is a diagram showing a relationship between an area ratio of a portion of a sintered layer of a discharged slag portion at 1100 ° C. or lower and a yield of a sintered mineral product.

FIG. 3 is a vertical cross-sectional temperature distribution diagram in the sinter layer of the ore discharge part to which the sintering operation method according to the embodiment of the present invention is applied.

FIG. 4 is a vertical cross-sectional temperature distribution diagram of a sintered ore sinter layer in a comparative example.

FIG. 5 is a diagram showing a relationship between an area ratio of a portion at a temperature of 1100 ° C. or less in a sintered layer of a slag ore and each control element of the segregation charging device.

FIG. 6 is an explanatory view of a longitudinal section of the segregation charging device.

[Explanation of symbols]

 10 Charging Hopper 11 Sintered Bed 12 Exhaust Ore Part 13 Radiation Thermometer 14 Calculation Device 15 Sintering Ore Raw Material 16 Pallet 17 Sintering Machine 18 Ignition Furnace 19 Drum Feeder 20 Segregation Charger 21 Bar Screen 22 Chute

Claims (1)

[Claims] 1. A sintering operation method in which a sinter ore raw material is loaded onto a pallet of a sinter machine through a segregation charging device to sinter the sinter ore raw material. The temperature distribution of the sintered layer discharged from the ore portion is measured, the segregation charging device is controlled, and the temperature of 1100 ° C. or less is applied to each partition portion that divides the sintered layer in the pallet width direction. A sintering operation method characterized in that the area ratios are all 90% or more.