JPH0353013A - Method for controlling charge of blast furnace - Google Patents

Abstract

PURPOSE:To rapidly control the grain size distribution meeting the grain sizes of sintered ore by controlling the operation of a movable armor in accordance with the average grain size of the sintered ore obtd. by making arithmetic processing from the television camera image of the sintered ore on a feeder. CONSTITUTION:The sintered ore 6 is fed out of a sintered ore tank 1 and is charged via a conveyor 3 of the belt feeder 2 into a blast furnace 4. The sintered ore 6 on the above-mentioned feeder 2 is photographed by the television camera 7. The image signal obtd. in such a manner is sent to an image processor 8. The average grain size of the sintered ore 6 is computed. The computed value of the average grain size is sent to an arithmetic unit 9 in which the data on the relation between the average grain size of the sintered ore and the strength of the armor is previously inputted. The strength of the armor corresponding to the average grain size of the sintered ore 6 mentioned above is determined in accordance with the above-mentioned data. The operation of the movable armor is controlled via a driving device 10 by the result thereof. The raw material distribution on a stock line 5 meeting the grain size of the sintered ore after a change is obtd. with good responsiveness in this way and the stable furnace condition is maintained.

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention relates to a method for controlling charges in a blast furnace. [Prior Art] Sintered ore accounts for over 80% of the main raw material charged in a blast furnace, and changes in the properties of sintered ore greatly affect the condition of the blast furnace. In particular, if the particle size changes significantly (if the particle size becomes smaller, more slag will flow into the center of the furnace, the temperature below the bell will drop and the furnace condition will worsen), the gas distribution inside the blast furnace will change significantly. This is considered to be a cause of unstable reactor conditions. Conventionally, ore/
Charge distribution is controlled by changing coke and movable armor. In recent years, attempts have been made to photograph the stock line with a television camera installed at the mouth of the blast furnace and use the information obtained from the images to stabilize the conditions in the blast furnace, but such technology has not yet been developed. Not published. Recently, Japanese Patent Application Laid-Open No. 63-2909 (1983-2909), which uses a furnace rotor television camera to photograph the surface of the charge on the stock line and processes the image to measure the particle size of the charge.
Publication No. 43 has been published. [Problem to be solved by the invention] The conventional method of controlling the burden distribution by operating the movable armor based on the temperature below the bell and the gas temperature distribution is difficult to control when small-diameter sintered ore is in the furnace. When the reactor is descending, that is, after the reactor condition has worsened, it takes time for the reactor condition to recover. Furthermore, the method of measuring the particle size of the charge using a television camera installed at the furnace mouth allows the action to be taken earlier than the method described above, but there is a problem in that the furnace condition deteriorates. [Means for Solving the Problems] This invention attempts to solve the above-mentioned problems, and the sintered ore on the bottom cutting feeder of the sintering tank is photographed with a television camera, and the sintered ore is sintered with an image processing device. Calculate the average grain size of the ore,
This is a blast furnace charge control method in which the armor strength for the average grain size is determined using a calculation device that has previously input the relationship data between the average grain size of the sintered ore and the armor strength, and the operation of the movable armor is controlled based on the results. [Operation] The video signal taken under the sintered ore tank is processed by the image processing device, the average particle size of the sintered ore is measured and calculated, and the arithmetic device calculates the
The armor strength is collated and calculated from the average particle size obtained by the image processing device. The movable armor at the top of the furnace is operated according to the determined armor strength, and a raw material distribution that matches the changed particle size is obtained. Therefore, unlike the conventional method, which deteriorates the furnace condition and takes time to recover, it is possible to maintain stable furnace condition. [Example] Examples of the present invention will be described in detail below. FIG. 1 is a block diagram implementing the method of the present invention. 1 is the hot coal tank,
2 is a belt feeder under the sintered ore tank, 3 is a conveyor, 4 is a blast furnace, 5 is a stock line, and 6 is sintered ore on the belt feeder 2. 7 is a television camera that photographs the sintered ore on the belt feeder 2; 8 is an image processing device; 9 is a calculation device; 1
0 is the movable armor drive device. In the above equipment arrangement, the method of the present invention sends an image signal taken by the television camera 7 to the image processing device 8, calculates the average particle size of the sintered ore in the image processing device 8, and sends the average particle size signal to the calculation device 9. send. The arithmetic unit compares the average grain size with the relationship data between the average grain size of the slag and the armor strength of the movable armor that has been input in advance, determines the armor strength, and sends a signal to the movable armor drive device 10 at the top of the furnace. The movable armor drive device 10 moves the armor head by the determined armor strength and corrects the raw material distribution. Figure 3 is a graph showing the relationship between the change in the average particle size of sintered ore and the temperature below the bell in the conventional method. Sampling of the sintered ore particle size measurement sample was carried out on a belt feeder below the sintered ore tank. In addition, the temperature below the bell is expressed as the time corrected by the predetermined time during which the particle size change affects the temperature. Figure 3 shows that as the average grain size of the sintered ore changed from 131 to 11 in the direction of smaller grains over a period of 7 hours, the temperature under the bell decreased from 600 to 500 °C. Figure 2 is a graph showing the relationship between the change in the average particle size of sintered ore and the temperature below the bell when the method of the present invention is used. The time correction for the temperature below the bell is the same as above.

4 hours after the start of the test, the average particle size became 11.5sm, so the armor strength at ○↓O↓C↓C↓ was changed to B6B4 (
Armored is 1000 from 500 battles from the furnace wall.
It reciprocates between 50 mm and 50 mm apart from the center side toward the furnace wall. For example, 4 is 8 5 mm from the furnace wall.
The positions are named 0 u+, 6 is the position 750 points from the furnace wall, and so on. In addition, B is 500 from the furnace wall.
Represents the position of as. Therefore, for B6B4, the armor head is set back 500 mm from the furnace wall → 750 mm from the furnace wall.
Advance at am → retreat from the furnace wall to 5 00 + n → advance from the furnace wall to 8 50 am. ) was changed to 86B5, and the average particle size further decreased to 11.2 mm after 6 hours, so the armor strength was changed to B4B6. As a result, the temperature under the bell could be maintained at 590°C or higher.
Despite the particle size becoming smaller, the furnace conditions remained stable. [Effects of the Invention] The method of the present invention photographs the sintered ore on the belt feeder under the tank with a television camera, calculates the average grain size through image processing, determines the armor strength that matches the average grain size with a calculation device, and Since the movable armor is automatically operated, even if the slag grain size changes toward a smaller diameter, the furnace conditions will not worsen as in the past.

[Brief explanation of drawings]

FIG. 1 is a block diagram for implementing the method of the present invention, and FIG. 2 is a graph diagram showing the relationship between the change in the average particle size of sintered ore and the temperature below the bell at that time when the method of the present invention is implemented. Third
The figure is a graph showing the relationship between changes in sintered ore and the temperature below the bell in the conventional method.

Claims (1)

[Claims] The sintered ore on the feeder cut out from the bottom of the sintering tank is photographed with a TV camera, the average particle size of the sintered ore is calculated using an image processing device, and then the relationship data between the average particle size of the sintered ore and the armor strength is input in advance. A blast furnace charge control method that calculates the armor strength for the average particle size using a calculation device and controls the operation of the movable armor based on the results.