KR20040005454A - Apparatus and method for diagnosing sintered ore screen - Google Patents

Abstract

PURPOSE: An apparatus and a method for diagnosing sintered ore screen are provided to diagnose clogging and damage of sintered ore screen by measuring quantity of fine sintered ore generated when screening sintered ore injected into blast furnace. CONSTITUTION: The apparatus comprises a discharge quantity detecting part(30) for measuring discharge quantity of sintered ore discharged from sintered ore storage hopper; a weight measuring part(40) mounted on the transfer conveyor belt to measure weight of sintered ore transferred when the sintered ore is transferred by transfer conveyor belt after the discharged sintered ore is separated in a lower part of the screen through grain size sorting process in screen; a speed detecting part(50) mounted on the transfer conveyor belt to detect speed of the transfer conveyor belt; an operation part(60) connected to the weight measuring part and the speed detecting part to derive a generation quantity of fine sintered ore by receiving weight measured values and speed measured values; a control part(70) for judging the screen state by comparing data of the operation part and the discharge quantity detecting part with table value of a reference generation quantity of fine sintered ore according to discharge quantity of sintered ore; and a display part(80) connected to the control part to display the judge screen state and information inputted into the control part.

Description

Sintered ore screen diagnostic device and method {APPARATUS AND METHOD FOR DIAGNOSING SINTERED ORE SCREEN}

The present invention relates to an apparatus and a method for diagnosing a sintered ore screen, and more particularly, to an apparatus and a method for diagnosing blockage and breakage of a sintered ore screen by measuring a generation amount of sintered ore in a sintered ore input into the blast furnace. .

In general, the particle size of the sintered ore stored in the blast furnace sintered ore storage tank and used in the blast furnace is about 5 to 20 mm, and smaller sintered ore of less than 5 mm is referred to as sintered ore. When the sintered ore is directly charged into the blast furnace, it causes the flow of gas inside the blast furnace, which leads to the blast furnace relief and causes a decrease in production. Therefore, the sintered ore of 5 to 20 mm is a raw material for producing molten iron. The charged sintered ore of 5 mm or less is sent back to the sintering plant and used as a raw material for reprocessing into a sintered ore.

Figure 1 is a schematic diagram for explaining the basis weight process of blast furnace ore. Referring to the drawings, the sintered ore produced in the factory is transferred to the conveyor belt to fit the blast furnace operation is stored in the sintered ore storage hopper (11). In the lower part, the screen 12 is installed in order to sort the divided sintered ore less than 5mm which is broken during the transfer before charging the sintered ore into the blast furnace. In the screen 12, the sintered ore is screened by 5 to 20 mm, and the sintered ore larger than 5 mm is moved above the screen 12 to the ore basis weight hopper 15 of the blast furnace 10 and used as a blast furnace molten iron raw material. The sintered ore of 5 mm or less exits the screen 12 and is transported by the conveying conveyor belt 20 and stored in the divided sintered ore storage tank 17. This stored sintered ore is sent to a sinter plant for use as a feedstock.

In this process, the screen 12 installed under the sintered ore storage hopper 11 of the blast furnace 10 is continuously worn out by the rotational vibration of the screen vibrator when it is operated for a long time. When the screen 12 is worn, the particle size selection ability of the screen 12 is lowered, through which the sintered light of 5 mm or more is drawn out below the screen 12 through the worn part. As the sintered ore exiting the lower portion of the screen 12 increases, the amount of sintered ore delivered through the conveying conveyor belt 20 is excessively increased. This increase in the amount of sintered ore causes not only the failure of the conveyor belt equipment for transporting the sintered ore, but also increases the workload of the sintering process. In addition, if clogging of the screen hole occurs due to ore during the process, the blockage rate of the screen 12 is increased, and the particle size selection ability of the sintered ore of the screen 12 is lowered. The distinction of sintered ore is not made and moves to the upper portion of the screen 12. When the unseparated sintered ore enters the ore basis weight hopper 15 of the blast furnace 10, the result is that the sintered ore is introduced into the blast furnace 10, which causes problems in the blast furnace process.

In particular, in the blast furnace process having a sintered ore supply process as shown in Figure 2, for example, when each blast furnace is supplied from a separate sintering and coke process for each blast furnace process, such as 1 to 4 blast furnaces Unlike 5 blast furnaces, when raw materials are supplied from other sintering and coke processes, the quality of the sintered ore is not uniform due to the difference in the working method of each sintering process, and the sintered ore must be transported at a long distance. There is a possibility that the proportion of the sintered ore increases due to the collision itself. Therefore, in such a process system, the process of separating the sintered ore is particularly important, and the possibility of clogging and abrasion of the screen 12 also increases. In fact, the results of the investigation of the amount of sintered ore generated at the blast furnace 5 of Gwangyang Works with the sintered ore supply process shown in FIG. 2 are shown in Table 1. BC shown in FIG. 2 means a conveyor belt.

NO Collection count (times) Sintered Light Emissions (ton) Partially Light Fluorescence Measurement (kg) Partially resolved ratio (%) One 3 One 200 20% 2 3 5 975 19.5% 3 3 8 1365 17% 4 3 10 1755 18% 5 3 12 2145 18%

As shown in Table 1, it can be seen that the ratio of the powdered sintered ore in the sintered ore is about 19%, which is high. Therefore, when the blockage of the screen 12 occurs or breaks in such a blast furnace, the effect on the yellowing is very large. That is, in the blast furnace operation, the sintered ore of the appropriate particle size is required, and since the amount of minute sintered ore generation is an important factor which will influence the blast furnace aging, the screen state should be judged early.

In actual work processes, however, early determination of the screen state is not easy. Therefore, in general, when the air permeability of the blast furnace furnace is poor, and the number of times of transportation of the truck carrying the sintered ore increases, the amount of the sintered ore generated and the screen 12 broken state are checked. The method first checks the sintered ore transported from the site of the sintered ore transport conveyor belt 20 on site by activating the screen 12 one by one by the field operator in contact with the central cab and clogging the screen 12 and A method of roughly determining whether there is a breakage and then opening the inspection manhole of the screen 12 in the field is opened and the operator directly enters the screen 12 again and checks.

However, the conventional screen state determination method has the following problems.

First, since the operator checks the amount of sintered ore transport on the conveyor belt in the field on the neck side to determine the screen state, it is difficult to determine the exact screen state because the neck judgment between the workers is different from each other.

Second, because it is difficult to check the state of the fixed sintered ore every day due to the operating conditions, it is difficult to determine the screen condition early detection, that is, it is difficult to determine the early detection of the screen state, which is a factor of the operation instability.

The present invention has been made to solve the above problems, a method and apparatus for diagnosing the blockage and damage of the screen by using the data of measuring the amount of sintered ore generated by screening the sintered ore injected into the blast furnace It aims to provide.

1 is a schematic view for explaining a basis weight process of blast furnace ore.

2 is a schematic view for explaining an example of a sintered ore supply process.

3 is a block diagram of a sintered ore screen diagnostic apparatus according to the present invention.

Figure 4 is a perspective view showing a conveying conveyor belt equipped with a basis weight measurement unit and a speed detection unit according to the present invention.

FIG. 5 is a plan view of the conveying conveyor belt of FIG. 4. FIG.

6 is a flowchart schematically illustrating a screen diagnosis method according to the present invention.

* Explanation of symbols for main parts of the drawings

10. Blast Furnace 11.

12. Screen 13. Ore weight hopper

15. Ore basis weight hopper 20. Transfer conveyor belt

21. Conveyor Frame 30. Emission Detection Unit

40. Basis weight measurement unit 50. Speed detection unit

60. Operation unit 70. Control unit

80. Display

In order to achieve the above object, the sintered ore screen diagnostic method according to the present invention comprises the steps of (a) measuring the sintered ore discharge discharged from the sintered ore storage hopper; (b) measuring the weight of the divided sintered ore transported when the discharged sintered ore is separated through the particle size screening process on the screen and then transported through the transporting conveyor belt, and measuring the speed of the transporting conveyor belt; (c) calculating the amount of mined sintered ore by receiving the data measured in step (b); (d) diagnosing a screen state by comparing the discharge value measured in step (a) and the calculated value of step (c) with a table value for a reference amount of sintered ore generation amount according to sintered ore emissions; And (e) displaying the screen state determined by being connected to the control unit and information input to the control unit.

According to another aspect of the present invention, there is provided a screen diagnostic apparatus including: an emission detection unit configured to measure emission of sintered ore discharged from a sintered ore storage hopper; A basis weight measurement unit mounted on the conveying conveyor belt to measure the weight of the sintered ore conveyed when the discharged sintered ore is separated by the particle size sorting process on the screen and then conveyed by the conveying conveyor belt; A speed detecting unit mounted to the conveying belt to detect the speed of the conveying belt; A calculation unit connected to the basis weight measurement unit and the speed detection unit to derive the amount of generated sintered ore by receiving a weight measurement value and a speed measurement value; A control unit for determining a screen state by comparing data of the calculation unit and the emission detection unit with a table value of a reference generation amount of sintered ore according to sintered ore emissions; And a display unit connected to the control unit to display the determined screen state and information input to the control unit. Characterized in having a.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

3 is a block diagram of a sintered ore screen diagnostic apparatus according to an embodiment of the present invention.

Referring to the drawings, the sintered ore screen diagnostic apparatus according to the present invention includes a discharge detection unit 30 for detecting the discharge of the sintered ore discharged from the sintered ore storage hopper (11). The discharge detection unit 30 receives the gate information of the storage hopper 11 opened and closed by the raw material control unit to charge the sintered ore into the blast furnace 10, calculates the amount of sintered ore discharged from the storage hopper 11 and this information is It is input to the control part 70. The amount of sintered ore discharged is calculated from (the amount of sintered ore X discharged per unit time through the gate of the storage hopper).

The sintered ore discharged from the storage hopper 11 is sorted by the particle size through the screen 12 so that the small sized sintered ore is transported by the minute sintered ore conveying conveyor belt 20. The conveying conveyor belt 20 is equipped with a basis weight measuring unit 40 for measuring the weight of the conveying amount of the divided sintered ore and a speed detecting unit 50 for detecting the speed of the conveying conveyor belt. The weight information of the conveying minute sintered ore measured by the basis weight measuring unit 40 and the speed information of the conveyor belt measured by the speed detecting unit 50 are input to the calculating unit 60, and the calculating unit 60 receives the amount information. Is inputted to measure the amount of generated mined sintered ore.

The emission data of the emission detection unit 30 and the amount of sintered ore generation data of the calculation unit 60 are input to the control unit 70.

The control part 70 prepares and stores the data regarding the appropriate amount of minute sintered ore according to the amount of sintered ore discharge | emission in a table. The control part 70 compares this table value, the discharge data of the discharge detection part 30, and the amount of generation of the sintered ore by the calculation part 60, and diagnoses the sintered ore screen state. For example, assuming that the measured value in Table 1 is the amount of atomized light generated when the screen is in a steady state, the screen is in a normal state when the amount of atomized light is about 19% of the amount of sintered ore discharged. Using this value as a reference value, when the amount of generated sintered ore decreases by about 9%, that is, when it is 10% or less, the sintered ore screen is judged to be clogged, and when the amount of generated sintered ore increases by about 6% or more from the reference value, that is, when it is more than 25%. It can be set to determine that the screen is in a broken state. These tables are shown in Table 2. The amount of sintered ore generated according to the amount of sintered ore depends on the characteristics of the sintering process and the transport distance of the sintered ore. Therefore, it can be determined through a number of experiments when the screen is in a steady state.

Occlusion rate (%) catch Good Bad below 10 More than 10% Less than 25% 25% or more

The display unit 80 is connected to the controller 70. The display unit 80 is equipped with an alarm device or an alarm lamp for notifying when the screen is blocked or in a bad state, and a monitor for continuously displaying information and a determination state input to the controller 70. If the screen is out of the normal state, the controller 70 sounds an alarm or notifies the operator of the state of the screen through the lighting of the alarm lamp, and displays the data and judgment state input to the field monitor to monitor the screen state continuously. To be able.

4 shows a conveying conveyor belt equipped with a basis weight measuring unit and a speed detecting unit. FIG. 5 shows a plan view of the conveying belt shown in FIG. 4. Referring to the drawings, the basis weight measuring unit 40 is a weight flame and a load cell in a predetermined section of the divided sintered ore conveying belt 20 in which a small size of sintered ore separated and separated from the screen is transported. And a one-piece set consisting of a roller device. The weighting frame 45 is a rectangular frame consisting of a pair of horizontal extensions positioned in the extending direction of the conveyor frame 21 and a pair of vertical extensions positioned in the direction crossing the conveyor frame 21. The weighting frame 45 is located between the frames of the conveying belt and separated from the main frame and mounted to the conveyor frame 21 by bearings 22. Two sets of roller devices are provided in the middle of the weighting frame 45. The ruler device is rotated by mounting the belt 25 of the conveying conveyor belt. The roller device includes one roller 41 installed in parallel in the middle portion and two rollers 42 connected to the roller 41 and inclined to one side on both sides. A roller stand 43 is formed at the lower portion of the rollers to support the combined rollers and to engage with the weight frame 45. A load cell 46 capable of detecting a weight is connected to the upper side of the horizontal extending portion of the weighting frame 45, two sets of left and right pairs on both sides of the roller device 21. Each load cell 20 is connected to a weight detector to measure the weight. The load cell 46 is fixed to the conveyor frame 21 and is separated from the weight frame 45. The load cell 46 and the weight frame 45 are connected by a spring so that when the weight frame 45 moves, the spring 23 transmits a movement value to the load cell 46. Each load cell 46 is connected to the weight detector 48, so that the change in the measured value of the load cell 46 is input to the weight detector 48, this value is configured to be input to the calculation unit 60. At the end of the weight frame 45, a weight 44 for balancing the weight frame 45 is provided. The front end is equipped with a calibration bar 47 for balancing the load cell 46. The calibration bar 47 is adjusted to adjust the zero point of the load cell 46 at no load. .

That is, the sintered ore manufactured in the sintering plant is fabricated into the blast furnace sintered ore storage hopper 11 using the conveyor belt BC, and the sintered ore is passed through the screen 12 and the large sized sintered ore is the ore weight hopper 13 Enter and move to the ore basis weight hopper 15 of the blast furnace. The small sized sintered ore exits below the screen 12 and is transported through the divided sintered ore conveying belt 20.

Initially, the conveying conveyor belt 20 is rotating in a no-load state, and the weight measurement measured in the basis weight measurement unit in this no-load state is displayed as data measured by the cab and the field monitor 80, The operator can check whether the operation state is normal. When the screen 12 is operated in the central cab, the small sized sintered ore separated by the screen 12 is moved to the position where the weight frame 45 is located by the transfer conveyor belt 20. When the sintered ore moves above the weight frame 45, the initial no-load data value is changed by the vertical movement of the load cell 46, and the changed weight value is calculated by the weight detector 48 connected to the load cell 46. 60).

The conveying belt 20 is provided with a speed detecting unit 50 for the belt speed. The speed detecting unit 50 detects the speed by detecting the rotation of the roller 51 and the roller frame 52 for fixing the roller 51 and the roller 51 installed in contact with the rear surface of the belt 25 to the conveyor frame 21. It consists of a speed detector 55. The roller 51 is connected to the speed detector 55 located at one side of the conveyor frame 21, and the speed detector 55 detects the rotation of the roller and inputs it to the calculator 60. This is configured to detect the speed of the conveyor belt.

6 shows a flowchart of a screen diagnostic method according to the present invention. Referring to the drawings, the flowchart S200 on the left is a blast furnace process, and the flowchart S300 on the right is a flowchart of a screen diagnosis method.

When the blast furnace process is started by the blast furnace process control unit, the gate of the sintered ore storage hopper is opened by the raw material control unit is discharged (S210). At this time, the opening and closing information of the gate is input to the emission detector 30 to measure the sintered ore emissions (S310). The discharged sintered ore is subjected to the particle size screening process by the screen installed under the storage hopper (S220). The small sintered ore below a predetermined value exits the bottom of the screen (S232), and the large sintered ore is moved from the top of the screen and charged into the ore basis weight hopper 15 of the blast furnace through the ore weight hopper 13 (S224). In accordance with the progress is charged in the blast furnace (S226). Small sized sintered ore, that is, divided sintered ore separated into the lower portion of the screen is transported by the powdered sintered ore conveying belt (S234), collected in the divided sintered ore storage tank (S236) and sent back to the sintering process (S238).

The weight of the divided sintered ore and the speed of the belt are detected by the basis weight measuring unit 40 and the speed detecting unit 50 mounted on the conveying conveyor belt 20 while the segmented light is conveyed through the conveying conveyor belt (S320). . This information is input to the calculation unit 60 to calculate the amount of generated sintered ore (S330). The calculation result of the calculation unit 60 and the detected sintered ore emission value are input to the control unit 70, and the control unit 70 is inputted by the information and information on the sintered ore output received from the emission detection unit 30 and the operation unit 60. The screen state is diagnosed by comparing the sintered ore generation information with a table value about the appropriate amount of sintered ore generation according to the sintered ore emissions (S340). The amount of generated standard sintered ore according to the discharge is a value that varies depending on the work characteristics of the sintering process, the transfer distance from the sintering process to the sintered ore storage hopper, and the characteristics of the equipment. Therefore, it is preset by experiments when the screen is in a steady state. This value is created in a table and previously input to the control unit.

The control unit compares the table value with the input information, and if it is determined that the screen is clogged, an alarm is triggered to inform the screen cleaning time. In addition, if it is determined that the screen is in a bad state such as breakage, an alarm is activated to inform the screen replacement time. Then, the input data and the screen state are displayed through the monitor (S344). If the amount of generated sintered ore is within an appropriate value, the control unit monitors the input data and displays the screen state as good (S342). Workers in the shop floor can not only know the screen condition is clogged and defective at an early stage, but also monitor the screen condition continuously through the monitor.

Hereinafter, the operation and the diagnostic method of the screen diagnosis apparatus will be described in more detail with reference to the following examples.

In the blast furnace operation with a sintered ore supply process as shown in Table 1 above, the result of measuring the amount of divided fluorescence generated when the screen is in a steady state is shown in Table 2, and the discharged through the sintered ore storage hopper Assuming that the amount of sintered ore is 14 tons, the emission detection unit receives the gate opening and closing information of the raw material control unit and inputs this value of 14 tons to the control unit. The discharged sintered ore is subjected to a particle size sorting process on the screen, and the divided sintered ore exiting to the lower portion of the screen is transferred through the conveying conveyor belt 20. At this time, the weight value W in the basis weight measurement unit, the speed value V in the speed detection unit is measured and input to the calculation unit. The W and V values are input to the calculation unit to derive the amount of divided sintered ore and input to the control unit. At this time, when the calculated value inputted to the controller is 2500 kg, the controller displays this value in the reference table shown in Table 2 (10% to 25% of the discharge amount, that is, 1400kg to 3500kg, the screen is in good condition, and the discharge amount is 10% or less, that is, 1400kg or less. The screen is clogged and the screen is broken when the discharge is more than 25%, or more than 3500 kg. In the case of 2500kg, the controller determines that the screen is in the blocked state and sounds an alarm, and displays this information on the field monitor. In addition, when the input value input from the calculating unit is 4000 kg, the control unit determines that the screen is in a bad state and sounds an alarm and displays it on the field monitor. If the value input from the calculating unit is 3000 kg, the control unit judges that the screen is in a good state, and displays this information on a monitor or the like. The operator can clearly recognize when the screen is cleaned or when it is replaced by the alarm or warning lamp, and the monitor can monitor the screen condition continuously.

According to the screen diagnosis apparatus and method according to the present invention, the screen state can be determined by the weight of the sintered ore and the weight and the belt speed of the divided sintered ore conveyed through the conveying conveyor belt, thereby diagnosing the screen state in a timely manner, and You can decide when to replace it. The monitor status can be continuously recognized through a monitor or the like. Therefore, it is possible to prevent the aging of the blast furnace due to the failure to replace the screen in a timely manner, the aging management of the blast furnace is easy, and the work burden to check the screen state with the naked eye can be eliminated from time to time. As mentioned above, although preferred embodiment of this invention was described in detail, this invention is not limited to the said embodiment, A various deformation | transformation by a person of ordinary skill in the art within the scope of the technical idea of this invention is carried out. This is possible.

Claims (4)

Sintered ore screen diagnostic method comprising the following steps. (a) measuring the amount of sintered ore discharged from the sintered ore storage hopper; (b) measuring the weight of the divided sintered ore transported when the discharged sintered ore is separated through the particle size screening process on the screen and then transported through the transporting conveyor belt, and measuring the speed of the transporting conveyor belt; (c) calculating the amount of mined sintered ore by receiving the data measured in step (b); (d) diagnosing a screen state by comparing the discharge value measured in step (a) and the calculated value of step (c) with a table value for a reference amount of sintered ore generation amount according to sintered ore emissions; And (e) displaying the screen state and information input to the control unit determined to be connected to the control unit. An emission detection unit for measuring emission of sintered ore discharged from the sintered ore storage hopper; A basis weight measurement unit mounted on the conveying conveyor belt to measure the weight of the sintered ore conveyed when the discharged sintered ore is separated by the particle size sorting process on the screen and then conveyed by the conveying conveyor belt; A speed detecting unit mounted to the conveying belt to detect the speed of the conveying belt; A calculation unit connected to the basis weight measurement unit and the speed detection unit to derive the amount of generated sintered ore by receiving a weight measurement value and a speed measurement value; A control unit for determining a screen state by comparing data of the calculation unit and the emission detection unit with a table value of a reference generation amount of sintered ore according to the discharge amount of sintered ore; And And a display unit connected to the control unit to display the determined screen state and information input to the control unit. The method of claim 2, The basis weight measuring unit is a weight frame located between the main frame of the conveying belt; A roller device mounted to the weight frame to mount a belt; Load cells installed on both sides of the left and right pairs so as to be deflected outwardly on an upper end of a horizontal extension of the weight frame; And Sintered ore screen diagnostic apparatus comprising a weight detector for detecting the weight in response to the signal of the load cell. The method of claim 2, The speed detecting unit includes a roller rotating in contact with a rear surface of the belt to detect a speed of the conveying belt; Sintered ore screen diagnostic device comprising a speed detector for detecting the belt speed by detecting the rotational speed of the roller.