KR100423453B1 - Apparatus for controlling charging nut-coke in blast furnace - Google Patents

Abstract

The present invention relates to a blast furnace nut coke charging control device, the present invention is to measure the gas temperature and concentration in the furnace for each position installed gas temperature and concentration sensor unit; An in-vehicle air permeability analysis device (70) for analyzing a blast furnace air condition based on the temperature and concentration from the gas temperature and concentration sensor unit to determine a permeability failure position for nut coke charging; Determine the nut coke charging notch corresponding to the poor breathability position from the in-vehicle ventilation analysis device 70, control the charging of the nut coke for this charging notch, and confirm the nut coke charging position by receiving the measured charging position information. A central control unit 80 to more accurately control the next nut coke charging; A basis weight hopper discharge control unit 40 for controlling the discharge of nut coke by determining a discharge time for charging coke in the crystal charging notch under the control of the central control unit 80; A steel ball input device 61 for introducing a steel ball before and after the basis weight of the nut coke discharged by the basis weight hopper discharge control unit 40 under the control of the central control unit 80, and the steel ball input device 61 A nut coke position control unit 60 including an iron detecting device 62 for detecting a charging position when the steel ball is charged into the blast furnace, and providing the loaded nut coke charging position information to the central control unit 80; According to the present invention configured as described above, by grasping the position of the ventilation aeration in the furnace based on the charging distribution and the gas flow to automatically control the charging of the nut coke at this poor ventilation position, and confirm the charging position of the nut coke In this way, by improving the ventilation in the furnace to keep the aging stable, it is possible to achieve a reduction in production costs and an improvement in productivity.

Description

Nut coke charging controller in blast furnace {APPARATUS FOR CONTROLLING CHARGING NUT-COKE IN BLAST FURNACE}

The present invention relates to an in-blast furnace nut coke charging control device, in particular, grasps the location of aeration in the furnace based on the charging distribution and gas flow to automatically control the charging of the nut coke at this poor breathing position, the charging of the nut coke The present invention relates to an in-blast furnace nut coke charging control device capable of achieving a reduction in production cost and an improvement in productivity by confirming a location and improving the ventilation in the furnace so as to keep the yellowing stable.

Figure 1 is a conventional blast furnace loading process, Figure 2 is a nut coke discharge of Figure 1, Figure 3 is a conventional gearbox (gear / box) notch (notch) and the distribution chart of the type by furnace type.

1 and 2, a conventional nut coke (hereinafter referred to as "nut coke") charging is stored in a raw material bin and then weighed by a basis weight hopper through a basis weight feeder 20-3. When the raw material is weighed in 8 basis weight hoppers 20-4, 4 out of 8 hoppers are arranged in 2 tanks, and the discharge order is sequentially discharged to 2 ferrous surge hoppers. . At this time, the nut coke is discharged so that the nut coke is stored at the bottom of the first hopper (30-3) of the relay tank. It is transferred to the first hopper.

The nut coke and ore stored in the relay tank come out from the blast furnace when batch call (# 3) (30-3) stored with the nut coke is discharged first and imported into the lower hopper, and then the relay tank # 2 ( 30-4) is discharged and imported on # 1 trillion ore, raw material stored in the top hopper 11 is when the blast furnace charging level is lowered, first, the nut coke stored in the bottom of the hopper as shown in Figure 3, the middle of the blast furnace It is charged in the department to improve breathability.

However, the nut coke charging method has some problems. Firstly, the charging of the coke of the nut is to be made in the furnace wall and the middle layer, but the nut coke stored in the raw material # 8 is discharged to the front of the belt due to the lack of interval time and the small amount of nut coke when discharged. Nut coke is discharged by mixing with three raw materials, and a small amount of nut coke is charged from the furnace wall to the middle part, thereby reducing the middle part improvement effect required by the driver.

Second, since the charging of nut coke does not take into account the operating conditions inside the blast furnace, there is no control function for each part of the middle of the blast furnace, and it is not possible to analyze at which point and which point the nut coke is charged. There is no effective control.

In the present invention, in the blast furnace, as the ore / cokes ratio is increased during the high pulverized coal injection, the in-house pressure loss increases as the thickness of the coke slit of the fusion zone under the blast furnace decreases. Increasing the pressure loss in the furnace increases wind pressure and reduces the wind or light. To improve this, 15 ~ 25mm of nut coke is mixed with ore and charged in the middle of the hearth, thereby improving ventilation in the furnace.

Therefore, the nut coke charging system simply does not maximize the effect of improving the middle part of the blast furnace desired by the operator by making the condition that the nut coke can enter the furnace wall.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and therefore, an object of the present invention is to grasp the location of aeration in the furnace based on the charge distribution and gas flow to automatically control the charging of nut coke at this location of ventilation. By checking the charging position of the nut coke, to improve the ventilation in the furnace to maintain the rust stable, to provide an in-blast furnace nut coke charging control device that can achieve a reduction in production costs and productivity.

1 is a conventional blast furnace loading process chart.

Figure 2 is a nut coke discharge of Figure 1;

Figure 3 is a conventional gearbox (gear / box) notch (notch) and the type of distribution in the furnace by type.

Figure 4 is a block diagram of a blast furnace nut coke charging control apparatus according to the present invention.

Figure 5 is a block diagram of a nut coke steel ball input and hopper discharge control device according to the present invention.

6 is a flowchart of the operation of the device according to the invention.

7 is a nut coke discharge in accordance with the present invention.

Explanation of symbols on the main parts of the drawings

25: hopper discharge control device 26: reduction gear

29a, 29b: limit switch 29c: open meter

40: basis weight hopper discharge control unit 41: discharge device interval control device

42: gate control device 45: nut coke

51: coke charging region 52: nut coke + allele charge region

53: small particle charging area 54: blast furnace wall

55: middle part of blast furnace 56: central part of blast furnace

60: nut coke position control unit 61: steel ball input device

61a, 61b: steel ball 62: iron sheet detection device at charging

64: steel ball storage tank 65: steel ball input control device

63: feeder spout iron piece detection device 70: furnace breathable analysis device

71: upper probe 72: ABS probe

73: infrared camera 80: central control unit

As a technical means for achieving the above object of the present invention, the apparatus of the present invention measures the gas temperature and concentration in the furnace by position and installed gas temperature and concentration sensor unit; An in-vehicle air permeability analysis device for analyzing a blast furnace air condition based on the temperature and concentration from the gas temperature and concentration sensor unit to determine a permeable defect position for nut coke charging; The nut coke charging notch corresponding to the poor breathability position from the in-vehicle breathability analyzing apparatus is determined, the charging of the nut coke is controlled with respect to the charging notch, and the nut coke charging position is checked by receiving the measured charging position information. A central control for more precise control of the charging of the nut coke; A basis weight hopper discharge control unit for controlling the discharge of the nut coke by determining a discharge time for charging the coke in the decision charging notch under the control of the central control unit; A steel ball input device for inserting a steel ball before and after the basis weight of the nut coke discharged by the basis weight hopper discharge control unit under the control of the central control unit, and the iron ball introduced by the iron ball input device to detect the loading position when the blast furnace is loaded A nut coke position control unit including an apparatus and providing charged nut coke charging position information to the central control unit; Characterized in having a.

Hereinafter, the blast furnace nut coke charging control apparatus according to the present invention will be described in detail with reference to the accompanying drawings. In the drawings referred to in the present invention, components having substantially the same configuration and function will use the same reference numerals.

4 is a configuration diagram of a blast furnace nut coke charging control apparatus according to the present invention, referring to Figure 4, the blast furnace nut coke charging control apparatus according to the present invention by measuring the gas temperature and concentration in the furnace by position An in-vehicle air permeability analyzer 70 for analyzing a blast furnace ventilation condition based on a temperature and concentration sensor unit and a temperature and a concentration from the gas temperature and concentration sensor unit to determine a permeability failure position for nut coke charging; The nut coke charging notch corresponding to the poor breathability position from the analyzer 70 is determined, the charging of the nut coke is controlled for this charging notch, receiving the measured charging position information, and confirming the nut coke charging position. The central control unit 80 more precisely controls the nut coke charging of the coke, and the nose to the crystal charging notch under the control of the central control unit 80. The basis weight hopper discharge control unit 40 for controlling the discharge of the nut coke by determining the discharge time for charging the scoop, and the nut coke discharged by the basis weight hopper discharge control unit 40 under the control of the central control unit 80 The iron ball input device 61 for introducing the iron ball before and after the basis weight of the iron ball, and the iron ball input device by the iron ball input device 61 includes an iron piece detecting device 62 for detecting the charging position when the blast furnace is loaded, the loaded nut coke The nut coke position control unit 60 provides charging position information to the central control unit 80.

The gas temperature and concentration sensor unit includes an upper probe, an ABS probe, and an infrastructure camera installed in the furnace.

The upper pro part 71 is installed at a setting position below the stock level, for example, 4.5M position, and the probe is inserted into the blast furnace in the horizontal direction to be inserted into the charge, so that the pressure and temperature in the blast furnace radius direction are provided. As a facility for detecting the air permeability in the furnace by detecting a, the measured data is sent to the furnace air permeability analysis device (70). The probes 72 are uniformly installed at four intervals of 90 ° in the circumferential direction immediately above the charges, and six temperature detecting tissues are installed at equal intervals in one pro part so that the gas passed from the bottom of the blast furnace is The AV probe installed at the top of the blast furnace charge detects the temperature and is sent to the in-vehicle air permeability analyzer 70. Then, the Infrared camera 73 is installed on the lower side of the blast furnace gearbox to shoot the infrared rays to determine the temperature in the furnace is sent to the breathable analysis device 70.

The in-vehicle air permeability analyzer 70 detects the in-vehicle permeability defects in the current operating situation based on the measurement data from the gas temperature and concentration sensor unit, and sends them to the central control unit 80.

The central control unit 80 determines which tilting notch of the current box that the aeration fault of the current sent from the in-vehicle ventilation analysis device 70 corresponds to the tilting notch of the gearbox, and when the blast furnace loading tilting notch is determined, Calculate how many seconds the nut coke 45 should be charged (7.5 sec / rotation) after loading the ore with reference to the top loading matrix to meet the charging point (if the ore starts charging from 4 notches and the nut coke is If it is to be charged at 5 notch, the ore should be charged 15 seconds after the start of charging and 7.5 sec / rotation × 2 = 15 sec) to analyze the data from the iron detector device 62 installed on the belt conveyor. By giving a command to the raw material basis hopper discharge control unit 40 to control the nut coke discharge timing.

The basis weight hopper discharge control unit 40 controls the discharge and discharge time of the nut coke under the control of the central control unit 80, for this purpose, a hopper discharge control device 25 for controlling the discharge of the nut coke hopper, and 8 It includes a discharge interval control device 41 for adjusting the discharge time to fit the two basis weight hopper to the nut coke discharge position.

The hopper discharge control device 25 is provided with a control plate 28 that moves up and down on the side of the discharge gate, the control plate is attached to both sides of the chain gear, the chain gear is the gear of the drive gear motor 25 When the motor rotates forward and backward, the gate control plate is configured to move up and down. Limit switches 29a and b are installed above and below the gate control plate, and an open meter 29c is installed above the control plate to check the gate opening degree.

The interval control device 41 controls the discharge of eight raw material basis weight hopper, and each hopper receives the nut coke discharge from the load cells (21a, b) when discharged with respect to the nut coke to determine the discharge time of the other hopper discharge This control is used to determine the amount of nut coke to mix with the ore (46, 47, 48) to control when the nut coke enters the blast furnace.

5 is a configuration diagram of a nut coke iron ball input and hopper discharge control device according to the present invention, referring to Figure 5, the nut coke position control device 60 is a steel ball is put in accordance with the control of the central controller (80). Then, the inserted steel balls are detected to detect the nut coke charging position, and the charging position information is provided to the central control unit 80. To perform this, the steel ball feeding device 61 and the iron piece detecting devices 62 and 63 are provided. Consists of.

The iron ball input device 61 is a storage tank 64 for storing a small iron ball on the upper side of the nut coke feeder (20-3) is installed, and a steel ball inlet for inserting the steel ball on the lower side of the reservoir is installed in the lower end of the iron ball input outlet The input control device 65 is attached to the metal ball to control the input. The nut coke iron piece detecting devices 62 and 63 are composed of two pieces of iron piece detecting device 62 and feeder spout iron piece detecting device 63 at a charging ratio.

The loading ratio of the iron piece detection device 62 is installed in the head of the charging case (16) for transporting the raw material from the relay tank to the top, and the iron detection device is installed on the upper and lower belt upper surface. Therefore, by detecting the iron ball of the ore raw material discharged from the relay tank to determine where the nut coke is located in the ore trace (trace) and send it to the central control unit. The feeder spout 63 iron piece detection device is installed on both sides of the lower feeder spout portion of the top loading hopper when the nut coke is charged into the blast furnace when the nut coke is charged by the steel ball (61a) at the starting point of the loading point After grasping and detecting the second entering the iron ball (61b) to determine the nut coke charging completion point, so that the nut coke 45 can know the actual charging notch, this signal is sent to the central control unit (80).

6 is an operational flow diagram of the device according to the invention, and FIG. 7 is a nut coke discharge view according to the invention.

Operation according to the device of the present invention configured as described above will be described in detail below based on the accompanying drawings.

Referring to the operation of the blast furnace nut coke charging control apparatus according to the present invention with reference to Figures 4 to 7, first, the gas temperature and concentration sensor unit measures the temperature and gas in the blast furnace to transmit to the furnace ventilation analysis device This will be described in detail below.

First, the data related to the in-vehicle air permeability of the upper probe measuring device 71, the AV probe 72 measuring device, and the infrared camera measuring device 73 of the gas temperature and concentration sensor unit of FIG. That is, the upper probe measuring device 71 is inserted into the blast furnace in the horizontal direction and analyzes the temperature and CO, CO2 gas at 10 points in the furnace and sends it to the central control unit 80. In addition, four probe probes 72 are installed at equal intervals directly in the furnace contents, and six thermometers installed at each pro unit detect the temperature at the top of the blast furnace and send the same to the furnace breathability analyzer. Finally, the Infrared camera measuring device 73 detects infrared rays from the blast furnace upper side and the entire blast furnace top temperature distribution and transmits the temperature distribution for each part by color to the furnace breathable analyzer 70.

At this time, the furnace breathability analysis device 70 analyzes the data received from the sensor included in the gas temperature and concentration sensor unit, that is, based on the temperature of the furnace parts raised from the offer probe 71, CO, CO2 gas based When the temperature is high and the carbon monoxide (CO) temperature is high, the gas flow is recognized as a lot of parts and analyzed by parts to find the part with the least gas flow to analyze the poorly ventilated points. In addition, by analyzing the temperature distribution raised from the four ave pro part measuring device 72 to analyze the gas air permeability by subdividing the temperature of the center, middle, and peripheral parts. And the last Infrared camera measuring device (73) receives the low temperature part, analyzes the average temperature around the center and surroundings, and finds a location with poor ventilation by finding a temperature lower than the average temperature.

In such a breathable analysis apparatus, three pieces of data are comprehensively analyzed to find a location in the blast furnace that is inferior in breathability, and the most breathable part is sent to the central control unit 80 (S61 in FIG. 6 above).

At this time, the central controller 80 calculates which notch the gearbox tilting corresponds to the part raised from the breathable analysis device 70 to determine which nut coke should be finally loaded in the notch of the gearbox. (S62 of FIG. 6 above). As such, when the notch in the blast furnace nut coke charging notch is determined, the control command is issued to the basis weight hopper discharge control unit 40 and the nut coke position control unit 60 so that the nut coke fits into the notch charged in the blast furnace.

The basis weight hopper discharge control unit 40 is the nut coke immediately before the basis weight start, that is emptying the nut coke hopper (above S63 of Fig. 6), at the same time to give a command to the metal ball input device to insert the steel ball (steel ball 61a) When the steel balls are introduced in this way, when the nut coke starts the basis weight and completes the basis weight by the set amount, the steel balls 61b are input again by instructing the iron ball input device (S64 in FIG. 6 above). After the iron balls have been added, the required ore will be weighed and ready for discharge.

At this time, when the basis weight discharge command comes from the basis weight hopper discharge control unit 40, the discharge interval control device operates the nut coke basis weight hopper gate 42 to calculate the required nut coke charging time in the hopper to open the gate opening to discharge the nut coke. When the discharge is started, the discharge interval control device calculates the discharge time of the nut coke to determine the discharge time of the next ore hopper to perform the discharge sequentially (S65 in FIG. 6 above).

As such, the nut coke and the ore are discharged and temporarily stored in the relay tank hopper, and when the batch call command is issued from the hopper, the ore is sequentially discharged from the relay tanks (30-3, 30-4). At this time, the nut coke is discharged from the hopper No. 1 of relay tank No. 30-3. Since the nut coke hopper is discharged first when discharged from the raw material hopper, the nut coke is discharged initially and gradually mixed with other raw materials. The primary iron ball 61a is discharged and the secondary iron ball 61b is discharged at the end of nut coke discharge (S66 in FIG. 6 above).

When the nut coke and the ore is mixed and discharged in the relay bath, the nut coke position control unit 60 first detects the nut coke position in the iron piece detector 62 installed at the upper point at the charging time in order to determine the nut coke position. That is, the nut coke detects the primary iron ball 61a first when the ore and the discharge, and then detects the secondary iron ball 61b, and calculates the distance between the primary and secondary iron balls and sends it to the central control unit (see FIG. 6 above). S67).

When the ore including nut coke is imported and charged into the top hopper 11 and the charging is made, the starter notch in which the nut coke is charged from the feeder spout iron piece detector 63 to the primary iron ball 61a is identified and the secondary iron ball 61b is loaded. ), The notch of the nut coke is completed and sent to the central control unit 80 (the above is S68 of FIG. 6).

When the nut coke charging point coincides with the nut coke charged notch sent from the furnace air permeability detection device, the central control unit 80 maintains the current discharge system and performs feedback control while grasping the improvement of the air permeability in the furnace. Keep it.

If there is an error in the nut coke loading position, command the raw material hopper discharge controller to adjust the discharge and discharge interval time so that the nut coke is discharged at the required position.The result is correlated with the data detected by the nut coke position controller. Finally, through the feed back, the nut coke charging position is charged to the corresponding notch in the blast furnace.

According to the present invention as described above, in the furnace air permeability analysis device to identify the in-vent ventilation defects to control the nut coke and other ore discharge hopper interval time through the basis weight hopper discharge control unit so as to load the nut coke in the corresponding area and discharge the nut coke Nut coke is charged at the optimum position by checking the nut coke, and the nut coke position detection device is used to check whether the nut coke is correctly charged at the poor ventilation location. Do it.

In addition, this cycle is continuously performed to continuously monitor the defective ventilation in the furnace, and the nut coke is charged at the optimum position, and the nut coke is charged at the poor ventilation place to improve the breathability to maintain the stable yellowing and unstable. There is a practical effect in solving the problem that the charter unit unit rises due to the increase in fuel cost caused by the high pisias, which reduces productivity and decreases the sensation.

The above description is only a description of one embodiment of the present invention, the present invention is capable of various changes and modifications within the scope of the configuration.

Claims (3)

A gas temperature and concentration sensor unit configured to measure gas temperature and concentration in the furnace for each location; An in-vehicle air permeability analysis device (70) for analyzing a blast furnace air condition based on the temperature and concentration from the gas temperature and concentration sensor unit to determine a permeability failure position for nut coke charging; Determine the nut coke charging notch corresponding to the poor breathability position from the in-vehicle ventilation analysis device 70, control the charging of the nut coke for this charging notch, and confirm the nut coke charging position by receiving the measured charging position information. A central control unit 80 to more accurately control the next nut coke charging; A basis weight hopper discharge control unit 40 for controlling the discharge of nut coke by determining a discharge time for charging coke in the crystal charging notch under the control of the central control unit 80; A steel ball input device 61 for introducing a steel ball before and after the basis weight of the nut coke discharged by the basis weight hopper discharge control unit 40 under the control of the central control unit 80, and the steel ball input device 61 A nut coke position control unit 60 including an iron detecting device 62 for detecting a charging position when the steel ball is charged into the blast furnace, and providing the loaded nut coke charging position information to the central control unit 80; Furnace nut coke charging control device characterized in that it comprises a. According to claim 1, wherein the gas temperature and concentration sensor unit An upper pro part 71 installed at a set position below a stock level, the probe being inserted into the blast furnace in a horizontal direction to be inserted into the charge to detect pressure and temperature in the blast furnace radius direction; The plural number is uniformly installed at the set angular intervals in the circumferential direction immediately above the charge, and each pro part is provided with a plurality of temperature detecting tis at equal intervals so that the gas passed from the bottom of the blast furnace is installed on the blast furnace. The probe probe 72 in which a probe detects a temperature; Intra-furnace nut coke charging control device comprising ;; the Infrared camera (73) is installed on the lower side of the gearbox to shoot infrared rays to measure the temperature in the furnace. The steel ball input device of the nut coke position control unit 60 according to claim 1 A nut coke feeder 20-3 is installed at an upper side to store the small metal ball storage tank 64; A steel ball inlet for introducing a steel ball to the lower side of the reservoir (64); Includes; the input control device 65 is installed at the lower end of the steel ball inlet for controlling the introduction of the steel ball; The iron piece detecting device A charging unit (62) installed at the charging unit (16) head portion for transporting raw materials from the relay tank to the top and installed at the upper and lower parts of the belt; In-blast furnace nut coke charging control device comprising ;; feeder spout (63) iron piece detection device provided on both sides of the lower feeder spout portion of the top loading hopper.