KR100825327B1 - Control system for real time cleaning of ore sorting screen for blast furnace - Google Patents

Abstract

The present invention relates to a blast furnace raw material screen basis weight and real-time cleaning control device, and automatically controls the opening and closing of the gate of the raw material storage tank during the continuous blast furnace operation according to the appropriate cleaning time set amount of the iron ore charged into the blast furnace to produce molten iron Automatically cleans and removes the basis weight of charged iron ore and the screen clogging of screen mesh, and suppresses blast furnace spectroscopy to improve aging and improve screen screening efficiency of blast furnace raw material screen and real-time cleaning control device. It is about.

According to the present invention, an opening signal generator (10-3) is provided at the shaft end (10-4) shaft end of the empty gate (10-1) provided in the chute portion of the raw material storage tank, and the analog signal generated by the opening signal transmitter is digital. A gate control amount measuring unit provided with an opening degree converter 80 capable of converting the signal into a signal and measuring the position of the gate according to the rotational amount of the axis;

The opening and closing amounts of the gates measured above are transmitted, the blast furnace process computer 50 is installed for data management, the electrical signal controllers 60 are linked to each other for electrical signal storage and automatic cleaning control, and all the control quantities thereof are linked. A CRT 100 configured to be recognized at a glance;

An operation method selection unit of the granularity sorter for selecting whether to perform the entire cleaning at the time of the selection of the particle size selector for setting the automatic cleaning control amount in the CRT 100 screen or to perform the cleaning alone;

A cleaning time setting unit configured to set the cleaning time of the grain size sorter to a predetermined range;

A cleaning cycle setting unit for setting a predetermined time range in which cleaning is to be performed during normal operation;

A cleaning control amount setting unit comprising a cleaning number selection unit of the particle size selector which specifies whether to clean the odd-numbered or even-numbered tanks first among the particle size selectors;

It provides a blast furnace raw material screen basis weight and real-time cleaning control device composed of an automatic control amount data input unit in which a keyboard 61 for setting the target amount directly by the operator to set the control amount.

Description

Blast Furnace Raw Material Screen Basis and Real-time Cleaning Control Device {CONTROL SYSTEM FOR REAL TIME CLEANING OF ORE SORTING SCREEN FOR BLAST FURNACE}

1 is an overall process diagram showing a raw material transport flow of blast furnace;

2 is a schematic diagram of a screen cleaning control system of a particle size sorter according to the present invention;

3 is a CRT configuration diagram according to the screen cleaning control of the present invention;

4 is a screen cleaning control system control pro chart of the present invention.

Explanation of symbols on main parts of drawing

10: raw material storage tank (BIN)

10-1: BIN GATE

10-2: BIN GATE MOTOR

10-3: empty dog opener, 10-4: bearing

20: SCREEN

30: iron ore basis weight hopper (WELGHING HOPPER)

40: blast furnace

50: PROCESS COMPUTER

60: Electric Signal Controller (ECC)

60-1: Driver Input Keyboard                 

70: PLC (PROGRAM LOGIC CONTROLLER)

80: BIN ANGLE CONVERTER

90: Cleaning start butt of grain size sorter

90-1: Cleaning stop button of particle size sorter

93: particle size selector 94: cleaning time setting unit

95: cleaning cycle selector 96: cleaning number selector

97: Exhalation display button of particle size selector 100: CRT screen

The present invention relates to a blast furnace raw material screen basis weight and a real-time cleaning control device, and more specifically, to automatically produce a bin (BIN) during the continuous operation of the blast furnace according to the appropriate cleaning time setting amount for a certain period of iron ore charged to the blast furnace to produce molten iron Automatic screen cleaning system to improve the aging and improve the efficiency of the screen by suppressing the blast furnace spectral injection by periodically removing the basis weight of iron ore and screen screen blockage light used as raw materials in the blast furnace will be.

Figure 1 shows the overall process showing the fuel transport flow of a typical blast furnace.

In general, the blast furnace uses eight sinter bins (BIN) 10 and eight screens 20 for screening iron ores, respectively, in order to load sintered ore (iron ore) of 5 to 50 mm in size, and the driver uses an electric signal controller (ECC). Manually set the empty gates (10-1) in the (ELETRICAL COMMUNICATION CONTROLLER) (60) to sort and weigh iron ore, and also remove the fixed or stuck particles stuck to the upper and lower screen mat mesh of the particle size sorter. In order to do this, the continuous gravimetric work of the particle size sorter is stopped, and the driver manually closes the bin gate 10-1 to clean the screen manually.

If you do not do this, the ore to be injected into the blast furnace is not properly classified into alleles and small particles, so that a lot of spectroscopy is introduced into the furnace, which makes the operation of the blast furnace very difficult.

In the conventional blast furnace operation, however, there are the following problems.

When the bin gate 10-1 is excessively opened, a large amount of iron ore is screened at the screen 20, so that the screen efficiency is lowered, so that the iron ore smaller than the size of the iron ore required by the blast furnace 40 is blast furnace 40 ), Which is a problem in the production of molten iron due to air permeability in the blast furnace, causing a decrease in production, and the screen mat (MAT) is made of urethane material and at the same time weighing a large amount of iron ore at once Premature wear and damage can result in loss of screen function and ultimately prevent iron ore from being screened, or iron ore escapes between the dropped screen mats due to mat dropout, causing excessive load on the belt conveyor that transports the screened powder. It will not be able to weigh iron ore and therefore will not load iron ore into the blast furnace. Eventually there is a problem you need to stop the operation, similar to the above problems, even if they do not mesh screen blocked by sticking an optical particle size selection is not properly occurs.

In addition, in the related art, since the above operation is performed according to a setting value selected by the driver, efficient screen operation cannot be performed, and thus there is a problem in that uniform iron ore is not charged into the blast furnace.

The present invention has been made in order to solve the above-mentioned conventional problems, when the desired basis value is inputted from the central cab, the gate is automatically opened and closed according to the default value input to the blast furnace process computer. Bingate is operated again by comparing the amount of value with actual basis weight value. Also, if the driver sets the screen auto cleaning time for screen efficiency, the screen can be automatically cleaned according to the set time so that a certain amount of iron ore can be charged into the blast furnace. The purpose is to provide a control device that enables stable blast furnace operation, reduced screen load and efficient screen management.

In order to achieve the above object, the present invention controls the iron ore empty gate in real time by the periodic time of raw material basis weight in the particle size sorter during normal operation of the blast furnace, and then adjusts the amount of ore. It provides a control system configured to remove the fixed light of the particle size sorter and to clean the mesh trapped light by irregularly operating the ore stuck in the.

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

Figure 2 shows the configuration of the screen cleaning control system of the particle size sorter according to the present invention.

The present invention provides an analogue generating device (10-3) provided at the shaft end (10-4) shaft end of the empty gate (10-1) provided in the chute portion of the raw material storage tank, the analogue generated in the dog opening transmitter A gate control amount measuring unit for installing an opening degree converter 80 capable of converting the signal into a digital signal and measuring the position of the gate according to the rotational amount of the number of axes;

The opening and closing amount of the gate measured above is transmitted, the blast furnace process computer 50 for data management is installed, and the electrical signal controller 60 is linked to each other for electrical signal storage and automatic cleaning control. And CRT (100) configured to recognize at a glance;

In the screen of the CRT 100, a selection of a particle size selector that can set an automatic cleaning control amount is selected whether to clean the entire entire number from # 1 to # 8 at once or to perform cleaning alone (SINGLE). An operation method selector of the particle size selector;

A cleaning cycle setting unit for setting how much cleaning is to be performed during normal operation from at least 1 hour to 4 hours;

A cleaning control amount setting unit comprising a cleaning number selection unit of the particle size selector which specifies whether the odd-numbered or even-numbered tanks are to be selected first from the # 1 to # 8 sets of the particle size selector;

The control amount is composed of an automatic control amount data input unit in which an operator is provided with a keyboard 61 for directly setting a target amount.                     

Referring to FIG. 3, the basis weight value of the driver's iron ore is set in the CRT 100 for cleaning the granularity sorter.

The CRT 100 first determines whether to set the cleaning mode of the particle size selector to all (All Selection Mode) or to set a specific particle size selector to single mode (Single Mode). The screen cleaning time is preferably set to about 3 to 5 minutes in the All Selection Mode.

The reason is that the operation of a large number of particle size separators is caused by an environmental pollution problem when the particle ores and spectroscopy generated during the cleaning of the particle size separators are separated and the belts are transported to increase the amount of transport of the belts.

It is preferable to set it within 10 minutes in single mode. The reason is that the amount of ore to be put into the blast furnace must be weighed in advance so that raw materials can be continuously supplied to the blast furnace. It will fall, which will cause yellowing relief.

The screen cleaning period of the particle size selector is set by the operator judging the time interval according to the ventilation resistance index k of the yellow in the full mode or the single mode.

For example, if the ventilation resistance index (k) in the furnace is operating at a value of 2.7 or more, the screen cleaning cycle itself automatically starts an idle idle system that shakes off the ore or spectra blocked at least once every 2 hours. Respond in advance to operational abnormalities.                     

The screen cleaning selection particle size selector can be designated by a single group, and as shown in Fig. 3, 1, 3, 5, 7 odd numbers can be selected.

When the operator sees the CRT (100) screen and inputs the basis weight setting value with the keyboard 61 in the central cab, it is transmitted to the blast furnace process computer 50 and the bin (BIN) opening degree is set according to the basic basis weight database value (Table 1). Finding the value and sending the signal back to the PLC 70 from the electric signal controller 60, the PI 70 outputs a signal to the frequency conversion device 80, and accordingly the basis weight set by the driver By converting the empty opening degree according to the value 4 ~ 20mmA, the empty gate motor 10-2 is operated to open or close by the opening value of the setting value to maintain the proper opening degree and return the value to the electric signal controller again. If it is not changed, the value is continuously maintained, and is stored in the electric signal controller 60 and displayed on the cab CRT screen.

Table 1

Basis weight value (T / H) BIN GATE ANGLE (%) 200 20 250 25 300 30 350 35 400 40 450 45 500 50

In addition, if the set value is not changed, the screen automatic cleaning system is set, the electric signal controller finds the set value, reads the set value, and sends the signal to the PSI 70. Closes and performs idling cleaning for a set time, and a few seconds before the end of the cleaning time, the existing empty gates stored in the electric signal controller 60 are opened, and when the screen stops, the electric signal controller 60 is stored and the cab CRT 100 It is displayed on the screen, and the value is maintained, and when the driver sets the value again, it is controlled sequentially.

The following equations are related control equations.

<Controlled Expression 1>

Basis weight per hour (T / H) calculation formula: Basis weight value (Ton) ÷ Basis weight time (Sec) × 3600 (Sec)

(Example) 20 ÷ 157 × 3600 = 458.6T / H

<Control type 2>

Calculation of basis weight value according to frequency: Maximum basis weight (Ton) × set frequency (%) ÷ maximum frequency

(Example) 1000TON × 50 ÷ 100 = 500TON

In the central cab, when the driver inputs a set value to be weighed by the keyboard 60-1 according to the blast furnace operation conditions and the characteristics of the sintered ore (iron ore), the basis weight control system is preferentially operated.

After the basis weight is completed, the screen automatic cleaning system will be tracked and screen cleaning will be performed if screen cleaning interval and cleaning time are set.

When the basis weight control and screen automatic cleaning control system is set in the electric signal controller 60 and downloaded (DOWNLOAD), it is transferred to the process computer 50 and the signal is output to the electric signal controller 60. By converting the calculated value set by the opening degree converter 80 and operating the gate gate motor 10-2 according to the above control equations 1 and 2, the bin gate is opened or closed by the opening degree of the set value to maintain the appropriate opening degree. It is then connected to the process computer 50 and sends a signal to the controller 60 in accordance with the database table 90 and the controller 60 is adapted to maintain its values in the process computer 50.

Conventional bin gate (10-1) adjustment is a basis weight by the driver arbitrarily adjusted by the experience value, the present invention is to be automatically controlled when input the basis weight value with the operator operation keyboard of the controller 60 in the central cab, and In the related art, the driver manually cleans the screen. However, in the present invention, when the setting cycle and time are input as described above, the screen can be automatically cleaned.

4 is an operation flowchart of the screen basis weight and automatic cleaning control system of the present invention, thereby explaining the operation flow of the present invention.

When the driver sees the screen 60-2 of the electric signal controller 60 and inputs the basis weight value through the operation keyboard 60-1, the driver reads the basic setting database value stored in the register (REGISTER) of the process computer 50. It finds the empty opening according to the value and selects and weighs the iron ore basis weight of the program logic controller (PROGRAM LOGIC CONTROLLER).

In addition, when the cleaning cycle and time is read to the electric signal controller 60, and the data is transmitted to the PSI 70, the current frequency opening stored in the electric signal controller 60 is read and pulled to the frequency opening controller (converter) 80. When converting to FULL CLOSE (4mmA), the opening degree is full cross and the screen is idle running for a set time without iron ore on the screen, and the screen is idled and cleaned from the PI 70 at the time count. By reading the opening degree just before the end of the basis weight stored in the electric signal controller 60 by 5 seconds before the set time, the empty gate is opened. Accordingly, the cleaning setting time is terminated and the screen is stopped and the automatic cleaning control system operation ends.

The present invention described above has the following effects as compared to the conventional basis weight method and screen cleaning method.

First, the driver conventionally sets the free gates at the controller arbitrarily and checks the actual basis value by checking the iron ore and sets the free gate again, and the cycle takes about 10 minutes or more. If not, there is a problem that you can not weigh the desired basis value, but in the present invention, the gate is automatically controlled according to the basis weight set basically, and again by comparing the set basis value with the actual basis value to automatically reduce the deviation There is an effect that can accurately weigh the required basis weight.

Second, the screen efficiency is increased by automatically cleaning the screen according to the set time and period, and the raw material of uniform particle size required in the blast furnace is charged to improve the blast furnace ventilation, thereby contributing to the operation of the blast furnace and productivity improvement. .

Third, when the bin gate is opened excessively, there is a problem that the production of waste water is reduced due to the operation delay or the rest of the equipment by causing an excessive load on the screen and the transfer vent conveyor, but in the present invention, the bin is automatically set when the basis weight is set. By controlling the gate, it reduces the overload of the facility and automatically cleans the screen to extend the life of the facility and to insert certain iron ore into the blast furnace, thereby preventing the adverse effects on the blast furnace operation.

Fourth, in the conventional art, the gate is arbitrarily set and operated by the driver, but in the present invention, the gate is automatically controlled based on the basis weight value set in the process computer, and the screen is also cleaned by the driver. According to the present invention, cleaning is automatically controlled by a series of programs according to a set cycle and time, thereby reducing practical workload, protecting equipment, and improving blast furnace aging.

Claims (2)

A dog opening transmitter 10-3 is provided at the shaft end 10-4 shaft end of the empty gate 10-1 provided in the chute portion of the raw material storage tank, and the analog signal generated by the dog opening transmitter is converted into a digital signal. A gate control amount measuring unit provided with an opening degree converter 80 capable of measuring the position of the gate according to the rotational amount of the axis; The opening and closing amounts of the gates measured above are transmitted, the blast furnace process computer 50 is installed for data management, the electrical signal controllers 60 are linked to each other for electrical signal storage and automatic cleaning control, and all the control quantities thereof are linked. A CRT 100 configured to be recognized at a glance; An operation method selection unit of the granularity sorter for selecting whether to perform the entire cleaning at the time of the selection of the particle size selector for setting the automatic cleaning control amount in the CRT 100 screen or to perform the cleaning alone; A cleaning time setting unit for setting a cleaning time of the particle size selector; A cleaning cycle setting unit for setting a cleaning cycle during normal operation; A cleaning control amount setting unit comprising a cleaning number selection unit of the particle size selector which specifies whether to clean the odd-numbered or even-numbered tanks first among the particle size selectors; The blast furnace raw material screen basis weight and real-time cleaning control device consisting of an automatic control amount data input unit is provided with a keyboard 61 for setting the control amount directly by the operator. 2. The apparatus of claim 1, wherein the apparatus sets the basis weight based on the value set in the process computer 50 when the driver sets the basis weight value in the electric signal controller 60 in the iron ore basis weight control. The basis weight is continuously controlled by comparing the values, and the default setting value is [Basic value per hour (T / H) calculation formula: Basis value (Ton) ÷ Basis time (Sec) × 3600 (Sec)] Basis value calculation formula according to opening degree: Blast raw material screen basis weight and real-time cleaning control device, which is obtained and controlled by the control formula of [Maximum basis weight value (Ton) × set opening degree (%) ÷ maximum opening degree].

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