JPS60110820A - Device for monitoring body of continuous copper making furnace - Google Patents

Abstract

PURPOSE:To obtain the balance in the life of three furnaces and to stabilize the entire part of a process for production by comparing the change of the temp. with time in a smelting furnace, slag cleaning furnace and blister copper producing furnace of a process for producing blister copper from the concentrate of copper with the past records and controlling the values to an adequate value when an abnormal value is discovered. CONSTITUTION:Copper concentrate, flux, fuel, air and the matte A from a blister copper producing furnace 3 are charged into a smelting furnace 1 and the matte and slag of copper are produced. The matte and slag of the copper are supplied into a slag cleaning furnace 2 where the matte and the slag are heated by the electricity supplied from an electrode 5 and are separated by specific gravity. The copper matte is fed to the furnace 3 where air, flux, etc. are blown through a lance 6 to oxidize the Fe and S in the matte. The Fe and S are returned as slag A to the smelting furnace and the blister copper is produced. Many thermometers are attached to each furnace in this stage and the graph of the change of the temp. in each furnace with time based on the past records and the temp. value measured during operation are compared upon lapse of time by which the change in the temp. of the furnace bodies is adequately monitored and the quick remedy is made for the abnormal value. The life of the furnaces is thus extended and the process is stabilized.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a monitoring device for a furnace body in a continuous steelmaking furnace.

As shown in Fig. 1, the continuous steelmaking furnace consists of a smelting furnace 1, a smelting furnace 2, and a blister producing furnace 3, and produces copper concentrate through a series of smelting, separation, and smelting steps. It produces continuously from copper to blister copper. These continuous steelmaking furnaces are attracting attention as low-pollution, energy-saving steelmaking furnaces with simple equipment, low construction costs, high exhaust gas of 8,028 degrees Celsius, and minimal smoke leakage.

First, an example of a continuous steel making furnace will be briefly explained based on Figure 1.

In the first smelting process, the reaction product of the smelting furnace 1 is obtained by appropriately blending fuel air with melted raw materials mainly composed of ore and a solvent to a proportion that meets preset reaction conditions. A predetermined supply amount per unit time is directly and continuously charged into a certain solution from the lance 4, and melted to generate stiffness and loose copper, which are also generated in the blister production furnace 3 in the subsequent process. By repeatedly assimilating and pulverizing the heat, it is blown substantially continuously into the melt in the smelting furnace 1 (indicated by arrow A in FIG. 1), and most of the copper contained in the medium is removed. Let it be absorbed by the leather. [Next, in the second separation step, the entire amount of the product in the smelting step is sent to the smelting furnace 2, where the electrodes 5 are used to heat and keep warm, and they are separated based on the difference in specific gravity. In addition, the third smelting process [in the culm, minutes!
The steel from the first step is continuously sent to the blister copper production furnace 3, where it is charged through the lance 6 with an appropriate mixture of air, solvent, and cold copper, and copper is produced by the oxidation reaction of iron and sulfur in the and the above-mentioned repeated cherry blossoms are continuously generated.

By the way, one of the features of a continuous steelmaking furnace is Lansing 1.
ffl 4R is a process in which ore, solvent, fuel, etc. are blown into the melt at a high speed of about 150 m/s along with oxygen-enriched air through a lance 4 inserted vertically into the furnace from the ceiling of the melting furnace 1. This allows for instant melting, resulting in advantages such as high reaction efficiency, low fuel consumption, downsizing of the furnace, and high 5021 IJ degree exhaust gas.

In recent years, the durability of continuous steelmaking furnaces has been greatly improved by installing water-cooled jackets, and by monitoring the temperature, expansion, etc. of the furnace material, it is possible to monitor the condition of refractories, jackets, etc. It is now possible to quickly set the temperature and prevent troubles caused by abnormalities, and is also useful for temperature rises after furnace repairs and heat retention during constant boiler inspections.
It has also become possible to grasp important points such as whether the furnace body is contracting and expanding normally and whether local heating is occurring due to fire.

Conventionally, such monitoring of the furnace body has been carried out using multi-point temperature recorders or indicators, and these temperature recorders and indicators are used for each of the melting furnace, smelting furnace, and blister manufacturing furnace. It simply recorded and displayed the measurement results at multiple locations on the furnace body. Therefore, it was difficult to determine the relationship between the conditions of the three furnace bodies from the measurement results. By the way, since a continuous copper furnace performs a series of functions by the cooperation of three furnaces, the lifespan of these three furnace bodies is determined by the length of the long life. It is necessary to balance the lifespan of In this respect, the above measurement results cannot necessarily be said to be effectively utilized.

This invention has been made in consideration of the above circumstances, and includes transmitting temperature measurement signals from multiple locations of each furnace body of a melting furnace, a wrought fireplace, and a blister producing furnace to one location and storing them there. Then, by displaying the stored data in a graph set for a long time as a curve showing the change in temperature over time, as the time represented by the unit scale of time qih goes back in the past, Within the time axis of length, C1 represents the continuous temperature change at the door over a long period of time, and in the time domain close to the current time, particularly detailed temperature changes are shown in Table 4, making the temperature change of the furnace body extremely appropriate. From this, it is possible to properly grasp the status of the three reactors, and match the one with a short lifespan with the one with a long lifespan among the three reactor bodies. It provides a monitoring device for the reactor body in order to maintain the balance of life in these systems.

Hereinafter, embodiments of the present invention will be explained based on FIGS. 2 to 9.

Figure 2 is a system configuration diagram of this device, and 7 in the figure is a C
-C thermocouple, 8 is C-A thermocouple, and 9 is a displacement sensor. The displacement sensor 9 converts the amount of mechanical displacement into an electrical signal, and in this embodiment, a potentiometer as shown in FIG. 3 is used as the displacement sensor 9.

This potentiometer operates on the same principle as a variable resistor, and as the probe 10 moves, the point of contact with the resistance wire 11 moves and its resistance changes. Incidentally, as such a displacement sensor 9, it is also possible to employ, for example, a differential transformer as shown in FIG. This differential transformer is 1
It is composed of a cylindrical coil in which a primary coil 12 and a secondary coil 13 are arranged, and a movable iron core (core) 14' that magnetically couples these primary coil 12 and secondary coil 13,
Secondary coil 1 when movable iron core 14 moves with measuring head
3 taste 1 self 14; 1 ticket ji 41J, \f: red no A hair - ℃
The thermocouple 7 is very strong.
, 8 and the displacement sensor 9 are attached in large numbers at appropriate positions on the hearths of the smelting furnace 1, smelting furnace 2, and blister producing furnace 3, respectively. In this example, the mounting points, that is, m II and displacement measurement points were determined as shown in the table below.

(Left below) S furnace: melting furnace, SH furnace: Renhime furnace, C furnace: blister copper manufacturing furnace, CA: C-A thermocouple, cc: cc thermocouple, PM:
potentiometer.

The measurement points in the above table will be briefly explained below.

In the column of hearth temperature, on the stamp is a point P1 on the upper surface of the stamp layer 16 below the hearth 15 as shown in FIG.
The bottom of the stamp is the point P2 on the bottom of the stamp layer 16.
It is. The porcelain brick temperature is the temperature of the porcelain brick 18 located between the hearth 15 and the side wall 17, B, L di 1! The jacket temperature is the temperature of the water cooling jacket located above the hot water level (pass line) in the furnace. In the 2 degrees column, the bottom of the jacket is the bottom surface of the water-cooled jacket located at the large Jt of the furnace, and the top is the top surface of the water-cooled jacket. The side wall cooling water discharge temperature refers to the temperature of the cooling water discharged from the water cooling jacket provided on the side wall of the furnace after heat absorption.The ceiling jacket cooling water discharge temperature refers to the temperature of the cooling water discharged from the water cooling jacket provided on the side wall of the furnace. /J"-)
The temperature of the cooling water after absorbing heat is 4 degrees. Part 1
1! ! The cold n1 water drainage temperature of Jikame/Kera 1- is the temperature of the cooling water after heat absorption discharged from the water cooling jacket provided in a place other than the side wall of the furnace and Otsuki, such as a gutter that connects the 4th earthen floor. Guaru. The inlet temperature in the column for hearth cooling air is the temperature at the inlet of the air that cools the hearth, and the outlet temperature is the temperature at the outlet of the air after the hearth has been cooled by 11 L. In the column of expansion amount, the term ``daki brick'' refers to the amount of change in wAJ+ between the daki brick 18 and the outer shell iron skin 19, that is, the expansion m of the daki brick 18, as shown in FIG. , shell skin means the amount of change in the distance j2 between the shell skin 19 and its external position I P Z, that is, the amount of expansion of the shell skin 19. These expansion amounts are measured by the displacement sensor 9. In addition, the jacket cooling water supply water temperature is the temperature of the cooling water supplied to the water cooling jackets of each house 1 and 2.3, and in this example, the cooling water to the water cooling jackets of each house 1 and 2.3 is the same. As such, the temperature measurement point is set at one location.

In this way, in this example, there are a total of 283 measurement points for temperature and displacement.

A large number of thermal lightning pairs 7, 8 and displacement sensors 9 at these measurement points are connected to the first, second and third for each furnace 1.2.3.
It is equipped as a group of sensors. In each of these sensor groups, a predetermined number of thermocouples 7.8 and displacement hinges 9 are connected to a multiplexer 20, and each multiplexer 20 is connected to an instrument room R, which will be described later, via a common two-wire transmission line 21. is connected to a central controller 22 of.

The central controller 22 sequentially inputs the detection signals of the sensors connected to each multiplexer +J20 from the common two-wire transmission line 21 in a predetermined order. Therefore, multiplexer 2
0 has an input switching function that scans the sensors connected thereto (, N) in a predetermined order, and the central controller 22 calls each multiplex 1 to 20 in a predetermined order. The called multiplexer 20 is
The sensors connected there are sequentially digitized and their detection signals are sequentially digitized and transmitted from the two-wire communication line 21 to the medium heat controller 22 in the form of a 13-code.

Therefore, in this example, temperature and position detection signals from a total of 2838 locations, including three P1s and 2°3 channels, are sent to the central controller 22 in a predetermined order through the common 2-wire transmission line 21. This is fed back when b<FJ.

In this way, a total of 28
The 4A output signals from an extremely large number of measurement points (as many as three) are sent to the central controller 22 in the control room R.

This is very advantageous in terms of the transmission line 21 and its maintenance, and it is easy to add more measurement points.

The central controller 22 controls each multiplexer 2 as described above.
It requests the transmission of 0 and sends the received data to the alarm display 23. This alarm display 23 displays 11 of the four signals per multiplexer 20.

Further, the data number received by the central υ controller 22 is sent from the computer combiner 24 to the computer main body 25. This computer body 25 $1, Pano J port 26
The central tilllI1 unit 27 stores the data input from the data memory 28 in the data memory 28. At that time, the input data is stored in storage areas that are mapped to correspond to each of the thermocouples 7 and 8 and the displacement sensor 9. The central control unit 27 controls the CP tJ and this CP
It consists of a program memory in which programs used in the U are stored. And, this central control section 27
Various analyzes are performed on the data input from the respective ranges of each unit 1.2.3, and the results are sent to the CR via the boat 29.
1γ display 30 and printer 31.

In addition, such a computer main body 25 is
J-Y is stored on the external magnetic disk 32 as appropriate. In addition, 33 in FIG. 2 is a battery unit.

Next, the specific functions of the central control section 27 will be explained.

First, the central control unit 27 has a function of causing the display 30 to display a display for monitoring measured values, and a function of causing the printer 31 to print a daily report. The former display function is to display numerical values measured by the sensors of each door 1.2.3 on the screen of the display 30 for each furnace 1.2.3. These numbers are updated every predetermined time (for example, 6
updated every minute). When these values reach the warning set value, the value is identified and displayed in red, and when a higher alarm set value is reached, a buzzer sounds. On the other hand, the latter print function is for automatically hard copying the display screen of the display 30 to the printer 31 periodically as a daily report.

Second, the central control unit 27 has a function of displaying on the display 30 a graph of past changes in measured values of any sensor over time upon request for monitoring purposes by the operating operator. FIG. 6 shows an example of a display of changes over time in hearth warm melon in the blister copper producing furnace 3. In the figure, time is plotted on the horizontal axis and temperature is plotted on the vertical axis. The time axis is the past 38 hours,
Then, up to the past two hours, data is taken every 6 minutes, and before that, data is taken roughly every hour.
1. The time represented by the unit scale of this time axis is short for the past two hours, and long for the past two hours. In this way, in this example, the time represented by the unit scale on the time axis differs in two steps.

However, it is also possible to graph the data between ``2'' and ``r'' at necessary intervals. - As an example, Fig. 7 shows the change over time in the hearth temperature in the melting furnace 1 after the start-up of the monitoring system. In this figure, data is collected every day for the last 20 days, and every 4 days before that, and the time axis on the right side of the vertical line in the graph is short, with one division per day. , the time axis on the left side is set to be long, with one division being 4 days.

By the way, in a continuous steelmaking furnace, the temperature detected by each sensor usually changes relatively slowly, but changes relatively rapidly when a problem occurs, so it is necessary to monitor the detected temperature for abnormal changes. In this case, it is better to collect data at small time intervals in the time domain close to the current time, and there is no need to monitor particularly detailed temperature changes in the past beyond a certain point. In this respect, as mentioned above, the time qit of the graph should be set in units [the time represented by one division] for the most recent minutes to obtain detailed data, while for the minutes before that, the time represented by one scale is Obtaining rough data by increasing the time by one hour means that it represents continuous temperature changes over a long period of time within the limited length time axis of the graph, and it also represents the continuous temperature change over a long period of time within the limited time axis of the graph. Particularly fine temperature changes appear in a close time domain. This provides the advantage that temperature changes in the furnace body can be monitored very appropriately.

The central control unit 27 is equipped with the following means to realize the second display function.

That is, the central control section 27 has a time axis setting section and a graph conversion section, and the time axis setting section divides the time axis of the graph to be displayed into predetermined ranges, and converts each divided range into The time represented by the unit scale is set differently. The graph converter displays the data stored in the memory 28, J5, and the external magnetic disk 32 in a graph on the display 30 based on the time axis thus set.

Note that in the display example of the graph described above, the time represented by the unit scale of the time axis differs in two steps, but it may be changed in three or more steps. Furthermore, it is possible to gradually set the time indicated in the unit scale of the time axis to be longer in a stepless manner as one goes back in time. The time axis setting section described above is responsible for setting the time axis.

Next, the third function of the central control section 27 will be explained.

This third function is a function for selectively showing on the display 3o the locations i of the sensors installed in each door 1.2.3. In Figure 8, there is a JH water cooling pipe 1 in the smelting furnace 2! An example of an illustration of the measurement points for the drainage temperature of the jacket is shown.1 In this example, the design of the smelting furnace 2 is displayed, and on the screen, the cooling water flow paths corresponding to each of the measurement points of the drainage temperature of the water cooling jacket are shown. It is designed to be selectively displayed in color. In the state shown in the figure, from the part corresponding to the shaded part in the many water supply ports B, through the water cooling jacket corresponding to the shaded part in the design of Rehime Furnace 2, to the part corresponding to the shaded part in the many drainage EICs. A series of cooling water flow paths leading to the location are selectively displayed. The display contents can be selected by the operator when an abnormality is recognized in the cooling water drainage temperature of the water cooling jacket from the display contents of the display 3o by the first display function of the central control unit 27 described above. For example, this can be done by specifying a number marked for each senna using a keyboard or the like.

By the way, the management of the cooling water drainage temperature of the water cooling jacket is as follows.
In addition to detecting erosion of the water cooling jacket or the surrounding bricks at an early stage, this is extremely important in knowing whether an appropriate amount of cooling water is being secured. The fact that the operator can immediately know the location of the water tank, water supply and drainage pipes, and valves is extremely advantageous in taking prompt safety measures.

The central control unit 27 is equipped with the following means to realize the third display function.

In addition, the central control section 27 has a selection section and a display control section, and the selection section selects a diagram corresponding to the location of the sensor to be displayed based on instructions from the aforementioned keyboard or the like. It is something to do. The display control section searches for a diagram corresponding to the sensor arrangement location selected by the selection section and causes the display 30 to identify and display the diagram. The sensor selected by the selection section is one that is found to be abnormal based on the display content of the display 30 by the first display function of the central control section 27 described above. Therefore, it can be said that the first display function of the central control section 27 functions as a detection means for detecting an abnormality in the detection signal of the sensor.

Although the illustrated example of the interference is for the l11g furnace 2, the smelting furnace 1, J3, and blister copper manufacturing furnace 3 can also be illustrated in the same way. In addition to displaying not only the 1/1 water) relationship of water-cooled jackets 1 to 1, it is also possible to selectively display diagrams for other measurement locations in correspondence with the sensor at that measurement location. be. Also, the selection section in the central control section 27 receives a signal from the detection means for detecting an abnormality in the detection signal of the sensor.
It is also possible to automatically select the 16 selection section when the abnormality is detected at .

Next, the fourth function of the central control section 27 will be explained.

This fourth function calculates the amount of heat from the amount of cooling water flowing into the water cooling jacket and the continuously measured drainage temperature of each water cooling jacket, and calculates the amount of heat for each part of the furnace body 1° 2.3. This function displays the amount of heat dissipated at each time on the display 30 and prints it out on the printer 31. Figure 9 shows the smelting furnace 1.
An example of the display of the endothermic change of the water cooling jacket is shown below.
In this display example, the curve shows the change in the heat absorption amount of the side wall jacket, the curve E shows the change in heat absorption m of the ceiling jacket, and the curve F shows the change in the heat absorption amount of the side wall jacket.
? The curve G represents the change in the amount of heat absorbed by all the jackets in the smelting furnace 1, including other water cooling jackets installed in the gutter of the smelting furnace 1. respectively.

By the way, the change in the heat dissipation of the furnace body reflects the state of wear and tear of the bricks. Therefore, by continuously measuring the amount of heat dissipated in the furnace body, it is possible to know the condition of the bricks in the furnace.

Next, the fifth function of the central control section 27 will be explained.

This fifth function is based on the expansion ω of the brick 18 and the shell iron skin '+9, which are continuously detected by the displacement sensor 9.
For example, by analyzing various aspects of the furnace body, e.g., changes in the residual thickness of the furnace body (t), the change in the residual thickness of the three-layer absorber, and the change in stress applied to the shell from the graph of the change curve and the compression characteristic curve of the expansion absorber, etc. Display these results using graphs etc.
This function covers the screen display and printout on the printer 31.

As described above, in this example, the central control section 27 is
~Has a fifth function.

It is also possible to provide the following functions to the medium heat control section 27.

■Determine the 11n timing of the heat exchanger based on the cooling water supply/drainage period of the water-cooled jacket/shoes 1-.

(11
1 dormitory and decide on changes in lance placement and timing.

■Water-cooled JJI cooling water that goes into the heat exchanger of 1~? i If the water stops due to some kind of trouble, adjust the new charge of industrial water for cooling based on the drainage temperature of the water cooling tank.

■Determine the remaining status of the bricks in the furnace based on the temperature of each brick, radiated heat m, etc., and create materials for determining the next furnace repair period.

■Estimate the time to replace the expansion absorber from the expansion measurement results.

■In addition, collect various data for furnace operation analysis.

In addition, we will further develop this monitoring device to create a system that provides direct feedback of measurement data to the steelmaking process to perform active control and provide operational management information in a more concrete form to on-site operators. It is also possible.

As explained above, the furnace body monitoring and arrangement according to the present invention transmits temperature measurement signals from multiple locations on each of the furnace bodies of a melting furnace, a wrought fireplace, and a blister producing furnace to one location. The stored data is then plotted as a curve showing changes in temperature over time, and the graph is plotted in a graph that is set longer as the time indicated by the unit scale on the time axis increases in the past. It represents continuous temperature changes over a long period of time within the range of the RII axis for a limited length of From this, the situation of the ζ(-) furnace body can be properly grasped, and the one with the shortest flexibility or the one with the longest life among the three furnace bodies can be combined. They can be easily operated to balance their bendability.

[Brief explanation of drawings]

Fig. 1 is a schematic explanatory diagram of a continuous copper making furnace, Figs. and Fig. 4 are principle diagrams for explaining different examples of the displacement sensor [J], Fig. 5 is a sectional view of a part of the furnace to explain the location of the sensor, Fig. 6, Fig. 7, Fig. 8, 113J and 9 are diagrams for explaining different display examples for monitoring the furnace body. 1...Smelting furnace, 2...Smelting furnace, 3...
...Blutinated copper manufacturing furnace, 7...C-C thermocouple, 8
...C-A thermal lightning pair, 20...Multiplexer, 21...2-wire transmission line, 22...
・Central controller, 25...Computer main unit, 2
6...Input capo]-127...Central control section, 28...Memory, 29...Boat, 30...Display. Applicant Mitsubishi Metals Corporation Figure 6 (0C) 0030003000 (Min,) Figure 7 Time (Day) District 8 (-11, -1) Figure 9 (Mca1/h) 5000.1 →Tinne (Do y)

Claims (1)

[Claims] J is a continuous steelmaking furnace that connects a melting furnace, a wrought fireplace, and a blister manufacturing furnace.
3, and place it in the appropriate place on each of those three furnace bodies (=J
4) The first, second and third temperature sensors J! Y and
sensor switching means that sequentially switches the detection signals of the individual hinges of each temperature sensor group and supplies them to the two-wire transmission line;
A storage unit that stores the detection signals of each range supplied from the two-wire transmission line in a storage area assigned to each sensor group, and a display unit that can graphically display changes over time in the temperature detected by each temperature sensor 1. and the representation of the unit scale of the time axis on this display section], a time axis setting section that sets the interval to become longer as you go back in the past, and a time axis setting section that sets the unit scale of the time axis on the display section; A graph converting section for displaying stored data in a graph on the display section is used as a monitoring device.