JPS60110821A - Device for monitoring body of continuous copper making furnace - Google Patents

Abstract

PURPOSE:To monitor the condition of each furnace in a process for producing crude copper at all times and taking remedy in prompt response with abnormality so that the life of each furnace is balanced by displaying the respective conditions of the furnaces with the temp. in a smelting furnace, slag cleaning furnace and crude copper producing furnace in the process for producing blister copper from the concentrate of copper on a display part. CONSTITUTION:Copper concentrate, flux, fuel and air are blown through a lance 4 into a smelting furnace 1 and the slag A from a blister copper producing furnace 3 is added thereto and is melted to form the matte and slag of copper. The matte and slag are fed into a slag cleaning furnace 2 where the matte and slag are heated by an electrode 5 and are separated by a difference in specific gravity. The matte is fed to the furnace 3 where air and flux are blown through a lance 6 to oxidize away the Fe and S in the matte and the blister copper is produced. Many thermometers and thermal expansion meters are attached to the respective furnaces and the conditions of the three furnace bodies are detected from the measured value thereof. The life of the three furnace bodies is balanced to meet the short and long lives from the association among said conditions, by which the working efficiency over the entire production process is improved.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to 1) 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 80211°C, and low smoke leakage.

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

In the first smelting process, the reaction product of the smelting furnace 1 is obtained by appropriately blending fuel air with melted ore mainly composed of ore and solvent to a proportion that meets preset reaction conditions. A predetermined supply amount per w hour is directly and continuously charged into a certain solution from the lance 4, and melted to generate a blister, which is also generated in the blister manufacturing furnace 3 in the subsequent process. Most of the copper contained in the repeated heating is assimilated and pulverized and blown substantially continuously into the melt in the smelting furnace 1 (indicated by arrow A in FIG. 1). is absorbed into the leather. Then, in the second separation step, the product from the first smelting stage is sent to the smelting furnace 2, where it is connected to the electrode 5.
Heat and keep warm using a heat exchanger, and separate them based on the difference in specific gravity. Furthermore, in the third smelting process, the slag from the separation process is continuously sent to the blister copper manufacturing furnace 3, where air, a solvent, and a remover are appropriately mixed and charged from the lance 6.
The oxidation reaction of the iron and sulfur content in the luster continuously produces copper and the above-mentioned sulfur.

By the way, one of the characteristics of continuous steelmaking furnace is Lansing 4.
In the melting furnace 1, ore, solvent, fuel, etc. are blown into the melt together with oxygen-enriched air at a high speed of about 1501/S through a lance 4 inserted vertically into the furnace from the ceiling of the furnace. Instant melting, high reaction efficiency,
Low fuel consumption, smaller furnace, i! IS O2? ! 111
Benefits such as exhaust gas can be obtained.

In recent years, continuous copper making furnaces have been equipped with water cooling jackets.
The durability of the furnace body has been greatly improved, and the furnace body vJF
By monitoring the temperature, expansion, etc. of 31, it is now possible to quickly grasp the situation of refractories, di-vkets, etc., and prevent troubles caused by abnormalities.
Also, check whether the contraction and expansion of the furnace body is moving normally, even if the temperature is increased after furnace repair or during constant boiler inspection, and whether local heating is occurring due to a fire. I was also able to understand the important points.

Conventionally, such monitoring of the furnace body has been carried out using multi-point moisture recorders or indicators, etc., and these temperature recorders and indicators are used for each of the melting furnace, wrought fireplace, and blister manufacturing furnace. It simply recorded and displayed 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, a continuous copper making furnace performs a series of functions through the cooperation of three furnaces. Therefore, the lives of these three furnace bodies are balanced so that those with short lives match those with long lives. It is necessary. In this respect, the measurement results have not necessarily been effectively utilized.

In addition to this, there were also the following problems.

■As the number of measurement points increases, thermal lightning pairs will be connected in parallel, increasing the reliability of temperature data.

■Adding or changing measurement points is complicated.

■The number of signal pull lines increases, making maintenance difficult.

■Alarm settings cannot be made individually.

(2) Statistical processing is difficult because the records only remain in the chip p-t.

This invention was made in consideration of the above-mentioned circumstances, and it is possible to measure the temperature, thermal expansion, etc. of multiple points at one point in each of the furnace bodies of the melting furnace, smelting furnace, and blister manufacturing furnace. By transmitting and storing the data there, and being able to selectively display the stored data as appropriate, it is possible to compare the conditions of the three reactor bodies and understand the relationship between them. , From this, it is easy to operate these three furnace bodies so that the lifespan of the three furnace bodies is balanced by matching the one with the shortest lifespan to the one with the longest lifespan, and Continuous steel manufacturing is extremely advantageous in terms of maintenance by transmitting measurement signals from multiple locations to one location via a common two-wire transmission line, and can eliminate the above-mentioned conventional problems at once. The present invention provides a monitoring device for a furnace body in a furnace.

Embodiments of the present invention will be described below with reference to FIGS. 2 to 9.

Figure 2 is a system configuration diagram of this device, and 7 in the figure is c.
-c thermocouple, 8 is C-△ thermocouple, 9 (, is displacement sensor)
It is. 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 one-herance as shown in FIG. The stiff differential transformer includes a cylindrical coil in which a primary coil 12 and a secondary coil 13 are arranged, and a cylindrical coil in which a primary coil 12 and a secondary coil 13 are arranged.
It is composed of a movable iron core (core) 14 that magnetically couples the measuring element, and the displacement is calculated from the induced electromotive force /J of the secondary coil 13 when the movable iron core 14 moves together with the measuring element.

These thermocouples 7, 8 and displacement sensors 9 are attached in large numbers to suitable locations on the respective furnace bodies of the above-mentioned l18 refining furnace 1, rehime furnace 2, and blister manufacturing furnace 3. Now, the points for measuring f4#, that is, the measurement points for fla and displacement, are determined as shown in the table below.

(Left below) S furnace: melting furnace, S)-1 furnace: wrought fireplace, C furnace: blister copper manufacturing furnace, CA: C-A thermocouple, cc: cc thermocouple, P
M: Potentiometer.

The measurement points in the table above are briefly explained below.

In the column of Hearth'/fJ=Iff, above the stamp refers to the point P+ on the upper surface of the stamp layer 16 below the hearth 15 as shown in FIG. 5, and below the stamp refers to the upper surface of the stamp layer 16. is point P2. The temperature of the porcelain brick 18 is the temperature of the porcelain brick 18 located between the hearth 15 and the side wall 17.]3.
The first temperature is the temperature of the water cooling jacket located at the molten metal level (pass line) in the furnace. In the column of ceiling temperature, "under the jacket" means the lower surface of the water cooling jacket located at the top of the furnace, and "above the jacket" means the upper surface of the water cooling jacket. The side wall jacket cooling water supply water temperature refers to the temperature of the cooling water until it absorbs heat from the water cooling jacket provided on the side wall of the furnace.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. 1
This is the temperature of the cooling water released after absorbing heat. That Senji V-Kell
- Cold 11 water drainage scars are provided in places other than the side wall of the furnace and the top J1, such as the gutter that connects the earthen floor around the furnace. : is the temperature of the cooling water discharged from the water cooling jacket after heat absorption. The inlet temperature in the hearth cooling air column 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 cooling the hearth. In the expansion amount column, the term "daki brick" refers to the amount of change in the distance j1 between the dagi brick 18 and the outer shell iron skin 19, that is, the expansion m of the daki brick 18, as shown in FIG. Also, the shell iron skin refers to the shell iron skin 19 and its external fixed position P3.
This is the amount of change in the distance "2" between the two, 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 temperature is 1°2.3 for each house.
The humidity of the cooling water supplied to the water cooling jacket of
In this example, the cooling water to the water cooling jackets of each house 1, 2.3 is the same, and the temperature is measured at one point.

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

A number of thermocouples 7, 8 and displacement sensors 9 at these measuring 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 thermal lightning pairs 7.8 and displacement sensors 9 are connected to a multi-branch 20, and each multi-branch 20 is connected to a 16G1 device (described later) via a common two-wire transmission line 21. Central controller 22 in room R
It is connected to the.

The central controller 22 sequentially transmits the detection signals of the sensors connected to each multiplexer 2o from the common 2m transmission line 21 in a predetermined order. Therefore, multibrekuri 2
0 skips the sensors connected to it in a predetermined order 1? The central controller 22 calls each multiplexer 20 in a predetermined order, so that the stored multiplexer 20 is
The pincers connected thereto are sequentially digitized and their detection signals are sequentially digitized and transmitted to the central controller 22 from the two-wire transmission line 21 in the form of a communication code.

Therefore, in the case of this example, the temperature and displacement detection signals from 283 cutting locations at 1.2°3 are sent to the central controller 2 through the common 2-wire transmission line 21 in a predetermined order.
2, and this is repeated.

In this way, a total of 28
Detection signals from as many as three measurement points are transmitted to the central controller 22 in the control room R.

This is extremely advantageous in terms of wiring for the transmission line 21 and its maintenance, and also facilitates the addition of 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 an alarm judgment for each multi-breaker 20.

Further, data received by the central controller 22 is sent from the computer combiner 24 to the computer main body 25. This computer main body 25 inputs data from an input port 26 to a data memory 28 by a central control unit 27.
to be memorized. At that time, the input data was 7.8
, and displacement sensor 9, are stored in memory areas assigned corresponding to each sensor. The central control unit 27 includes a CPU and a program memory in which programs used by the CPU are stored. Therefore, this central control unit 27 analyzes various data input from the sensors of each of the eight furnaces 1.2.3, and supplies the results to the CR1-display 30 and printer 31 via the port 29. In addition, the computer main body 25 stores its stored data on an external magnetic disk 32 as appropriate. Note that 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 displaying a display for monitoring measured values on the display 30 and a function of causing the printer 31 to print information. The former display function displays f10 measured by the sensors of each of the eight furnaces 1 and 2.3.
Numerical values are displayed on the screen of the display 30 for each category 1, 2, and 3. These numerical values are updated at predetermined intervals (for example, every 6 minutes). When these values reach the warning set value, the value is identified and displayed in red, and when the alarm value reaches an even higher alarm value, 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 display of changes in hearth temperature over time in the blister copper manufacturing 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,
Up to the past two hours, data is taken every 6 minutes in detail, and before that, data is taken roughly every hour.
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.

It is also possible to graph the data between 11.1 and 11.1 at necessary intervals. - As an example, Fig. 7 shows the hearth 8.8 in melting furnace 1 after startup of this monitoring system.
An example of displaying the change in degree over time is shown. 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 day per division, and the time axis on the left side is is set as long as 4 days per division.

By the way, in the J3 continuous copper making furnace, the temperature detected by each sensor normally changes relatively slowly, but when a fluctuation occurs, it changes relatively rapidly, so it is difficult to determine whether there is an abnormal change in the detected temperature. When monitoring temperature, it is best to collect data at small time intervals in a time domain close to the current time, and there is no need to monitor temperature changes in the past beyond a certain point. In this respect, as mentioned above, the time axis of the graph is set such that the time represented by the unit scale is shortened for the most recent minutes to obtain detailed data, while for the minutes before that, the time represented by the unit scale is
Obtaining coarse data over a long period of time means that within the limited time axis of the graph, it represents continuous temperature changes over a long period of time, and it is close to the present moment. In the time domain, it represents particularly fine temperature changes. 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 converting 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. The time represented by the unit scale is set differently. The graph conversion unit displays the data stored in the memory 28 and the data stored in the external magnetic disk 32 in a graph on the display 30 based on the time axis thus set.

In the display example of the graph described above, the time represented by the unit scale on the time axis differs in two steps, but it may differ in three steps or more. Further, it is also possible to gradually set the time represented by the unit scale of the time axis to be longer in a stepless manner as one goes back into the past. 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 to selectively show on the display 30 the installation locations of the sensors connected to the eight furnaces 1, 2, and 3. J3 water cooling di17
An illustrated example of the measurement location of the drainage temperature of the ass 1- is shown. In this example, the design of the regeneration furnace 2 is displayed on the screen, and the cooling water flow paths corresponding to each of the drainage temperature measurement points of the water cooling jacket are selectively displayed in color.

In the illustrated state, the water flows from a point corresponding to the shaded area in the large number of water supply ports B, through a water-cooled Jahut (corresponding to the shaded area in the design of the furnace 2), to the shaded area in the large number of drains D C. A series of cold fill water flow paths leading to corresponding locations 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 30 by the first display 1 of the central control unit 27 described above. This is done by specifying, for example, a number marked for each sensor 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 melting damage of the water cooling jacket or surrounding bricks at an early stage, it is extremely important to know whether an appropriate amount of cooling water is being secured, and in this regard, it is important to detect abnormalities in the measured values. In such cases, it is very advantageous for the operator to be able to immediately know the location of the water tank, water supply and drainage pipes, and valves in order to take prompt safety measures.

The central control unit 27 is equipped with the following means to realize the display function of M3.

That is, the central control unit 27 has a selection unit and a display control unit, and the selection unit selects the diagram corresponding to the location where the display sensor is arranged based on instructions from the keyboard or the like mentioned above. It is. The display control section searches for a diagram corresponding to the sensor arrangement location selected by the selection section and causes the ice play 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 unit 27 functions as a detection means for detecting an abnormality in the detection signal of the sensor.

In addition, although the -1 series of illustrations are about the smelting fireplace 2, the smelting furnace 1, J3, and the blister manufacturing furnace 3 can also be illustrated in the same way. Furthermore, in addition to displaying the temperature of the wastewater from the water-cooled jackets 1 to 1, it is also possible to selectively display diagrams related to other measurement circles F'li in accordance with the sensor 3.1 at the measurement location. The selection unit t in the central control at 27 receives the signal from the detection means for detecting an abnormality in the detection signal of the sensor 1:J, and the abnormality is detected! , : It is also possible to use a selection section that automatically selects the sense.

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

This fourth function calculates the amount of heat absorption from the amount of cooling water to the water-cooled shitoget and the continuously measured drainage temperature of each water-cooled jacket, and calculates the amount of heat absorption for each part of the furnace body 1° 2.3. This function displays the amount of heat dissipated on the display 30 and allows the printer 31 to mix the amount of heat dissipated. FIG. 9 shows an example of the display of the endothermic change of the water cooling jacket flowing into the smelting furnace 1. The curve in this display example represents the change in the amount of heat absorbed by the side wall jitocket.
Curve E represents the change in the amount of heat absorbed by the ceiling jacket, and curve `` represents the change in the amount of heat absorbed by the side wall jacket and ceiling jacket J1.
Curve G represents the change in heat absorption of all the jackets in the smelting furnace 1, including other water-cooled jackets provided in the gutter of the smelting furnace 1, respectively. It reflects the wear and tear condition well. Therefore, by continuously measuring the amount of heat dissipated from the furnace body, it is possible to know the condition of the bricks inside the furnace.

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

This fifth function analyzes the expansion ω of the dowel bricks 18 and the shell shell 19 continuously detected by the displacement sensor 9, and detects, for example, changes in the residual thickness of the expansion absorbing material in the dome part of the furnace body, and its There is a function C that calculates the stress changes applied to the shell from the graph of the change curve and the compression characteristic curve of the expansion absorbing material, and displays these results on the screen on the disk bracelet 30 as a graph, prints it on the printer 31, etc. .

In this example, the central control unit 27 has the first to fifth functions.

In addition, it is also possible for the central control section 27 to have the following functions.

■Determine when to clean the heat exchanger based on the cooling water supply and drainage temperature of the water-cooled Jitokut.

■Inspect the wear and tear of the bricks directly under the lance from the hearth temperature, and decide on changes to the lance arrangement and when to do so.

■1 cold FJ in the cooling water heat exchanger of water-cooled Shitoget
If the seawater for J is stopped due to some kind of trouble, the new charge m of industrial water for cooling is adjusted based on the drainage temperature of the water-cooled water cooler.

■Determine the remaining status of the bricks in the furnace based on the temperature of each brick, amount of heat dissipated, 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 and provide direct feedback of measurement data to the steelmaking process to perform active control and provide more specific operational management information to site A verators. It is also possible to create a system that

As explained above, the furnace body monitoring device according to the present invention collects measurement signals such as temperature and thermal expansion range at multiple points in each of the furnace bodies of a melting furnace, a smelting furnace, and a blister manufacturing furnace at one point. By transmitting the data, storing it there, and making it possible to selectively display the stored data as appropriate, it is possible to compare the conditions of the three furnace bodies and understand the relationship between them. Therefore, it is made easy to operate these three furnace bodies in such a way that the short-lived one of the three furnace bodies is matched with the long-lived one, and their lives are balanced. Furthermore, since measurement signals from multiple locations are transmitted to one location via a common two-wire transmission path, it is extremely advantageous in terms of maintenance.

In addition, it has the following effects.

■It is possible to measure a large number of locations with one central controller.

(≧) Easy to connect to E1 computer.

■Can be set to issue an alarm for each measurement.

■It is easy to add or change measurement points.

(Can correspond to input from O8 scale.

(1) The first period is short.

[Brief explanation of the drawing]

Fig. 1 is a schematic explanatory diagram of a continuous copper making furnace, Figs. 2 to 9 show an embodiment of the present invention, Fig. 2 is a schematic diagram of the configuration of this monitoring device, and Figs. 3 and 4 are FIG. 5 is a cross-sectional view of a part of the furnace to explain the location of the sensor, FIG. 6, FIG. 7, FIG. 8, and FIG. 2A and 2B are diagrams for explaining different display examples for monitoring the furnace body, respectively. 1... Smelting furnace, 2... Renhime furnace, 3...
...blur copper manufacturing furnace, 7...-C-C thermocouple, 8.
...C-A thermocouple, 20...Multiplex cable, 21...2-wire transmission line, 22...
・Central M component, 25...Computer main unit, 2
6...Input boat, 27...Central control unit, 28...Memory, 29...Boat, 30...Display. Applicant Mitsubishi Metals Corporation Figure 6 ('Cn0O30003000 Figure 8 (-m-, -m-) Figure 9 (Mcal/h) 11-→-ηme (Day)

Claims (1)

[Claims] Melting furnace! a In a continuous steelmaking furnace in which a hime furnace and a blister production furnace are connected, the iron is installed at the appropriate place in each of the three furnace bodies (14
) and the detection signals of the individual sensors of each temperature sensor group are sequentially ground and supplied to the two-wire transmission line, etc. 2
A memory unit stores the detection signals of each range supplied from the line transmission line in the record 111g+-reno 7 assigned to each sensor group, and the data in this memory unit is appropriately stored in 3:i (selected and , a control section that displays the status of the melting furnace, smelting furnace, and blister manufacturing rJI on the display section.
[Furnace body monitoring device 3゜