JPS6055575B2 - Furnace body monitoring device in continuous copper making furnace - Google Patents

Description

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

As shown in Fig. 1, the continuous copper smelting furnace consists of a smelting furnace 1, a smelting furnace 2, and a blister manufacturing furnace 3.The continuous copper smelting furnace is made up of a smelting furnace 1, a smelting furnace 2, and a blister manufacturing furnace 3. It produces continuously and consistently from concentrate to blister copper.

Such continuous copper making furnaces have simple equipment, are inexpensive to construct, produce exhaust gas with a high concentration of 500, and are attracting attention as low-pollution, energy-saving copper making furnaces with little 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 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 a lance 4, and melted to produce a blister and a molten metal. The repeatedly produced molten metal is solidified and pulverized, and this is substantially continuously blown into the melt in the smelting furnace 1 (indicated by arrow A in FIG. 1) to remove the copper contained in the smelter. Most of it is absorbed into 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 electrode 5 is used to heat and keep the smelt and the smelt warm, and they are separated based on the difference in specific gravity.
Furthermore, in the third smelting process, the steel from the separation process is continuously sent to the blister copper manufacturing furnace 3, where air, solvent, and coolant are appropriately mixed and charged from the lance 6. Copper and the above-mentioned sulfur are continuously produced by an oxidation reaction of iron and sulfur. By the way, the lance mechanism, which is one of the features of the continuous copper making furnace, is used in the melting furnace 1 to pass ore, stone, etc.
Approximately 150 TrL of solvent, fuel, etc. with oxygen-enriched air,
By blowing into the melt at a high speed of ls, instant melting can be achieved, and advantages such as high reaction efficiency, low fuel consumption, downsizing of the furnace, and high 502 concentration exhaust gas can be obtained. In recent years, the durability of continuous copper furnaces has been greatly improved by installing water-cooled jackets, and the condition of refractories and jackets can be monitored by monitoring the temperature, expansion, etc. of the furnace body materials. It is now possible to catch problems quickly and prevent troubles caused by abnormalities, and also to ensure that the furnace body does not contract or expand normally when the temperature rises after furnace repair or during regular boiler inspections. It has also become possible to grasp important points such as whether the robot is moving or not, and whether local heating is occurring due to a fire. Conventionally, such monitoring of the furnace body has been carried out using multi-point temperature recorders or indicators, etc., and these temperature recorders and indicators are used for the melting furnace, smelting furnace, and blister manufacturing furnace. It simply recorded and displayed the measurement results at multiple locations on each 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 making furnace performs a series of functions through the cooperation of three furnace bodies, the lives of these three furnace bodies must be balanced so that those with short lives match those with long lives. It is necessary to take In this respect, the measurement results have not necessarily been effectively utilized. This invention was made in consideration of the above circumstances, and it transmits temperature measurement signals from multiple locations on the furnace bodies of each of a melting furnace, an alchemy furnace, and a blister manufacturing furnace to one location and stores them there. , and by displaying the stored data as a curve showing changes in temperature over time in a graph that becomes longer as the time represented by the unit scale of the time axis goes back into the past, the limited length of the graph can be reduced. represents continuous temperature changes over a long period of time within the time axis of
In addition, it is possible to monitor the temperature change of the furnace body very appropriately by showing particularly fine temperature changes in the time domain close to the current time, and from this, the status of the three furnace bodies can be properly grasped and the To provide a monitoring device for a furnace body in a continuous copper making furnace, which makes it easy to operate the furnace bodies so that the lives of the furnace bodies are balanced by matching those with a short life to those with a long life. be.

Embodiments of the present invention will be described below with reference to FIGS. 2 to 9. FIG. 2 is a system configuration diagram of this device, in which 7 is a CC thermocouple, 8 is a C-A thermocouple, and 9 is a displacement sensor.

The displacement sensor 9 converts 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 measuring head 10 moves, the point of contact with the resistance wire 11 moves and its resistance changes. Note that such a displacement sensor 9
For example, it is also possible to employ a differential transformer as shown in FIG. This differential transformer is composed of a cylindrical coil in which a primary coil 12 and a secondary coil 13 are arranged, and a movable iron core 14 that magnetically couples these primary coil 12 and secondary coil 13. , the displacement is determined from the induced electromotive force of the secondary coil 13 when the movable core 14 moves together with the probe. A large number of these thermocouples 7, 8 and displacement sensors 9 are attached to appropriate positions on the respective furnace bodies of the aforementioned smelting furnace 1, wrought silver furnace 2, and blister copper manufacturing furnace 3.

In this example, the mounting points, that is, the temperature and displacement measurement points are determined as shown in the table below. S furnace: Melting furnace, SH
Furnace: wrought silver furnace; C furnace: blister copper manufacturing furnace; CA: C-A thermocouple; CC: C-C 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 a point P2 on the bottom surface of the stamp layer 16.

The temperature of the Daki brick is the temperature of the Daki brick 18 located between the hearth 15 and the side wall 17, B. The L jacket temperature is the temperature of the water cooling jacket located at the hot water level (bath line) in the furnace. In the ceiling temperature column, below the jacket means:
The lower surface of the water-cooled jacket located on the ceiling of the furnace, and the upper surface of the water-cooled jacket is the upper surface of the water-cooled jacket. The side wall 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 after heat absorption, and the ceiling jacket cooling water discharge temperature refers to the temperature of the cooling water discharged from the water cooling jacket provided on the ceiling of the furnace. This is the cooling water temperature after heat absorption.
The cooling water drainage temperature of the other jacket 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 and ceiling of the furnace, such as a gutter connecting the furnace and the earthen floor. In the column of hearth cooling air, the inlet temperature 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 11 between the daki brick 18 and the outer shell iron skin 19, that is, the expansion amount of the daki brick 18, as shown in FIG. , shell iron skin means the amount of change in the distance 12 between the shell iron skin 19 and the fixed position P3 outside thereof, that is, the amount of expansion of the shell iron 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 cooling jackets of each furnace 1, 2, and 3, and in this example, the temperature of the cooling water supplied to the water cooling jacket of each furnace 1, 2, and 3. are assumed to be the same, and the temperature measurement point is determined at one location. In this way, in this example, there are a total of two points for measuring temperature and displacement.

A large number of thermocouples 7, 8 and displacement sensors 9 at these measurement points are connected to the first, second and third thermocouples 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 sensors 9 are connected to multiplexer 20, and each of these multiplexers 20
are connected to a central controller 22 in a control room R, which will be described later, by a common two-wire transmission line 21. The central controller 22 is
Detection signals from sensors connected to each multiplexer 20 are sequentially input from a common two-wire transmission line 21 in a predetermined order.

Therefore, the multiplexer 20 has an input switching function that scans the sensors connected thereto in a predetermined order, and the central controller 22 calls each multiplexer 20 in a predetermined order. A multiplexer 20 sequentially digitizes the detection signals of the sensors connected thereto and transmits them to a central controller 22 from a two-wire transmission line 21 in the form of a communication code. Therefore, in this example, 3
Detection signals of temperature and displacement from a total of two blade locations in one furnace 1, 2, and 3 are supplied to the central controller 22 in a predetermined order through a common two-wire transmission line 21, and this process is repeated.

In this way, a total of 2
Detection signals from an extremely large number of 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 requests the transmission of each multiplexer 20 as described above and sends the received data to the alarm indicator 23.

This alarm display 23 displays an alarm judgment for each multiplexer 20. Further, the data received by the central controller 22 is transferred from the computer coupler 24 to the computer main body 2.
Sent to 5.

The computer main body 25 stores data input from the input port 26 in a data memory 28 by means of a central control section 27. At that time, the input data is the thermocouple 7
, 8, and displacement sensor 9 are stored in corresponding storage areas allocated to each sensor. The central control unit 27 includes a CPU and a program memory in which programs used by the CPU are stored.
The central control unit 27 analyzes various data input from the sensors of each furnace 1, 2, and 3, and supplies the results to a CRT display 30 and a printer 31 via a boat 29. Further, the computer main body 25 stores its storage data on an external magnetic disk 32 as appropriate. Note that 33 in FIG. 2 is a battery unit. Next, 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 displays the measured values from the sensors of each furnace 1, 2, and 3 on the display 30 for each furnace 1, 2, and 3.
This is to display numerical values on the screen. Those numbers are
It is updated every predetermined time (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
The display screen is automatically sent to the printer 31 as a daily report.
This is a hard copy. Second, the central control unit 27 has a function of displaying on the display 30, upon request, a graph of past changes in the measured value of any sensor over time for monitoring purposes by the operation operator.

FIG. 6 shows a display example of the change 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 hours, and up to the past two hours, data is taken every 6 minutes finely, and before that, data is taken roughly every hour, and the unit scale of this time axis is The time represented by is short up to the past two hours,
The period before that has been set for a long time. in this way,
In this example, the time represented by the unit scale on the first time axis differs in two steps. It is also possible to graph the data of the required time at required intervals. As an example, the seventh
The figure shows an example of a display of changes over time in the hearth temperature in the melting furnace 1 after the monitoring system is started up. 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 L in the graph is short, with one division per day, and the time axis on the left side is is set as long as 4 days per division. By the way, in a continuous copper furnace,
Normally, the temperature detected by each sensor changes relatively slowly.
On the other hand, when an abnormality occurs, it changes relatively rapidly, so when monitoring whether there is an abnormal change in the detected temperature, it is better to collect data at small time intervals in the time domain close to the current time. However, there is no need to monitor particularly detailed temperature changes in the past.

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 recent minutes to obtain detailed data, while the time represented by the unit scale is lengthened for the minutes before that. Collecting coarse data means that it represents continuous temperature changes over a long period of time within the limited time axis of the graph, and in the time domain close to the current time. In particular, it represents minute 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 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 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. Note that 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 be changed in three or more steps.

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 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.
, 2 and 3 are displayed on the display 30.
This is a function that allows you to selectively illustrate the images.

FIG. 8 shows an example of a location where the water cooling jacket water temperature in the alchemy furnace 2 is measured. In this example, the furnace 2
The cooling water flow paths corresponding to each of the drainage temperature measurement points of the water cooling jacket are selectively displayed in color on the screen showing the pattern. In the state shown in the figure, from the part corresponding to the shaded area in the many water supply ports B, through the water cooling jacket corresponding to the shaded area in the design of the Rehime Furnace 2, to the part corresponding to the shaded part in the many drain ports C. A series of cooling water flow paths leading to the point where the 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 function of the central control unit 27 described above. For example, this can be done by specifying a number marked for each sensor using a keyboard or the like. By the way, managing the cooling water drainage temperature of the water cooling jacket is extremely important in order to detect melting damage of the water cooling jacket or surrounding bricks at an early stage, as well as to know whether an appropriate amount of cooling water is being secured. In the event that an abnormality occurs in these measured values, the ability for operators to immediately know the location of the water jacket, water supply and drainage piping, and valves is extremely advantageous in taking prompt safety measures. It is.

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

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 of the sensor to be displayed based on instructions from the keyboard or the like described 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 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 unit 27 functions as a detection means for detecting an abnormality in the detection signal of the sensor. In addition, although the illustrated example mentioned above is about the smelting furnace 2, the smelting furnace 1 and the blister production furnace 3 can be similarly illustrated.

Furthermore, in addition to the display regarding the water cooling jacket's drainage temperature, it is also possible to selectively display diagrams regarding other measurement locations in correspondence with the sensor at the measurement location. Further, the selection section in the central control section 27 may be a selection section that receives a signal from the detection means that detects an abnormality in the detection signal of the sensor and automatically selects the sensor in which the abnormality has been detected. It is possible. Next, the fourth function of the central control section 27 will be explained. This fourth function calculates the amount of heat absorbed from the amount of cooling water flowing into the water cooling jacket and the continuously measured drainage temperature of each water cooling jacket, and dissipates it in each part of the furnace body 1, 2, and 3. This function displays the amount of heat on the display 30 and prints it out on the printer 31. FIG. 9 shows a display example of endothermic change of the water cooling jacket in the smelting furnace 1. In this display example, curve D is the change in the amount of heat absorbed by the side wall jacket, curve E is the change in the amount of heat absorbed by the ceiling jacket, curve F is the change in the total amount of heat absorbed by the side wall jacket and the ceiling jacket, and curve G is the smelting furnace 1. The graphs respectively represent changes in the amount of heat absorbed by all the jackets in the smelting furnace 1, including other water-cooled jackets provided in the gutters and the like. Incidentally, changes in the amount of heat dissipated from the furnace body reflect the 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 unit 27 will be explained. For example, calculate the changes in the residual thickness of the expansion absorber in the furnace body's furnace body, the changes in stress applied to the shell from the graph of the change curve, and the compression characteristic curve of the expansion absorber, and then display these results in graphs. This is a function of displaying the screen on the display 30 and printing it out on the printer 31.As described above, the central control unit 2j7 in the present invention
It has a fifth function.

In addition, it is also possible to provide the central control unit 27 with the following functions.

1. Determine when to clean the heat exchanger based on the cooling water supply and drainage temperature of the water cooling jacket.

2 Inferring the wear and tear of the bricks directly under the lance from the hearth temperature,
Deciding on and when to change lance placement.

3. If the cooling seawater in the cooling water heat exchanger of the water cooling jacket stops due to some trouble, the new charge amount of industrial water for cooling is adjusted based on the temperature of the water discharged from the water cooling jacket.

4. 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 time.

5. From the expansion measurement results, estimate the time to replace the expansion absorber.

6. Collect various other data for furnace operation analysis.

In addition, by further developing this monitoring device, we have developed a system that provides active control and more specific operational management information to on-site operators by directly feeding back measurement data to the copper manufacturing process. It is also possible to do so. As explained above, the furnace body monitoring device according to the present invention transmits temperature measurement signals from multiple locations of each of the furnace bodies of a melting furnace, a smelting furnace, and a blister producing furnace to one location. By storing the stored data and displaying it as a curve showing changes in temperature over time in a graph where the time indicated by the unit scale on the time axis goes back in time, the graph becomes longer. It represents continuous temperature changes over a long period of time within a limited length time axis, and it also represents particularly fine temperature changes in the time domain close to the current time, making it extremely difficult to observe temperature changes in the furnace body. From this, the status of the three furnace bodies can be properly grasped, and the lifespan of the three furnace bodies can be balanced by matching the one with the shortest lifespan to the one with the longest lifespan. You can make it easy to operate them by taking the following steps.

[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...Silver furnace, 3...
...Blutinated copper manufacturing furnace, 7...C-C thermocouple, 8
......C-A thermocouple, 20...Multiplexer, 21...2-wire transmission line, 22...
・Central controller, 25...Computer main unit, 2
6...Input boat, 27...Central control unit, 28...Memory, 29...Boat, 30...Display.

Claims (1)

[Claims] 1. In a continuous copper making furnace in which a melting furnace, a smelting furnace, and a blister producing furnace are connected, first, second, and third temperature sensor groups are installed at appropriate positions in each of these three furnace bodies, and each of these 2 by sequentially switching the detection signals of the individual sensors in the temperature sensor group.
a sensor switching means for supplying to the two-wire transmission line; a storage section for storing detection signals of each sensor supplied from the two-wire transmission line in a storage area assigned to each sensor group; A display section that can display changes over time in a graph, a time axis setting section that sets the time indicated by the unit scale of the time axis of this display section to become longer as you go back in the past, and 1. A monitoring device for a furnace body in a continuous copper making furnace, comprising: a graph converting section for displaying data stored in the storage section in a graph on the display section.