CN110475881B - Method for operating metal refining furnace - Google Patents
Method for operating metal refining furnace Download PDFInfo
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- CN110475881B CN110475881B CN201980001817.1A CN201980001817A CN110475881B CN 110475881 B CN110475881 B CN 110475881B CN 201980001817 A CN201980001817 A CN 201980001817A CN 110475881 B CN110475881 B CN 110475881B
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- 238000007670 refining Methods 0.000 title claims abstract description 45
- 239000002184 metal Substances 0.000 title claims abstract description 44
- 229910052751 metal Inorganic materials 0.000 title claims abstract description 44
- 238000000034 method Methods 0.000 title claims abstract description 40
- 238000006073 displacement reaction Methods 0.000 claims abstract description 76
- 239000000463 material Substances 0.000 claims abstract description 8
- 239000002994 raw material Substances 0.000 claims description 21
- 239000003638 chemical reducing agent Substances 0.000 claims description 18
- 238000001816 cooling Methods 0.000 claims description 18
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 10
- 229910052802 copper Inorganic materials 0.000 claims description 10
- 239000010949 copper Substances 0.000 claims description 10
- 238000002156 mixing Methods 0.000 claims description 10
- 239000010410 layer Substances 0.000 claims description 6
- 238000005259 measurement Methods 0.000 claims description 6
- 238000010438 heat treatment Methods 0.000 claims description 4
- 230000001965 increasing effect Effects 0.000 claims description 4
- 239000011247 coating layer Substances 0.000 claims description 2
- 239000012141 concentrate Substances 0.000 description 15
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 14
- 238000003723 Smelting Methods 0.000 description 9
- 239000002893 slag Substances 0.000 description 7
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 6
- 238000006243 chemical reaction Methods 0.000 description 6
- 239000011449 brick Substances 0.000 description 5
- 239000011248 coating agent Substances 0.000 description 5
- 238000000576 coating method Methods 0.000 description 5
- 239000000498 cooling water Substances 0.000 description 5
- 230000008439 repair process Effects 0.000 description 5
- 230000008859 change Effects 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 230000002787 reinforcement Effects 0.000 description 3
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 230000006378 damage Effects 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 230000003247 decreasing effect Effects 0.000 description 2
- 230000003111 delayed effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000007572 expansion measurement Methods 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 239000004033 plastic Substances 0.000 description 2
- 238000004062 sedimentation Methods 0.000 description 2
- 239000002918 waste heat Substances 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000000571 coke Substances 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000010485 coping Effects 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 239000000295 fuel oil Substances 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 230000020169 heat generation Effects 0.000 description 1
- SZVJSHCCFOBDDC-UHFFFAOYSA-N iron(II,III) oxide Inorganic materials O=[Fe]O[Fe]O[Fe]=O SZVJSHCCFOBDDC-UHFFFAOYSA-N 0.000 description 1
- 238000000691 measurement method Methods 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 239000012495 reaction gas Substances 0.000 description 1
- 239000011819 refractory material Substances 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 230000008719 thickening Effects 0.000 description 1
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Classifications
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B15/00—Obtaining copper
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B5/00—General methods of reducing to metals
- C22B5/02—Dry methods smelting of sulfides or formation of mattes
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D19/00—Arrangements of controlling devices
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D21/00—Arrangements of monitoring devices; Arrangements of safety devices
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- General Engineering & Computer Science (AREA)
- Manufacture And Refinement Of Metals (AREA)
- Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
Abstract
Provided is a method for operating a metal refining furnace, which can suppress deformation of a furnace body due to expansion of a refractory of the metal refining furnace. Displacement meters (8) are arranged around the furnace body (2) at predetermined intervals‑1～8‑42) The displacement of the entire furnace body (2) is periodically measured at a predetermined timing, and when the displacement at least one position exceeds a preset upper limit value, control is performed to lower the operating temperature in the furnace body (2) so that the displacement of the furnace body (2) is equal to or less than the upper limit value, and the update timing of the furnace body (2) is determined based on the residual linear expansion coefficient of the furnace body (2) and the displacement limit of the frame constituting the furnace. As a result, the expansion and deformation of the furnace body (2) can be maintained within a predetermined range, and the furnace material can be renewed at an appropriate timing.
Description
Technical Field
The present invention relates to a method for operating a metal refining furnace, and more particularly, to a method for operating a metal refining furnace, which can suppress deformation of a furnace body due to expansion of a refractory, in a metal refining furnace such as a flash smelting furnace in copper refining.
Background
As shown in fig. 6, a metal refining furnace in metal refining, for example, a flash smelting furnace 100 in copper refining is composed of a reaction tower 101, a settling tank 102, and an uptake 103, and 1 to 3 concentrate nozzles 104 and 104 are provided in the reaction tower 101. And, the concentrate is instantaneously chemically reacted with oxygen-enriched air or hot blast air at high temperature while being simultaneously blown, and the concentrate is separated into matte and slag using a difference in specific gravity. The flash smelting furnace 100 is characterized by a low specific fuel consumption compared to other methods because it uses the oxidation reaction heat of the concentrate. Depending on the quality and composition of the raw material to be treated, there is a possibility that the heat is insufficient only by the heat of oxidation reaction, and therefore, combustion is sometimes supported by heavy oil or the like from the concentrate burners 104 and 104.
The matte usually contains 60 to 70% copper, and is taken out from a plurality of matte tap holes 105, 105 connected to the vicinity of the bottom of the flash smelting furnace 100. On the other hand, the slag contains about 1% of copper, and is taken out from a slag tap hole 106 provided on the lower portion side of the uptake shaft 103, sent to a smelting furnace 120, and smelted, and the copper contained in the slag is recovered as matte and treated in a converter together with the matte taken out from the flash smelting furnace 100. Then, electrolytic copper with high quality is further produced by electrolytic purification.
The interior of a casing (vessel) of a copper refining furnace represented by a flash smelting furnace is mainly composed of refractory bricks and unshaped refractories. The refractory has the following properties: when the operation is stopped for a long period of time as in the case of regular repair (cold repair), the expansion is brought into a low-temperature state and the contraction is caused. As for the deformation of the furnace body due to the thermal expansion of the refractory as described above, it is necessary to confirm the deformation state in accordance with the deterioration of the soundness of the furnace body. Further, if the high temperature state and the low temperature state are repeated, the residual linear expansion of the refractory does not return to the original size even if the refractory contracts in the low temperature state, and thus the expansion gradually increases. Therefore, the shorter the cycle time for performing the cold repair, the greater the deformation and displacement of the furnace body frame holding the refractory due to the residual linear expansion of the refractory. Further, when a specific component in the refractory, for example, MgO or CaO, comes into contact with water, a hydrate is formed, and the refractory rapidly expands, and in the worst case, the refractory is broken, that is, so-called aged. The expansion of the refractory as described above may cause the following failures: the risk of hot water leakage due to the destruction of the arrangement of the refractory bricks on the hearth or the formation of voids increases, and the furnace frame is damaged.
Therefore, conventionally, the expansion of the furnace body is monitored by marking a predetermined portion of the furnace body with a reference point such as a column of a building in which the furnace body is installed, and periodically measuring the distance from the reference point to the mark. For example, patent document 1 discloses a method for measuring the expansion of a coke oven body.
Prior patent document
Patent document 1: japanese laid-open patent publication No. 9-26309
Disclosure of Invention
Problems to be solved by the invention
However, in the conventional method, since the measurement point is narrowed down to a representative portion of the furnace body and marked, there is a problem that it is difficult to notice the change. Therefore, the development of expansion and deformation of the furnace body is delayed, and the coping with reinforcement is delayed, which may cause cracking or breakage of the members constituting the furnace body.
Further, for example, the furnace expansion measurement method shown in patent document 1 is only for finding the expansion and deformation of the furnace body, and even when the expansion and deformation of the furnace body can be found early, the furnace expansion measurement method can deal with the repair or the like only at an appropriate timing, and does not suppress or control the expansion and deformation of the furnace body itself.
The present invention has been made in view of the above problems, and an object of the present invention is to provide a method for operating a metal refining furnace, which can suppress the occurrence of troubles such as an increase in the risk of hot water leakage and deformation and breakage of a furnace frame due to damage of the arrangement of refractory bricks on the hearth by maintaining the expansion and deformation of the furnace body within an appropriate range.
Another object of the present invention is to provide a method for operating a metal refining furnace, which can monitor changes in furnace length associated with an increase in the age of the furnace and update the furnace burden at an appropriate timing.
Means for solving the problems
In order to solve the above-described problems, the present invention according to claim 1 is a method for operating a metal refining furnace for maintaining the expansion and deformation of a furnace body within a predetermined range, wherein displacements at a plurality of predetermined positions of the furnace body are measured by a plurality of displacement meters, respectively, and when the displacement at least at one position exceeds a preset upper limit value, the operating temperature in the furnace body is lowered so that the displacement is equal to or less than the upper limit value.
In order to solve the above problem, the present invention described in claim 2 is based on the method for operating a metal refining furnace described in claim 1, wherein when the displacement exceeds a preset upper limit value, the operating temperature in the furnace body is lowered by any one or any combination of the following a to E: A. increasing the mixing ratio of the raw materials with smaller heating value aiming at the raw materials loaded into the furnace body; B. reducing the amount of raw material charged into the furnace body per unit time; C. cooling the furnace body; D. a furnace environment in which a self-coating (self-coating) is easily formed by adjusting the amount of a reducing agent to be charged; and E, reducing the copper quality in the matte layer, namely, the Matte Grade (MG).
In order to solve the above problem, the present invention according to claim 3 is based on the method of operating a metal refining furnace according to claim 1 or 2, wherein the displacement meters are disposed at predetermined intervals around the furnace body, and measure the displacement of the entire furnace body.
In order to solve the above problem, the present invention according to claim 4 is based on the method of operating a metal refining furnace according to claim 3, wherein the displacement meter measures displacement of each column supporting the side wall of the furnace body.
In order to solve the above problem, the present invention according to claim 5 is based on the method of operating a metal refining furnace according to any one of claims 1 to 4, wherein the upper limit value is a displacement not exceeding an elastic limit at which a frame constituting the furnace body is plastically deformed by a load applied to the frame due to the displacement of the furnace body.
In order to solve the above problem, the present invention according to claim 6 is based on the method for operating a metal refining furnace according to any one of claims 1 to 5, wherein the various furnace materials forming the furnace body are updated when a residual linear expansion coefficient of the furnace body calculated from a measurement value of the displacement gauge exceeds a predetermined ratio.
Effects of the invention
According to the method for operating a metal refining furnace of the present invention, the operation within the plastic deformation range of the furnace frame can be performed, and the expansion and deformation of the furnace can be maintained within appropriate ranges.
Further, the present invention has an effect that the furnace material can be renewed at an appropriate timing by monitoring the change in the furnace length accompanying the increase in the age.
Drawings
Fig. 1 is a plan view showing the structure of a metal refining furnace according to a preferred embodiment for carrying out the operation method of the present invention.
Fig. 2 is a sectional view a-a of the metal refining furnace of fig. 1.
FIG. 3 is a front view of the water jacket.
Fig. 4 is a block diagram showing the configuration of a control device that performs various controls based on the output of the displacement meter.
Fig. 5 is a flowchart of an embodiment of the method of operating the metal refining furnace according to the present invention.
Fig. 6 is a front sectional view showing an example of the flash smelting furnace in copper refining.
Detailed Description
Hereinafter, the operation method of the metal refining furnace according to the present invention will be described in detail based on preferred embodiments. First, before describing the method of operating the metal refining furnace according to the present invention, the structure of the metal refining furnace to which the present invention is applied will be described. Fig. 1 is a plan view showing a structure of a metal refining furnace according to a preferred embodiment for carrying out the operation method of the present invention, and fig. 2 is a sectional view taken along a line a-a of the metal refining furnace shown in fig. 1.
[ Structure of Metal refining furnace ]
The illustrated metal refining furnace 1 is a so-called flash smelting furnace, and is generally configured by a reaction tower 3 provided on one end side, an uptake 4 provided on the other end side, and a settling tank 5 located at an intermediate portion between the reaction tower 3 and the uptake 4 to constitute a furnace body 2, and the furnace body 2 is formed by a casing (tank) entirely formed of a metal material such as steel. A plurality of supports 2a and 2a are disposed at predetermined intervals so as to surround the furnace body 2, and serve as reinforcements for securing necessary strength.
The reaction shaft 3 has a substantially cylindrical shape and a plurality of concentrate injection nozzles 6, 6 are arranged in the upper part thereof. And a preheating air injection opening 7 is provided adjacent to the concentrate burner 6, 6. The sedimentation tank 5 is formed by connecting a plurality of water cooling jackets 30 as shown in fig. 3. The water jacket 30 includes a plurality of cooling pipes 32, 32 through which cooling water circulates, water feed ports 33, 33 through which cooling water is supplied are provided on one end sides of the cooling pipes 32, respectively, and water discharge ports 34, 34 through which cooling water is discharged are provided on the other end sides of the cooling pipes 32, respectively. A plurality of ribs, not shown, are formed on the surface inside the furnace, and refractory bricks, not shown, are stacked on the ribs. The uptake duct 4 guides the exhaust gas inside to a waste heat boiler to recover waste heat, and conveys the cooled exhaust gas to a sulfuric acid plant.
A required number (42 in the present embodiment) of displacement meters 8 (hereinafter, also referred to as "displacement meters 8") are arranged around the furnace body 2 at predetermined intervals so as to surround the furnace body 2-1～8-42". ). The displacement meter 8 measures the displacement of the entire furnace body 2. In the present embodiment, the displacement meter 8-1～8-42Each of the pillars 2a is disposed to face each of the 42 pillars 2a of the furnace body 2 disposed on the bottom layer of the furnace having a large expansion. The number of the displacement meters 8 and 8 is not limited to 42, and is determined appropriately according to the shape, size, and the like of the furnace body 2. The measurement of the displacement is not limited to the support column 2a, and the appropriate position of the furnace body 2 can be marked.
Displacement meter 8-1～8-42The sensor is an optical or physical sensor that measures the displacement (expansion) of the furnace body 2, and outputs an electric signal obtained by converting the measured displacement of the furnace body 2 into a length. Displacement meter 8-1～8-42Examples of the method include a non-contact method such as a laser focusing method, an ultrasonic method, and a triangular distance measurement method, and a differential pressure type contact method.
Fig. 4 is a block diagram showing the configuration of a control device that performs various controls based on the output of the displacement meter. The control device 10 is composed of a CPU, a memory, etc., and acquires the displacement meter 8 at regular intervals-1～8-42The measured measurement value is provided with an arithmetic unit 11 having a program for executing the flow shown in fig. 5 based on the measurement value. That is, the control unit 10 monitors the displacement meter 8-1～8-42Whether the measured displacement (expansion) of the furnace body 2 is within the range of the preset upper limit or not and, when the displacement (expansion) of the furnace body 2 exceeds the preset upper limit of the displacement, control for lowering the operating temperature is performed so that the displacement (expansion) becomes equal to or less than the upper limit value. In addition, the following control system is provided to perform control for lowering the operating temperature. That is, the control device 10 includes: a raw material mixing control unit 12 that increases the mixing ratio of the raw material with a small calorific value, for example, iron oxide slag, with respect to the raw material charged into the furnace body 2, based on the instruction from the operation unit 11; a charge amount control unit 13 for controlling the charge amount of the concentrate per unit time based on the instruction from the operation unit 11; a cooling control unit 14 that cools the furnace body 2 based on a command from the arithmetic unit 11; and a reducing agent input control unit 15 for controlling the input amount of the reducing agent to be input into the furnace based on the instruction of the calculation unit 11.
Here, the upper limit value is a displacement as follows: the displacement not exceeding the elastic limit at which the support 2a is plastically deformed by the load applied to the frame constituting the furnace body 2, for example, the support 2a, due to the displacement of the furnace body 2 is preferably a displacement having a certain margin, for example, a margin of 10% with respect to the elastic limit. That is, since the refractory expands when heated and contracts when the temperature decreases, the displacement becomes smaller than that during operation but the properties of the refractory do not return as early as before when the operation is stopped, and the displacement during heating becomes larger during repeated heating and cooling, and the displacement gradually becomes larger even when the cooling is performed. This is because, when the elastic limit of the support 2a is exceeded, the support 2a is plastically deformed by the load applied to the frame constituting the furnace body 2, for example, the support 2a, due to the displacement of the furnace body 2, the furnace body 2 is maintained in a deformed state even if the operating temperature is lowered.
As control for lowering the operation temperature, the raw material mix control unit 12 increases the amount of iron oxide slag supplied to the concentrate in the raw material mixing device 22 that mixes the concentrate with a raw material having a small heat generation amount, for example, iron oxide slag, the charge amount control unit 13 controls the operation of the concentrate charging device 23 that charges the concentrate so that the charge amount per unit time decreases, the cooling control unit 14 increases the amount and/or flow rate of cooling water supplied into the water jacket 30 so as to promote cooling of the furnace bottom, and the reducing agent charge control unit 15 adjusts the charge amount of the reducing agent charged into the furnace from the reducing agent charging device 24. In the cooling of the furnace bottom portion, the furnace bottom portion may be cooled by controlling the output of a fan, not shown, which blows cool air toward the furnace bottom portion by the cooling control portion 14, or the temperature in the furnace may be adjusted by reducing the oxygen concentration of the reaction gas supplied into the furnace. The reducing agent is fed from a plurality of positions in the furnace body, and for example, by reducing or stopping the amount of the reducing agent fed to a region having a high temperature, the thickness of the self-coating layer of the magnetite main body formed on the inner wall of the region is increased, and therefore, the furnace temperature in the region can be locally lowered. Further, the control can be performed based on the quality of the desired metal in the matte layer in which the desired metal is concentrated, that is, the Matte Grade (MG). For example, adjustment may be performed to reduce the amount of heat generated by reducing the MG, thereby reducing the operating temperature in the furnace.
[ method of operating Metal refining furnace ]
Next, an embodiment of the method for operating a metal refining furnace according to the present invention will be described. Fig. 5 is a flowchart of an embodiment of the method of operating the metal refining furnace according to the present invention. First, at the start of the operation, the displacement meters 8 are aligned with each other-1～8-42The respective supports 2a, 2a of the furnace body 2 are measured at predetermined time intervalsThe displacement accompanying the local expansion is measured (step S1), and the measured value is input to the arithmetic unit 11. The computing unit 11 monitors whether or not each displacement meter 8 is present-1～8-42At least one of them is within the range of the upper limit value of the displacement set in advance. Next, the arithmetic unit 11 of the control device 10 determines that at least one displacement meter 8 is present-1～8-42When the upper limit value is exceeded (yes in step S2), the operation temperature is controlled to be lowered (step S3) so that the displacement amount is equal to or lower than the upper limit by any one or any combination of the following (a) to (E): (A) the raw material mixing control unit 12 controls the operation of the raw material mixing device 22 so as to increase the mixing ratio of the raw materials with a small calorific value to the raw materials charged into the furnace body 2; (B) the charge amount control unit 13 controls the operation of the concentrate charging device 23 so that the charging amount per unit time of the raw material charged into the furnace body 2 is decreased (for example, decreased from 210t/h to 170 t/h); (C) the cooling control unit 15 adjusts the amount of cooling water in the water jacket 30 so as to lower the temperature of the furnace body 2; (D) the reducing agent input control unit 15 controls the operation of the reducing agent input device 24 so that the amount of reducing agent to be input into the furnace body 2 is reduced or stopped, thereby promoting self-coating of the furnace inner wall and thickening the furnace inner coating; (E) the MG of the desired metal in the matte layer is reduced. The reducing agent supply controller 15 can locally control the thickness of the self-coat layer by adjusting the supply amount of the reducing agent to only the reducing agent supply device 24 disposed in a region with a high temperature, among the plurality of reducing agent supply devices 24.
Since the displacement of the furnace body 2 can be maintained within an appropriate range by the control as described above, the change in furnace length associated with the increase in the age can be monitored, and as a result, the operation can be performed within the range of plastic deformation of the furnace body 2, that is, the components of the furnace body 2 can be managed without being broken, and countermeasures such as reinforcement can be taken before hot water leaks or the breakage of the components of the furnace body occurs. Moreover, the risk of hot water leakage is reduced, and the service life of the furnace body is prolonged. In addition, even when local expansion is observed, the risk of hot water leakage in this portion can be reduced by enhancing cooling in the vicinity of this region.
Each displacement meter 8 is controlled by the above-mentioned control-1～8-42When the measured value of (2) is equal to or less than the upper limit value (YES at step S4), the control unit 10 sends commands to the raw material mixture control unit 12, the charge amount control unit 13, and the cooling control unit 14 so that the preset normal operation is performed, and the operation is continued within an appropriate range in which the operation temperature is equal to or less than the upper limit value (step S5). On the other hand, each displacement meter 8 is controlled by the above-mentioned control-1～8-42If the measured value of (2) has not become equal to or less than the upper limit value (NO in step S4), the process of step S3 is continued.
By continuing the above-described operation, the displacement meter 8 is operated in accordance with the respective displacements-1～8-42When the residual linear expansion coefficient of the furnace body 2 calculated from the measured value of (a) exceeds a predetermined ratio, various furnace materials forming the furnace body 2 are updated. Here, as described above, when the load applied to the support column 2a exceeds the elastic limit for plastically deforming the support column 2a, the displacement does not return as early even when the furnace body 2 is cooled, and therefore, the residual linear expansion coefficient, which is a standard for updating various furnace materials, is preferably set to a ratio not exceeding at least the elastic limit for plastically deforming the support column 2 a.
As described above, according to the method of operating the metal refining furnace of the present embodiment, the displacement meter 8 is used to control the operation of the metal refining furnace-1～8-42When the displacement (expansion) of the furnace body 2, for example, the displacement of each of the pillars 2a supporting the side wall of the furnace body 2 is measured and the displacement at least one position exceeds a preset upper limit value, the control device 10 lowers the operating temperature in the furnace body 2 or lowers the operating temperature by increasing the coating thickness in a region exceeding the upper limit value so that the displacement becomes the upper limit value or less, and therefore, the expansion and deformation of the furnace body 2 can be maintained within an appropriate range, and the occurrence of cracks, breakage of the arrangement of the refractory bricks at the bottom of the furnace, and the like due to the thermal expansion of the furnace body 2 can be prevented.
In addition, according to the method of operating the metal refining furnace of the present embodiment, the displacement gauge 8 is passed around the furnace body 2 at predetermined intervals-1～8-42Since the displacement of the entire furnace body 2 is measured, the change in furnace length can be monitored at any time, and the furnace material can be updated at an appropriate timing.
Further, according to the method of operating the metal refining furnace of the present embodiment, when the residual linear expansion coefficient of the furnace body exceeds the predetermined ratio, the various furnace materials forming the furnace body can be renewed and renewed before a serious problem occurs, and therefore, there is an effect that the operation stop time can be shortened and the repair cost can be reduced.
[ other embodiments ]
The present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the technical spirit of the present invention.
Description of reference numerals:
1 Metal refining furnace
2 furnace body
2a pillar
3 reaction tower
4 rising flue
5 sedimentation tank
6 concentrate nozzle
7 preheating air inlet
8 displacement meter
10 control device
11 arithmetic unit
12 raw material mixing control part
13 load control unit
14 cooling control part
15 reducing agent input control unit
22 raw material mixing device
23 concentrate charging device
24 reducing agent feeding device
30 water cooling jacket
Claims (5)
1. A method of operating a metal refining furnace for maintaining the expansion and deformation of a furnace body within a predetermined range,
measuring displacements at a plurality of predetermined positions of the furnace body by a plurality of displacement meters,
when the displacement at least one position exceeds a preset upper limit value, the operating temperature in the furnace body is reduced so that the displacement is less than or equal to the upper limit value,
in the case where the displacement exceeds a preset upper limit value, the operating temperature in the furnace body is lowered by any one or any combination of the following a to E:
A. increasing the mixing ratio of the raw materials with smaller heating value aiming at the raw materials loaded into the furnace body;
B. reducing the amount of raw material charged into the furnace body per unit time;
C. cooling the furnace body;
D. a furnace environment in which a self-coating layer is easily formed by adjusting the amount of a reducing agent to be charged; and
E. the copper quality in the matte layer, namely, the Matte Grade (MG), is reduced.
2. The method of operating a metal refining furnace according to claim 1,
the displacement meters are disposed at predetermined intervals around the furnace body, and measure the displacement of the entire furnace body.
3. The method of operating a metal refining furnace according to claim 2,
the displacement meter measures the displacement of each column supporting the side wall of the furnace body.
4. The method of operating a metal refining furnace according to any one of claims 1 to 3,
the upper limit value is a displacement not exceeding an elastic limit at which a frame constituting the furnace body is plastically deformed by a load applied to the frame due to the displacement of the furnace body.
5. The method of operating a metal refining furnace according to any one of claims 1 to 3,
when the residual linear expansion coefficient of the furnace body calculated from the measurement value of the displacement meter exceeds a predetermined ratio, the various furnace materials forming the furnace body are updated.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2018029338A JP6913043B2 (en) | 2018-02-22 | 2018-02-22 | How to operate a metal smelter |
| JP2018-029338 | 2018-02-22 | ||
| PCT/JP2019/005123 WO2019163607A1 (en) | 2018-02-22 | 2019-02-13 | Operating method for metal refining furnace |
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| JPS60110821A (en) * | 1983-11-17 | 1985-06-17 | Mitsubishi Metal Corp | Device for monitoring body of continuous copper making furnace |
| JPS6055575B2 (en) * | 1983-11-17 | 1985-12-05 | 三菱マテリアル株式会社 | Furnace body monitoring device in continuous copper making furnace |
| JPS60110819A (en) * | 1983-11-17 | 1985-06-17 | Mitsubishi Metal Corp | Device for monitoring body of continuous copper making furnace |
| JPH02187592A (en) * | 1989-01-12 | 1990-07-23 | Nissan Motor Co Ltd | High temperature atmosphere furnace |
| JP4212169B2 (en) * | 1999-01-06 | 2009-01-21 | 三井金属鉱業株式会社 | Insulation / heating method for copper smelting flash furnace |
| EP1580283A1 (en) * | 2004-03-26 | 2005-09-28 | Paul Wurth S.A. | Method for protecting a tuyere assembly and a refractory lining of a furnace |
| JP4056534B2 (en) * | 2005-04-28 | 2008-03-05 | 三菱重工業株式会社 | Furnace bottom temperature measuring method and apparatus, and melting furnace bottom monitoring method and apparatus |
| JP5235308B2 (en) * | 2007-01-25 | 2013-07-10 | 三菱重工環境・化学エンジニアリング株式会社 | Externally heated rotary kiln |
| JP4911203B2 (en) * | 2009-07-23 | 2012-04-04 | 株式会社村田製作所 | In-furnace temperature measurement method, in-furnace temperature measurement device, heat treatment device, and calcining synthesis method of ceramic raw material powder |
| JP5987605B2 (en) * | 2011-09-28 | 2016-09-07 | Ｊｆｅスチール株式会社 | Coke oven wall diagnosis method and coke oven wall repair method |
| CN202730159U (en) * | 2012-07-21 | 2013-02-13 | 武钢集团昆明钢铁股份有限公司 | Blast furnace body expansion measurement device |
| JP5867449B2 (en) * | 2013-05-07 | 2016-02-24 | Ｊｆｅスチール株式会社 | Coke oven wall diagnosis method and coke oven wall repair method |
| CN203393178U (en) * | 2013-08-17 | 2014-01-15 | 武钢集团昆明钢铁股份有限公司 | Furnace body-furnace top operation platform matched structure with furnace body displacement monitoring function |
| CN204022861U (en) * | 2014-08-05 | 2014-12-17 | 甘肃酒钢集团宏兴钢铁股份有限公司 | A kind of last furnace shell deformation of cylindrical monitoring device |
| JP6197837B2 (en) * | 2014-08-08 | 2017-09-20 | Ｊｆｅスチール株式会社 | Coke oven length measurement method and coke oven furnace deterioration evaluation method |
| CN106839966A (en) * | 2017-03-20 | 2017-06-13 | 中国恩菲工程技术有限公司 | For the furnace expansion displacement detection system of metallurgical industrial furnace |
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| JP2019143209A (en) | 2019-08-29 |
| WO2019163607A1 (en) | 2019-08-29 |
| CN110475881A (en) | 2019-11-19 |
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