JP5561235B2 - Operation method of self-smelting furnace and self-smelting furnace - Google Patents

Description

  The present invention relates to a method for operating a self-melting smelting furnace and a self-melting smelting furnace in which a part of a reaction gas is blown into a reaction tower from the side wall of the reaction tower.

  One smelting furnace that uses sulfide concentrate as a raw material is a self-smelting furnace called a self-smelting furnace. The auto-smelting furnace is, for example, a reaction tower with a concentrate burner at the top, a settler with one end connected to the lower part of the reaction tower, a slag hole and a mat hole on the side, and the other end of the settler. And a flue path connected to the.

In the operation method of smelting smelting raw material using a self-melting smelting furnace, the smelting raw material consisting of smelting concentrate, flux, auxiliary fuel, etc., together with the preheated reaction gas, from the concentrate burner to the reaction tower Be blown into. In the reaction tower, sulfur and iron, which are combustible components of the smelting raw material, react with the high-temperature reaction gas and become a melt and are stored in the settler. In the settler, the melt is divided into a river, which is a mixture of Cu ₂ S and FeS, and a calami mainly composed of 2FeO · SiO _{2 according} to the specific gravity difference. The calami is discharged from the calami outlet and introduced into the smelting furnace. An appropriate amount of river is extracted from the mat hole in response to a request from the converter, which is the next process.

  The high-temperature exhaust gas generated in the reaction tower is cooled by the exhaust heat boiler through the settler and the flue. The calami that has entered the electric smelting furnace is heated and held by the electric heat energized by the electrodes, and if necessary, mixed with massive ore or bulk flux inserted into the electric smelting furnace. Only the calories that settle and contain the remaining copper are discharged out of the furnace through the outlet.

  In such a self-melting smelting furnace, it is important to complete the reaction while the smelting raw material falls in the reaction tower. If the reaction is not completed, a part of the unreacted raw material of the smelting material is scattered with the high-temperature exhaust gas, becomes smoke ash, and is deposited and fixed in the exhaust heat boiler. Moreover, a part of the unreacted material of the smelting raw material is deposited on the melt surface at the lower part of the reaction tower as unmelted material.

  When the generation rate of smoke ash increases, it is necessary to increase the auxiliary fuel for melting smoke ash, which increases the cost. In addition, the smoke ash fixed in the exhaust heat boiler gradually grows to lower the electric heat efficiency of the boiler, and may peel off and fall to destroy the exhaust heat boiler. Moreover, the unmelted material of the smelting raw material deposited on the surface of the melt hinders the generation of calami and causes the temperature of calami and the quality of calami to fluctuate.

  In order to avoid such a situation, smelting raw material and reaction gas are uniformly mixed in the reaction tower, and the smelting raw material is completely reacted. Has been proposed.

  For example, Patent Document 1 describes a method in which a reaction gas is blown into a reaction tower on a side wall of a reaction tower in a self-melting smelting furnace having a concentrate burner at the top. In the method described in Patent Document 1, uniform mixing of the smelting raw material and the reaction gas in the reaction tower is ensured without causing deterioration in operability and damage to each part of the furnace body, and smelting The residence time in the tower of the raw material is extended, and the concentrate reaction (reaction in which sulfur and iron, which are combustible components of the smelting raw material, react with the reaction gas to form a melt) is promoted.

  By the way, for example, a coating layer for protecting bricks constituting the side wall of the reaction tower is formed inside the side wall of the reaction tower of the auto-smelting furnace (see, for example, Patent Document 2). The coaching layer is formed, for example, when an oxide generated by the reaction between the concentrate in the smelting raw material and the reaction gas adheres to the reaction tower side wall.

  However, if the coating layer grows too much, the volume in the auto-smelting furnace decreases, and the amount of concentrate melted decreases. On the other hand, if the coating layer is reduced too much, for example, bricks constituting the side walls of the reaction tower may be melted, and as a result, the auto smelting furnace may not be operated.

  Therefore, in order to enable a long-term continuous operation of the stable auto-smelting furnace, it is important to maintain the coating layer formed on the inner side wall of the reaction tower at an appropriate thickness.

Japanese Patent Laid-Open No. 01-252734 Japanese Unexamined Patent Publication No. 07-54058

  Therefore, the present invention has been proposed in view of such a situation, and the operation method of the auto-smelting furnace capable of controlling the coating layer formed inside the side wall of the reaction tower to an appropriate thickness. And it aims at providing a self-smelting furnace.

A method of operating a self-smelting furnace according to the present invention includes a concentrate burner that is provided at the top and supplies a smelting raw material together with fuel and a reaction gas, and a blowing nozzle that is attached to a side wall and blows the reaction gas. In the method of operating a self-melting smelting furnace using a self-melting smelting furnace having at least a reaction tower comprising: detecting the amount of heat dissipated from the side wall on which the coating layer of the reaction tower is formed; When it becomes larger than a predetermined threshold value, the reaction blown from the blowing nozzle while keeping the total amount of the reaction gas blown from the concentrate burner and the reaction gas blown from the blowing nozzle constant. the use amount of gas, less than blown reaction gas quantity from the purified ore burner, if the dissipation heat from the reactor is smaller than the predetermined threshold, the total amount of the reaction gas quantity While staying constant And blown reaction gas quantity from the blowing nozzle, is characterized in that the same and blown reaction gas quantity from the purified mineral burner.

Further, the self-melting smelting furnace according to the present invention comprises a concentrate burner provided at the top for supplying a smelting raw material together with fuel and a reaction gas, and a blow nozzle attached to a side wall for blowing the reaction gas. In a self-melting smelting furnace having at least a reaction tower equipped with, when the amount of heat dissipated from the side wall where the coating layer of the reaction tower is formed is detected, and the amount of heat dissipated is greater than a predetermined threshold, While keeping the total amount of the reaction gas blown from the concentrate burner and the reaction gas blown from the blow nozzle, the reaction gas blown from the blow nozzle is blown from the concentrate burner. less than the reaction gas quantity, if the dissipation heat from the reactor is smaller than the predetermined threshold, while a constant total amount of the reaction gas quantity, blown reaction from air blowing nozzles Gas When, it is characterized in that a control device and blown reaction gas quantity from the purified mineral burner is controlled to be the same.

  According to the present invention, the coating layer formed inside the side wall of the reaction tower can be controlled to an appropriate thickness.

It is sectional drawing which shows the structural example of the self-smelting furnace used with the operating method of a self-smelting furnace. It is sectional drawing which shows the structural example of the reaction tower in a self-smelting furnace. It is sectional drawing which shows the structural example of the concentrate burner in a self-smelting furnace. It is a block diagram which shows the structural example of the control apparatus which controls the reaction gas supply part and reaction gas supply part which supply reaction gas in a reaction tower, the reaction tower. It is a flowchart for demonstrating an example of the operation method of a self-smelting furnace. It is a graph which shows the change of the dissipated heat in a self-smelting furnace when changing the ratio of the amount of reaction gas blown from a concentrate burner, and the amount of reaction gas blown from a ventilation nozzle.

Hereinafter, an example of an embodiment to which the present invention is applied (hereinafter referred to as “the present embodiment”) will be described in the following order with reference to the drawings.
1. Auto-smelting furnace 2. 2. Operation method of auto smelting furnace Example

<1. Self-smelting furnace>
FIG. 1 is a cross-sectional view showing a configuration example of a self-smelting smelting furnace used in the method for operating a self-smelting smelting furnace according to the present embodiment. As shown in FIG. 1, the auto-smelting furnace 1 includes, for example, a reaction tower 2, a settler 3 having one end connected to the lower part of the reaction tower 2, and provided with slag holes 5 and mat holes 7 on the side surfaces, A flue passage 8 connected to the other end of the settler 3. In the self-melting smelting furnace 1, for example, smelting raw materials (copper concentrate, coke, flux, etc.) of 2300 to 3500 t / day can be processed.

  FIG. 2 is a cross-sectional view showing a configuration example of the reaction tower 2 in the auto-smelting furnace 1. For example, as shown in FIG. 2, the reaction tower 2 includes a concentrate burner 10 provided at the top, and a blowing nozzle 12 that is attached to the side wall and blows the reaction gas 11. In the reaction tower 2, for example, a smelting raw material, fuel, and reaction gases 11 and 11 ′ are supplied, and a jet stream is formed by the reaction gas 11 to form sulfur and iron as combustible components of the smelting raw material. Reacts with the reaction gas 11 to form a melt (concentrate reaction).

  FIG. 3 is a cross-sectional view showing a configuration example of the concentrate burner 10 in the auto-smelting furnace 1. FIG. 4 is a block diagram illustrating a configuration example of the reaction tower 2, a reaction gas supply unit 15 that supplies the reaction gas 11, 11 ′ into the reaction tower 2, and a control device 16 that controls the reaction gas supply unit 15. FIG. The concentrate burner 10 includes a concentrate chute 20, a blower pipe 21, a burner cone 22, and a wind speed adjuster 23.

  The concentrate chute 20 is a tubular member for feeding the smelting raw material 24 into the reaction tower 2, and extends in the vertical direction toward the reaction tower 2. An auxiliary fuel burner 25 for feeding auxiliary fuel for raising the temperature of the reaction gas 11 extends toward the reaction tower 2 at the center of the concentrate chute 20. A dispersion cone 26 is provided at the tip of the auxiliary fuel burner 25 at a position where the smelting raw material 24 fed from the concentrate chute 20 collides. The dispersion cone 26 disperses the smelting raw material 24 so as to easily come into contact with the reaction gas, and prevents the generation of so-called heap (lumps of undissolved material).

  The blower pipe 21 is a tubular structure that is provided in a state of surrounding the concentrate chute 20, that is, including the concentrate chute 20. The blower tube 21 has a diameter reduced downward from a predetermined position in the tube. The blower pipe 21 introduces the reaction gas 11 supplied from the reaction gas supply unit 15 into the reaction tower 2.

  The burner cone 22 has, for example, a tubular structure, and the upper end thereof is connected to the lower end of the blower pipe 21, so that the smelting raw material 24 and the reaction gas 11 can be fed into the reaction tower 2. ing.

  The wind speed adjuster 23 is provided between the concentrate chute 20 and the blower pipe 21, for example, on the outer periphery of the concentrate chute 20, and the flow of the reaction gas 11 formed by the concentrate chute 20 and the blower pipe 21. The road width is reduced to a predetermined size, for example, a substantially cylindrical shape. The wind speed regulator 23 thus formed makes it possible to adjust the flow rate of the reaction gas 11 to a predetermined speed. The wind speed adjuster 23 is movable so as to move in the direction along the axis of the concentrate chute 20. By moving in the direction along the axis of the concentrate chute 20, the flow rate of the reaction gas 11 is increased. Can be adjusted.

  For example, at least one set of the blowing nozzles 12 is attached at positions that are symmetrical with respect to the vertical line passing through the reaction tower center point between the side walls of the reaction tower 2 so as to face the vertical line direction. The working gas 11 ′ is blown into the reaction tower 2. The reaction gas 11 ′ sent from the blow nozzle 12 is supplied from the same reaction gas supply unit 15 as the reaction gas 11 sent from the concentrate burner 10. In this way, the reaction gas 11 ′ is blown from the side wall of the reaction tower 2 into the reaction tower 2, not only from the concentrate burner 10, thereby forming the reaction gas 11 blown from the concentrate burner 10. The jet stream can be agitated and turbulent to increase the reaction efficiency between the particles of the smelting raw material 24 and the reaction gas 11. Further, the residence time of the smelting raw material 24 in the reaction tower 2 can be extended. By extending the residence time in this way, the reaction is completed while the smelting raw material 24 falls in the reaction tower 2, and a part of the unreacted material of the smelting raw material 24 is scattered with the high-temperature exhaust gas 13. It is possible to prevent smoke ash from being deposited and fixed in the exhaust heat boiler 14. Further, by extending the residence time during which the particles of the smelting raw material 24 can react with the reaction gas 11, a part of the unreacted material of the smelting raw material 24 becomes an unmelted material in the lower part of the reaction tower 2. Accumulation on the surface can be prevented.

  The blowing nozzle 12 may be fixed or movable at the mounting position, but is preferably provided at the center of the side wall of the reaction tower 2. When the blower nozzle 12 is provided on the ceiling of the reaction tower 2, the jet stream formed by the reaction gas 11 blown from the concentrate burner 10 is sufficiently stirred to spread the entire reaction tower 2 inside. Cannot be a flow. Further, when the blowing nozzle 12 is provided in the lower part of the reaction tower 2, the reaction gas 11 ′ is blown to a position where the jet flow is low, so that part or most of the turbulent flow is formed in the settler 3. , The chance of collision between the particles is reduced, and the contact between the particles and oxygen becomes insufficient. As a result, the melting reaction in which the smelting raw material 24 is melted is discharged from the settler 3 as smoke ash outside the furnace. Moreover, the particle | grains which fall on the melt surface of the settler 3 will increase.

  The reaction gas supply unit 15 stores the reaction gases 11 and 11 ′, supplies the reaction gas 11 into the reaction tower 2 through the blower pipe 21, and enters the reaction tower 2 through the blower nozzle 12. A reaction gas 11 ′ is supplied. Thus, the total amount of the reaction gas 11 and the reaction gas 11 ′ supplied from the reaction gas supply unit 15 is sent into the reaction tower 2. As the reaction gas 11, 11 ', air or oxygen-enriched air in which air and oxygen are mixed can be used.

  For example, the control device 16 is supplied with data of the amount of heat dissipated detected by a sensor (not shown) for detecting the heat dissipated installed in the reaction tower 2. As will be described in detail later, the control device 16 determines the amount of the reaction gas 11 blown from the blower pipe 21 of the concentrate burner 10 based on the data of the amount of heat dissipated detected by the sensor for detecting the dissipated heat, The reaction gas supply unit 15 is controlled so as to change the ratio with the amount of the reaction gas 11 ′ blown from the nozzle 12.

  The settler 3 functions as a holding container, and separates the smelted raw material 24 into slag (calami) 4 and mat (kawa) 6 by specific gravity difference, and the slag 4 layer and the mat 6 layer are separated. Form. The settler 3 is provided with a slag hole 5, and the slag 4 separated by the settler 3 is discharged through the slag hole 5 and introduced into the smelting furnace 30. Further, the settler 3 is provided with a mat hole 7, and the mat 6 separated by the settler 3 is discharged through the mat hole 7. The mat 6 is appropriately extracted from the mat hole 7 according to the demand in the batch process of the converter as the next step.

  The slag 4 extracted from the slag hole 5 is introduced into the smelting can furnace 30 through the rod 31 and the inlet 32. In the smelting furnace 30, the mat 6 suspended in the slag 4 is set while heating the slag 4 flowing from the self-melting smelting furnace 1, so that the slag 4 and the mat 6 are separated by the specific gravity difference. After the mat 6 settles on the furnace bottom, the mat 6 is led out of the smelting furnace 30 from the mat hole to, for example, a converter through a ladle for receiving the mat 6.

<2. Operation method of self-melting furnace>
Next, an example of the operation method of the auto-smelting furnace 1 will be described. In the self-melting smelting furnace 1, for example, a smelting raw material 24, which is a mixture of copper concentrate and flux (meteorite), is reacted with a reaction gas 11 from a concentrate burner 10 provided at the top of the reaction tower 2. 2 is blown into. The reaction gas 11 is also blown into the reaction tower 2 from the blow nozzle 12.

  The concentrate or the like blown into the reaction tower 2 is heated by the radiant heat in the furnace wall of the reaction tower 2, the heat of the auxiliary fuel, etc., and reacts with the reaction gases 11, 11 ′ to become a melt, and the settler 3 Accumulated inside.

  Here, as the coating layer formed on the side wall of the reaction tower 2 becomes thicker, that is, as the coating layer grows, the heat inside the reaction tower 2 becomes difficult to be transmitted to the outside of the reaction tower 2. The amount of heat dissipated from the tower 2 is reduced. On the other hand, as the coating layer formed on the side wall of the reaction tower 2 becomes thinner, that is, as the coating layer decreases, the heat inside the reaction tower 2 is easily transferred to the outside of the reaction tower 2. The amount of heat dissipated from 2 increases.

  Further, as described above, the concentrate particles in the smelting raw material 24 react with the reaction gas 11, and the concentrate particles are melted by the reaction heat to become high-temperature molten particles. When the molten particles collide with the coating layer, a smelting reaction proceeds between the molten particles and the coating layer, and the coating layer is dissolved.

  In this way, when the amount of concentrate melt particles in the smelting raw material 24 collides with the coating layer increases, the coating layer decreases, and the heat inside the reaction tower 2 is easily transferred to the outside of the reaction tower 2, The amount of heat dissipated from the reaction tower 2 is increased. In addition, when the amount of the concentrate molten particles colliding with the coating layer decreases, the coating layer grows and the heat inside the reaction tower 2 becomes difficult to be transmitted to the outside of the reaction tower 2. Becomes smaller.

  Therefore, in the operation method of the auto-smelting furnace 1 according to the present embodiment, the amount of heat dissipated from the reaction tower 2 is detected, and the reaction gas 11 blown from the concentrate burner 10 is detected according to the amount of heat dissipated. The ratio between the amount and the amount of the reaction gas 11 ′ blown from the blowing nozzle 12 is changed.

  Specifically, when the amount of heat dissipated from the reaction tower 2 detected by the sensor for detecting the dissipated heat is greater than a predetermined threshold, the control device 16 determines the reaction gas 11 blown from the concentrate burner 10. The amount of the reaction gas 11 ′ blown from the blow nozzle 12 is made to be blown from the concentrate burner 10 while the total amount of the amount and the amount of the reaction gas 11 ′ blown from the blow nozzle 12 is kept constant. Control is performed so that the amount is less than the amount of the gas 11. That is, the ratio of the amount of the reaction gas 11 blown from the concentrate burner 10 and the amount of the reaction gas 11 ′ blown from the blow nozzle 12 is controlled to be 2: 1.

  As described above, when the amount of heat dissipated from the reaction tower 2 becomes larger than a predetermined threshold value, that is, when the coating layer is excessively reduced, the amount of the reaction gas 11 ′ blown from the blow nozzle 12 is precisely adjusted. The amount is less than the amount of the reaction gas 11 blown from the mine burner 10. Thereby, since the quantity which the concentrate molten particle in the smelting raw material 24 collides with a coating layer decreases, a coating layer can be grown.

  In addition, when the amount of heat dissipated from the reaction tower 2 becomes smaller than a predetermined threshold, the control device 16 determines the amount of the reaction gas 11 blown from the concentrate burner 10 and the reaction gas blown from the blow nozzle 12. The amount of the reaction gas 11 ′ blown from the blowing nozzle 12 and the amount of the reaction gas 11 blown from the concentrate burner 10 are controlled to be the same while keeping the total amount with the amount of 11 ′ constant. To do. That is, the ratio of the amount of the reaction gas 11 blown from the concentrate burner 10 and the amount of the reaction gas 11 ′ blown from the blowing nozzle 12 is controlled to be 1: 1.

  Thus, when the amount of heat dissipated from the reaction tower 2 becomes smaller than a predetermined threshold value, that is, when the coating layer grows too much, the amount of the reaction gas 11 blown from the concentrate burner 10 and the air The amount of the reaction gas 11 ′ blown from the nozzle 12 is made the same. Thereby, since the quantity with which the molten particle of the concentrate in the smelting raw material 24 collides with a coating layer increases, a coating layer can be decreased.

  FIG. 5 is a flowchart for explaining an example of an operation method of the auto-smelting furnace 1.

  In step S <b> 1, the control device 16 controls the ratio of the amount of the reaction gas 11 blown from the concentrate burner 10 and the amount of the reaction gas 11 ′ blown from the blow nozzle 12 to be 2: 1. . As a result, the coaching layer is grown to prevent the coaching layer from being excessively reduced.

  In step S2, the control device 16 detects the amount of heat dissipated from the reaction tower 2, and determines whether or not the detected amount of heat dissipated is greater than a predetermined threshold value. When the amount of heat dissipated from the reaction tower 2 becomes larger than a predetermined threshold, the control device 16 executes the process of step S1. That is, the control device 16 keeps the total amount of the reaction gas 11 blown from the concentrate burner 10 and the reaction gas 11 ′ blown from the blow nozzle 12 from the concentrate burner 10 while keeping the total amount constant. Control is performed so that the ratio between the amount of the reaction gas 11 to be blown and the amount of the reaction gas 11 ′ to be blown from the blower nozzle 12 is 2: 1. On the other hand, when the amount of heat dissipated from the reaction tower 2 becomes smaller than a predetermined threshold, the control device 16 executes the process of step S3.

  In step S <b> 3, the control device 16 keeps the total amount of the reaction gas 11 blown from the concentrate burner 10 and the reaction gas 11 ′ blown from the blow nozzle 12, while keeping the total amount constant. The ratio of the amount of the reaction gas 11 blown from 10 and the amount of the reaction gas 11 ′ blown from the blowing nozzle 12 is controlled to be 1: 1. Thus, by controlling the ratio between the amount of the reaction gas 11 blown from the concentrate burner 10 and the amount of the reaction gas 11 ′ blown from the blower nozzle 12, the coating layer is melted and the coating layer is reduced. Thus, the thickness of the coating layer can be controlled to an appropriate thickness.

  As explained above, in the auto-smelting furnace 1, when the heat dissipated from the reaction tower 2 becomes larger than a predetermined threshold, the molten particles of the concentrate in the smelting raw material 24 collide with the coating layer. By increasing the amount to be applied, the overgrown coating layer can be reduced. As described above, in the auto-smelting furnace 1, since it is possible to prevent the coating layer from growing too much, for example, it is possible to prevent the melting amount of the smelting raw material 24 in the reaction tower 2 from decreasing. can do.

  Further, in the auto-smelting furnace 1, when the heat dissipated in the reaction tower 2 is smaller than a predetermined threshold, the amount of the molten particles of concentrate colliding with the coating layer is reduced to reduce the coaching which has been reduced too much. The layer can be grown. Thus, in the auto-smelting furnace 1, since it can prevent that a coating layer reduces too much, for example, the brick which comprises the side wall of the reaction tower 2 is melted, and an auto-smelting furnace It is possible to prevent 1 from becoming inoperable.

  The amount of the reaction gas 11, 11 'blown into the reaction tower 2 can be changed depending on the size of the auto-smelting furnace 1 used and the amount of concentrate to be processed. Moreover, the speed | rate which blows in the reaction gas 11 and 11 'from the concentrate burner 10 and the ventilation nozzle 12 can be suitably changed with the magnitude | size of the self-smelting furnace 1 to be used, and the amount of concentrate to process.

  In the flowchart shown in FIG. 5 described above, in step S1, the control device 16 calculates the amount of the reaction gas 11 blown from the concentrate burner 10 and the amount of the reaction gas 11 ′ blown from the blow nozzle 12. Although an example in which the ratio is controlled to be 2: 1 has been described, the present invention is not limited to this example. For example, in step S1, the control device 16 causes the ratio of the amount of the reaction gas 11 blown from the concentrate burner 10 and the amount of the reaction gas 11 ′ blown from the blow nozzle 12 to be 1: 1. You may make it control.

  Hereinafter, specific examples of the present invention will be described. The present invention is not limited to any of the following examples.

(Example)
In the embodiment, a reaction tower having a concentrate burner at the top and four air blowing nozzles mounted near the center of the side wall, a settler provided with one end connected to the lower part of the reaction tower, The operation was carried out using a self-melting smelting furnace equipped with a flue duct connected to the end.

  The ratio of the amount of reaction gas blown from the concentrate burner and the amount of reaction gas blown from the blow nozzle is blown from the reaction gas supply unit using the control device according to the amount of heat dissipated from the reaction tower. It controlled by changing the supply amount of the gas amount for reaction supplied to a pipe | tube and a ventilation nozzle.

  Specifically, when the amount of heat dissipated from the reaction tower becomes smaller than a predetermined threshold, the total amount of the reaction gas blown from the concentrate burner and the reaction gas blown from the blow nozzle is constant. The ratio of the amount of reaction gas blown from the blowing nozzle to the amount of reaction gas blown from the concentrate burner was set to 1: 1.

  In addition, when the amount of heat dissipated from the reaction tower exceeds a predetermined threshold, the total amount of the reaction gas blown from the concentrate burner and the reaction gas blown from the blow nozzle is kept constant. The ratio between the amount of reaction gas blown from the concentrate burner and the amount of reaction gas blown from the blowing nozzle was set to 2: 1.

Regarding the reaction gas amount, when the ratio of the reaction gas amount blown from the concentrate burner and the reaction gas amount blown from the blow nozzle is 2: 1, the reaction gas amount from the concentrate burner Was 20000 Nm ³ / h, and the amount of gas for reaction from the blowing nozzle was 10000 Nm ³ / h. Moreover, when the ratio of the amount of reaction gas blown from the concentrate burner and the amount of reaction gas blown from the blowing nozzle is 1: 1, the amount of reaction gas from the concentrate burner is set to 15000 Nm ³ / h. And the amount of gas for reaction from the blowing nozzle was 15000 Nm ³ / h.

  The operation of the auto smelting furnace was carried out for 11 days. The concentrate processing amount was 2500 t / day for the first day to the second day, 3000 t / day for the third day to the ninth day, and 3500 t / day for the tenth day to the eleventh day.

(Regarding the results of controlling the thickness of the coating layer)
FIG. 6 is a graph showing a change in heat dissipated in the auto-smelting furnace when the ratio between the amount of reaction gas blown from the concentrate burner and the amount of reaction gas blown from the blow nozzle is changed.

In the control device, on the 7th and 10th day when the amount of heat dissipated from the reaction tower becomes larger than a predetermined threshold (6000 Mcal / h) , the amount of reaction gas blown from the concentrate burner and the reaction blown from the blow nozzle The amount of reaction gas blown from the blowing nozzle was controlled to be smaller than the amount of reaction gas blown from the concentrate burner while keeping the total amount (30000 Nm 3 / h) with the amount of working gas constant. That is, the ratio of the amount of reaction gas blown from the concentrate burner and the amount of reaction gas blown from the blowing nozzle was controlled to be 1: 1 to 2: 1.

  Thus, it was confirmed that the amount of heat dissipated from the reaction tower was reduced by controlling the ratio of the amount of reaction gas blown from the blowing nozzle to 1: 1 to 2: 1. This is presumably because the amount of concentrate melt particles in the smelting raw material collided with the coating layer decreased and the coating layer grew.

In the control device, on the third and eighth days when the amount of heat dissipated from the reaction tower becomes smaller than a predetermined threshold (6000 Mcal / h) , the amount of reaction gas blown from the concentrate burner and the blower nozzle blown. The amount of reaction gas blown from the blowing nozzle and the amount of reaction gas blown from the concentrate burner were made the same while keeping the total amount (30000 Nm3 / h) of the reaction gas amount to be kept constant. That is, the ratio between the amount of reaction gas blown from the concentrate burner and the amount of reaction gas blown from the blowing nozzle was controlled to be 2: 1 to 1: 1.

  Thus, by controlling the ratio of the amount of reaction gas blown from the concentrate burner and the amount of reaction gas blown from the blowing nozzle to be 2: 1 to 1: 1, the emission from the reaction tower It was confirmed that the amount of heat increased. This is presumably because the amount of concentrate melt particles in the smelting raw material collides with the coating layer and the coating layer decreased.

  As described above, according to the present invention, it was confirmed that the coating layer formed on the inner side wall of the reaction tower can be controlled to an appropriate thickness.

1 Smelting furnace, 2 reaction tower, 3 settler, 4 slag, 5 slag hole, 6 mat, 7 mat hole, 8 flue, 10 concentrate burner, 11, 11 'reaction gas, 12 blower nozzle, 13 High-temperature exhaust gas, 14 Exhaust heat boiler, 15 Reaction gas supply unit, 16 Control device, 20 Concentration chute, 21 Blower pipe, 22 Burner cone, 23 Wind speed regulator, 24 Smelting raw material, 25 Auxiliary fuel burner, 26 Dispersion Corn, 30 smelting furnace, 31 firewood, 32 inlet, 40 mushrooms

Claims (4)

A self-smelting furnace having at least a reaction tower equipped with a concentrate burner provided at the top for supplying a smelting raw material together with fuel and a reaction gas and a blowing nozzle attached to a side wall for blowing the reaction gas is used. In the operation method of the auto smelting furnace,
Detecting the amount of heat dissipated from the side wall where the coating layer of the reaction tower is formed,
When the detected amount of heat dissipated exceeds a predetermined threshold, the total amount of the reaction gas blown from the concentrate burner and the reaction gas blown from the blow nozzle is kept constant, The amount of reaction gas blown from the blowing nozzle is less than the amount of reaction gas blown from the concentrate burner,
If the dissipation heat from the reactor is smaller than the predetermined threshold, while a constant total amount of the reaction gas quantity, and blown reaction gas quantity from air blowing nozzles, the purified mineral burner A method for operating a self-melting smelting furnace, characterized in that the amount of reaction gas blown from the same is made the same.   When the amount of heat dissipated from the reaction tower becomes larger than a predetermined threshold, the ratio of the reaction gas amount blown from the concentrate burner and the reaction gas amount blown from the blow nozzle is 2: 1. The method for operating a self-melting smelting furnace according to claim 1. In the auto smelting furnace having at least a reaction tower provided with a concentrate burner that is provided at the top and supplies a smelting raw material together with fuel and a reaction gas, and a blowing nozzle that is attached to a side wall and blows the reaction gas,
Detecting the amount of heat dissipated from the side wall where the coating layer of the reaction tower is formed,
When the detected amount of heat dissipated exceeds a predetermined threshold, the total amount of the reaction gas blown from the concentrate burner and the reaction gas blown from the blow nozzle is kept constant, The amount of reaction gas blown from the blowing nozzle is less than the amount of reaction gas blown from the concentrate burner,
If the dissipation heat from the reactor is smaller than the predetermined threshold, while a constant total amount of the reaction gas quantity, and blown reaction gas quantity from air blowing nozzles, the purified mineral burner A self-melting smelting furnace comprising a control device that controls the amount of reaction gas blown from the reactor to be the same. The control device
When the amount of heat dissipated from the reaction tower becomes larger than a predetermined threshold, the ratio of the amount of reaction gas blown from the concentrate burner and the amount of reaction gas blown from the blowing nozzle is 2: 1. 4. The auto-smelting furnace according to claim 3, wherein the smelting furnace is controlled so as to become.

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