Rotary refiner furnace

Abstract

The application relates to the technical field of metal smelting, in particular to a rotary refining furnace, which comprises a cylinder body, the cylinder body comprising a side wall and end covers arranged on both sides of the side wall; a rotating mechanism connected with the cylinder body, the rotating mechanism driving the cylinder body to rotate within a preset angle range; and a first combustion device comprising a first burner arranged on the side wall of the cylinder body. The rotary refining furnace can greatly improve the melting rate of materials, shorten the melting time, save energy consumption, greatly improve the uniformity of heating and prolong the service life of the furnace lining.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of metal smelting, in particular to a rotary refining furnace. BACKGROUND

[0002] The waste copper refining is a process of changing the solid copper-containing cold charge into qualified liquid refined copper through charging, melting, oxidizing, reducing and other processes, which is an indispensable link in copper pyrometallurgy. The main difference between the waste copper refining and the refining process of producing liquid blister copper from copper concentrates through smelting and converting is that the solid cold charge is added into the copper refining furnace, so it is necessary to first heat and melt the solid cold charge into liquid blister copper, and then carry out oxidizing and reducing refining. In this process, especially in the process of heating and melting the solid cold charge, more heat needs to be input than the refining process of directly adding high-temperature liquid blister copper, and the melting period is also longer, so improving the melting rate of waste copper and shortening the melting time become the main way to improve production efficiency and reduce energy consumption.

[0003] At present, the main furnace types used for waste copper refining include fixed reverberatory furnace, tilting reverberatory furnace and rotary refining furnace. Among them, the rotary refining furnace includes NGL furnace whose feed is all solid cold charge and rotary anode furnace whose feed is part solid cold charge and part liquid hot charge. Compared with fixed reverberatory furnace and tilting reverberatory furnace, the rotary refining furnace has gradually become one of the main furnace types for waste copper refining due to its many advantages.

[0004] The rotary refining furnace, especially the NGL furnace, needs to melt the solid cold copper into liquid blister copper in the shortest possible time because the feed is all solid cold charge, which requires a large amount of heat input. At present, the heat input is achieved by the heat released from the high-temperature flame generated by one or two combustion devices installed at the end cover part of the rotary refining furnace cylinder. The design capacity of the rotary refining furnace with solid cold charge feed is generally 200-300 tons, and there is a trend of further developing to large size, reaching 500-600 tons of charging capacity. However, due to the constraints of manufacturing level and transportation size, the ratio of the diameter to the length of the rotary refining furnace cannot be too large, and the only way to increase the charging capacity of the rotary refining furnace is to lengthen the furnace body. Since the combustion devices are currently installed at the end cover part of the cylinder of the refining furnace, the heat is concentrated on the side of the refining furnace close to the combustion device along the length direction, and the temperature is relatively high. SUMMARY

[0005] In order to solve or at least partially solve the above technical problems, the present application provides a rotary refining furnace, comprising:

[0006] a cylinder, the cylinder comprising a side wall and end covers arranged on both sides of the side wall;

[0007] a rotating mechanism connected with the cylinder, the rotating mechanism driving the cylinder to rotate within a preset angle range.

[0008] The first combustion device comprises a first burner, and the first burner is arranged on the side wall of the cylinder.

[0009] Optionally, the angle between the first burner and the central axis of the cylinder is 30° to 90°.

[0010] Optionally, the first combustion device further comprises a first fixed support tool, and the first burner is connected to the first fixed support tool.

[0011] Optionally, the first burner is fixed on the side wall.

[0012] The first combustion device further comprises a first metal hose, and the first metal hose is connected to the first fixed support tool and connected to the first burner.

[0013] Optionally, the first fixed support tool is arranged on the cylinder and moves with the cylinder.

[0014] Optionally, a first window is arranged on the side wall, and the first burner extends into the first window.

[0015] The first burner is fixedly arranged on the first fixed support tool and extends into the first window.

[0016] The first combustion device further comprises a first arc-shaped cover plate, and the first arc-shaped cover plate is arranged on the first burner and covers the first window during the rotation of the cylinder.

[0017] Optionally, a smoke exhaust port is arranged on the side wall, and the first combustion device further comprises a smoke extraction mechanism arranged opposite the first arc-shaped cover plate, and the smoke extraction mechanism is connected to the smoke exhaust port.

[0018] Optionally, a smoke exhaust port is arranged on the side wall, the smoke exhaust port is close to one of the two end covers, the first combustion device is close to the other of the two end covers, and the burner is inclined to the direction of the end cover close to the smoke exhaust port.

[0019] Optionally, the rotary refining furnace further comprises a second combustion device, and the second combustion device is arranged on the end cover away from the smoke exhaust port.

[0020] Optionally, the second combustion device comprises a second burner, and the angle between the second burner and the central axis of the cylinder is 0° to 45°.

[0021] Optionally, the rotary refining furnace further comprises a third combustion device, and the third combustion device is arranged at the middle part of the side wall.

[0022] The embodiments of the present application significantly improve the heating efficiency and the service life of the rotary refining furnace by arranging the first combustion device on the side wall of the cylinder. BRIEF DESCRIPTION OF DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the present application, the related drawings will be briefly introduced as follows. It can be understood that the drawings described below are only used to illustrate some embodiments of the present application, and those skilled in the art can also obtain many other technical features and connection relationships not mentioned in the present application according to the drawings.

[0024] Figure 1 is a top view schematic diagram of a typical rotary refining furnace in the prior art;

[0025] Figure 2 is a top view schematic diagram of another typical rotary refining furnace in the prior art;

[0026] Figure 3 is a top view schematic diagram of a rotary refining furnace provided by the embodiments of the present application when provided with a first metal hose and a first supporting tool;

[0027] Figure 4 is a side view schematic diagram of a rotary refining furnace provided by the embodiments of the present application when provided with only a first combustion device;

[0028] Figure 5 is a top view schematic diagram of a rotary refining furnace provided by the embodiments of the present application when provided with a first arc-shaped cover plate.

[0029] Figure 6 is a side view schematic diagram of a rotary refining furnace provided by the embodiments of the present application when provided with a first smoke extraction mechanism;

[0030] Figure 7 is a top view schematic diagram of a rotary refining furnace provided by the embodiments of the present application when provided with a first combustion device and a second combustion device;

[0031] Figure 8 is a side view schematic diagram of a rotary refining furnace provided by the embodiments of the present application when provided with a first combustion device and a second combustion device;

[0032] Figure 9 is a top view schematic diagram of a rotary refining furnace provided by the embodiments of the present application when provided with a first combustion device, a second combustion device and a third combustion device.

[0033] Explanation of reference signs:

[0034] 1, cylinder; 11, side wall; 12, end cover; 13, smoke outlet; 14, first window; 2, first combustion device; 21, first burner; 22, first supporting tool; 23, first metal hose; 24, first arc-shaped cover plate; 25, first smoke extraction mechanism; 26, second metal hose; 3, second combustion device; 4, third combustion device. Detailed Implementation

[0035] See Figure 1 In existing technology, rotary refining furnaces typically include: a cylindrical body 1, which includes side walls 11 and end caps 12 disposed on both sides of the side walls 11; a rotary mechanism (not shown) connected to the cylindrical body 1, which drives the cylindrical body 1 to rotate within a preset angle range; and a first combustion device 2 disposed on the end caps 12 of the cylindrical body 1. Typically, a flue gas outlet 13 is provided on the side wall 11 of the cylindrical body 1. The first combustion device 2 is disposed on the end cap 12 on the side away from the flue gas outlet 13.

[0036] Understandably, when this structure is applied to existing rotary refining furnaces, especially when the charge is a high-temperature liquid material that does not require much heat input, it can balance a simple structure, low cost and good thermal efficiency. Therefore, it has been widely used in existing rotary refining furnaces with hot charge.

[0037] In addition, to increase heat input, especially when the charge is entirely solid cold material, in the prior art, see [reference needed]. Figure 2 As shown, two first combustion devices 2 are also installed on the same end cover 12. These two first combustion devices 2 are installed at a certain angle and included angle, so that they work together to heat the material inside the cylinder.

[0038] However, the inventors of this application have discovered that as rotary refining furnaces are trending towards larger sizes, their loading capacity is gradually increasing, especially with the increase in the proportion of cold material being loaded, the shortcomings of the above-mentioned structure are becoming increasingly prominent.

[0039] Due to limitations in manufacturing capabilities and transportation dimensions, the diameter-to-length ratio of a rotary refining furnace cannot be too large. Therefore, when increasing the loading capacity, the furnace body is not enlarged proportionally, but rather primarily by increasing its length. Figure 1 and Figure 2 In the existing furnace structure shown, the first combustion device 2 is set on the end cover 12 on one side, which prevents the flame generated by combustion from quickly heating and melting the cold material pile located in the middle of the refining furnace or even on the other side. Therefore, the melting time of the cold material is significantly longer, and the longer melting cycle will obviously lead to higher energy consumption and lower production efficiency.

[0040] In view of this, this application provides a novel rotary refining furnace, which will be described in detail below with reference to the accompanying drawings.

[0041] First Embodiment

[0042] The first embodiment of the present application provides a rotary refining furnace, referring to Figure 3 , Figure 4 as shown, comprising: a cylinder 1, the cylinder 1 comprises a side wall 11 and end covers 12 arranged on both sides of the side wall 11; a rotary mechanism (not shown in the figure), connected with the cylinder 1, the rotary mechanism drives the cylinder 1 to rotate within a predetermined angle range; a first combustion device 2 arranged on the side wall 11 of the cylinder 1.

[0043] The cylinder 1 and the rotary mechanism used in the present application can be the conventional structure of the rotary refining furnace in the art. For example, the rotary mechanism can include several pairs of supporting wheels for the cylinder 1. By driving the supporting wheels to rotate through a power assembly such as a motor gear, the cylinder 1 can be driven to rotate. In the present application, the rotation of the cylinder 1 is reciprocating within a predetermined angle range, rather than continuous rotation for a full circle. Generally, the predetermined rotation angle is about 140° (-50° to 90°).

[0044] The first combustion device 2 of the present application uses oxygen or oxygen-enriched air as a combustion-supporting agent and mixes it with fuel to carry out combustion reaction and release heat. Specifically, the fuel used can be gaseous fuel (such as: natural gas, coal gas, liquefied petroleum gas, etc.), liquid fuel (such as: heavy oil, diesel oil, coal tar, coal water slurry, etc.) and solid fuel (such as: coal, petroleum coke, etc.); the combustion-supporting agent is oxygen or oxygen-enriched air, the oxygen concentration is 90% ~ 99.5% or higher (the rest is nitrogen and inert gas), and the oxygen concentration of oxygen-enriched air is 21% ~ 90% (the rest is nitrogen and inert gas). Since the combustion device uses oxygen (or oxygen-enriched air) instead of air as a combustion-supporting agent, it reduces the heat loss taken away by nitrogen and improves the thermal efficiency, greatly saving fuel consumption. Experiments have shown that fuel consumption can be reduced by 40 ~ 60%. The present application is particularly suitable for refining of cold materials such as scrap copper.

[0045] In addition, in the present application, the speed and direction of the gas flow sprayed by the first combustion device 2 will affect the flame combustion characteristics and temperature distribution, therefore, the speed of the gas flow sprayed can be in the range of 20 ~ 280 m / s. The gas flow spraying speed in this range is particularly suitable for cold material smelting of large-sized rotary refining furnaces.

[0046] In addition, it is worth mentioning that the first burner 21 can be as shown in Figure 4 The two independent and separate nozzles that can spray fuel and combustion-supporting agent respectively can also be two adjacent nozzles arranged in one gun body. The specific arrangement does not affect the realization of the technical purpose of the present application.

[0047] It can be understood that the first combustion device 2 can be arranged at the middle part of the side wall 11, or as shown in Figure 3The first combustion device 2 is arranged close to one of the end covers 12. Optionally, as shown in Figure 4 The first combustion device 2 comprises a first burner 21, and the angle between the first burner 21 and the central axis of the cylinder 1 is 30° to 90°. In Figure 4 The angle between the first burner 21 and the central axis of the cylinder 1 is about 45°.

[0048] Obviously, the closer the first burner 21 is to the middle of the side wall 11, the closer the first burner 21 is to the vertical direction relative to the central axis of the cylinder 1, and the more the first burner 21 can be directed to the center of the cylinder 1, thereby improving the uniformity of heating. Optionally, as shown in Figure 3 In order to consider the emission of flue gas, the side wall 11 can be further provided with a flue gas outlet 13 close to one of the end covers 12, and the first combustion device 2 is close to the other end cover 12, and the burner is obliquely directed to the direction of the end cover 12 close to the flue gas outlet 13.

[0049] In addition, optionally, as shown in Figure 3 The first combustion device 2 can further comprise a first support tool 22 fixedly arranged, and the first burner 21 is connected to the first support tool 22. Optionally, the first burner 21 is fixed to the side wall 11, and the first combustion device 2 further comprises a first metal hose 23 connected to the first support tool 22 and connected to the first burner 21.

[0050] By fixing the first burner 21 to the side wall 11, better sealing performance can be achieved. In addition, by means of the first metal hose 23 arranged, stable delivery of fuel and combustion-supporting agent can still be ensured during the rotation of the cylinder 1.

[0051] The first support tool 22 can be a bracket or a rotating flange structure. Further optionally, the first support tool 22 can be arranged on the cylinder 1 and move with the cylinder 1. By providing the first support tool 22, the first metal hose 23 can be provided with good structural support, making the system more stable. In addition, a second metal hose 26 connected to the first metal hose 23 at the first support tool 22 can be arranged, so as to connect the second metal hose 26 to a fuel source and / or a combustion-supporting agent source at a remote position.

[0052] Compared with the prior art, the installation position of the combustion device is changed, so that the first combustion device 2 is closer to the solid cold charge pile in the middle of the rotary refining furnace body, and therefore high-temperature combustion flame can be used to quickly and efficiently melt the solid cold charge, thereby greatly shortening the melting time and improving the production efficiency.

[0053] Second embodiment

[0054] The second embodiment of the present application provides a rotary refining furnace. The second embodiment is a further improvement of the first embodiment. The main improvement is that, in the second embodiment of the present application, as shown in Figure 5 a first window 14 is formed in the side wall 11 for the first burner 21 to extend into;

[0055] The first burner 21 is fixedly arranged on the first support tool 22 and extends into the first window 14. In this way, the first burner 21 does not need to be fixed on the side wall 11. Since the first burner 21 is not rigidly connected with the side wall 11, it is easier to overhaul and maintain the first burner 21.

[0056] Further, the first combustion device 2 further comprises a first arc-shaped cover plate 24 arranged on the first burner 21 and covering the first window 14 during the rotation of the cylinder 1. By arranging the first arc-shaped cover plate 24, the smoke can be prevented from escaping from the first window 14.

[0057] In the present embodiment, the first burner 21 does not need to swing with the rotation of the cylinder 1 due to the first window 14, so there is no need to arrange a metal hose. Moreover, since the burner itself is fixed, it will not swing with the rotation of the cylinder 1, which significantly prolongs the service life of the components of the first combustion device 2. More importantly, since the cylinder 1 is rotating and the first burner 21 is fixed, the injection area of the first burner 21 will be a large fan-shaped area rather than a small point-shaped area in the cylinder 1, which makes the heating of the first combustion device 2 more uniform, the heating efficiency better, and also prevents the premature aging of the refractory lining that may be caused by the concentration of the combustion area at one point.

[0058] In the present embodiment, the first support tool 22 can be fixedly arranged in the working space outside the cylinder, which serves to fix the first burner 21. Alternatively, as shown in Figure 6 when the side wall 11 is provided with a smoke outlet 13, the first combustion device 2 can further comprise a first smoke extraction mechanism 25 arranged opposite to the first arc-shaped cover plate 24, and the first smoke extraction mechanism 25 is connected to the smoke extraction channel corresponding to the smoke outlet 13.

[0059] As can be easily understood, since the first arc-shaped cover plate 24 is not connected with the cylinder body 1, a small amount of smoke may still escape from the joint. The first smoke extraction mechanism 25 is arranged to collect and discharge the smoke, thereby ensuring the environmental performance of the refining furnace. In addition, since the first smoke extraction mechanism 25 is connected with the smoke exhaust passage corresponding to the smoke exhaust port 13, an independent smoke exhaust passage need not be additionally arranged, thereby further reducing the cost and simplifying the structure.

[0060] Specifically, the first smoke extraction mechanism 25 can include various device components such as a fan and a pipeline for extracting smoke, which will not be described herein again.

[0061] Third Embodiment

[0062] The inventor of the present application further finds that, by arranging the first combustion device 2 on the side wall 11 of the cylinder body 1 according to the first embodiment, the melting efficiency can be significantly improved. However, for a large-sized rotary refining furnace, in order to increase the melting efficiency, the combustion power of the first combustion device 2 also needs to be increased, which may still cause uneven heating in the hearth and shorten the service life of the furnace lining.

[0063] The third embodiment of the present application provides a rotary refining furnace. The third embodiment is a further improvement of the first or second embodiment. The main improvement is that, in the third embodiment of the present application, as shown in Figure 7 、 Figure 8 The rotary refining furnace further includes a second combustion device 3 arranged on the end cover 12 away from the smoke exhaust port 13.

[0064] The second combustion device 3 can also be provided with a second burner, a second supporting tool, and other various metal hoses. In short, the structure of the second combustion device 3 can be consistent with or different from that of the first combustion device 2. The specific structure is not the focus of the present application, and thus will not be described herein again.

[0065] By arranging the second combustion device 3, the heating uniformity in the hearth can be improved under the joint action of the two combustion devices, thereby prolonging the service life of the furnace lining.

[0066] In the present embodiment, by changing the types and forms of the burners, the first combustion device 2 mounted on the side wall 11 of the cylinder body 1 can be designed to generate combustion flames with higher heating temperature and stronger radiation capacity, and the second combustion device mounted on the end cover 12 of the cylinder body 1 is designed to generate combustion flames that are more dispersed and more uniformly heated. That is, the combustion devices mounted at different positions can provide combustion flames with different characteristics according to the temperature requirement, thereby ensuring that the temperature distribution in the hearth is more uniform and reasonable.

[0067] And, when the second combustion device 3 comprises the second burner, the angle between the second burner and the central axis of the cylinder 1 is 0° to 45°. When the angle between the first burner 21 and the central axis of the cylinder 1 is 30° to 90°, the flames of the two can cooperate with each other, improving the heating efficiency. Therefore, by optimizing the installation position and angle of the burner, the heating speed and the heating uniformity of the rotary refining furnace are further improved, and the emission concentration of pollutants such as NOx is also greatly reduced.

[0068] In order to ensure the safety of combustion, automatic ignition and flame detection devices can be provided on each combustion device provided in the present application. At the same time, all media passing through the combustion device can pass through the flow control valve group and the program controller and PLC automatic control system to control the flow, pressure, safety interlocking and the like, and then enter the rotary refining furnace for mixed combustion, thereby realizing the "one-key" safe start and operation of the combustion device.

[0069] The embodiment of the present application also provides a process in actual use as follows:

[0070] 1. During the solid cold charge feeding and melting period, two combustion devices installed at the upper part of the rotary refining furnace cylinder 1 and the end cover 12 part of the cylinder 1 are used for heating at the same time, so as to rapidly melt the cold charge.

[0071] 2. During the refining, pouring and holding period after the material is melted, only the second combustion device 3 installed at the end cover 12 part of the cylinder 1 of the rotary refining furnace is used for heating or holding.

[0072] That is, the combustion devices installed at different positions can be flexibly started and stopped according to the process requirements of the rotary refining furnace. Therefore, the rotary refining furnace provided in the present application can greatly improve the melting rate of the material, shorten the melting time, save energy consumption, and greatly improve the heating uniformity and the service life of the furnace lining.

[0073] Fourth embodiment

[0074] The fourth embodiment of the present application provides a rotary refining furnace. The fourth embodiment is a further improvement of any one of the first, second or third embodiments. The main improvement is that, in the fourth embodiment of the present application, referring to Figure 9 the rotary refining furnace further comprises a third combustion device 4, and the third combustion device 4 is arranged at the middle part of the side wall 11.

[0075] By further increasing the number of combustion devices and adjusting the positions of the combustion devices, the melting efficiency and the heating uniformity can be further improved.

[0076] Finally, it should be noted that, for a person having ordinary skill in the art, many technical details can be understood in order to make the reader better understand the present application. However, even without these technical details and based on various changes and modifications of the above-mentioned embodiments, the technical solutions claimed in the claims of the present application can be substantially realized. Therefore, in practical applications, various changes can be made to the above-mentioned embodiments in form and details without departing from the spirit and scope of the present application.

Claims

1. A rotary refining furnace, characterized in that, include: A cylindrical body, the cylindrical body including side walls and end caps disposed on both sides of the side walls; A rotary mechanism is connected to the cylinder, and the rotary mechanism drives the cylinder to rotate within a preset angle range; The first combustion device includes a first burner, which is disposed on the side wall of the cylinder; A smoke exhaust port is provided on the side wall, the smoke exhaust port is close to one of the two end caps, the first combustion device is close to the other of the two end caps, and the burner is tilted toward the direction of the end cap close to the smoke exhaust port.

2. The rotary refining furnace according to claim 1, characterized in that, The angle between the central axis of the first burner and the cylinder is 30° to 90°.

3. The rotary refining furnace according to claim 2, characterized in that, The first combustion device further includes: a first support fixture fixedly disposed thereon; the first burner is connected to the first support fixture.

4. The rotary refining furnace according to claim 3, characterized in that, The first burner is fixed to the side wall; The first combustion device further includes: a first metal hose, which is connected to the first support fixture and connected to the first burner.

5. The rotary refining furnace according to claim 4, characterized in that, The first support fixture is mounted on the cylinder and moves with the cylinder.

6. The rotary refining furnace according to claim 3, characterized in that, A first window is provided on the side wall for the first burner to extend into; The first burner is fixedly mounted on the first support fixture and extends into the first window; The first combustion device further includes: a first arc-shaped cover plate, which is disposed on the first burner and covers the first window during the rotation of the cylinder.

7. The rotary refining furnace according to claim 1, characterized in that, The rotary refining furnace also includes a second combustion device, which is located on the end cover away from the flue gas outlet.

8. The rotary refining furnace according to claim 7, characterized in that, The second combustion device includes a second burner, the second burner forming an angle of 0° to 45° with the central axis of the cylinder.

9. The rotary refining furnace according to claim 1, characterized in that, The rotary refining furnace also includes a third combustion device, which is located in the middle of the side wall.

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