Oxygen-enriched smelting furnace

Abstract

On the basis of an existing oxygen-enriched smelting furnace, a two-layer blast pipe with an air valve is further arranged from the middle of a lower water jacket to the outer side of the top of the lower water jacket to form a double-layer air hole, and the two-layer blast pipe is connected with an air bellow and used for introducing airflow regularly. The high-temperature area of the furnace body moves upwards at regular time through the introduction of airflow of the two layers of blast pipes, furnace knots are burnt out in time, the formation of the furnace knots is effectively reduced, the frequency of blowing out the furnace and ramming the furnace knots is reduced, the production continuity is improved, the productivity is increased, and the energy consumption is reduced.

Description

Technical Field

[0001] The utility model relates to the field of pyrometallurgy of non-ferrous metals, in particular to an oxygen-enriched smelting furnace. Background Art

[0002] The existing pyrometallurgical oxygen-enriched smelting furnace has a structure as Figure 1 shown: It includes a smoke outlet pipe 1, a feeding port 2, an upper water jacket 3, a lower water jacket 5 arranged in sequence from top to bottom, and a hearth 7 arranged at the bottom. In addition, a wind box 4 is also provided, and the wind box is connected to the bottom side of the lower water jacket 5 through a plurality of blast pipes 6. Figure 1 In the shown solution, the wind box 4 is arranged outside the upper water jacket 3 (there are also those arranged in other places). The wind box 4 and the blast pipes 6 introduce air flow into the bottom side of the lower water jacket 5 to form an upward air flow.

[0003] For the existing pyrometallurgical oxygen-enriched smelting furnace in use on the market, when smelting raw materials with a large amount of volatile substances (such as zinc and lead), furnace nodules are likely to be generated in the upper part of the smelting furnace body. After the generation of furnace nodules, it directly affects the feeding amount, resulting in a decrease in production capacity, and it is necessary to stop the furnace for treatment once every 3 days to deal with the furnace nodules. Summary of the Utility Model

[0004] The main technical problem to be solved by the utility model is to provide an oxygen-enriched smelting furnace that can effectively reduce furnace nodules.

[0005] To solve the above technical problem, the utility model provides an oxygen-enriched smelting furnace, which includes a hearth at the bottom, a smoke outlet pipe, a feeding port, an upper water jacket and a lower water jacket arranged in sequence from top to bottom above the hearth, and a wind box is also provided. The wind box guides the air flow to the bottom side of the lower water jacket through blast pipes. A two-layer blast pipe with a wind valve is also arranged at the outer side from the middle to the top of the lower water jacket, and the two-layer blast pipe is connected to the wind box for regularly introducing air flow.

[0006] During implementation, the number of the blast pipes is at least 8, and the number of the two-layer blast pipes is at least 4.

[0007] During implementation, both the blast pipes and the two-layer blast pipes are arranged in an equidistant and evenly distributed manner around the periphery of the lower water jacket.

[0008] During implementation, the number of the two-layer blast pipes is 1 / 2 to 3 / 4 of the number of the blast pipes.

[0009] During implementation, the number of the blast pipes changes according to the size of the furnace body. When the furnace body area is about 2 square meters, the number of the blast pipes is 12, and then for each 1 square meter increase in the furnace body area, the number of the blast pipes increases by 6.

[0010] During implementation, at least four wedge-shaped plates are longitudinally and spacedly arranged on the inner wall of the upper water jacket.

[0011] During implementation, the secondary blast air pipe includes an inclined pipe and a longitudinal pipe that communicate with each other; the inner end of the inclined pipe communicates with the side wall of the lower water jacket, the middle part communicates with the longitudinal pipe, and the outer end is provided with a glass surface as an observation port for the secondary blast air pipe; a blast air valve is arranged in the middle section of the longitudinal pipe, and the upper end is connected to the air box.

[0012] Preferably, from a horizontal perspective, the connection ports of all the blast air pipes with the outer wall of the lower water jacket are at the same horizontal height, and the connection ports of all the secondary blast air pipes with the outer wall of the lower water jacket are at the same horizontal height; from a longitudinal projection plane perspective, the blast air pipes and the secondary blast air pipes are arranged at intervals and offset.

[0013] During implementation, the blast air pipe may also include an inclined pipe and a longitudinal pipe that communicate with each other; the inner end of the inclined pipe communicates with the side wall of the lower water jacket, the middle part communicates with the longitudinal pipe, and the outer end is provided with a glass surface as an observation port for the blast air pipe; a second blast air valve is arranged in the middle section of the longitudinal pipe, and the upper end is connected to the air box.

[0014] The beneficial effect of the present utility model is as follows: An oxygen-enriched smelting furnace, on the basis of the existing oxygen-enriched smelting furnace, a secondary blast air pipe with a blast air valve is further arranged at the outer side from the middle to the top of the lower water jacket, forming a double-layer air eye. The secondary blast air pipe is connected to the air box for regularly introducing air flow. By introducing the air flow of the secondary blast air pipe, the high-temperature area of the furnace body is timely moved upward, the furnace slag is burned off in time, the formation of furnace slag is effectively reduced, the number of times of stopping the furnace to remove the furnace slag is reduced, the continuity of production is improved, the production capacity is increased, and the energy consumption is reduced. Description of the Drawings

[0015] In order to more clearly illustrate the technical solutions of the present application, the drawings required for implementation will be briefly introduced below. Obviously, the drawings in the following description are only some implementations of the present application. For those of ordinary skill in the art, other drawings can be obtained from these drawings without creative efforts.

[0016] Figure 1 It is a schematic structural diagram of an existing oxygen-enriched smelting furnace;

[0017] Figure 2 It is a schematic structural diagram of an embodiment of the present utility model;

[0018] Figure 3 It is Figure 2 a partial enlarged view of the blast air pipe and the secondary blast air pipe part of

[0019] Figure 4 It is Figure 2 the A-A cross-sectional view in

[0020] Figure 5 for Figure 2 BB section view in;

[0021] Figure 6 for Figure 2 CC section view in. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0023] The present invention is an oxygen-enriched smelting furnace, referring to Figure 1-2 As shown, it includes a furnace 7 at the bottom, a smoke outlet pipe 1, a charging port 2, an upper water jacket 3 and a lower water jacket 5 arranged above the furnace 7 and arranged in sequence from top to bottom, and a bellows 4 is also provided. The bellows 4 guides the airflow to the bottom side of the lower water jacket 5 through a blast pipe 6. The patent is characterized in that, Figure 2-6 As shown, a second-layer blast pipe 9 with an air valve 901 is also provided from the middle to the outer side of the top of the lower water jacket 5, and the second-layer blast pipe is connected to the bellows 4 for regularly introducing airflow. Figure 1 Based on the existing oxygen-enriched smelting furnace structure, an air eye is added in the middle of the furnace body (formed by setting a two-layer blast pipe 9), and the high-temperature area of ​​the furnace body is moved upward regularly (by opening the air valve 901 of the two-layer blast pipe 9 to introduce air flow), and the furnace knot is burned off in time, effectively reducing the formation of furnace knots and the number of furnace shutdowns to remove furnace knots. The continuity of production is improved, the production capacity is increased, and the energy consumption is reduced.

[0024] Reference Figure 2 Figure 6 As shown, at least four wedge-shaped plates 8 are longitudinally spaced apart on the inner wall of the upper water jacket 3. The wedge-shaped plates 8 play a role in guiding the airflow and can reduce furnace stagnation, and after opening the air valve 901 of the second-layer blast pipe 9, the effect of removing furnace stagnation can be improved.

[0025] When implementing, refer to Figure 2 Figure 6As shown, the number of the blast air pipes 6 is at least 8, and the number of the second-layer blast air pipes 9 is at least 4. Usually, during the production of the oxygen-enriched smelting furnace, the number of the blast air pipes 6 is fixed. After the trial operation, the second-layer blast air pipes 9 are set according to the furnace build-up situation. Since the second-layer blast air pipes 9 are equipped with air valves 901 that can be switched or even adjusted in air volume, more second-layer blast air pipes 9 can be set, but they are opened less as needed (the air valves 901). The connection interfaces between the blast air pipes 6 and the second-layer blast air pipes 9 and the side wall of the lower water jacket 5 can be respectively called the first-layer and second-layer air holes.

[0026] During implementation, with reference to Figure 4 、 5 As shown, preferably, the blast air pipes 6 and the second-layer blast air pipes 9 are both arranged equidistantly and uniformly around the periphery of the lower water jacket 5. This can maximize the air supply effect.

[0027] During implementation, the overall principle is that the number of the second-layer blast air pipes 9 is 1 / 2 to 3 / 4 of the number of the blast air pipes 6.

[0028] During implementation, specifically with reference to Figure 4 、 5 As shown, the number of the blast air pipes 6 changes according to the size of the furnace body. When the furnace body area (the furnace body area refers to the cross-sectional area of the lower end face of the lower water jacket 5) is about 2 square meters, the number of the blast air pipes 6 is 12. After that, for each 1-square-meter increase in the furnace body area, the number of the blast air pipes 6 increases by 6. Refer to the following table:

[0029] The size of the oxygen-enriched smelting furnace and the number of the first-layer and second-layer air holes

[0030]

[0031] During implementation, with reference to Figure 2 、 3 As shown in 5, the second-layer blast air pipes 9 include an inclined pipe and a longitudinal pipe that are connected to each other; the inner end of the inclined pipe is connected to the side wall of the lower water jacket 5, the middle part is connected to the longitudinal pipe, and the outer end is provided with a glass surface as the observation port 902 of the second-layer blast air pipe; an air valve 901 is arranged in the middle section of the longitudinal pipe, and the upper end is connected to the air box 4. The setting of the observation port 902 facilitates observing the furnace interior and the furnace build-up situation during use, and the air valve 901 facilitates controlling the opening and closing of each second-layer blast air pipe 9, and timely burning off the furnace build-up by adjusting the high-temperature area of the furnace body upward regularly and appropriately as needed.

[0032] During implementation, from a horizontal perspective, the connection ports of all the blast pipes 6 to the outer wall of the lower water jacket 5 are at the same horizontal height, and the connection ports of all the second-layer blast pipes 9 to the outer wall of the lower water jacket 5 are at the same horizontal height. Preferably, from the longitudinal projection plane, the blast pipes 6 and the second-layer blast pipes 9 are arranged at intervals and offset. In this way, for the first-layer tuyeres and the second-layer tuyeres corresponding to the blast pipes 6 and the second-layer blast pipes 9, the introduced airflows are staggered from each other, which can more effectively ensure the removal of furnace clinker.

[0033] During implementation, referring to Figure 2 , 3 , as shown in Figure 4, the blast pipe 6 includes an inclined pipe and a longitudinal pipe that communicate with each other; the inner end of the inclined pipe communicates with the side wall of the lower water jacket 5, the middle part communicates with the longitudinal pipe, and the outer end is provided with a glass surface as the observation port 602 of the blast pipe; a second air valve 601 is arranged in the middle section of the longitudinal pipe, and the upper end is connected to the air box 4. The setting of the observation port 602 facilitates observing the furnace interior and furnace clinker conditions during use, and the second air valve 601 facilitates controlling the blast pipe 6.

[0034] As Figure 2 - Figure 6 shown in the embodiment, an oxygen-enriched smelting furnace includes a smoke outlet pipe 1, a charging port 2, an upper water jacket 3, a lower water jacket 5 arranged in sequence from top to bottom, and a hearth 7 arranged at the bottom. An air box 4 is also provided. In the illustrated scheme, the air box 4 is hung outside the upper water jacket 3 (during implementation, the air box 4 can also be arranged at other positions or independently arranged). The furnace body area is approximately 2 square meters. The air box 4 is connected to the outer bottom end of the lower water jacket 5 through 12 blast pipes 6, and the high-pressure air flow of the air box 4 is introduced into the bottom side of the lower water jacket 5 to form an upward air flow, increasing the combustion efficiency in the furnace. The air box 4 is also connected to the upper side part of the lower water jacket 5 through 8 second-layer blast pipes 9, and the high-pressure air flow of the air box 4 is introduced into the second-layer blast pipes 9 at regular intervals through the air valve 901 to move the high-temperature zone in the furnace upward. At least six wedge-shaped plates 8 are longitudinally arranged at intervals on the inner wall of the upper water jacket 3 to enhance the effect of removing furnace clinker. Based on the existing oxygen-enriched smelting furnace, a second-layer blast pipe with an air valve is also arranged at the middle to top outer side of the lower water jacket in this patent to form a double-layer tuyere. The second-layer blast pipe is connected to the air box to regularly introduce air flow. By introducing the air flow of the second-layer blast pipe, the high-temperature zone of the furnace body is moved upward regularly, the furnace clinker is burned off in time, the formation of furnace clinker is effectively reduced, the number of times of stopping the furnace to remove furnace clinker is reduced, the continuity of production is improved, the production capacity is increased, and the energy consumption is reduced.

[0035] Further illustrate the operation process of the second-layer tuyeres formed by the second-layer tuyere pipe 9: A wind valve 901 is installed on each tuyere pipe of the second-layer tuyeres, which can adjust the air volume of each tuyere. When the furnace is in operation, the second-layer tuyeres need to be opened slightly (by adjusting the wind valve 901) to ensure the temperature at the upper part of the furnace and effectively avoid the initial formation of furnace accretion. The formation of furnace accretion is related to temperature and furnace charge. Different temperatures and different furnace charges result in different amounts of furnace accretion. When it is found that the furnace accretion increases during furnace charging, it is necessary to increase the air volume of the second-layer tuyeres, raise the temperature at the upper part of the furnace body, and minimize the formation of furnace accretion. It is necessary to observe frequently and adjust diligently to finally achieve the ideal state of balance between furnace accretion and air volume. During the operation of the furnace, the upper tuyeres and the lower tuyeres also need to be frequently ventilated to ensure that the second-layer tuyeres are not blocked by furnace accretion, form a closed loop, cause the temperature at the upper part of the furnace body to decrease, and generate a large amount of furnace accretion. At the same time, the observation port of the second-layer tuyeres (the observation port 902 of the second-layer tuyere pipe) can also effectively observe the temperature at the upper part of the furnace body and the formation amount of furnace accretion.

[0036] The above content is a further detailed description of the present utility model in combination with specific implementation manners, and it cannot be determined that the specific implementation of the present utility model is only limited to these descriptions. For those of ordinary skill in the technical field to which the present utility model belongs, without departing from the concept of the present utility model, several simple deductions or substitutions can still be made, and all should be regarded as belonging to the protection scope of the present utility model.

Claims

1. An oxygen-enriched smelting furnace, comprising a hearth (7) located at the bottom, a smoke outlet pipe (1), a feeding port (2), an upper water jacket (3) and a lower water jacket (5) which are arranged above the hearth (7) in sequence from top to bottom, and a blower box (4) is further provided. The blower box (4) guides air flow to the bottom side of the lower water jacket (5) through an air duct (6); it is characterized in that: At the outer side from the middle to the top of the lower water jacket (5), a two-layer blast air pipe (9) with a blast valve (901) is further provided, and the two-layer blast air pipe is connected to the air box (4) for regularly introducing air flow.

2. The oxygen-enriched smelting furnace according to claim 1, characterized in that, The number of the blast air pipes (6) is at least 8, and the number of the two-layer blast air pipes (9) is at least 4.

3. The oxygen-enriched smelting furnace according to claim 2, wherein, Both the blast air pipes (6) and the two-layer blast air pipes (9) are arranged equidistantly and uniformly around the periphery of the lower water jacket (5).

4. The oxygen-enriched smelting furnace according to claim 2, characterized in that, The number of the two-layer blast air pipes (9) is 1 / 2 to 3 / 4 of the number of the blast air pipes (6).

5. The oxygen-enriched smelting furnace according to claim 4, characterized in that, The number of the blast air pipes (6) changes according to the size of the furnace body. When the area of the furnace body is about 2 square meters, the number of the blast air pipes (6) is 12, and then for each 1-square-meter increase in the furnace body area, the number of the blast air pipes (6) increases by 6.

6. The oxygen-enriched smelting furnace according to any one of claims 1 to 5, characterized in that, On the inner wall of the upper water jacket (3), at least four wedge-shaped plates (8) are longitudinally arranged at intervals.

7. The oxygen-enriched smelting furnace according to any one of claims 1 to 5, characterized in that, The two-layer blast air pipe (9) includes an inclined pipe and a longitudinal pipe that are communicated with each other; the inner end of the inclined pipe is communicated with the side wall of the lower water jacket (5), the middle part is communicated with the longitudinal pipe, the outer end is provided with a glass surface as an observation port (902) of the two-layer blast air pipe; a blast valve (901) is arranged in the middle section of the longitudinal pipe, and the upper end is connected to the air box (4).

8. The oxygen-enriched smelting furnace according to any one of claims 2 to 5, characterized in that, Viewed from the horizontal angle, the connection ports of all the blast air pipes (6) and the outer wall of the lower water jacket (5) are at the same horizontal height, and the connection ports of all the two-layer blast air pipes (9) and the outer wall of the lower water jacket (5) are at the same horizontal height; viewed from the longitudinal projection plane, the blast air pipes (6) and the two-layer blast air pipes (9) are arranged at intervals and offset.

9. The oxygen-enriched smelting furnace according to any one of claims 1 to 5, characterized in that, The blast air pipe (6) includes an inclined pipe and a longitudinal pipe that are communicated with each other; the inner end of the inclined pipe is communicated with the side wall of the lower water jacket (5), the middle part is communicated with the longitudinal pipe, the outer end is provided with a glass surface as an observation port (602) of the blast air pipe; a second blast valve (601) is arranged in the middle section of the longitudinal pipe, and the upper end is connected to the air box (4).

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