A smelting slag disposal device

Abstract

The application discloses a smelting slag disposal device, which comprises a first rotary kiln, a burner and a second rotary kiln. The burner is arranged at one end of the first rotary kiln in the axial direction and is configured to provide a flame to the first rotary kiln. The second rotary kiln is arranged at one end of the first rotary kiln away from the burner, and the second rotary kiln is in communication with the first rotary kiln. The second rotary kiln is configured to preheat the smelting slag, and the first rotary kiln is configured to dispose of the smelting slag preheated by the second rotary kiln. By arranging the second rotary kiln, the heat in the first rotary kiln is fully utilized, and the waste of heat is avoided. The smelting slag is preheated by the second rotary kiln before entering the first rotary kiln, the processing time in the first rotary kiln is shortened, the overall processing efficiency of the smelting slag is improved, the heating time of the burner is shortened, and the use cost is reduced.

Description

Technical Field

[0001] This application relates to the field of smelting waste slag treatment technology, and in particular to a smelting waste slag treatment device. Background Technology

[0002] In smelting production, smelting slag is generated, which is a type of industrial solid waste. With the development of production, solid waste is increasing year by year, and its treatment is an urgent problem to be solved. In existing technologies, solid waste is treated by incinerating it in rotary kilns, but the heat generated inside the rotary kiln is often wasted and not effectively utilized.

[0003] Therefore, improvements to existing technologies are necessary. Utility Model Content

[0004] This application aims to solve at least one of the technical problems existing in the prior art and to provide a smelting slag treatment device.

[0005] According to one aspect of this application, a smelting waste slag treatment apparatus is provided, including a first rotary kiln, a burner, and a second rotary kiln; the burner is disposed at one end of the first rotary kiln along its axial direction and is configured to provide a flame to the first rotary kiln; the second rotary kiln is disposed at one end of the first rotary kiln away from the burner, and the second rotary kiln is in communication with the first rotary kiln; the second rotary kiln is configured to preheat the smelting waste slag, and the first rotary kiln is configured to treat the smelting waste slag preheated by the second rotary kiln.

[0006] In one embodiment, the second rotary kiln is inclined along its axial direction, with two ends being a first end and a second end, the second end being close to the first rotary kiln, and the smelting slag being configured to enter the second rotary kiln from the first end; the height of the first end is higher than the height of the second end.

[0007] In one embodiment, the first rotary kiln has a first connecting portion at its end near the second rotary kiln, and the diameter of the first connecting portion gradually decreases in the direction from the first rotary kiln toward the second rotary kiln.

[0008] In one embodiment, along the axial direction of the second rotary kiln, a plurality of first feeding elements are spaced apart on the inner wall of the second rotary kiln.

[0009] In one embodiment, the first rotary kiln is divided into three processing sections along its axial direction, with the middle processing section having the highest operating temperature. Each processing section has a second material feeding component on its inner wall, with a projection plane λ perpendicular to the axial direction of the first rotary kiln. The orthographic projections of the second material feeding components in adjacent processing sections on the projection plane λ are intersected.

[0010] In one embodiment, the second feeding member has an angled mounting portion for feeding, the mounting portion being connected to the inner wall of the processing section, and the angle between the mounting portion and the feeding portion being α, satisfying: 75°≤α≤90°.

[0011] In one embodiment, the three processing sections are sequentially referred to as the first processing section, the second processing section, and the third processing section along the axial direction of the first rotary kiln. The operating temperature of the second processing section is greater than that of the third processing section, and the operating temperature of the third processing section is greater than that of the first processing section. The first processing section is located near the second rotary kiln, and an opening is provided on the peripheral wall of the first processing section. The opening is configured to allow smelting waste slag to enter or exit.

[0012] In one embodiment, the first rotary kiln is set at an angle to the horizontal plane η, the height of the third processing section is higher than the height of the first processing section, and the angle between the first rotary kiln and the horizontal plane η is β, which satisfies: 2°≤β≤5°.

[0013] In one embodiment, the first rotary kiln is further provided with an air inlet, and the sidewalls of each of the processing sections are provided with the air inlet; the air inlet and the opening in the first processing section are spaced apart circumferentially in the first processing section.

[0014] In one embodiment, the air intake is detachably connected to the processing section.

[0015] The beneficial effects of this application are as follows: the second rotary kiln is interconnected with the first rotary kiln. Hot gas from the first rotary kiln is transported to the second rotary kiln to preheat the smelting waste in the second rotary kiln. The preheated smelting waste is then transported back to the first rotary kiln for combustion treatment under the action of the burner and the first rotary kiln. The high-temperature gas generated by combustion in the first rotary kiln enters the second rotary kiln, and this process is repeated. By setting up the second rotary kiln, the heat in the first rotary kiln is fully utilized, avoiding heat waste. Furthermore, the smelting waste is preheated in the second rotary kiln before entering the first rotary kiln, which shortens the processing time in the first rotary kiln, improves the overall processing efficiency of the smelting waste, and also shortens the heating time of the burner, reducing operating costs. Attached Figure Description

[0016] The technical solution and other beneficial effects of this application will become apparent from the following detailed description of specific embodiments in conjunction with the accompanying drawings.

[0017] Figure 1 This is a schematic diagram of a smelting slag treatment device provided in an embodiment of this application.

[0018] Figure 2 This is a schematic diagram of a first rotary kiln provided in an embodiment of this application.

[0019] Figure 3 yes Figure 2 Side view.

[0020] Figure 4 yes Figure 3 Sectional view at point AA.

[0021] Figure 5 This is a schematic diagram of a second rotary kiln provided in an embodiment of this application.

[0022] Figure 6 yes Figure 5 Sectional view at point BB.

[0023] Figure 7 yes Figure 2 The left view.

[0024] Figure 8 This is a schematic diagram of a second feeder provided in an embodiment of this application.

[0025] Figure 9 This is a schematic diagram of another second batch of materials provided in an embodiment of this application.

[0026] In the picture:

[0027] 10. First rotary kiln; 11. Kiln body; 111. Processing section; 1111. First processing section; 1112. Second processing section; 1113. Third processing section; 12. Second feeding component; 121. Mounting part; 122. Feeding part; 13. Refractory brick; 14. Opening; 15. Air inlet; 16. First connecting part;

[0028] 20. First end;

[0029] 30. The second end;

[0030] 40. Driver components;

[0031] 50. Smelting slag;

[0032] 60. Second rotary kiln; 61. Second connecting part; 62. Second feeding component; 63. Discharge port. Detailed Implementation

[0033] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0034] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication between two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0035] The smelting slag treatment device of this application will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0036] In existing technologies, solid waste is incinerated using rotary kilns, but the heat generated inside the rotary kiln is often wasted and not effectively utilized.

[0037] To address the aforementioned technical problems, this application provides a smelting waste slag treatment device, including a first rotary kiln, a burner, and a second rotary kiln. The burner is located at one axial end of the first rotary kiln and configured to provide a flame to the first rotary kiln. The second rotary kiln is located at the end of the first rotary kiln away from the burner and is in communication with the first rotary kiln. The second rotary kiln is configured to preheat the smelting waste slag, and the first rotary kiln is configured to treat the smelting waste slag preheated by the second rotary kiln. This will be described in detail below.

[0038] See Figure 1-6 The smelting waste slag 50 treatment device includes a first rotary kiln 10, a burner, and a second rotary kiln 60; the burner is located at one end of the first rotary kiln 10 in the axial direction and is configured to provide flame to the first rotary kiln 10; the second rotary kiln 60 is located at one end of the first rotary kiln 10 away from the burner and is in communication with the first rotary kiln 10; the second rotary kiln 60 is configured to preheat the smelting waste slag 50, and the first rotary kiln 10 is configured to treat the smelting waste slag 50 preheated by the second rotary kiln 60.

[0039] The second rotary kiln 60 is interconnected with the first rotary kiln 10. Hot gas from the first rotary kiln 10 is transported to the second rotary kiln 60 to preheat the smelting waste slag 50 in the second rotary kiln 60. The preheated smelting waste slag 50 is then transported back to the first rotary kiln 10 for combustion under the action of the burner and the first rotary kiln 10. The high-temperature gas generated by the combustion in the first rotary kiln 10 enters the second rotary kiln 60, and this process is repeated. By setting up the second rotary kiln 60, the heat in the first rotary kiln 10 is fully utilized, avoiding heat waste. Furthermore, the preheating treatment of the smelting waste slag 50 in the second rotary kiln 60 before entering the first rotary kiln 10 shortens the processing time in the first rotary kiln 10, improves the overall processing efficiency of the smelting waste slag 50, and also shortens the heating time of the burner, reducing operating costs.

[0040] In the actual processing, the smelting waste 50 to be processed is fed into the second rotary kiln 60 through a conveying device. The smelting waste 50 is preheated by the hot air provided by the first rotary kiln 10. After preheating, the preheated smelting waste 50 is lifted into the hopper (for feeding into the first rotary kiln 10) by an elevator. It is then fed into the first rotary kiln 10 for combustion.

[0041] It is worth mentioning that both the first rotary kiln 10 and the second rotary kiln 60 can rotate. During the rotation, they can drive the internal smelting waste slag 50, which is conducive to the full preheating (in the second rotary kiln 60) and full combustion (in the first rotary kiln 10) of the smelting waste slag 50. This improves the combustion efficiency and heating efficiency of the smelting waste slag 50, while shortening the smelting time of the smelting waste slag 50 and reducing the smelting cost.

[0042] In some embodiments, the second rotary kiln 60 is inclined, and along the axial direction of the second rotary kiln 60, the two ends of the second rotary kiln 60 are a first end 20 and a second end 30, the second end 30 being close to the first rotary kiln 10, and the smelting slag 50 being configured to enter the second rotary kiln 60 from the first end 20; the height of the first end 20 is higher than the height of the second end 30.

[0043] In this embodiment, the second rotary kiln 60 is inclined. During the rotation of the second rotary kiln 60, the smelting waste slag 50 is gradually conveyed from the first end 20 to the second end 30. The second end 30 is close to the first rotary kiln 10, meaning that the temperature of the second end 30 is higher than that of the first end 20. After the smelting waste slag 50 enters the second rotary kiln 60 from the first end 20, during the conveying process (from the first end 20 to the second end 30), the temperature of the smelting waste slag 50 gradually increases, making the preheating path of the smelting waste slag 50 longer (that is, the axial length of the second rotary kiln 60), which can fully preheat the smelting waste slag 50.

[0044] It should be noted that the second rotary kiln 60 is set at an angle, that is, the second rotary kiln 60 is set at an angle relative to the horizontal plane η, and the smelting waste slag 50 can be conveyed from the first end 20 to the second end 30 under its own weight.

[0045] It is worth mentioning that in some embodiments, the second rotary kiln 60 is provided with a discharge port 63 at the second end 30. The smelting waste slag 50 after preheating can be discharged through the discharge port 63. The discharge port 63 is located at the second end 30, which is conducive to the discharge of the smelting waste slag 50 from the second rotary kiln 60.

[0046] In some embodiments, the first rotary kiln 10 has a first connecting portion 16 at the end near the second rotary kiln 60, and the diameter of the first connecting portion 16 gradually decreases in the direction from the first rotary kiln 10 toward the second rotary kiln 60.

[0047] In this embodiment, the hot gas in the first rotary kiln 10 enters the second rotary kiln 60 after passing through the first connecting part 16. Since the diameter of the first connecting part 16 gradually decreases in the direction away from the first rotary kiln 10, the gas velocity increases after passing through the first connecting part 16, and it can flow to a farther place. This is beneficial for the hot gas entering the second rotary kiln 60 to fill the entire second rotary kiln 60 (along the axial direction of the second rotary kiln 60), which is beneficial for the full preheating of the smelting waste slag 50 in the second rotary kiln 60.

[0048] In some embodiments, the second rotary kiln 60 has a second connecting portion 61 at the end near the first rotary kiln 10, and the diameter of the second connecting portion 61 gradually decreases in the direction from the second rotary kiln 60 toward the first rotary kiln 10; this facilitates the connection between the first rotary kiln 10 and the second rotary kiln 60.

[0049] In some embodiments, a plurality of first feeding members 62 are provided at intervals along the axial direction of the second rotary kiln 60.

[0050] By setting the first feeding component 62, during the rotation of the second rotary kiln 60, the smelting waste slag 50 at the bottom of the second rotary kiln 60 is transferred to the top of the second rotary kiln 60. Under the action of gravity, the smelting waste slag 50 gradually falls back to the bottom of the second rotary kiln 60, avoiding the accumulation of smelting waste slag 50 at the bottom of the second rotary kiln 60 and improving the preheating effect of smelting waste slag 50.

[0051] In some embodiments, in order to ensure sufficient preheating and combustion of the smelting waste slag 50, the smelting waste slag 50 can be made into several spherical or elliptical material units with gaps between adjacent material units, which is beneficial to improving preheating efficiency and combustion efficiency.

[0052] See Figure 7In some embodiments, the first rotary kiln 10 is divided into three processing sections 111 in sequence along the axial direction of the first rotary kiln 10, with the middle processing section 111 having the highest working temperature; each processing section 111 has a second feeding element 12 on its inner wall, and a projection plane λ perpendicular to the axial direction of the first rotary kiln 10 is set, with the orthographic projections of the second feeding elements 12 of adjacent processing sections 111 intersecting each other on the projection plane λ.

[0053] The slag 50 contains complex materials with different reaction temperatures. When the furnace is at the same temperature, multiple materials are processed simultaneously, which can cause interference and affect the final processing effect. This application divides the first rotary kiln 10 (kiln body 11) into multiple processing sections 111 with different working temperatures along the axial direction. This allows for the segmented processing of various materials in the slag 50 (different materials are processed at different working temperatures), which is beneficial for improving the processing quality of materials in the furnace and shortening the smelting time.

[0054] For ease of explanation, the three processing sections 111 along the axial direction of the first rotary kiln 10 are, in sequence, the first processing section 1111, the second processing section 1112, and the third processing section 1113. The second processing section 1112 has the highest operating temperature (higher than the operating temperatures in the first and third processing sections 1111 and 1113). The second processing section 1112 is located in the middle, and the processing sections 111 on either side (the first and third processing sections 1111 and 1113) provide some insulation for it, ensuring that the operating temperature in the second processing section 1112 remains at a relatively high set temperature, avoiding… To prevent external factors from affecting the working temperature of the second processing section 1112 and causing it to decrease; when the working temperature in the third processing section 1113 is the highest, the temperature difference between the side of the third processing section 1113 away from the second processing section 1112 (external space) and the temperature inside the third processing section 1113 is too large, which can easily cause heat loss in the third processing section 1113, lowering the temperature and making it difficult to maintain the high temperature inside the third processing section 1113; therefore, the highest working temperature in the second processing section 1112 is conducive to temperature maintenance, improving the processing quality of materials in the furnace, and shortening the smelting time.

[0055] In this embodiment, each processing section 111 is provided with a second material feeding component 12. During the rotation of the first rotary kiln 10 (each processing section 111), the second material feeding component 12 transfers the smelting waste slag 50 at the bottom of the first rotary kiln 10 to the top of the first rotary kiln 10. Under the action of gravity, the smelting waste slag 50 gradually falls back to the bottom of the first rotary kiln 10. During the process of the smelting waste slag 50 falling from the top to the bottom, the smelting waste slag 50 comes into full contact with the flame, and the smelting waste slag 50 is fully burned, which improves the combustion efficiency and heating efficiency of the smelting waste slag 50, and at the same time shortens the smelting time of the smelting waste slag 50 and reduces the smelting cost.

[0056] It is worth mentioning that, due to the rotation of the first rotary kiln 10, the smelting waste 50 will be subjected to centrifugal force. As the smelting waste 50 falls from the top to the bottom of the first rotary kiln 10, impurities will be more easily separated, which improves the efficiency of impurity separation and helps to improve the purity of the material obtained after smelting.

[0057] Additionally, when the smelting slag 50 in one processing section 111 is falling from the top to the bottom of the first rotary kiln 10, the second feeders 12 in adjacent processing sections 111 are staggered (e.g., Figure 7 As shown in the figure, the second feeder 12a and the second feeder 12b are interleaved, so that the smelting waste 50 in the adjacent processing section 111 is not in the falling process, that is, the smelting waste 50 in the adjacent processing section 111 will not affect each other, which is beneficial to improving the purity of the material obtained after smelting.

[0058] In some embodiments, the inner wall of the first rotary kiln 10 is provided with refractory bricks 13, and the second feeding component 12 is embedded in the refractory bricks 13. The refractory bricks 13 can protect the first rotary kiln 10 and improve its service life. At the same time, since the second feeding component 12 is provided on the inner wall of the first rotary kiln 10 (processing section 111) and is embedded in the refractory bricks 13, the refractory bricks 13 can cover the connection between the second feeding component 12 and the first rotary kiln 10, preventing the connection between the second feeding component 12 and the first rotary kiln 10 from directly contacting the flame, thus improving the stability of the second feeding component 12 installed on the first rotary kiln 10.

[0059] In some embodiments, the second rotary kiln 60 is similarly configured, which will not be described in detail here.

[0060] See Figure 8 and Figure 9 The second feeding component 12 has an angled mounting part 121 and a feeding part 122. The mounting part 121 is connected to the inner wall of the processing section 111. The angle between the mounting part 121 and the feeding part 122 is α, which satisfies: 75°≤α≤90°, such as 75°, 78°, 81°, 84°, 87°, 90°, etc.

[0061] By connecting the mounting part 121 to the inner wall of the processing section 111, the contact area between the second feeding component 12 and the inner wall of the processing section 111 is increased, which helps to improve the stability of the installation of the second feeding component 12 on the inner wall of the processing section 111.

[0062] When the value of α is less than 75°, the distance between the feeding part 122 and the mounting part 121 (inner wall of the processing section 111) is relatively close, that is, the end of the feeding part 122 away from the mounting part 121 is close to the inner wall of the processing section 111. During the process of the feeding part 122 rotating with the first rotary kiln 10, the feeding effect is poor, and the smelting waste slag 50 moved by the feeding part 122 is easily placed on the left side (e.g., Figure 8 As shown, the smelting waste 50 is piled up to the left, meaning that the smelting waste 50 does not pass through the center of the first rotary kiln 10 during its fall, and the smelting waste 50 cannot make good contact with the flame. If it is necessary to move the smelting waste 50 to the middle of the processing section 111, the feeding section 122 needs to be extended, which increases the material usage cost, and the extended feeding section 122 has poor rigidity.

[0063] When the value of α is greater than 90°, the feeding section 122 needs to bring the smelting waste slag 50 to a very high position before it can fall back down, which easily causes the smelting waste slag 50 to accumulate to the right (e.g., Figure 9 As shown, the smelting waste slag 50 is far from the center of the first rotary kiln 10 (the center position allows the smelting waste slag 50 to fully contact the flame), which is not conducive to the full combustion of the smelting waste slag 50. Moreover, the smelting waste slag 50 is brought to a higher position, and the first rotary kiln 10 needs to overcome the greater gravitational potential energy brought by the smelting waste slag 50, which requires a stronger driving force to drive the first rotary kiln 10 to rotate, which is not conducive to reducing production costs.

[0064] Therefore, when the value of α is 75°≤α≤90°, it can ensure that the smelting waste slag 50 is in full contact with the flame during the process of falling back down after being moved (the falling smelting waste slag 50 passes through the center position of the first rotary kiln 10), thereby improving the combustion efficiency and heating efficiency of the smelting waste slag 50. It can also reduce the use of materials, ensure the rigidity of the feeding part 122, and help improve the service life of the second feeding part 12.

[0065] It should be noted that the second batch of material 12 can be a one-piece part made by bending or a one-piece part made by welding two steel plates; no specific limitation is made here.

[0066] In some embodiments, the three processing sections 111 are sequentially referred to as the first processing section 1111, the second processing section 1112, and the third processing section 1113 along the axial direction of the first rotary kiln 10. The working temperature of the second processing section 1112 is higher than that of the third processing section 1113, and the working temperature of the third processing section 1113 is higher than that of the first processing section 1111. The first processing section 1111 is close to the second rotary kiln 60, and the peripheral wall of the first processing section 1111 is provided with an opening 14, which is configured to allow the smelting waste slag 50 to enter and exit.

[0067] The first processing section 1111 has the lowest operating temperature. In the actual smelting process, the smelting waste slag 50 is first put into the first processing section 1111 with a lower operating temperature. The components that can be processed at this temperature are processed first. At the same time, the remaining smelting waste slag 50 is preheated. Then, the preheated smelting waste slag 50 is transported to the second processing section 1112 with the highest temperature for further processing. This is beneficial to improving the processing quality of the smelting waste slag 50 in the furnace. The preheating effect of the first processing section 1111 with a lower operating temperature on the smelting waste slag 50 can also reduce smelting time and smelting costs.

[0068] It is worth mentioning that in the actual smelting process, some smelting waste slag 50 will enter the third processing section 1113 from the second processing section 1112. The smelting waste slag 50 is processed at the working temperature of the third processing section 1113. The smelting waste slag 50 can be placed in different processing sections 111 for processing, which is beneficial to improving the processing quality of materials in the furnace.

[0069] See Figure 3 In some embodiments, the first rotary kiln 10 is set at an angle to the horizontal plane η, the height of the third processing section 1113 is higher than the height of the first processing section 1111, and the angle between the first rotary kiln 10 and the horizontal plane η is β, which satisfies: 2°≤β≤5°, such as 2°, 3°, 4°, 5°, etc.

[0070] The opening 14 is located on the peripheral wall of the first processing section 1111. The height of the first processing section 1111 is lower than the height of the third processing section 1113. That is, the first rotary kiln 10 is set at an inclination. After the smelting process is completed, the inclination of the first rotary kiln 10 facilitates the discharge of residue from the opening 14, thereby improving the smelting efficiency.

[0071] When β is less than 2°, the inclination of the first rotary kiln 10 is small, resulting in a smaller guiding effect on the material (residue). When β is greater than 5°, the inclination of the first rotary kiln 10 is large. During the smelting of smelting waste slag 50, for example, when the smelting waste slag 50 is burned in the second processing section 1112 (which needs to be processed at the working temperature of the second processing section 1112), the smelting waste slag 50 is easily transported to the first processing section 1111 under the action of gravity due to the large inclination of the first rotary kiln 10 as it rotates. However, the working temperature of the first processing section 1111 is lower than that of the second processing section 1112, which affects the smelting treatment of the smelting waste slag 50. In other words, the large inclination of the first rotary kiln 10 is not conducive to the full treatment of the smelting waste slag 50 and affects the treatment quality of the smelting waste slag 50 in the furnace.

[0072] In some embodiments, the first rotary kiln 10 is further provided with an air inlet 15, and each processing section 111 has an air inlet 15 on its sidewall; the air inlet 15 and the opening 14 provided in the first processing section 1111 are circumferentially spaced apart.

[0073] The air inlet 15 and the opening 14 on the first processing section 1111 are spaced apart. In this embodiment, the central angle of the part of the side wall of the first processing section 1111 located between the two (air inlet 15 and opening 14) is 90° (in some embodiments, other angles may be set, depending on the diameter of the first rotary kiln 10, etc.). When air needs to be introduced, the first rotary kiln 10 is rotated until the air inlet 15 is above the first rotary kiln 10. At this time, the opening 14 faces the side of the first rotary kiln 10 and can be used as an observation window to facilitate personnel to detect and observe the reaction of the internal smelting slag 50 in real time.

[0074] It should be noted that in some embodiments, hydrogen is supplied to the interior of the first rotary kiln 10 through the air inlet 15. The strong reducing properties of hydrogen at high temperatures are used to reduce metal ions or other ions into pure metals to form an alloy. Specifically, under high-temperature conditions, hydrogen reacts with metal oxides or other compounds to generate the desired elemental metal, as well as compounds such as silicon carbide, silicon dioxide, and sodium silicate. In some embodiments, other gases may also be supplied, depending on the reaction inside the furnace.

[0075] It is worth mentioning that when gas needs to be introduced into the furnace, the gas inlet 15 is rotated to the top of the first rotary kiln 10, that is, the gas inlet pipe is laid above the first rotary kiln 10, which will not interfere with the arrangement and installation of other components of the first rotary kiln 10. Moreover, being located above, even if there is a hydrogen leak during hydrogen addition (introducing hydrogen into the first rotary kiln 10), it will still occur above the first rotary kiln 10, which is beneficial to improving the safety of use.

[0076] It should be noted that the safe use of the first rotary kiln 10 is of paramount importance. In some embodiments, safety components can be used to prevent risks such as hydrogen leakage and explosion. For example, a hydrogen leakage detection system can be set up, which includes a concentration sensor, an alarm device, and a shut-off device. The concentration sensor can monitor the hydrogen concentration in the environment in real time, usually with a ppm threshold (parts per million, indicating how many parts of a mixture of one million parts are substances of concern). When the concentration exceeds the limit, an audible and visual alarm is triggered (the alarm device is triggered), and it can be linked with the shut-off device to achieve an emergency shutdown, cutting off the gas source within 0.5 to 2 seconds.

[0077] In some embodiments, the safety components also include a backfire prevention device and a flame suppression system. The backfire prevention device can prevent flames from entering the hydrogen pipeline in reverse and causing an explosion, such as a metal sintered flame arrester or a corrugated plate flame arrester. The flame suppression system includes a flame detector (which detects open flames via infrared or ultraviolet sensors) and a fire extinguishing device. The fire extinguishing device can automatically spray water mist or activate a carbon dioxide fire extinguisher to extinguish open flames, effectively improving the safety of the first rotary kiln 10.

[0078] Meanwhile, a pressure relief valve, a rupture disc, and a grounding device can be installed in the first rotary kiln 10. The pressure relief valve and the rupture disc are linked with the aforementioned pressure sensor. When overpressure occurs, the pressure relief valve automatically releases hydrogen gas to protect the equipment. Under some extreme pressure conditions, the rupture disc can achieve one-time pressure relief to protect the equipment. The grounding device can eliminate static electricity and prevent the generation of sparks, thus improving the safety of the first rotary kiln 10. At the same time, explosion-proof electrical equipment that conforms to IEC standards (international electrotechnical standards formulated by the International Electrotechnical Commission) such as explosion-proof motors and junction boxes can be used to prevent internal sparks from coming into contact with external gas (hydrogen), thereby improving the overall safety of use.

[0079] In some embodiments, the safety components also include a gas purging system that replaces hydrogen in the pipeline with an inert gas (e.g., nitrogen) before the equipment is started or after it is shut down, to prevent the formation of an explosive mixture.

[0080] It is worth mentioning that, in order to ensure the safe use of the first rotary kiln 10, the external environment of the first rotary kiln 10 can also be arranged, such as setting up a ventilation system to ensure air circulation in the equipment room and reduce the risk of hydrogen accumulation, and setting up explosion vents on the roof of the equipment room (factory building) to release pressure in a directional manner during an explosion and reduce the damage caused by the explosion.

[0081] Explosion-proof walls and other isolation structures can be installed around the first rotary kiln 10 to limit the range of the explosion's impact. Conspicuous markings should be added to the hydrogen pipeline to indicate the direction of hydrogen flow. At the same time, personnel operation training should be provided, emergency procedures should be standardized, and regular maintenance should be carried out.

[0082] In some embodiments, the air intake 15 is detachably connected to the processing section 111.

[0083] The air intake component 15 is detachable, and different air intake components 15 can be replaced according to different smelting waste slag 50, such as replacing the air intake component 15 with different air intake volumes, which can be flexibly adapted to actual production; at the same time, it is convenient for the later maintenance and repair of the air intake component 15 and is easy to use.

[0084] Using the technical solution provided in this application embodiment, the second rotary kiln 60 is interconnected with the first rotary kiln 10. Hot gas in the first rotary kiln 10 is transported to the second rotary kiln 60 to preheat the smelting waste slag 50 in the second rotary kiln 60. The preheated smelting waste slag 50 is then transported back to the first rotary kiln 10 for combustion under the action of the burner and the first rotary kiln 10. The high-temperature gas generated by the combustion in the first rotary kiln 10 enters the second rotary kiln 60, and this process is repeated. By setting up the second rotary kiln 60, the heat in the first rotary kiln 10 is fully utilized, avoiding heat waste. Furthermore, the smelting waste slag 50 is preheated in the second rotary kiln 60 before entering the first rotary kiln 10, which shortens the processing time in the first rotary kiln 10, improves the overall processing efficiency of the smelting waste slag 50, and also shortens the heating time of the burner, reducing operating costs.

[0085] In the various embodiments of this application, unless otherwise specified or logically conflicting, the terminology or descriptions between different embodiments are consistent and can be referenced mutually. Technical features in different embodiments can be combined to form new embodiments based on their inherent logical relationships. In this application, "at least one" means one or more, and "more than one" means two or more.

[0086] It is understood that the various numerical designations used in the embodiments of this application are merely for descriptive convenience and are not intended to limit the scope of the embodiments of this application. The order of the process numbers described above does not imply the order of execution; the execution order of each process should be determined by its function and internal logic.

[0087] The above provides a detailed description of the smelting slag treatment device provided in the embodiments of this application. Specific examples have been used to illustrate the principles and implementation methods of this application. The description of the above embodiments is only for the purpose of helping to understand this application and its core ideas. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of this application. Therefore, the content of this specification should not be construed as a limitation of this application.

Claims

1. A smelting slag treatment device, characterized in that, include First rotary kiln; A burner is disposed at one end of the first rotary kiln along the axial direction and is configured to supply flame to the first rotary kiln; as well as The second rotary kiln is located at the end of the first rotary kiln away from the burner, and the second rotary kiln is in communication with the first rotary kiln; the second rotary kiln is configured to preheat the smelting waste slag, and the first rotary kiln is configured to process the smelting waste slag preheated by the second rotary kiln.

2. The smelting waste slag treatment device as described in claim 1, characterized in that, The second rotary kiln is inclined. Along the axial direction of the second rotary kiln, the two ends of the second rotary kiln are the first end and the second end. The second end is close to the first rotary kiln. The smelting slag is configured to enter the second rotary kiln from the first end. The height of the first end is higher than the height of the second end.

3. The smelting waste slag treatment device as described in claim 1, characterized in that, The first rotary kiln has a first connecting portion at its end near the second rotary kiln, and the diameter of the first connecting portion gradually decreases in the direction from the first rotary kiln toward the second rotary kiln.

4. The smelting waste slag treatment device as described in claim 1, characterized in that, Along the axial direction of the second rotary kiln, a plurality of first feeding components are provided at intervals on the inner wall of the second rotary kiln.

5. The smelting waste slag treatment device as described in claim 1, characterized in that, Along the axial direction of the first rotary kiln, the first rotary kiln is divided into three processing sections in sequence, with the middle processing section having the highest operating temperature; Each of the processing sections has a second feeding element on its inner wall, with a projection plane λ perpendicular to the axis of the first rotary kiln. The orthographic projections of the second feeding elements of adjacent processing sections on the projection plane λ are intersecting.

6. The smelting waste slag treatment device as described in claim 5, characterized in that, The second feeding component has an angled mounting portion and a feeding portion. The mounting portion is connected to the inner wall of the processing section. The angle between the mounting portion and the feeding portion is α, which satisfies: 75°≤α≤90°.

7. The smelting waste slag treatment device as described in claim 5, characterized in that, The three processing sections are sequentially referred to as the first processing section, the second processing section, and the third processing section along the axial direction of the first rotary kiln. The working temperature of the second processing section is higher than that of the third processing section, and the working temperature of the third processing section is higher than that of the first processing section. The first processing section is located near the second rotary kiln, and the peripheral wall of the first processing section has an opening configured for the inlet and outlet of smelting waste slag.

8. The smelting slag treatment device as described in claim 7, characterized in that, The first rotary kiln is set at an angle to the horizontal plane η, the height of the third processing section is higher than the height of the first processing section, and the angle between the first rotary kiln and the horizontal plane η is β, which satisfies: 2°≤β≤5°.

9. The smelting waste slag treatment device as described in claim 7, characterized in that, The first rotary kiln is also provided with an air inlet, and the sidewalls of each of the processing sections are provided with the air inlet; The air intake and the opening are arranged circumferentially in the first processing section.

10. The smelting slag treatment device as described in claim 9, characterized in that, The air intake component is detachably connected to the processing section.

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