A copper smelting offgas conversion apparatus and conversion method

Abstract

The application discloses a copper smelting flue gas conversion device and a conversion method. The device comprises a converter, which comprises a conversion assembly and a catalyst layer. The conversion assembly comprises a conversion shell, which has a first inlet and a second inlet. The first inlet can guide one flue gas into the conversion shell. A heat exchanger is arranged in the conversion shell. The heat exchanger can improve the temperature of the flue gas entering the conversion shell from the first inlet. The second inlet can also guide another cold flue gas into the conversion shell and cool the flue gas. The catalyst layer is arranged in the conversion shell and used for reacting with the cooled flue gas. A flow guide assembly is arranged in the conversion shell. The flow guide assembly can guide the flue gas heated by the heat exchanger to fully mix with the cold flue gas. The application can ensure good working efficiency and safety in long-term use, thereby facilitating actual use.

Description

Technical Field

[0001] This invention relates to the field of acid production technology from copper smelting flue gas, and particularly to a copper smelting flue gas conversion device and conversion method. Background Technology

[0002] Non-equilibrium high-concentration conversion technology is an acid production process that converts high-concentration sulfur dioxide flue gas in stages and controls the reaction process to avoid catalyst overheating. Since its development and application, a common problem has been uneven flue gas distribution and large temperature deviations at the bottom of the bed. Furthermore, key technical indicators such as catalyst loading and operating gas velocity have not been quantified, leading to variations in the design and operational shortcomings of different non-equilibrium high-concentration conversion technologies. During the conversion process, existing technologies suffer from uneven flue gas distribution at the bed inlet and flue gas temperature control limits exceeding design values ​​due to flow deviations. This limits the acid production system's adaptability to gas concentration and output. Uneven flue gas distribution also leads to inconsistent flue gas temperatures at different locations within the reactor. When this flue gas passes through the catalyst layer, some excessively hot flue gas can have irreversible effects on the catalyst layer, requiring frequent maintenance. Therefore, ensuring uniform gas mixing and distribution is a problem that needs to be solved in the field of acid production from smelting flue gas. Summary of the Invention

[0003] The purpose of this invention is to address the shortcomings mentioned above by providing a copper smelting flue gas conversion device and method that achieves uniform gas mixing and distribution.

[0004] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: a copper smelting flue gas conversion device, comprising:

[0005] The converter includes a conversion component and a catalyst layer;

[0006] The conversion assembly includes a conversion housing, which has a first inlet and a second inlet, wherein the first inlet is capable of guiding one of the flue gases into the conversion housing;

[0007] A heat exchanger is disposed inside the conversion shell. The heat exchanger can increase the temperature of the flue gas entering the conversion shell from the first inlet. The second inlet can also guide another stream of cold flue gas into it and cool down the heated flue gas. The catalyst layer is disposed inside the conversion shell and is used to react with the cooled flue gas.

[0008] A flow guiding component is disposed within the conversion housing, which guides the flue gas heated by the heat exchanger to mix thoroughly with the cold flue gas.

[0009] Furthermore, the conversion housing includes an outer shell, an annular shell is provided on the outer shell, a first annular chamber is provided between the annular shell and the heat exchanger, and the second inlet is provided on the annular shell and communicates with the first annular chamber;

[0010] The outer shell also has a second annular chamber inside, and the bottom of the annular shell is provided with a first flue gas outlet communicating with the second annular chamber, so that the flue gas heated by the heat exchanger can enter the second annular chamber;

[0011] The outer shell also has a third annular chamber inside, and the outer shell has a second smoke vent that communicates with the third annular chamber at the corresponding second annular chamber. The number of the second smoke vents is multiple and they are distributed in a ring.

[0012] The catalyst layer is disposed in the corresponding third annular cavity of the outer shell.

[0013] Furthermore, the heat exchanger includes a transmission pipe centrally disposed within the outer casing, the top of the transmission pipe being open and extending outside the outer casing, a heating jacket being disposed on the outside of the transmission pipe, and multiple heat-conducting pipes passing through the heating jacket;

[0014] The heating sleeve has a first opening on its lower side that communicates with the third annular chamber, and the first opening is located at the bottom of the catalyst layer. The heating sleeve also has a second opening and a third opening. The first opening and the third opening are both connected to the interior of the heating sleeve, and the third opening is also connected to the transmission tube.

[0015] Furthermore, the flow guiding component includes a first guiding component, a second guiding component, and a third guiding component;

[0016] The first guiding component is used to guide the two streams of flue gas in the third annular chamber to mix fully and react with the catalyst layer;

[0017] The second guide component is used to guide the cold flue gas to be evenly distributed throughout the first annular chamber;

[0018] The third guide component is used to guide and mix the flue gas discharged from each of the second exhaust ports.

[0019] Furthermore, the first guide assembly includes a blocking ring disposed in the corresponding third annular cavity of the outer shell and having an annular shape. The blocking ring is located at the bottom of the second exhaust port. The blocking ring has multiple exhaust ports for the mixed flue gas to pass through downward. The corresponding third annular cavity of the outer shell is provided with multiple guide plates in the shape of a "Z" and each guide plate is located at the bottom of the corresponding exhaust port. The guide plate has multiple perforations.

[0020] The guide plate can guide the flue gas to flow to its opposite sides and bottom as it passes from top to bottom, and make the flue gas evenly distributed.

[0021] Furthermore, the second guide assembly includes a plurality of swirl plates disposed on the inner wall of the annular shell. The swirl plates are located within the first annular cavity and have a gap between them and the transmission pipe for the passage of flue gas. The swirl plates are in two sets, with each set containing no fewer than five.

[0022] The two sets of swirl plates are distributed vertically on the inner walls of the annular shell on both sides perpendicular to the second inlet. The swirl plates are arranged in a herringbone shape to guide the cold flue gas from the first exhaust port to exit evenly.

[0023] Furthermore, the third guiding component includes multiple guide tubes, each of which is interconnected and disposed on the corresponding second exhaust port, and the airflow from two guide tubes can be guided to collide with each other.

[0024] Furthermore, a sealing plate is also provided in the corresponding second smoke exhaust port where the third guide component is provided, and the sealing plate is used to adjust the diameter of the second smoke exhaust port duct.

[0025] The diameter of the air outlet of the third guide component is smaller than the diameter of the air inlet of the second smoke outlet.

[0026] A method for converting copper smelting flue gas includes the following steps:

[0027] S1. Flue gas enters the conversion shell from the first inlet 103, and the temperature of the flue gas is 200℃.

[0028] S2. The flue gas is heated at the heating end of the heat exchanger, and its temperature after heating is 400℃.

[0029] S3. After step S2, the flue gas continues to flow to the catalyst layer and reacts with it. After the reaction, the flue gas is heated to 600°C. After the temperature rises, the flue gas enters the medium transmission end of the heat exchanger and is used as a heating medium to heat the flue gas that continues to pass through the heating end of the heat exchanger.

[0030] S4. When the flue gas is unevenly distributed and has different temperatures during the conveying process in step S3, another flue gas with a temperature of 200°C is introduced from the second inlet 104 to mix with it. During the mixing, the flow guiding component guides the two flue gases to mix evenly. After the mixing is completed, the flue gas is discharged from the output end of the heat exchanger.

[0031] The beneficial effects of this invention are reflected in:

[0032] In this invention, a stream of flue gas with a temperature of 200°C is guided into the conversion shell from the first inlet. This flue gas is heated to 400°C after passing through the heating end of the heat exchanger, and then continues to flow to the catalyst layer where it reacts. During this process, the flue gas reacts with the catalyst layer and heats up to 600°C. It then enters the medium transfer end of the heat exchanger, where it heats the flue gas continuously passing through the heating end. If the flue gas distribution within the conversion shell is uneven, another stream of flue gas with a temperature of 200°C is introduced from the second inlet to mix with it. Combined with the flow guiding component, the two streams of flue gas are thoroughly and evenly mixed, resulting in a uniform distribution of flue gas within the conversion shell. The temperature of the flue gas passing through each catalyst layer remains within a suitable range, ensuring good working efficiency and safety of the device during long-term use. Attached Figure Description

[0033] Figure 1 This is a perspective view of the present invention;

[0034] Figure 2 This is a schematic diagram of the catalyst layer in this invention;

[0035] Figure 3 This is a schematic diagram of the structure of the first guide component in this invention;

[0036] Figure 4 This is a schematic diagram of the structure of the second guide component in this invention;

[0037] Figure 5 This is a schematic diagram of the structure of the third guide component in this invention;

[0038] Figure 6 This is a schematic diagram of flue gas flow according to the present invention.

[0039] In the picture:

[0040] 1. Conversion shell; 101. Outer shell; 102. First annular chamber; 103. First inlet; 104. Second inlet; 105. First exhaust port; 106. Second annular chamber; 107. Second exhaust port; 108. Third annular chamber; 2. Heat exchanger; 201. Transfer pipe; 202. Heating jacket; 203. First opening; 204. Second opening; 205. Third opening; 3. Catalyst layer; 301. First refractory ceramic ball layer; 302. First catalyst; 303. Second catalyst; 304. Second refractory ceramic ball layer; 305. Rectangular saddle ring; 306. Support perforated plate; 307. Screen; 4. First guide assembly; 401. Blocking ring; 402. Exhaust port; 403. Guide plate; 404. Perforation; 5. Second guide assembly; 6. Third guide assembly. Detailed Implementation

[0041] The technical solutions of the embodiments of the present invention 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 the present invention, and not all of them. Unless otherwise specified, the embodiments and features in the embodiments of this application can be combined with each other. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0042] Please see Figure 1-6 The present invention discloses a copper smelting flue gas conversion device, including a converter, which includes a conversion component and a catalyst layer 3. The conversion component includes a conversion shell 1, which has a first inlet 103 and a second inlet 104. The first inlet 103 can guide one of the flue gases into the conversion shell 1.

[0043] In one embodiment, a heat exchanger 2 is provided inside the conversion shell 1. The heat exchanger 2 can increase the temperature of the flue gas entering the conversion shell 1 from the first inlet 103, while the second inlet 104 can also guide another stream of cold flue gas into it to cool down and neutralize the heated flue gas. There are multiple catalyst layers 3 distributed in a ring inside the conversion shell 1, which are used to react with the cooled flue gas. The flow guiding component can guide the flue gas heated by the heat exchanger 2 to mix fully with the cold flue gas. The heat exchanger 2 has a heating end and a medium transmission end, and the medium transmission end is used to guide the flow of the heat exchange medium.

[0044] The catalyst layer 3 mentioned above includes, from top to bottom, a first refractory ceramic ball layer 301, a first catalyst 302, a second catalyst 303, a second refractory ceramic ball layer 304, a rectangular saddle ring 305, and a support perforated plate 306. Screens 307 are provided at the top of the first catalyst 302 and at the bottom of the second catalyst 303 for reacting with the flue gas. The catalyst layer 3 mentioned above is common knowledge in the field, so its specific working principle will not be described in detail here.

[0045] In practice, one stream of flue gas is guided into the conversion shell 1 from the first inlet 103. The temperature of this flue gas is 200°C. After passing through the heating end of the heat exchanger 2, it is heated to 400°C. It then continues to flow to the catalyst layer 3 and reacts with it. During this process, the flue gas reacts with the catalyst layer 3 and heats up to 600°C. It then enters the medium transfer end of the heat exchanger 2, which can heat the flue gas continuously passing through the heating end of the heat exchanger 2. During this process, when the distribution of the flue gas in the conversion shell 1 is uneven, another stream of flue gas with a temperature of 200°C is introduced from the second inlet 104 to mix with it. With the help of the flow guiding component, the two streams of flue gas can be fully and evenly mixed, thus making the flue gas distribution in the conversion shell 1 uniform. The temperature of the flue gas passing through each catalyst layer 3 is kept within a suitable range, thereby ensuring that the device has good working efficiency and safety during long-term use.

[0046] In one embodiment, the conversion housing 1 includes an outer shell 101, on which an annular shell is integrally connected. A first annular chamber 102 is provided between the annular shell and the heat exchanger 2. A second inlet 104 is opened on the annular shell and communicates with the first annular chamber 102. The interior of the outer shell 101 also has a second annular chamber 106. A first exhaust port 105 communicating with the second annular chamber 106 is opened at the bottom of the annular shell. The flue gas heated by the heat exchanger 2 can enter the second annular chamber 106. The interior of the outer shell 101 also has a third annular chamber 108. The outer shell 101 has a second exhaust port 107 communicating with the third annular chamber 108 at the corresponding location of the second annular chamber 106. There are multiple second exhaust ports 107 distributed in a ring. Each catalyst layer 3 is installed in the corresponding third annular chamber 108 of the outer shell 101.

[0047] In specific implementation, one stream of flue gas enters the outer shell 101 through the first inlet 103. It passes directly through the heating end of the heat exchanger 2 and is transferred to the second annular chamber 106. During this process, the flue gas is heated and passes through the second exhaust port 107 into the third annular chamber 108 to react with the catalyst layer 3. After the flue gas reacts, it is heated and then enters the medium transfer end of the heat exchanger 2. Therefore, it can be used as a heat exchange medium to heat the flue gas that subsequently enters the outer shell 101 through the first inlet 103.

[0048] In one embodiment, the heat exchanger 2 includes a transmission pipe 201 centrally installed inside the outer casing 101. The top of the transmission pipe 201 is open and extends outside the outer casing 101. A heating jacket 202 is installed on the outside of the transmission pipe 201. A plurality of heat-conducting pipes are inserted through the heating jacket 202. The lower side of the heating jacket 202 has a first opening 203 communicating with the third annular chamber 108. The first opening 203 is located at the bottom of the catalyst layer 3. The heating jacket 202 also has a second opening 204 and a third opening 205. The first opening 203 and the third opening 205 are both in communication with the interior of the heating jacket 202. The third opening 205 is also in communication with the transmission pipe 201.

[0049] In practice, the flue gas entering the outer shell 101 through the first inlet 103 passes through each heat pipe and enters the second annular chamber 106. After it has reacted with the catalyst layer 3, it enters the heating sleeve 202 through the first opening 203. At this time, it heats the flue gas that subsequently passes through each heat pipe. The flue gas entering the heating sleeve 202 then enters the transmission pipe 201 through the second opening 204 and the third opening 205, and is finally transmitted out.

[0050] In one embodiment, the flow guiding assembly includes a first guide assembly 4, a second guide assembly 5, and a third guide assembly 6 disposed within the conversion housing 1.

[0051] In specific implementation, the first guide component 4 is used to guide the two streams of flue gas in the third annular chamber 108 to mix fully and react with the catalyst layer 3; the second guide component 5 is used to guide the cold flue gas entering the first annular chamber 102 from the second inlet 104 to be evenly distributed to all parts of the first annular chamber 102; and the third guide component 6 is used to guide the flue gas discharged from each of the second exhaust ports 107 to mix them.

[0052] In one embodiment, the first guide assembly 4 includes a blocking ring 401 installed in the corresponding third annular chamber 108 of the housing 101 and having an annular shape. The blocking ring 401 is located at the bottom of the second exhaust port 107. The blocking ring 401 has a plurality of exhaust ports 402 for the mixed flue gas to pass through downward. The corresponding third annular chamber 108 of the housing 101 has a plurality of guide plates 403 with a Z-shaped shape installed in it. Each guide plate 403 is located at the bottom of the corresponding exhaust port 402. The guide plate 403 has a plurality of through holes 404.

[0053] In practice, the mixed flue gas is discharged from the second exhaust port 107, which is blocked by the blocking ring 401 and can only be discharged from each exhaust port 402. At this time, multiple streams of flue gas discharged from each exhaust port 402 will pass through the corresponding guide plate 403. The guide plate 403 and the perforation 404 cooperate to guide the flue gas to flow to their respective sides and bottom. The multiple streams of flue gas can collide and mix with each other by flowing in the above manner, thus making the flue gas evenly distributed and effectively improving the mixing uniformity of the gas.

[0054] In one embodiment, the second guide assembly 5 includes a plurality of swirl plates mounted on the inner wall of the annular shell. The swirl plates are located in the first annular chamber 102 and have a gap between them and the transmission pipe 201 to allow flue gas to pass through. There are two sets of swirl plates, each set containing no less than five plates. The two sets of swirl plates are distributed vertically on the inner walls of the annular shell on both sides perpendicular to the second inlet 104. At the same time, the swirl plates can be arranged in a herringbone pattern to guide the cold flue gas passing through the first exhaust port 105 to exit evenly.

[0055] In practice, when the cold flue gas enters the first annular chamber 102 from the second inlet 104, part of the flue gas will pass directly through the gap and flow downwards, while the other part of the flue gas will flow along the guiding direction of the two sets of swirl plates. In this way, the cold flue gas can be evenly and gradually flow downwards in all parts of the first annular chamber 102, so that it can be evenly discharged from each of the first exhaust ports 105 to all parts of the first annular chamber 102.

[0056] In one embodiment, the third guide component 6 includes a plurality of guide tubes, each guide tube being interconnected and disposed on a corresponding second exhaust port 107, and the airflows blown out by the two guide tubes can be guided to collide with each other.

[0057] In specific implementation, the number of second exhaust ports 107 is preferably twelve, of which four are blocked. The number of guide pipes is eight and they are installed at each of the unblocked second exhaust ports 107. The guide pipes are L-shaped and can guide the flue gas through multiple unblocked second exhaust ports 107 and discharge it from the guide pipes. The multiple flue gases collide and mix with each other, thereby improving the uniformity of mixing.

[0058] In one embodiment, a sealing plate (not shown in the figure) is also installed in the corresponding second smoke exhaust port 107 where the third guide component 6 is provided. Specifically, the sealing plate will block half of the space inside the second smoke exhaust port 107. The sealing plate is used to adjust the air outlet diameter of the second smoke exhaust port 107, and the diameter of the air outlet end of the third guide component 6 is smaller than the diameter of the air inlet end of the second smoke exhaust port 107.

[0059] In practice, the above-mentioned setup allows the flue gas discharged from each pair of opposite guide pipes to be forced to collide and mix, thus further improving the uniformity of the gas mixture.

[0060] A method for converting copper smelting flue gas includes the following steps:

[0061] S1. Flue gas enters the conversion shell 1 from the first inlet 103, and the temperature of the flue gas is 200°C.

[0062] S2. The flue gas is heated at the heating end of heat exchanger 2, and its temperature after heating is 400℃.

[0063] S3. After step S2, the flue gas continues to flow to the catalyst layer 3 and reacts with it. After the reaction, the flue gas is heated to 600°C. After the temperature rises, the flue gas enters the medium transmission end of the heat exchanger 2 and is used as a heating medium to heat the flue gas that continues to pass through the heating end of the heat exchanger 2.

[0064] S4. When the flue gas is unevenly distributed and has different temperatures during the conveying process in step S3, another flue gas with a temperature of 200°C is introduced from the second inlet 104 to mix with it. During the mixing, the flow guiding component guides the two flue gases to mix evenly. After the mixing is completed, the flue gas is discharged from the output end of the heat exchanger 2.

[0065] It should be noted that if the embodiments of the present invention involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicators will also change accordingly.

[0066] Furthermore, if the embodiments of this invention involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. If the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this invention.

[0067] Additionally, "multiple" refers to two or more.

[0068] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A copper smelting flue gas conversion device, characterized in that, include: The converter includes a conversion component and a catalyst layer (3); The conversion assembly includes a conversion housing (1), which has a first inlet (103) and a second inlet (104). The first inlet (103) can guide one of the flue gases into the conversion housing (1). A heat exchanger (2) is disposed inside the conversion shell (1). The heat exchanger (2) can increase the temperature of the flue gas entering the conversion shell (1) from the first inlet (103). The second inlet (104) can also guide another stream of cold flue gas into it and cool down the flue gas after it has been heated. The catalyst layer (3) is disposed inside the conversion shell (1) and is used to react with the cooled flue gas. A flow guiding component is disposed inside the conversion housing (1), which can guide the flue gas heated by the heat exchanger (2) to mix fully with the cold flue gas; The conversion housing (1) includes an outer shell (101), an annular shell is provided on the outer shell (101), a first annular chamber (102) is provided between the annular shell and the heat exchanger (2), and a second inlet (104) is provided on the annular shell and communicates with the first annular chamber (102); The outer shell (101) also has a second annular chamber (106) inside. The bottom of the annular shell is provided with a first exhaust port (105) communicating with the second annular chamber (106). The flue gas heated by the heat exchanger (2) can enter the second annular chamber (106). The outer shell (101) also has a third annular chamber (108) inside. The outer shell (101) has a second smoke outlet (107) communicating with the third annular chamber (108) at the corresponding second annular chamber (106). The number of the second smoke outlets (107) is multiple and they are arranged in a ring. The catalyst layer (3) is disposed in the corresponding third annular chamber (108) of the outer shell (101); The flow guiding component includes a first guiding component (4), a second guiding component (5), and a third guiding component (6). The first guide component (4) is used to guide the two streams of flue gas in the third annular chamber (108) to mix fully and react with the catalyst layer (3); The second guide component (5) is used to guide the cold flue gas to be evenly distributed throughout the first annular chamber (102); The third guide component (6) is used to guide and mix the flue gas discharged from each of the second exhaust ports (107); The first guide assembly (4) includes a blocking ring (401) disposed in the corresponding third annular chamber (108) of the outer shell (101) and having an annular shape. The blocking ring (401) is located at the bottom of the second exhaust port (107). The blocking ring (401) has multiple exhaust ports (402) for the mixed flue gas to pass through downward. The corresponding third annular chamber (108) of the outer shell (101) is provided with multiple guide plates (403) in the shape of a zigzag. Each guide plate (403) is located at the bottom of the corresponding exhaust port (402). The guide plate (403) has multiple perforations (404). The guide plate (403) can guide the flue gas to flow to its opposite sides and bottom as it passes from top to bottom, and make the flue gas evenly distributed.

2. The copper smelting flue gas conversion device according to claim 1, characterized in that: The heat exchanger (2) includes a transmission pipe (201) centrally disposed inside the outer shell (101), the top of the transmission pipe (201) being open and extending outside the outer shell (101), and a heating jacket (202) being disposed on the outside of the transmission pipe (201), with multiple heat-conducting pipes passing through the heating jacket (202); The heating sleeve (202) has a first opening (203) on its lower side that communicates with the third annular chamber (108), and the first opening (203) is located at the bottom of the catalyst layer (3). The heating sleeve (202) also has a second opening (204) and a third opening (205). The first opening (203) and the third opening (205) are both in communication with the interior of the heating sleeve (202), and the third opening (205) is also in communication with the transmission pipe (201).

3. The copper smelting flue gas conversion device according to claim 1, characterized in that: The second guide assembly (5) includes a plurality of swirl plates disposed on the inner wall of the annular shell. The swirl plates are located in the first annular chamber (102) and have a gap between them and the transmission pipe (201) for the passage of flue gas. The swirl plates are in two sets, each set having no less than five. The two sets of swirl plates are distributed on the inner walls of the annular shell perpendicular to the second inlet (104). The swirl plates are arranged in a herringbone shape to guide the cold flue gas from the first exhaust port (105) to exit evenly.

4. The copper smelting flue gas conversion device according to claim 1, characterized in that: The third guide component (6) includes multiple guide tubes, each of which is connected to each other and is disposed on the corresponding second exhaust port (107), and the airflows blown out by the two guide tubes can be guided to collide with each other.

5. The copper smelting flue gas conversion device according to claim 1, characterized in that: A sealing plate is also provided in the corresponding second smoke outlet (107) where the third guide component (6) is provided, and the sealing plate is used to adjust the air outlet diameter of the second smoke outlet (107); The diameter of the air outlet of the third guide component (6) is smaller than the diameter of the air inlet of the second smoke outlet (107).

6. A method for converting copper smelting flue gas, comprising a copper smelting flue gas conversion device as described in any one of claims 1-5, characterized in that: Includes the following steps: S1. Flue gas enters the conversion shell (1) from the first inlet (103), and the temperature of the flue gas is 200°C. S2. The flue gas is heated at the heating end of the heat exchanger (2) and its temperature after heating is 400℃. S3. After step S2, the flue gas continues to flow to the catalyst layer (3) and reacts with it. After the reaction, the flue gas is heated to 600°C. After the temperature rises, the flue gas enters the medium transmission end of the heat exchanger (2) and is used as a heating medium to heat the flue gas that continues to pass through the heating end of the heat exchanger (2). S4. When the flue gas is unevenly distributed and has different temperatures during the conveying process in step S3, another flue gas with a temperature of 200°C is introduced from the second inlet 104 to mix with it. During the mixing, the guide component guides the two flue gases to mix evenly. After the mixing is completed, the flue gas is discharged from the output end of the heat exchanger (2).

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