Environment-friendly cupola furnace for metal casting

Abstract

The invention discloses an environment-friendly cupola furnace for metal casting, which relates to the technical field of cupola furnace tail gas treatment and is technically characterized by comprising a cupola furnace body and a tail gas inlet pipe fixedly mounted at the exhaust end of the cupola furnace body, and a tail gas purification and heat absorption mechanism is arranged at the exhaust end of the cupola furnace body. A filter screen cleaning mechanism is arranged on the tail gas purification and heat absorption mechanism, the output end of the tail gas purification and heat absorption mechanism communicates with a pure tail gas heat recovery mechanism, the tail gas purification and heat absorption mechanism comprises a purification box, and a filter screen is fixedly installed in the center of an inner cavity of the purification box and divides the inner cavity of the purification box into a dust cavity and a pure tail gas cavity; the tail gas purification and heat absorption mechanism effectively blocks dust and other impurities in the tail gas, the dust and other impurities are deposited at the bottom of the dust cavity, purification treatment of the tail gas is achieved, meanwhile, precious energy in the dust is absorbed by cooling water through the heat conduction effect, and the energy capture and utilization efficiency is improved.

Description

Technical Field

[0001] The invention relates to the technical field of cupola tail gas treatment, in particular to an environmentally friendly cupola for metal casting. Background Art

[0002] Cupola, as a metal melting equipment with a long history, is widely used in the foundry industry, especially playing a key role in the smelting process of ferroalloys and non-ferrous metals. It directly heats the charge to melt by blowing in air or oxygen-enriched air and burning it violently with fuels such as coke. In this process, in addition to meeting the heat energy required for smelting, a large amount of waste heat is also released. This waste heat usually exists in the form of flue gas and contains considerable energy potential.

[0003] At present, cupolas have deficiencies in tail gas treatment. Although dry dust removal, wet dust removal and composite dust removal methods are used to remove dust from tail gas and ensure that the purified tail gas meets the emission standards, the heat contained in the filtered dust and the tail gas itself has not been effectively recovered and utilized. Therefore, we propose a new type of environmentally friendly cupola for metal casting. Summary of the invention

[0004] 1. Technical issues to be solved

[0005] In view of the deficiencies of the prior art, the present invention provides an environmentally friendly cupola for metal casting, which solves the problem that the filtered dust in the cupola tail gas and the heat contained in the tail gas itself have not been effectively recovered and utilized.

[0006] (II) Technical solution

[0007] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: an environmentally friendly cupola for metal casting, comprising a cupola body and an exhaust gas inlet pipe fixedly installed at the exhaust end of the cupola body, the exhaust end of the cupola body is provided with an exhaust gas purification and heat absorption mechanism, a filter cleaning mechanism is provided on the exhaust gas purification and heat absorption mechanism, and the output end of the exhaust gas purification and heat absorption mechanism is connected to a pure exhaust gas heat recovery mechanism.

[0008] The exhaust gas purification heat absorption mechanism comprises a purification box, and a filter screen is fixedly installed at the center of the inner cavity of the purification box, and the filter screen divides the inner cavity of the purification box into a dust cavity and a pure exhaust gas cavity.

[0009] A hollow plate is fixedly installed on the side of the dust chamber away from the filter, an arc-shaped hollow fin is fixedly installed on the side of the hollow plate close to the filter, a three-way water injection pipe connected to the inner cavity of the hollow plate is fixedly installed on the top of the hollow plate, and a three-way drainage pipe connected to the inner cavity of the hollow plate is fixedly installed on the bottom of the hollow plate.

[0010] A clean exhaust gas conduit communicating with the inner cavity of the clean exhaust gas cavity is fixedly installed on the right side of the purification box, and a detachable bottom cover is threadedly connected at the center of the bottom of the purification box.

[0011] The filter screen comprises a hollow frame adapted to the purification box, a plurality of interlaced hollow metal conduits are fixed inside the hollow frame, and the hollow metal conduits are communicated with the inner cavity of the hollow frame.

[0012] Preferably, the dust chamber is communicated with the output end of the tail gas inlet pipe.

[0013] Preferably, the hollow plate and the arc-shaped hollow fins are both made of stainless steel sheet material.

[0014] Preferably, the other lower port of the three-way water injection pipe is connected to the top of the inner cavity of the hollow frame, the upper port of the three-way water injection pipe extends to the top of the purification box, the other upper port of the three-way drainage pipe is connected to the bottom of the inner cavity of the hollow frame, and the lower port of the three-way drainage pipe extends to the bottom of the purification box.

[0015] Preferably, the filter cleaning mechanism includes a gear part rotatably connected to the top center of the filter, a shaft rod is fixedly installed on one side of the gear part, a motor is fixedly installed on the end of the shaft rod away from the gear part, a guide rail is arranged below the gear part, a gear bar meshing with the gear part is slidably connected to the inner side of the guide rail, and a cleaning brush in contact with the filter is fixedly installed at the bottom of the gear bar.

[0016] Preferably, the motor is fixedly mounted on the outside of the purification box, and the output end of the motor is fixedly connected to the shaft.

[0017] Preferably, the clean exhaust gas heat recovery mechanism includes a water tank connected to the clean exhaust gas conduit, an arc-shaped ball heat exchange element is fixedly installed on one end of the clean exhaust gas conduit away from the purification box, an external exhaust pipe is fixedly installed on the end of the arc-shaped ball heat exchange element away from the clean exhaust gas conduit, and an electric valve is fixedly installed on the outside of the water tank.

[0018] Preferably, the arc-shaped ball heat exchange element comprises a plurality of arc-shaped heat exchange tubes connected to one end of the pure exhaust gas duct away from the purification box, and a plurality of hollow heat exchange plates are fixedly installed on the outer sides of the plurality of arc-shaped heat exchange tubes, and the hollow heat exchange plates are used to connect the plurality of arc-shaped heat exchange tubes.

[0019] (III) Beneficial effects

[0020] Compared with the prior art, the present invention provides a method having the following beneficial effects:

[0021] 1. The present invention effectively blocks dust and other impurities in the exhaust gas through the design of the exhaust gas purification heat absorption mechanism, and deposits them at the bottom of the dust chamber, thereby achieving exhaust gas purification. At the same time, the precious energy in these dust and impurities is absorbed by the cooling water through heat conduction, thereby improving the energy capture and utilization efficiency.

[0022] 2. The present invention not only ensures efficient filtration of dust particles in exhaust gas through the design of the filter and its cleaning mechanism, but also effectively extends the service life of the filter by regularly and automatically cleaning the filter, maintaining the overall performance of the exhaust gas purification and heat absorption mechanism, thereby ensuring the stability and efficiency of heat recovery.

[0023] 3. The present invention uses the arc-shaped ball heat exchange element to increase the heat exchange area and optimize the heat exchange path through the design of the pure tail gas heat recovery mechanism, thus further improving the tail gas heat recovery efficiency. The recovered heat can be used to preheat other media or for other processes, such as heating and hot water supply, thus achieving effective utilization of tail gas waste heat and reducing energy consumption. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a structural schematic diagram of the present invention;

[0025] Figure 2 It is a schematic diagram of the back structure of the present invention;

[0026] Figure 3 It is a schematic diagram of the detachable bottom cover structure of the present invention;

[0027] Figure 4 It is a front structural schematic diagram of the present invention;

[0028] Figure 5 It is a schematic diagram of the cross-sectional structure of the tail gas purification heat absorption mechanism of the present invention;

[0029] Figure 6 It is a schematic diagram of the structure of the filter cleaning mechanism of the present invention;

[0030] Figure 7 It is a schematic diagram of the filter structure of the present invention;

[0031] Figure 8 It is a schematic diagram of the cleaning brush structure of the present invention;

[0032] Fig. 9 It is a schematic diagram of the gear structure of the present invention;

[0033] Fig.10 It is a schematic cross-sectional structure diagram of the pure tail gas heat recovery mechanism of the present invention;

[0034] Fig.11 It is a schematic structural diagram of the arc-shaped ball heat exchange element of the present invention.

[0035] In the figure:

[0036] 1. Cupola body; 11. Exhaust gas inlet pipe;

[0037] 2. Exhaust gas purification heat absorption mechanism; 21. Purification box; 22. Filter; 221. Hollow frame; 222. Hollow metal conduit; 23. Dust chamber; 24. Pure exhaust chamber; 25. Hollow plate; 26. Arc-shaped hollow fin; 27. Three-way water injection pipe; 28. Three-way drainage pipe; 29. ​​Pure exhaust conduit; 210. Removable bottom cover;

[0038] 3. Filter cleaning mechanism; 31. Gear parts; 32. Shaft; 33. Motor; 34. Guide rail; 35. Gear bar; 36. Cleaning brush;

[0039] 4. Pure exhaust gas heat recovery mechanism; 41. Water tank; 42. Arc ball heat exchange element; 421. Arc heat exchange tube; 422. Hollow heat exchange plate; 43. External exhaust pipe; 44. Electric valve. DETAILED DESCRIPTION

[0040] In the present invention, unless otherwise specified, the directions used, such as "up" and "down", usually refer to the directions shown in the drawings, or to the vertical, perpendicular or gravity directions; similarly, for ease of understanding and description, "left" and "right" usually refer to the left and right shown in the drawings; "inside" and "outside" refer to the inside and outside relative to the outline of each component itself, but the above-mentioned directions are not used to limit the present invention.

[0041] The present invention provides a technical solution:

[0042] See also Figures 1 to 11 An environmentally friendly cupola for metal casting includes a cupola body 1 and an exhaust gas inlet pipe 11 fixedly installed at the exhaust end of the cupola body 1. The exhaust end of the cupola body 1 is provided with an exhaust gas purification and heat absorption mechanism 2, and a filter cleaning mechanism 3 is provided on the exhaust gas purification and heat absorption mechanism 2. The output end of the exhaust gas purification and heat absorption mechanism 2 is connected to a pure exhaust gas heat recovery mechanism 4.

[0043] The exhaust gas purification and heat absorption mechanism 2 includes a purification box 21, and a filter screen 22 is fixedly installed at the center of the inner cavity of the purification box 21. The filter screen 22 divides the inner cavity of the purification box 21 into a dust chamber 23 and a pure exhaust gas chamber 24. The filter screen 22 in the exhaust gas purification and heat absorption mechanism 2 and the dust chamber 23 and the pure exhaust gas chamber 24 on both sides thereof can realize the purification and diversion of the exhaust gas, ensure that the heat recovery is carried out in a purer environment, improve the heat recovery efficiency, reduce dust emissions and protect the environment.

[0044] A hollow plate 25 is fixedly installed on the side of the inner cavity of the dust chamber 23 away from the filter screen 22, and an arc-shaped hollow fin 26 is fixedly installed on the side of the hollow plate 25 close to the filter screen 22. A three-way water injection pipe 27 connected to the inner cavity of the hollow plate 25 is fixedly installed on the top of the hollow plate 25, and a three-way drainage pipe 28 connected to the inner cavity of the hollow plate 25 is fixedly installed on the bottom of the hollow plate 25. Through the hollow plate 25 and the arc-shaped hollow fin 26 in the dust chamber 23, in conjunction with the three-way water injection pipe 27 and the three-way drainage pipe 28, an efficient heat exchange system is formed, which can absorb heat in exhaust gas and dust, and through the circulation of cooling water, heat recovery and utilization are achieved, while keeping the cleanliness of the interior of the exhaust gas purification heat absorption mechanism 2.

[0045] A pure exhaust gas duct 29 connected to the inner cavity of the pure exhaust gas chamber 24 is fixedly installed on the right side of the purification box 21. A detachable bottom cover 210 is threadedly connected at the center of the bottom of the purification box 21. The pure exhaust gas duct 29 is used to export the purified exhaust gas to the heat recovery mechanism, and the detachable bottom cover 210 is convenient for cleaning the accumulated dust in the dust chamber 23. The two together ensure the efficient operation of the exhaust gas purification heat absorption mechanism 2 and the long-term stability of the blast furnace.

[0046] The filter 22 includes a hollow frame 221 that is compatible with the purification box 21. A plurality of interlaced hollow metal conduits 222 are fixed inside the hollow frame 221. The hollow metal conduits 222 are connected to the inner cavity of the hollow frame 221. The design of the hollow frame 221 of the filter 22 and the internal interlaced hollow metal conduits 222 increases the contact area between the exhaust gas and the cooling water, improves the heat recovery efficiency, and effectively blocks the dust in the exhaust gas, thereby ensuring the exhaust gas purification effect.

[0047] Furthermore, the dust chamber 23 is connected to the output end of the exhaust gas inlet pipe 11. The design that the lower left corner of the dust chamber 23 is connected to the exhaust gas inlet pipe 11 ensures that the high-temperature exhaust gas can smoothly enter the dust chamber 23, and the dust is effectively filtered through the filter 22 to provide pure exhaust gas for subsequent heat recovery, thereby improving the efficiency of the entire exhaust gas treatment process.

[0048] Furthermore, the hollow plate 25 and the arc-shaped hollow fins 26 are both made of stainless steel sheet material. By using stainless steel sheet to make the hollow plate 25 and the arc-shaped hollow fins 26, they have the characteristics of corrosion resistance and high temperature resistance, ensuring long-term stable heat absorption and conduction effects, and improving the reliability and efficiency of blast furnace exhaust gas energy recovery.

[0049] Furthermore, the other lower port of the three-way water injection pipe 27 is connected to the top of the inner cavity of the hollow frame 221, the upper port of the three-way water injection pipe 27 extends to the top of the purification box 21, and the other upper port of the three-way drainage pipe 28 is connected to the bottom of the inner cavity of the hollow frame 221, and the lower port of the three-way drainage pipe 28 extends to the bottom of the purification box 21. By designing the three-way water injection pipe 27 and the three-way drainage pipe 28, the circulation of cooling water inside the hollow plate 25 and the filter screen 22 is achieved, thereby effectively absorbing the heat in the exhaust gas, improving the energy utilization efficiency, and ensuring the stable operation of the exhaust gas purification heat absorption mechanism 2.

[0050] Furthermore, the filter cleaning mechanism 3 includes a gear member 31 rotatably connected to the top center of the filter 22, a shaft rod 32 is fixedly installed on one side of the gear member 31, a motor 33 is fixedly installed on the end of the shaft rod 32 away from the gear member 31, a guide rail 34 is arranged below the gear member 31, a gear bar 35 meshing with the gear member 31 is slidably connected to the inner side of the guide rail 34, a cleaning brush 36 in contact with the filter 22 is fixedly installed at the bottom of the gear bar 35, the gear member 31 is driven to rotate by the motor 33, and the gear bar 35 is driven to slide on the guide rail 34, so that the cleaning brush 36 brushes away the dust accumulated on the filter 22, ensuring the smooth flow of exhaust gas and continuous and efficient filtration of the filter 22, thereby improving the operating efficiency and stability of the blast furnace.

[0051] Furthermore, the motor 33 is fixedly installed on the outside of the purification box 21, and the output end of the motor 33 is fixedly connected to the shaft rod 32. The motor 33 is fixedly installed on the outside of the purification box 21 and is fixedly connected to the shaft rod 32 to ensure stable driving of the filter cleaning mechanism 3. Through the rotational output of the motor 33, the cleaning brush 36 on the filter is driven to move, thereby realizing automatic cleaning of the filter 22 and ensuring long-term and efficient operation of the cupola.

[0052] Furthermore, the pure exhaust gas heat recovery mechanism 4 includes a water tank 41 connected to the pure exhaust gas duct 29, an arc-shaped ball heat exchanger 42 is fixedly installed at one end of the pure exhaust gas duct 29 away from the purification box 21, an outer discharge pipe 43 is fixedly installed at one end of the arc-shaped ball heat exchanger 42 away from the pure exhaust gas duct 29, and an electric valve 44 is fixedly installed on the outside of the water tank 41. The heat in the pure exhaust gas is efficiently absorbed by the arc-shaped ball heat exchanger 42 and transferred to the water in the water tank 41, thereby realizing waste heat recovery; the electric valve 44 facilitates the control of the use of hot water, thereby improving the convenience and flexibility of energy utilization.

[0053] Furthermore, the arc-shaped spherical heat exchange element 42 includes a plurality of arc-shaped heat exchange tubes 421 connected to one end of the pure exhaust gas duct 29 away from the purification box 21, and a plurality of hollow heat exchange plates 422 are fixedly installed on the outer sides of the plurality of arc-shaped heat exchange tubes 421. The hollow heat exchange plates 422 are used to connect the plurality of arc-shaped heat exchange tubes 421. By combining the arc-shaped heat exchange tubes 421 with the hollow heat exchange plates 422, the heat exchange area is significantly increased, the heat exchange path is optimized, thereby improving the exhaust gas heat recovery efficiency and realizing efficient energy utilization.

[0054] When used specifically, the working principle of the present invention is as follows:

[0055] The tail gas generated by the cupola body 1 is guided from the tail gas inlet pipe 11 to the tail gas purification heat absorption mechanism 2 for further treatment.

[0056] The process of exhaust gas purification and dust heat absorption:

[0057] The high-temperature exhaust gas enters the dust chamber 23 of the exhaust gas purification heat absorption mechanism 2 from the exhaust gas inlet pipe 11. In the dust chamber 23, the exhaust gas first encounters the filter screen 22, which is composed of a hollow frame 221 and an internally interlaced hollow metal conduit 222, effectively blocking the dust particles and other impurities in the exhaust gas and causing them to settle at the bottom of the dust chamber 23. This step not only purifies the exhaust gas, but also provides a purer working environment for subsequent heat recovery.

[0058] In order to maximize the absorption of heat in the exhaust gas, cooling water is injected from the three-way water injection pipe 27 into the hollow plate 25, the arc-shaped hollow fins 26, and the hollow frame 221 and hollow metal conduit 222 of the filter 22. When the cooling water flows in the hollow plate 25 and the arc-shaped hollow fins 26, it absorbs the heat of dust and impurities in the dust chamber 23 through heat conduction, and at the same time, part of the heat in the exhaust gas is also absorbed by the arc-shaped hollow fins 26 and the cooling water inside the hollow plate 25. The cooling water in the hollow frame 221 and the hollow metal conduit 222 on the filter 22 further absorbs the heat of the exhaust gas when it passes through the filter. This design not only improves the heat recovery efficiency, but also ensures sufficient absorption of heat by increasing the heat exchange area and extending the heat exchange path.

[0059] The cooling water that has absorbed the heat is then discharged from the three-way drainage pipe 28 of the hollow plate 25 and the filter screen 22. The high-temperature water can be used to preheat other media or for other process steps, such as heating, hot water supply, etc., thus realizing the effective utilization of the waste heat of the exhaust gas.

[0060] Filter cleaning process:

[0061] In order to ensure the continuous and efficient filtering ability of the filter 22, the filter cleaning mechanism 3 automatically cleans the filter 22 regularly. After the motor 33 is started, the motor 33 drives the shaft 32 and the gear member 31 to rotate, meshing with the gear bar 35 and driving it to slide on the guide rail 34. The cleaning brush 36 at the bottom of the gear bar 35 slides accordingly, brushing away the dust on the surface of the filter 22 to ensure that the exhaust gas is unobstructed. This cleaning process not only effectively extends the service life of the filter 22, but also maintains the overall performance of the exhaust gas purification heat absorption mechanism 2, ensuring the stability and efficiency of heat recovery.

[0062] Pure exhaust gas heat recovery process:

[0063] The purified exhaust gas enters the pure exhaust gas heat recovery mechanism 4 through the pure exhaust gas duct 29. In the arc ball heat exchanger 42, the exhaust gas exchanges heat with the water in the water tank 41. The arc ball heat exchanger 42 is composed of 8 arc-shaped heat exchange tubes 421 and 7 hollow heat exchange plates 422. This design increases the heat exchange area, optimizes the heat exchange path, and improves the heat exchange efficiency. The heat in the exhaust gas is transferred to the water in the water tank 41, raising the water temperature. The heated water can be used in other process or heating systems, such as factory hot water supply, equipment preheating, etc., to achieve efficient recovery and utilization of exhaust gas heat. When the hot water in the water tank 41 is needed, it can be taken by simply opening the electric valve 44. The operation is simple and safe.

[0064] Maintenance and cleaning process:

[0065] In order to ensure the long-term stable operation of the cupola and the efficient operation of the tail gas purification heat absorption mechanism 2, it is necessary to regularly maintain and clean the purification box 21. The bottom of the purification box 21 can be opened through the detachable bottom cover 210, and the dust and impurities in the dust chamber 23 can be easily cleaned. This operation not only keeps the tail gas purification heat absorption mechanism 2 clean and efficient, but also extends the service life of the entire cupola, reducing maintenance costs and environmental burdens.

[0066] In summary, the environmentally friendly cupola for metal casting realizes full utilization of tail gas waste heat and purification of emissions through the effective combination of tail gas purification heat absorption mechanism 2 and pure tail gas heat recovery mechanism 4. This innovative design not only improves the energy utilization efficiency of the foundry industry, but also reduces environmental pollution and promotes the sustainable development of the foundry industry.

[0067] The above are only specific embodiments of the present invention, but the technical features of the present invention are not limited thereto. Any simple changes, equivalent replacements or modifications made based on the present invention to solve basically the same technical problems and achieve basically the same technical effects are all included in the protection scope of the present invention.

Claims

1. An environmentally friendly cupola for metal casting, comprising a cupola body (1) and an exhaust gas inlet pipe (11) fixedly installed at the exhaust end of the cupola body (1), characterized in that: The exhaust end of the cupola body (1) is provided with an exhaust gas purification heat absorption mechanism (2), a filter screen cleaning mechanism (3) is provided on the exhaust gas purification heat absorption mechanism (2), and the output end of the exhaust gas purification heat absorption mechanism (2) is connected to a pure exhaust gas heat recovery mechanism (4); The exhaust gas purification heat absorption mechanism (2) comprises a purification box (21), a filter screen (22) is fixedly installed at the center of the inner cavity of the purification box (21), and the filter screen (22) divides the inner cavity of the purification box (21) into a dust cavity (23) and a pure exhaust gas cavity (24); A hollow plate (25) is fixedly mounted on a side of the inner cavity of the dust chamber (23) away from the filter screen (22), and an arc-shaped hollow fin (26) is fixedly mounted on a side of the hollow plate (25) close to the filter screen (22); A three-way water injection pipe (27) communicating with the inner cavity of the hollow plate (25) is fixedly installed on the top of the hollow plate (25), and a three-way drainage pipe (28) communicating with the inner cavity of the hollow plate (25) is fixedly installed on the bottom of the hollow plate (25); A clean exhaust gas conduit (29) communicating with the inner cavity of the clean exhaust gas cavity (24) is fixedly installed on the right side of the purification box (21), and a detachable bottom cover (210) is threadedly connected at the center of the bottom of the purification box (21); The filter screen (22) comprises a hollow frame (221) adapted to the purification box (21), a plurality of interlaced hollow metal conduits (222) being fixed inside the hollow frame (221), and the hollow metal conduits (222) are communicated with the inner cavity of the hollow frame (221).

2. The environmentally friendly cupola for metal casting according to claim 1, characterized in that: The dust chamber (23) is in communication with the output end of the tail gas inlet pipe (11).

3. The environmentally friendly cupola for metal casting according to claim 1, characterized in that: The hollow plate (25) and the arc-shaped hollow fins (26) are both made of stainless steel sheet material.

4. The environmentally friendly cupola for metal casting according to claim 1, characterized in that: The other lower end of the three-way water injection pipe (27) is connected to the top of the inner cavity of the hollow frame (221), and the upper end of the three-way water injection pipe (27) extends to the top of the purification box (21); The other upper port of the three-way drainage pipe (28) is connected to the bottom of the inner cavity of the hollow frame (221), and the lower port of the three-way drainage pipe (28) extends to the bottom of the purification box (21).

5. The environmentally friendly cupola for metal casting according to claim 1, characterized in that: The filter cleaning mechanism (3) comprises a gear member (31) rotatably connected to the center of the top of the filter (22); a shaft (32) is fixedly mounted on one side of the gear member (31); a motor (33) is fixedly mounted on one end of the shaft (32) away from the gear member (31); a guide rail (34) is arranged below the gear member (31); a gear bar (35) meshing with the gear member (31) is slidably connected to the inner side of the guide rail (34); and a cleaning brush (36) in contact with the filter (22) is fixedly mounted on the bottom of the gear bar (35).

6. The environmentally friendly cupola for metal casting according to claim 5, characterized in that: The motor (33) is fixedly mounted on the outside of the purification box (21), and the output end of the motor (33) is fixedly connected to the shaft (32).

7. The environmentally friendly cupola for metal casting according to claim 1, characterized in that: The clean exhaust gas heat recovery mechanism (4) comprises a water tank (41) connected to the clean exhaust gas conduit (29); an arc-shaped ball heat exchanger (42) is fixedly mounted on one end of the clean exhaust gas conduit (29) away from the purification box (21); an outer discharge pipe (43) is fixedly mounted on one end of the arc-shaped ball heat exchanger (42) away from the clean exhaust gas conduit (29); and an electric valve (44) is fixedly mounted on the outer side of the water tank (41).

8. The environmentally friendly cupola for metal casting according to claim 7, characterized in that: The arc-shaped spherical heat exchange element (42) comprises a plurality of arc-shaped heat exchange tubes (421) connected to one end of the clean exhaust gas conduit (29) away from the purification box (21); A plurality of hollow heat exchange plates (422) are fixedly mounted on the outer sides of the plurality of arc-shaped heat exchange tubes (421), and the hollow heat exchange plates (422) are used to connect the plurality of arc-shaped heat exchange tubes (421).

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