Flue gas heat exchange device of rotary hearth furnace

Abstract

The invention relates to the field of rotary hearth furnaces, in particular to a rotary hearth furnace flue gas heat exchange device which comprises a furnace body, the furnace body comprises an annular outer lining plate, an annular sintering table is arranged on the inner ring of the outer lining plate, a heat source is arranged below the sintering table, a heat extraction assembly is arranged on the inner ring of the sintering table and comprises an annular plate, and an annular heat collection plate is arranged below the annular plate. An annular opening is formed in the upper end face of the heat collection plate, an inner side plate of the heat collection plate is opposite to the annular plate, an outer side plate of the heat collection plate is opposite to the lower edge of the inner ring of the sintering table, the outer wall of the heat collection plate communicates with a main pipe, the main pipe extends upwards to the position above the furnace body, and a feeding assembly is arranged above the furnace body. The flue gas heat exchange device is designed to be used for preheating the spherical materials, the spherical materials can be preheated, meanwhile, residual heat is used for heating water, the two ways of heating water and preheating the spherical materials are comprehensively designed, the waste gas heat utilization rate is higher, and the requirements of different manufacturers can be better met.

Description

Technical Field

[0001] The invention relates to the technical field of rotary hearth furnaces, in particular to a flue gas heat exchange device for a rotary hearth furnace. Background Art

[0002] The rotary hearth furnace is an industrial furnace equipment used for metal smelting and recycling. It is widely used in the steel, non-ferrous metals and other industries. It presses waste materials such as iron-containing and zinc-containing dust into spherical materials, and then puts the spherical materials into the rotary hearth furnace. After being heated to above 1000°C, it enters the reduction zone with a higher temperature. Zinc oxide and iron oxide are reduced by the carbon contained in iron materials such as pellets, thereby realizing the recycling of resources.

[0003] When the spherical material is heated at high temperature, a large amount of waste gas will be generated, and the waste gas temperature is relatively high. If it is directly discharged into the natural environment, it will not only cause a waste of heat resources, but also pollute the environment. In addition, there are also related recycling auxiliary equipment for the treatment of waste gas, that is, equipment related to flue gas heat exchange, and these auxiliary equipment are generally steam engine power generation equipment, that is, the temperature of the waste gas is used to heat water, and the water generates steam to drive the steam engine to generate electricity. The auxiliary equipment for the recycling of heat resources is relatively single and fails to meet existing needs. Summary of the invention

[0004] Therefore, the technical problem to be solved by the present invention is to overcome the problem of single auxiliary equipment for heat resource recycling of the rotary hearth furnace in the prior art.

[0005] In order to solve the above technical problems, the present invention provides a rotary hearth furnace flue gas heat exchange device, comprising a furnace body, the furnace body comprising an annular outer lining plate, an annular sintering table is arranged in the inner circle of the outer lining plate, a heat source is arranged below the sintering table, a heat extraction component is arranged in the inner circle of the sintering table, the heat extraction component comprises an annular plate, an annular heat collecting plate is arranged below the annular plate, an annular opening is arranged on the upper end surface of the heat collecting plate, an inner side plate of the heat collecting plate is opposite to the annular plate, an outer side plate of the heat collecting plate is opposite to the lower edge of the inner circle of the sintering table, and an outer wall of the heat collecting plate is connected to a main pipe, the main pipe extends upward to the top of the furnace body, and a feeding component is arranged above the furnace body;

[0006] The feeding assembly comprises a funnel-shaped feeding tower, a lower port in the feeding tower is opposite to the feeding area of ​​the furnace body, one side of the feeding tower is connected to the main pipe, and a spiral blade is also provided at the axis position in the feeding tower.

[0007] In one embodiment of the present invention, a pushing assembly is also provided on the heat extraction assembly, and the pushing assembly is used to push the spherical material on the sintering table, and the pushing assembly includes a turntable arranged at the center of the sintering table, and a plurality of push plates are provided on the edge of the turntable, and the push plates penetrate the annular plate and extend to above the sintering table, and an arc-shaped cover plate is provided above the push plate, and one end of the cover plate extends to the loading area of ​​the furnace body, and the other end of the cover plate extends to the unloading area of ​​the furnace body.

[0008] In one embodiment of the present invention, the upper surface of the sintering table is concave downward, and the lower surface of the sintering table is concave upward; the shape of each push plate is matched with the concave shape of the upper surface of the sintering table.

[0009] In one embodiment of the present invention, a heat flow dispersion component is provided in the feed tower, and the heat flow dispersion component includes a plurality of vertical pipes, a plurality of air injection holes are provided on the vertical pipes, and the bottom of the vertical pipes is connected to an air supply pipe, and the air supply pipe is connected to the main pipe.

[0010] In one embodiment of the present invention, an inclined plate is provided in the feeding tower, a plurality of holes are provided on the inclined plate, the inclined plate is fixedly connected to the upper end of the vertical pipe, and the high end of the inclined plate is located at the feeding port of the feeding tower.

[0011] In one embodiment of the present invention, the inner edge of the cover plate is tilted and tilted upward.

[0012] In one embodiment of the present invention, refractory wool is provided between the upper surface of the heat collecting plate and the annular plate, and between the upper surface of the heat collecting plate and the sintering table.

[0013] In one embodiment of the present invention, the jetting direction of each jet hole is arranged downward.

[0014] In one embodiment of the present invention, a gap is left between the push plate and the sintering table; and a plurality of convex points are provided on the inner concave surface of the upper surface of the sintering table.

[0015] In one embodiment of the present invention, a water pipe is coiled around the outer surface of the feed tower.

[0016] The above technical solution of the present invention has the following advantages compared with the prior art:

[0017] 1. The present invention designs a flue gas heat exchange device for preheating the spherical material. When the spherical material is preheated in the feeding tower, in terms of energy conservation and emission reduction, by utilizing the high-temperature flue gas waste heat of the rotary hearth furnace for preheating, energy consumption can be greatly reduced and the recovery rate can be improved. This is in line with the social environment of energy conservation and emission reduction and has good economic and social benefits. In terms of thermal efficiency, preheating the spherical material can reduce external fuel consumption, that is, reduce the supply of heat source and reduce costs. In terms of product quality, preheating can heat the spherical material more evenly to prevent local overheating, thereby improving the final spherical material product quality.

[0018] 2. An exhaust pipe is provided on the top of the feeding tower. The exhaust pipe can extract the excess exhaust gas in the furnace body, so that the main pipe can continuously inject the exhaust gas into the feeding tower, and the exhaust gas discharged from the exhaust pipe can be used to heat water. That is, in this embodiment, the designed flue gas heat exchange device can not only preheat the spherical material, but also use the residual heat to heat water. The two ways of heating water and preheating spherical materials are designed in an integrated manner, and the exhaust gas heat utilization rate is higher, which can better meet the needs of different manufacturers. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to make the contents of the present invention more clearly understood, the present invention is further described in detail below based on specific embodiments of the present invention in conjunction with the accompanying drawings.

[0020] Figure 1 It is a three-dimensional diagram of the coordination between the furnace body and the flue gas heat exchange device in the present invention;

[0021] Figure 2 It is a side view of the furnace body and the flue gas heat exchange device in the present invention;

[0022] Figure 3 It is a three-dimensional diagram of the furnace body of the present invention;

[0023] Figure 4 It is a three-dimensional diagram of the coordination between the sintering table and the feeding tower in the present invention;

[0024] Figure 5 A top view of the sintering table of the present invention;

[0025] Figure 6 It is a three-dimensional diagram of the cooperation between the sintering table and the cover plate in the present invention;

[0026] Figure 7 It is a three-dimensional diagram of the cooperation between the sintering table and the material pushing assembly in the present invention;

[0027] Figure 8 is a three-dimensional diagram of a sintering table in the present invention;

[0028] Fig. 9 is a cross-sectional view of the sintering table of the present invention;

[0029] Fig.10 It is a three-dimensional diagram of the feed tower in the present invention;

[0030] Fig.11 is a three-dimensional diagram of a vertical pipe in the present invention;

[0031] Fig.12 It is a schematic diagram of the cooperation between the vertical pipe and the inclined plate in the present invention.

[0032] In the figure: 1. furnace body; 2. outer lining plate; 3. sintering table; 4. annular plate; 5. heat collecting plate; 6. annular opening; 7. main pipe; 8. feeding tower; 9. spiral blade; 10. notch; 11. loading area; 12. heating area; 13. unloading area; 14. burner; 15. pump body; 16. exhaust pipe; 17. turntable; 18. push plate; 19. cover plate; 20. guide pipe; 21. rotating rod; 22. vertical pipe; 23. air supply pipe; 24. screw feeder; 25. inclined plate; 26. hole; 27. feeding port; 28. water pipe. DETAILED DESCRIPTION

[0033] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments so that those skilled in the art can better understand the present invention and implement it, but the embodiments are not intended to limit the present invention.

[0034] Reference Figure 1 - Fig.10 A flue gas heat exchange device for a rotary hearth furnace comprises a furnace body 1, the furnace body 1 comprises an annular outer lining plate 2, the outer lining plate 2 is composed of some heat-insulating materials to reduce the heat radiation in the furnace body 1, an annular sintering table 3 is arranged in the inner circle of the outer lining plate 2, a heat source is arranged below the sintering table 3, a heat extraction component is arranged in the inner circle of the sintering table 3, the heat extraction component comprises an annular plate 4, an annular heat collecting plate 5 is arranged below the annular plate 4, an annular opening 6 is arranged on the upper end surface of the heat collecting plate 5, an inner plate of the heat collecting plate 5 is opposite to the annular plate 4, an outer plate of the heat collecting plate 5 is opposite to the lower edge of the inner circle of the sintering table 3, and an outer wall of the heat collecting plate 5 is connected to a main pipe 7, the main pipe 7 extends upward to the top of the furnace body 1, and a feeding component is arranged above the furnace body 1;

[0035] The feeding assembly includes a funnel-shaped feeding tower 8, the lower port of the feeding tower 8 is opposite to the feeding area 11 of the furnace body 1, one side of the feeding tower 8 is connected to the main pipe 7, and a spiral blade 9 is also provided at the axial position of the feeding tower 8;

[0036] In this embodiment, from the top view of the sintering table 3, Figure 5 As shown, a notch 10 is provided on the right side of the sintering table 3, and the notch 10 is a discharge port, and the sintered spherical material is discharged from the notch 10. The sintering table 3 is divided into a loading area 11, a heating area 12 and a discharge area 13;

[0037] like Fig. 9 As shown, a cross-sectional view of the sintering table 3 is shown, and a plurality of burners 14 are arranged below the sintering table 3 to provide a heat source, which may be natural gas fuel, furnace gas or blast furnace gas, etc.;

[0038] The spherical material is heated at high temperature on the sintering table 3, and a reduction reaction occurs. Then, the excess heat is extracted through the extraction component. Specifically, a pump body 15 is provided on the main pipe 7, which can generate negative pressure in the main pipe 7 and extract the excess heat on the heat sintering table 3 to the outer wall of the annular plate 4, and then along the fluid heat collecting plate 5 under the annular plate 4, and then extracted by the main pipe 7 to the feeding tower 8; the extracted heat is the waste gas containing heat, and the waste gas is extracted into the feeding tower 8, and the feeding tower 8 contains the spherical material. The waste gas preheats the spherical material and increases the temperature of the spherical material in advance, and then the spiral blade 9 at the bottom of the feeding tower 8 controls the material and feeds it onto the sintering table 3;

[0039] The rotating shaft of the spiral blade 9 passes through the top of the feeding tower 8 upwards, and can be driven by a motor to rotate slowly, so as to control the preheated spherical materials to be smoothly fed into the furnace body 1, so as to avoid the spherical materials from being accumulated in the furnace body 1 and affecting the heating reduction effect;

[0040] In this embodiment, a flue gas heat exchange device is designed to preheat the spherical material and provide another way to reuse the waste gas to meet the needs of different manufacturers. When the spherical material is preheated in the feeding tower 8, in terms of energy saving and emission reduction, by using the high-temperature flue gas waste heat of the rotary hearth furnace for preheating, energy consumption can be greatly reduced and the recovery rate can be improved. This is in line with the social environment of energy saving and emission reduction and has good economic and social benefits.

[0041] In terms of thermal efficiency, preheating the spherical material can reduce external fuel consumption, that is, reduce the supply of heat source and reduce costs;

[0042] In terms of product quality, preheating can heat the spherical material more evenly and prevent local overheating, thereby improving the final spherical material product quality;

[0043] As for the residual heat, it is used to heat water. For example, an exhaust pipe 16 is provided on the top of the feeding tower 8. The exhaust pipe 16 can extract the excess exhaust gas in the furnace body 1, so that the main pipe 7 can continuously inject the exhaust gas into the feeding tower 8, and the exhaust gas discharged from the exhaust pipe 16 can heat the water again. That is, in this embodiment, the designed flue gas heat exchange device can not only preheat the spherical material, but also use the residual heat to heat water. The two ways of heating water and preheating the spherical material are designed in an integrated manner, and the exhaust gas heat utilization rate is higher, which can better meet the needs of different manufacturers.

[0044] Reference Figure 1 - Fig. 9The heat extraction assembly is also provided with a material pushing assembly, which is used to push the spherical material on the sintering table 3, and the material pushing assembly includes a turntable 17 arranged at the center of the sintering table 3, and a plurality of push plates 18 are arranged on the edge of the turntable 17, and the push plates 18 penetrate the annular plate 4 and extend above the sintering table 3, and an arc-shaped cover plate 19 is arranged above the push plates 18, one end of the cover plate 19 extends to the loading area 11 of the furnace body 1, and the other end of the cover plate 19 extends to the unloading area 13 of the furnace body 1;

[0045] A material guide pipe 20 is provided below the notch 10, and the material guide pipe 20 is used for discharging the spherical material;

[0046] The pusher assembly is used to push the spherical materials in the loading area 11 to the heating area 12 and the unloading area 13 in sequence;

[0047] A rotating rod 21 is arranged below the rotating disk 17. The rotating rod 21 is connected to an external rotating driving component, such as a reduction motor. The rotating rod 21 drives the rotating disk 17 to rotate slowly. The rotating disk 17 drives the annular plate 4 and the push plate 18 to rotate synchronously. The spiral blade 9 rotates to control the quantitative feeding of the spherical material in the feeding tower 8 onto the sintering table 3. Then the push plate 18 slowly pushes the quantitative spherical material to the heating zone 12. During the pushing process, the spherical material will also roll up and down. The spherical material is fully in contact with the heat source to ensure the reduction reaction effect. When the push plate 18 pushes the spherical material to the position of the notch 10, the spherical material falls into the guide pipe 20 along the notch 10 and is discharged along the guide pipe 20.

[0048] A cover plate 19 is arranged above the sintering table 3. The cover plate 19 is also made of some thermal insulation materials. The cover plate 19 restricts the flow direction of the heat source so that the heat can flow along the lower surface of the cover plate 19 to the annular plate 4, and then flow downward along the outer surface of the annular plate 4, thereby reducing the amount of heat source flowing upward and fully extracting the heat, thereby improving the utilization rate of the heat.

[0049] Reference Figure 1 - Fig. 9 The upper surface of the sintering table 3 is concave downward, and the lower surface of the sintering table 3 is concave upward; the shape of each push plate 18 is adapted to the concave shape of the upper surface of the sintering table 3;

[0050] The sintering table 3 can be made of refractory bricks. A plurality of small holes are provided on the surface of the sintering table 3 for the flow of heat source, that is, the heat source flows from the lower surface of the sintering table 3 to its upper surface, and heats the spherical material from below, thereby improving the heating effect and reducing the supply of heat source, thus playing a role in saving costs.

[0051] The lower surface of the sintering table 3 is concave upward, which plays a role in guiding the flow of the heat source, so that the heat source can fully flow to the upper surface of the sintering table 3 through the lower hole; and the upper surface of the sintering table 3 is concave downward, which gathers the spherical materials in the sintering table 3, so that the heat source can fully contact with more spherical materials, which is also one of the optimization methods to improve the heating effect of the spherical materials;

[0052] The push plate 18 is shaped so as to be able to smoothly rotate along the concave portion of the upper surface of the sintering table 3 and to reach all the spherical materials in the sintering table 3 , thereby preventing some of the spherical materials from being left on the sintering table 3 .

[0053] Reference Figure 1 - Fig.12 The feed tower 8 is provided with a heat flow dispersion component, and the heat flow dispersion component includes a plurality of vertical pipes 22, a plurality of jet holes are provided on the vertical pipes 22, and the bottom of the vertical pipes 22 is connected to an air supply pipe 23, and the air supply pipe 23 is connected to the main pipe 7;

[0054] A screw feeder 24 is provided at the top of the feeding tower 8, which can continuously convey the pressed spherical material into the feeding tower 8;

[0055] A vertical pipe 22 is arranged in the feeding tower 8, and the vertical pipe 22 is connected to the main pipe 7 through the air supply pipe 23. The exhaust gas is injected into the vertical pipe 22 and discharged from the air jet hole. The exhaust gas is dispersed into the feeding tower 8, so that the heat can be evenly distributed inside each feeding tower 8, and the spherical material is preheated more evenly.

[0056] 5. A rotary hearth furnace flue gas heat exchange device according to claim 4, characterized in that: an inclined plate 25 is provided in the feeding tower 8, a plurality of holes 26 are provided on the inclined plate 25, the inclined plate 25 is fixedly connected to the upper end of the vertical pipe 22, and the upper end of the inclined plate 25 is located at the feeding port 27 of the feeding tower 8;

[0057] The inclined plate 25 is provided to disperse the spherical materials into the feeding tower 8. The outlet of the screw feeder 24 is provided at the feeding port 27 of the feeding tower 8. The screw feeder 24 feeds the spherical materials onto the inclined plate 25 and flows along the inclined angle of the inclined plate 25. During the flow, the spherical materials fall along the holes 26. The spherical materials are dispersed and fall into the feeding tower 8. The heat of the exhaust gas fully contacts the spherical materials, thereby preventing the spherical materials from falling into a certain corner of the feeding tower 8, resulting in the heat discharged from some vertical pipes 22 being unable to act on the spherical materials.

[0058] Reference Figure 6 and Fig. 9The inner edge of the cover plate 19 is tilted and tilted upward; after the heat source heats the spherical material, the excess heat source flows along the lower surface of the cover plate 19, and the inner edge of the cover plate 19 is tilted and tilted upward, increasing the gap between the inner edge of the cover plate 19 and the upper edge of the inner circle of the sintering table 3, and is used to increase the outlet for the flow of the heat source, so that the excess heat can be discharged in time, reducing the residence time of the heat source, and reducing the amount of heat source through thermal radiation.

[0059] Reference Fig. 9 , refractory wool is provided between the upper surface of the heat collecting plate 5 and the annular plate 4, and between the upper surface of the heat collecting plate 5 and the sintering table 3;

[0060] The heat collecting plate 5 is in a negative pressure state, which will draw away the heat source on the sintering table 3. At the same time, the heat collecting plate 5 and the annular plate 4 are connected for relative rotation, and the relative rotation between the heat collecting plate 5 and the annular plate 4 needs to be ensured, while isolating foreign matter from being drawn into the heat collecting plate 5. Therefore, refractory wool is arranged on the upper edges of the inner plate and the outer plate of the heat collecting plate 5 to seal the gap between the heat collecting plate 5 and the annular plate 4, as well as the gap between the heat collecting plate 5 and the sintering table 3. The first is to ensure that there is a good negative pressure environment inside the heat collecting plate 5, and the second is to reduce the amount of foreign matter flowing into the heat collecting plate 5 along the gap.

[0061] Reference Fig.12 After the spherical material is put into the feeding tower 8, foreign particles will fall off the surface of the spherical material, and the jet direction design of the jet hole can prevent the foreign particles falling off the spherical material from clogging the jet hole.

[0062] Reference Fig. 9 , a gap is left between the push plate 18 and the sintering table 3; the concave surface of the upper surface of the sintering table 3 is provided with a plurality of convex points;

[0063] The gap between the push plate 18 and the sintering table 3 is smaller than the diameter of the spherical material, ensuring that the push plate 18 can touch each spherical material, and a protrusion is set on the sintering table 3, which will block the spherical material, causing the spherical material to roll, and the heat source is fully in contact with the spherical material, further improving the high-temperature heating effect of the spherical material.

[0064] Reference Fig.10 A water pipe 28 is coiled on the outer surface of the feeding tower 8; the water pipe 28 is laid on the outer surface of the feeding tower 8, and cold water is continuously supplied to the water pipe 28. The temperature of the feeding tower 8 itself is transferred to the water pipe 28 and absorbed by the water, thereby reducing the amount of heat source radiation waste in the feeding tower 8.

[0065] Working principle:

[0066] A plurality of burners 14 are ignited, and the discharged heat source passes through the small holes on the sintering table 3 to heat and reduce the spherical materials on the sintering table 3. Then, the excess heat flows along the lower surface of the cover plate 19 to the outer surface of the annular plate 4, and flows downward to the heat collecting plate 5, and then flows along the main pipe 7 to the feeding tower 8. The heat source is discharged from the jet holes on the plurality of vertical pipes 22, and the heat in the exhaust gas heats the spherical materials. During the heating process, the spherical materials are pushed downward by the spiral blades 9, and the spherical materials fall onto the sintering table 3. At this time, the spherical materials discharged are preheated spherical materials. At the same time, the push plate 18 rotates and pushes the spherical materials from the loading area 11 to the heating area 12 and the unloading area 13 one by one. When the spherical materials are pushed to the unloading area 13, the high-temperature heating and reduction process of the spherical materials is completed, and the spherical materials fall along the notch 10 into the guide pipe 20.

[0067] Obviously, the above embodiments are merely examples for clear explanation and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived from these are still within the protection scope of the invention.

Claims

1. A rotary hearth furnace flue gas heat exchange device, characterized in that: The furnace body (1) comprises a furnace body (1), wherein the furnace body (1) comprises an annular outer lining plate (2), an annular sintering table (3) is arranged on the inner circle of the outer lining plate (2), a heat source is arranged below the sintering table (3), an inner circle of the sintering table (3) is provided with a heat extraction component, the heat extraction component comprises an annular plate (4), an annular heat collecting plate (5) is arranged below the annular plate (4), an annular opening (6) is provided on the upper end surface of the heat collecting plate (5), an inner side plate of the heat collecting plate (5) is opposite to the annular plate (4), an outer side plate of the heat collecting plate (5) is opposite to the lower edge of the inner circle of the sintering table (3), and an outer wall of the heat collecting plate (5) is connected to a main pipe (7), the main pipe (7) extends upward to the top of the furnace body (1), and a feeding component is arranged above the furnace body (1); The feeding assembly comprises a funnel-shaped feeding tower (8), wherein a lower port in the feeding tower (8) is opposite to a feeding area (11) of the furnace body (1), one side of the feeding tower (8) is connected to a main pipe (7), and a spiral blade (9) is also provided at an axial position in the feeding tower (8).

2. A rotary hearth furnace flue gas heat exchange device according to claim 1, characterized in that: The heat extraction assembly is also provided with a material pushing assembly, which is used to push the spherical material on the sintering table (3), and the material pushing assembly includes a turntable (17) arranged at the center of the sintering table (3), and a plurality of push plates (18) are provided on the edge of the turntable (17), and the push plates (18) penetrate the annular plate (4) and extend above the sintering table (3), and an arc-shaped cover plate (19) is provided above the push plates (18), one end of the cover plate (19) extends to the loading area (11) of the furnace body (1), and the other end of the cover plate (19) extends to the unloading area (13) of the furnace body (1).

3. A rotary hearth furnace flue gas heat exchange device according to claim 2, characterized in that: The upper surface of the sintering table (3) is concave downward, and the lower surface of the sintering table (3) is concave upward; the shape of each push plate (18) is adapted to the concave shape of the upper surface of the sintering table (3).

4. The rotary hearth furnace flue gas heat exchange device according to claim 1, characterized in that: The feed tower (8) is provided with a heat flow dispersion component, and the heat flow dispersion component includes a plurality of vertical pipes (22), a plurality of air injection holes are provided on the vertical pipes (22), the bottom of the vertical pipes (22) is connected to an air supply pipe (23), and the air supply pipe (23) is connected to the main pipe (7).

5. The rotary hearth furnace flue gas heat exchange device according to claim 4, characterized in that: The feed tower (8) is provided with an inclined plate (25) on which a plurality of holes (26) are formed. The inclined plate (25) is fixedly connected to the upper end of the vertical pipe (22), and the upper end of the inclined plate (25) is located at the feeding port (27) of the feed tower (8).

6. A rotary hearth furnace flue gas heat exchange device according to claim 2, characterized in that: The inner edge of the cover plate (19) is tilted and tilted upward.

7. The rotary hearth furnace flue gas heat exchange device according to claim 1, characterized in that: Refractory wool is provided between the upper surface of the heat collecting plate (5) and the annular plate (4), and between the upper surface of the heat collecting plate (5) and the sintering table (3).

8. The rotary hearth furnace flue gas heat exchange device according to claim 4, characterized in that: The jetting direction of each jet hole is arranged downward.

9. The rotary hearth furnace flue gas heat exchange device according to claim 3, characterized in that: A gap is left between the push plate (18) and the sintering table (3); and a plurality of convex points are provided on the inner concave surface of the upper surface of the sintering table (3).

10. The rotary hearth furnace flue gas heat exchange device according to claim 5, characterized in that: A water pipe (28) is coiled around the outer surface of the feed tower (8).

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