Crossed air supply flue gas circulation system for magnetite belt roaster

Abstract

The application provides a cross-provided flue gas circulation system for a magnetite belt roaster, which comprises a belt roaster body, the belt roaster body comprises a blast drying section, a preheating section, a first cooling section and a second cooling section arranged along the material flow advancing direction; further comprising a first and a second flue gas circulation regenerative air pipe, the blast drying section is communicated with the first cooling section through the first flue gas circulation regenerative air pipe, and hot air is introduced into the first cooling section; the preheating section is communicated with the second cooling section through the second flue gas circulation regenerative air pipe, and hot air is introduced into the second cooling section. The blast drying section is communicated with the first cooling section through the first flue gas circulation regenerative air pipe, and the preheating section is communicated with the second cooling section through the second flue gas circulation regenerative air pipe, so that the heat waste caused by direct flue gas discharge is reduced by realizing the recycling of the hot waste gas of the blast drying section and the preheating section. By arranging the first and the second cross-provided air pipes, the air supply form is adjusted, and the heat distribution is optimized.

Description

Technical Field

[0001] This application belongs to the field of pellet production technology in the iron and steel metallurgical industry, and specifically relates to a cross-supply flue gas circulation system suitable for magnetite belt roasters. Background Technology

[0002] In the pellet production process, the belt roaster is one of the main production equipment for iron ore pellets. The belt roaster is divided into four sections along the material flow direction: blower drying section, exhaust drying section, preheating section, roasting section, homogenization section, and cooling section.

[0003] In existing belt roasters, the flue gas from the blower drying section, exhaust drying section, and preheating section all need to be discharged to the outside. The heat in the flue gas has recovery value, resulting in energy waste.

[0004] In existing belt roasting machines, there is no partition between the cooling section and the homogenizing section. The hot air displaced at the very front of the cooling section has the highest temperature and directly enters the homogenizing section. The hot air exiting the middle section of the cooling section enters the roasting section, resulting in an unreasonable heat distribution. Utility Model Content

[0005] Therefore, the purpose of this application is to solve at least one of the above-mentioned technical problems and provide a cross-supply flue gas circulation system suitable for a magnetite belt roaster, including a belt roaster body, wherein the belt roaster body includes a blower drying section, a preheating section, a first cooling section and a second cooling section arranged along the material flow direction; the cross-supply flue gas circulation system suitable for a magnetite belt roaster further includes a first flue gas circulation reheating air duct and a second flue gas circulation reheating air duct, wherein the blower drying section is connected to the first cooling section through the first flue gas circulation reheating air duct to introduce hot air into the first cooling section, and the preheating section is connected to the second cooling section through the second flue gas circulation reheating air duct to introduce hot air into the second cooling section.

[0006] Optionally, the cross-flow flue gas circulation system for a magnetite belt roaster includes a roasting section and a homogenizing section arranged along the material flow direction, wherein the roasting section and the homogenizing section are located between the preheating section and the first cooling section; the cross-flow flue gas circulation system for a magnetite belt roaster further includes a first cross-flow pipe and a second cross-flow pipe, wherein the first cross-flow pipe is connected to the first cooling section and the roasting section respectively, and the second cross-flow pipe is connected to the second cooling section and the homogenizing section respectively.

[0007] Optionally, the first flue gas recirculation reheat air duct is equipped with a first hot air valve and a first cold air valve.

[0008] Optionally, a second hot air valve and a second cold air valve are provided on the second flue gas recirculation reheat air duct.

[0009] Optionally, the blower drying section includes a blower drying section hood, the first flue gas circulation reheat air duct is connected to the blower drying section hood, a furnace hood dust removal system and a flue gas dehydration system are sequentially arranged on the first flue gas circulation reheat air duct along the flow direction, and a first cooling fan is arranged on the first flue gas circulation reheat air duct.

[0010] Optionally, the preheating section includes a preheating section air box, the second flue gas recirculation reheating air duct is connected to the preheating section air box, and the second flue gas recirculation reheating air duct is equipped with a flue gas recirculation dust removal system and a second cooling fan.

[0011] Optionally, a roasting section cover is provided at the end of the roasting section, and combustion chambers are provided on both sides of the roasting section cover. The roasting section also includes a roasting section air box. The outlet of the first cross air supply pipe is connected to the combustion chamber so that the exhaust gas enters the roasting section cover through the combustion chamber, passes through the material layer from top to bottom, and enters the roasting section air box.

[0012] Optionally, the heat equalization section includes a heat equalization section shroud and a heat equalization section air box, and the outlet of the second cross air supply pipe is connected to the heat equalization section shroud so that the discharged gas passes through the material layer from top to bottom and enters the heat equalization section air box.

[0013] Optionally, a first partition wall is provided between the heat dissipation section and the first cooling section.

[0014] Optionally, a second partition wall is provided between the first cooling section and the second cooling section.

[0015] Beneficial effects:

[0016] The present invention provides a cross-supply flue gas circulation system suitable for a magnetite belt roaster. By setting up a first and a second flue gas circulation reheat air duct, and connecting the blower drying section to the first cooling section via the first duct, and the preheating section to the second cooling section via the second duct, the system achieves the recovery and utilization of hot waste gas from the blower drying and preheating sections. This reduces heat waste caused by direct flue gas discharge and energy consumption. Simultaneously, by setting up the first and second cross-supply air ducts, the air supply pattern from the first and second cooling sections to the roasting and homogenizing sections is adjusted, optimizing heat distribution and improving the overall thermal efficiency of the system. By circulating the hot waste gas from the blower drying section to the first cooling section and the hot waste gas from the preheating section to the second cooling section, the impact of reduced oxygen content on the overall production process is minimized. Attached Figure Description

[0017] Figure 1 This is a system schematic diagram of a cross-flow flue gas circulation system for a magnetite belt roaster, according to an embodiment of this application.

[0018] The reference numerals in the attached figures are as follows:

[0019] 1. Blow-drying section; 2. Blow-drying section hood; 3. First flue gas recirculation reheat air duct; 4. Furnace hood dust removal system; 5. Flue gas dehydration system; 6. First hot air valve; 7. First cold air valve; 8. Preheating section; 9. Preheating section air box; 10. Flue gas recirculation dust removal system; 11. Second flue gas recirculation reheat air duct; 12. Second hot air valve; 13. Second cold air valve; 14. First cooling fan; 15. Second cooling fan; 16. First cross air supply duct; 17. Second cross air supply duct; 18. First partition wall; 19. Second partition wall; 20. Combustion chamber; 21. Drying section; 22. Calcination section; 23. Soaking section; 24. First cooling section; 25. Second cooling section; 26. Third cooling section. Detailed Implementation

[0020] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0021] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0022] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0023] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0024] like Figure 1 As shown in the embodiments of this application, a cross-supply flue gas circulation system suitable for a magnetite belt roaster is provided, including a belt roaster body, the belt roaster body including a blower drying section 1, a preheating section 8, a first cooling section 24 and a second cooling section 25 arranged along the material flow direction.

[0025] The cross-supply flue gas circulation system applicable to magnetite belt roaster also includes a first flue gas circulation reheat air duct 3 and a second flue gas circulation reheat air duct 11. The blower drying section 1 is connected to the first cooling section 24 through the first flue gas circulation reheat air duct 3 to introduce hot air into the first cooling section 24. The preheating section 8 is connected to the second cooling section 25 through the second flue gas circulation reheat air duct 11 to introduce hot air into the second cooling section 25.

[0026] By setting up a first flue gas recirculation reheat air duct 3 and a second flue gas recirculation reheat air duct 11, and connecting the blower drying section 1 to the first cooling section 24 via the first flue gas recirculation reheat air duct 3, and connecting the preheating section 8 to the second cooling section 25 via the second flue gas recirculation reheat air duct 11, the hot waste gas from the blower drying section 1 and the preheating section 8 is recycled and utilized, reducing heat waste caused by direct exhaust of flue gas and reducing energy consumption. Simultaneously, by adjusting the air supply pattern from the first cooling section 24 and the second cooling section 25 to the roasting section and the homogenizing section, heat distribution is optimized, and the overall thermal efficiency of the system is improved.

[0027] By circulating the hot exhaust gas from the blast drying section 1 to the first cooling section 24 and the hot exhaust gas from the preheating section 8 to the second cooling section 25, the cross-supply flue gas circulation system suitable for magnetite belt roasters can be better met in the production of magnetite using magnetite as raw material, thus avoiding the impact of reduced oxygen content on the entire production process.

[0028] By setting up a first flue gas recirculation hot air duct 3, the hot waste gas generated in the blower drying section 1 is introduced into the first cooling section 24, which can better utilize thermal energy and improve the overall thermal efficiency of the system. Replacing the ambient temperature air blown in by the cooling fan with the hot waste gas from the blower drying section 1 increases the outlet air temperature of the cooling section, providing more heat to the roasting section 22, saving fuel consumption in the roasting section 22, and reducing the amount of flue gas discharged from the system by utilizing the waste heat of the flue gas.

[0029] By setting up a second flue gas recirculation and reheating air duct 11, the hot exhaust gas from the preheating section 8 is introduced into the second cooling section 25, avoiding heat loss caused by direct emission of flue gas from the preheating section 8, and further improving energy utilization.

[0030] Specifically, the flue gas from the blower drying section 1 is directionally transported to the first cooling section 24, and the flue gas from the preheating section 8 is directionally transported to the second cooling section 25, making the hot air source for different areas of the cooling section more reasonable.

[0031] The material flow direction refers to the direction of material movement on the cross-flow flue gas circulation system applicable to magnetite belt roasters during operation.

[0032] The cross-flow flue gas circulation system suitable for magnetite belt roaster includes a roasting section 22 and a homogenizing section 23 arranged along the material flow direction, with the roasting section 22 and homogenizing section 23 located between the preheating section 8 and the first cooling section 24.

[0033] The cross-air supply flue gas circulation system applicable to magnetite belt roaster also includes a first cross-air supply pipe 16 and a second cross-air supply pipe 17. The first cross-air supply pipe 16 is connected to the first cooling section 24 and the roasting section 22, respectively, and the second cross-air supply pipe 17 is connected to the second cooling section 25 and the heat soaking section 23, respectively.

[0034] By setting up the first cross air supply pipe 16 and the second cross air supply pipe 17, the air supply pattern from the first cooling section and the second cooling section to the roasting section and the homogenization section is adjusted, the heat distribution is optimized, and the overall thermal efficiency of the system is improved.

[0035] By setting up a first cross-air supply duct 16 and a second cross-air supply duct 17, hot air from the first cooling section 24 is introduced into the combustion chamber 20 of the roasting section 22 through the first cross-air supply duct 16, shortening the hot air transmission path, reducing heat loss, providing a high-temperature heat source for the roasting section 22, and reducing fuel consumption. Hot air from the second cooling section 25 is introduced into the heat equalization section 23 through the second cross-air supply duct 17, further optimizing heat distribution.

[0036] By using the hot exhaust gas from the preheating section 8 to partially replace the ambient air that originally needed to be blown in by the cooling fan, the outlet air temperature of the cooling section can be increased, providing more heat to the heat equalization section 23. Utilizing the waste heat of the flue gas can also reduce the amount of flue gas discharged from the system.

[0037] In this process, by allowing the hot exhaust gas from the blower drying section 1 and the preheating section 8 to enter the first cooling section 24 and the second cooling section 25, the temperature of the hot air at the outlet of the first cooling section 24 and the second cooling section 25 is increased, providing a higher quality heat source for the subsequent roasting section 22 and the homogenizing section 23.

[0038] The roasting machine body also includes a drying section 21, which is located between the blower drying section 1 and the preheating section 8.

[0039] The roasting machine body also includes a third cooling section 26, which is located on the side of the material flow direction of the second cooling section 25.

[0040] Specifically, in the calcining machine body, the blower drying section 1, the desiccation section 21, the preheating section 8, the calcining section 22, the homogenization section 23, the first cooling section 24, the second cooling section 25, and the third cooling section 26 are arranged sequentially along the material flow direction.

[0041] The inlet of the first cross air supply pipe 16 is connected to the first cooling section 24, and the outlet of the first cross air supply pipe 16 is connected to the roasting section 22, so that the high-temperature gas in the first cooling section 24 is discharged to the roasting section 22 via the first cross air supply pipe 16.

[0042] The inlet of the second cross air supply pipe 17 is connected to the second cooling section 25, and the outlet of the second cross air supply pipe 17 is connected to the heat exchange section 23, so that the high-temperature gas in the second cooling section 25 is discharged to the heat exchange section 23 via the second cross air supply pipe 17.

[0043] The first flue gas recirculation reheat air duct 3 is equipped with a first hot air valve 6 and a first cold air valve 7.

[0044] By installing a first hot air valve 6 on the first flue gas recirculation hot air duct 3, the flow rate of hot air in the first flue gas recirculation hot air duct 3 can be adjusted. By installing a first cold air valve 7, relatively low-temperature gas can be introduced into the first flue gas recirculation hot air duct 3, thereby reducing the gas temperature in the first flue gas recirculation hot air duct 3. Through the cooperation of the first hot air valve 6 and the first cold air valve 7, the temperature control requirements of the roasting section 22 can be met.

[0045] Among them, the first hot air valve 6 and the first cold air valve 7 are regulating valves that can adjust the fluid flow rate.

[0046] The first cooling air valve 7 is connected at one end to the first flue gas circulation reheat air duct 3 and at the other end to the outside air, so that the relatively low-temperature outside ambient air can be introduced into the first flue gas circulation reheat air duct 3 to achieve cooling.

[0047] In the first flue gas recirculation hot air duct 3, the first hot air valve 6 is located upstream of the first cold air valve 7 in the direction of gas flow, which can achieve a better mixing effect for the hot air.

[0048] The second flue gas recirculation reheat air duct 11 is equipped with a second hot air valve 12 and a second cold air valve 13.

[0049] By installing a second hot air valve 12 on the second flue gas recirculation hot air duct 11, the flow rate of hot air in the second flue gas recirculation hot air duct 11 can be adjusted. By installing a second cold air valve 13, relatively low-temperature gas can be introduced into the second flue gas recirculation hot air duct 11, thereby reducing the gas temperature in the second flue gas recirculation hot air duct 11. Through the cooperation of the second hot air valve 12 and the second cold air valve 13, the temperature control requirements of the heat soaking section 23 can be met, and there is no need to add a burner to the heat soaking section 23.

[0050] During the pellet preparation process, the flue gas from the preheating section 8 can be introduced into the second cooling section 25 through the second flue gas recirculation and reheating air duct 11. The second cooling air valve 13 can introduce relatively low-temperature gas into the second flue gas recirculation and reheating air duct 11. The relatively low-temperature gas and the flue gas from the preheating section 8 can enter the second cooling section 25 together, which can utilize the waste heat of the flue gas while ensuring the cooling effect and reducing the amount of flue gas discharged from the system.

[0051] The second hot air valve 12 and the second cold air valve 13 are regulating valves capable of adjusting fluid flow.

[0052] The second cooling air valve 13 is connected at one end to the second flue gas circulation reheat air duct 11 and at the other end to the outside air, so that the relatively low temperature outside ambient air can be introduced into the second flue gas circulation reheat air duct 11 to achieve cooling.

[0053] In the second flue gas recirculation hot air duct 11, the second hot air valve 12 is located upstream of the second cold air valve 13 in the direction of gas flow, which can achieve a better mixing effect for the hot air.

[0054] It is understandable that the material temperature in the second cooling section 25 can reach over 1000℃, while the flue gas temperature in the preheating section 8, which is led out through the second flue gas recirculation hot air duct 11, is around 300℃. The temperature of the mixed gas formed by the flue gas and the outside air will be even lower, with a significant difference from the material temperature. Therefore, using the mixture of flue gas and outside air as the air source for the second cooling section 25 can ensure the cooling effect and reduce the amount of flue gas discharged.

[0055] The blower drying section 1 includes a blower drying section hood 2, a first flue gas circulation reheat air duct 3 connected to the blower drying section hood 2, a furnace hood dust removal system 4 and a flue gas dehydration system 5 sequentially arranged along the flow direction on the first flue gas circulation reheat air duct 3, and a first cooling fan 14 arranged on the first flue gas circulation reheat air duct 3.

[0056] By connecting the first flue gas recirculation reheat air duct 3 to the upper cover 2 of the blower drying section, the hot waste gas generated in the blower drying section 1 can be introduced into the first flue gas recirculation reheat air duct 3, realizing the directional recovery of waste heat from the flue gas in the blower drying section 1, and transporting the waste heat to the first cooling section 24 to provide preheated hot air for the first cooling section 24. This optimizes the heat distribution of the cross-supply flue gas circulation system suitable for magnetite belt roasters and improves the overall thermal efficiency of the system.

[0057] By setting up a furnace hood dust removal system 4 and a flue gas dehydration system 5, the flue gas can be purified, preventing dust and moisture from entering the first cooling section 24 and affecting the process. The first cooling fan 14 set on the first flue gas circulation reheat air duct 3 provides power for flue gas circulation, ensuring stable delivery of hot air, realizing the recovery and utilization of waste heat from the flue gas in the blower drying section 1, reducing energy waste and improving the system's thermal efficiency.

[0058] The preheating section 8 includes a preheating section air box 9. The second flue gas circulation reheating air duct 11 is connected to the preheating section air box 9. The second flue gas circulation reheating air duct 11 is equipped with a flue gas circulation dust removal system 10 and a second cooling fan 15.

[0059] By connecting the second flue gas recirculation reheat air duct 11 to the preheating section air box 9, the hot waste gas collected by the preheating section air box 9 can be introduced into the second flue gas recirculation reheat air duct 11, thereby realizing the directional recovery of waste heat from the flue gas in the preheating section 8 and avoiding the waste of heat caused by direct emission.

[0060] By setting up a flue gas circulation dust removal system 10, the dust in the flue gas can be purified, preventing the dust from entering the second cooling section 25 and subsequent process steps, which could affect equipment operation or pellet roasting quality.

[0061] By installing a second cooling fan 15 on the second flue gas recirculation hot air duct 11, power is provided for flue gas circulation, ensuring that the hot exhaust gas from the preheating section 8 is stably delivered to the second cooling section 25, optimizing the hot air supply to the cooling section, and improving the system's heat utilization rate and process stability.

[0062] The roasting section 22 is provided with a roasting section cover at the end, and combustion chambers 20 are provided on both sides of the roasting section cover. The roasting section 22 also includes a roasting section air box. The outlet of the first cross air supply pipe 16 is connected to the combustion chamber 20 so that the exhaust gas enters the roasting section cover through the combustion chamber 20 and passes through the material layer from top to bottom and enters the roasting section air box.

[0063] In this technical solution, a connection point for the first cross-flow air supply duct 16 is further provided. The outlet of the first cross-flow air supply duct 16 is connected to the combustion chamber 20, which can further improve the utilization efficiency of waste heat and promote combustion in the terminal combustion chamber 20. Furthermore, the hot air delivered by the first cooling section 24 through the first cross-flow air supply duct 16 is heated in the combustion chamber 20 and then enters the upper cover of the roasting section. It passes through the material layer from top to bottom and enters the roasting section air box, achieving full contact between the high-temperature hot air and the material layer of the roasting section 22. This provides a stable high-temperature heat source for pellet roasting, shortens the roasting time, and reduces fuel consumption.

[0064] The first cross air supply pipe 16 directly connects the first cooling section 24 to the combustion chamber 20 at the end of the roasting section 22, resulting in a shorter path, less heat loss, and more efficient air supply.

[0065] The heat equalization section 23 includes a heat equalization section shroud and a heat equalization section air box. The outlet of the second cross air supply pipe 17 is connected to the heat equalization section shroud so that the discharged gas passes through the material layer from top to bottom and enters the heat equalization section air box.

[0066] By connecting the outlet of the second cross air supply pipe 17 to the upper cover of the heat homogenization section, the hot air delivered by the second cooling section 25 is directly introduced into the upper cover of the heat homogenization section through the second cross air supply pipe 17. It passes through the material layer from top to bottom to achieve uniform heat conduction, ensuring that the pellets obtain stable and continuous heat in the heat homogenization section 23, avoiding the problem of uneven temperature caused by the dispersion of hot air path, and improving the uniformity of pellet structure and roasting quality.

[0067] The hot air from the outlet of the first cooling section 24 is introduced into the combustion chamber 20 at the end of the roasting section 22 through the first cross air supply pipe 16, and the hot air from the outlet of the second cooling section 25 is introduced into the heat equalization section 23 through the second cross air supply pipe 17, so as to achieve reasonable air supply through cross air supply.

[0068] A first partition wall 18 is provided between the heat dissipation section 23 and the first cooling section 24. A second partition wall 19 is provided between the first cooling section 24 and the second cooling section 25.

[0069] By arranging the first partition wall 18 between the heat-spreading section 23 and the first cooling section 24, the second partition wall 19 can block the area outside the material conveying path, thereby reducing the escape of heat energy from the heat-spreading section 23 to the first cooling section 24 and further reducing energy consumption.

[0070] By setting up the second partition wall 19, the area outside the material conveying path can be blocked, thereby suppressing the heat exchange between the first cooling section 24 and the second cooling section 25, which can further improve the cooling efficiency.

[0071] It will be readily understood by those skilled in the art that the aforementioned advantageous methods can be freely combined and superimposed without conflict.

[0072] The above are merely preferred embodiments of this application and are not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application. The above are merely preferred embodiments of this application. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of this application, and these improvements and modifications should also be considered within the protection scope of this application.

Claims

1. A cross-flow flue gas recirculation system suitable for a magnetite belt roaster, characterized in that, Includes a belt roaster body, which includes a blower drying section (1), a preheating section (8), a first cooling section (24), and a second cooling section (25) arranged along the material flow direction; The cross-flow flue gas circulation system applicable to magnetite belt roaster further includes a first flue gas circulation reheat air duct (3) and a second flue gas circulation reheat air duct (11). The blower drying section (1) is connected to the first cooling section (24) through the first flue gas circulation reheat air duct (3) to introduce hot air into the first cooling section (24). The preheating section (8) is connected to the second cooling section (25) through the second flue gas circulation reheat air duct (11) to introduce hot air into the second cooling section (25).

2. The cross-flow flue gas circulation system for a magnetite belt roaster according to claim 1, characterized in that, The cross-flow flue gas circulation system applicable to magnetite belt roaster includes a roasting section (22) and a homogenizing section (23) arranged along the material flow direction, wherein the roasting section (22) and the homogenizing section (23) are located between the preheating section (8) and the first cooling section (24). The cross-air supply flue gas circulation system applicable to magnetite belt roaster further includes a first cross-air supply pipe (16) and a second cross-air supply pipe (17). The first cross-air supply pipe (16) is connected to the first cooling section (24) and the roasting section (22) respectively, and the second cross-air supply pipe (17) is connected to the second cooling section (25) and the heat soaking section (23) respectively.

3. The cross-flow flue gas circulation system for a magnetite belt roaster according to claim 1, characterized in that, The first flue gas circulation reheat air duct (3) is equipped with a first heat exchange air valve (6) and a first cold air exchange air valve (7).

4. The cross-flow flue gas circulation system for magnetite belt roasters according to claim 1, characterized in that, The second flue gas circulation reheat air duct (11) is equipped with a second hot air valve (12) and a second cold air valve (13).

5. The cross-flow flue gas circulation system for a magnetite belt roaster according to claim 1, characterized in that, The blower drying section (1) includes a blower drying section hood (2), the first flue gas circulation reheat air duct (3) is connected to the blower drying section hood (2), the first flue gas circulation reheat air duct (3) is provided with a furnace hood dust removal system (4) and a flue gas dehydration system (5) in sequence along the flow direction, and the first flue gas circulation reheat air duct (3) is provided with a first cooling fan (14).

6. The cross-flow flue gas circulation system for a magnetite belt roaster according to claim 1, characterized in that, The preheating section (8) includes a preheating section air box (9), and the second flue gas circulation reheating air duct (11) is connected to the preheating section air box (9). The second flue gas circulation reheating air duct (11) is equipped with a flue gas circulation dust removal system (10) and a second cooling fan (15).

7. The cross-flow flue gas circulation system for a magnetite belt roaster according to claim 2, characterized in that, The roasting section (22) is provided with a roasting section cover at its end. Combustion chambers (20) are provided on both sides of the roasting section cover. The roasting section (22) also includes a roasting section air box. The outlet of the first cross air supply pipe (16) is connected to the combustion chamber (20) so that the exhaust gas enters the roasting section cover through the combustion chamber (20), passes through the material layer from top to bottom, and enters the roasting section air box.

8. The cross-flow flue gas circulation system for a magnetite belt roaster according to claim 2, characterized in that, The heat equalization section (23) includes a heat equalization section cover and a heat equalization section air box. The outlet of the second cross air supply pipe (17) is connected to the heat equalization section cover so that the discharged gas passes through the material layer from top to bottom and enters the heat equalization section air box.

9. The cross-flow flue gas circulation system for a magnetite belt roaster according to claim 2, characterized in that, A first partition wall (18) is provided between the heat dissipation section (23) and the first cooling section (24).

10. The cross-flow flue gas circulation system for a magnetite belt roaster according to claim 1, characterized in that, A second partition wall (19) is provided between the first cooling section (24) and the second cooling section (25).

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