Carbon thermal reduction pellet roasting system

Abstract

The application discloses a carbon heat reduction pellet roasting system and relates to the technical field of metallurgical pellet roasting. The system comprises a plate chain type drying device, a self-flow type roaster, a slow cooling device and a waste heat utilization pipeline. A preheating chamber, a roasting chamber and a cooling chamber are arranged in the furnace body of the self-flow type roaster from top to bottom, a pellet channel penetrates through the chambers, and a heat source is arranged in the roasting chamber. The slow cooling device comprises a sealed conveying device and a plurality of slow cooling tanks provided with heat exchange members. The waste heat utilization pipeline sends the airflow discharged by the drying mechanism into the cooling chamber, sends the hot air discharged by the cooling chamber into the preheating chamber, and sends the hot air discharged by the preheating chamber into the drying mechanism. The application enables the pellets to continuously complete drying, preheating, roasting, cooling and closed slow cooling, and reduces heat loss and pellet oxidation in the slow cooling process through step-by-step circulation of the airflow.

Description

Technical Field

[0001] This invention relates to the field of metallurgical pellet roasting equipment technology, specifically to a carbothermic reduction pellet roasting system. Background Technology

[0002] The carbothermal reduction pellet roasting system belongs to the field of metallurgical pellet production equipment technology. It is mainly used to dry, preheat, roast and cool carbon-containing green pellets in sequence, so that the pellets can complete the consolidation and reduction reaction.

[0003] Currently, pellet roasting is typically accomplished by combining drying and roasting equipment, followed by cooling equipment to lower the temperature of the roasted pellets. To improve thermal energy utilization, some equipment has been modified to address this issue. For example, Chinese utility model patent CN220450262U provides a sintering machine-vertical furnace pellet roasting system. This system uses a sintering machine to dry and preheat the pellets, and completes roasting, homogenization, and cooling within the vertical furnace. Simultaneously, a regenerative air system utilizes the waste heat from the process exhaust gas for pellet drying and preheating.

[0004] However, the drying, preheating and roasting processes of the above system are separated into different equipment, and the material transfer and hot air conveying paths are long, resulting in heat loss. At the same time, the system does not have a structure for isolating air conveying and slow cooling of the pellets, making it difficult to reduce the re-oxidation of carbothermic reduction pellets during the cooling process after exiting the furnace. Summary of the Invention

[0005] Therefore, the present invention proposes a carbothermic reduction pellet roasting system, which can at least partially solve the technical problems mentioned in the background art.

[0006] The technical solution of the present invention is as follows:

[0007] A carbothermic reduction pellet roasting system includes a plate chain dryer, a self-flowing roaster, a slow cooling device, and a waste heat utilization pipeline.

[0008] The plate chain drying device includes a conveying mechanism for conveying pellets and a drying mechanism for drying the pellets, wherein the output end of the conveying mechanism is connected to the feed end of the gravity-flow calciner;

[0009] The self-flowing calciner includes a furnace body and a pellet channel disposed within the furnace body. The inner cavity of the furnace body is sequentially divided into a preheating chamber, a calcining chamber, and a cooling chamber along the top-to-bottom direction. The pellet channel passes through the preheating chamber, the calcining chamber, and the cooling chamber along the height direction of the furnace body. A heat source for heating the pellets is provided in the calcining chamber.

[0010] The slow cooling device is located at the discharge end of the self-flowing calciner and includes a sealed conveying device and several slow cooling tanks. The inlet end of the sealed conveying device is connected to the discharge end of the cooling chamber, and the discharge end is connected to the inlet end of each slow cooling tank. Each slow cooling tank is provided with a heat exchange component for indirect heat exchange of the pellets.

[0011] The waste heat utilization pipeline includes a first pipeline, a second pipeline, and a third pipeline. The first pipeline connects the air outlet of the drying mechanism to the air inlet of the cooling chamber. The second pipeline connects the air outlet of the cooling chamber to the air inlet of the preheating chamber. The third pipeline connects the air outlet of the preheating chamber to the air inlet of the drying mechanism.

[0012] Preferably, the sealed conveying device includes a sealed high-temperature scraper discharge machine, a sealed high-temperature elevator, and a sealed high-temperature scraper distribution machine connected in sequence; the inlet end of the sealed high-temperature scraper discharge machine is connected to the discharge end of the cooling chamber, and each discharge end of the sealed high-temperature scraper distribution machine is connected to the inlet end of each of the slow cooling tanks.

[0013] Preferably, each of the slow cooling tanks is provided with a valve body at its inlet and outlet ends, and the valve body is used to open or close the corresponding inlet or outlet end.

[0014] Preferably, the heat exchange component is a heat exchange coil coiled inside the slow cooling tank, and the heat exchange coil has a heat exchange channel for the flow of cooling medium.

[0015] Preferably, the furnace body is provided with two pellet channels, which are spaced apart along the width direction of the furnace body; each pellet channel has a side wall on each of its opposite sides in the width direction, and the four side walls of the two pellet channels are arranged sequentially along the width direction, and each side wall is spliced ​​together from a permeable grating plate.

[0016] Preferably, the pellet channel located in the roasting chamber includes a roasting section and a homogenizing section arranged in a top-to-bottom direction; heat-resistant steel plates are respectively provided on the outer sides of the two opposite side walls of the homogenizing section, and the heat-resistant steel plates block the ventilation gaps of the ventilation grid plates on the corresponding side walls.

[0017] Preferably, along the width direction of the furnace body, the two pellet channels divide the roasting chamber into an inner roasting cavity located between the two pellet channels, and two outer roasting cavities located outside the two pellet channels respectively; the inner roasting cavity is divided into an inner upper chamber and an inner lower chamber by an inner roasting partition, and the two outer roasting cavities are divided into an outer upper chamber and an outer lower chamber by outer roasting partitions respectively, and the outer roasting partitions are higher than the inner roasting partitions.

[0018] Preferably, the heat source includes a plurality of burners respectively disposed in the two outer lower chambers; each burner is spaced apart along the height direction of the roasting chamber, and at least one burner is higher than the inner roasting partition and at least one burner is lower than the inner roasting partition.

[0019] Preferably, the conveying mechanism includes a chain plate for carrying pellets; the drying mechanism includes a housing covering the outside of the chain plate, and along the running direction of the chain plate, the inner cavity of the housing is divided into at least two circulation chambers and one finishing chamber, each circulation chamber is provided with an air vent, and the finishing chamber is provided with an air inlet and an air outlet; a first drying partition located above the chain plate is provided between two adjacent circulation chambers, and the two adjacent circulation chambers are interconnected below the chain plate; the finishing chamber and the adjacent circulation chamber are provided with the first drying partition located above the chain plate and a second drying partition located below the chain plate.

[0020] The working principle and beneficial effects of this invention are as follows:

[0021] This invention connects a plate chain drying device, a gravity-flow calciner, and a slow-cooling device in sequence, enabling pellets to continuously complete drying, preheating, calcination, cooling, and slow cooling. A sealed conveyor then transports the pellets out of the furnace into a slow-cooling tank for heat exchange and cooling, thereby reducing the contact between the high-temperature pellets and the outside air. This reduces the re-oxidation of carbothermic reduced pellets during the furnace exit and slow cooling processes, helping to maintain their reduced state. Simultaneously, airflow between the drying mechanism, cooling chamber, and preheating chamber is sequentially organized through first, second, and third pipelines. The hot air generated from cooling the pellets is used to preheat the pellets, and the preheated hot air is then used to dry the pellets, achieving cascaded heat utilization, reducing heat loss caused by direct discharge of high-temperature waste heat, and lowering system operating energy consumption. Attached Figure Description

[0022] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0023] Figure 1 This is a component connection diagram of a carbothermal reduction pellet roasting system provided in an embodiment of the present invention;

[0024] Figure 2 This is a schematic diagram of the plate chain drying device provided in an embodiment of the present invention;

[0025] Figure 3 A cross-sectional view of a self-flowing calciner provided in an embodiment of the present invention;

[0026] Figure 4 for Figure 3 A magnified view of a section at point B in the middle;

[0027] In the diagram: 1. Plate chain drying device; 11. Conveying mechanism; 111. Chain plate; 121. Box body; 122. Circulation chamber; 123. Finishing chamber; 124. Vent; 125. Air inlet; 126. Air outlet; 127. First drying partition; 128. Second drying partition; 2. Self-flowing calciner; 21. Furnace body; 211. Preheating chamber; 212. Calcining chamber; 213. Cooling chamber; 22. Pelletizing channel; 222. Permeable grating plate; 223. Calcining section; 224. Soaking section; 225. Heat-resistant steel plate; 23. Heat... Source; 231, Burner; 24, Calcination chamber; 241, Calcination inner baffle; 242, Inner upper chamber; 243, Inner lower chamber; 25, Calcination outer chamber; 251, Calcination outer baffle; 252, Outer upper chamber; 253, Outer lower chamber; 3, Slow cooling device; 311, Sealed high-temperature scraper discharge machine; 312, Sealed high-temperature elevator; 313, Sealed high-temperature scraper distribution machine; 32, Slow cooling tank; 321, Heat exchange component; 322, Valve body; 4, Waste heat utilization pipeline; 41, First pipeline; 42, Second pipeline; 43, Third pipeline. Detailed Implementation

[0028] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. Other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are all within the protection scope of the present invention.

[0029] like Figure 1 As shown, the carbothermic reduction pellet roasting system of this embodiment includes a plate chain dryer 1, a gravity-flow roaster 2, a slow-cooling device 3, and a waste heat utilization pipeline 4. The plate chain dryer 1 is used for continuous conveying and drying of green pellets, and its output end is connected to the feed end of the gravity-flow roaster 2. The gravity-flow roaster 2 is used to preheat, roast, and cool the dried pellets in the furnace sequentially. The slow-cooling device 3 is located at the discharge end of the gravity-flow roaster 2 and is used to continue cooling the discharged pellets under air-isolated conditions. The waste heat utilization pipeline 4 connects the corresponding air outlets of the plate chain dryer 1 and the gravity-flow roaster 2, and is used to organize the circulation of airflows at different temperatures within the system.

[0030] In terms of specific structure, refer to Figure 1 and Figure 2As shown, the plate chain drying device of this embodiment includes a conveying mechanism 11 and a drying mechanism. The conveying mechanism 11 includes a chain plate 111 for carrying pellets, which is driven by a drive mechanism to circulate along a closed-loop path. The drying mechanism includes a housing 121 covering the outside of the chain plate 111. Along the running direction of the chain plate 111, the inner cavity of the housing 121 is divided into at least two circulation chambers 122 and a finishing chamber 123. Each circulation chamber 122 is provided with an air inlet 124, and the finishing chamber 123 is provided with an air inlet 125 and an air outlet 126. In this embodiment, two circulation chambers 122 are provided and arranged sequentially along the running direction of the chain plate 111.

[0031] A drying first partition 127 is provided between two adjacent circulation chambers 122, located above the chain plate 111, and the two adjacent circulation chambers 122 are interconnected below the chain plate 111. A drying first partition 127 located above the chain plate 111 and a drying second partition 128 located below the chain plate 111 are provided between the finishing chamber 123 and the adjacent circulation chamber 122, thus separating the finishing chamber 123 from the adjacent circulation chamber 122 both above and below the chain plate 111.

[0032] The drying airflow enters the housing 121 through the vent 124 of the circulation chamber 122, which is furthest from the finishing chamber 123. It then passes through the pellet material layer on the chain plate 111 in the circulation chamber 122, enters the adjacent circulation chamber 122 below the chain plate 111, and is discharged through the vent 124 of the circulation chamber 122. Subsequently, it enters the finishing chamber 123 through the inlet 125, passes through the pellet material layer in the finishing chamber 123, and is discharged through the outlet 126. The pellets are conveyed by the conveying mechanism 11, first passing through the finishing chamber 123, then passing through each circulation chamber in sequence, and finally being sent to the feed end of the self-flowing roaster 2 from the output end of the conveying mechanism 11.

[0033] like Figure 3 As shown, the self-flowing calciner 2 of this embodiment includes a furnace body 21, a pellet channel 22, and a heat source 23. The inner cavity of the furnace body 21 is sequentially divided into a preheating chamber 211, a calcining chamber 212, and a cooling chamber 213 from top to bottom. The pellet channel 22 extends through the preheating chamber 211, calcining chamber 212, and cooling chamber 213 along the height of the furnace body 21. After entering from the top of the pellet channel 22, the pellets pass through the preheating chamber 211, calcining chamber 212, and cooling chamber 213 sequentially under gravity, completing preheating, calcination, and in-furnace cooling without the need for transfer between different main units.

[0034] In this embodiment, the furnace body 21 is provided with two pellet channels 22, which are parallel and spaced apart along the width direction of the furnace body 21. Each pellet channel 22 has a side wall on each of its opposite sides in the width direction, forming a total of four side walls arranged sequentially along the width direction. Each side wall is made of permeable grid plates 222 spliced ​​together. The permeable grid plates 222 form ventilation gaps smaller than the pellet particle size, which can both prevent pellet side leakage and allow airflow to pass laterally through the pellet material layer. By using two spaced pellet channels 22, the lateral penetration distance of airflow through the material layer in a single channel can be shortened while maintaining the throughput, which is beneficial for sufficient contact between airflow and pellets during preheating, roasting, and cooling.

[0035] In this embodiment, reference Figure 3 and Figure 4 As shown, the pellet channel 22 located in the roasting chamber 212 includes a roasting section 223 and a homogenizing section 224. The opposite sidewalls of the roasting section 223 are spliced ​​together with permeable grid plates 222 to allow hot air to pass through the material layer and heat the pellets. The opposite sidewalls of the homogenizing section 224 are also spliced ​​together with permeable grid plates 222, and a heat-resistant steel plate 225 is provided on the outside of this sidewall. The heat-resistant steel plate 225 seals the ventilation gaps of the permeable grid plates 222 to reduce the direct contact between the pellets and the external hot and cold airflow. After the pellets are heated in the roasting section 223, they enter the homogenizing section 224, where the surface heat continues to transfer to the interior, thereby reducing the temperature difference between the inside and outside of the pellets.

[0036] Along the width of the furnace body 21, two pellet channels 22 divide the roasting chamber 212 into an inner roasting cavity 24 located between the two pellet channels 22, and two outer roasting cavities 25 located outside the two pellet channels 22 respectively. The inner roasting cavity 24 is divided into an upper inner cavity 242 and an lower inner cavity 243 by an inner roasting partition 241; the two outer roasting cavities 25 are divided into an upper outer cavity 252 and an lower outer cavity 253 by outer roasting partitions 251 respectively, and the outer roasting partitions 251 are higher than the inner roasting partitions 241.

[0037] In this embodiment, the heat source 23 includes a burner and a plurality of burners 231 connected to the burner and respectively disposed in two outer lower chambers 253. The burners 231 are spaced apart along the height direction of the roasting chamber 212, with at least one burner 231 higher than the inner roasting baffle 241 and at least one burner 231 lower than the inner roasting baffle 241. The hot gas generated by the burners 231 enters the roasting section 223 from the outside of the pellet channel 22, and, guided by the staggered channel formed by the inner roasting baffle 241 and the outer roasting baffle 251, passes laterally through the pellet material layer at different height positions, making the pellets in the pellet channel more uniformly heated.

[0038] like Figure 1As shown, the slow cooling device 3 in this embodiment includes a sealed conveying device and several slow cooling tanks 32. The sealed conveying device includes a sealed high-temperature scraper discharge machine 311, a sealed high-temperature elevator 312, and a sealed high-temperature scraper distribution machine 313 connected in sequence. The inlet end of the sealed high-temperature scraper discharge machine 311 is connected to the discharge end of the cooling chamber 213, and is used to receive the pellets discharged from the gravity-flow calciner 2; the sealed high-temperature elevator 312 lifts the pellets to the inlet height of the slow cooling tanks 32; each discharge end of the sealed high-temperature scraper distribution machine 313 is connected to the inlet end of each slow cooling tank 32, and is used to distribute the pellets to different slow cooling tanks 32. It should be noted that the sealed high-temperature scraper discharge machine 311, the sealed high-temperature elevator 312, and the sealed high-temperature scraper distribution machine 313 can all refer to existing conveying equipment, and their structure and working principle will not be described in detail here.

[0039] In this embodiment, four slow-cooling tanks 32 are arranged side-by-side in the transverse direction. Each slow-cooling tank 32 is equipped with a valve body 322 at both its inlet and outlet ends. When feeding material into a slow-cooling tank 32, its inlet valve body 322 is opened and its outlet valve body 322 is closed; after feeding is completed, the inlet valve body 322 is closed, allowing the slow-cooling tank 32 to enter a sealed slow-cooling state; after slow-cooling is completed, the outlet valve body 322 is opened again to discharge the pellets. Multiple slow-cooling tanks 32 can be in feeding, slow-cooling, and discharging states respectively to adapt to the continuous discharge of the gravity-flow calciner 2.

[0040] Each slow-cooling tank 32 is equipped with a heat exchange component 321. In this embodiment, the heat exchange component 321 is a heat exchange coil coiled inside the slow-cooling tank 32, forming a heat exchange channel for the flow of cooling medium. The cooling medium can be circulating water. When the pellets are inside the slow-cooling tank 32, their heat is transferred to the cooling medium through the pipe wall, while the cooling medium does not directly contact the pellets.

[0041] The pellets from the furnace are fed into the slow cooling tank 32 through a sealed conveying device, and the temperature is reduced by indirect heat exchange. This reduces the contact between the high-temperature reduced pellets and the outside air, thus reducing the degree of re-oxidation. At the same time, the operation of multiple slow cooling tanks can ensure the continuous discharge of the upstream roasting machine without interrupting the slow cooling time.

[0042] like Figure 1As shown, the waste heat utilization pipeline 4 includes a first pipeline 41, a second pipeline 42, and a third pipeline 43. The first pipeline 41 connects the air outlet of the drying mechanism to the air inlet of the cooling chamber 213, and is used to send the low-temperature airflow discharged from the plate chain dryer 1 into the cooling chamber 213 as the inlet air for cooling the pellets. The second pipeline 42 connects the air outlet of the cooling chamber 213 to the air inlet of the preheating chamber 211, and is used to send the hot air formed after cooling the high-temperature pellets into the preheating chamber 211 to preheat the pellets just entering the furnace. The third pipeline 43 connects the air outlet of the preheating chamber 211 to the air inlet of the drying mechanism, and is used to send the hot air discharged from the preheating chamber 211 back to the plate chain dryer 1 to dry the green pellets.

[0043] The cooling chamber 213 receives air at a relatively low temperature, the preheating chamber 211 receives hot air enhanced by the sensible heat of the pellets, and the drying unit receives hot air that still has utilization value after preheating, thereby realizing the tiered utilization of heat at different temperature levels and reducing the direct discharge of high-temperature waste heat.

[0044] The overall working principle of this invention is as follows:

[0045] Green pellets are laid on chain plate 111 and enter the box 121 along with chain plate 111. Hot air discharged from preheating chamber 211 enters the drying mechanism through third pipe 43, and passes through the pellet material layer in each circulation chamber 122 and the finishing chamber 123 in sequence, so that the moisture in the green pellets is heated and discharged. The dried pellets enter the pellet channel 22 of gravity-flow calciner 2 from the output end of conveying mechanism 11.

[0046] The pellets first enter the preheating chamber 211. The hot air discharged from the cooling chamber 213 enters the preheating chamber 211 through the second pipe 42, passing laterally through the pellet bed to raise the temperature of the pellets. The hot air after heat exchange returns to the drying unit through the third pipe 43.

[0047] The preheated pellets continue to move down to the roasting chamber 212. The hot air generated by the burner 231 passes laterally through the pellet layer in the roasting section 223, enabling the pellets to complete the roasting, consolidation, and reduction reactions. Subsequently, the pellets enter the homogenization section 224, where they continue to be homogenized under conditions that reduce the direct impact of external airflow.

[0048] The roasted pellets enter the cooling chamber 213. The airflow discharged from the drying mechanism enters the cooling chamber 213 through the first pipe 41, exchanges heat with the high-temperature pellets to form hot air, and is sent into the preheating chamber 211 through the second pipe 42. After the pellet temperature is initially reduced in the cooling chamber 213, it is discharged from the bottom of the furnace body 21.

[0049] The pellets exiting the furnace sequentially pass through a sealed high-temperature scraper discharge machine 311, a sealed high-temperature elevator 312, and a sealed high-temperature scraper distribution machine 313 before entering a slow cooling tank 32 in the feeding state. After closing the inlet valve 322 and outlet valve 322 of the slow cooling tank 32, the cooling medium circulates within the heat exchange coils, absorbing heat from the pellets and allowing them to continue cooling under sealed conditions. After slow cooling is completed, the outlet valve 322 is opened to discharge the pellets. Other slow cooling tanks 32 can be used in the same manner for alternating feeding and slow cooling to match the continuous discharge from upstream.

[0050] Through the above process, the pellets continuously complete drying, preheating, calcination, furnace cooling and closed slow cooling in the same system; at the same time, the drying airflow, cooling hot air and preheating hot air are recycled along the waste heat utilization pipeline 4, which not only reduces the risk of re-oxidation of the carbothermic reduction pellets after they are taken out of the furnace, but also improves the system heat utilization rate.

[0051] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A carbothermic reduction pellet roasting system, characterized in that, It includes a plate chain drying device, a self-flowing roasting machine, a slow cooling device, and waste heat utilization pipelines; The plate chain drying device includes a conveying mechanism for conveying pellets and a drying mechanism for drying the pellets, wherein the output end of the conveying mechanism is connected to the feed end of the gravity-flow calciner; The self-flowing calciner includes a furnace body and a pellet channel disposed within the furnace body. The inner cavity of the furnace body is sequentially divided into a preheating chamber, a calcining chamber, and a cooling chamber along the top-to-bottom direction. The pellet channel passes through the preheating chamber, the calcining chamber, and the cooling chamber along the height direction of the furnace body. A heat source for heating the pellets is provided in the calcining chamber. The slow cooling device is located at the discharge end of the self-flowing calciner and includes a sealed conveying device and several slow cooling tanks. The inlet end of the sealed conveying device is connected to the discharge end of the cooling chamber, and the discharge end is connected to the inlet end of each slow cooling tank. Each slow cooling tank is provided with a heat exchange component for indirect heat exchange of the pellets. The waste heat utilization pipeline includes a first pipeline, a second pipeline, and a third pipeline. The first pipeline connects the air outlet of the drying mechanism to the air inlet of the cooling chamber. The second pipeline connects the air outlet of the cooling chamber to the air inlet of the preheating chamber. The third pipeline connects the air outlet of the preheating chamber to the air inlet of the drying mechanism.

2. The carbothermic reduction pellet roasting system according to claim 1, characterized in that, The sealed conveying device includes a sealed high-temperature scraper discharge machine, a sealed high-temperature elevator, and a sealed high-temperature scraper distribution machine connected in sequence; the inlet end of the sealed high-temperature scraper discharge machine is connected to the discharge end of the cooling chamber, and each discharge end of the sealed high-temperature scraper distribution machine is connected to the inlet end of each of the slow cooling tanks.

3. The carbothermic reduction pellet roasting system according to claim 2, characterized in that, Each of the slow cooling tanks is equipped with a valve body at its inlet and outlet ends, and the valve body is used to open or close the corresponding inlet or outlet end.

4. The carbothermic reduction pellet roasting system according to claim 1, characterized in that, The heat exchange component is a heat exchange coil coiled inside the slow cooling tank, and a heat exchange channel for the flow of cooling medium is formed inside the heat exchange coil.

5. The carbothermic reduction pellet roasting system according to claim 1, characterized in that, The furnace body is provided with two pellet channels, which are spaced apart along the width direction of the furnace body; each pellet channel has a side wall on each of its opposite sides in the width direction, and the four side walls of the two pellet channels are arranged sequentially along the width direction, and each side wall is spliced ​​together from a breathable grating plate.

6. The carbothermic reduction pellet roasting system according to claim 5, characterized in that, The pellet channel located in the roasting chamber includes a roasting section and a homogenizing section arranged in a top-to-bottom direction; heat-resistant steel plates are respectively provided on the outer sides of the two opposite side walls of the homogenizing section, and the heat-resistant steel plates block the ventilation gaps of the ventilation grid plates on the corresponding side walls.

7. The carbothermic reduction pellet roasting system according to claim 6, characterized in that, Along the width direction of the furnace body, the two pellet channels divide the roasting chamber into an inner roasting cavity located between the two pellet channels, and two outer roasting cavities located outside the two pellet channels respectively; the inner roasting cavity is divided into an inner upper cavity and an inner lower cavity by an inner roasting partition, and the two outer roasting cavities are divided into an outer upper cavity and an outer lower cavity by outer roasting partitions respectively, and the outer roasting partitions are higher than the inner roasting partitions.

8. The carbothermic reduction pellet roasting system according to claim 7, characterized in that, The heat source includes a plurality of burners respectively disposed in the two outer lower chambers; each burner is spaced apart along the height direction of the roasting chamber, and at least one burner is higher than the inner roasting partition and at least one burner is lower than the inner roasting partition.

9. The carbothermic reduction pellet roasting system according to claim 1, characterized in that, The conveying mechanism includes a chain plate for carrying pellets; the drying mechanism includes a box housing covering the outside of the chain plate, and along the running direction of the chain plate, the inner cavity of the box housing is divided into at least two circulation chambers and one finishing chamber, each circulation chamber having a vent, and the finishing chamber having an inlet and an outlet; adjacent A first drying partition is provided between the two circulation chambers, located above the chain plate, and the two adjacent circulation chambers are interconnected below the chain plate; the finishing chamber and the adjacent circulation chamber are provided with the first drying partition located above the chain plate and the second drying partition located below the chain plate.

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