Direct reduction iron heating device and heating method

Abstract

The invention discloses a direct reduction iron heating device and a heating method, and relates to the technical field of iron reduction.The direct reduction iron heating device is characterized in that when the direct reduction iron heating device is used, a first partition serves as a heating area, a second partition serves as a reduction area, a third partition serves as a cooling area, a fourth partition is used for feeding and discharging, and a reaction space is filled with oxygen-free medium gas; a circulating unit is started to enable medium gas in the reaction space to circularly flow, a heating unit heats the medium gas flowing through a temperature rising area and a reduction area to a preset temperature, materials are evenly laid on a rotary body in a fourth area and the rotary body is made to rotate, and the medium gas penetrates through a ventilation structure from a first annular groove and then enters a second annular groove; and the medium gas flowing through the second annular groove is sucked into the gas distribution unit through the circulation unit for redistribution. According to the heating device, the structural design and the heating mode are optimized, the high-temperature medium gas serves as a heat transfer medium, the medium gas heats materials in a radiation and convection mode, and the heating efficiency is higher than that of heating through single radiation heat.

Description

Technical Field

[0001] The present application relates to the technical field of iron reduction, and in particular to a direct reduced iron heating device and a heating method. Background Art

[0002] Nowadays, the price of steel resources is getting more and more expensive, so direct reduction iron production is getting more and more attention. There are two methods for direct reduction iron production in the prior art: gas-based reduction method and coal-based reduction method. The gas-based reduction method uses natural gas as the reducing agent, and the coal-based reduction method uses coal or coke as the reducing agent. However, whether it is the reduction method using natural gas, coal or coke as the reducing agent, there are at least the following disadvantages: high fuel calorific value requirements, high exhaust temperature, energy waste, environmental pollution, and low heating efficiency. Summary of the invention

[0003] The present application aims to solve one of the above technical problems in the prior art. To this end, the present application provides a direct reduced iron heating device.

[0004] The embodiments of the present application also provide a method for heating direct reduced iron.

[0005] According to an embodiment of the first aspect of the present application, a direct reduced iron heating device is provided, comprising:

[0006] The annular first shell is provided with a first annular groove, wherein the first annular groove is provided with a first partition, a second partition, a third partition and a fourth partition in sequence;

[0007] The annular second housing is provided with a second annular groove;

[0008] An annular rotating body capable of rotating around its center, the rotating body being located between the first shell and the second shell, the first shell, the second shell and the rotating body forming a closed reaction space, and a ventilation structure being arranged on the portion of the rotating body between the first annular groove and the second annular groove so that the first annular groove is connected with the second annular groove;

[0009] The gas circulation module includes a gas distribution unit, a circulation unit and a heating unit. The first partition, the second partition, and the third partition are all connected to the gas distribution unit through a gas distribution structure. One end of the circulation unit is connected to the second annular groove, and the other end of the circulation unit is connected to the gas distribution unit. The gas distribution unit is used to distribute the gas sucked by the circulation unit to each of the gas distribution structures, wherein the gas distribution structure connected to the first partition and the gas distribution structure connected to the second partition are both provided with the heating unit.

[0010] The above-mentioned direct reduced iron heating device has at least the following beneficial effects: when in use, the first partition is used as a heating zone, the second partition is used as a reduction zone, the third partition is used as a cooling zone, and the fourth partition is used for loading and unloading. The reaction space is filled with oxygen-free medium gas, and the circulation unit is turned on to circulate the medium gas in the reaction space. The heating unit heats the medium gas flowing through the gas distribution structure connecting the first partition and the gas distribution unit to a first preset temperature, and the heating unit heats the medium gas flowing through the gas distribution structure connecting the second partition and the gas distribution unit to a second preset temperature. In the fourth partition, the material is evenly spread on the rotating body and the rotating body rotates at a uniform speed. The medium gas passes through the air permeable structure from above the first annular groove in sequence and enters the second annular groove. The medium gas flowing through the second annular groove is then sucked into the gas distribution unit through the circulation unit for redistribution. The heating device of the present application optimizes the structural design and heating method, and uses high-temperature medium gas as the heat transfer medium. The medium gas heats the material by radiation and convection, which is more efficient than heating by radiation heat alone; the medium gas penetrates the material layer from top to bottom, and the number of material layers can be greater than the traditional radiation heating method using flames (radiation heat transfer can only directly transfer heat to the top layer); oxygen-free medium gas is used as the heat transfer medium, so that the reducing atmosphere of the heat transfer process is not destroyed, and the reduction rate is higher; the medium gas is recycled, saving energy and reducing emissions.

[0011] According to the direct reduced iron heating device described in the embodiment of the first aspect of the present application, the gas distribution unit includes a gas distribution component, and the gas distribution component is used to divert the gas distributed by the gas distribution unit to various positions of the first partition, the second partition or the third partition.

[0012] According to the direct reduced iron heating device described in the embodiment of the first aspect of the present application, the gas distribution component includes a plurality of gas outlets, the gas outlets are connected to the first annular groove, and the plurality of gas outlets are arranged in a circular array with the rotation center of the rotating body as the center of the circle.

[0013] According to the direct reduced iron heating device described in the embodiment of the first aspect of the present application, the covering width of the air-permeable structure is greater than the notch width of the first annular groove or the notch width of the second annular groove.

[0014] According to the direct reduced iron heating device described in the embodiment of the first aspect of the present application, the air permeable structure includes a plurality of air holes arranged in an array, and the air holes penetrate from one side of the rotating body to the other side. From one end of the air holes to the other end, the diameter of the air holes gradually increases, and the end of the air holes with a larger diameter faces the second annular groove.

[0015] According to the direct reduced iron heating device described in the embodiment of the first aspect of the present application, the groove walls on both sides of the second annular groove form a cone, and the groove width of the second annular groove is larger than the groove bottom.

[0016] According to the direct reduced iron heating device described in the embodiment of the first aspect of the present application, a first sealing structure is provided between the first shell and the rotating body, and a second sealing structure is provided between the second shell and the rotating body.

[0017] According to the direct reduced iron heating device described in the embodiment of the first aspect of the present application, the first sealing structure includes a first ring-shaped member, a second ring-shaped member and an annular storage tank filled with liquid, one side of the first ring-shaped member is arranged on the first shell, and the other side of the first ring-shaped member extends into the liquid in the annular storage tank, one side of the second ring-shaped member is arranged on the rotating body, and the other side of the second ring-shaped member extends into the liquid in the annular storage tank.

[0018] According to the direct reduced iron heating device described in the embodiment of the first aspect of the present application, the second sealing structure includes a third ring member, a fourth ring member and an annular storage tank filled with liquid, one side of the third ring member is arranged on the rotating body, and the other side of the third ring member extends into the liquid in the annular storage tank, and one side of the fourth ring member is arranged on the second shell, and the other side of the fourth ring member extends into the liquid in the annular storage tank.

[0019] According to an embodiment of the second aspect of the present application, a direct reduced iron heating method is provided, comprising the following steps:

[0020] The first partition is used as a heating zone, the second partition is used as a reduction zone, the third partition is used as a cooling zone, and the fourth partition is used for loading and unloading. The reaction space is filled with oxygen-free medium gas;

[0021] In the fourth partition, the material is evenly spread on the rotating body, and the circulation unit is turned on to circulate the medium gas in the reaction space. The medium gas passes through the air permeable structure from the first annular groove and enters the second annular groove. The medium gas flowing through the second annular groove is then sucked into the gas distribution unit through the circulation unit for redistribution;

[0022] The heating unit heats the medium gas flowing through the gas distribution structure connecting the first partition and the gas distribution unit to a first preset temperature, and the heating unit heats the medium gas flowing through the gas distribution structure connecting the second partition and the gas distribution unit to a second preset temperature, wherein the setting range of the first preset temperature is 1200±50°C, and the setting range of the second preset temperature is 1350±50°C;

[0023] Wherein, the rotating body rotates at a constant speed, and the time for one rotation of the rotating body is controlled within 20 to 50 minutes.

[0024] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The present application is further described below with reference to the accompanying drawings and embodiments;

[0026] Figure 1 This is a schematic diagram of the structure of the direct reduced iron heating device of the embodiment of the present application. Figure 1 ;

[0027] Figure 2 This is a schematic diagram of the structure of the direct reduced iron heating device of the embodiment of the present application. Figure 2 ;

[0028] Figure 3 This is a schematic diagram of the structure of the direct reduced iron heating device of the embodiment of the present application. Figure 3 .

[0029] Figure numerals: rotating body 100, loading area 101, first partition 102, second partition 103, third partition 104, unloading area 105, breathable structure 110, second annular member 120, third annular member 130, supporting leg 140, first shell 200, first annular member 201, first annular groove 210, air distribution member 220, diverter pipe 221, air distribution pipe 230, heating unit 300, air distribution unit 400, second shell 500, fourth annular member 501, second annular groove 510, first pipeline 520, circulation unit 600, second pipeline 610, material 700, annular storage tank 800, rolling support device 900. DETAILED DESCRIPTION

[0030] This section will describe in detail the specific embodiments of the present application. The preferred embodiments of the present application are shown in the accompanying drawings. The purpose of the accompanying drawings is to supplement the description of the text part of the specification with graphics, so that people can intuitively and vividly understand each technical feature and the overall technical solution of the present application, but it cannot be understood as a limitation on the scope of protection of the present application.

[0031] In the description of the present application, it should be understood that descriptions involving orientation, such as up, down, front, back, left, right, etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0032] In the description of this application, "several" means one or more, "more" means more than two, "greater than", "less than", "exceed", etc. are understood to exclude the number itself, and "above", "below", "within", etc. are understood to include the number itself. If there is a description of "first" or "second", it is only used for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0033] In the description of this application, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in this application based on the specific content of the technical solution.

[0034] Reference Figures 1 to 3 The direct reduced iron heating device provided in the embodiment of the present application includes a first shell 200, a second shell 500, a rotating body 100 and a gas circulation module.

[0035] Among them, the first shell 200 is annular, and the first annular groove 210 is arranged on the side of the first shell 200 facing downward. The first shell 200 is fixedly arranged. At the same time, the first annular groove 210 is divided into a first partition 102, a second partition 103, a third partition 104 and a fourth partition which are arranged in sequence. The first partition 102 is used for heating, the second partition 103 is used for reduction reaction, the third partition 104 is used for cooling, and the fourth partition is used for loading and unloading of material 700. Among them, half of the fourth partition is used as the unloading area 105, and the other half is used as the loading area 101. A partition wall is set between the loading area 101 and the unloading area.

[0036] The second shell 500 is fixedly arranged and is also annular. The second shell 500 is arranged opposite to the first shell 200 . A second annular groove 510 is arranged on a side of the second shell 500 facing the first shell 200 . The second annular groove 510 is arranged opposite to the first annular groove 210 .

[0037] The rotating body 100 is also annular, wherein the rotating body 100 can rotate around its circle. The rotating body 100 is located between the first shell 200 and the second shell 500. The rotating body 100 is used to carry the material 700, so that the rotating body 100 rotates, so that the material 700 can flow through the first partition 102, the second partition 103, the third partition 104 and the fourth partition. Furthermore, the first shell 200, the second shell 500 and the rotating body 100 form a closed reaction space. The part of the rotating body 100 between the first annular groove 210 and the second annular groove 510 is provided with a breathable structure 110 to connect the first annular groove 210 with the second annular groove 510.

[0038] The gas circulation module includes a gas distribution unit 400, a circulation unit 600 and a heating unit 300. The first partition 102, the second partition 103, and the third partition 104 are all connected to the gas distribution unit 400 through a gas distribution structure. One end of the circulation unit 600 is connected to the second annular groove 510, and the other end of the circulation unit 600 is connected to the gas distribution unit 400. The gas distribution unit 400 is used to distribute the gas sucked by the circulation unit 600 to each gas distribution structure, wherein the gas distribution structure connected to the first partition 102 and the gas distribution structure connected to the second partition 103 are both provided with a heating unit 300.

[0039] In the embodiment of the present application, oxygen-free gas (such as nitrogen, natural gas, coal gas, water vapor, etc.) is used as the medium gas. The medium gas enters the top of the first annular groove 210 through the gas distribution structure. The medium gas passes through the material 700 and the breathable structure 110 and then merges with the second annular groove 510. The second annular groove 510 is connected to the circulation unit 600. The circulation unit 600 pressurizes the medium gas and sends it into the gas distribution unit 400. The gas distribution unit 400 distributes the medium gas to each gas distribution structure, and then distributes it to the areas corresponding to the temperature rising zone, high temperature zone, and temperature falling zone through each gas distribution structure.

[0040] A heating unit 300 is provided on the gas distribution structure connecting the first partition 102 and the gas distribution unit 400, and a heating unit 300 is also provided on the gas distribution structure connecting the second partition 103 and the gas distribution unit 400. The heating unit 300 is used for heating the medium gas, wherein the heating unit 300 uses a power-adjustable plasma torch or an electric heating rod to heat the medium gas to a required temperature.

[0041] When in use, the first partition 102 is used as a heating zone, the second partition 103 is used as a reduction zone, the third partition 104 is used as a cooling zone, and the fourth partition is used for loading and unloading of material 700. The reaction space is filled with oxygen-free medium gas. The circulation unit 600 is turned on to circulate the medium gas in the reaction space. The heating unit 300 heats the medium gas flowing through the gas distribution structure connecting the first partition 102 and the gas distribution unit 400 to a first preset temperature. The heating unit 300 heats the medium gas flowing through the gas distribution structure connecting the second partition 103 and the gas distribution unit 400 to a second preset temperature. In the fourth partition, the material 700 is evenly spread on the rotating body 100 and the rotating body 100 rotates at a constant speed. The medium gas passes through the air permeable structure 110 from above the first annular groove 210 in sequence and then enters the second annular groove 510. The medium gas flowing through the second annular groove 510 is then sucked into the gas distribution unit 400 through the circulation unit 600 for redistribution.

[0042] The heating device of the present application optimizes the structural design and heating method, and uses high-temperature medium gas as the heat transfer medium. The medium gas heats the material 700 by radiation and convection, which is more efficient than heating by radiation heat alone. In addition, the medium gas penetrates 700 layers of the material from top to bottom, and the number of material layers can be greater compared to the traditional method of radiation heating using flames (radiation heat transfer can only directly transfer heat to the top layer). Furthermore, the present application uses oxygen-free medium gas as the heat transfer medium, so that the reducing atmosphere of the heat transfer process is not destroyed, and the reduction rate is higher. In addition, the medium gas can be recycled, saving energy and reducing emissions.

[0043] In some embodiments, the gas distribution unit 400 includes a gas distribution component 220 , and the gas distribution component 220 is used to divert the gas distributed by the gas distribution unit 400 to various positions of the first partition 102 , the second partition 103 , or the third partition 104 .

[0044] In a specific embodiment, Figure 1 and Figure 2 As shown, the gas distribution unit 400 also includes a gas distribution pipe 230, and the gas distribution member 220 and the gas distribution unit 400 are connected through the gas distribution pipe 230. The gas distribution member 220 is also annular, but the gas distribution member 220 is not a complete ring, and the coverage range of the gas distribution member 220 is from one end of the partition to the other end, so that the medium gas can be evenly distributed at various positions of the flow channel partition. In order to make the gas distribution more uniform, the gas distribution member 220 is provided with a gas distribution cavity, and the medium gas is redistributed through the gas distribution cavity.

[0045] In some embodiments, the gas distribution component 220 includes a plurality of gas outlets connected to the first annular groove 210. The plurality of gas outlets are arranged in a circular array with the rotation center of the rotating body 100 as the center, and the medium gas is evenly distributed to various positions of the partition through the gas outlets.

[0046] In some specific embodiments, a plurality of shunt pipes 221 extending into the first annular groove 210 are disposed in the gas distribution cavity, and the gas outlets are disposed in the shunt pipes 221 .

[0047] In some embodiments, the coverage width of the air-permeable structure 110 is greater than the slot width of the first annular groove 210 or the slot width of the second annular groove 510. The coverage width of the air-permeable structure 110 here refers to the radius difference between the inner circle and the outer circle of the air-permeable structure 110. Similarly, the slot width of the first annular groove 210 refers to the distance between the two sides of the slot of the first annular groove 210, and the slot width of the second annular groove 510 refers to the distance between the two sides of the slot of the second annular groove 510. Setting the coverage range of the air-permeable structure 110 to be greater than the slot width of the first annular groove 210 or the slot width of the second annular groove 510 can make the gas penetrate the material 700 more evenly, so that the heating is more sufficient and uniform.

[0048] In some embodiments, the air permeable structure 110 includes a plurality of air permeable holes arranged in an array, the air permeable holes penetrate from one side of the rotating body 100 to the other side, and the diameter of the air permeable holes gradually increases from one end to the other end of the air permeable holes, and the end with the larger diameter of the air permeable holes faces the second annular groove 510. The conical structure of the air permeable structure 110 can accelerate the flow of gas, effectively improve the heating efficiency, and also prevent the material 700 from being stuck in the air permeable structure 110.

[0049] In some embodiments, Figure 2 and Figure 3 As shown, the groove walls on both sides of the second annular groove 510 are formed into a cone, and the groove width of the second annular groove 510 is larger than the groove bottom. The shape of the second annular groove 510 is an inverted cone, which can facilitate the collection of gas and also increase the flow speed of gas.

[0050] The second annular groove 510 is connected to the circulation unit 600 through the first pipeline 520 , and the circulation unit 600 is connected to the air distribution unit 400 through the second pipeline 610 . The circulation unit 600 is a circulation fan.

[0051] In some embodiments, a first sealing structure is provided between the first housing 200 and the rotating body 100, and a second sealing structure is provided between the second housing 500 and the rotating body 100. The provision of the first sealing structure and the second sealing structure ensures the sealing of the reaction space, while not affecting the rotation of the rotating body 100.

[0052] In some specific embodiments, Figure 3 As shown, the first sealing structure includes a first annular member 201, a second annular member 120 and an annular storage groove 800 filled with liquid, one side of the first annular member 201 is arranged on the first shell 200, and the other side of the first annular member 201 extends into the liquid in the annular storage groove 800, and one side of the second annular member 120 is arranged on the rotating body 100, and the other side of the second annular member 120 extends into the liquid in the annular storage groove 800.

[0053] The arrangement of the first annular member 201 and the second annular member 120 , in cooperation with the liquid in the annular storage groove 800 , can achieve liquid sealing of the gap between the first shell 200 and the rotating body 100 , thereby preventing leakage of the medium gas and allowing the rotating body 100 to rotate.

[0054] In some specific embodiments, Figure 3As shown, the second sealing structure includes a third annular member 130, a fourth annular member 501 and an annular storage groove 800 filled with liquid, one side of the third annular member 130 is arranged on the rotating body 100, and the other side of the third annular member 130 extends into the liquid in the annular storage groove 800, and one side of the fourth annular member 501 is arranged on the second shell 500, and the other side of the fourth annular member 501 extends into the liquid in the annular storage groove 800.

[0055] The arrangement of the first and fourth annular members 501, in conjunction with the liquid in the annular storage tank 800, can seal the gap between the second shell 500 and the rotating body 100, thereby preventing leakage of the medium gas and allowing the rotating body 100 to rotate. Thus, the first shell 200, the second shell 500 and the rotating body 100 form a closed reaction space.

[0056] In some specific embodiments, the rotating body 100 further includes support legs 140 , and the support legs 140 are installed on the ground through rolling support devices 900 , so that the rotating body 100 can rotate.

[0057] The present application also provides a method for heating direct reduced iron based on the above-mentioned direct reduced iron heating device, which specifically includes the following steps:

[0058] The first partition 102 is used as a heating zone, the second partition 103 is used as a reduction zone, the third partition 104 is used as a cooling zone, and the fourth partition is used for loading and unloading. The reaction space is filled with oxygen-free medium gas;

[0059] In the fourth partition, the material 700 is evenly spread on the rotating body 100, and the circulation unit 600 is turned on to circulate the medium gas in the reaction space. The medium gas passes through the air-permeable structure 110 from the first annular groove 210 and enters the second annular groove 510. The medium gas flowing through the second annular groove 510 is then sucked into the gas distribution unit 400 by the circulation unit 600 for redistribution.

[0060] The heating unit 300 heats the medium gas flowing through the gas distribution structure connecting the first partition 102 and the gas distribution unit 400 to a first preset temperature, and the heating unit 300 heats the medium gas flowing through the gas distribution structure connecting the second partition 103 and the gas distribution unit 400 to a second preset temperature. The setting range of the first preset temperature is 1200±50°C, and the setting range of the second preset temperature is 1350±50°C.

[0061] The rotating body 100 rotates at a constant speed, and the time for one rotation of the rotating body 100 is controlled to be between 20 and 50 minutes.

[0062] In some specific embodiments, the first preset temperature is set to 1200° C., the second preset temperature is set within a range of 1300° C., and the time for the rotary body 100 to rotate one circle is controlled within 30 minutes.

[0063] The embodiments of the present application are described in detail above in conjunction with the accompanying drawings, but the present application is not limited to the above embodiments, and various changes can be made within the knowledge scope of ordinary technicians in the technical field without departing from the purpose of the present application.

Claims

1. A direct reduced iron heating device, characterized in that: include The annular first shell is provided with a first annular groove, wherein the first annular groove is provided with a first partition, a second partition, a third partition and a fourth partition in sequence; The annular second housing is provided with a second annular groove; An annular rotating body capable of rotating around its center, the rotating body being located between the first shell and the second shell, the first shell, the second shell and the rotating body forming a closed reaction space, and a ventilation structure being arranged on the portion of the rotating body between the first annular groove and the second annular groove so that the first annular groove is connected with the second annular groove; The gas circulation module includes a gas distribution unit, a circulation unit and a heating unit. The first partition, the second partition, and the third partition are all connected to the gas distribution unit through a gas distribution structure. One end of the circulation unit is connected to the second annular groove, and the other end of the circulation unit is connected to the gas distribution unit. The gas distribution unit is used to distribute the gas sucked by the circulation unit to each of the gas distribution structures, wherein the gas distribution structure connected to the first partition and the gas distribution structure connected to the second partition are both provided with the heating unit.

2. The direct reduced iron heating device according to claim 1, characterized in that: The gas distribution unit includes a gas distribution component, and the gas distribution component is used to divert the gas distributed by the gas distribution unit to various positions of the first partition, the second partition or the third partition.

3. The direct reduced iron heating device according to claim 2, characterized in that: The gas distribution component includes a plurality of gas outlets, the gas outlets are connected to the first annular groove, and the plurality of gas outlets are arranged in a circular array with the rotation center of the rotating body as the center of the circle.

4. The direct reduced iron heating device according to claim 1, characterized in that: The covering width of the air-permeable structure is greater than the notch width of the first annular groove or the notch width of the second annular groove.

5. The direct reduced iron heating device according to claim 4, characterized in that: The ventilation structure includes a plurality of ventilation holes arranged in an array, and the ventilation holes extend from one side of the rotating body to the other side. The diameter of the ventilation holes gradually increases from one end to the other end of the ventilation holes, and the end with the larger diameter of the ventilation holes faces the second annular groove.

6. The direct reduced iron heating device according to claim 1, characterized in that: The groove walls on both sides of the second annular groove are tapered, and the groove opening width of the second annular groove is greater than the groove bottom.

7. The direct reduced iron heating device according to claim 1, characterized in that: A first sealing structure is provided between the first shell and the rotating body, and a second sealing structure is provided between the second shell and the rotating body.

8. The direct reduced iron heating device according to claim 7, characterized in that: The first sealing structure includes a first annular member, a second annular member and an annular storage groove filled with liquid, one side of the first annular member is arranged on the first shell, and the other side of the first annular member extends into the liquid in the annular storage groove, one side of the second annular member is arranged on the rotating body, and the other side of the second annular member extends into the liquid in the annular storage groove.

9. The direct reduced iron heating device according to claim 7, characterized in that: The second sealing structure includes a third annular member, a fourth annular member and an annular storage groove filled with liquid, one side of the third annular member is arranged on the rotating body, and the other side of the third annular member extends into the liquid in the annular storage groove, one side of the fourth annular member is arranged on the second shell, and the other side of the fourth annular member extends into the liquid in the annular storage groove.

10. A method for heating direct reduced iron, based on the direct reduced iron heating device according to any one of claims 1 to 9, characterized in that: The steps include: The first partition is used as a heating zone, the second partition is used as a reduction zone, the third partition is used as a cooling zone, and the fourth partition is used for loading and unloading. The reaction space is filled with oxygen-free medium gas; In the fourth partition, the material is evenly spread on the rotating body, and the circulation unit is turned on to circulate the medium gas in the reaction space. The medium gas passes through the air permeable structure from the first annular groove and enters the second annular groove. The medium gas flowing through the second annular groove is then sucked into the gas distribution unit through the circulation unit for redistribution; The heating unit heats the medium gas flowing through the gas distribution structure connecting the first partition and the gas distribution unit to a first preset temperature, and the heating unit heats the medium gas flowing through the gas distribution structure connecting the second partition and the gas distribution unit to a second preset temperature, wherein the setting range of the first preset temperature is 1200±50°C, and the setting range of the second preset temperature is 1350±50°C; Wherein, the rotating body rotates at a constant speed, and the time for one rotation of the rotating body is controlled within 20 to 50 minutes.

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