High-temperature preheating smelting reduction ironmaking system

Abstract

The invention discloses a high-temperature preheating smelting reduction ironmaking system which comprises a smelting reduction furnace provided with a coal gas outlet; the first waste heat recovery device is connected to the coal gas outlet and used for recycling the discharged heat energy of the coal gas in the first temperature interval so as to obtain the coal gas in the second temperature interval; the heat exchange device is connected to the first waste heat recovery device and the carrier gas source and used for conducting heat exchange on the normal-temperature injection carrier gas and part of the second temperature interval coal gas, and high-temperature injection carrier gas and third temperature interval coal gas are obtained; the second waste heat recovery device is connected to the first waste heat recovery device and used for recycling the other part of coal gas heat energy in the second temperature interval; and the hot ore supply part is connected to the heat exchange device and the smelting reduction furnace, and the hot ore supply part is used for providing preheated hot iron ore powder and conveying the hot iron ore powder to the smelting reduction furnace through high-temperature injection carrier gas. Therefore, the heat loss of the hot iron ore powder is reduced, reduction reaction is facilitated, the coal ratio is reduced, the carbon emission is reduced, and the ironmaking yield is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of non-blast furnace ironmaking, and particularly to a high-temperature preheating smelting reduction ironmaking system. Background Art

[0002] At present, the non-blast furnace smelting reduction ironmaking process has gradually been recognized and promoted in the industry, but there are still problems such as high unit process energy consumption, high carbon emissions, waste of waste heat of smelting reduction gas, insufficient reduction reaction and low output. Summary of the Invention

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art or related technologies.

[0004] To this end, the present invention provides a high-temperature preheating smelting reduction ironmaking system.

[0005] In view of this, according to an embodiment of the present application, a high-temperature preheating smelting reduction ironmaking system is proposed, including:

[0006] A smelting reduction furnace, which is provided with a gas discharge port;

[0007] A first waste heat recovery device, connected to the gas discharge port, for recovering and utilizing the heat energy of the first-temperature gas discharged through the gas discharge port to obtain a second-temperature gas;

[0008] A heat exchange device, connected to the first waste heat recovery device and a carrier gas source, for exchanging heat between the normal-temperature injection carrier gas conveyed by the carrier gas source and a part of the second-temperature gas conveyed by the first waste heat recovery device to obtain a high-temperature injection carrier gas and a third-temperature gas;

[0009] A second waste heat recovery device, connected to the first waste heat recovery device, for recovering and utilizing the heat energy of another part of the second-temperature gas conveyed by the first waste heat recovery device to obtain the third-temperature gas;

[0010] A hot ore supply unit, respectively connected to the heat exchange device and the smelting reduction furnace, for providing preheated hot iron ore powder, and conveying the hot iron ore powder to the smelting reduction furnace through the high-temperature injection carrier gas.

[0011] In a feasible embodiment, the temperature of the first-temperature gas is 1400°C to 1600°C;

[0012] The temperature of the second-temperature gas is 750°C to 850°C;

[0013] The temperature of the third-temperature gas is 150°C to 250°C.

[0014] In a feasible implementation, the temperature of the above-mentioned room-temperature blown carrier gas is 0°C to 40°C;

[0015] The temperature of the above-mentioned high-temperature blown carrier gas is 600°C to 700°C.

[0016] In a feasible implementation, the above-mentioned high-temperature preheating smelting reduction ironmaking system further includes:

[0017] A cyclone dust removal device, the input end of the cyclone dust removal device is connected to the above-mentioned first waste heat recovery device; the output end of the cyclone dust removal device is respectively connected to the above-mentioned heat exchange device and the above-mentioned second waste heat recovery device.

[0018] In a feasible implementation, the dust content of the gas after being treated by the above-mentioned cyclone dust removal device is 5 g / Nm 3 ~20 g / Nm 3 .

[0019] In a feasible implementation, the above-mentioned high-temperature preheating smelting reduction ironmaking system further includes:

[0020] A gas dust removal device, which is respectively connected to the above-mentioned heat exchange device and the above-mentioned second waste heat recovery device, and is used for dust removal and purification of the above-mentioned third-temperature gas transported by the above-mentioned second waste heat recovery device and the above-mentioned heat exchange device.

[0021] In a feasible implementation, the dust content of the gas after being treated by the above-mentioned gas dust removal device is less than or equal to 5 mg / Nm 3 .

[0022] In a feasible implementation, a hot ore screw feeder is connected to the above-mentioned heat exchange device;

[0023] A hot ore injection device, which is used to inject the above-mentioned hot iron ore powder into the above-mentioned hot ore screw feeder;

[0024] A spray gun is respectively connected to the above-mentioned hot ore screw feeder and the smelting reduction furnace, and is used to transport the above-mentioned hot iron ore powder to the above-mentioned smelting reduction furnace.

[0025] In a feasible implementation, the temperature of the above-mentioned hot iron ore powder is 600°C to 700°C, and the particle size is less than 10 mm.

[0026] In a feasible implementation, the blown carrier gas stored in the above-mentioned carrier gas source is nitrogen or carbon dioxide.

[0027] Compared with the prior art, the present invention has at least the following beneficial effects: The high-temperature preheating smelting reduction ironmaking system provided by the embodiments of the present application is provided with a smelting reduction furnace, a first waste heat recovery device, a heat exchange device, a second waste heat recovery device, and a hot ore supply section. Among them, the smelting reduction furnace is provided with a gas discharge port, and the first waste heat recovery device is connected to the gas discharge port to recover and utilize the heat energy of the first-temperature gas discharged through the gas discharge port during the reduction reaction of the smelting reduction furnace, and obtain the second-temperature gas. The heat exchange device is connected to the first waste heat recovery device and the carrier gas source. The carrier gas source can transport the normal-temperature injection carrier gas to the heat exchange device, and at the same time, the first waste heat recovery device transports a part of the second-interval temperature gas to the heat exchange device, so as to heat-exchange the normal-temperature injection carrier gas and the second-interval temperature gas through the heat exchange device to obtain the high-temperature injection carrier gas and the third-temperature gas. The second waste heat recovery device is connected to the first waste heat recovery device, and the first waste heat recovery device transports another part of the second-interval temperature gas to the second waste heat recovery device, and the second waste heat recovery device recovers and utilizes the heat of the second waste heat recovery device to obtain the third-temperature gas. The hot ore supply section is respectively connected to the heat exchange device and the smelting reduction furnace. The hot ore supply section can provide preheated hot iron ore powder, and transport the hot iron ore powder to the smelting reduction furnace through the high-temperature injection carrier gas. With such a setting, the heat of the high-temperature gas generated by the reduction reaction can be recovered and utilized, the high-temperature injection carrier gas can be prepared while reducing energy waste. During the process of transporting the hot iron ore powder through the high-temperature injection carrier gas, the high-temperature injection carrier gas can keep the hot iron ore powder warm to reduce the heat loss of the hot iron ore powder, which is beneficial to the reduction reaction of the hot iron ore powder, reduce the coal ratio, reduce the carbon emission during the smelting reduction ironmaking process, save energy and protect the environment, and improve the ironmaking output. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] By reading the following detailed description of the exemplary embodiments, various other advantages and benefits will become clear to those of ordinary skill in the art. The drawings are only for the purpose of illustrating the exemplary embodiments and are not considered to be a limitation of the present application. And throughout the drawings, the same reference numerals are used to represent the same components. In the drawings:

[0029] Figure 1 It is a schematic structural diagram of a high-temperature preheating smelting reduction ironmaking system according to an embodiment provided by the present application.

[0030] Among them, Figure 1 The corresponding relationship between the reference numerals in the drawings and the component names is as follows:

[0031] 10 Smelting reduction furnace, 11 Heat exchange device, 12 Hot ore screw feeder, 13 First waste heat recovery device, 14 Cyclone dust collector, 15 Second waste heat recovery device, 16 Gas dust collector, 17 Hot ore injection device, 18 Spray gun. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0032] Exemplary embodiments of the present application will be described in more detail below with reference to the accompanying drawings. Although the exemplary embodiments of the present application are shown in the drawings, it should be understood that the present application can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided so that the present application can be more thoroughly understood and the scope of the present application can be fully conveyed to those skilled in the art.

[0033] As Figure 1 shown, according to an embodiment of the present application, a high-temperature preheating smelting reduction ironmaking system is provided, including: a smelting reduction furnace 10, the smelting reduction furnace 10 is provided with a gas discharge port; a first waste heat recovery device 13, connected to the gas discharge port, for recovering the heat energy of the first-temperature gas discharged through the gas discharge port to obtain a second-temperature gas; a heat exchange device 11, connected to the first waste heat recovery device 13 and a carrier gas source, the heat exchange device 11 is used for heat exchange between the normal-temperature injection carrier gas conveyed by the carrier gas source and a part of the second-temperature gas conveyed by the first waste heat recovery device 13 to obtain a high-temperature injection carrier gas and a third-temperature gas; a second waste heat recovery device 15, connected to the first waste heat recovery device 13, for recovering the heat energy of another part of the second-temperature gas conveyed by the first waste heat recovery device 13 to obtain the third-temperature gas; a hot ore supply unit, respectively connected to the heat exchange device 11 and the smelting reduction furnace 10, the hot ore supply unit is used for providing preheated hot iron ore powder, and conveying the hot iron ore powder to the smelting reduction furnace 10 through the high-temperature injection carrier gas.

[0034] It is understandable that the high-temperature preheating smelting reduction ironmaking system provided by the embodiments of the present application is provided with a smelting reduction furnace 10, a first waste heat recovery device 13, a heat exchange device 11, a second waste heat recovery device 15, and a hot ore supply section. Among them, the smelting reduction furnace 10 is provided with a gas discharge port, and the first waste heat recovery device 13 is connected to the gas discharge port to recover and utilize the heat energy of the first-temperature gas discharged through the gas discharge port during the reduction reaction of the smelting reduction furnace 10, and obtain the second-temperature gas. The heat exchange device 11 is connected to the first waste heat recovery device 13 and the carrier gas source. The carrier gas source can transport the normal-temperature injection carrier gas to the heat exchange device 11, and at the same time, the first waste heat recovery device 13 transports a part of the second-interval temperature gas to the heat exchange device 11, so as to exchange heat between the normal-temperature injection carrier gas and the second-interval temperature gas through the heat exchange device 11 to obtain the high-temperature injection carrier gas and the third-temperature gas. The second waste heat recovery device 15 is connected to the first waste heat recovery device 13, and the first waste heat recovery device 13 transports another part of the second-interval temperature gas to the second waste heat recovery device 15, and the second waste heat recovery device 15 recovers and utilizes the heat of the second waste heat recovery device 15 to obtain the third-temperature gas. The hot ore supply section is respectively connected to the heat exchange device 11 and the smelting reduction furnace 10. The hot ore supply section can provide preheated hot iron ore powder, and transport the hot iron ore powder into the smelting reduction furnace 10 through the high-temperature injection carrier gas. With such a setting, the heat of the high-temperature gas generated by the reduction reaction can be recovered and utilized, the high-temperature injection carrier gas can be prepared while reducing energy waste. During the process of transporting the hot iron ore powder through the high-temperature injection carrier gas, the high-temperature injection carrier gas can keep the hot iron ore powder warm to reduce the heat loss of the hot iron ore powder, which is beneficial to the reduction reaction of the hot iron ore powder, reduce the coal ratio, reduce the carbon emission during the smelting reduction ironmaking process, save energy and protect the environment, and improve the ironmaking output.

[0035] It should be noted that the injection carrier gas can be selected from inert gases and gases that do not affect the reduction reaction.

[0036] In some examples, the temperature of the above-mentioned first-temperature gas is 1400°C to 1600°C; the temperature of the above-mentioned second-temperature gas is 750°C to 850°C; the temperature of the above-mentioned third-temperature gas is 150°C to 250°C.

[0037] It can be understood that the temperature of the first-temperature coal gas is the high-temperature coal gas generated by the reduction reaction, and the temperature of the first-temperature coal gas is 1400°C to 1600°C; after part of the heat is absorbed by the first waste heat recovery device 13, the first-temperature coal gas becomes the second-temperature coal gas, and the temperature of the second-temperature coal gas is 750°C to 850°C; part of the second-temperature coal gas is transported to the heat exchange device 11 to perform heat exchange with the normal-temperature injection carrier gas. After this part of the second-temperature coal gas loses heat, it becomes the third-temperature coal gas, and another part of the second-temperature coal gas becomes the third-temperature coal gas after part of the heat is absorbed by the second waste heat recovery device 15. The temperature of the third-temperature coal gas is 150°C to 250°C. Thereby, the heat utilization rate of the high-temperature coal gas is improved, and waste heat waste is reduced.

[0038] It should be noted that the first-temperature coal gas, the second-temperature coal gas, and the third-temperature coal gas are all high-pressure coal gases, and the pressure is 0.08 MPa to 0.25 MPa. Exemplarily, the second waste heat recovery device 15 can be a waste heat boiler.

[0039] In some examples, the temperature of the above-mentioned normal-temperature injection carrier gas is 0°C to 40°C; the temperature of the above-mentioned high-temperature injection carrier gas is 600°C to 700°C.

[0040] It can be understood that the temperature of the normal-temperature injection carrier gas transported to the heat exchange device 11 is 0°C to 40°C. Without setting an additional heating source, heat exchange is performed between the heat exchange device 11 and the second-temperature coal gas to heat the normal-temperature injection carrier gas to the high-temperature injection carrier gas. The temperature of the high-temperature injection carrier gas is 600°C to 700°C. Thereby, when transporting hot iron ore powder through the high-temperature injection carrier gas, the hot iron ore powder can be effectively insulated, the heat loss of the hot iron ore powder is reduced, which is beneficial to the reduction reaction of the hot iron ore powder, reduces the coal ratio, reduces the carbon emissions in the smelting reduction ironmaking process, saves energy and protects the environment, and improves the ironmaking output.

[0041] In some examples, the above-mentioned high-temperature preheating smelting reduction ironmaking system further includes: a cyclone dust removal device 14, and the input end of the cyclone dust removal device 14 is connected to the above-mentioned first waste heat recovery device 13; the output end of the cyclone dust removal device 14 is respectively connected to the above-mentioned heat exchange device 11 and the above-mentioned second waste heat recovery device 15.

[0042] It can be understood that the high-temperature preheating smelting reduction ironmaking system can also be provided with a cyclone dust removal device 14. Specifically, the input end of the cyclone dust removal device 14 is connected to the first waste heat recovery device 13; the output end of the cyclone dust removal device 14 is respectively connected to the heat exchange device 11 and the second waste heat recovery device 15. The dust content of the first-temperature coal gas generated after the reduction reaction in the smelting reduction furnace 10 is 20 g / Nm 3 to 50 g / Nm 3After the first waste heat recovery device 13 recovers and utilizes the heat of the first temperature gas, the second temperature gas is output, and the dust content of the output second temperature gas is 20 g / Nm 3 to 50 g / Nm 3 The first waste heat recovery device 13 transports the second temperature gas to the cyclone dust removal device 14 to remove some impurities in the second temperature gas and reduce the dust content of the second temperature gas to 5 g / Nm 3 to 20 g / Nm 3 to improve the purity of the gas.

[0043] It should be noted that the temperature of the second temperature gas at the input end of the cyclone dust removal device 14 is 750 °C to 850 °C. After the dust removal operation of the cyclone dust removal device 14, some heat will be lost, and the heat of the second temperature gas becomes 700 °C to 840 °C.

[0044] In some examples, as Figure 1 shown, the above high-temperature preheating smelting reduction ironmaking system further includes: a gas dust removal device 16, which is respectively connected to the above heat exchange device 11 and the above second waste heat recovery device 15, and is used for dust removal and purification of the above third temperature gas transported by the above second waste heat recovery device 15 and the above heat exchange device 11.

[0045] It can be understood that the high-temperature preheating smelting reduction ironmaking system can also be provided with a gas dust removal device 16. Specifically, the gas dust removal device 16 is respectively connected to the heat exchange device 11 and the second waste heat recovery device 15. The gas dust removal device 16 performs dust removal and purification on a part of the third temperature gas transported by the heat exchange device 11 and another part of the third temperature gas transported by the second waste heat recovery device 15 to further improve the purity of the gas, so as to output medium and low-temperature pure gas for easy use, and the medium and low-temperature pure gas can also be sold as a commodity. Specifically, the temperature of the third temperature gas is 150 °C to 250 °C, and the dust content is 5 g / Nm 3 to 20 g / Nm 3 After the dust removal operation of the gas dust removal device 16, the dust content is less than or equal to 5 mg / Nm 3 and some heat will be absorbed during the dust removal operation. The temperature of the gas output by the gas dust removal device 16 is 120 °C to 250 °C, and the pressure is 0.08 MPa to 0.25 MPa.

[0046] It can be understood that the gas dust removal device 16 can be a dry dust removal device to further reduce the energy consumption of the dust removal operation, which is beneficial to improving the gas cleanliness and further improving the energy saving of the smelting reduction.

[0047] In some examples, as Figure 1As shown in the figure, the above-mentioned hot ore supply section includes: a hot ore screw feeder 12 connected to the above-mentioned heat exchange device 11; a hot ore injection device 17 for injecting the above-mentioned hot iron ore powder into the above-mentioned hot ore screw feeder 12; and a spray gun 18 respectively connected to the above-mentioned hot ore screw feeder 12 and the smelting reduction furnace 10 for transporting the above-mentioned hot iron ore powder to the above-mentioned smelting reduction furnace 10.

[0048] It can be understood that the hot ore supply section may be provided with a hot ore screw feeder 12, a hot ore injection device 17 and a spray gun 18. Among them, the hot ore injection device 17 can inject the preheated hot iron ore powder into the hot ore screw feeder 12 and transport the hot iron ore powder into the smelting reduction furnace 10 through the spray gun 18. Specifically, the hot ore screw feeder 12 is connected to the heat exchange device 11, and the heat exchange device 11 can transport high-temperature injection carrier gas to the hot ore screw feeder 12, so as to keep the hot iron ore powder warm while transporting the hot iron ore powder through the high-temperature injection carrier gas, reduce the temperature loss of the hot iron ore powder, facilitate the reduction reaction, increase the output, reduce the coal ratio, save energy and protect the environment.

[0049] In some examples, the temperature of the above-mentioned hot iron ore powder is 600°C to 700°C, and the particle size is less than 10 mm.

[0050] It can be understood that the temperature of the hot iron ore powder transported to the screw feeder after preheating is 600°C to 700°C, and the temperature of the high-temperature injection carrier gas transported by the heat exchange device 11 is also 600°C to 700°C, so as to effectively keep the hot iron ore powder warm, reduce the heat loss of the hot iron ore powder, and make the temperature of the hot iron ore powder injected into the smelting reduction furnace 10 through the spray gun 18 greater than or equal to 600°C, which is beneficial to the reduction reaction of the hot iron ore powder, reduces the coal ratio, reduces the carbon emission in the process of smelting reduction ironmaking, saves energy and protects the environment, and increases the ironmaking output.

[0051] In some examples, the injection carrier gas stored in the above-mentioned carrier gas source is nitrogen or carbon dioxide.

[0052] It can be understood that the injection carrier gas can be selected from nitrogen or carbon dioxide. The gas has a large stock, a low price, mature transportation and storage technologies, does not affect the reduction reaction, and has high reliability.

[0053] It should be understood that the terms first, second, etc. are only used for distinguishing descriptions and cannot be understood as indicating or implying relative importance. Although the terms first, second, etc. may be used in this article to describe various units, these units should not be limited by these terms. These terms are only used to distinguish one unit from another. For example, the first unit can be called the second unit, and similarly the second unit can be called the first unit without departing from the scope of the exemplary embodiments of the present invention.

[0054] It should be understood that the term "and / or" in this text is merely a description of the association relationship between associated objects, indicating that three relationships can exist. For example, A and / or B can represent three situations: A exists alone, B exists alone, and both A and B exist simultaneously. The term " / and" in this text describes another association object relationship, indicating that two relationships can exist. For example, A / and B can represent two situations: A exists alone, and both A and B exist. Additionally, the character " / " in this text generally indicates that the associated objects before and after are in an "or" relationship.

[0055] It should be understood that in the description of the present invention, the orientation or positional relationship indicated by terms such as "upper", "vertical", "inner", "outer", etc. is the orientation or positional relationship in which the disclosed product is customarily placed during use, or the orientation or positional relationship commonly understood by those skilled in the art. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying 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 construed as a limitation on the present invention.

[0056] In the description of the present invention, it should also be noted that unless otherwise clearly specified and limited, the terms "set", "installed", "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0057] The terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments of the present invention. As used herein, the singular forms "a", "an", and "the" are intended to include the plural forms unless the context clearly indicates the contrary. It should also be understood that the terms "comprise", "comprises", "include", and / or "includes" when used herein specify the existence of the stated features, integers, steps, operations, units, and / or components, and do not preclude the existence or addition of one or more other features, quantities, steps, operations, units, components, and / or their combinations.

[0058] Specific details are provided in the following description to facilitate a complete understanding of the exemplary embodiments. However, those of ordinary skill in the art should understand that the exemplary embodiments can be implemented without these specific details. In other embodiments, well-known processes, structures, and technologies may not be shown in unnecessary detail to avoid obscuring the exemplary embodiments.

[0059] The above are only specific embodiments of the present application, enabling those skilled in the art to understand or implement the present application. Various modifications to these embodiments will be obvious to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to these embodiments shown herein, but rather to the broadest scope consistent with the principles and novel features claimed herein.

[0060] It should be noted that the information disclosed in the above background art section is only used to enhance the understanding of the background of the present disclosure, and thus may include information that does not constitute the prior art known to those of ordinary skill in the art.

Claims

1. A high-temperature preheating molten reduction ironmaking system, characterized in that: include: A smelting reduction furnace, wherein the smelting reduction furnace is provided with a gas outlet; A first waste heat recovery device, connected to the coal gas outlet, for recovering heat energy of the first temperature coal gas discharged through the coal gas outlet to obtain second temperature coal gas; a heat exchange device connected to the first waste heat recovery device and the carrier gas source, the heat exchange device being used to perform heat exchange between the normal temperature spray carrier gas delivered by the carrier gas source and part of the second temperature coal gas delivered by the first waste heat recovery device to obtain the high temperature spray carrier gas and the third temperature coal gas; a second waste heat recovery device, connected to the first waste heat recovery device, for recovering and utilizing the heat energy of another part of the second-temperature coal gas transported by the first waste heat recovery device to obtain the third-temperature coal gas; The hot ore supply part is connected to the heat exchange device and the smelting reduction furnace respectively, and is used to provide preheated hot iron ore powder, and transport the hot iron ore powder to the smelting reduction furnace through the high-temperature blowing carrier gas.

2. The high temperature preheating smelting reduction ironmaking system according to claim 1, characterized in that: The temperature of the first temperature coal gas is 1400° C. to 1600° C.; The temperature of the second temperature coal gas is 750° C. to 850° C.; The temperature of the third temperature coal gas is 150°C to 250°C.

3. The high temperature preheating smelting reduction ironmaking system according to claim 2, characterized in that: The temperature of the normal temperature sprayed carrier gas is 0°C to 40°C; The temperature of the high-temperature sprayed carrier gas is 600°C to 700°C.

4. The high temperature preheating smelting reduction ironmaking system according to claim 1, characterized in that: Also includes: A cyclone dust removal device, wherein the input end of the cyclone dust removal device is connected to the first waste heat recovery device; and the output end of the cyclone dust removal device is respectively connected to the heat exchange device and the second waste heat recovery device.

5. The high temperature preheating smelting reduction ironmaking system according to claim 4, characterized in that: The dust content of the coal gas after being treated by the cyclone dust removal device is 5g / Nm 3 ~20g / Nm 3 .

6. The high-temperature preheating smelting reduction ironmaking system according to claim 5, characterized in that: Also includes: The coal gas dust removal device is respectively connected to the heat exchange device and the second waste heat recovery device, and is used for dust removal and purification of the third temperature coal gas transported through the second waste heat recovery device and the heat exchange device.

7. The high temperature preheating smelting reduction ironmaking system according to claim 6, characterized in that: The dust content of the coal gas after being treated by the coal gas dust removal device is less than or equal to 5 mg / Nm 3 .

8. The high temperature preheating smelting reduction ironmaking system according to claim 1, characterized in that: The hot ore supply unit comprises: A hot ore screw feeder connected to the heat exchange device; A hot ore injection device, used for injecting the hot iron ore powder into the hot ore screw feeder; The spray gun is connected to the hot ore screw feeder and the smelting reduction furnace respectively, and is used to transport the hot iron ore powder to the smelting reduction furnace.

9. The high temperature preheating smelting reduction ironmaking system according to claim 8, characterized in that: The temperature of the hot iron ore powder is 600° C. to 700° C., and the particle size is less than 10 mm.

10. The high temperature preheating smelting reduction ironmaking system according to any one of claims 1 to 9, characterized in that: The carrier gas source stores nitrogen or carbon dioxide as the spraying carrier gas.

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