A high pressure tapping apparatus for a hi smelt furnace and a low carbon iron making apparatus

Abstract

This invention belongs to the field of metallurgical equipment technology, specifically relating to a high-pressure tapping device for an HIsmelt furnace and a low-carbon ironmaking device. The HIsmelt furnace high-pressure tapping device includes an HIsmelt furnace body, a preheater, a mud gun, a taphole machine, and an aeration assembly. The preheater is connected to the bottom of the HIsmelt furnace body. The HIsmelt furnace body includes a molten iron zone for holding molten iron. A tapping channel is provided on the side wall of the preheater or the side wall of the HIsmelt furnace body corresponding to the molten iron zone, penetrating through the side wall of the preheater or the HIsmelt furnace body. An aeration port is provided at the top of the preheater, communicating with the inner cavity of the preheater. The aeration assembly is connected to the aeration port. This invention, through the aeration assembly, can pressurize the space above the molten iron surface in the preheater, achieving control over the molten iron level inside the preheater, thus overcoming the limitation on the height requirements of the preheater under high-pressure production conditions.

Description

Technical Field

[0001] This invention belongs to the field of metallurgical equipment technology, specifically relating to a high-pressure tapping device for an HISmelt furnace and a low-carbon ironmaking device. Background Technology

[0002] HIsmelt smelting reduction technology is one of the core technologies for short-process ironmaking in the metallurgical industry. It has advantages such as wide raw material adaptability, low emissions, and simplified process, and has now achieved large-scale industrial application. Currently, the HIsmelt furnaces in operation worldwide operate under low-pressure conditions, with a production pressure of only about 80 kPa. The HIsmelt furnace is about 16m high, and the preheater furnace is connected to the HIsmelt furnace body, with a height of about 2m.

[0003] With the metallurgical industry's increasing demands for improved production efficiency and energy utilization, upgrading HIsmelt technology to high pressure has become an important development direction. In response to the national call for carbon reduction and emission reduction, the applicant has designed a low-carbon ironmaking device comprising a multi-layer fluidized bed and an HIsmelt furnace. The reduction of iron ore powder is achieved jointly by the multi-layer fluidized bed and the HIsmelt furnace. One advantage of this system is that the furnace gas generated by the HIsmelt furnace can be used as the reducing gas for the multi-layer fluidized bed, thereby achieving the goal of carbon reduction and emission reduction. Since the multi-layer fluidized bed requires high-pressure reducing gas, the HIsmelt furnace in this low-carbon ironmaking device needs to operate under high pressure, ensuring that the discharged furnace gas pressure is not lower than 0.2 MPa to meet the reducing gas pressure requirements of the multi-layer fluidized bed.

[0004] In order to adapt to the high-pressure production of HIsmelt furnaces, if the existing HIsmelt furnace body and pre-furnace setup is used, the height of the pre-furnace needs to be set very high to ensure that the HIsmelt furnace can tap iron normally, which will significantly increase production and maintenance costs. Therefore, there is an urgent need for a high-pressure iron tapping device for HIsmelt furnaces to adapt to the development trend of HIsmelt technology upgrading to high pressure. Summary of the Invention

[0005] To address the shortcomings of the aforementioned technologies and meet the requirements of the applicant's low-carbon ironmaking equipment, this invention provides a high-pressure tapping device for an HIsmelt furnace, employing the following technical solution: A high-pressure tapping device for a HIsmelt furnace includes the HIsmelt furnace body, a preheater, a mud gun, a taphole machine, and an aeration assembly. The pre-furnace is connected to the bottom of the HIsmelt furnace body; The HIsmelt furnace body includes a molten iron zone for holding molten iron. The side wall of the preheater or the side wall of the HIsmelt furnace body corresponding to the molten iron zone is provided with an iron tapping channel, which penetrates the side wall of the preheater or the HIsmelt furnace body. The mud gun and taphole machine are located outside the main body of the preheater or HISmelt furnace, and are set up with corresponding tapping channels. The top of the preheater is provided with an air inlet, which is connected to the inner cavity of the preheater, and the air filling component is connected to the air inlet.

[0006] Furthermore, the top of the preheater is equipped with an openable high-temperature resistant sealing structure to meet the needs of adding molten iron and slag to the preheater.

[0007] Furthermore, the top of the preheater is equipped with a radar liquid level detector. The detection end of the radar liquid level detector extends vertically into the inner cavity of the preheater, and the detection end maintains a preset safe distance from the molten iron surface inside the preheater. The radar liquid level detector is used to monitor the liquid level height inside the preheater, and the liquid level height inside the preheater can be estimated from the liquid level height inside the HIsmelt furnace body. A lance is installed in the molten pool of the HIsmelt furnace body. The lance is inserted into the slag layer; if it comes into contact with molten iron, the lifespan of the lance cannot be guaranteed. Therefore, it is necessary to know the molten iron height inside the furnace, and tap the iron when a certain height is reached to protect the lance's lifespan.

[0008] Furthermore, the tapping channel has a structure that first narrows and then widens. Specifically, the inner diameter of the tapping channel changes as follows: starting from the side closest to the pre-furnace cavity, it gradually decreases towards the center of the tapping channel, and then gradually widens from the center towards the side farther from the pre-furnace cavity, forming a streamlined channel with a continuous transition. The inner narrowing is to strengthen the sealing of the mud spraying, while the outer widening is to prevent the molten iron from corroding the refractory material.

[0009] Furthermore, the mud gun includes a mud gun head, which adopts a dual-channel mud spraying structure, including a coaxially arranged intermediate mud spraying channel and an outer annular mud spraying channel. The structure and mud spraying method of the intermediate mud spraying channel are consistent with the mud spraying channel of a traditional mud gun head. The outer annular mud spraying channel surrounds the outer periphery of the intermediate mud spraying channel, and its inner wall and the outer wall of the intermediate mud spraying channel form an annular mud spraying cavity. The outlet of the annular mud spraying cavity is flush with the outlet end face of the intermediate mud spraying channel.

[0010] Furthermore, the inflation assembly includes a high-pressure gas tank, an inflation pipeline, and a control valve. One end of the inflation pipeline is connected to the high-pressure gas tank, and the other end is sealed to the inflation port. The control valve is located on the inflation pipeline.

[0011] Furthermore, the inflation assembly also includes a pressure sensor and a controller, the pressure sensor being located inside the pre-furnace, and the controller being connected to a control valve.

[0012] Furthermore, a pressure relief port is provided on the top of the preheater, and a safety pressure relief valve is provided at the pressure relief port.

[0013] Furthermore, the inner wall of the iron outlet channel is provided with a fire-resistant lining.

[0014] Furthermore, the number of gas filling ports is at least one, and when there are multiple gas filling ports, the gas filling ports are evenly distributed on the top of the pre-furnace.

[0015] The present invention also discloses a low-carbon ironmaking apparatus, including a fluidized bed system and any of the above-described HIsmelt furnace high-pressure tapping devices. The fluidized bed system includes a fluidized bed feed pipe, a fluidized bed discharge pipe, a fluidized bed air inlet, and a fluidized bed air outlet. The HIsmelt furnace body of the high-pressure tapping device for the HIsmelt furnace consists of, from bottom to top, a molten iron zone, a slag liquid zone, and a furnace chamber zone. The HIsmelt furnace high-pressure tapping device also includes a solid material lance, an oxygen lance, and a furnace gas outlet. The nozzle of the solid material lance is inserted below the slag liquid surface in the slag liquid zone, and the oxygen lance is inserted into the furnace chamber zone from the upper part of the HIsmelt furnace body. The fluidized bed discharge pipe is connected to the solid material spray gun of the HIsmelt furnace high-pressure tapping device, and the furnace gas outlet of the HIsmelt furnace high-pressure tapping device is connected to the fluidized bed gas inlet. The HIsmelt furnace high-pressure tapping device of this invention can deliver high-pressure reducing gas into the fluidized bed system.

[0016] Iron-containing raw materials, such as iron ore powder, undergo a reduction reaction to a certain extent within a fluidized bed system, with the degree of reduction being any value less than 100%. The reduced iron ore powder in the fluidized bed system enters the HIsmelt furnace high-pressure tapping device through the fluidized bed discharge pipe and solid material spray gun. The incompletely reduced coarse ore powder undergoes final reduction and melting within the HIsmelt furnace high-pressure tapping device, using pulverized coal as the reducing agent, while simultaneously generating CO to supply the fluidized bed system. Theoretically, if only coal added to the HIsmelt furnace high-pressure tapping device is used as the reducing agent, with the fluidized bed system and the molten reduction furnace system each handling 50% of the reduction work, no other reducing gas source is needed, achieving material balance in the entire production process and reducing carbon emissions to a certain extent.

[0017] Furthermore, the oxygen lance is internally equipped with an oxygen-containing gas channel and a pulverized coal channel. Using an oxygen lance with a pulverized coal channel allows the combustion-supporting gas to burn with the pulverized coal injected from the molten pool, rather than with the CO produced in the molten pool. This offers three advantages: 1. It provides a higher calorific value, and since pure oxygen contains no nitrogen, the wasted heat is carried away by the nitrogen; 2. The furnace gas produced by the HIsmelt furnace high-pressure tapping device has a high CO concentration and a higher reducing potential, which is beneficial for improving fluidized bed efficiency; 3. The coal injected into the molten pool as a reducing agent requires high quality, while the coal injected from the oxygen-containing gas and pulverized coal lance, used only as fuel to provide heat, has lower quality requirements, resulting in better economic efficiency.

[0018] By adopting the above technical solution, the beneficial effects of the present invention are as follows: The high-pressure tapping device for the HIsmelt furnace of the present invention, by setting an air inlet at the top of the preheater, the air inlet being connected to the inner cavity of the preheater, and the air filling component being connected to the air inlet, pressurizes the space above the liquid surface in the preheater, thereby controlling the liquid level height in the preheater. Therefore, it breaks through the limitation of the preheater height requirement under high-pressure production conditions, and also avoids corrosion of the top of the preheater, achieving stable and safe production. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the high-pressure tapping device of the HIsmelt furnace in Embodiment 1 of the present invention. Figure 2 This is a schematic diagram of the overall structure of the low-carbon ironmaking device according to Embodiment 2 of the present invention; Figure 3 This is a schematic diagram of the high-pressure tapping device of the HIsmelt furnace in Embodiment 3 of the present invention.

[0020] In the diagram: 1-Multi-layer fluidized bed, 2-Hismelt furnace high-pressure tapping device, 3-Ore injection system, 4-Oxygen supply system, 5-Coal supply system, 6-Slag treatment system, 7-Iron treatment system, 8-Gas treatment system, 10-Raw material processing system, 101-Fluorescent bed feed pipe, 102-Fluorescent bed discharge pipe, 103-Gas distribution chamber, 104-Fluorescent bed air inlet, 105-Fluorescent bed air outlet, 106-Lower... Material pipe, 107-Gas distribution plate, 108-Cyclone dust collector, 201-Solid material spray gun, 202-Oxygen spray gun, 203-Exhaust hood, 204-Slag liquid zone, 205-Iron liquid zone, 206-Gas filling port, 207-Radar liquid level detector, 208-High temperature resistant cover, 209-Iron tapping channel, 210-Preheat furnace, 211-Mud bubble, 212-Iron tapping machine, 213-HIsmelt furnace body. Detailed Implementation

[0021] To enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0022] Example 1 like Figure 1 , Figure 2 As shown, this embodiment discloses a high-pressure tapping device for an HIsmelt furnace, including an HIsmelt furnace body 213, a preheater 210, a mud gun 211, a taphole machine 212, and an aeration assembly 206. The preheater 210 is connected to the bottom of the HIsmelt furnace body 213. The side wall of the preheater 210 is provided with an iron tapping channel 209, which penetrates the side wall of the preheater 210. The iron tapping channel 209 has a structure that first narrows and then widens. The inner wall of the iron tapping channel 209 is provided with a refractory lining.

[0023] The top of the preheater 210 is provided with an air inlet 206, an openable high-temperature resistant sealing structure 208, a radar liquid level detector 207, and a pressure release port. The air filling assembly includes a high-pressure gas tank, a gas supply pipeline, a control valve, a pressure sensor, and a controller. The high-pressure gas tank is sealed to the air inlet 206 via the gas supply pipeline. The pressure sensor is located inside the preheater 210. The control valve is located on the gas supply pipeline. The controller is signal-connected to the pressure sensor and the controller. The openable high-temperature resistant sealing structure 208 is a high-temperature resistant cover (the high-temperature resistant cover can be located in a portion of the top of the preheater 210, or it can completely cover the top area of ​​the preheater 210; in this embodiment, the high-temperature resistant cover completely covers the top of the preheater 210). In the preheating area, the gas filling port 206 and the pressure relief port are located on the high-temperature resistant cover. The radar liquid level detector 207 extends from the high-temperature resistant cover into the preheating furnace, and the radar liquid level detector 207 is sealed to the high-temperature resistant cover. The connection between the high-temperature resistant cover and the furnace body of the preheating furnace 210 is an openable sealed connection, such as a detachable structure or an openable rotating cover structure. The detection end of the radar liquid level detector 207 extends vertically into the inner cavity of the preheating furnace 210, and the detection end maintains a preset safe distance from the molten iron surface in the preheating furnace 210. A safety pressure relief valve is provided at the pressure relief port.

[0024] The mud gun 211 and the taphole machine 212 are located outside the preheater 210 and are positioned corresponding to the tapping channel 209. The mud gun 211 includes a mud gun head, which adopts a dual-channel mud spraying structure, including a coaxially arranged intermediate mud spraying channel and an outer annular mud spraying channel. The outer annular mud spraying channel surrounds the outer periphery of the intermediate mud spraying channel, and its inner wall and the outer wall of the intermediate mud spraying channel form an annular mud spraying cavity. The outlet of the annular mud spraying cavity and the outlet of the intermediate mud spraying channel are arranged at the same end face.

[0025] By opening the openable high-temperature resistant sealing structure 208, molten iron, slag, etc., can be added into the HIsmelt furnace high-pressure tapping device 2. During the operation of the HIsmelt furnace high-pressure tapping device 2, the pressure inside the HIsmelt furnace high-pressure tapping device 2 is relatively high. In this embodiment, the gas filling component 206 pressurizes the pre-furnace 210 (pressurizes the space between the molten iron surface inside the pre-furnace 210 and the top of the pre-furnace 210), controlling the pressure above the molten iron surface inside the pre-furnace 210 to be basically consistent with the pressure inside the HIsmelt furnace body, thus avoiding the molten iron surface from contacting the top of the pre-furnace 210, thereby preventing furnace top corrosion and peeling accidents. At the same time, the present invention can control the height of molten iron inside the pre-furnace 210, thus breaking through the limitation of the height requirement of the pre-furnace 210 under high-pressure production conditions.

[0026] like Figure 2 As shown, the slag slurry zone inside the HIsmelt furnace high-pressure tapping device 2 is equipped with a solid material spray gun 202 for conveying pre-reduced materials and coal into the HIsmelt furnace high-pressure tapping device. To avoid corrosion of the solid material spray gun 202 by molten iron, this embodiment uses a radar liquid level detector 207 to monitor the molten iron position in real time. When the molten iron content in the HIsmelt furnace high-pressure tapping device 2 is too high, the tapping channel 209 is opened by the tapping machine 212 to discharge some molten iron. Then, the tapping channel 209 is blocked by the mud gun 211.

[0027] Example 2 like Figure 1 , Figure 2 As shown, this embodiment discloses a low-carbon ironmaking apparatus, including a fluidized bed system, a HIsmelt furnace high-pressure tapping device 2, an ore injection system 3, an oxygen supply system 4, a coal supply system 5, a slag treatment system 6, a molten iron treatment system 7, a gas treatment system 8, and a raw material treatment system 10.

[0028] The fluidized bed system is a multi-layer fluidized bed 1. In this embodiment, the multi-layer fluidized bed 1 has 4 bed layers, each of which is a bubbling bed. The multi-layer fluidized bed 1 is equipped with a fluidized bed feed pipe 101, a fluidized bed discharge pipe 102, a fluidized bed air inlet 104, and a fluidized bed air outlet 105. The fluidized bed feed pipe 101 and the fluidized bed air outlet 105 are located on the top fluidized bed layer. The fluidized bed feed pipe 101 is also connected to the raw material processing system 10. Each fluidized bed layer has an air distribution plate 107 at the bottom. The air distribution plate 107 uses a wind cap structure. Adjacent fluidized bed layers are fed through a feed pipe 106. The fluidized bed discharge pipe 102 is located on the bottom fluidized bed layer. Below the bottom fluidized bed layer is a gas distribution chamber 103. The fluidized bed air inlet 104 is located on the gas distribution chamber 103.

[0029] The multi-layer fluidized bed 1 is provided with a cyclone dust collector 108 on the outside. The air inlet of the cyclone dust collector 108 is connected to the air outlet 105 of the fluidized bed. The discharge outlet of the cyclone dust collector 108 is divided into two branches, one of which is connected to the top fluidized bed layer, and the other is connected to the fluidized bed discharge pipe 102 outside the bed body.

[0030] The HIsmelt furnace body 213 of the HIsmelt furnace high-pressure tapping device 2 also includes, from bottom to top, a molten iron zone 205, a slag liquid zone 204 and a furnace zone, an oxygen lance 202 (with an oxygen-containing gas channel and a pulverized coal channel), a bottom tapping port, a slag outlet, a waste gas hood 203 and a furnace gas outlet.

[0031] Two solid material spray guns 201 are inserted from the furnace zone, with the nozzles below the slag-liquid surface in the slag-liquid zone 204; the oxygen spray gun 202 enters the furnace zone from the upper part of the furnace body; a furnace wall air-cooling device is provided on the furnace body corresponding to the lower part of the furnace zone, and the furnace wall air-cooling device is connected to the fluidized bed outlet 105. The cooling air comes from the purified exhaust gas discharged from the fluidized bed and is recycled back.

[0032] The slag outlet is located on the furnace side wall corresponding to the slag liquid zone 204 and is connected to the slag treatment system 6. The bottom iron outlet is located on the furnace side wall corresponding to the molten iron zone 205 and is connected to the pre-furnace ( Figure 1 (Not shown in the image) The preheater is equipped with an iron tapping channel, which is connected to the molten iron treatment system 7. The exhaust hood 203 is located on the upper part of the furnace body, and the furnace gas outlet is located on the exhaust hood 203.

[0033] The fluidized bed discharge pipe 102 of the multi-layer fluidized bed 1 is connected to the solid material spray gun 201, and the mineral material blowing system 3 is installed on the connecting pipe.

[0034] The coal supply system 5 is connected to the solid material spray gun 201 and the oxygen spray gun 202 respectively. The oxygen spray gun 202 is also connected to the oxygen generation system 4, which can be an oxygen generator.

[0035] The furnace gas outlet of the HIsmelt furnace high-pressure tapping device 2 is connected to the fluidized bed inlet 104 of the multi-layer fluidized bed 1. As a preferred embodiment, a second reducing gas source (not shown in the figure) is also provided on the connecting pipe. The outlet of the second reducing gas source is provided with a reducing gas heating device, which is a hydrogen heating furnace.

[0036] The outlet of the cyclone dust collector 108 is connected to the gas treatment system 8, the gas treatment system 8 is connected to the fluidized bed inlet 104, and the furnace gas outlet is also connected to the gas treatment system 8.

[0037] The low-carbon ironmaking method using the low-carbon ironmaking apparatus of this embodiment is as follows: The crude iron ore is first heated and dried by the raw material processing system 10, and then enters the multi-layer fluidized bed 1, where it is pre-reduced by CO in the furnace gas and hydrogen from the second reducing gas source, achieving a reduction degree of 70%. The reduced material with a certain degree of reduction is fed into the HIsmelt furnace high-pressure tapping device 2 through the solid material spray gun 201 of the ore injection system 3 (pneumatic conveying) for final reduction, and then melted to form molten iron and slag for discharge.

[0038] The oxygen lance 202 of the HIsmelt furnace high-pressure tapping device 2 uses pure oxygen produced by an oxygen generator during operation, and the coal supplied to the oxygen lance 202 is low-priced bituminous coal. The carrier gas of the ore injection system 3 is cold coal gas that has been purified, dehydrated and CO2 removed from the fluidized bed tail gas and recycled back. After being pressurized, the pre-reduced ore and anthracite pulverized coal used for reduction in the molten pool are injected into the HIsmelt furnace high-pressure tapping device 2.

[0039] The furnace gas produced by the HIsmelt furnace high-pressure tapping device 2 is mixed with the cold circulating gas sprayed from the furnace wall air-cooling device, and then mixed with heated hydrogen gas to enter the fluidized bed as fluidizing air to heat, dry and reduce the ore.

[0040] The exhaust gas from the multi-layer fluidized bed 1 enters the cyclone dust collector 108 through the fluidized bed outlet 105. Part of the material collected by the cyclone dust collector 108 is returned to the top fluidized bed layer, and the remaining part is combined with the material discharged from the fluidized bed outlet pipe 102 and then sent to the HIsmelt furnace high-pressure tapping device 2. The exhaust gas discharged from the cyclone dust collector 108 enters the gas purification system 8. Part of it is discharged externally, and the remaining part is combined with the furnace gas discharged from the furnace gas outlet and then circulated back to the multi-layer fluidized bed 1. A portion of the furnace gas discharged from the furnace gas outlet can also be sent to the gas purification system 8 for purification treatment. The gas purified by the gas purification system 8 can also be discharged externally.

[0041] As can be seen from the above scheme, the reducing gas of the multi-layer fluidized bed 1 in the low-carbon ironmaking device of this embodiment can be partially or entirely derived from the furnace gas of the HIsmelt furnace high-pressure tapping device 2. As those skilled in the art know, the reducing gas pressure required for reducing iron ore powder using a multi-layer fluidized bed is generally not less than 0.2 MPa. Therefore, the HIsmelt furnace high-pressure tapping device 2 of this embodiment can be well adapted to the production needs of the multi-layer fluidized bed 1 in this device.

[0042] It should be noted that, Figure 1 The purpose is to clearly show the location and structure of the pre-furnace of the HIsmelt furnace high-pressure tapping device 2; therefore, other details such as the exhaust hood of the HIsmelt furnace high-pressure tapping device 2 are not shown. Figure 2The purpose is to clearly show the position and connection relationship between the multi-layer fluidized bed and the HIsmelt furnace high-pressure tapping device 2 in the low-carbon ironmaking unit, therefore the pre-furnace and other structures of the HIsmelt furnace high-pressure tapping device 2 are not shown.

[0043] Example 3 like Figure 3 As shown, this embodiment discloses a high-pressure tapping device for an HIsmelt furnace. The only difference from Embodiment 1 is that the tapping channel 209 is located on the side wall corresponding to the molten iron zone 205 of the HIsmelt furnace body 213.

[0044] The above embodiments are only preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Various modifications and improvements made by those skilled in the art to the technical aspects of the present invention without departing from the spirit of the present invention should fall within the protection scope defined by the claims of the present invention.

Claims

1. A high-pressure tapping device for an HIsmelt furnace, characterized in that, Includes the HIsmelt furnace body, preheater, mud gun, taphole machine, and gas filling assembly. The pre-furnace is connected to the bottom of the HIsmelt furnace body; The HIsmelt furnace body includes a molten iron zone for holding molten iron. The side wall of the preheater or the side wall of the HIsmelt furnace body corresponding to the molten iron zone is provided with an iron tapping channel, which penetrates the side wall of the preheater or the HIsmelt furnace body. The mud gun and taphole machine are located outside the main body of the preheater or HISmelt furnace, and are set up with corresponding tapping channels. The top of the preheater is provided with an air inlet, which is connected to the inner cavity of the preheater, and the air filling component is connected to the air inlet.

2. The high-pressure tapping device for the HIsmelt furnace according to claim 1, characterized in that, The top of the preheater is equipped with an openable high-temperature resistant sealing structure.

3. The high-pressure tapping device for the HIsmelt furnace according to claim 1, characterized in that, The top of the preheater is also equipped with a radar liquid level detector. The detection end of the radar liquid level detector extends vertically into the inner cavity of the preheater, and the detection end maintains a preset safe distance from the molten iron surface in the preheater.

4. The high-pressure tapping device for the HIsmelt furnace according to claim 1, characterized in that, The iron outlet channel has a structure that first narrows and then widens.

5. The high-pressure tapping device for the HIsmelt furnace according to claim 1, characterized in that, The mud gun includes a mud gun head, which adopts a dual-channel mud spraying structure, including a coaxially arranged intermediate mud spraying channel and an outer annular mud spraying channel; the outer annular mud spraying channel surrounds the outer periphery of the intermediate mud spraying channel, and its inner wall and the outer wall of the intermediate mud spraying channel form an annular mud spraying cavity, and the outlet of the annular mud spraying cavity is flush with the outlet end face of the intermediate mud spraying channel.

6. The high-pressure tapping device for the HIsmelt furnace according to claim 1, characterized in that, The inflation assembly includes a high-pressure gas tank, an inflation pipeline, and a control valve. One end of the inflation pipeline is connected to the high-pressure gas tank, and the other end is sealed to the inflation port. The control valve is located on the inflation pipeline.

7. The high-pressure tapping device for the HIsmelt furnace according to claim 6, characterized in that, The inflation assembly also includes a pressure sensor and a controller. The pressure sensor is located inside the pre-furnace, and the controller is connected to the control valve.

8. The high-pressure tapping device for the HIsmelt furnace according to claim 1, characterized in that, It also includes one or more of the following features: The top of the preheater is also provided with a pressure relief port, and a safety pressure relief valve is provided at the pressure relief port; The inner wall of the iron tapping channel is provided with a fire-resistant lining. The number of gas inlets is at least one, and when there are multiple gas inlets, the gas inlets are evenly distributed on the top of the pre-furnace.

9. A low-carbon ironmaking apparatus, characterized in that, The system includes a fluidized bed system and the high-pressure tapping device for the HIsmelt furnace as described in any one of claims 1 to 9. The fluidized bed system includes a fluidized bed feed pipe, a fluidized bed discharge pipe, a fluidized bed air inlet, and a fluidized bed air outlet. The HIsmelt furnace body of the high-pressure tapping device for the HIsmelt furnace consists of, from bottom to top, a molten iron zone, a slag liquid zone, and a furnace chamber zone. The HIsmelt furnace high-pressure tapping device also includes a solid material lance, an oxygen lance, and a furnace gas outlet. The nozzle of the solid material lance is inserted below the slag liquid surface in the slag liquid zone, and the oxygen lance is inserted into the furnace chamber zone from the upper part of the HIsmelt furnace body. The fluidized bed discharge pipe is connected to the solid material spray gun of the HIsmelt furnace high-pressure tapping device, and the furnace gas outlet of the HIsmelt furnace high-pressure tapping device is connected to the fluidized bed gas inlet.

10. The low-carbon ironmaking apparatus according to claim 9, characterized in that, The oxygen spray gun has an oxygen-containing gas channel and a coal powder channel inside.

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