System for preparing high-purity iron powder by utilizing renewable energy based on multi-stage fluidization reduction
Through multi-stage fluidization reduction and plasma heating technology, high-purity iron powder is produced using biomass natural gas, which solves the problems of high carbon emissions and low purity in traditional iron powder preparation methods, and achieves low-carbon and efficient iron powder production.
Patent Information
- Application Number
- CN202422382723.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-29
- Publication Date
- 2025-08-15
- Estimated Expiration
- 2034-09-29
AI Technical Summary
Traditional iron powder production methods rely on fossil fuels, resulting in high carbon emissions and difficult purity and quality control, which cannot meet the needs of environmentally friendly and high-performance materials.
Multi-stage fluidization reduction technology is used to combine biomass natural gas and plasma generators and heating technology, and high-purity iron powder is produced using renewable energy, including multi-stage fluidization reduction components, circulating gas supply and recovery components and nitrogen supply components. The iron powder is finely processed through biomass reducing gas preparation, purification and multi-stage fluidization reduction reactions.
It has achieved efficient, low-carbon and clean production of high-purity iron powder, with a TFe grade of more than 98%, meeting the needs of high-end manufacturing.
Smart Images
Figure CN223222468U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the cross-technical field of green metallurgical engineering and new energy utilization, and in particular provides a system for producing high-purity iron powder by utilizing renewable energy based on multi-stage fluidized reduction. Background Art
[0002] Iron powder is a key raw material in modern industrial production, widely used in fields such as machinery, electronics, and chemicals. However, traditional methods for producing iron powder often rely on fossil fuels as an energy source, which not only results in significant carbon emissions but also presents bottlenecks in iron powder purity and quality control. With the growing demand for environmentally friendly and high-performance materials, the development of a new technology to produce low-carbon, high-purity iron powder using renewable energy is of great practical significance. Utility Model Content
[0003] In order to solve the above technical problems, the utility model provides a system for producing high-purity iron powder based on multi-stage fluidized reduction using renewable energy. It combines fluidized gas-based reduction and plasma generator heating technology, uses biomass natural gas as the reducing gas, and realizes efficient, low-carbon and clean production of reduced iron powder.
[0004] The utility model is achieved by providing a system for producing high-purity iron powder based on multi-stage fluidized reduction using renewable energy, comprising a multi-stage fluidized reduction assembly, a circulating gas supply and recovery assembly, and a nitrogen supply assembly. The multi-stage fluidized reduction assembly comprises a circulating fluidized preheater, a primary circulating fluidized reduction reactor, a secondary circulating fluidized reduction reactor, and a circulating fluidized cooler connected in sequence. The circulating gas supply assembly comprises a first gas mixing device, a waste heat boiler, a circulating gas purification system, a circulating gas MDEA decarbonization system, and a circulating gas heater connected in sequence. The first gas mixing device is respectively connected to the circulating gas inlets at the lower ends of the primary circulating fluidized reduction reactor and the secondary circulating fluidized reduction reactor, the circulating gas outlets at the upper ends of the primary circulating fluidized reduction reactor and the secondary circulating fluidized reduction reactor are both connected to the waste heat boiler, and the outlet of the circulating gas heater is connected to the first gas mixing device. The nitrogen supply assembly comprises a nitrogen storage device and a cooling gas purification system. The nitrogen storage device is connected to the cooling gas inlet at the lower end of the circulating fluidized cooler, the cooling gas outlet at the upper end of the circulating fluidized cooler is connected to the cooling gas purification system, and the cooling gas purification system is connected to the nitrogen storage device.
[0005] Preferably, it also includes a refined iron powder preparation component, which includes a refined iron ore storage device, a crusher, a grinding mill, a weak magnetic separator and a flotation component connected in sequence, and the refined iron powder outlet of the flotation component is connected to the refined iron powder inlet of the circulating fluidized bed preheater.
[0006] It is further preferred that the flotation assembly includes a flotation roughing device, a first flotation cleaning device, a second flotation cleaning device, a third flotation cleaning device, a fourth flotation cleaning device, a super fine iron powder storage device and an ordinary fine iron powder storage device connected in sequence, the ordinary fine iron powder outlet of each flotation cleaning device is connected to the ordinary fine iron powder storage device, the super fine iron powder outlet of the fourth flotation cleaning device is connected to the super fine iron powder storage device, and the ordinary fine iron powder storage device and the super fine iron powder storage device are connected to the fine iron powder inlet of the circulating fluidized bed preheater.
[0007] Further preferably, the circulating gas supply and recovery component also includes a circulating gas generation component, which includes a biomass reducing gas preparation system, a reducing gas purification system, a reducing gas conversion system, a reducing gas MDEA decarbonization system, a reducing gas storage cabinet, a second gas mixing device, a heating furnace and a plasma generator; the biomass reducing gas preparation system, the reducing gas purification system, the reducing gas conversion system, the reducing gas MDEA decarbonization system, the reducing gas storage cabinet, the second gas mixing device, the heating furnace and the plasma generator are connected in sequence, and the reducing gas purification system is also connected to the heating furnace; the plasma generator is connected to the first gas mixing device; and the nitrogen storage device is also connected to the first gas mixing device.
[0008] Further preferably, the heating furnace and the preheating gas inlet at the lower end of the circulating fluidized bed preheater, and the preheating gas outlet at the upper end of the circulating fluidized bed preheater are connected to an exhaust gas treatment system.
[0009] Further preferably, the nitrogen supply assembly also includes a nitrogen generating assembly, the nitrogen generating assembly includes an electrolytic water system and an air separation system, the oxygen outlets of the electrolytic water system and the air separation system are connected to an oxygen storage device, the hydrogen outlet of the electrolytic water system is connected to a hydrogen storage device, the hydrogen storage device is connected to the second gas mixing device, and the nitrogen outlet of the air separation system is connected to the nitrogen storage device.
[0010] Further preferably, the energy of the water electrolysis system and the air separation system comes from a wind power system and a photovoltaic system.
[0011] Further preferably, the high-purity iron powder outlet of the circulating fluidized bed cooler is connected to a packaging system, and the packaging system is connected to a high-purity iron powder storage device.
[0012] Compared with the prior art, the advantages of the present invention are:
[0013] This utility model provides a system for producing high-purity iron powder using renewable energy through multi-stage fluidized bed reduction. By efficiently integrating renewable energy collection and conversion, advanced gas preparation and purification, multi-stage fluidized bed reduction reactions, and a sophisticated iron powder collection and processing process, it can stably and efficiently produce low-carbon, high-purity iron powder that meets the needs of high-end manufacturing. In today's world of increasing energy scarcity and rising environmental protection requirements, the development of new, efficient, low-carbon, high-purity iron powder production methods is of great significance. BRIEF DESCRIPTION OF THE DRAWINGS
[0014] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments:
[0015] Figure 1 This is a schematic structural diagram of the utility model. DETAILED DESCRIPTION
[0016] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.
[0017] refer to Figure 1 The utility model provides a system for producing high-purity iron powder by utilizing renewable energy based on multi-stage fluidized reduction, characterized in that it comprises a multi-stage fluidized reduction component, a circulating gas supply and recovery component and a nitrogen supply component. The multi-stage fluidized reduction component comprises a circulating fluidized preheater 12, a primary circulating fluidized reduction reactor 13, a secondary circulating fluidized reduction reactor 14 and a circulating fluidized cooler 15 connected in sequence. The circulating gas supply component comprises a first gas mixing device 20, a waste heat boiler 16, a circulating gas purification system 17, a circulating gas MDEA decarbonization system 18 and a circulating gas heater 19 connected in sequence. The first gas mixing device 20 is respectively connected to the primary circulating gas preheater 12, a primary circulating fluidized reduction reactor 13, a secondary circulating fluidized reduction reactor 14 and a circulating fluidized cooler 15. The circulating gas inlets at the lower ends of the circulating fluidized reduction reactor 13 and the secondary circulating fluidized reduction reactor 14 are connected, the circulating gas outlets at the upper ends of the primary circulating fluidized reduction reactor 13 and the secondary circulating fluidized reduction reactor 14 are both connected to the waste heat boiler 16, and the outlet of the circulating gas heater 19 is connected to the first gas mixing device 20; the nitrogen supply assembly includes a nitrogen storage device 33 and a cooling gas purification system 34, the nitrogen storage device 33 is connected to the cooling gas inlet at the lower end of the circulating fluidized cooler 15, the cooling gas outlet at the upper end of the circulating fluidized cooler 15 is connected to the cooling gas purification system 34, and the cooling gas purification system 34 is connected to the nitrogen storage device 33.
[0018] During the working process of the present invention, after the raw material refined iron ore is processed into refined iron powder, it first enters the circulating fluidized preheater 12 to preheat the material. The preheated refined iron powder enters the primary circulating fluidized reduction reactor 13 and the secondary circulating fluidized reduction reactor 14 in sequence to fully contact with the reducing gas and undergo a circulating fluidized reduction reaction. The reaction temperature is controlled between 800 and 900°C and the reaction time is 8 to 10 hours. In the circulating fluidized reduction reaction, the reducing gas (CO, H2) coming out of the first gas mixing device 20 enters from below the primary circulating fluidized reduction reactor 13 and the secondary circulating fluidized reduction reactor 14 and undergoes a reduction reaction with the refined iron powder from top to bottom. The circulating gas after the reaction from bottom to top passes through the cyclone separator and is sent to the upper outlet through the channel. Waste heat boiler 16 recovers waste heat. This post-reaction gas, carrying CO2 and H2O (g), enters circulating gas purification system 17 for dust removal, impurity removal, and dehydration. The purified circulating gas enters circulating gas MDEA decarbonization system 17 for carbon dioxide removal. After being heated by circulating gas heater 19, it returns to first gas mixing device 20. The reduced metallic Fe powder is fed to circulating fluidized bed cooler 15 and cooled to room temperature. The cooling method uses inert nitrogen circulating cooling. Nitrogen is collected from nitrogen storage device 33 and piped into the bottom of circulating fluidized bed cooler 15, where it exchanges heat with the refined iron powder flowing downward. After heat exchange, the nitrogen is discharged from the top of circulating fluidized bed cooler 15 and enters cooling gas purification system 34 for purification, cooling, and recycling. The cooled high-purity iron ore concentrate product has a TFe grade exceeding 98%.
[0019] In order to prepare fine iron powder, the system also includes a fine iron powder preparation component, which includes a fine iron ore storage device 1, a crusher 2, a grinding mill 3, a weak magnetic separator 4 and a flotation component connected in sequence. The fine iron powder outlet of the flotation component is connected to the fine iron powder inlet of the circulating fluidized bed preheater 12.
[0020] Preferably, the flotation assembly includes a flotation roughing device 5, a first flotation cleaning device 6, a second flotation cleaning device 7, a third flotation cleaning device 8, a fourth flotation cleaning device 9, a super fine iron powder storage device 10 and an ordinary fine iron powder storage device 11 connected in sequence, the ordinary fine iron powder outlet of each flotation cleaning device is connected to the ordinary fine iron powder storage device 11, the super fine iron powder outlet of the fourth flotation cleaning device 9 is connected to the super fine iron powder storage device 10, and the ordinary fine iron powder storage device 11 and the super fine iron powder storage device 10 are connected to the fine iron powder inlet of the circulating fluidized bed preheater 12.
[0021] The refined iron ore storage device 1 transports the refined iron ore frames via a belt to the crusher 2, where the large lumps of iron ore are broken into smaller pieces for subsequent processing. High-efficiency jaw crushers or cone crushers are used to ensure uniform particle size after crushing. The crushed iron ore enters the grinding mill 3 for grinding to the desired particle size. Advanced ball milling equipment can be used to adjust the milling time and ball-to-material ratio to control the particle size of the iron ore powder to between 300 and 400 mesh. After ball milling, the iron ore powder is transported via conveyors such as belt conveyors to a weak magnetic separator 4 and flotation assembly for weak magnetic tailing removal. This process involves magnetic screening and then reverse flotation. The fine iron powder separated by the weak magnetic separator 4 sequentially enters a roughing flotation unit 5, a first flotation concentrator 6, a second flotation concentrator 7, a third flotation concentrator 8, and a fourth flotation concentrator 9. Reverse flotation uses dodecylamine as a gangue collector under alkaline conditions. The separated products are ordinary fine iron powder with a TFe grade of 68%, which is stored in an ordinary fine iron powder storage unit 11, and super fine iron powder with a TFe grade of 71%, which is stored in a super fine iron powder storage unit 10. The ordinary fine iron powder with a TFe grade of 68% and the super fine iron powder with a TFe grade of 71% are transported to a circulating fluidized bed preheater 12 via conveyors and bucket elevators.
[0022] In order to prepare circulating gas, the circulating gas supply and recovery component also includes a circulating gas generation component, which includes a biomass reducing gas preparation system 24, a reducing gas purification system 25, a reducing gas conversion system 26, a reducing gas MDEA decarbonization system 27, a reducing gas storage cabinet 28, a second gas mixing device 23, a heating furnace 21 and a plasma generator 22; the biomass reducing gas preparation system 24, the reducing gas purification system 25, the reducing gas conversion system 26, the reducing gas MDEA decarbonization system 27, the reducing gas storage cabinet 28, the second gas mixing device 23, the heating furnace 21, and the plasma generator 22 are connected in sequence, and the reducing gas purification system 25 is also connected to the heating furnace 21; the plasma generator 22 is connected to the first gas mixing device 20; and the nitrogen storage device 33 is also connected to the first gas mixing device 20.
[0023] The biomass reducing gas preparation system 24 generates biomass reducing gas through processes such as biomass waste pretreatment, vacuum drying, and cracking gasification. The biomass reducing gas first enters the reducing gas purification system 25 for desulfurization and dust removal, and then enters the reducing gas conversion system 26 for CO conversion, adjusting the H2 / CO ratio to ≥1.5. The converted gas enters the reducing gas MDEA decarbonization system 27 to remove carbon dioxide, and the treated reducing gas is transported to the reducing gas storage cabinet 28 for storage; the reducing gas stored in the reducing gas storage cabinet 28 is transported to the second gas mixing device 23 and sent to the heating furnace 21 for preheating. The heated reducing gas enters the plasma generator 22 for plasma formation. The active free radicals in the plasma (such as hydrogen free radicals, oxygen free radicals, etc.) can undergo a strong chemical reaction with the iron oxides in the iron ore. These free radicals have unpaired electrons and are highly chemically active. They can attack the chemical bonds of iron oxides. At the same time, the plasma state provides the temperature required for the fluidized reduction reaction. The plasma-enhanced reducing gas enters the first gas mixing device 20 as a supplementary fresh gas, and the nitrogen from the nitrogen storage device 33 also enters the first gas mixing device 20, and together they serve as reducing gas to supply the multi-stage circulating fluidized reduction reaction. The addition of nitrogen can adjust the flow rate and pressure of the entire gas, making the airflow more stable, which helps to regulate the temperature of the reaction system and avoid problems such as uneven particle fluidization and local overheating caused by fluctuations in the gas flow rate.
[0024] In order to provide preheating gas to the circulating fluidized bed preheater 12 , the heating furnace 21 and the preheating gas inlet at the lower end of the circulating fluidized bed preheater 12 and the preheating gas outlet at the upper end of the circulating fluidized bed preheater 12 are connected to the tail gas treatment system 39 .
[0025] The heating energy of the circulating fluidized bed preheater 12 comes from the high-temperature flue gas generated by the combustion of the heating furnace 21. The flue gas is fully heat-exchanged with the raw material powder and then purified by the exhaust gas treatment system 39 before being discharged in compliance with emission standards.
[0026] In order to prepare nitrogen, the nitrogen supply assembly also includes a nitrogen generation assembly, which includes an electrolytic water system 29 and an air separation system 32. The oxygen outlets of the electrolytic water system 29 and the air separation system 32 are connected to an oxygen storage device 31, and the hydrogen outlet of the electrolytic water system 29 is connected to a hydrogen storage device 30. The hydrogen storage device 30 is connected to the second gas mixing device 23, and the nitrogen outlet of the air separation system 32 is connected to the nitrogen storage device 33.
[0027] The nitrogen product of the air separation system 32 is used to cool the materials in the circulating fluidized cooler 15 and as the protective gas for the iron powder product packaging system. The oxygen product is transported to the oxygen storage device 31 via a pipeline. The oxygen product of the electrolytic water system 29 is also transported to the oxygen storage device 31 via a pipeline for external sale. The hydrogen product is buffered in the hydrogen storage device 30 and then sent to the second gas mixing device 23.
[0028] In order to use green energy, the energy of the water electrolysis system 29 and the air separation system 32 comes from a wind power system 37 and a photovoltaic system 38 .
[0029] Preferably, the high-purity iron powder outlet of the circulating fluidized bed cooler 15 is connected to a packaging system 35 , and the packaging system 35 is connected to a high-purity iron powder storage device 36 .
[0030] The product enters the packaging system 35 and is protected by nitrogen to avoid contact with air moisture. The packaged finished product can be placed in the high-purity iron powder storage device 36 and wait for sale.
[0031] The embodiments of the present invention are described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Various changes can be made within the scope of knowledge possessed by ordinary technicians in this field without departing from the purpose of the present invention.
Claims
1. A system for producing high-purity iron powder using renewable energy based on multi-stage fluidized bed reduction, characterized in that: The invention comprises a multi-stage fluidized reduction component, a circulating gas supply and recovery component and a nitrogen supply component, wherein the multi-stage fluidized reduction component comprises a circulating fluidized preheater (12), a primary circulating fluidized reduction reactor (13), a secondary circulating fluidized reduction reactor (14) and a circulating fluidized cooler (15) connected in sequence, and the circulating gas supply component comprises a first gas mixing device (20), a waste heat boiler (16), a circulating gas purification system (17), a circulating gas MDEA decarbonization system (18) and a circulating gas heater (19) connected in sequence, and the first gas mixing device (20) is respectively connected to the primary circulating fluidized reduction reactor (13), the secondary circulating fluidized reduction reactor (14) and the circulating fluidized reduction reactor (15). 4) The circulating gas inlet at the lower end is connected, the circulating gas outlets at the upper ends of the primary circulating fluidized reduction reactor (13) and the secondary circulating fluidized reduction reactor (14) are both connected to the waste heat boiler (16), and the outlet of the circulating gas heater (19) is connected to the first gas mixing device (20); the nitrogen supply assembly includes a nitrogen storage device (33) and a cooling gas purification system (34), the nitrogen storage device (33) is connected to the cooling gas inlet at the lower end of the circulating fluidized cooler (15), the cooling gas outlet at the upper end of the circulating fluidized cooler (15) is connected to the cooling gas purification system (34), and the cooling gas purification system (34) is connected to the nitrogen storage device (33).
2. The system for producing high-purity iron powder using renewable energy based on multi-stage fluidized bed reduction according to claim 1, characterized in that: The invention also comprises a refined iron powder preparation component, which comprises a refined iron ore storage device (1), a crusher (2), a grinding mill (3), a weak magnetic separator (4) and a flotation component connected in sequence, wherein the refined iron powder outlet of the flotation component is connected to the refined iron powder inlet of the circulating fluidized bed preheater (12).
3. The system for producing high-purity iron powder using renewable energy based on multi-stage fluidized reduction according to claim 2, characterized in that: The flotation assembly comprises a flotation roughing device (5), a first flotation cleaning device (6), a second flotation cleaning device (7), a third flotation cleaning device (8), a fourth flotation cleaning device (9), a super fine iron powder storage device (10) and an ordinary fine iron powder storage device (11) connected in sequence, the ordinary fine iron powder outlet of each flotation cleaning device is connected to the ordinary fine iron powder storage device (11), the super fine iron powder outlet of the fourth flotation cleaning device (9) is connected to the super fine iron powder storage device (10), and the ordinary fine iron powder storage device (11) and the super fine iron powder storage device (10) are connected to the fine iron powder inlet of the circulating fluidized bed preheater (12).
4. The system for producing high-purity iron powder using renewable energy based on multi-stage fluidized bed reduction according to claim 1, characterized in that: The circulating gas supply and recovery component also includes a circulating gas generation component, which includes a biomass reducing gas preparation system (24), a reducing gas purification system (25), a reducing gas conversion system (26), a reducing gas MDEA decarbonization system (27), a reducing gas storage cabinet (28), a second gas mixing device (23), a heating furnace (21) and a plasma generator (22); the biomass reducing gas preparation system (24), the reducing gas purification system (25), the reducing gas conversion system (26), the reducing gas MDEA decarbonization system (27), the reducing gas storage cabinet (28), the second gas mixing device (23), the heating furnace (21) and the plasma generator (22) are connected in sequence, and the reducing gas purification system (25) is also connected to the heating furnace (21); the plasma generator (22) is connected to the first gas mixing device (20); and the nitrogen storage device (33) is also connected to the first gas mixing device (20).
5. The system for producing high-purity iron powder using renewable energy based on multi-stage fluidized bed reduction according to claim 4, characterized in that: The heating furnace (21) and the preheating gas inlet at the lower end of the circulating fluidized bed preheater (12), and the preheating gas outlet at the upper end of the circulating fluidized bed preheater (12) are connected to the tail gas treatment system (39).
6. The system for producing high-purity iron powder using renewable energy based on multi-stage fluidized bed reduction according to claim 4, characterized in that: The nitrogen supply assembly further includes a nitrogen generating assembly, which includes an electrolytic water system (29) and an air separation system (32). The oxygen outlets of the electrolytic water system (29) and the air separation system (32) are connected to an oxygen storage device (31), the hydrogen outlet of the electrolytic water system (29) is connected to a hydrogen storage device (30), the hydrogen storage device (30) is connected to the second gas mixing device (23), and the nitrogen outlet of the air separation system (32) is connected to the nitrogen storage device (33).
7. The system for producing high-purity iron powder using renewable energy based on multi-stage fluidized reduction according to claim 6, characterized in that: The energy of the water electrolysis system (29) and the air separation system (32) comes from a wind power system (37) and a photovoltaic system (38).
8. The system for producing high-purity iron powder using renewable energy based on multi-stage fluidized bed reduction according to claim 1, characterized in that: The high-purity iron powder outlet of the circulating fluidized bed cooler (15) is connected to a packaging system (35), and the packaging system (35) is connected to a high-purity iron powder storage device (36).