Coal gasification suspension smelting ironmaking device and method

Abstract

The application discloses a coal gasification suspension smelting iron-making device and method, and belongs to the technical field of metallurgy and coal chemical industry. The device comprises a raw material conveying unit, a suspension smelting iron-making furnace, a coal gas purification unit and a gas supply unit. The upper part of the suspension smelting iron-making furnace is a coal gasification suspension flash reduction section, and the lower part is a molten pool smelting section. The coal gasification suspension flash reduction section realizes the gasification of coal and the preliminary reduction of iron ore powder. The molten pool smelting section realizes the deep reduction of the iron ore powder. The product is molten iron and high-quality coal gas. The coal-iron-chemical combined production is realized. The iron-making process flow is simplified, and the energy consumption and carbon emission of the overall process are reduced.

Description

Technical Field

[0001] This invention belongs to the field of metallurgy and coal chemical technology, specifically relating to a coal gasification suspension melting ironmaking apparatus and method. Background Technology

[0002] Patent (CN112760137A) discloses an integrated energy-saving and environmentally friendly device and method for multi-stage fluidized bed coal gasification agent suspension melting reduction smelting, employing multi-stage fluidized bed coal gasification technology, coal gas conversion technology, suspension melting reduction technology, and molten pool smelting technology. However, it suffers from drawbacks such as complex structure and low effective gas content. Patent (CN115418428A) discloses a direct melting reduction furnace, using methane to provide heat and employing direct melting reduction technology for pulverized coal and iron ore powder. However, due to my country's natural gas shortage, ironmaking costs are high. Summary of the Invention

[0003] To address the problems of high cost, poor energy utilization, and complex equipment in current coal gasification ironmaking processes, this invention provides a coal gasification suspension melting ironmaking device and method. It is an efficient integration of coal gasification technology and non-blast furnace ironmaking technology, providing the coal chemical and steel industries with a new energy-saving and environmentally friendly device and method.

[0004] To achieve the above objectives, the present invention employs the following technical solutions:

[0005] A coal gasification suspension melting ironmaking device includes a raw material conveying unit, a suspension melting ironmaking furnace, a coal gas purification unit, and a gas supply unit;

[0006] The raw material conveying unit includes a pulverized coal conveying system and a mineral powder conveying system; the pulverized coal conveying system includes a pulverized coal storage tank and a pulverized coal conveying tank; the lower outlet of the pulverized coal storage tank is connected to the upper inlet of the pulverized coal conveying tank, and the lower outlet of the pulverized coal conveying tank is connected to a nozzle; the mineral powder conveying system includes an iron ore powder heat exchanger, a lime storage tank, and a mineral powder conveying tank; the lower outlets of the iron ore powder heat exchanger and the lime storage tank are connected to the upper inlet of the mineral powder conveying tank, and the lower outlet of the mineral powder conveying tank is divided into two paths, which are respectively connected to the nozzle and the mineral powder inlet of the suspension melting smelting furnace;

[0007] The upper part of the suspension smelting ironmaking furnace is a coal gasification suspension flash reduction section, and the lower part is a molten pool smelting section. The coal gasification suspension flash reduction section is equipped with a membrane water-cooled wall and refractory insulation material. A nozzle is provided at the top of the coal gasification suspension flash reduction section, and an iron ore powder inlet is provided in the middle. The membrane water-cooled wall is connected to the steam drum. The molten pool smelting section is equipped with a reducing gas inlet, an oxygen inlet, a slag discharge port, an iron tapping port, and a coal gas outlet. The oxygen inlet is located below the reducing gas inlet, and the iron tapping port is located below the slag discharge port.

[0008] The gas purification unit includes a water washing tower and a separator. Circulating water enters from the top of the water washing tower, and circulating return water exits from the bottom of the water washing tower. The upper outlet of the water washing tower is connected to the separator. The reducing gas discharged from the separator is returned to the smelting section of the suspension melting ironmaking furnace. The gas discharge boundary is used as a raw material for chemical synthesis.

[0009] The gas supply unit includes: steam, oxygen, coal powder conveying gas and mineral powder conveying gas. The steam comes from the steam drum and is divided into two paths: one path enters the nozzle and the other path exits the boundary area. The oxygen is divided into two paths: one path enters the nozzle and the other path enters the molten pool smelting section. The coal powder conveying gas is either nitrogen or air, and the mineral powder conveying gas is air.

[0010] Furthermore, the gas from the outlet of the suspension molten ironmaking furnace enters the iron ore powder heat exchanger to exchange heat with the iron ore powder, and then enters the water washing tower. There is an induced draft fan in the bypass of the gas pipeline between the suspension molten ironmaking furnace and the iron ore powder heat exchanger.

[0011] Furthermore, the weight ratio of iron ore powder to coal powder is 1.0 to 2.0.

[0012] Furthermore, the ratio of oxygen to pulverized coal is 0.4–1.0 Nm³. 3 / kg.

[0013] Furthermore, the weight ratio of steam to pulverized coal entering the suspension melting blast furnace is 0 to 0.1.

[0014] A coal gasification suspension melting ironmaking method includes the following steps:

[0015] Step 1: Turn on the induced draft fan to introduce fuel and oxygen into the burner, and then introduce fuel and oxygen into the coal gasification suspension flash reduction section and the molten pool smelting section to start the igniter and perform furnace baking.

[0016] Step 2: When the temperature of the coal gasification suspension flash reduction section and the molten pool smelting section reaches above 600℃, stop the induced draft fan; start the water circulation system of the water washing tower to introduce the flue gas into the water washing tower and continue to dry the furnace;

[0017] Step 3: When the temperature of the coal gasification suspension flash reduction section reaches above 1000℃, stop the furnace fuel for the coal gasification suspension flash reduction section and the molten pool smelting section, send the coal powder into the nozzle through the coal powder conveying tank, send the steam into the suspension melting ironmaking furnace through the nozzle, and send the reducing gas nozzle into the nozzle of the molten pool smelting section.

[0018] Step 4: When the temperature of the coal gasification suspension flash reduction section and the molten pool smelting section reaches above 1400℃, iron ore powder and lime are sent into the suspension melting ironmaking furnace through the ore powder conveying tank. Coal powder and oxygen undergo a gasification reaction in the coal gasification suspension flash reduction section to generate CO-rich coal gas. CO reacts with iron ore powder to reduce most of the iron ore powder to iron.

[0019] Step 5: Unreduced iron ore powder and unreacted carbon enter the molten pool smelting section. The reducing gas and oxygen undergo a combustion reaction to provide heat. The unreacted carbon and unreduced iron ore powder undergo a reduction reaction, and all the iron ore powder is converted into iron.

[0020] Step 6: In the molten pool smelting section, slag and iron are separated. Ash and slag are discharged from the slag discharge port to the boundary area, and molten iron is discharged from the tapping port to be sent to steelmaking.

[0021] Step 7: The gas from the outlet of the suspension melting blast furnace passes sequentially through an iron ore powder heat exchanger, a water washing tower, and a separator. The separated reducing gas enters the suspension melting blast furnace, and the gas is discharged from the boundary area.

[0022] Furthermore, the reaction temperature in the suspension melting blast furnace is 1400–1600℃.

[0023] Furthermore, the ratio of reducing gas to iron ore powder is 0.05–0.15 Nm. 3 / kg, the reducing gas composition includes CO and H2.

[0024] Furthermore, the volume of effective components CO and H2 in the coal gas is greater than 60%.

[0025] Compared with the prior art, the present invention has the following advantages:

[0026] 1) Utilize gasification residue to achieve deep reduction of iron ore powder, and use iron ore powder to lower the melting point of coal ash, thereby improving energy utilization efficiency;

[0027] 2) It eliminates the coking and sintering units of traditional blast furnaces, reducing process energy consumption.

[0028] 3) Achieve coal-iron-chemical co-production, simplify the ironmaking process, reduce product costs, and reduce carbon emissions. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the structure of the coal gasification suspension melting ironmaking device of the present invention.

[0030] Figure reference numerals: 1. Powdered coal; 2. Powdered iron ore; 3. Lime; 4. Powdered coal storage tank; 5. Powdered iron ore heat exchanger; 6. Lime storage tank; 7. Powdered coal conveying tank; 8. Powdered ore conveying tank; 9. Oxygen; 10. Suspension smelting furnace; 10-1. Coal gasification suspension flash reduction section; 10-2. Molten pool smelting section; 10-3. Nozzle; 10-4. Membrane water-cooled wall; 10-5. Refractory insulation material; 10-6. Refractory brick; 10-7. Oxygen inlet; 10- 8. Gas outlet; 10-9. Reducing gas inlet; 10-10. Slag discharge port; 10-11. Iron tapping port; 10-12. Ore powder inlet; 11. Ash and slag; 12. Molten iron; 13. Steam drum; 14. Steam; 15. Water washing tower; 16. Separator; 17. Gas; 18. Reducing gas; 19. Gas outlet from suspension melting blast furnace; 20. Pulverized coal conveying gas; 21. Ore powder conveying gas; 22. Circulating water supply; 23. Circulating water discharge; 24. Exhaust fan. Detailed Implementation

[0031] The present invention will be further illustrated by the following embodiments, but is not limited to the following embodiments.

[0032] like Figure 1 As shown, a coal gasification suspension melting ironmaking device includes a raw material conveying unit, a suspension melting ironmaking furnace, a coal gas purification unit, and a gas supply unit.

[0033] The upper part of the suspension smelting ironmaking furnace 10 is the coal gasification suspension flash reduction section 10-1, and the lower part is the molten pool smelting section 10-2.

[0034] The gasification suspension smelting ironmaking device has a cylindrical gasification suspension flash reduction section 10-1, which contains a membrane water-cooled wall 10-4 and refractory insulation material 10-5. The membrane water-cooled wall 10-4 is connected to the steam drum 13. A nozzle 10-3 is provided at the top, and an iron ore powder inlet 10-12 is provided in the middle. The molten pool smelting section 10-2 is cylindrical and has a reducing gas inlet 10-9, an oxygen inlet 10-7, a slag discharge port 10-10, an iron outlet 10-11, and a gas outlet 10-8. The oxygen inlet 10-7 is located below the reducing gas inlet 10-9, and the iron outlet 10-11 is located below the slag discharge port 10-10.

[0035] The coal gasification suspension melting ironmaking device includes a raw material conveying unit comprising a pulverized coal conveying system and an iron ore powder conveying system. The lower outlet of the pulverized coal storage tank 4 of the pulverized coal conveying system is connected to the upper inlet of the pulverized coal conveying tank 7, and the lower outlet of the pulverized coal conveying tank 7 is connected to the nozzle 10-3.

[0036] The coal gasification suspension melting ironmaking device includes an iron ore powder heat exchanger 5, a lime storage tank 6, and an iron ore powder conveying tank 8. The lower outlets of the iron ore powder heat exchanger 5 and the lime storage tank 6 are connected to the upper inlet of the iron ore powder conveying tank 8. The lower outlet of the iron ore powder conveying tank 8 is divided into two paths, which are respectively connected to the nozzle 10-3 and the iron ore powder inlet 10-12 of the suspension melting smelting furnace 10.

[0037] In the aforementioned coal gasification suspension melting ironmaking device, the coal gas 19 from the outlet of the suspension melting ironmaking furnace enters the iron ore powder heat exchanger 5 and exchanges heat with the iron ore powder 2, and then enters the water washing tower 15. There is an induced draft fan 24 in the bypass of the coal gas pipeline between the suspension melting ironmaking furnace 10 and the iron ore powder heat exchanger 5.

[0038] The gasification suspension melting ironmaking device includes a gas purification unit comprising a water washing tower 15 and a separator 16. Circulating water 22 enters from the upper part of the water washing tower 15, and circulating return water 23 exits from the lower part of the water washing tower 15. The upper outlet of the water washing tower 15 is connected to the separator 16. The reducing gas 18 discharged from the separator 16 enters the smelting section 10-2 of the suspension melting ironmaking furnace, and the gas 17 is discharged from the boundary area as a raw material for chemical synthesis.

[0039] The gasification suspension melting ironmaking device includes a gas supply unit comprising steam 14, oxygen 9, pulverized coal conveying gas 20, and ore powder conveying gas 21. The steam 14 comes from the steam drum 13 and is divided into two paths: one enters the nozzle 10-3, and the other exits the boundary area. The oxygen 9 is also divided into two paths: one enters the nozzle 10-3, and the other enters the smelting section 10-2 of the molten pool. The pulverized coal conveying gas 20 is either nitrogen or air, and the ore powder conveying gas 21 is air.

[0040] In the aforementioned coal gasification suspension melting ironmaking device, the weight ratio of iron ore powder 2 to coal powder 1 is 1.0-2.0, and the ratio of oxygen 9 to coal powder 1 is 0.4-1.0 Nm. 3 / kg, the weight ratio of steam to pulverized coal 1 entering the suspension melting blast furnace is 0-0.1.

[0041] The coal gasification suspension melting ironmaking method includes the following steps:

[0042] Step 1: Turn on the induced draft fan 24, and introduce fuel and oxygen 9 into the burner 10-3. Then, introduce fuel and oxygen 9 into the coal gasification suspension flash reduction section 10-1 and the molten pool smelting section 10-2 to start the igniter and perform furnace baking.

[0043] Step 2: When the temperature of the coal gasification suspension flash reduction section 10-1 and the molten pool smelting section 10-2 reaches above 600℃, stop the induced draft fan 24. Start the water circulation system of the water washing tower 15 to introduce the flue gas into the water washing tower 15 and continue the furnace drying process.

[0044] Step 3: When the temperature of the coal gasification suspension flash reduction section 10-1 reaches above 1000℃, stop the furnace fuel supply to the coal gasification suspension flash reduction section 10-1 and the molten pool smelting section 10-2. Send coal powder 1 into nozzle 10-3 through coal powder conveying tank 7. Send steam 14 into suspension melting ironmaking furnace 10 through nozzle 10-3. Send reducing gas nozzle 18 into nozzle 10-2 of molten pool smelting section.

[0045] Step 4: When the temperature of the coal gasification suspension flash reduction section 10-1 and the molten pool smelting section 10-2 reaches above 1400℃, iron ore powder 2 and lime 3 are sent into the suspension melting ironmaking furnace 10 through the ore powder conveying tank 8. Coal powder 1 and oxygen 9 undergo a gasification reaction in the coal gasification suspension flash reduction section 10-1 to generate CO-rich coal gas. CO reacts with iron ore powder 2 to reduce most of the iron ore powder 2 to iron.

[0046] Step 5: Unreduced iron ore powder 2 and unreacted carbon enter the smelting section 10-2 of the molten pool. Reducing gas 18 and oxygen 9 undergo a combustion reaction to provide heat. The unreacted carbon and unreduced iron ore powder 2 undergo a reduction reaction, and all of the iron ore powder 2 is converted into iron.

[0047] Step 6: In the smelting section 10-2 of the molten pool, slag and iron are separated. Ash slag 11 is discharged from the slag discharge port 10-10 and the molten iron 12 is discharged from the tapping port 10-11 and sent to steelmaking.

[0048] Step 7: The outlet gas 19 of the suspension melting blast furnace passes sequentially through the iron ore powder heat exchanger 5, the water washing tower 15 and the separator 16. The separated reducing gas 18 enters the suspension melting blast furnace 10, and the gas 17 is discharged from the boundary area.

[0049] In the aforementioned coal gasification suspension melting ironmaking method, the reaction temperature of the suspension melting ironmaking furnace 10 is 1400-1600℃, and the ratio of reducing gas to iron ore powder 1 is 0.05-0.15 Nm³. 3 / kg, reducing gas 18 consists of CO and H2. The effective components of coal gas 17, CO + H2, are greater than 60%.

[0050] The following details the coal gasification suspension melting ironmaking method through specific implementation procedures.

[0051] Example 1:

[0052] When the temperature of the gasification suspension flash reduction section 10-1 reaches 1000℃, the furnace drying fuel supply to the suspension smelting ironmaking furnace 10 is stopped. Powdered coal 1 (150 mesh), oxygen 9, and steam 14 are fed into nozzle 10-3, controlling the temperature of the gasification suspension flash reduction section 10-1 at 1600℃. Reducing gas 18 is then fed into nozzle 10-2 of the molten pool smelting section. When the temperature of the molten pool smelting section 10-2 reaches 1400℃, iron ore powder 2 and lime 3 are fed into nozzle 10-3, controlling the temperature of the molten pool smelting section at 1600℃. Ash slag 11 is discharged from the slag discharge port 10-10, and molten iron 12 is discharged from the tapping port 10-11 for steelmaking. The weight ratio of iron ore powder 2 to powdered coal 1 is 1.8, and the ratio of oxygen 9 to powdered coal 1 is 0.9 Nm. 3 / kg, the weight ratio of steam to pulverized coal 1 entering the suspension melting blast furnace is 0.07. The ratio of reducing gas to iron ore powder 1 is 0.1 Nm³. 3 / kg, the effective components CO+H2 in coal gas 17 are 68%.

[0053] Example 2:

[0054] When the temperature of the coal gasification suspension flash reduction section 10-1 reaches 1100℃, the furnace fuel supply to the suspension smelting ironmaking furnace 10 is stopped. Powdered coal 1 (150 mesh), oxygen 9, and steam 14 are fed into nozzle 10-3, and the temperature of the coal gasification suspension flash reduction section 10-1 is controlled at 1600℃. Reducing gas 18 is fed into nozzle 10-2 of the molten pool smelting section. When the temperature of the molten pool smelting section 10-2 reaches 1450℃, iron ore powder 2 and lime 3 are fed into the suspension smelting ironmaking furnace 10 through the ore powder inlet 10-12. The temperature of the molten pool smelting section is controlled at 1600℃. Ash slag 11 is discharged from the slag discharge port 10-10, and molten iron 12 is discharged from the tapping port 10-11 and sent to steelmaking. The weight ratio of iron ore powder 2 to coal powder 1 is 1.4, the ratio of oxygen 9 to coal powder 1 is 0.9 Nm³ / kg, and the weight ratio of steam to coal powder 1 entering the suspension melting blast furnace is 0.05. The ratio of reducing gas to iron ore powder 1 is 0.15 Nm³ / kg. 3 / kg, the effective components of coal gas 17 are CO+H2, which is 65%.

[0055] Example 3:

[0056] When the temperature of the gasification suspension flash reduction section 10-1 reaches 1050℃, the furnace drying fuel supply to the suspension smelting ironmaking furnace 10 is stopped. Powdered coal 1 (200 mesh), oxygen 9, and steam 14 are fed into nozzle 10-3, controlling the temperature of the gasification suspension flash reduction section 10-1 at 1550℃. Reducing gas 18 is then fed into nozzle 10-2 of the molten pool smelting section. When the temperature of the molten pool smelting section 10-2 reaches 1500℃, iron ore powder 2 and lime 3 are fed into the suspension smelting ironmaking furnace 10 through the ore powder inlet 10-12, controlling the temperature of the smelting section at 1600℃. Ash slag 11 is discharged from the slag discharge port 10-10, and molten iron 12 is discharged from the tapping port 10-11 for steelmaking. The weight ratio of iron ore powder 2 to powdered coal 1 is 1.6, and the ratio of oxygen 9 to powdered coal 1 is 0.7 Nm. 3 / kg, the weight ratio of steam to pulverized coal 1 entering the suspension melting blast furnace is 0.1. The ratio of reducing gas to iron ore powder 1 is 0.05 Nm³. 3 / kg, the effective components CO+H2 in coal gas 17 are 63%.

[0057] Example 4:

[0058] When the temperature of the gasification suspension flash reduction section 10-1 reaches 1100℃, the furnace drying fuel supply to the suspension molten ironmaking furnace 10 is stopped. Powdered coal 1 (200 mesh), oxygen 9, and steam 14 are fed into nozzle 10-3, controlling the temperature of the gasification suspension flash reduction section 10-1 at 1400℃. Reducing gas 18 is then fed into nozzle 10-2 of the molten pool smelting section. When the temperature of the molten pool smelting section 10-2 reaches 1450℃, iron ore powder 2 and lime 3 are fed into nozzle 10-3, controlling the temperature of the molten pool smelting section at 1550℃. Ash slag 11 is discharged from the slag discharge port 10-10, and molten iron 12 is discharged from the tapping port 10-11 for steelmaking. The weight ratio of iron ore powder 2 to powdered coal 1 is 1.0, and the ratio of oxygen 9 to powdered coal 1 is 0.6 Nm. 3 / kg, the weight ratio of steam to pulverized coal 1 entering the suspension melting blast furnace is 0.1. The ratio of reducing gas to iron ore powder 1 is 0.08 Nm³. 3 / kg, the effective component CO+H2 in coal gas 17 is 70%.

[0059] Contents not described in detail in this specification are prior art known to those skilled in the art. Although illustrative specific embodiments of the invention have been described above to facilitate understanding by those skilled in the art, it should be understood that the invention is not limited to the scope of the specific embodiments. Various modifications are readily apparent to those skilled in the art as long as they fall within the spirit and scope of the invention as defined and determined by the appended claims, and all inventions utilizing the concept of this invention are protected.

Claims

1. A coal gasification suspension melting ironmaking device, characterized in that: It includes a raw material conveying unit, a suspension melting blast furnace, a gas purification unit, and a gas supply unit; The raw material conveying unit includes a pulverized coal conveying system and a pulverized ore conveying system; the pulverized coal conveying system includes a pulverized coal storage tank and a pulverized coal conveying tank; the lower outlet of the pulverized coal storage tank is connected to the upper inlet of the pulverized coal conveying tank, and the lower outlet of the pulverized coal conveying tank is connected to a nozzle; the pulverized ore conveying system includes an iron ore heat exchanger, a lime storage tank, and a pulverized ore conveying tank; the lower outlets of the iron ore heat exchanger and the lime storage tank are connected to the upper inlet of the pulverized ore conveying tank, and the lower outlet of the pulverized ore conveying tank is divided into two paths, which are respectively connected to the nozzle and the pulverized ore inlet of the suspension melting blast furnace; The upper part of the suspension smelting furnace is a coal gasification suspension flash reduction section, and the lower part is a molten pool smelting section. The coal gasification suspension flash reduction section has a membrane water-cooled wall and refractory insulation material inside. A nozzle is provided at the top of the coal gasification suspension flash reduction section, and a ore powder inlet is provided in the middle. The membrane water-cooled wall is connected to the steam drum. The molten pool smelting section is provided with a reducing gas inlet, an oxygen inlet, a slag discharge port, an iron tapping port, and a coal gas outlet. The oxygen inlet is located below the reducing gas inlet, and the iron tapping port is located below the slag discharge port. The gas purification unit includes a water washing tower and a separator. Circulating water enters from the top of the water washing tower, and circulating return water exits from the bottom of the water washing tower. The upper outlet of the water washing tower is connected to the separator. The reducing gas discharged from the separator is returned to the smelting section of the suspension melting ironmaking furnace. The gas discharge boundary is used as a raw material for chemical synthesis. The gas supply unit includes: steam, oxygen, coal powder conveying gas and mineral powder conveying gas. The steam comes from the steam drum and is divided into two paths: one path enters the nozzle and the other path exits the boundary area. The oxygen is divided into two paths: one path enters the nozzle and the other path enters the molten pool smelting section. The coal powder conveying gas is either nitrogen or air, and the mineral powder conveying gas is air.

2. The coal gasification suspension melting ironmaking device according to claim 1, characterized in that: The gas from the outlet of the suspension smelting blast furnace enters the iron ore powder heat exchanger and exchanges heat with the iron ore powder, and then enters the water washing tower. There is an induced draft fan in the bypass of the gas pipeline between the suspension smelting blast furnace and the iron ore powder heat exchanger.

3. The coal gasification suspension melting ironmaking device according to claim 1, characterized in that: The weight ratio of iron ore powder to coal powder is 1.0 to 2.

0.

4. The coal gasification suspension melting ironmaking device according to claim 1, characterized in that: The oxygen to pulverized coal ratio is 0.4~1.0 Nm. 3 / kg.

5. The coal gasification suspension melting ironmaking apparatus according to claim 1, characterized in that: The weight ratio of steam to pulverized coal entering the suspension melting blast furnace is 0 to 0.1, not 0.

6. A method for ironmaking by coal gasification suspension melting using the apparatus described in any one of claims 1 to 5, characterized in that, Includes the following steps: Step 1: Turn on the induced draft fan to introduce fuel and oxygen into the nozzle, and then introduce fuel and oxygen into the coal gasification suspension flash reduction section and the molten pool smelting section to start the igniter and perform furnace baking. Step 2: When the temperature of the coal gasification suspension flash reduction section and the molten pool smelting section reaches above 600℃, stop the induced draft fan; start the water circulation system of the water washing tower to introduce the flue gas into the water washing tower and continue to dry the furnace; Step 3: When the temperature of the coal gasification suspension flash reduction section reaches above 1000℃, stop the furnace fuel for the coal gasification suspension flash reduction section and the molten pool smelting section, send the coal powder into the nozzle through the coal powder conveying tank, send the water vapor into the suspension melting ironmaking furnace through the nozzle, and send the reducing gas into the nozzle of the molten pool smelting section. Step 4: When the temperature of the coal gasification suspension flash reduction section and the molten pool smelting section reaches above 1400℃, iron ore powder and lime are sent into the suspension melting ironmaking furnace through the ore powder conveying tank. Coal powder and oxygen undergo a gasification reaction in the coal gasification suspension flash reduction section to generate CO-rich coal gas. CO reacts with iron ore powder to reduce most of the iron ore powder to iron. Step 5: Unreduced iron ore powder and unreacted carbon enter the molten pool smelting section. The reducing gas and oxygen undergo a combustion reaction to provide heat. The unreacted carbon and unreduced iron ore powder undergo a reduction reaction, and all the iron ore powder is converted into iron. Step 6: In the molten pool smelting section, slag and iron are separated. Ash and slag are discharged from the slag discharge port to the boundary area, and molten iron is discharged from the tapping port to be sent to steelmaking. Step 7: The gas from the outlet of the suspension melting blast furnace passes sequentially through an iron ore powder heat exchanger, a water washing tower, and a separator. The separated reducing gas enters the suspension melting blast furnace, and the gas is discharged from the boundary area.

7. The coal gasification suspension melting ironmaking method according to claim 6, characterized in that: The reaction temperature of the suspension melting blast furnace is 1400~1600℃.

8. The coal gasification suspension melting ironmaking method according to claim 6, characterized in that: Reducing gas / iron ore powder = 0.05~0.15 Nm 3 / kg, the reducing gas composition includes CO and H2.

9. The coal gasification suspension melting ironmaking method according to claim 6, characterized in that: The volume of effective components CO and H2 in the coal gas is greater than 60%.

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