An integrated device and method for iron ore pulverized coal gasification suspension pre-reduction and suspension smelting

Abstract

The invention discloses an integrated device and method for coal gasification suspension pre-reduction and suspension smelting of iron ore powder. The left side of the device is a coal gasification suspension smelting reduction smelting furnace, the lower part is a molten pool, and the right side of the molten pool is an ascending flue; the ascending flue is 1 meter higher than the molten pool to the side opening at the height of the flue diameter, connected to the suspension pre-reduction furnace, and the lower part of the pre-reduction furnace is provided with iron ore powder, water vapor, and hydrogen inlet nozzles; a two-stage cyclone separator is provided outside the pre-reduction furnace; the upper opening of the cyclone separator is connected to a high-temperature coal gas waste heat utilization device and a rear system; the lower opening of the cyclone separator is connected to a pre-reduction hot ore powder intermediate storage tank, and the intermediate storage tank is connected to the hot pre-reduction iron ore powder inlet at the top of the coal gasification suspension smelting reduction smelting furnace by a spiral conveying pipeline. The method uses 1200-1500℃ high-temperature coal gas in the ascending flue to pre-reduced iron ore powder, and after suspension pre-reduction, it directly enters the suspension smelting furnace in a hot state for suspension smelting reduction smelting, thereby forming a double suspension smelting method for iron ore powder.

Description

Technical Field

[0001] The invention relates to a coal gasification suspension pre-reduction and suspension smelting device and method for iron ore powder, belonging to the technical field of metallurgy. Background Art

[0002] Non-blast furnace ironmaking with energy saving, consumption reduction and carbon reduction is the development direction of the steel smelting industry. And coal gasification suspension smelting is an important technical direction of non-blast furnace ironmaking technology. Using the high-temperature coal gas of coal gasification suspension smelting to pre-reducing iron ore powder is a technical point of concern. Chinese patent CN103993115A "Drying and reduction integrated flash ironmaking equipment and ironmaking method" discloses a pre-reduction smelting integrated technology. However, the technology is too simple in the pre-reduction technology part. Therefore, it is necessary to study a complete new iron ore powder coal gasification suspension pre-reduction and suspension smelting device and method to improve the thermal utilization rate and suspension smelting efficiency of coal gasification suspension smelting. Summary of the invention

[0003] The present invention aims to provide an integrated device and method for iron ore powder coal gasification suspension pre-reduction and suspension smelting, which is a new device and method for iron ore powder suspension smelting.

[0004] The present invention provides an integrated device for gasification, suspension, pre-reduction and suspension smelting of iron ore powder. The integrated device comprises a descending coal gasification, suspension, melting and reduction smelting furnace on the left side, a molten pool at the bottom, and an ascending flue and pre-reduction furnace on the right side. The top of the iron ore powder gasification, suspension, melting and reduction smelting furnace is provided with three-channel nozzles for pure oxygen, coal powder and hot pre-reduced iron ore powder. The molten pool at the bottom of the furnace body is provided with a slag outlet, a molten iron outlet and a coal gas injection inlet.

[0005] The iron ore powder coal gasification suspension pre-reduction and suspension smelting integrated device has an ascending flue on the right side of the molten pool that opens at a point 1 meter above the molten pool and equal to the flue diameter, and the opening is connected to an ascending suspension pre-reduction furnace; the inner diameter cross-sectional area of ​​the suspension pre-reduction furnace is 1 / 4 smaller than the flue cross-sectional area, and an iron ore powder, water vapor and hydrogen inlet nozzle is provided at the bottom of the pre-reduction furnace; the height of the pre-reduction furnace is preferably such that the ascending iron ore powder stays for 4-6 seconds, and a two-stage cyclone separator is connected to the outside of the pre-reduction furnace.

[0006] In the above device, the lower opening of the cyclone separator is connected to the reduced hot ore powder intermediate storage tank, and the intermediate storage tank is connected to the hot pre-reduced iron ore powder inlet at the top of the coal gasification suspension smelting reduction smelting furnace by a spiral conveying pipeline.

[0007] In the above device, the upper opening of the secondary cyclone separator is connected to a high-temperature coal gas waste heat utilization device, and the waste heat utilization device is sequentially connected to a dust removal device, an induced draft fan and a coal gas finishing and utilization device.

[0008] The present invention provides a method for iron ore pulverized coal gasification suspension pre-reduction and suspension smelting, comprising the following steps:

[0009] (1) Start the coal gasification function of the integrated device, spray the pulverized coal and pure oxygen into the furnace from the inlet at the top of the furnace, and control the coal-oxygen ratio so that the temperature in the double suspension smelting furnace can reach a stable temperature of 1500°C;

[0010] (2) At the beginning of this process, the slag outlet and molten iron outlet on the molten pool are opened. When the molten pool temperature stabilizes at 1500°C, the slag outlet and molten iron outlet are closed;

[0011] (3) When the temperature of the pre-reduction furnace reaches 1500°C stably, the induced draft fan is started. After the negative pressure is stabilized, iron ore powder is sprayed from the iron ore powder inlet at the bottom of the pre-reduction furnace, and hydrogen is sprayed from the hydrogen inlet to cause the iron ore powder to undergo a pre-reduction reaction;

[0012] (4) The high-temperature coal gas carrying the pre-reduced iron ore powder enters the two-stage cyclone separator to separate and collect the pre-reduced ore powder, and the collected pre-reduced ore powder enters the hot pre-reduced ore powder intermediate storage tank;

[0013] (5) The hot pre-reduced ore powder is sent from the hot pre-reduced ore powder intermediate storage tank to the hot pre-reduced iron ore powder inlet at the top of the coal gasification suspension smelting reduction smelting furnace by a screw conveyor, and is sprayed into the smelting furnace together with coal powder and pure oxygen for coal gasification suspension reduction smelting;

[0014] (6) The high-temperature coal gas coming out of the upper outlet of the secondary cyclone separator enters the waste heat utilization device to recover the waste heat. After the waste heat is utilized, the coal gas enters the coal gas finishing device for utilization after dust removal.

[0015] The specific process flow in the above method is described as follows:

[0016] In the iron ore pulverized coal gasification suspension pre-reduction and suspension smelting method, the inlet temperature of the first-stage cyclone separator is controlled below 600°C.

[0017] The iron ore powder coal gasification suspension pre-reduction and suspension smelting method is that the iron ore powder injection inlet is the system after the lateral opening of the ascending flue, and the pressure head and air volume of the induced draft fan are adjusted to control the negative pressure operation. The negative pressure zero point position is at the lower part of the pre-reduction furnace, and the negative pressure is used to keep the pre-reduced iron ore powder running upward.

[0018] The iron ore pulverized coal gasification suspension pre-reduction and suspension smelting method has a suspension pre-reduction reaction time of 3-6 seconds and an air flow velocity of 3-4 m / s in the suspension pre-reduction section.

[0019] The method for the suspended pre-reduction and suspended smelting of iron ore powder is characterized in that the amount of hydrogen injected from the hydrogen injection port is 0-200m3 / t of ore powder. 3The water content of the iron ore powder injected from the iron ore powder injection port is 1-10%; the amount of water vapor injected from the water vapor inlet is 0-200 kg per ton of iron ore powder.

[0020] In the iron ore powder coal gasification suspension pre-reduction and suspension smelting method, the induced draft fan, the iron ore powder injection system and the water vapor injection system are interlocked. When starting up, the induced draft fan is turned on first, and the iron ore powder or water vapor injection system is turned on after the negative pressure is stable; when shutting down, the iron ore powder or water vapor injection system is turned off first and then the induced draft fan.

[0021] The technical features and beneficial effects of the present invention are:

[0022] (1) The high-temperature coal gas of 1200-1500℃ produced by coal gasification suspension smelting is used to pre-reduce iron ore powder, thereby improving the thermal utilization efficiency of waste heat;

[0023] (2) The pre-reduced hot pre-reduced ore powder is directly fed into the suspension smelting furnace for suspension smelting, thereby improving the energy utilization rate and the efficiency of coal gasification suspension smelting;

[0024] (3) The iron ore powder inlet and the subsequent system of the integrated device are operated under negative pressure, which reduces environmental pollution;

[0025] (4) The present invention uses the waste heat of high-temperature coal gas in the ascending flue of suspension smelting to pre-reduce iron ore powder, and does not require special pre-reduction equipment, special reducing agents and heat. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a flowchart of the integrated process of coal gasification suspension pre-reduction and suspension smelting of the present invention.

[0027] Figure 2 It is a schematic diagram of the coal gasification suspension pre-reduction and suspension smelting integrated device of the present invention.

[0028] In the figure: 1. pulverized coal inlet; 2. pure oxygen inlet; 3. hot pre-reduction ore powder inlet; 4. suspension smelting furnace; 5. molten pool; 6. slag outlet; 7. molten iron outlet; 8. ascending flue; 9. pre-reduction furnace; 10. iron ore powder inlet; 11. hydrogen inlet; 12. water vapor inlet; 13. primary cyclone separator; 14. secondary cyclone separator; 15. hot pre-reduction ore powder storage tank; 16. screw conveyor; 17. waste heat recovery device; 18. bag dust collector; 19. induced draft fan; 20. coal gas treatment and utilization device. DETAILED DESCRIPTION

[0029] The present invention is further illustrated by the following examples, but is not limited to the following examples.

[0030] like Figure 1~2As shown, an integrated device for iron ore pulverized coal gasification suspension pre-reduction and suspension smelting comprises a descending suspension smelting furnace 4 located on the left side of the device and a molten pool 5 at its lower part, an ascending flue 8 located on the right side of the molten pool, and a side opening of the ascending flue 8 connected to a pre-reduction furnace 9; the top of the suspension smelting furnace has three-channel nozzles: a pure oxygen inlet 2, a pulverized coal inlet 1, and a hot pre-reduction ore powder inlet 3, and slag outlets 6 and molten iron outlets 7 are respectively provided on both sides of the molten pool; the pre-reduction furnace 9 has an iron ore powder inlet 10 at the bottom, a hydrogen inlet 11 at the lower part, and a water vapor inlet 12; inlet 12; the top outlet of the pre-reduction furnace is connected to a primary cyclone separator 13 and a secondary cyclone separator 14 in sequence; the bottom outlets of the primary cyclone separator 13 and the secondary cyclone separator 14 are connected to a hot pre-reduction ore powder storage tank 15, and the hot pre-reduction ore powder storage tank 15 is connected to a hot pre-reduction ore powder inlet 3 via a screw conveyor 16; the high-temperature coal gas outlet at the top of the secondary cyclone separator 14 is connected to a waste heat recovery device 17, a bag dust collector 18, an induced draft fan 19, and a coal gas finishing and utilization device 20 which are connected in sequence.

[0031] Furthermore, in the above device, the ascending flue on the right side of the molten pool is opened at a lateral opening equal to the height of the flue diameter at a position 1-1.5 meters above the molten pool, and the opening is connected to the ascending suspended pre-reduction furnace; the diameter of the suspended pre-reduction furnace is 1 / 4 smaller than the diameter of the flue; the height of the pre-reduction furnace is preferably such that the ascending iron ore powder stays for 3-6 seconds.

[0032] The present invention adopts the above-mentioned device to carry out the method for gasification suspension pre-reduction and suspension smelting of iron ore pulverized coal, which comprises the following steps:

[0033] (1) Start the coal gasification function of the integrated device, spray the pulverized coal and pure oxygen into the suspension smelting furnace 4 from the inlet on the top of the furnace body, and control the coal-oxygen ratio (the coal-oxygen ratio varies according to the type of coal, and the temperature is preferably kept stable at 1500°C) so that the temperature in the suspension smelting furnace is kept stable at 1500°C;

[0034] (2) At the beginning of the process of step (1), the slag outlet and the molten iron outlet on the molten pool are opened, and when the molten pool temperature stabilizes at 1500°C, the slag outlet and the molten iron outlet are closed;

[0035] (3) When the temperature of the pre-reduction furnace reaches 1500°C stably, the induced draft fan is turned on. After the negative pressure is stabilized, iron ore powder is sprayed from the iron ore powder inlet, hydrogen is sprayed from the hydrogen inlet, and water vapor is sprayed from the water vapor inlet to cause the iron ore powder to undergo a pre-reduction reaction;

[0036] (4) The high-temperature coal gas carrying the pre-reduced iron ore powder enters the two-stage cyclone separator from the top outlet of the pre-reduction furnace to separate and collect the pre-reduced ore powder, and the collected pre-reduced ore powder enters the hot pre-reduced ore powder storage tank;

[0037] (5) The hot pre-reduction ore powder is sent from the hot pre-reduction ore powder storage tank to the hot pre-reduction ore powder inlet at the top of the suspension smelting furnace by a screw conveyor, and sprayed into the smelting furnace together with coal powder and pure oxygen for coal gasification suspension smelting reduction smelting;

[0038] (6) The high-temperature coal gas coming out of the upper outlet of the secondary cyclone separator enters the waste heat recovery device to recover the waste heat. The coal gas after waste heat utilization enters the coal gas finishing and utilization device after dust removal.

[0039] The specific process flow in the above method is described as follows:

[0040] In the iron ore pulverized coal gasification suspension pre-reduction and suspension smelting method, the inlet temperature of the primary cyclone separator is controlled below 600°C.

[0041] In the above method, the iron ore powder is sprayed into the system after the lateral opening of the ascending flue, and the pressure head and air volume of the induced draft fan are adjusted to control the negative pressure operation. The negative pressure zero point position is at the lower part of the pre-reduction furnace, and the negative pressure is used to keep the iron ore powder running upward.

[0042] In the above method, the suspension pre-reduction reaction time is 3-6 seconds, and the air flow velocity in the suspension pre-reduction section is 3-4 m / s.

[0043] In the above method, the amount of hydrogen injected from the hydrogen nozzle is 0-200m 3 The water content of the iron ore powder injected from the iron ore powder injection port is 1-10%; the amount of water vapor injected from the water vapor inlet is 0-200 kg per ton of iron ore powder.

[0044] In the above method, the induced draft fan, the iron ore powder injection system and the water vapor injection system are interlocked. When starting up, the induced draft fan is turned on first, and the iron ore powder or water vapor injection system is turned on after the negative pressure is stable; when shutting down, the iron ore powder or water vapor injection system is turned off first and then the induced draft fan.

[0045] The following is a detailed description of the method for the above-mentioned complete set of equipment for the gasification suspension pre-reduction and suspension smelting of pulverized coal of iron ore through a specific implementation process.

[0046] Embodiment 1:

[0047] The pulverized coal and oxygen are fed into the coal gasification suspension smelting furnace 4 from the device inlet, and the furnace temperature is controlled at 1500°C. At the same time, the entire suspension pre-reduction and suspension smelting device is heated to 1500°C; the iron ore powder is sprayed into the pre-reduction furnace 9 from the iron ore powder inlet 10; hydrogen is sprayed from the hydrogen inlet 11, and the injection amount is 100m 3; The amount of water vapor injected from the water vapor inlet 12 is 50 kg; the induced draft fan and the iron ore powder injection system and the water vapor injection system are interlocked. When the furnace is started, the induced draft fan is turned on first, and the iron ore powder and water vapor injection system are turned on after the negative pressure is stable. When the furnace is stopped, the iron ore powder or water vapor injection system is turned off first and then the induced draft fan; the water content of the injected iron ore powder is 10%; the pressure head and air volume of the induced draft fan are adjusted to control the iron ore powder pre-reduction system to negative pressure operation, and the negative pressure zero point position is at the lower part of the pre-reduction furnace, and the negative pressure is to keep the iron ore powder running upward; during the suspension pre-reduction reaction The time interval is 3 seconds, and the air flow velocity in the suspension pre-reduction section is not less than 4 m / s; the hot pre-reduced iron ore powder collected at the lower port of the two-stage cyclone separator is transported from the hot pre-reduction ore powder storage tank 15 to the hot pre-reduction ore powder inlet 3 via the screw conveyor 16, and is sprayed into the suspension smelting furnace through the three-channel nozzle together with coal powder and pure oxygen for suspension smelting; the high-temperature coal gas from the upper port of the secondary cyclone separator 14 is sent to the waste heat recovery device 17 to recover waste heat, sent to the bag dust collector 18 to collect dust, and sent to the coal gas finishing and utilization device 20 through the induced draft fan 19 for finishing and utilization.

[0048] Embodiment 2:

[0049] The pulverized coal and oxygen are fed into the coal gasification suspension smelting device 4 from the inlets of the devices 1 and 2, and the furnace temperature is controlled at 1500°C. At the same time, the entire suspension pre-reduction and suspension smelting device is heated to 1500°C; the iron ore powder is sprayed into the pre-reduction furnace 9 from the iron ore powder inlet 10; hydrogen is sprayed into the hydrogen inlet 11, and the injection amount is 0m 3 ; The amount of water vapor injected from the water vapor inlet 12 is 200 kg; the induced draft fan and the iron ore powder injection system and the water vapor injection system are interlocked. When the furnace is opened, the induced draft fan is opened first, and the iron ore powder and water vapor injection system are opened after the negative pressure is stable. When the furnace is stopped, the iron ore powder or water vapor injection system is closed first and then the induced draft fan; the water content of the injected iron ore powder is 1%; the pressure head and air volume of the induced draft fan are adjusted to control the pre-reduction furnace to negative pressure operation, and the negative pressure zero point position is at the lower part of the pre-reduction furnace. The negative pressure strength is to keep the iron ore powder running upward; the suspension pre-reduction reaction time is 3 seconds, and the air flow speed in the suspension pre-reduction section is 4 m / s; the hot pre-reduced iron ore powder collected at the lower ports of the two-stage cyclone separators 13 and 14 is transported from the hot pre-reduced iron ore powder storage tank 15 to the hot pre-reduced ore powder inlet 3 via the screw conveyor 16, and is sprayed into the suspension smelting furnace through the three-channel nozzle together with coal powder and pure oxygen for suspension smelting; the high-temperature coal gas from the upper port of the secondary cyclone separator 14 is sent to the waste heat recovery device 17 to recover waste heat, sent to the bag dust collector 18 to collect dust, and sent to the coal gas finishing device 20 through the induced draft fan 19 for finishing and utilization.

[0050] Embodiment three:

[0051] The pulverized coal and oxygen are fed into the coal gasification suspension smelting device 4 from the inlets of the devices 1 and 2, and the furnace temperature is controlled at 1500°C. At the same time, the entire suspension pre-reduction and suspension smelting device is heated to 1500°C; the iron ore powder is sprayed into the pre-reduction furnace 9 from the iron ore powder inlet 10; hydrogen is sprayed into the hydrogen inlet 11, and the injection amount is 50m 3 ; The amount of water vapor injected from the water vapor inlet 12 is 30 kg; the induced draft fan and the iron ore powder injection system and the water vapor injection system are interlocked. When the furnace is opened, the induced draft fan is opened first, and the iron ore powder and water vapor injection system are opened after the negative pressure is stable. When the furnace is stopped, the iron ore powder or water vapor injection system is closed first and then the induced draft fan; the water content of the injected iron ore powder is 5%; the pressure head and air volume of the induced draft fan are adjusted to control the pre-reduction furnace to negative pressure operation, and the negative pressure zero point position is at the lower part of the pre-reduction furnace, and the negative pressure is to keep the iron ore powder running upward; the suspension pre-reduction reaction time is 4 seconds The air flow velocity of the suspension pre-reduction section is 3 m / s; the hot pre-reduced iron ore powder collected at the lower ports of the two-stage cyclone separators 13 and 14 is transported from the hot pre-reduced iron ore powder storage tank 15 to the hot pre-reduction ore powder inlet 3 via the screw conveyor 16, and is sprayed into the suspension smelting furnace through the three-channel nozzle with coal powder and pure oxygen for suspension smelting; the high-temperature coal gas from the upper port of the secondary cyclone separator 14 is sent to the waste heat recovery device 17 to recover waste heat, sent to the bag dust collector 18 to collect dust, and sent to the coal gas finishing device 20 through the induced draft fan 19 for finishing and utilization.

[0052] Embodiment 4:

[0053] The pulverized coal and oxygen are fed into the coal gasification suspension smelting device 4 from the inlets of the devices 1 and 2, and the furnace temperature is controlled at 1500°C. At the same time, the entire suspension pre-reduction and suspension smelting device is heated to 1500°C; the iron ore powder is sprayed into the pre-reduction furnace 9 from the iron ore powder inlet 10; hydrogen is sprayed into the hydrogen inlet 11, and the injection amount is 100m 3 ; The amount of water vapor injected from the water vapor inlet 12 is 120 kg; the induced draft fan and the iron ore powder injection system and the water vapor injection system are interlocked. When the furnace is opened, the induced draft fan is opened first, and the iron ore powder and water vapor injection system are opened after the negative pressure is stable. When the furnace is stopped, the iron ore powder or water vapor injection system is closed first and then the induced draft fan; the water content of the injected iron ore powder is 4%; the pressure head and air volume of the induced draft fan are adjusted to control the pre-reduction furnace to negative pressure operation, and the negative pressure zero point position is at the lower part of the pre-reduction furnace, and the negative pressure is to keep the iron ore powder running upward; the suspension pre-reduction reaction time is 4 seconds, and the air flow velocity in the suspension pre-reduction section is 3 m / s; the hot pre-reduced iron ore powder collected at the lower ports of the two-stage cyclone separators 13 and 14 is transported from the hot pre-reduced iron ore powder storage tank 15 to the hot pre-reduced ore powder inlet 3 via the screw conveyor 16, and is sprayed into the suspension smelting furnace through the three-channel nozzle together with coal powder and pure oxygen for suspension smelting; the high-temperature coal gas from the upper port of the secondary cyclone separator 14 is sent to the waste heat recovery device 17 to recover waste heat, sent to the bag dust collector 18 to collect dust, and sent to the coal gas finishing device 20 through the induced draft fan 19 for finishing and utilization.

[0054] Embodiment five:

[0055] The pulverized coal and pure oxygen are fed into the coal gasification suspension smelting device 4 from the inlets of the devices 1 and 2, and the furnace temperature is controlled at 1500°C. At the same time, the entire suspension pre-reduction and suspension smelting device is heated to 1500°C; the iron ore powder is sprayed into the pre-reduction furnace 9 from the iron ore powder inlet 10; and the hydrogen inlet 11 is sprayed with a hydrogen volume of 0m 3 ; The amount of water vapor injected from the water vapor inlet 12 is 150 kg; the induced draft fan, the iron ore powder injection system and the water vapor injection system are interlocked. When starting the furnace, the induced draft fan is turned on first, and then the iron ore powder and water vapor injection system are turned on after the negative pressure is stable. When stopping the furnace, the iron ore powder or water vapor injection system is turned off first and then the induced draft fan. The water content of the injected iron ore powder is 1%; the pressure head and air volume of the induced draft fan are adjusted to control the pre-reduction furnace to operate at negative pressure, and the negative pressure zero point is located at the lower part of the pre-reduction furnace, and the negative pressure is to keep the iron ore powder running upward; the suspension pre-reduction reaction time is 4 seconds, and the air flow velocity of the suspension pre-reduction section is 4 m / s; the hot pre-reduction iron ore powder collected at the lower outlets of the two-stage cyclone separators 13 and 14 is transported from the hot pre-reduction iron ore powder storage tank 15 to the hot pre-reduction ore powder inlet 3 via a screw conveyor 16, and is sprayed into the suspension smelting furnace through a three-channel nozzle with coal powder and pure oxygen for suspension smelting; the high-temperature coal gas from the upper outlet of the secondary cyclone separator 14 enters the waste heat recovery device 17 to recover waste heat, enters the bag dust collector 18 to collect dust, and enters the coal gas finishing device 20 through the induced draft fan 19 for finishing and utilization.

Claims

1. An integrated device for gasification, suspension pre-reduction and suspension smelting of iron ore pulverized coal, characterized in that: The left side of the device is a descending coal gasification suspension smelting furnace, the lower part is a molten pool, and the right side of the molten pool is an ascending flue and a suspension pre-reduction furnace; The top of the coal gasification suspension smelting reduction smelting furnace is provided with three-channel nozzles for oxygen, coal powder and hot pre-reduced iron ore powder; the molten pool at the bottom of the furnace body is provided with a slag outlet, a molten iron outlet and a coal gas injection inlet; The ascending flue on the right side of the molten pool opens laterally at a height 1 meter above the molten pool to the same height as the flue diameter, and is connected to the ascending suspended pre-reduction furnace; the diameter of the suspended pre-reduction furnace is 1 / 4 smaller than the diameter of the ascending flue, and an inlet nozzle for iron ore powder, water vapor and hydrogen is provided at the bottom of the suspended pre-reduction furnace; the residence time of the ascending iron ore powder in the suspended pre-reduction furnace is 4-6 seconds, and a two-stage cyclone separator is connected to the outside of the suspended pre-reduction furnace.

2. The integrated device for gasification, suspension pre-reduction and suspension smelting of iron ore and pulverized coal according to claim 1 is characterized in that: The lower opening of the cyclone separator is connected to an intermediate storage tank for reduced hot ore powder, and the intermediate storage tank is connected to an inlet of hot pre-reduced iron ore powder at the top of the coal gasification suspension smelting reduction smelting furnace by a spiral conveying pipeline.

3. The integrated device for gasification, suspension pre-reduction and suspension smelting of iron ore and pulverized coal according to claim 1 is characterized in that: The upper port of the secondary cyclone separator is connected to a high-temperature coal gas waste heat utilization device, and the waste heat utilization device is connected to a dust removal device, an induced draft fan and a coal gas finishing and utilization device in sequence.

4. A method for gasification, suspension pre-reduction and suspension smelting of iron ore pulverized coal, using the integrated device for gasification, suspension pre-reduction and suspension smelting of iron ore pulverized coal according to any one of claims 1 to 3, characterized in that: ⑴ Start the coal gasification function of the integrated device, spray pulverized coal and pure oxygen into the furnace from the nozzle on the top of the furnace, and control the coal-oxygen ratio to stabilize the temperature in the double suspension smelting furnace to 1500℃; At the beginning of this process, the slag outlet and molten iron outlet on the molten pool are opened, and when the molten pool temperature stabilizes at 1500°C, the slag outlet and molten iron outlet are closed; When the temperature of the pre-reduction furnace reaches 1500°C stably, the induced draft fan is started first. After the negative pressure is stabilized, iron ore powder is sprayed from the iron ore powder inlet at the bottom of the pre-reduction furnace, water vapor is sprayed from the water vapor inlet, and hydrogen is sprayed from the hydrogen inlet to make the iron ore powder undergo a pre-reduction reaction; The high-temperature coal gas carrying the pre-reduced iron ore powder enters the two-stage cyclone separator to separate and collect the pre-reduced ore powder, and the collected pre-reduced ore powder enters the hot pre-reduced ore powder intermediate storage tank; The hot pre-reduced ore powder is sent from the hot pre-reduced ore powder intermediate storage tank to the hot pre-reduced iron ore powder nozzle on the top of the coal gasification suspension smelting reduction smelting furnace by a screw conveyor, and is sprayed into the smelting furnace together with coal powder and pure oxygen for coal gasification suspension smelting reduction smelting; The high-temperature coal gas coming out of the upper outlet of the secondary cyclone separator enters the waste heat utilization device to recover the waste heat, and the coal gas after waste heat utilization enters the coal gas finishing and utilization device after dust removal.

5. The method for iron ore pulverized coal gasification suspension pre-reduction and suspension smelting according to claim 4, characterized in that: The inlet temperature of the first-stage cyclone separator is controlled below 600°C.

6. The method for iron ore pulverized coal gasification suspension pre-reduction and suspension smelting according to claim 4, characterized in that: The suspension pre-reduction reaction time is 3-6 seconds, and the air flow velocity in the suspension pre-reduction section is 3-4 m / s.

7. The method for iron ore pulverized coal gasification suspension pre-reduction and suspension smelting according to claim 4, characterized in that: The amount of hydrogen injected from the hydrogen injection port is 0-200m3 / ton of iron ore powder. 3 The water content of the iron ore powder injected from the iron ore powder injection port is 1-10%; the amount of water vapor injected from the water vapor port is 0-200 kg per ton of iron ore powder.

8. The method for iron ore pulverized coal gasification suspension pre-reduction and suspension smelting according to claim 4, characterized in that: The induced draft fan, iron ore powder injection system and water vapor injection system are interlocked. When starting the furnace, turn on the induced draft fan first, and then turn on the iron ore powder or water vapor injection system after the negative pressure stabilizes. When stopping the furnace, turn off the iron ore powder or water vapor injection system first and then turn off the induced draft fan.

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