Flash reduction device and method integrating coal-to-reducing gas and flash reduction

Abstract

The invention relates to the technical field of flash reduction processes, and discloses a coal-based reducing gas and flash reduction integrated flash reduction device and method.The coal-based reducing gas and flash reduction integrated flash reduction device comprises a coal-based gas tower body and a flash reduction tower body, the coal-based gas tower body is communicated with the flash reduction tower body through a molten pool, and the coal-based gas tower body is used for conveying reducing gas to the flash reduction tower body; the injection assembly comprises a fine ore injection part and a fine ore injection device, the fine ore injection part is arranged on the flash reduction tower body, the fine ore injection device is arranged on the fine ore injection part, and the fine ore injection part is used for conveying fine iron ore and flux into the flash reduction tower body; the circulating assembly comprises a cyclone dust collector, a circulating part and a dedusting ash blowing part, the cyclone dust collector is communicated with the flash reduction tower body, the circulating part is arranged on the cyclone dust collector and is communicated with the flash reduction tower body through the dedusting ash blowing part, and the dedusting ash blowing part is used for conveying dedusting ash into the flash reduction tower body. The process is simplified, raw materials are saved, and production efficiency and raw material utilization rate are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of flash reduction technology, and in particular to a flash reduction device and method integrating coal-based reducing gas and flash reduction. Background Art

[0002] Flash reduction is a second-level reduction process of iron ore powder at 1200-1400℃. Flash reduction requires that the effective components of the reducing gas (CO+H2)>90%, and the reaction temperature of the reducing gas must reach above 1200℃, so that flash reduction under engineering production conditions can occur.

[0003] China has abundant coal resources but scarce natural gas resources, so using coal resources as a source of reducing gas is economically feasible and in line with my country's national conditions. The preparation of high-temperature reducing gas in a traditional flash reduction furnace and the flash reduction of iron ore concentrate cannot be achieved in one device, and the process is complex, and the utilization rate and efficiency of raw materials are low.

[0004] Therefore, there is an urgent need for a flash reduction device and method that integrates coal-based reducing gas and flash reduction to solve the above problems. Summary of the invention

[0005] The object of the present invention is to provide a flash reduction device and method integrating coal-based reducing gas and flash reduction, so as to solve the problems existing in the above-mentioned prior art.

[0006] To achieve the above object, the present invention provides the following solution: The present invention provides a flash reduction device integrating coal-based reducing gas and flash reduction, comprising a coal-based gasification tower body and a flash reduction tower body, and further comprising:

[0007] A molten pool, wherein the coal gasification tower body is connected to the flash reduction tower body through the molten pool, and the coal gasification tower body is used to transport reducing gas to the flash reduction tower body;

[0008] The spraying assembly comprises a powder ore spraying member and a powder ore spraying device, wherein the powder ore spraying member is arranged on the flash reduction tower body, and the powder ore spraying device is arranged on the powder ore spraying member, and the powder ore spraying member is used to transport iron powder ore and flux into the flash reduction tower body;

[0009] A circulation component includes a cyclone dust collector, a circulation part and a dust ash blowing part. The cyclone dust collector is connected to the flash reduction tower body. The circulation part is arranged on the cyclone dust collector, and the circulation part is connected to the flash reduction tower body through the dust ash blowing part. The dust ash blowing part is used to transport dust ash into the flash reduction tower body.

[0010] Preferably, the powder ore blowing component includes a powder ore blowing ring tube, which is sleeved on the flash reduction tower body, and one end of a plurality of powder ore nozzles are fixedly connected and connected at equal intervals along the circumferential direction on the inner side wall of the powder ore blowing ring tube, and the other end of the powder ore nozzle is connected to the flash reduction tower body, and the powder ore blowing device is arranged on the powder ore blowing ring tube.

[0011] Preferably, the circulation part includes a cyclone ash bin fixedly connected to the bottom end of the cyclone dust collector, the bottom end of the cyclone ash bin is fixedly connected to a dust ash blowing device, the dust ash blowing device is connected to the dust ash blowing part, and the dust ash blowing device is connected to external nitrogen.

[0012] Preferably, the dust removal ash blowing component includes a dust removal ash blowing ring pipe, which is sleeved on the flash reduction tower body, and one end of a plurality of dust removal nozzles are fixedly connected and connected at equal intervals along the circumferential direction on the inner side wall of the dust removal ash blowing ring pipe, and the other end of the dust removal nozzle is connected to the flash reduction tower body, and the dust removal ash blowing ring pipe is fixedly connected to the dust removal ash blowing device.

[0013] Preferably, the number of the powder ore nozzles and the dust ash removal nozzles is 4-8.

[0014] Preferably, the spraying angles of the powder ore nozzle and the dust ash nozzle are 30-45° downward in the horizontal direction.

[0015] Preferably, an iron hole, a slag hole and a plurality of oxygen-coal lances are provided on the side walls of the molten pool, and the plurality of oxygen-coal lances are arranged on the molten pool at equal intervals along the circumferential direction.

[0016] Preferably, the number of the oxygen-coal guns is 6-8.

[0017] Preferably, the flash reduction tower body is connected to the cyclone dust collector through a high-temperature flue gas heat exchanger.

[0018] A flash reduction method integrating coal-based reducing gas and flash reduction comprises the following steps:

[0019] The reducing gas produced by the coal gasification tower body is transported into the flash reduction tower body through the molten pool;

[0020] The iron ore powder and the solvent are transported into the flash reduction tower body through the iron ore powder injection device and the iron ore powder injection member to react with the reducing gas;

[0021] The coal gas and dust generated by the flash reduction tower body enter the cyclone dust collector for dust removal;

[0022] The dust ash produced by the cyclone dust collector is transported into the flash reduction tower body through the circulation part and the dust ash blowing part for secondary reduction and high-temperature melting.

[0023] Compared with the prior art, the present invention has the following advantages and technical effects:

[0024] The present invention provides a flash reduction device and method integrating coal-based reducing gas and flash reduction. The coal gasification tower body, the flash reduction tower body and the molten pool form an integrated structure. The reducing gas in the coal gasification tower body is transported to the flash reduction tower body through the molten pool. At the same time, iron ore powder and flux are transported to the flash reduction tower body through the powder ore blowing device and the powder ore blowing member to react with the reducing gas. The iron oxide in the iron ore powder is rapidly reduced to metallic iron within a few seconds and then falls into the molten pool to complete the separation of slag and iron. The coal gas and dust generated in the flash reduction tower body enter the cyclone dust collector for dust removal. The cyclone dust ash generated by the cyclone dust collector is transported to the flash reduction tower body again through the circulation member and the dust ash blowing member for secondary reduction and high-temperature melting. The present invention enables the preparation of high-temperature reducing gas and the flash reduction of iron ore concentrate to be realized in one device, thereby simplifying the process and improving production efficiency. At the same time, the cyclone dust removal ash carried away in the coal gas can also be self-circulated and re-enter the furnace for solid waste treatment, so that the cyclone dust removal ash can achieve self-circulation treatment and zero emission, and the high-temperature flue gas generated in the reduction process is fully utilized, thereby improving heat utilization efficiency, saving raw materials, and improving the utilization rate of raw materials. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative labor:

[0026] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0027] Figure 2 This is a working diagram of a flash reduction device integrating coal-based reducing gas and flash reduction according to the present invention;

[0028] Figure 3 This is a structural diagram of Embodiment 2 of the present invention;

[0029] Figure 4 This is a schematic diagram of the meshing state of the gear and the toothed plate in the second embodiment of the present invention;

[0030] Among them, 1. coal gasification tower body; 2. flash reduction tower body; 3. molten pool; 4. powder ore injection device; 5. cyclone dust collector; 6. powder ore injection ring pipe; 7. powder ore nozzle; 8. cyclone ash bin; 9. dust ash injection device; 10. dust ash injection ring pipe; 11. dust ash nozzle; 12. iron mouth; 13. slag mouth; 14. oxygen-coal gun; 15. high-temperature flue gas heat exchanger; 16. dust ash bin upper valve; 17. dust ash bin lower valve; 18. furnace top coal gasification oxygen-coal gun; 19. support ring; 20. support frame; 21. gear plate; 22. support shaft; 23. gear; 24. adjustment plate; 25. slide; 26. regulating valve. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0032] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0033] Embodiment 1:

[0034] Reference Figure 1-Figure 2 The present invention provides a flash reduction device integrating coal-based reducing gas and flash reduction, comprising a coal-based gasification tower body 1 and a flash reduction tower body 2, and further comprising:

[0035] The coal gasification tower body 1 is connected with the flash reduction tower body 2 through the molten pool 3, and the coal gasification tower body 1 is used to transport reducing gas to the flash reduction tower body 2;

[0036] The spraying assembly includes a powder ore spraying member and a powder ore spraying device 4, wherein the powder ore spraying member is arranged on the flash reduction tower body 2, and the powder ore spraying device 4 is arranged on the powder ore spraying member, and the powder ore spraying member is used to transport iron powder ore and flux into the flash reduction tower body 2;

[0037] The circulation component includes a cyclone dust collector 5, a circulation part and a dust ash blowing part. The cyclone dust collector 5 is connected to the flash reduction tower body 2. The circulation part is arranged on the cyclone dust collector 5, and the circulation part is connected to the flash reduction tower body 2 through the dust ash blowing part. The dust ash blowing part is used to transport dust ash into the flash reduction tower body 2.

[0038] To further optimize the solution, the powder ore blowing parts include a powder ore blowing ring pipe 6, which is sleeved on the flash reduction tower body 2, and one end of a plurality of powder ore nozzles 7 are fixedly connected and connected at equal intervals along the circumferential direction on the inner wall of the powder ore blowing ring pipe 6, and the other end of the powder ore nozzle 7 is connected to the flash reduction tower body 2, and the powder ore blowing device 4 is arranged on the powder ore blowing ring pipe 6.

[0039] The iron ore powder and flux are sprayed into the powder ore spraying ring pipe 6 through the powder ore spraying device 4 and transported to the flash reduction tower body 2 through the powder ore spraying nozzle 7 .

[0040] To further optimize the solution, the circulation part includes a cyclone ash bin 8 fixedly connected to the bottom end of the cyclone dust collector 5, a dust ash blowing device 9 is fixedly connected to the bottom end of the cyclone ash bin 8, the dust ash blowing device 9 is connected to the dust ash blowing part, and the dust ash blowing device 9 is connected to the external nitrogen.

[0041] The cyclone dust produced by the cyclone dust collector 5 is transported to the dust ash blowing device 9, and is transported to the dust ash blowing part by transporting nitrogen.

[0042] A further optimized solution is provided, in which the dust removal ash blowing component comprises a dust removal ash blowing ring pipe 10, which is sleeved on the flash reduction tower body 2, and the inner wall of the dust removal ash blowing ring pipe 10 is fixedly connected and connected with one end of a plurality of dust removal ash nozzles 11 at equal intervals in the circumferential direction, and the other end of the dust removal nozzle 11 is connected with the flash reduction tower body 2, and the dust removal ash blowing ring pipe 10 is fixedly connected to the dust removal ash blowing device 9.

[0043] The dust removal ash blowing device 9 transports the dust removal ash into the dust removal ash blowing ring pipe 10, and transports the dust removal ash into the flash reduction tower body 2 through a plurality of dust removal ash nozzles 11 for secondary reaction.

[0044] According to a further optimization scheme, the number of the powder ore nozzles 7 and the dust removal nozzles 11 is 4-8.

[0045] In order to ensure the uniformity of feeding powder ore and flux, the number of powder ore nozzles 7 is preferably 6, and in order to ensure the uniformity of cyclone dust removal ash blowing, the number of dust removal ash nozzles 11 is preferably 4.

[0046] According to a further optimization scheme, the spraying angles of the powder ore nozzle 7 and the dust removal nozzle 11 are 30-45° downward in the horizontal direction.

[0047] In order to ensure uniform feeding of powder ore and flux, the spraying angle of powder ore nozzle 7 is 30° downward from the horizontal. In order to ensure uniform blowing of cyclone dust removal ash, the spraying angle of dust removal ash nozzle 11 is preferably 30° upward from the horizontal.

[0048] According to a further optimized solution, an iron hole 12, a slag hole 13 and a plurality of oxygen-coal lances 14 are provided on the side wall of the molten pool 3, and the plurality of oxygen-coal lances 14 are arranged on the molten pool 3 at equal intervals along the circumferential direction.

[0049] According to a further optimization scheme, the number of oxygen-coal guns 14 is 6-8.

[0050] According to a further optimized solution, the flash reduction tower body 2 is connected to the cyclone dust collector 5 via a high-temperature flue gas heat exchanger 15 .

[0051] The high-temperature flue gas heat exchanger 15 is provided to exchange heat between the coal gas and the dust to reduce their temperature.

[0052] Further optimization scheme, coal gasification tower body 1 is circular, with a diameter of 2-3 meters, and a tower cavity height of 6-8 meters. Flash reduction tower body 2 is circular, with a diameter of 5-8 meters. The distance from the top of molten pool 3 to the top of flash reduction tower body 2 is not less than 30 meters, the distance from the top of molten pool 3 to powder ore nozzle 7 is not less than 12 meters, and the distance from the top of molten pool 3 to dust removal nozzle 11 is not less than 8 meters.

[0053] A flash reduction method integrating coal-based reducing gas and flash reduction comprises the following steps:

[0054] The reducing gas produced by the coal gasification tower body 1 is transported to the flash reduction tower body 2 through the molten pool 3;

[0055] The coal gasification tower body 1 is provided with a furnace top coal gasification oxygen coal lance 18, and the reducing gas generated by the furnace top coal gasification oxygen coal lance 18 is transported to the cavity in the flash reduction tower body 2 through the molten pool 3;

[0056] The iron ore powder and the solvent are transported to the flash reduction tower body 2 through the powder ore blowing device 4 and the powder ore blowing parts to react with the reducing gas;

[0057] Iron ore powder and flux are sprayed into the powder ore injection ring pipe 6 through the powder ore injection device 4, and then sprayed into the flash reduction tower body 2 through a plurality of powder ore nozzles 7, so that the powdered iron ore with a large specific surface area and in a floating state moves towards the reducing gas, forming extremely favorable chemical kinetic conditions. The iron oxides in the iron ore powder are rapidly reduced to metallic iron within a few seconds, and then fall into the molten pool 3 at the bottom of the flash reduction tower body 2 to complete the separation of iron and slag, and are discharged from the iron mouth 12 and the slag mouth 13 respectively.

[0058] The coal gas and dust generated by the flash reduction tower 2 enter the cyclone dust collector 5 for dust removal;

[0059] The coal gas and dust generated by the flash reduction tower body 2 first pass through the high-temperature flue gas heat exchanger 15 for heat exchange to reduce the temperature to below 400°C, and then enter the cyclone dust collector 5 for dust removal. The coal gas after cyclone dust removal leaves the cyclone dust collector 5 and continues to undergo coal gas purification treatment and subsequent processes.

[0060] The dust produced by the cyclone dust collector 5 is transported to the flash reduction tower body 2 through the circulation part and the dust blowing part for secondary reduction and high-temperature melting.

[0061] The cyclone dust dust generated by the cyclone dust collector 5 is put into the cyclone ash bin 8 through the upper valve 16 of the dust ash bin. After the dust dust of the cyclone dust collector 5 is emptied, the upper valve 16 of the dust ash bin is closed, and the lower valve 17 of the dust ash bin is opened. The cyclone dust dust is sent to the dust ash injection ring pipe 10 by nitrogen with the help of the dust ash injection device 9, and then sprayed into the flash reduction tower body 2 through the dust ash nozzle 11 for secondary reduction and high-temperature melting.

[0062] In one embodiment of the present invention, on the left is a circular coal gasification tower body 1 with an inner diameter of 2.0 meters. The coal gasification tower body 1 uses dry coal powder gasification to produce high-temperature reducing gas, and the furnace top coal gasification oxygen coal gun 18 is used to achieve the preparation of effective reducing gas (CO+H2)>90% at a temperature not lower than 1350°C. In order to fully carry out coal gasification, the inner cavity height of the coal gasification tower body 1 is 7 meters. On the right is a circular flash reduction tower body 2 with an inner diameter of 6.5 meters.

[0063] Powder ore and flux are sprayed into the flash reduction tower 2. In order to ensure the uniformity of feeding powder ore and flux, four powder ore nozzles 7 are provided, and the proportion of powder ore with a particle size less than 200 mesh sprayed by the powder ore nozzles 7 is greater than 75%. The spraying angle of the powder ore nozzles 7 is 30° downward in the horizontal direction.

[0064] In one embodiment of the present invention, the dust removal ash spraying height is 8 meters. In order to ensure the uniformity of the cyclone dust removal ash spraying, four dust removal ash nozzles 11 are provided, and the spraying angle of the dust removal ash nozzles 11 is 30° upward in the horizontal direction.

[0065] The above embodiment provides a flash reduction device and method integrating coal-based reducing gas and flash reduction, which solves the problem of low reduction efficiency when coal-based reducing gas and flash reduction move in the same side in the downstream direction. By separating the coal-based gasification tower body 1 and the flash reduction tower body 2, the engineering integration of coal-based reducing gas and flash reduction is achieved in engineering. The high-temperature reducing gas moves from bottom to top in the flash reduction tower, and the iron ore concentrate moves from top to bottom. The gas and solid move in countercurrent, so that the high-temperature reducing gas is produced from coal while the flash reduction of the iron ore powder is completed. The high-temperature reducing gas equipment and the flash reduction of the iron ore concentrate can be realized in one reduction tower, which simplifies the flash reduction process and improves production efficiency. At the same time, the cyclone dust removal ash carried away in the coal gas can also be self-circulated and re-enter the flash reduction tower body 2 for solid waste treatment, so that the cyclone dust removal ash can achieve self-circulation treatment and zero emission.

[0066] Embodiment 2:

[0067] Reference Figure 3In this embodiment, an adjustment component is provided between the powder ore injection ring pipe 6 and the dust removal ash injection ring pipe 10, and the adjustment component includes a support ring 19 fixedly connected to the coal gas tower body 1, and a plurality of support frames 20 are fixedly connected to the support ring 19 along the circumferential direction. The number of the support frames 20 is the same as the number of the powder ore nozzles 7 and the dust removal ash nozzles 11;

[0068] Tooth plates 21 are slidably connected to both sides of the support frame 20, and a support shaft 22 is rotatably connected to the middle of the support frame 20. A gear 23 is fixedly connected to the support shaft 22. The two tooth plates 21 are located on both sides of the gear 23 and are respectively meshed with the gear 23. Adjustment plates 24 are fixedly connected to the two tooth plates 21, and a slide groove 25 is provided on the adjustment plate 24. The powder ore nozzle 7 and the dust removal nozzle 11 are respectively hinged to the coal gasification tower body 1 and are slidably arranged in the slide groove 25.

[0069] Specifically, a regulating valve 26 is threadedly connected to the support frame 20, a rectangular limiting hole is opened at one end of the support shaft 22, a rectangular limiting plate is fixedly connected to one end of the regulating valve 26, the rectangular limiting plate is adapted to the rectangular limiting hole, and a scale is set on the regulating valve 26.

[0070] By rotating the regulating valve 26 to move on the support frame 20, the support shaft 22 is driven to rotate synchronously. When the support shaft 22 rotates, the gear 23 is driven to rotate. The rotation of the gear 23 drives the two tooth plates 21 to move synchronously in opposite directions. The two tooth plates 21 drive the powder ore nozzle 7 and the dust removal nozzle 11 to adjust the angle through the two adjustment plates 24 respectively.

[0071] In the description of the present invention, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0072] The embodiments described above are only descriptions of the preferred modes of the present invention, and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should all fall within the protection scope determined by the claims of the present invention.

Claims

1. A flash reduction device integrating coal-based reducing gas and flash reduction, comprising a coal-based gasification tower body (1) and a flash reduction tower body (2), characterized in that: Also includes: A molten pool (3), the coal gasification tower body (1) is connected to the flash reduction tower body (2) through the molten pool (3), and the coal gasification tower body (1) is used to transport reducing gas to the flash reduction tower body (2); The spraying assembly comprises a powder ore spraying member and a powder ore spraying device (4), wherein the powder ore spraying member is arranged on the flash reduction tower body (2), and the powder ore spraying device (4) is arranged on the powder ore spraying member, and the powder ore spraying member is used to transport iron powder ore and flux into the flash reduction tower body (2); A circulation component comprises a cyclone dust collector (5), a circulation component and a dust ash blowing component, wherein the cyclone dust collector (5) is connected to the flash reduction tower body (2), the circulation component is arranged on the cyclone dust collector (5), and the circulation component is connected to the flash reduction tower body (2) through the dust ash blowing component, and the dust ash blowing component is used to transport dust ash into the flash reduction tower body (2).

2. The flash reduction device integrating coal-based reducing gas and flash reduction according to claim 1, characterized in that: The powder ore blowing component comprises a powder ore blowing annular tube (6), the powder ore blowing annular tube (6) is sleeved on the flash reduction tower body (2), one end of a plurality of powder ore nozzles (7) are fixedly connected and connected at equal intervals along the circumferential direction on the inner side wall of the powder ore blowing annular tube (6), the other end of the powder ore nozzle (7) is connected to the flash reduction tower body (2), and the powder ore blowing device (4) is arranged on the powder ore blowing annular tube (6).

3. The flash reduction device integrating coal-based reducing gas and flash reduction according to claim 2, characterized in that: The circulation part comprises a cyclone ash bin (8) fixedly connected to the bottom end of the cyclone dust collector (5), the bottom end of the cyclone ash bin (8) is fixedly connected to a dust ash blowing device (9), the dust ash blowing device (9) is connected to the dust ash blowing part, and the dust ash blowing device (9) is connected to external nitrogen.

4. The flash reduction device integrating coal-based reducing gas and flash reduction according to claim 3, characterized in that: The dust removal ash blowing component comprises a dust removal ash blowing ring pipe (10), the dust removal ash blowing ring pipe (10) is sleeved on the flash reduction tower body (2), one end of a plurality of dust removal ash nozzles (11) are fixedly connected and connected at equal intervals along the circumferential direction on the inner side wall of the dust removal ash blowing ring pipe (10), the other end of the dust removal nozzle (11) is connected to the flash reduction tower body (2), and the dust removal ash blowing ring pipe (10) is fixedly connected to the dust removal ash blowing device (9).

5. The flash reduction device integrating coal-based reducing gas and flash reduction according to claim 4, characterized in that: The number of the powder ore nozzles (7) and the dust removal nozzles (11) is 4-8.

6. The flash reduction device integrating coal-based reducing gas and flash reduction according to claim 4, characterized in that: The spraying angles of the powder ore nozzle (7) and the dust removal nozzle (11) are 30-45° downward in the horizontal direction.

7. The flash reduction device integrating coal-based reducing gas and flash reduction according to claim 1, characterized in that: An iron hole (12), a slag hole (13) and a plurality of oxygen-coal guns (14) are arranged on the side wall of the molten pool (3); the plurality of oxygen-coal guns (14) are arranged on the molten pool (3) at equal intervals along the circumferential direction.

8. The flash reduction device integrating coal-based reducing gas and flash reduction according to claim 7, characterized in that: The number of the oxygen-coal guns (14) is 6-8.

9. The flash reduction device integrating coal-based reducing gas and flash reduction according to claim 1, characterized in that: The flash reduction tower body (2) is connected to the cyclone dust collector (5) via a high-temperature flue gas heat exchanger (15).

10. A flash reduction method integrating coal-based reducing gas and flash reduction, applicable to the flash reduction device integrating coal-based reducing gas and flash reduction as claimed in claim 1, characterized in that: The following steps are involved: The reducing gas produced by the coal gasification tower body (1) is transported to the flash reduction tower body (2) through the molten pool (3); The iron ore powder and the solvent are transported to the flash reduction tower body (2) through the iron ore powder injection device (4) and the iron ore powder injection member to react with the reducing gas; The coal gas and dust generated by the flash reduction tower body (2) enter the cyclone dust collector (5) for dust removal; The dust ash produced by the cyclone dust collector (5) is transported to the flash reduction tower body (2) through the circulation part and the dust ash blowing part for secondary reduction and high-temperature melting.

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