CN117107005A - Coal gasification suspension melting ironmaking device and method - Google Patents
Coal gasification suspension melting ironmaking device and method Download PDFInfo
- Publication number
- CN117107005A CN117107005A CN202310815721.7A CN202310815721A CN117107005A CN 117107005 A CN117107005 A CN 117107005A CN 202310815721 A CN202310815721 A CN 202310815721A CN 117107005 A CN117107005 A CN 117107005A
- Authority
- CN
- China
- Prior art keywords
- iron
- coal
- suspension
- smelting
- gas
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 239000003245 coal Substances 0.000 title claims abstract description 134
- 239000000725 suspension Substances 0.000 title claims abstract description 120
- 238000002309 gasification Methods 0.000 title claims abstract description 74
- 238000002844 melting Methods 0.000 title claims abstract description 24
- 230000008018 melting Effects 0.000 title claims abstract description 23
- 238000000034 method Methods 0.000 title claims abstract description 21
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 191
- 239000000843 powder Substances 0.000 claims abstract description 126
- 238000003723 Smelting Methods 0.000 claims abstract description 115
- 229910052742 iron Inorganic materials 0.000 claims abstract description 97
- 239000002994 raw material Substances 0.000 claims abstract description 10
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 9
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 8
- 239000007789 gas Substances 0.000 claims description 76
- 238000006722 reduction reaction Methods 0.000 claims description 49
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 40
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 37
- 239000001301 oxygen Substances 0.000 claims description 37
- 229910052760 oxygen Inorganic materials 0.000 claims description 37
- 229910052500 inorganic mineral Inorganic materials 0.000 claims description 19
- 239000011707 mineral Substances 0.000 claims description 19
- 238000005406 washing Methods 0.000 claims description 19
- 239000002893 slag Substances 0.000 claims description 18
- 239000003034 coal gas Substances 0.000 claims description 16
- 235000008733 Citrus aurantifolia Nutrition 0.000 claims description 15
- 235000011941 Tilia x europaea Nutrition 0.000 claims description 15
- 239000004571 lime Substances 0.000 claims description 15
- 238000007599 discharging Methods 0.000 claims description 13
- 239000000446 fuel Substances 0.000 claims description 13
- 238000003860 storage Methods 0.000 claims description 13
- 238000006243 chemical reaction Methods 0.000 claims description 7
- 239000002817 coal dust Substances 0.000 claims description 7
- 239000012528 membrane Substances 0.000 claims description 7
- 238000009628 steelmaking Methods 0.000 claims description 7
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 6
- 238000010079 rubber tapping Methods 0.000 claims description 5
- 239000012774 insulation material Substances 0.000 claims description 4
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims description 3
- 238000002485 combustion reaction Methods 0.000 claims description 3
- 239000003546 flue gas Substances 0.000 claims description 3
- 239000000203 mixture Substances 0.000 claims description 3
- 229910052757 nitrogen Inorganic materials 0.000 claims description 3
- 238000000926 separation method Methods 0.000 claims description 3
- 238000003786 synthesis reaction Methods 0.000 claims description 3
- 239000004480 active ingredient Substances 0.000 claims description 2
- 238000000746 purification Methods 0.000 claims description 2
- 239000000126 substance Substances 0.000 abstract description 4
- 238000005265 energy consumption Methods 0.000 abstract description 2
- 238000004519 manufacturing process Methods 0.000 abstract description 2
- 238000005272 metallurgy Methods 0.000 abstract description 2
- 238000005516 engineering process Methods 0.000 description 7
- 239000002956 ash Substances 0.000 description 6
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 4
- 239000002245 particle Substances 0.000 description 4
- 229910001608 iron mineral Inorganic materials 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 239000011449 brick Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 239000010883 coal ash Substances 0.000 description 1
- 238000004939 coking Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000004927 fusion Effects 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 238000005245 sintering Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
Abstract
The invention discloses a coal gasification suspension melting ironmaking device and a method, belonging 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 gas purifying unit and a gas supply unit, wherein the upper part of the suspension smelting iron-making furnace is a coal gasification suspension flash reduction section, the lower part of the suspension smelting iron-making furnace is a molten pool smelting section, the gasification of coal and the primary reduction of iron ore powder are realized in the coal gasification suspension flash reduction section, the deep reduction of the iron ore powder is realized by adopting the molten pool smelting section, the product is molten iron and high-quality gas, the coal-iron-melting co-production is realized, the iron-making process flow is simplified, and the energy consumption and the carbon emission of the whole process are reduced.
Description
Technical Field
The invention belongs to the technical field of metallurgy and coal chemical industry, and particularly relates to a coal gasification suspension melting ironmaking device and method.
Background
Patent (CN 112760137A) discloses a multistage entrained-flow bed coal gasifying agent suspension state smelting reduction smelting integrated energy-saving environment-friendly device and method, which adopts a multistage entrained-flow bed coal gasification technology, a gas conversion technology, a suspension state smelting reduction technology and a molten pool smelting technology, and has the defects of complex structure and low effective gas content. Patent (CN 115418428A) discloses a direct smelting reduction furnace, which adopts methane to provide heat and adopts the direct smelting reduction technology of coal dust and iron ore powder, but the natural gas in China is in shortage, and the iron-making cost is high.
Disclosure of Invention
Aiming at the problems of high cost, poor energy utilization and complex device of the existing coal gasification ironmaking process, the invention provides a coal gasification suspension melting ironmaking device and a method, which are high-efficiency fusion integration of coal gasification technology and non-blast furnace ironmaking technology, and provide a novel energy-saving and environment-friendly device and method for coal chemical industry and steel industry.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
a coal gasification suspension melting ironmaking device comprises a raw material conveying unit, a suspension melting ironmaking furnace, a coal gas purifying unit and a gas supply unit;
the raw material conveying unit comprises a coal powder conveying system and a mineral powder conveying system; the pulverized coal conveying system comprises a pulverized coal storage tank and a pulverized coal conveying tank; the lower outlet of the pulverized coal storage tank is connected with the upper inlet of the pulverized coal conveying tank, and the lower outlet of the pulverized coal conveying tank is connected with the nozzle; the mineral powder conveying system comprises: the device comprises an iron ore powder heat exchanger, a lime storage tank and an ore powder conveying tank; the lower outlets of the iron ore powder heat exchanger and the lime storage tank are connected with the upper inlet of the ore powder conveying tank, and the lower outlet of the ore powder conveying tank is divided into two paths which are respectively connected with the nozzle and the ore powder inlet of the suspension smelting furnace;
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 inside of the coal gasification suspension flash reduction section is provided with a membrane water wall and a refractory heat insulation material, the top of the coal gasification suspension flash reduction section is provided with a nozzle, and the middle of the coal gasification suspension flash reduction section is provided with an iron ore powder inlet; the membrane water-cooled wall is connected with the steam drum; the smelting section of the molten pool is provided with a reducing gas inlet, an oxygen inlet, a slag discharging port, a tapping hole and a coal gas outlet; the oxygen inlet is positioned at the lower part of the reducing gas inlet, and the iron outlet is positioned at the lower part of the slag discharging port;
the gas purification unit includes: the device comprises a water washing tower and a separator, wherein circulating water enters from the upper part of the water washing tower, circulating backwater is discharged from the lower part of the water washing tower, an outlet at the upper section of the water washing tower is connected with the separator, reducing gas discharged by the separator returns to a smelting section of a molten pool of the suspension smelting iron-making furnace, and a gas discharge boundary area is used as a chemical synthesis raw material;
the air supply unit includes: steam, oxygen, coal powder conveying gas and mineral powder conveying gas, wherein the steam comes from a steam drum and is divided into two paths, one path enters a nozzle, and the other path is discharged from a boundary region; the oxygen is divided into two paths, one path enters the nozzle, and the other path enters the smelting section of the molten pool; the coal powder conveying gas is nitrogen or air, and the mineral powder conveying gas is air.
Further, the gas from the outlet of the suspension smelting iron-making furnace enters an iron ore powder heat exchanger to exchange heat with the iron ore powder, then enters a water scrubber, and a gas pipeline bypass between the suspension smelting iron-making furnace and the iron ore powder heat exchanger is provided with an induced draft fan.
Further, the weight ratio of the iron ore powder to the coal powder is 1.0-2.0.
Further, the ratio of oxygen to pulverized coal is 0.4 to 1.0Nm 3 /kg。
Further, the weight ratio of the steam entering the suspension smelting ironmaking furnace to the coal powder is 0-0.1.
A coal gasification suspension smelting iron making method, comprising the following steps:
step 1, starting an induced draft fan, introducing fuel and oxygen into a burner, introducing the fuel and the oxygen into a coal gasification suspension flash reduction section and a molten pool smelting section, starting an igniter, and baking;
step 2, stopping induced draft fans when the temperatures of the coal gasification suspension flash reduction section and the molten pool smelting section reach above 600 ℃; starting a water circulation system of the water washing tower, introducing the flue gas into the water washing tower, and continuing to bake the furnace;
step 3, stopping the furnace fuel of the coal gasification suspension flash reduction section and the molten pool smelting section when the temperature of the coal gasification suspension flash reduction section reaches more than 1000 ℃, feeding coal powder into a nozzle through a coal powder conveying tank, feeding steam into a suspension smelting iron-making furnace through the nozzle, and feeding a reducing gas nozzle into a nozzle of the molten pool smelting section;
step 4, the temperatures of the coal gasification suspension flash reduction section and the molten pool smelting section reach above 1400 ℃, iron ore powder and lime are sent into a suspension smelting iron-making furnace through a mineral powder conveying tank, coal powder and oxygen undergo gasification reaction in the coal gasification suspension flash reduction section to generate coal gas rich in CO, and CO and iron ore powder undergo reduction reaction to reduce most of the iron ore powder into iron;
step 5, allowing unreduced iron ore powder and unreacted carbon to enter a smelting section of a molten pool, enabling reducing gas and oxygen to undergo a combustion reaction to provide heat, enabling the unreduced carbon and the unreduced iron ore powder to undergo a reduction reaction, and completely converting the iron ore powder into iron;
step 6, the slag-iron separation is realized in the smelting section of the molten pool, ash residues are discharged from a slag discharge port to a boundary zone, and molten iron is discharged from a tap hole to be sent to steelmaking;
step 7, the gas at the outlet of the suspension smelting iron-making furnace sequentially passes through an iron ore powder heat exchanger, a water scrubber and a separator, and the separated reducing gas enters the suspension smelting iron-making furnace and is discharged out of the boundary region;
further, the reaction temperature of the suspension smelting iron-making furnace is 1400-1600 ℃.
Further, reducing gas/iron ore powder=0.05 to 0.15Nm 3 Per kg, reducing gas composition comprising CO and H 2 。
Further, the effective components CO and H in the coal gas 2 Is greater than 60%.
Compared with the prior art, the invention has the following advantages:
1) Deep reduction of iron ore powder is realized by utilizing gasified carbon residue, the melting point of coal ash is reduced by utilizing the iron ore powder, and the energy utilization efficiency is improved;
2) The coking and sintering units of the traditional blast furnace are eliminated, and the process energy consumption is reduced.
3) Realize the coal-iron-chemical co-production, simplify the iron-making process flow, reduce the product cost and reduce the carbon emission.
Drawings
FIG. 1 is a schematic diagram of a coal gasification suspension melting ironmaking device.
Reference numerals: 1. coal dust; 2. iron ore powder; 3. lime; 4. a pulverized coal storage tank; 5. an iron ore powder heat exchanger; 6. a lime storage tank; 7. a pulverized coal conveying tank; 8. a mineral powder conveying tank; 9. oxygen; 10. a suspension melting iron-making furnace; 10-1, a coal gasification suspension flash reduction section; 10-2, smelting a molten pool smelting section; 10-3, a nozzle; 10-4, membrane water wall; 10-5, refractory insulation material; 10-6, refractory bricks; 10-7, an oxygen inlet; 10-8, a gas outlet; 10-9, a reducing gas inlet; 10-10, a slag discharging port; 10-11, a tap hole; 10-12 mineral powder inlets; 11. ash residues; 12. molten iron; 13. a steam drum; 14. water vapor; 15. a water washing tower; 16. a separator; 17. gas; 18. reducing gas; 19. suspension smelting iron-making furnace outlet gas; 20. pulverized coal conveying gas; 21. mineral powder conveying gas; 22. circulating water; 23. circulating water; 24. and (5) a draught fan.
Detailed Description
The present invention is further illustrated by, but not limited to, the following examples.
As shown in fig. 1, a coal gasification suspension smelting iron making device comprises a raw material conveying unit, a suspension smelting iron making furnace, a coal gas purifying unit and a gas supply unit;
the upper part of the suspension smelting iron-making furnace 10 is a coal gasification suspension flash reduction section 10-1, and the lower part is a molten pool smelting section 10-2.
The coal gasification suspension smelting ironmaking device is characterized in that a coal gasification suspension flash reduction section 10-1 is cylindrical, a membrane water-cooled wall 10-4 and a refractory heat insulation material 10-5 are arranged in the coal gasification suspension flash reduction section, the membrane water-cooled wall 10-4 is connected with a steam drum 13, a nozzle 10-3 is arranged at the top, and an iron ore powder inlet 10-12 is arranged in the middle; the smelting section 10-2 of the molten pool is cylindrical and is provided with a reducing gas inlet 10-9, an oxygen inlet 10-7, a slag discharging port 10-10, a tapping hole 10-11 and a coal gas outlet 10-8, wherein the oxygen inlet 10-7 is positioned at the lower part of the reducing gas inlet 10-9, and the tapping hole 10-11 is positioned at the lower part of the slag discharging port 10-10.
The coal gasification suspension melting ironmaking device comprises a raw material conveying unit, a coal powder conveying unit and a coal powder conveying unit, wherein the lower outlet of a coal powder storage tank 4 of the coal powder conveying unit is connected with the upper inlet of a coal powder conveying tank 7, and the lower outlet of the coal powder conveying tank 7 is connected with a nozzle 10-3.
The coal gasification suspension melting ironmaking device is characterized in that the mineral powder conveying system comprises an iron mineral powder heat exchanger 5, a lime storage tank 6 and a mineral powder conveying tank 8, wherein the lower outlets of the iron mineral powder heat exchanger 5 and the lime storage tank 6 are connected with the upper inlet of the mineral powder conveying tank 8, and the lower outlet of the mineral powder conveying tank 8 is divided into two paths which are respectively connected with a nozzle 10-3 and a mineral powder inlet 10-12 of the suspension melting smelting furnace 10.
In the coal gasification suspension smelting iron-making device, coal gas 19 from the outlet of the suspension smelting iron-making furnace enters the iron ore powder heat exchanger 5 to exchange heat with the iron ore powder 2, then enters the water scrubber 15, and a draught fan 24 is arranged by-pass of a coal gas pipeline between the suspension smelting iron-making furnace 10 and the iron ore powder heat exchanger 5.
The coal gasification suspension melting ironmaking device comprises a coal gas purifying unit and a gas purifying unit, wherein the coal gas purifying unit comprises a water washing tower 15 and a separator 16, circulating water 22 enters from the upper part of the water washing tower 15, circulating water return 23 is discharged from the lower part of the water washing tower 15, an outlet at the upper section of the water washing tower 15 is connected with the separator 16, reducing gas 18 discharged by the separator 16 enters into a melting bath smelting section 10-2 of the suspension melting ironmaking furnace, and a discharge boundary region of coal gas 17 is used as a chemical synthesis raw material.
The gas supply unit comprises water vapor 14, oxygen 9, pulverized coal conveying gas 20 and mineral powder conveying gas 21, wherein the water vapor 14 is from a steam drum 13 and is divided into two paths, one path enters a nozzle 10-3, and the other path is discharged out of a boundary region; the oxygen 9 is divided into two paths, one path enters the nozzle 10-3, and the other path enters the smelting section 10-2 of the molten pool; the pulverized coal feed gas 20 is nitrogen or air, and the pulverized coal feed gas 21 is air.
The coal gasification suspension smelting ironmaking device has the weight ratio of iron ore powder 2 to coal powder 1 of 1.0-2.0, and the ratio of oxygen 9 to coal powder 1 of 0.4-1.0Nm 3 The weight ratio of steam entering the suspension smelting ironmaking furnace to the coal dust 1 is 0-0.1.
A coal gasification suspension smelting iron making method comprising the steps of:
step 1, a draught fan 24 is started, fuel and oxygen 9 are led into a burner 10-3, the fuel and the oxygen 9 are led into a coal gasification suspension flash reduction section 10-1 and a molten pool smelting section 10-2, and an igniter is started to perform baking.
And 2, stopping the induced draft fan 24 when the temperature of the coal gasification suspension flash reduction section 10-1 and the molten pool smelting section 10-2 reaches more than 600 ℃. Starting a water circulation system of the water washing tower 15, introducing the flue gas into the water washing tower 15, and continuing to bake the furnace.
Step 3, the temperature of the coal gasification suspension flash reduction section 10-1 reaches more than 1000 ℃, furnace fuel of the coal gasification suspension flash reduction section 10-1 and the molten pool smelting section 10-2 is stopped, coal powder 1 is sent into a nozzle 10-3 through a coal powder conveying tank 7, steam 14 is sent into a suspension smelting iron-making furnace 10 through the nozzle 10-3, and a reducing gas nozzle 18 is sent into the nozzle 10-2 of the molten pool smelting section.
And 4, the temperatures of the coal gasification suspension flash reduction section 10-1 and the molten pool smelting section 10-2 reach more than 1400 ℃, iron ore powder 2 and lime 3 are fed into the suspension smelting iron-making furnace 10 through the ore powder conveying tank 8, the coal powder 1 and oxygen 9 undergo gasification reaction in the coal gasification suspension flash reduction section 10-1 to generate coal gas rich in CO, the CO undergoes reduction reaction with the iron ore powder 2, and most of the iron ore powder 2 is reduced into iron.
And 5, allowing the unreduced iron ore powder 2 and unreacted carbon to enter a molten pool smelting section 10-2, allowing a combustion reaction between the reducing gas 18 and oxygen 9 to provide heat, allowing the unreacted carbon and the unreduced iron ore powder 2 to undergo a reduction reaction, and completely converting the iron ore powder 2 into iron.
And 6, realizing slag-iron separation in the smelting section 10-2 of the molten pool, discharging slag 11 from a slag discharge port 10-10 to a boundary region, and discharging molten iron 12 from a tap hole 10-11 to steel making.
Step 7, the outlet gas 19 of the suspension smelting iron-making furnace sequentially passes through the iron ore powder heat exchanger 5, the water scrubber 15 and the separator 16, the separated reducing gas 18 enters the suspension smelting iron-making furnace 10, and the gas 17 is discharged out of the boundary region.
In the coal gasification suspension smelting iron-making method, the reaction temperature of the suspension smelting iron-making furnace 10 is 1400-1600 ℃, and the ratio of the reducing gas to the iron ore powder 1 is 0.05-0.15Nm 3 Per kg, the reducing gas 18 composition comprises CO and H 2 . Active ingredient CO+H in coal gas 17 2 Greater than 60%.
The coal gasification suspension smelting iron making method is described in detail below through specific implementation processes.
Example 1:
coal gasification suspension flash reduction section 10-1 temperatureWhen the temperature reaches 1000 ℃, stopping the furnace baking fuel of the suspension melting iron-making furnace 10, feeding the pulverized coal 1, oxygen 9 and steam 14 with the particle size of 150 meshes into the nozzle 10-3, controlling the temperature of the coal gasification suspension flash reduction section 10-1 to be 1600 ℃, and feeding the reducing gas 18 into the nozzle 10-2 of the melting pool smelting section. The temperature of the smelting section 10-2 of the molten pool reaches 1400 ℃, iron ore powder 2 and lime 3 are fed into a nozzle 10-3, the temperature of the smelting section is controlled to 1600 ℃, ash 11 is discharged from a slag discharging port 10-10 to a boundary area, and molten iron 12 is discharged from a tap hole 10-11 to be fed into steelmaking. The weight ratio of the iron ore powder 2 to the pulverized coal 1 was 1.8, and the weight ratio of the oxygen 9 to the pulverized coal 1 was 0.9Nm 3 The weight ratio of steam entering the suspension smelting ironmaking furnace to the coal dust 1 is 0.07. The ratio of the reducing gas to the iron ore powder 1 was 0.1Nm 3 /kg, effective component CO+H in gas 17 2 68%.
Example 2:
the temperature of the coal gasification suspension flash reduction section 10-1 reaches 1100 ℃, the furnace fuel of the suspension smelting iron-making furnace 10 is stopped, the coal powder 1 with the particle size of 150 meshes, oxygen 9 and steam 14 are fed into the nozzle 10-3, the temperature of the coal gasification suspension flash reduction section 10-1 is controlled to 1600 ℃, and the reducing gas 18 is fed into the nozzle 10-2 of the molten pool smelting section. The temperature of the smelting section 10-2 of the molten pool reaches 1450 ℃, iron ore powder 2 and lime 3 are fed into the suspension smelting iron-making furnace 10 through the ore powder inlet 10-12, the temperature of the smelting section is controlled to 1600 ℃, ash slag 11 is discharged from the slag discharge port 10-10 to the boundary area, and molten iron 12 is discharged from the iron discharge port 10-11 to steel making. The weight ratio of the iron ore powder 2 to the coal powder 1 is 1.4, the weight ratio of the oxygen 9 to the coal powder 1 is 0.9Nm3/kg, and the weight ratio of the steam entering the suspension smelting ironmaking furnace to the coal powder 1 is 0.05. The ratio of the reducing gas to the iron ore powder 1 was 0.15Nm 3 /kg, effective component CO+H in gas 17 2 65%.
Example 3:
the temperature of the coal gasification suspension flash reduction section 10-1 reaches 1050 ℃, the furnace fuel of the suspension smelting iron-making furnace 10 is stopped, the coal powder 1 with the particle size of 200 meshes, oxygen 9 and steam 14 are fed into the nozzle 10-3, the temperature of the coal gasification suspension flash reduction section 10-1 is controlled to 1550 ℃, and the reducing gas 18 is fed into the nozzle 10-2 of the molten pool smelting section. The temperature of a smelting section 10-2 of a molten pool reaches 1500 ℃, and iron ore powder 2 and lime 3 are sent through an ore powder inlet 10-12The slag is fed into a suspension smelting iron-making furnace 10, the temperature of a smelting section is controlled to be 1600 ℃, ash slag 11 is discharged from a slag discharging port 10-10 to a boundary region, and molten iron 12 is discharged from a tapping port 10-11 to be sent to steelmaking. The weight ratio of the iron ore powder 2 to the pulverized coal 1 was 1.6, and the weight ratio of the oxygen 9 to the pulverized coal 1 was 0.7Nm 3 The weight ratio of steam entering the suspension smelting ironmaking furnace to the coal dust 1 is 0.1. The ratio of the reducing gas to the iron ore powder 1 was 0.05Nm 3 /kg, effective component CO+H in gas 17 2 63%.
Example 4:
the temperature of the coal gasification suspension flash reduction section 10-1 reaches 1100 ℃, the furnace fuel of the suspension smelting iron-making furnace 10 is stopped, the coal powder 1 with the particle size of 200 meshes, oxygen 9 and steam 14 are fed into the nozzle 10-3, the temperature of the coal gasification suspension flash reduction section 10-1 is controlled to be 1400 ℃, and the reducing gas 18 is fed into the nozzle 10-2 of the molten pool smelting section. The temperature of the smelting section 10-2 of the molten pool reaches 1450 ℃, iron ore powder 2 and lime 3 are fed into the nozzle 10-3, the temperature of the smelting section is controlled to 1550 ℃, ash 11 is discharged from the slag discharging port 10-10 to the boundary area, and molten iron 12 is discharged from the iron discharging port 10-11 to be fed into steelmaking. The weight ratio of the iron ore powder 2 to the pulverized coal 1 was 1.0, and the weight ratio of the oxygen 9 to the pulverized coal 1 was 0.6Nm 3 The weight ratio of steam entering the suspension smelting ironmaking furnace to the coal dust 1 is 0.1. The ratio of the reducing gas to the iron ore powder 1 was 0.08Nm 3 /kg, effective component CO+H in gas 17 2 70%.
What is not described in detail in the present specification belongs to the prior art known to those skilled in the art. While the foregoing describes illustrative embodiments of the present invention to facilitate an understanding of the present invention by those skilled in the art, it should be understood that the present invention is not limited to the scope of the embodiments, but is to be construed as protected by the accompanying claims insofar as various changes are within the spirit and scope of the present invention as defined and defined by the appended claims.
Claims (9)
1. A coal gasification suspension melting ironmaking device is characterized in that: comprises a raw material conveying unit, a suspension melting iron-smelting furnace, a gas purifying unit and a gas supply unit;
the raw material conveying unit comprises a coal powder conveying system and a mineral powder conveying system; the pulverized coal conveying system comprises a pulverized coal storage tank and a pulverized coal conveying tank; the lower outlet of the pulverized coal storage tank is connected with the upper inlet of the pulverized coal conveying tank, and the lower outlet of the pulverized coal conveying tank is connected with the nozzle; the mineral powder conveying system comprises: the device comprises an iron ore powder heat exchanger, a lime storage tank and an ore powder conveying tank; the lower outlets of the iron ore powder heat exchanger and the lime storage tank are connected with the upper inlet of the ore powder conveying tank, and the lower outlet of the ore powder conveying tank is divided into two paths which are respectively connected with the nozzle and the ore powder inlet of the suspension smelting furnace;
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 inside of the coal gasification suspension flash reduction section is provided with a membrane water wall and a refractory heat insulation material, the top of the coal gasification suspension flash reduction section is provided with a nozzle, and the middle of the coal gasification suspension flash reduction section is provided with an iron ore powder inlet; the membrane water-cooled wall is connected with the steam drum; the smelting section of the molten pool is provided with a reducing gas inlet, an oxygen inlet, a slag discharging port, a tapping hole and a coal gas outlet; the oxygen inlet is positioned at the lower part of the reducing gas inlet, and the iron outlet is positioned at the lower part of the slag discharging port;
the gas purification unit includes: the device comprises a water washing tower and a separator, wherein circulating water enters from the upper part of the water washing tower, circulating backwater is discharged from the lower part of the water washing tower, an outlet at the upper section of the water washing tower is connected with the separator, reducing gas discharged by the separator returns to a smelting section of a molten pool of the suspension smelting iron-making furnace, and a gas discharge boundary area is used as a chemical synthesis raw material;
the air supply unit includes: steam, oxygen, coal powder conveying gas and mineral powder conveying gas, wherein the steam comes from a steam drum and is divided into two paths, one path enters a nozzle, and the other path is discharged from a boundary region; the oxygen is divided into two paths, one path enters the nozzle, and the other path enters the smelting section of the molten pool; the coal powder conveying gas is nitrogen or air, and the mineral powder conveying gas is air.
2. The coal gasification suspension smelting iron making apparatus according to claim 1, wherein: the gas from the outlet of the suspension smelting iron-making furnace enters an iron ore powder heat exchanger to exchange heat with the iron ore powder, then enters a water scrubber, and a gas pipeline bypass between the suspension smelting iron-making furnace and the iron ore powder heat exchanger is provided with an induced draft fan.
3. The coal gasification suspension smelting iron making apparatus according to claim 1, wherein: the weight ratio of the iron ore powder to the coal powder is 1.0-2.0.
4. The coal gasification suspension smelting iron making apparatus according to claim 1, wherein: the ratio of oxygen to pulverized coal is 0.4-1.0Nm 3 /kg。
5. The coal gasification suspension smelting iron making apparatus according to claim 1, wherein: the weight ratio of the steam entering the suspension smelting ironmaking furnace to the coal dust is 0-0.1.
6. A method of coal gasification suspension smelting iron making in accordance with any one of claims 1 to 5 comprising the steps of:
step 1, starting an induced draft fan, introducing fuel and oxygen into a burner, introducing the fuel and the oxygen into a coal gasification suspension flash reduction section and a molten pool smelting section, starting an igniter, and baking;
step 2, stopping induced draft fans when the temperatures of the coal gasification suspension flash reduction section and the molten pool smelting section reach above 600 ℃; starting a water circulation system of the water washing tower, introducing the flue gas into the water washing tower, and continuing to bake the furnace;
step 3, stopping the furnace fuel of the coal gasification suspension flash reduction section and the molten pool smelting section when the temperature of the coal gasification suspension flash reduction section reaches more than 1000 ℃, feeding coal powder into a nozzle through a coal powder conveying tank, feeding steam into a suspension smelting iron-making furnace through the nozzle, and feeding a reducing gas nozzle into a nozzle of the molten pool smelting section;
step 4, the temperatures of the coal gasification suspension flash reduction section and the molten pool smelting section reach above 1400 ℃, iron ore powder and lime are sent into a suspension smelting iron-making furnace through a mineral powder conveying tank, coal powder and oxygen undergo gasification reaction in the coal gasification suspension flash reduction section to generate coal gas rich in CO, and CO and iron ore powder undergo reduction reaction to reduce most of the iron ore powder into iron;
step 5, allowing unreduced iron ore powder and unreacted carbon to enter a smelting section of a molten pool, enabling reducing gas and oxygen to undergo a combustion reaction to provide heat, enabling the unreduced carbon and the unreduced iron ore powder to undergo a reduction reaction, and completely converting the iron ore powder into iron;
step 6, the slag-iron separation is realized in the smelting section of the molten pool, ash residues are discharged from a slag discharge port to a boundary zone, and molten iron is discharged from a tap hole to be sent to steelmaking;
and 7, enabling the gas at the outlet of the suspension melting iron-making furnace to sequentially pass through an iron ore powder heat exchanger, a water scrubber and a separator, and enabling the separated reducing gas to enter the suspension melting iron-making furnace and the gas to be discharged out of the boundary region.
7. The coal gasification suspension smelting iron making method according to claim 6, wherein: the reaction temperature of the suspension melting iron-making furnace is 1400-1600 ℃.
8. The coal gasification suspension smelting iron making method according to claim 6, wherein: reducing gas/iron ore powder=0.05 to 0.15Nm 3 Per kg, reducing gas composition comprising CO and H 2 。
9. The coal gasification suspension smelting iron making method according to claim 6, wherein: active ingredients CO and H in coal gas 2 Is greater than 60%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310815721.7A CN117107005A (en) | 2023-07-04 | 2023-07-04 | Coal gasification suspension melting ironmaking device and method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310815721.7A CN117107005A (en) | 2023-07-04 | 2023-07-04 | Coal gasification suspension melting ironmaking device and method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117107005A true CN117107005A (en) | 2023-11-24 |
Family
ID=88802789
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310815721.7A Pending CN117107005A (en) | 2023-07-04 | 2023-07-04 | Coal gasification suspension melting ironmaking device and method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117107005A (en) |
-
2023
- 2023-07-04 CN CN202310815721.7A patent/CN117107005A/en active Pending
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| AU2009272944B2 (en) | Method and system for energy-optimized and CO2 emission-optimized iron production | |
| Kurunov | The direct production of iron and alternatives to the blast furnace in iron metallurgy for the 21st century | |
| WO2021035815A1 (en) | Electric energy full-hydrogen flash reduction direct steelmaking system and process | |
| CN1219857C (en) | Solid slag-discharing dry-powder air-current bed gasification process and apparatus | |
| CN102010924B (en) | Method for producing directly reduced iron from coal | |
| CA2665770C (en) | Method and device for producing molten material | |
| CN101413038B (en) | Coal powder pure oxygen blast furnace ironmaking process and equipment thereof | |
| CN103451344B (en) | CEO compound smelting reduction ironmaking plant and technology | |
| CN101603104A (en) | CO in blast furnace and the coal gas of converter 2Separation and Recovery and cyclic utilization method | |
| CN100451133C (en) | Method and apparatus for producing directly reduced iron with coke oven gas | |
| CN1031000C (en) | Oxygen coal powder flux tuyere composite blowing blast furnace iron-smelting technology | |
| CN114686633A (en) | Method for pre-heat exchanging hydrogen by utilizing direct reduction iron furnace top gas | |
| CN114672602A (en) | Method for smelting schreyerite by coke oven gas-based shaft furnace and carrying out electric furnace melting, separating and deep reduction | |
| RU2263714C2 (en) | Method and apparatus for producing of cast iron or liquid steel products from iron-ore containing burden | |
| CN220503099U (en) | Coal gasification suspension melting ironmaking device | |
| CN201433222Y (en) | Internally-externally-heating sponge iron reduction device | |
| CN2433260Y (en) | Multi-stage fluidized moving bed melting station reducing ironmaking furnace | |
| CN117107005A (en) | Coal gasification suspension melting ironmaking device and method | |
| KR20100082696A (en) | Process for making iron in a blast furnace and use of top gas resulting from said process | |
| US10851430B2 (en) | Flash ironmaking system and method | |
| CN210131527U (en) | Electronic waste smelting device and electronic waste and waste gas treatment system formed by same | |
| CN101603103A (en) | Pure reduction blast furnace iron making method | |
| CN109517934B (en) | Method for smelting pure metal by accurately controlling heat loss value | |
| RU2319749C2 (en) | Method of the direct production of iron, in particular steels, and installation for its implementation | |
| CN216712010U (en) | Coal gasifier and system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |