Smelting reduction ironmaking system and method based on oxygen enrichment and blast coupling

Abstract

The invention provides a smelting reduction ironmaking system and method based on oxygen enrichment and blast coupling, and belongs to the field of non-blast furnace ironmaking. The system comprises a smelting reduction furnace provided with a high-temperature and high-pressure oxygen-enriched hot air input end; the membrane separation method oxygen generation device is provided with an air input end and a first oxygen-enriched gas output end and is used for converting air into oxygen-enriched gas; and the blower device is provided with a second oxygen-enriched gas input end and a second high-pressure oxygen-enriched gas output end, and the second oxygen-enriched gas input end communicates with the first oxygen-enriched gas output end and is used for pressurizing the oxygen-enriched gas. 35%-40% of oxygen-enriched gas is generated by air through the membrane separation method oxygen generation device, the oxygen-enriched gas is pressurized by the blower device and then fed into the hot blast stove, and the pressurized oxygen-enriched gas is heated by the hot blast stove to be converted into high-temperature and high-pressure oxygen-enriched hot air, so that the carbon emission in the smelting reduction ironmaking process is reduced.

Description

Technical Field

[0001] The present application relates to the technical field of non-blast furnace ironmaking, and in particular to a molten reduction ironmaking system and method based on oxygen enrichment and blast coupling. Background Art

[0002] In traditional technology, a blast furnace uses a total of about 500 kilograms of coke and pulverized coal to smelt each ton of pig iron. Both coke and pulverized coal are fossil energy sources, and their production easily produces a large amount of greenhouse gas carbon emissions, causing serious environmental pollution. As a result, the application of non-blast furnace smelting reduction ironmaking processes with relatively low carbon emissions is becoming more and more widespread.

[0003] However, the non-blast furnace smelting reduction ironmaking process still requires coal powder or coke powder as a reducing agent in actual application. Although the carbon emissions are much reduced compared to the traditional blast furnace ironmaking process, oxygen-enriched blast plays a vital role in metal smelting. It uses a blasting machine to send oxygen-enriched air into the smelting reduction furnace to ensure that the fuel can be fully burned, thereby increasing the furnace temperature. At present, blast furnace ironmaking mainly uses deep cold air separation method and pressure swing adsorption method to produce oxygen to achieve blast furnace oxygen-enriched blast, but the energy consumption of oxygen production is relatively high. Summary of the invention

[0004] The present application provides a smelting reduction ironmaking system and method based on oxygen enrichment and blast coupling to solve the following technical problem: how to systematically reduce the energy consumption of the smelting reduction ironmaking process, thereby reducing carbon emissions during the smelting reduction ironmaking process.

[0005] In a first aspect, an embodiment of the present application provides a smelting reduction ironmaking system based on oxygen enrichment and blast coupling, the system comprising:

[0006] The smelting reduction furnace is provided with a high-temperature, high-pressure, oxygen-rich hot air input terminal;

[0007] A membrane separation oxygen production device is provided with an air input end and a first oxygen-rich gas output end, and is used for converting air into oxygen-rich gas;

[0008] The blowing device is provided with a second oxygen-rich gas input end and a second high-pressure oxygen-rich gas output end. The second oxygen-rich gas input end is connected to the first oxygen-rich gas output end. The blowing device is used to pressurize the oxygen-rich gas.

[0009] Optionally, the system further includes:

[0010] The hot blast furnace is provided with a high-pressure oxygen-rich gas input end and a high-temperature and high-pressure oxygen-rich hot blast output end. The high-pressure oxygen-rich gas input end of the hot blast furnace is connected to the high-pressure oxygen-rich gas output end of the blast device, and the high-temperature and high-pressure oxygen-rich hot blast output end of the hot blast furnace is connected to the air inlet end of the hot blast spray gun.

[0011] Optionally, the system further includes:

[0012] A hot air spray gun is provided, which is used to spray high-temperature, high-pressure, oxygen-rich hot air into the smelting reduction furnace through the hot air spray gun. The high-temperature, high-pressure, oxygen-rich hot air input end of the hot air spray gun is connected to the high-temperature, high-pressure, oxygen-rich hot air output end of the hot air furnace, and the high-temperature, high-pressure, oxygen-rich hot air output end of the hot air spray gun is connected to the air inlet end of the smelting reduction furnace.

[0013] Optionally, the system further includes:

[0014] A mixing gun, through which the preheated iron ore powder and flux are sprayed into the smelting reduction furnace, the mixing gun is connected to the feed end of the smelting reduction furnace.

[0015] Optionally, the system further includes:

[0016] A pulverized coal injection gun, wherein granular coal is injected into the smelting reduction furnace through the pulverized coal injection gun, and the pulverized coal injection gun is connected to the coal inlet end of the smelting reduction furnace.

[0017] Optionally, the system further includes:

[0018] The front furnace is used for high-temperature molten iron to enter the front furnace through the connecting channel at the bottom of the smelting reduction furnace and be discharged by siphoning. The front furnace is connected to the molten iron outlet at the bottom of the smelting reduction furnace;

[0019] A slag outlet, from which the high-temperature slag produced by the smelting reduction furnace is discharged intermittently in batches, and the slag outlet is connected to the slag outlet of the smelting reduction furnace;

[0020] A gas outlet, from which the high-temperature and high-pressure gas generated by the smelting reduction furnace is continuously discharged, and the gas outlet is connected to the gas outlet end of the smelting reduction furnace.

[0021] In a second aspect, the present application provides a smelting reduction ironmaking method based on oxygen enrichment and blast coupling, the method being adapted to the system described in any one of the embodiments of the first aspect, the method comprising:

[0022] Using membrane separation method to convert air into oxygen-rich gas;

[0023] Pressurizing and heating the oxygen-rich gas to obtain high-temperature and high-pressure oxygen-rich hot air;

[0024] The high-temperature, high-pressure, oxygen-enriched hot air and the preheated iron ore powder, flux and granular coal are sprayed into the smelting reduction furnace to carry out a reduction reaction on the iron ore powder in the reduction zone.

[0025] Optionally, the temperature of the high-pressure oxygen-enriched hot air is 1150°C to 1250°C.

[0026] Optionally, the high pressure oxygen-enriched hot air has an O 2 The content is 35% to 45%.

[0027] Optionally, the pressure of the high-pressure oxygen-enriched hot air is 0.08 MPa to 0.25 MPa.

[0028] Compared with the prior art, the above technical solution provided by the embodiment of the present application has the following advantages:

[0029] The embodiment of the present application provides a smelting reduction ironmaking system based on oxygen enrichment and blast coupling, wherein 35% to 40% oxygen-enriched gas is generated by air through a membrane separation oxygen production device, the oxygen-enriched gas is pressurized by a blast device and sent to a hot blast furnace, the pressurized oxygen-enriched gas is heated by the hot blast furnace and converted into high-temperature and high-pressure oxygen-enriched hot air, the high-temperature and high-pressure oxygen-enriched hot air is sprayed into a smelting reduction furnace through a hot air spray gun together with preheated iron ore powder and flux through a mixing gun and granular coal through a coal powder spray gun, the iron ore powder is subjected to a reduction reaction in the reduction zone, and the generated high-temperature molten iron is stored in the bottom furnace of the smelting reduction furnace, the molten iron in the bottom furnace enters the front furnace through the bottom connecting channel of the furnace and is siphoned out, the high-temperature slag is intermittently discharged in batches from the slag mouth, and the high-temperature and high-pressure coal gas is continuously discharged from the coal gas outlet. By adopting a low-cost, low-energy, and environmentally friendly membrane separation method to produce oxygen, the carbon emissions in the smelting reduction ironmaking process are reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] The accompanying drawings herein are incorporated in and constitute a part of the specification, illustrate embodiments consistent with the present application, and together with the description, are used to explain the principles of the present application.

[0031] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0032] Figure 1 A schematic diagram of the structure of a smelting reduction ironmaking system based on oxygen enrichment and blast coupling provided in an embodiment of the present application;

[0033] Figure 2 A schematic flow chart of a smelting reduction ironmaking method based on oxygen enrichment and blast coupling provided in an embodiment of the present application;

[0034] Reference numerals:

[0035] 1- molten reduction furnace, 2- air, 3- membrane separation oxygen production device, 4- blast device, 5- hot blast furnace, 6- hot blast spray gun, 7- mixing material gun, 8- pulverized coal spray gun, 9- front furnace, 10- slag outlet, 11- gas outlet. DETAILED DESCRIPTION

[0036] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described examples are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0037] Various embodiments of the present application may be presented in the form of a range; it should be understood that the description in the form of a range is only for convenience and brevity, and should not be understood as a rigid limitation on the scope of the present application; therefore, the range description should be considered to have specifically disclosed all possible sub-ranges and single numerical values ​​within the range. For example, the range description from 1 to 6 should be considered to have specifically disclosed sub-ranges, such as from 1 to 3, from 1 to 4, from 1 to 5, from 2 to 4, from 2 to 6, from 3 to 6, etc., as well as single numbers within the range, such as 1, 2, 3, 4, 5 and 6, which apply regardless of the range. In addition, whenever a numerical range is indicated herein, it is meant to include any cited number (fractional or integer) within the indicated range.

[0038] In addition, in the description of the specification of the present application, the terms "including", "comprising", etc. mean "including but not limited to". In this article, relational terms such as "first" and "second", etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. In this article, "and / or" describes the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. Wherein A and B can be singular or plural. In this article, "at least one" means one or more, and "plurality" means two or more. "At least one", "the following at least one item (items)" or similar expressions refer to any combination of these items, including any combination of single items (items) or plural items (items). For example, "at least one of a, b, or c", or "at least one of a, b, and c", can all represent: a, b, c, ab (i.e., a and b), ac, bc, or abc, where a, b, c can be single or multiple. "Parts" such as parts by weight and parts by mass indicate the proportional relationship between the components. In the proportional relationship involved in this article, the parameters that need to be described by proportion should be understood as the first term of the proportional formula in the order of description, and the proportional numbers should be understood as the second term of the proportional formula. For example, the mass ratio of substance A, substance B, and substance C is 1:2:3, then substance A, substance B, and substance C should correspond one-to-one with the proportional numbers in the proportional formula in the order of description, that is, the mass of substance A: the mass of substance B: the mass of substance C = 1:2:3.

[0039] Unless otherwise specified, various raw materials, reagents, instruments and equipment used in this application can be purchased from the market or prepared by existing methods.

[0040] Figure 1 A schematic structural diagram of a smelting reduction ironmaking system based on oxygen enrichment and blast coupling provided in an embodiment of the present application.

[0041] like Figure 1 As shown, the present application provides a smelting reduction ironmaking system based on oxygen enrichment and blast coupling, the system comprising:

[0042] The smelting reduction furnace 1 is provided with a high-temperature, high-pressure, oxygen-enriched hot air input terminal;

[0043] The membrane separation oxygen production device 3 is provided with an air 2 input end and a first oxygen-rich gas output end. The first air 2 passes through the membrane separation oxygen production device 3. The membrane separation oxygen production device 3 is used to increase the oxygen content of the air 2 and convert it into oxygen-rich gas;

[0044] The blowing device 4 is provided with a second oxygen-rich gas input end and a second high-pressure oxygen-rich gas output end. The second oxygen-rich gas input end is connected to the first oxygen-rich gas output end. The blowing device 4 is used to pressurize the oxygen-rich gas.

[0045] Membrane separation oxygen production is an application of membrane separation technology and a method of producing oxygen using modern technology. It is a method of producing oxygen by allowing air 2 to pass through a thin film with an oxygen collection function under a certain pressure and separating it through multiple membranes to improve the purity of oxygen. The oxygen concentration produced by this method is not high. In the early days, it was mainly used in oxygen-enriched combustion technology, such as using oxygen-enriched air 2 produced by membrane separation to replace ordinary air 2 for combustion in large boilers, medium-sized industrial boilers, heating boilers, and boilers for ship power units. The advantages of membrane separation in oxygen preparation include: ① Compared with traditional chemical separation methods, membrane separation technology is simple to operate, can realize automated production, and has high reliability; ② Compared with traditional separation technology, membrane separation technology does not use chemical reagents and has low production costs; ③ Since no chemical reagents are used, membrane separation technology does not produce pollutants such as wastewater and waste gas; ④ The oxygen produced in the membrane separation process is hot oxygen-rich gas, and the hot oxygen-rich gas effectively recovers the compression energy of the power equipment, which saves energy and greatly reduces operating costs. The production cost is low and the energy consumption is low; ⑤ The membrane separation method for oxygen production is a purely physical process, without phase change, etc., with good safety and ready for use; ⑥ It occupies a small area and can be expanded modularly.

[0046] At present, blast furnace ironmaking mainly adopts deep cold air separation method and pressure swing adsorption method to achieve oxygen-enriched blast in blast furnace. The oxygen content of oxygen-enriched hot air required for smelting reduction ironmaking is 35% to 40% (volume percentage), which is exactly the oxygen content of the oxygen production product of membrane separation method. The oxygen-enriched gas of membrane separation method can be used in full, and is sent to hot blast furnace 5 for heating and temperature rise after being pressurized by blast device 4. The oxygen-enriched hot air is sprayed into smelting reduction furnace 1 through hot blast spray gun 6. The system reduces the energy consumption of smelting reduction ironmaking process, thereby reducing the carbon emission of smelting reduction ironmaking process.

[0047] In some embodiments, the system further comprises:

[0048] The hot blast furnace 5 is provided with a high-pressure oxygen-rich gas input end and a high-temperature and high-pressure oxygen-rich hot blast output end. The high-pressure oxygen-rich gas input end of the hot blast furnace 5 is connected to the high-pressure oxygen-rich gas output end of the blast device 4, and the high-temperature and high-pressure oxygen-rich hot blast output end of the hot blast furnace 5 is connected to the air inlet end of the hot blast spray gun 6.

[0049] In some embodiments, the system further comprises:

[0050] The hot air spray gun 6 is provided with high-temperature and high-pressure oxygen-rich hot air, which is sprayed into the smelting reduction furnace 1 through the hot air spray gun 6. The high-temperature and high-pressure oxygen-rich hot air input end of the hot air spray gun 6 is connected to the high-temperature and high-pressure oxygen-rich hot air output end of the hot air furnace 5, and the high-temperature and high-pressure oxygen-rich hot air output end of the hot air spray gun 6 is connected to the air inlet end of the smelting reduction furnace 1.

[0051] In some embodiments, the system further comprises:

[0052] A mixing gun 7 , through which the preheated iron ore powder and flux are sprayed into the smelting reduction furnace 1 , is connected to the feed end of the smelting reduction furnace 1 .

[0053] In some embodiments, the system further comprises:

[0054] A pulverized coal injection gun 8 is used to inject granular coal into the smelting reduction furnace 1 . The pulverized coal injection gun 8 is connected to the coal inlet end of the smelting reduction furnace 1 .

[0055] In some embodiments, the system further comprises:

[0056] The front furnace 9, the high-temperature molten iron enters the front furnace 9 through the connecting channel at the bottom of the smelting reduction furnace 1 and is siphoned out, and the front furnace 9 is connected to the molten iron outlet at the bottom of the smelting reduction furnace 1;

[0057] A slag outlet 10, from which the high-temperature slag produced by the smelting reduction furnace 1 is intermittently discharged in batches, and the slag outlet 10 is connected to the slag outlet end of the smelting reduction furnace 1;

[0058] The high-temperature and high-pressure coal gas generated by the smelting reduction furnace 1 is continuously discharged from the coal gas outlet 11 , and the coal gas outlet 11 is connected to the coal gas outlet 11 end of the smelting reduction furnace 1 .

[0059] In the embodiment of the present application, air 2 is passed through a membrane separation oxygen production device 3 to generate 35% to 40% oxygen-enriched gas, the oxygen-enriched gas is pressurized by a blast device 4 and then sent to a hot blast furnace 5, the pressurized oxygen-enriched gas is heated by the hot blast furnace 5 and converted into high-temperature and high-pressure oxygen-enriched hot air, the high-temperature and high-pressure oxygen-enriched hot air is sprayed into a smelting reduction furnace 1 through a hot blast spray gun 6 together with preheated iron ore powder and flux through a mixing gun 7 and granular coal through a coal powder spray gun 8, the iron ore powder is subjected to a reduction reaction in the reduction zone, and the generated high-temperature molten iron is stored in the bottom furnace of the smelting reduction furnace 1, the molten iron in the bottom furnace enters the front furnace 9 through the furnace bottom connecting channel and is siphoned out, the high-temperature slag is intermittently discharged in batches from the slag port 10, and the high-temperature and high-pressure coal gas is continuously discharged from the coal gas outlet 11. By adopting a low-cost, low-energy, and environmentally friendly membrane separation method to produce oxygen, the carbon emissions in the smelting reduction ironmaking process are reduced.

[0060] Figure 2A schematic flow chart of a smelting reduction ironmaking method based on the coupling of oxygen enrichment and blast provided in an embodiment of the present application.

[0061] like Figure 2 As shown, the present application provides a smelting reduction ironmaking method based on oxygen enrichment and blast coupling, the method is adapted to the system described in any one of the above embodiments, and the method includes:

[0062] S1. Use membrane separation to convert air into oxygen-rich gas;

[0063] S2, pressurizing and heating the oxygen-rich gas to obtain high-temperature and high-pressure oxygen-rich hot air;

[0064] S3, spraying the high-temperature and high-pressure oxygen-enriched hot air and the preheated iron ore powder, flux and granular coal into the smelting reduction furnace to perform a reduction reaction on the iron ore powder in the reduction zone.

[0065] In some embodiments, the temperature of the high-pressure oxygen-enriched hot air is 1150°C to 1250°C.

[0066] In some embodiments, the high pressure oxygen-enriched hot air has an O 2 The content is 35% to 45%.

[0067] In some embodiments, the pressure of the high-pressure oxygen-enriched hot air is 0.08 MPa to 0.25 MPa.

[0068] The temperature of the high-temperature, high-pressure, oxygen-rich hot air is limited to between 1150°C and 1250°C, ensuring that there is enough heat energy in the furnace to drive the reduction reaction, while not being too high to cause equipment damage or increase energy consumption. 2 The content is 35% to 45%, which can accelerate the reduction reaction and improve production efficiency. The pressure of the high-pressure oxygen-enriched hot air is limited to 0.08MPa to 0.25MPa, which helps to more effectively deliver the hot air to the smelting reduction furnace 1 while ensuring the stable operation of the equipment. For example, the temperature of the high-pressure oxygen-enriched hot air can be 1150°C, 1170°C, 1190°C, 1200°C, 1230°C, 1250°C, etc. 2 The content can be 35%, 37%, 39%, 40%, 42%, 44%, 45%, etc., and the pressure of the high-pressure oxygen-enriched hot air can be 0.08MPa, 0.10MPa, 0.15MPa, 0.20MPa, 0.22MPa, 0.25MPa, etc.

[0069] In some embodiments, the method further comprises:

[0070] S4, the smelting reduction furnace produces high-temperature molten iron, high-temperature slag and high-temperature and high-pressure coal gas;

[0071] S5, the high-temperature molten iron in the bottom furnace of the smelting reduction furnace enters the front furnace through the connecting channel and is siphoned out;

[0072] S6, discharging the high-temperature slag produced by the smelting reduction furnace intermittently and in batches from the slag outlet;

[0073] S7. The high-temperature and high-pressure coal gas generated by the smelting reduction furnace is continuously discharged from the coal gas outlet.

[0074] In some embodiments, the temperature of the preheated iron ore powder is ≥ 600° C., and the particle size is 0 to 10 mm.

[0075] In some embodiments, the particle size of the solvent is <3 mm.

[0076] In some embodiments, the particle size of the granular coal is <3 mm.

[0077] In some embodiments, the temperature of the high-temperature molten iron in the bottom furnace of the smelting reduction furnace is 1350°C to 1500°C.

[0078] In some embodiments, the temperature of the high-temperature slag produced by the smelting reduction furnace is 1400°C to 1550°C.

[0079] In some embodiments, the high-temperature and high-pressure coal gas generated by the smelting reduction furnace has a temperature of 1400°C to 1600°C, a pressure of 0.08MPa to 0.25MPa, and a dust content of 10 to 20g / Nm 3 .

[0080] In summary, the advantages of the smelting reduction ironmaking system and method based on oxygen enrichment and blast coupling provided in the embodiments of the present application are mainly reflected in the following aspects:

[0081] (1) Low cost and high efficiency: Compared with the traditional cryogenic air separation method and pressure swing adsorption method, the membrane separation method is easy to operate, highly automated and has low production costs. The membrane separation process does not use chemical reagents, which reduces the generation of pollutants such as wastewater and waste gas, and avoids complex processes such as phase change, further reducing energy consumption and production costs.

[0082] (2) Energy saving and environmental protection: The coupling of oxygen-enriched hot air with preheated iron ore powder, flux and granular coal improves the efficiency of the reduction reaction and reduces energy waste. At the same time, by precisely controlling the temperature, oxygen content and pressure of high-temperature and high-pressure oxygen-enriched hot air, the reduction conditions are optimized and carbon emissions are reduced.

[0083] (3) Flexibility and scalability: The membrane separation oxygen production unit can be modularly expanded to easily adapt to the needs of ironmaking of different scales. At the same time, the hot air furnace, hot air spray gun, mixing gun and coal powder spray gun in the system are reasonably designed to facilitate maintenance and upgrades.

[0084] (4) High-quality output: Proper control of the particle size of preheated iron ore powder, flux and granular coal helps to improve the uniformity and efficiency of the reduction reaction. The high-temperature molten iron, high-temperature slag and high-temperature and high-pressure coal gas produced by the smelting reduction furnace are of high quality, providing favorable conditions for subsequent processing.

[0085] (5) Safe and reliable: Oxygen production by membrane separation is a purely physical process that does not involve chemical reactions and is highly safe. At the same time, each component in the system is reasonably designed and operates stably, ensuring the safety of the production process.

[0086] (6) Significant comprehensive benefits: By optimizing each link in the ironmaking process, this method not only improves production efficiency, but also reduces energy consumption and carbon emissions, achieving a dual improvement in economic and environmental benefits.

[0087] The present application will be further described below in conjunction with specific embodiments. It should be understood that these embodiments are intended only to illustrate the present application and are not intended to limit the scope of the present application. The experimental methods for which specific conditions are not specified in the following examples are usually measured according to industry standards. If there is no corresponding industry standard, then the conditions recommended by the manufacturer are followed.

[0088] Example 1

[0089] See also Figure 1 The present embodiment provides a molten reduction ironmaking oxygen-enriched and blast coupled system, the system comprising: air (2) is passed through a membrane separation oxygen production device (3) to generate 35% to 40% oxygen-enriched gas, the oxygen-enriched gas is pressurized by a blast device (4) and then sent to a hot blast furnace (5), the pressurized oxygen-enriched gas is heated by the hot blast furnace (5) and converted into high-temperature and high-pressure oxygen-enriched hot air, the high-temperature and high-pressure oxygen-enriched hot air is sprayed into a molten reduction furnace (1) through a hot air spray gun (6) together with preheated iron ore powder and flux through a mixing gun (7) and granular coal through a coal powder spray gun (8), the iron ore powder is subjected to a reduction reaction in a reduction zone, and the generated high-temperature molten iron is stored in a bottom furnace of the molten reduction furnace (1), the molten iron in the bottom furnace enters a front furnace (9) through a connecting channel at the bottom of the furnace and is discharged in a siphon manner, the high-temperature slag is discharged intermittently and in batches from a slag outlet (10), and the high-temperature and high-pressure coal gas is discharged continuously from a coal gas outlet (11). By adopting low-cost, low-energy, and environmentally friendly membrane separation method to produce oxygen, carbon emissions in the smelting reduction ironmaking process can be reduced.

[0090] The smelting reduction furnace 1 is provided with a high-temperature and high-pressure oxygen-rich hot air input terminal; the membrane separation method oxygen production device 3 is provided with an air 2 input terminal and a first oxygen-rich gas output terminal, the first air 2 passes through the membrane separation method oxygen production device 3, and the membrane separation method oxygen production device 3 is used to convert the air into oxygen-rich gas; the blast device 4 is provided with a second oxygen-rich gas input terminal and a second high-pressure oxygen-rich gas output terminal, the second oxygen-rich gas input terminal is connected to the first oxygen-rich gas output terminal, and the blast device 4 is used to pressurize the oxygen-rich gas; the hot blast furnace 5 is connected between the high-pressure oxygen-rich gas input terminal and the high-temperature and high-pressure oxygen-rich hot air output terminal, and is used to heat the oxygen-rich gas. Oxygen gas; the hot blast spray gun 6 is connected between the hot blast furnace 5 and the air inlet end of the smelting reduction furnace 1; the mixing gun 7, the preheated iron ore powder and flux are sprayed into the smelting reduction furnace 1 through the mixing gun 7; the pulverized coal spray gun 8, the granular coal is sprayed into the smelting reduction furnace 1 through the pulverized coal spray gun 8; the front furnace 9, the high-temperature molten iron in the bottom furnace of the smelting reduction furnace 1 enters the front furnace 9 through the connecting channel at the bottom of the furnace to be siphoned out; the slag outlet 10, the high-temperature slag produced by the smelting reduction furnace 1 is intermittently discharged in batches from the slag outlet 10; the gas outlet 11, the high-temperature and high-pressure gas produced by the smelting reduction furnace 1 is continuously discharged from the gas outlet 11.

[0091] In addition, one or more technical solutions in the embodiments of the present application have at least the following technical effects or advantages:

[0092] In the embodiments of the present application, the provided molten reduction furnace ironmaking oxygen-enriched and blast coupled system can increase the oxygen content of the air and convert it into oxygen-enriched gas, and reduce the operating cost and energy consumption for preparing the oxygen-enriched gas. The membrane separation oxygen production technology does not use chemical reagents and does not produce wastewater, waste gas and other pollutants, thereby achieving the goal of environmental friendliness and reducing carbon emissions.

[0093] In the embodiment of the present application, the oxygen content of the oxygen-enriched hot air required for smelting reduction ironmaking is 35% to 40% (volume percentage), which is exactly the oxygen content of the oxygen production product of the membrane separation method. The membrane separation method oxygen-enriched gas can be used in full, and is sent to the hot blast furnace for heating after being pressurized by the blast device. The oxygen-enriched hot air is sprayed into the smelting reduction furnace through the hot air spray gun. The system reduces the energy consumption of the smelting reduction ironmaking process, thereby reducing the carbon emissions of the smelting reduction ironmaking process.

[0094] The above description is only a specific implementation of the present application, so that those skilled in the art can understand or implement the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest range consistent with the principles and novel features applied for herein.

Claims

1. A smelting reduction ironmaking system based on oxygen enrichment and blast coupling, the system comprising: The smelting reduction furnace (1) is provided with a high-temperature, high-pressure, oxygen-rich hot air input terminal; A membrane separation oxygen production device (3) is provided with an air input end and a first oxygen-rich gas output end, and is used for converting the air (2) into oxygen-rich gas; The blast device (4) is provided with a second oxygen-rich gas input end and a second high-pressure oxygen-rich gas output end, wherein the second oxygen-rich gas input end is connected to the first oxygen-rich gas output end and is used to pressurize the oxygen-rich gas.

2. The system according to claim 1, characterized in that The system further comprises: The hot blast furnace (5) is provided with a high-pressure oxygen-rich gas input end and a high-temperature and high-pressure oxygen-rich hot blast output end. The high-pressure oxygen-rich gas input end of the hot blast furnace (5) is connected to the second high-pressure oxygen-rich gas output end of the blast device (4), and the high-temperature and high-pressure oxygen-rich hot blast output end of the hot blast furnace (5) is connected to the air inlet end of the hot blast spray gun (6).

3. The system according to claim 2, characterized in that The system further comprises: A hot air spray gun (6) is provided, wherein high-temperature, high-pressure, oxygen-rich hot air is sprayed into the smelting reduction furnace (1) through the hot air spray gun (6), the high-temperature, high-pressure, oxygen-rich hot air input end of the hot air spray gun (6) is connected to the high-temperature, high-pressure, oxygen-rich hot air output end of the hot air furnace (5), and the high-temperature, high-pressure, oxygen-rich hot air output end of the hot air spray gun (6) is connected to the air inlet end of the smelting reduction furnace (1).

4. The system according to claim 3, characterized in that The system further comprises: A mixing gun (7) is used to spray the preheated iron ore powder and flux into the smelting reduction furnace (1). The mixing gun (7) is connected to the feed end of the smelting reduction furnace (1).

5. The system according to claim 4, characterized in that The system further comprises: A pulverized coal injection gun (8), through which granular coal is injected into the smelting reduction furnace (1), wherein the pulverized coal injection gun (8) is connected to the coal inlet end of the smelting reduction furnace (1).

6. The system according to claim 1, characterized in that The system further comprises: A front furnace (9), high-temperature molten iron enters the front furnace (9) through a connecting channel at the bottom of the smelting reduction furnace (1) and is discharged in a siphon manner, and the front furnace (9) is connected to the molten iron outlet at the bottom of the smelting reduction furnace (1); A slag outlet (10), from which high-temperature molten slag produced by the smelting reduction furnace (1) is discharged intermittently in batches, and the slag outlet (10) is connected to a slag outlet end of the smelting reduction furnace (1); A coal gas outlet (11), from which the high-temperature and high-pressure coal gas generated by the smelting reduction furnace (1) is continuously discharged, and the coal gas outlet (11) is connected to the coal gas outlet (11) end of the smelting reduction furnace (1).

7. A smelting reduction ironmaking method based on oxygen enrichment and blast coupling, the method being adapted to the system according to any one of claims 1 to 6, the method comprising: Using membrane separation method to convert air into oxygen-rich gas; Pressurizing and heating the oxygen-rich gas to obtain high-temperature and high-pressure oxygen-rich hot air; The high-temperature, high-pressure, oxygen-enriched hot air and the preheated iron ore powder, flux and granular coal are sprayed into the smelting reduction furnace to carry out a reduction reaction on the iron ore powder in the reduction zone.

8. The method according to claim 7, characterized in that The temperature of the high-pressure oxygen-enriched hot air is 1150°C to 1250°C.

9. The method according to claim 7, characterized in that: The O2 content of the high-pressure oxygen-enriched hot air is 35% to 45%.

10. The method according to claim 7, characterized in that The pressure of the high-pressure oxygen-enriched hot air is 0.08MPa to 0.25MPa.

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