A carbon cycle blast furnace high-efficiency ironmaking system and method

Abstract

The present invention provides an ironmaking system for efficient smelting in a carbon cycle blast furnace, comprising a sintering system, a first screening system adjacent to the sintering system, a first blast furnace system and a second blast furnace system connected to the first screening system. The first screening system screens the sintered ore into large-particle sintered ore, medium-particle sintered ore and small-particle sintered ore, and the small-particle sintered ore returns to the sintering system; the large-particle sintered ore enters the first blast furnace system and the second blast furnace system, and the medium-particle sintered ore enters the second blast furnace system. An ironmaking method is also provided, comprising sintering through a sintering system to obtain sintered ore, and screening the sintered ore according to particle size to obtain large-particle sintered ore, medium-particle sintered ore and small-particle sintered ore. The technical solution of the present invention can greatly reduce the amount of returned ore in the sintering process, and can also maintain the air permeability and smelting effect of a traditional blast furnace.

Description

Technical Field

[0001] The present invention relates to the technical field of blast furnace ironmaking, and in particular to an ironmaking system and method for high-efficiency smelting in a carbon cycle blast furnace. Background Art

[0002] The energy consumption of sintering and blast furnace processes accounts for about 55% of the energy consumption of steel production processes, and is a major energy consumer in the steel industry. Therefore, sintering and blast furnace processes should shoulder the responsibility of energy conservation and consumption reduction in the steel industry. At present, there is room for further optimization of the material flow and energy flow of sintering and blast furnace processes.

[0003] The uniformity of the sintered ore particle size has a great influence on the coking output of the blast furnace process. The sintering-blast furnace process is to transport the return ore under the trough and the sintering return ore as high return and self-return respectively to the sintering process for sintering. The traditional blast furnace requires that the particle size of the ore entering the furnace should preferably be large-particle sintered ore of more than 5mm, so that the air permeability and smelting effect of the blast furnace are better, but the particle size of the sintered ore is difficult to control. In order to absolutely maintain the particle size requirements of the blast furnace, the sintered ore with a particle size less than 5mm will not be able to enter the blast furnace, but will be returned to the sintering process as return ore. Excessive return ore will affect the sintering process, resulting in worse quality of the sintered ore, causing a vicious cycle of sintering production, and at the same time increase sintering energy consumption, increase sintering flue gas emissions and SO 2 , NOX, dioxins and other harmful substances. Summary of the invention

[0004] 1. Technical Problems Solved

[0005] In view of the deficiencies in the prior art, the present invention provides an ironmaking system and method for efficient smelting in a carbon cycle blast furnace, which solves the problem in the prior art of how to reduce the amount of ore returned in the sintering process and ensure the effect of blast furnace smelting.

[0006] 2. Technical Solution

[0007] To achieve the above object, the present invention provides the following technical solutions:

[0008] In a first aspect, a carbon cycle blast furnace high-efficiency ironmaking system is provided, characterized in that it comprises:

[0009] Sintering system, used for sintering to obtain sintered ore;

[0010] A first screening system, connected to the sintering system,

[0011] a first blast furnace system connected to the first screening system, wherein the first blast furnace system comprises a conventional blast furnace,

[0012] a second blast furnace system connected to the first screening system, the second blast furnace system comprising an oxygen blast furnace;

[0013] The first screening system screens the sintered ore into large-particle sintered ore, medium-particle sintered ore and small-particle sintered ore, and the small-particle sintered ore is returned to the sintering system; the large-particle sintered ore enters the first blast furnace system and the second blast furnace system, and the medium-particle sintered ore enters the second blast furnace system.

[0014] In combination with the first aspect, in one embodiment, the first screening system includes:

[0015] A first screening device is connected to the sintering system, the screened material of the first screening device is the large-size sintered ore, and the screened material of the first screening device is the return ore mixed with the medium-size sintered ore and the small-size sintered ore;

[0016] The second screening device is connected to the first screening device and separates the returned ore into medium-sized sintered ore and small-sized sintered ore.

[0017] In combination with the first aspect, in one embodiment, the first blast furnace system further includes:

[0018] a first silo, connected to the first screening device, for collecting the large-size sintered ore;

[0019] A third screening device is connected to the first silo, the screened material of the third screening device is large-size sintered ore and leads to the conventional blast furnace, and the screened material of the third screening device is return ore mixed with medium-size sintered ore and small-size sintered ore;

[0020] The fourth screening device is connected to the third screening device, and separates the returned ore into medium-sized sintered ore and small-sized sintered ore. The medium-sized sintered ore is led to the second blast furnace system, and the small-sized sintered ore is returned to the sintering system.

[0021] In combination with the first aspect, in one embodiment, the second blast furnace system further includes:

[0022] A second silo, connected to the first screening device, for collecting the large-size sintered ore;

[0023] a fifth screening device connected to the second silo, wherein the screened material of the fifth screening device is large-particle sintered ore and is led to the oxygen blast furnace, and the screened material of the fifth screening device is return ore mixed with medium-particle sintered ore and small-particle sintered ore;

[0024] a sixth screening device, connected to the fifth screening device, for separating the returned ore into medium-sized sintered ore and small-sized sintered ore, wherein the small-sized sintered ore is returned to the sintering system;

[0025] The particle silo is connected to the second screening device, the fourth screening device and the sixth screening device and is used to collect the medium-sized sintered ore separated by the corresponding devices.

[0026] In combination with the first aspect, in one embodiment, the sintering system includes a sintering raw material bin and a sintering machine connected in sequence, and the sintering raw material bin is also connected to the second screening device, the fourth screening device and the sixth screening device and is used to collect small-particle sintered ore separated by the corresponding devices.

[0027] In combination with the first aspect, in one embodiment, the first blast furnace system and the second blast furnace system each further include at least two blast furnace charge bins, each of the blast furnace charge bins being connected to a corresponding coarse screening device, the above-screen discharge of the coarse screening device of the first blast furnace system being connected to a conventional blast furnace, and the below-screen discharge being connected to a fourth screening device; the above-screen discharge of the coarse screening device of the second blast furnace system being connected to an oxygen blast furnace, and the below-screen discharge being connected to a sixth screening device.

[0028] In combination with the first aspect, in one embodiment, the mesh size of the vibrating screen of the first screening device, the third screening device and the fifth screening device is 5 mm, and the mesh size of the vibrating screen of the second screening device, the fourth screening device and the sixth screening device is 1 mm.

[0029] In a second aspect, a carbon cycle blast furnace efficient ironmaking method is also provided, the key of which is to include the following steps:

[0030] Sintered ore is obtained by sintering in a sintering system.

[0031] Screening the sintered ore according to the particle size to obtain large-size sintered ore, medium-size sintered ore and small-size sintered ore;

[0032] The large-particle-size sintered ore enters an oxygen blast furnace and a conventional blast furnace for smelting, the medium-particle-size sintered ore enters an oxygen blast furnace for smelting, and the small-particle-size sintered ore returns to the sintering system for sintering again.

[0033] In combination with the second aspect, in one embodiment, the particle size of the large-size sintered ore is greater than 5 mm, the particle size of the medium-size sintered ore is 1 to 5 mm, and the particle size of the small-size sintered ore is less than 1 mm.

[0034] In combination with the second aspect, in one embodiment, the large-particle-size sintered ore is screened again before being transported into the oxygen blast furnace and the traditional blast furnace, respectively, to separate the medium-particle-size sintered ore and the small-particle-size sintered ore produced during the transportation of the large-particle-size sintered ore. The medium-particle-size sintered ore and the small-particle-size sintered ore are further separated and enter the oxygen blast furnace and the sintering system, respectively.

[0035] 3. Beneficial Effects

[0036] The beneficial effects brought about by the technical solution in the present invention include at least: based on the sintering process and the traditional blast furnace, the oxygen blast furnace is cleverly introduced. Compared with the traditional blast furnace, the oxygen blast furnace can accept sintered ore with smaller particle size. Therefore, the medium-sized sintered ore between the large-sized sintered ore and the small-sized sintered ore can be used as the ore fed into the oxygen blast furnace. In this way, only the small-sized sintered ore needs to be returned to the sintering process, and the amount of returned ore in the sintering process is greatly reduced. The medium-sized sintered ore enters the oxygen blast furnace and is smelted simultaneously, and the large-sized sintered ore enters the traditional blast furnace and the oxygen blast furnace, thereby maintaining the air permeability and smelting effect of the traditional blast furnace. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 A schematic structural diagram of an ironmaking system for high-efficiency smelting in a carbon cycle blast furnace according to an exemplary embodiment of the present invention;

[0038] Figure 2 A schematic structural diagram of an ironmaking system for high-efficiency smelting in a carbon cycle blast furnace is shown as another exemplary embodiment of the present invention;

[0039] Figure 3 It is a schematic flow diagram of an ironmaking method for high-efficiency smelting in a carbon cycle blast furnace according to the present invention;

[0040] Among them, 1-sintering system; 101-sintering raw material bin; 102-sintering machine; 2-first screening system; 201-first screening device; 202-second screening device; 3-first blast furnace system; 301-conventional blast furnace; 302-first silo; 303-third screening device; 304-fourth screening device; 4-second blast furnace system; 401-oxygen blast furnace; 402-second silo; 403-fifth screening device; 404-sixth screening device; 405-particle silo; 5-blast furnace silo; 6-coarse screening device. DETAILED DESCRIPTION

[0041] 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.

[0042] It should be noted that in the present invention, the oxygen blast furnace can replace the traditional hot blast with pure oxygen blast, and the blast furnace top gas is decarburized and then circulated and injected, which causes the reduction potential in the furnace to increase, so that the charge has a higher metallization rate than the traditional blast furnace when it reaches the soft melting zone. Compared with the traditional blast furnace atmosphere, the oxygen blast furnace has a narrower or even disappearing droplet range in the oxygen blast furnace atmosphere, and the air permeability is significantly improved. Therefore, the oxygen blast furnace can accept sintered ore with smaller particle size.

[0043] Unless otherwise specified, all raw materials in the present invention can be purchased from the market, and the equipment used in the present invention can adopt conventional equipment in the relevant field or refer to the existing technology in the relevant field.

[0044] Figure 1 A schematic structural diagram of an ironmaking system for high-efficiency smelting in a carbon cycle blast furnace is shown as an exemplary embodiment of the present invention.

[0045] Please see attached Figure 1 As shown: an ironmaking system with high-efficiency smelting in a carbon cycle blast furnace, comprising a sintering system 1, a first screening system 2 connected to the sintering system 1, a first blast furnace system 3 connected to the first screening system 2, and a second blast furnace system 4. The sintering system 1 sintered to obtain sintered ores of various particle sizes, and the first screening system 2 screened the sintered ores into large-particle-size sintered ores, medium-particle-size sintered ores, and small-particle-size sintered ores. The first blast furnace system 3 comprises a conventional blast furnace 301 for smelting the large-particle-size sintered ores, the second blast furnace system 4 collects the large-particle-size sintered ores and the medium-particle-size sintered ores, and the second blast furnace system 4 comprises an oxygen blast furnace 401 for smelting the large-particle-size sintered ores and the medium-particle-size sintered ores.

[0046] In the specific implementation process, the particle size of the large-size sintered ore depends on the particle size range of the sintered ore that can be accepted by the first blast furnace system 3, the particle size of the medium-size sintered ore depends on the particle size range of the sintered ore that can be accepted by the second blast furnace system 4, and the particle size of the small-size sintered ore depends on the particle size range of the sintered ore that cannot be accepted by the second blast furnace system 4. The division of the particle size range is not absolute, and can change according to the change of the particle size range of the sintered ore that can be accepted by the first blast furnace system 3 and the second blast furnace system 4. For example: in the present invention, the particle size of the large-size sintered ore is greater than 5mm, the particle size of the medium-size sintered ore is 1-5mm, and the particle size of the small-size sintered ore is less than 1mm.

[0047] Please see attached Figure 1 As shown: In some embodiments, the first screening system 2 includes a first screening device 201 and a second screening device 202, the first screening device 201 is connected to the sintering system 1 and performs the first screening on the sintered ore of the sintering system 1, the screened material of the first screening device 201 is the large-grained sintered ore and leads to the first blast furnace system 3 and the second blast furnace system 4, the screened material of the first screening device 201 is the medium-grained sintered ore and the small-grained sintered ore; the second screening device 202 continues to screen the screened material of the first screening device 201 to separate the medium-grained sintered ore and the small-grained sintered ore, the medium-grained sintered ore leads to the second blast furnace system 4, and the small-grained sintered ore is returned to the sintering system 1 as return ore.

[0048] Please see attached Figure 1As shown: In some embodiments, the first blast furnace system 3 includes the conventional blast furnace 301, and also includes a first silo 302, a third screening device 303 and a fourth screening device 304. The first silo 302 is connected to the first screening device 201 and is used to collect the large-particle sintered ore transferred by the first screening device 201. During the transportation process, the sintered ore will form new medium-particle and small-particle sintered ore due to external factors such as collision. Therefore, the third screening device 303 is arranged between the first silo 302 and the conventional blast furnace 301. The screened material of the third screening device 303 is the large-particle sintered ore. The large-particle sintered ore is mixed with other furnace materials after coarse screening and then passed to the conventional blast furnace 301, ensuring that most of the sintered ore entering the conventional blast furnace 301 is large-particle material. The screened material of the third screening device 303 is medium-sized sintered ore and small-sized sintered ore, which are further screened by the fourth screening device 304 to separate medium-sized sintered ore and small-sized sintered ore. The medium-sized sintered ore is directed to the second blast furnace system 4, and the small-sized sintered ore is returned to the sintering system 1.

[0049] Please see attached Figure 1 As shown: In some embodiments, the second blast furnace system 4 includes the oxygen blast furnace 401, and also includes a second silo 402, a fifth screening device 403 connected to the second silo 402, a sixth screening device 404 connected to the fifth screening device 403, and a particle silo 405. Similarly, during the transportation process, the sintered ore will form new medium-sized and small-sized sintered ores due to external factors such as collision. Therefore, the fifth screening device 403 is arranged between the second silo 402 and the oxygen blast furnace 401. The screened material of the fifth screening device 403 is the large-particle sintered ore and is led to the oxygen blast furnace 401. The screened material of the fifth screening device 403 is the medium-sized sintered ore and the small-sized sintered ore formed in the transportation of the large-sized sintered ore. The sixth screening device 404 further separates the screened material of the fifth screening device 403 to obtain medium-sized sintered ore and small-sized sintered ore. The small-sized sintered ore is returned to the sintering system 1.

[0050] The particle silo 405 is connected to the second screening device 202, the fourth screening device 304 and the sixth screening device 404 and is used to collect the medium-sized sintered ore separated by the corresponding devices, or to collect the medium-sized sintered ore mixed with other furnace materials.

[0051] Please see attached Figure 1As shown: In some embodiments, a group of the sintering systems 1 can be used, and a group of the sintering systems 1 can be used in multiple blast furnace systems. Specifically, the sintering system 1 includes a sintering raw material bin 101 and a sintering machine 102 connected in sequence, and the sintering raw material bin 101 is also connected to the second screening device 202, the fourth screening device 304 and the sixth screening device 404 and is used to collect the small-sized sintered ore separated by the corresponding devices, or to collect the small-sized sintered ore mixed with other furnace materials. Small-sized return ore powder.

[0052] In some embodiments, since the blast furnace charge may also include pellets, lump ore, coke and other charges in addition to sintered ore, the first blast furnace system 3 and the second blast furnace system 4 may also include at least two blast furnace charge bins 5, each of which may be connected to a coarse screening device 6. The coarse screening device 6 of the first blast furnace system 3 may be connected to the conventional blast furnace 301, and the coarse screening device 6 may be connected to the fourth screening device 304; the coarse screening device 6 of the second blast furnace system 4 may be connected to the oxygen blast furnace 401, and the coarse screening device 6 may be connected to the sixth screening device 404. A group of blast furnace charge bins 5 and coarse screening devices 6 may be connected to store and screen a type of charge, respectively.

[0053] In some embodiments, the first screening device 201, the second screening device 202, the third screening device 303, the fourth screening device 304, the fifth screening device 403, the sixth screening device 404 and the coarse screening device 6 are all vibrating screens. According to the screening amount, the number of vibrating screens in each group of screening devices can be appropriately increased. According to the aforementioned sintered ore particle size range classification standard of the present invention, the sieve hole diameter of the first screening device 201, the third screening device 303, the fifth screening device 403 and the coarse screening device 6 is 5mm, and the sieve hole diameter of the second screening device 202, the fourth screening device 304 and the sixth screening device 404 is 1mm.

[0054] Working principle: In general, the sintering raw material bin 101 receives raw materials and return materials, and enters the sintering machine 102 for sintering together to obtain sintered ore. The large-grained sintered ore is screened out by the first screening device 201 and enters the conventional blast furnace 301 and the oxygen blast furnace 401 respectively. The conventional blast furnace 301 mainly smelts the large-grained sintered ore. The number of conventional blast furnaces 301 can be appropriately increased according to the amount of sintered ore. The medium- and small-grained sintered ore screened out by the first screening device 201 is further separated by the second screening device 202. The medium-grained sintered ore enters the particle bin 405, and the small-grained sintered ore is returned to the sintering raw material bin 101 as return ore. After the medium-grained sintered ore and the large-grained sintered ore are mixed and added with furnace materials such as pellet ore, lump ore, and coke, they are mixed and smelted in the oxygen blast furnace 401. The oxygen blast furnace 401 mainly smelts the medium-grained sintered ore.

[0055] Figure 2A schematic structural diagram of an ironmaking system for efficient smelting in a carbon cycle blast furnace is shown as another exemplary embodiment of the present invention.

[0056] When a set of sintering systems 1 cannot satisfy 2 blast furnace systems, it is therefore different from Figure 1 The ironmaking system shown, Figure 2 The ironmaking system shown uses two groups of sintering systems 1 and two groups of first screening systems 2, which are arranged one-to-one with two blast furnace systems, that is, the oxygen blast furnace 401 is connected to a group of sintering systems 1 and a group of first screening systems 2, and the traditional blast furnace 301 is also connected to a group of sintering systems 1 and a group of first screening systems 2, and the second screening devices 202 of the two groups of first screening systems 2 are both connected to the particle silo 405 of the second blast furnace system 4.

[0057] Figure 3 The present invention is a schematic flow chart of an iron-making method for efficient smelting in a carbon cycle blast furnace, showing an exemplary embodiment of the present invention.

[0058] Please see attached Figure 3 As shown, a carbon cycle blast furnace high-efficiency ironmaking method comprises the following steps:

[0059] S1: Sintering is performed through the sintering system 1 to obtain sintered ore.

[0060] S2: Screening the sintered ore according to the particle size to obtain large-size sintered ore, medium-size sintered ore and small-size sintered ore. The large-size sintered ore has a particle size greater than 5 mm, the medium-size sintered ore has a particle size of 1 to 5 mm, and the small-size sintered ore has a particle size less than 1 mm.

[0061] S3: The large-particle sintered ore enters the oxygen blast furnace 401 and the conventional blast furnace 301 for smelting, the medium-particle sintered ore enters the oxygen blast furnace 401 for smelting, and the small-particle sintered ore returns to the sintering system 1 for sintering again. Most of the large-particle sintered ore enters the conventional blast furnace 301 for smelting, and a small part of the large-particle sintered ore and the medium-particle sintered ore enter the oxygen blast furnace 401 for smelting together. The large-particle sintered ore is screened again before being transported into the oxygen blast furnace 401 and the conventional blast furnace 301 to separate the medium-particle sintered ore and the small-particle sintered ore produced during the transportation of the large-particle sintered ore. The medium-particle sintered ore and the small-particle sintered ore are further separated and enter the oxygen blast furnace 401 and the sintering system 1 respectively.

[0062] Combined with Figure 1 The ironmaking system shown in the figure is used to describe the specific implementation process of this method in detail:

[0063] S1. The sintering raw materials and the returned ore materials are mixed through the sintering raw material bin 101 and then enter the sintering machine 102, where they are sintered by exhaust air to obtain sintered ore.

[0064] S2. Screening:

[0065] (1) The first screening device 201 screens the sintered ore produced by the sintering machine 102 to separate out large-grained sintered ore with a particle size greater than 5 mm and sintered return ore with a particle size less than 5 mm; the sintered return ore with a particle size less than 5 mm is screened for the second time in the second screening device 202 to separate out medium-grained sintered ore with a particle size of 1-5 mm and small-grained sintered ore with a particle size less than 1 mm. Most of the large-grained sintered ore is stored in the first silo 302, a small part of the large-grained sintered ore is stored in the second silo 402, and the medium-grained sintered ore is stored in the particle silo 405.

[0066] (2) The third screening device 303 screens the large-particle sintered ore in the first silo 302 to separate large-particle sintered ore with a particle size greater than 5 mm and return ore with a particle size less than 5 mm; the return ore with a particle size less than 5 mm is screened for a second time by the fourth screening device 304 to separate medium-particle sintered ore with a particle size of 1-5 mm and small-particle sintered ore with a particle size less than 1 mm.

[0067] (3) The fifth screening device 403 screens the large-particle sintered ore in the second silo 402 to separate large-particle sintered ore with a particle size greater than 5 mm and return ore with a particle size less than 5 mm; the return ore with a particle size less than 5 mm is screened for a second time by the sixth screening device 404 to separate medium-particle sintered ore with a particle size of 1-5 mm and small-particle sintered ore with a particle size less than 1 mm.

[0068] (4) The coarse screening device 6 of the first blast furnace system 3 screens the corresponding charge in the blast furnace charge bin 5, and screens out large-size charge with a particle size greater than 5 mm and return charge with a particle size less than 5 mm, and the return charge is mixed with the return ore and screened together through the fourth screening device 304. The coarse screening device 6 of the second blast furnace system 4 screens the corresponding charge in the blast furnace charge bin 5, and screens out large-size charge with a particle size greater than 5 mm and return charge with a particle size less than 5 mm, and the return charge is mixed with the return ore and screened together through the sixth screening device 404. The return charge is a mixture of medium-size charge and small-size charge.

[0069] S3. Charging and smelting:

[0070] (1) The sintered ore with a particle size of less than 1 mm is screened out by the fourth screening device 304 and the sixth screening device 404 and returned to the sintering machine 102 for sintering again. The obtained sintered ore is also subjected to the screening process of step S2.

[0071] (2) Most of the large-grained sintered ore and large-grained furnace charge are loaded into the conventional blast furnace 301, and the charge composition is 50-70% of large-grained sintered ore, 0-30% of pelletized ore, 0-8% of lump ore, 10-25% of medium-grained sintered ore and coke in layers into the oxygen blast furnace 401, and the medium-grained sintered ore is concentrated on the middle ring belt of the oxygen blast furnace 401 to ensure two gas flows at the center and the edge;

[0072] (3) A small amount of large-grained sintered ore, large-grained furnace charge in corresponding proportions, medium-grained sintered ore and medium-grained furnace charge are mixed and loaded into the oxygen blast furnace 401. The charge composition is 60-85% large-grained sintered ore, 0-40% pelletized ore, 0-10% lump ore and coke are layered and loaded into the conventional blast furnace 301 for smelting.

[0073] It should be noted that, 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. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0074] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A carbon cycle blast furnace high efficiency ironmaking system, It is characterized in that include: Sintering system, used for sintering to obtain sintered ore; A first screening system, connected to the sintering system, a first blast furnace system connected to the first screening system, the first blast furnace system comprising a conventional blast furnace; a second blast furnace system connected to the first screening system, the second blast furnace system comprising an oxygen blast furnace; The first screening system screens the sintered ore into large-particle-size sintered ore, medium-particle-size sintered ore and small-particle-size sintered ore, and the small-particle-size sintered ore is returned to the sintering system; the large-particle-size sintered ore enters the first blast furnace system and the second blast furnace system, and the medium-particle-size sintered ore enters the second blast furnace system.

2. The carbon cycle blast furnace high-efficiency ironmaking system according to claim 1, It is characterized in that The first screening system comprises: A first screening device is connected to the sintering system, the screened material of the first screening device is the large-size sintered ore, and the screened material of the first screening device is the return ore mixed with the medium-size sintered ore and the small-size sintered ore; The second screening device is connected to the first screening device and separates the returned ore into medium-sized sintered ore and small-sized sintered ore.

3. The carbon cycle blast furnace high-efficiency ironmaking system according to claim 2, It is characterized in that The first blast furnace system further comprises: A first silo of a conventional blast furnace, connected to the first screening device, for collecting the large-size sintered ore; A third screening device is connected to the first silo, the screened material of the third screening device is large-size sintered ore and leads to the conventional blast furnace, and the screened material of the third screening device is return ore mixed with medium-size sintered ore and small-size sintered ore; The fourth screening device is connected to the third screening device, and separates the returned ore into medium-sized sintered ore and small-sized sintered ore. The medium-sized sintered ore is led to the second blast furnace system, and the small-sized sintered ore is returned to the sintering system.

4. The carbon cycle blast furnace high-efficiency ironmaking system according to claim 3, It is characterized in that The second blast furnace system further comprises: A second silo, connected to the first screening device, for collecting the large-size sintered ore; a fifth screening device connected to the second silo, wherein the screened material of the fifth screening device is large-particle sintered ore and is led to the oxygen blast furnace, and the screened material of the fifth screening device is return ore mixed with medium-particle sintered ore and small-particle sintered ore; a sixth screening device, connected to the fifth screening device, for separating the returned ore into medium-sized sintered ore and small-sized sintered ore, wherein the small-sized sintered ore is returned to the sintering system; The particle silo is connected to the second screening device, the fourth screening device and the sixth screening device and is used to collect the medium-sized sintered ore separated by the corresponding devices.

5. The carbon cycle blast furnace high-efficiency ironmaking system according to claim 4, Features: The sintering system comprises a sintering raw material bin and a sintering machine which are connected in sequence. The sintering raw material bin is also connected to the second screening device, the fourth screening device and the sixth screening device and is used to collect the small-particle sintered ore separated by the corresponding devices.

6. The carbon cycle blast furnace high-efficiency ironmaking system according to claim 5, Features: The first blast furnace system and the second blast furnace system each further include at least two blast furnace charge bins, each of which is connected to a coarse screening device. The upper discharge of the coarse screening device of the first blast furnace system is connected to the conventional blast furnace, and the lower discharge of the screen is connected to the fourth screening device; The upper discharge of the coarse screening device of the second blast furnace system is connected to the oxygen blast furnace, and the lower discharge of the coarse screening device is connected to the sixth screening device.

7. The carbon cycle blast furnace high-efficiency ironmaking system according to claim 6, Features: The mesh size of the vibrating screen of the first screening device, the third screening device and the fifth screening device is 5 mm, and the mesh size of the vibrating screen of the second screening device, the fourth screening device and the sixth screening device is 1 mm.

8. A carbon cycle blast furnace high efficiency ironmaking method, It is characterized in that The following steps are involved: Sintered ore is obtained by sintering in a sintering system. Screening the sintered ore according to the particle size to obtain large-size sintered ore, medium-size sintered ore and small-size sintered ore; The large-particle-size sintered ore enters an oxygen blast furnace and a conventional blast furnace for smelting, the medium-particle-size sintered ore enters an oxygen blast furnace for smelting, and the small-particle-size sintered ore returns to the sintering system for sintering again.

9. The carbon cycle blast furnace high-efficiency ironmaking method according to claim 8, Features: The particle size of the large-size sintered ore is greater than 5 mm, the particle size of the medium-size sintered ore is 1 to 5 mm, and the particle size of the small-size sintered ore is less than 1 mm.

10. The carbon cycle blast furnace high-efficiency ironmaking method according to claim 8, Features: The large-particle sintered ore is screened again before being transported into the oxygen blast furnace and the traditional blast furnace to separate the medium-particle sintered ore and the small-particle sintered ore produced during the transportation of the large-particle sintered ore. The medium-particle sintered ore and the small-particle sintered ore are further separated and enter the oxygen blast furnace and the sintering system respectively.

Images