CN117431352A - Steel smelting system and method based on hydrogen-rich reducing gas injection - Google Patents
Steel smelting system and method based on hydrogen-rich reducing gas injection Download PDFInfo
- Publication number
- CN117431352A CN117431352A CN202311020457.4A CN202311020457A CN117431352A CN 117431352 A CN117431352 A CN 117431352A CN 202311020457 A CN202311020457 A CN 202311020457A CN 117431352 A CN117431352 A CN 117431352A
- Authority
- CN
- China
- Prior art keywords
- hydrogen
- furnace
- reducing gas
- rich reducing
- rich
- 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
- 239000007789 gas Substances 0.000 title claims abstract description 119
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 title claims abstract description 116
- 229910052739 hydrogen Inorganic materials 0.000 title claims abstract description 115
- 239000001257 hydrogen Substances 0.000 title claims abstract description 114
- 238000002347 injection Methods 0.000 title claims abstract description 28
- 239000007924 injection Substances 0.000 title claims abstract description 28
- 238000003723 Smelting Methods 0.000 title claims abstract description 27
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 26
- 239000010959 steel Substances 0.000 title claims abstract description 26
- 238000000034 method Methods 0.000 title claims abstract description 18
- 239000002245 particle Substances 0.000 claims abstract description 50
- 239000002028 Biomass Substances 0.000 claims abstract description 26
- 239000004033 plastic Substances 0.000 claims abstract description 26
- 229920003023 plastic Polymers 0.000 claims abstract description 26
- 239000002699 waste material Substances 0.000 claims abstract description 25
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 claims abstract description 10
- 239000002817 coal dust Substances 0.000 claims abstract description 10
- UICBCXONCUFSOI-UHFFFAOYSA-N n'-phenylacetohydrazide Chemical compound CC(=O)NNC1=CC=CC=C1 UICBCXONCUFSOI-UHFFFAOYSA-N 0.000 claims abstract description 8
- 238000005261 decarburization Methods 0.000 claims abstract description 7
- 239000000571 coke Substances 0.000 claims description 37
- 239000000463 material Substances 0.000 claims description 26
- 239000003245 coal Substances 0.000 claims description 25
- 229910052799 carbon Inorganic materials 0.000 claims description 18
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 17
- 229910045601 alloy Inorganic materials 0.000 claims description 17
- 239000000956 alloy Substances 0.000 claims description 17
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 16
- 229910000746 Structural steel Inorganic materials 0.000 claims description 15
- 229910001315 Tool steel Inorganic materials 0.000 claims description 15
- 238000006243 chemical reaction Methods 0.000 claims description 9
- 230000005611 electricity Effects 0.000 claims description 8
- 229910052742 iron Inorganic materials 0.000 claims description 8
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 8
- 238000005266 casting Methods 0.000 claims description 7
- 230000008569 process Effects 0.000 claims description 7
- 239000010935 stainless steel Substances 0.000 claims description 7
- 238000005507 spraying Methods 0.000 claims description 6
- 238000009628 steelmaking Methods 0.000 claims description 6
- 238000005868 electrolysis reaction Methods 0.000 claims description 5
- 239000000203 mixture Substances 0.000 claims description 5
- 229910001220 stainless steel Inorganic materials 0.000 claims description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 5
- 239000003345 natural gas Substances 0.000 claims description 4
- 238000010248 power generation Methods 0.000 claims description 4
- 238000002407 reforming Methods 0.000 claims description 4
- 229910001018 Cast iron Inorganic materials 0.000 claims description 3
- 229910000677 High-carbon steel Inorganic materials 0.000 claims description 3
- 230000009471 action Effects 0.000 claims description 3
- 238000002156 mixing Methods 0.000 claims description 3
- 229920002165 CarbonCast Polymers 0.000 claims description 2
- 229910001021 Ferroalloy Inorganic materials 0.000 claims description 2
- 238000010891 electric arc Methods 0.000 claims description 2
- QMQXDJATSGGYDR-UHFFFAOYSA-N methylidyneiron Chemical compound [C].[Fe] QMQXDJATSGGYDR-UHFFFAOYSA-N 0.000 claims description 2
- 229910052761 rare earth metal Inorganic materials 0.000 claims description 2
- 150000002910 rare earth metals Chemical class 0.000 claims description 2
- 229910000805 Pig iron Inorganic materials 0.000 claims 1
- 230000000694 effects Effects 0.000 description 5
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 4
- 239000000843 powder Substances 0.000 description 4
- 238000009417 prefabrication Methods 0.000 description 4
- 230000002411 adverse Effects 0.000 description 3
- 238000004939 coking Methods 0.000 description 3
- 238000005265 energy consumption Methods 0.000 description 3
- YZCKVEUIGOORGS-OUBTZVSYSA-N Deuterium Chemical compound [2H] YZCKVEUIGOORGS-OUBTZVSYSA-N 0.000 description 2
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 229910002092 carbon dioxide Inorganic materials 0.000 description 2
- 239000001569 carbon dioxide Substances 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 239000003638 chemical reducing agent Substances 0.000 description 2
- 238000002485 combustion reaction Methods 0.000 description 2
- 239000000446 fuel Substances 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 230000035699 permeability Effects 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 239000007795 chemical reaction product Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000002309 gasification Methods 0.000 description 1
- 150000002431 hydrogen Chemical class 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000010310 metallurgical process Methods 0.000 description 1
- 238000005272 metallurgy Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000008929 regeneration Effects 0.000 description 1
- 238000011069 regeneration method Methods 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B7/00—Blast furnaces
- C21B7/002—Evacuating and treating of exhaust gases
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B5/00—Making pig-iron in the blast furnace
- C21B5/001—Injecting additional fuel or reducing agents
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B5/00—Making pig-iron in the blast furnace
- C21B5/06—Making pig-iron in the blast furnace using top gas in the blast furnace process
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B7/00—Blast furnaces
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D3/00—Charging; Discharging; Manipulation of charge
- F27D3/08—Screw feeders; Screw dischargers
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B5/00—Making pig-iron in the blast furnace
- C21B5/001—Injecting additional fuel or reducing agents
- C21B2005/005—Selection or treatment of the reducing gases
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B2100/00—Handling of exhaust gases produced during the manufacture of iron or steel
- C21B2100/20—Increasing the gas reduction potential of recycled exhaust gases
- C21B2100/26—Increasing the gas reduction potential of recycled exhaust gases by adding additional fuel in recirculation pipes
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B2100/00—Handling of exhaust gases produced during the manufacture of iron or steel
- C21B2100/20—Increasing the gas reduction potential of recycled exhaust gases
- C21B2100/28—Increasing the gas reduction potential of recycled exhaust gases by separation
- C21B2100/282—Increasing the gas reduction potential of recycled exhaust gases by separation of carbon dioxide
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B2100/00—Handling of exhaust gases produced during the manufacture of iron or steel
- C21B2100/60—Process control or energy utilisation in the manufacture of iron or steel
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
Abstract
The invention discloses a steel smelting system and a method based on hydrogen-rich reducing gas injection, comprising a blast furnace and a hydrogen-rich reducing gas prefabricating furnace; injecting hydrogen-rich reducing gas and pure hydrogen from a hydrogen-rich reducing gas prefabricating furnace into the blast furnace; introducing the generated blast furnace top gas into a hydrogen-rich reducing gas prefabricated furnace for decarburization; the hydrogen-rich reducing gas prefabricating furnace comprises pyrodine, biomass particles and waste plastic particles, and dry coal dust and pure oxygen are injected into the hydrogen-rich reducing gas prefabricating furnace to prepare the hydrogen-rich reducing gas.
Description
Technical Field
The invention relates to steel smelting, in particular to a steel smelting system and method based on hydrogen-rich reducing gas injection.
Background
The main fuel, framework and reducing agent for smelting molten iron in the blast furnace are coke. Coke is obtained from coking plants by retorting coal at elevated temperatures of about 1000 ℃. The coking process produces a large amount of harmful chemical pollutants, which are costly, and crushed coke and diced coke produced during the coking process generally cannot directly enter the blast furnace in order to ensure the gas permeability of the blast furnace.
Reducing the coke ratio of the blast furnace is a key to energy conservation of the blast furnace. In the traditional blast furnace smelting, low coal dust is mainly blown into the blast furnace to partially replace coke. However, a large amount of coal injection brings a series of adverse effects to blast furnace smelting. For example, pulverized coal can be heated, decomposed, combusted, slagging and the like in a blast furnace, so that the reaction in a swirling zone is complex and the operation is difficult; as the coal injection amount increases, the soft melting belt expands, and the coke is seriously damaged, so that the coal injection is limited by the quality of the coke; the increase of unburned coal powder can further deteriorate the working state of a blast furnace reflow zone and a slag forming zone; and the oxygen-enriched large coal injection can cause upper cooling and lower heating of the blast furnace.
In addition, blast furnace top gas is produced during blast furnace smelting. The blast furnace gas contains CO and CO 2 . In order to recycle CO in the blast furnace gas, the blast furnace gas is re-blown back to the blast furnace, and then the CO in the blast furnace gas needs to be removed before the re-blowing 2 This is also a problem.
The hydrogen has the advantages of green regeneration, high reducibility, clean and no pollution. Hydrogen is largely used instead of carbon as fuel and reductant for metallurgical processes, the reaction product being water. Compared with the traditional carbon metallurgy, the method can fundamentally reduce carbon emission and realize the aim of clean production.
H in waste plastic gasification products compared to coal 2 The ratio of the carbon dioxide to the carbon dioxide is far greater than that of pulverized coal injection, which is more favorable for high-temperature reduction of iron oxide, but the direct injection of plastics by a blast furnace is still in a research stage at present.
Another clean renewable energy source, biomass particles, itself has a higher heating value and "carbon recycle, carbon neutral" characteristics. After being sprayed into the blast furnace, the method not only can make up for the heat loss of the lower part of the blast furnace caused by hydrogen, but also can save coal resources, reduce the possibility that the air permeability of the blast furnace is affected by the unburnt coal powder, and can not generate redundant carbon emission. However, existing conventional tuyeres do not allow for the mixing of gas and biomass particles.
Disclosure of Invention
In view of the above-mentioned drawbacks of the prior art, the present invention provides a steel smelting system based on injection of hydrogen-rich reducing gas, comprising a blast furnace and a hydrogen-rich reducing gas pre-furnace; injecting hydrogen-rich reducing gas and pure hydrogen from a hydrogen-rich reducing gas prefabricating furnace into the blast furnace; the generated blast furnace top gas circularly enters a hydrogen-rich reducing gas prefabricated furnace for decarburization; the material column in the hydrogen-rich reducing gas prefabricating furnace comprises pyrodine, biomass particles and waste plastic particles, and meanwhile, dry coal dust and pure oxygen are also injected into the hydrogen-rich reducing gas prefabricating furnace to prepare the hydrogen-rich reducing gas.
Further, the blast furnace includes an iron-making blast furnace, a cast iron blast furnace, and a ferroalloy blast furnace.
Further, the dry pulverized coal is hydrogen-rich pulverized coal.
Further, pure hydrogen is green electricity prepared by blast furnace, converter gas power generation, photovoltaic, wind power, nuclear energy, hydraulic power and grid valley electricity, is prepared by a water electrolysis mode, or is prepared by reforming and purifying hydrogen-rich gas such as coke oven gas, natural gas and the like.
Further, molten iron produced by the blast furnace is supplied to a steelmaking primary furnace including a converter, an arc furnace for producing carbon structural steel, alloy structural steel, low alloy high strength structural steel, carbon tool steel, alloy tool steel, high speed tool steel, high carbon cast iron, and stainless steel, and special purpose steels added with specific alloy elements including rare earth; the special purpose steel comprises marine corrosion resistant steel; section bar, plate, pipe, bar and wire rolled from the steel.
Further, a double-cylinder spiral distributor is adopted at a feed inlet of the hydrogen-rich reducing gas prefabricating furnace, and the double-cylinder spiral distributor comprises an outer cylinder; the upper part in the outer cylinder is a spiral material channel, and the lower part is an inner cylinder; the inner cylinder extends downwards below the outer cylinder, the length of the inner cylinder is set to enable the outlet to be immersed into a material column in the hydrogen-rich reducing gas prefabricating furnace, and a plurality of pressure equalizing holes are formed in the part of the inner cylinder extending beyond the outer cylinder so as to equalize the pressure in the inner cylinder and the furnace.
The invention also provides a steel smelting method based on hydrogen-rich reducing gas injection, which comprises the following steps:
(1) Adding pyrodine, biomass particles and waste plastic particles into a hydrogen-rich reducing gas prefabricating furnace, spraying dry coal dust and pure oxygen at the same time, and burning to prepare the hydrogen-rich reducing gas;
(2) Mixing the hydrogen-rich reducing gas from the hydrogen-rich reducing gas prefabricating furnace with pure hydrogen and then spraying the mixture into a blast furnace;
(3) Introducing the generated blast furnace top gas into a hydrogen-rich reducing gas prefabricated furnace for decarburization;
(4) Simultaneously spraying pure oxygen into the blast furnace;
(5) Molten iron produced by a blast furnace is supplied to a steelmaking primary smelting furnace including a converter and an arc furnace to produce carbon structural steel, alloy structural steel, low alloy high strength structural steel, carbon tool steel, alloy tool steel, high speed tool steel, high carbon steel castings, high carbon iron castings and stainless steel.
Further, the dry pulverized coal is hydrogen-rich pulverized coal.
Further, pure hydrogen is green electricity prepared by blast furnace, converter gas power generation, photovoltaic, wind power, nuclear energy, hydraulic power and grid valley electricity, is prepared by a water electrolysis mode, or is prepared by reforming and purifying hydrogen-rich gas such as coke oven gas, natural gas and the like.
Further, a double-cylinder spiral distributor is adopted at a feed inlet of the hydrogen-rich reducing gas prefabricating furnace, and the double-cylinder spiral distributor comprises an outer cylinder; the upper part in the outer cylinder is a spiral material channel, and the lower part is an inner cylinder; the inner cylinder extends downwards below the outer cylinder, the length of the inner cylinder is set to enable the outlet to be immersed into a material column in the hydrogen-rich reducing gas prefabrication furnace, and a plurality of pressure equalizing holes are formed in the part of the inner cylinder extending beyond the outer cylinder so as to equalize the pressure in the inner cylinder and the furnace; the mixture of the coke breeze, the biomass particles and the waste plastic particles enters the spiral material channel from the upper part, and the movement track of the coke breeze is closer to the outer cylinder under the action of inertia because the density of the coke breeze is high in the process of falling along the spiral material channel, and the density of the biomass particles and the waste plastic particles is low, and the movement track of the coke breeze is closer to the inner cylinder; after the spiral material channel, most of the coke breeze enters the furnace from the shorter outer cylinder to participate in the reaction in the furnace earlier, and most of the biomass particles and waste plastic particles enter the furnace from the longer inner cylinder to participate in the reaction in the furnace later.
The invention adopts the hydrogen-rich reducing gas prefabricating furnace, so that coal dust, coke breeze, biomass particles, waste plastic particles and the like are not suitable for directly entering the blast furnace, but resources which are beneficial to reducing the energy consumption of the blast furnace are prefabricated into the hydrogen-rich reducing gas, and then the hydrogen-rich reducing gas and the hydrogen gas can be sprayed into the blast furnace together. The coal powder is prefabricated into hydrogen-rich reducing gas, so that adverse effects of coal injection on blast furnace conditions can be eliminated; the preparation method has the advantages that the pyrodine, the biomass particles and the waste plastic particles are prefabricated into hydrogen-rich reducing gas, so that resources can be fully utilized and recovered. Will beThe blast furnace gas is introduced into the hydrogen-rich reducing gas prefabricating furnace, so that the decarburization of the blast furnace gas can be conveniently realized. More importantly, the comprehensive treatment of the various resources by the hydrogen-rich reducing gas prefabricating furnace is uniformly converted into the hydrogen-rich reducing gas, so that the CO and the H can be dynamically adjusted by a control system according to the component change in the hydrogen-rich reducing gas during the subsequent mixed injection of pure hydrogen 2 Thereby realizing the control of the reducing atmosphere and heat of the blast furnace and interchangeably controlling the furnace ore. In conclusion, through unified recovery, conversion and utilization of resources, the invention reduces the energy consumption of the blast furnace, thereby reducing the carbon emission of steel smelting. The invention also provides a double-cylinder spiral distributor, which can lead the consumption speed of biomass particles and waste plastic particles which burn faster and the consumption speed of the coke oven which burn slower to be converged. Therefore, the raw materials of the material column in the furnace are distributed more uniformly in the prefabrication process of the hydrogen-rich reducing gas, and the temperature in the furnace is more balanced.
The conception, specific structure, and technical effects of the present invention will be further described with reference to the accompanying drawings to fully understand the objects, features, and effects of the present invention.
Drawings
FIG. 1 is a schematic diagram of a hydrogen-rich reducing gas injection-based steel smelting system in accordance with a preferred embodiment of the present invention;
FIG. 2 is a schematic view of a hydrogen-rich reducing gas prefabrication furnace in a preferred embodiment of the present invention;
FIG. 3 is a schematic view of a double-drum screw type distributor in a preferred embodiment of the present invention;
fig. 4 is a schematic view of a hydrogen-rich reducing gas preform furnace using the twin drum screw distributor of fig. 3.
Detailed Description
The following description of the preferred embodiments of the present invention refers to the accompanying drawings, which make the technical contents thereof more clear and easy to understand. The present invention may be embodied in many different forms of embodiments and the scope of the present invention is not limited to only the embodiments described herein.
A steel smelting system based on injection of hydrogen-rich reducing gas in a preferred embodiment of the present invention is shown in fig. 1, and includes a blast furnace 2 and a hydrogen-rich reducing gas pre-furnace 1. The blast furnace 2 is charged with the hydrogen-rich reducing gas from the hydrogen-rich reducing gas preform 1, hydrogen gas obtained by green electrolysis, and pure oxygen, and molten iron is smelted. Molten iron produced by the blast furnace 2 is then fed into a steelmaking process and fed into a steelmaking primary smelting furnace such as a converter and an electric arc furnace for producing carbon structural steel, alloy structural steel, low alloy high strength structural steel, carbon tool steel, alloy tool steel, high-speed tool steel, high-carbon steel castings, high-carbon iron castings and stainless steel.
For prefabricating the hydrogen-rich reducing gas, the coke breeze, biomass particles and waste plastic particles are added from the top of the hydrogen-rich reducing gas prefabricating furnace 1, dry coal dust and industrial pure oxygen are sprayed from the furnace body of the hydrogen-rich reducing gas prefabricating furnace 1, and meanwhile, the blast furnace gas of the blast furnace 2 is also introduced into the hydrogen-rich reducing gas prefabricating furnace 2. The dry coal fines are preferably hydrogen-rich coal fines.
As shown in FIG. 2, the hydrogen-rich reducing gas prefabricating furnace 1 in the preferred embodiment of the invention has ash 13 at the lower part of the furnace body, and diced coke 11, biomass particles and waste plastic particles 12 in the middle part, and coal dust and industrial pure oxygen are sprayed simultaneously for combustion to generate CO and H 2 The hydrogen-rich reducing gas is discharged from the upper part of the body of the hydrogen-rich reducing gas pre-furnace 1 and blown into the blast furnace 2.
CO in blast furnace gas introduced into hydrogen-rich reducing gas pre-furnace 1 2 Reacts with the coke in the furnace and is reduced to CO.
The invention adopts the hydrogen-rich reducing gas prefabricating furnace, so that coal dust, coke breeze, biomass particles, waste plastic particles and the like are not suitable for directly entering the blast furnace, but resources which are beneficial to reducing the energy consumption of the blast furnace are prefabricated into the hydrogen-rich reducing gas, and then the hydrogen-rich reducing gas and the hydrogen gas can be sprayed into the blast furnace together. The coal powder is prefabricated into hydrogen-rich reducing gas, so that adverse effects of coal injection on blast furnace conditions can be eliminated; the preparation method has the advantages that the pyrodine, the biomass particles and the waste plastic particles are prefabricated into hydrogen-rich reducing gas, so that resources can be fully utilized and recovered. Introducing blast furnace gas into hydrogen-rich reducing gas prefabricating furnaceThe decarburization of the blast furnace gas can be conveniently realized. More importantly, the comprehensive treatment of the various resources by the hydrogen-rich reducing gas prefabricating furnace is uniformly converted into the hydrogen-rich reducing gas, so that the CO and the H can be dynamically adjusted by a control system according to the component change in the hydrogen-rich reducing gas during the subsequent mixed injection of pure hydrogen 2 Thereby realizing the control of the reducing atmosphere and heat of the blast furnace and interchangeably controlling the furnace ore.
Compared with the coke, the biomass particles and the waste plastic particles have small density and quick combustion, and if the biomass particles, the waste plastic particles and the coke are uniformly distributed, the coke in a material column in the hydrogen-rich reducing gas prefabricating furnace is easily accumulated, so that the temperature in the furnace is uneven, the furnace condition is fluctuated, and even safety accidents occur. In a further embodiment according to the invention, as shown in fig. 3 and 4, a double-cylinder screw distributor is used at the feed inlet of the hydrogen-rich reducing gas pre-furnace 1, comprising an outer cylinder 2. The upper part of the outer cylinder 2 is provided with a spiral material channel 3, and the lower part is provided with an inner cylinder 4. The inner cylinder 4 extends downwards below the outer cylinder 2 to a length such that its outlet is submerged in the column in the hydrogen-rich reducing gas prefabricating furnace. A plurality of equalizing holes 5 are arranged at the part of the inner cylinder 4 extending beyond the outer cylinder 2 so as to equalize the pressure in the inner cylinder 4 and the furnace, thereby avoiding unsmooth blanking. The mixture of the coke breeze, the biomass particles and the waste plastic particles in the inner cylinder 4 enters the spiral material channel 3 from the upper part, and the movement track of the coke breeze is closer to the outer cylinder under the action of inertia because of the large density of the coke breeze in the process of falling along the spiral material channel, and the density of the biomass particles and the waste plastic particles is small, and the movement track of the coke breeze is closer to the inner cylinder. After the spiral material channel, most of the coke breeze enters the furnace from the shorter outer cylinder and participates in the reaction in the furnace earlier, most of biomass particles and waste plastic particles enter the furnace from the longer inner cylinder, and the outlet of the inner cylinder is immersed in the material column and naturally descends into the material column along with the consumption of the material column, so that the coke breeze participates in the reaction in the furnace later. This makes it possible to achieve a convergence of the consumption rates of the faster burning biomass particles and waste plastic particles and the slower burning pyrodine, even though they are fed into the furnace at the same time, due to the different starting times for the reactions involved. Therefore, the raw materials of the material column in the furnace are distributed more uniformly in the prefabrication process of the hydrogen-rich reducing gas, and the temperature in the furnace is more balanced.
The foregoing describes in detail preferred embodiments of the present invention. It should be understood that numerous modifications and variations can be made in accordance with the concepts of the invention by one of ordinary skill in the art without undue burden. Therefore, all technical solutions which can be obtained by logic analysis, reasoning or limited experiments based on the prior art by the person skilled in the art according to the inventive concept shall be within the scope of protection defined by the claims.
Claims (10)
1. A steel smelting system based on hydrogen-rich reducing gas injection is characterized by comprising a blast furnace and a hydrogen-rich reducing gas prefabricating furnace; injecting hydrogen-rich reducing gas and pure hydrogen from a hydrogen-rich reducing gas prefabricating furnace into the blast furnace; the generated blast furnace top gas circularly enters a hydrogen-rich reducing gas prefabricated furnace for decarburization; the material column in the hydrogen-rich reducing gas prefabricating furnace comprises pyrodine, biomass particles and waste plastic particles, and meanwhile, dry coal dust and pure oxygen are also injected into the hydrogen-rich reducing gas prefabricating furnace to prepare the hydrogen-rich reducing gas.
2. The hydrogen-rich reducing gas injection-based steel smelting system according to claim 1, wherein the blast furnace includes an iron-making blast furnace, a blast furnace for casting pig iron, a blast furnace for ferroalloy.
3. The steel smelting system based on hydrogen-rich reducing gas injection according to claim 1, wherein the dry pulverized coal is hydrogen-rich pulverized coal.
4. The steel smelting system based on the injection of hydrogen-rich reducing gas according to claim 1, wherein the pure hydrogen is green electricity prepared by blast furnace, converter gas power generation and photovoltaic, wind power, nuclear energy, hydraulic power and grid valley electricity, prepared by water electrolysis or prepared by reforming and purifying hydrogen-rich gas such as coke oven gas, natural gas and the like.
5. The hydrogen-rich reducing gas injection-based steel smelting system according to claim 1, wherein molten iron produced by the blast furnace is supplied to a steelmaking primary furnace including a converter, an electric arc furnace for producing carbon structural steel, alloy structural steel, low alloy high strength structural steel, carbon tool steel, alloy tool steel, high speed tool steel, high carbon cast iron, and stainless steel, and special purpose steels added with specific alloy elements including rare earth; the special purpose steel comprises marine corrosion resistant steel; section bar, plate, pipe, bar and wire rolled from the steel.
6. The steel smelting system based on the injection of the hydrogen-rich reducing gas, as set forth in claim 1, wherein a double-cylinder spiral distributor is adopted at the feed inlet of the hydrogen-rich reducing gas prefabricating furnace, comprising an outer cylinder; the upper part in the outer cylinder is a spiral material channel, and the lower part is an inner cylinder; the inner cylinder extends downwards below the outer cylinder, the length of the inner cylinder is set to enable the outlet of the inner cylinder to be immersed into a material column in the hydrogen-rich reducing gas prefabricating furnace, and a plurality of pressure equalizing holes are formed in the part of the inner cylinder extending beyond the outer cylinder so as to equalize the pressure in the inner cylinder and the furnace.
7. The steel smelting method based on hydrogen-rich reducing gas injection is characterized by comprising the following steps:
(1) Adding pyrodine, biomass particles and waste plastic particles into a hydrogen-rich reducing gas prefabricating furnace, spraying dry coal dust and pure oxygen at the same time, and burning to prepare the hydrogen-rich reducing gas;
(2) Mixing the hydrogen-rich reducing gas from the hydrogen-rich reducing gas prefabricating furnace with pure hydrogen and then spraying the mixture into a blast furnace;
(3) Introducing the generated blast furnace top gas into a hydrogen-rich reducing gas prefabricated furnace for decarburization;
(4) Simultaneously spraying pure oxygen into the blast furnace;
(5) Molten iron produced by a blast furnace is supplied to a steelmaking primary smelting furnace including a converter and an arc furnace to produce carbon structural steel, alloy structural steel, low alloy high strength structural steel, carbon tool steel, alloy tool steel, high speed tool steel, high carbon steel castings, high carbon iron castings and stainless steel.
8. The steel smelting method based on hydrogen-rich reducing gas injection according to claim 7, wherein the dry pulverized coal is hydrogen-rich pulverized coal.
9. The steel smelting method based on the injection of hydrogen-rich reducing gas according to claim 7, wherein pure hydrogen is green electricity prepared by blast furnace, converter gas power generation and photovoltaic, wind, nuclear, hydraulic and grid valley electricity, prepared by water electrolysis or prepared by reforming and purifying hydrogen-rich gas such as coke oven gas, natural gas and the like.
10. The steel smelting method based on hydrogen-rich reducing gas injection as claimed in claim 7, wherein a double-cylinder spiral distributor is adopted at the feed inlet of the hydrogen-rich reducing gas prefabricating furnace, and comprises an outer cylinder; the upper part in the outer cylinder is a spiral material channel, and the lower part is an inner cylinder; the inner cylinder extends downwards below the outer cylinder, the length of the inner cylinder is set to enable the outlet of the inner cylinder to be immersed into a material column in the hydrogen-rich reducing gas prefabricating furnace, and a plurality of pressure equalizing holes are formed in the part of the inner cylinder extending beyond the outer cylinder so as to equalize the pressure in the inner cylinder and the furnace; the mixture of the coke breeze, the biomass particles and the waste plastic particles enters the spiral material channel from the upper part, and the movement track of the coke breeze is closer to the outer cylinder under the action of inertia because the density of the coke breeze is high in the process of falling along the spiral material channel, and the density of the biomass particles and the waste plastic particles is low, and the movement track of the coke breeze is closer to the inner cylinder; after the spiral material channel, most of the coke breeze enters the furnace from the shorter outer cylinder to participate in the reaction in the furnace earlier, and most of the biomass particles and waste plastic particles enter the furnace from the longer inner cylinder to participate in the reaction in the furnace later.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311020457.4A CN117431352A (en) | 2023-08-15 | 2023-08-15 | Steel smelting system and method based on hydrogen-rich reducing gas injection |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311020457.4A CN117431352A (en) | 2023-08-15 | 2023-08-15 | Steel smelting system and method based on hydrogen-rich reducing gas injection |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117431352A true CN117431352A (en) | 2024-01-23 |
Family
ID=89550470
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311020457.4A Pending CN117431352A (en) | 2023-08-15 | 2023-08-15 | Steel smelting system and method based on hydrogen-rich reducing gas injection |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117431352A (en) |
-
2023
- 2023-08-15 CN CN202311020457.4A patent/CN117431352A/en active Pending
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US10988818B2 (en) | Efficient long-service-life blowing method and system for vanadium extraction-decarburization duplex converters | |
| CN113774178B (en) | Production system for coupling European smelting furnace and hydrogen-rich carbon circulating blast furnace | |
| CN110423854B (en) | Electric energy full-hydrogen flash reduction direct steelmaking system and process | |
| CN1216154C (en) | Blast furnace iron-making technique with hydrogen-rich fuel gas, pure oxygen and thus high efficiency and low CO2 exhaust | |
| CN114672602B (en) | Method for smelting vanadium titanium ore by coke oven gas-based shaft furnace and smelting vanadium titanium ore by electric furnace in deep reduction mode | |
| CN115011746B (en) | CO2 circulation-based total oxygen/high oxygen-enriched iron-making gas-making system and operation method | |
| CN101296858B (en) | A method for producing hydrogen and/or other gases from steel plant wastes and waste heat | |
| CN111485043A (en) | Dephosphorization process and device for liquid steel slag | |
| CN105755196B (en) | A kind of Ferrous Metallurgy method of clean and effective | |
| CN102127610B (en) | Ironmaking equipment and process for direct smelting reduction of iron ore | |
| CN117431352A (en) | Steel smelting system and method based on hydrogen-rich reducing gas injection | |
| CN216838046U (en) | Oxygen-enriched side-blown converter for recovering iron from metal waste through enhanced reduction | |
| CN105886698A (en) | Energy-saving, environment-friendly and optimal-design efficient novel technology for short-process steelmaking | |
| CN115418428A (en) | Direct smelting reduction furnace | |
| CN101875991A (en) | Device and method for entrained-flow gasification iron making | |
| JP3189096B2 (en) | Method for producing steel in liquid bath and apparatus for carrying out the method | |
| CA1333662C (en) | Process for melting cold iron material | |
| CN112391535A (en) | Treatment and utilization device and method for recovering zinc oxide from metallurgical zinc-containing ash by suspension smelting reduction | |
| CN112662824A (en) | Blast furnace hydrogen-rich smelting process for efficiently utilizing metallurgical waste gas | |
| CN105821167A (en) | Blast furnace injection biodiesel iron smelting method | |
| CN114854924B (en) | Method and device for preparing low-phosphorus molten iron from high-phosphorus iron ore | |
| CN114480863B (en) | Resource utilization method of metallic nickel slag | |
| CN218435821U (en) | Direct smelting reduction furnace | |
| CN103392013A (en) | Method and apparatus for making liquid iron and steel | |
| CN216864215U (en) | Hydrogen shaft furnace iron-making device based on external preheating of furnace charge |
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 |