CN114317852B - 2500m 3 Low-carbon iron-making method of blast furnace gas carbon cycle - Google Patents
2500m 3 Low-carbon iron-making method of blast furnace gas carbon cycle Download PDFInfo
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Abstract
The invention discloses a 2500m liquid 3 The blast furnace gas carbon circulating low-carbon iron-smelting method is characterized by that the raw materials are uniformly distributed according to a certain proportion, and the sintered ore content is 70-75%, the pellet content is 10-15%, the green ore content is 3-5% and the waste steel content is 3-5%, so that a ore layer is formed in the furnace; the coke and the coke pieces or the small coke pieces are uniformly mixed according to the proportion, wherein the coke consumption is 250-280 kg/t molten iron; the coke particles or the small coke are added according to the mass percentage of 2 to 4 percent of the coke mass to form a coke layer in the furnace; the raw fuel used by the blast furnace is added into the blast furnace from the top of the furnace according to the sequential batch circulation of a coke layer and a mineral layer, cold oxygen with the oxygen enrichment rate of 90-99% is sprayed from a tuyere, and steam is added to adjust the theoretical combustion temperature to 2000-2100 ℃.
Description
Technical Field
The invention relates to a 2500m liquid 3 A low-carbon ironmaking method of blast furnace gas carbon cycle belongs to the technical field of blast furnace low-carbon ironmaking.
Background
The process technology of the modern blast furnace ironmaking process has been developed for hundreds of years, 90% of pig iron is produced by the traditional blast furnace ironmaking process, the carbon emission of the blast furnace ironmaking process accounts for more than 70% of the carbon emission of the ferrous metallurgy industry, the traditional blast furnace is developed to be an extremely high-efficiency reactor nowadays, theories and technologies such as high yield, low consumption, long service life, efficiency, high quality, environmental protection and the like have been developed to the prosperous period, the efficiency and the status of the theories and the technologies cannot be completely replaced by other technologies, if technical breakthrough can be made on the existing traditional blast furnace, the blast furnace is greenized and low-carbon, the innovation point of the traditional blast furnace for developing low-carbon technology is bound to be the main melody of the development of the iron and steel industry in the world, and the reduction of the fossil fuel consumption of the traditional blast furnace is one of main directions for realizing carbon emission reduction of the ferrous industry.
90% of the flows in China are blast furnace long flows, if the blast furnace flows cannot continue to produce due to carbon emission, trillions of blast furnace long flow assets are returned to zero, and huge pressure is brought to the value preservation of the assets in the steel industry in China. Therefore, the long flow of the blast furnace is continued, the green and low carbon of the long flow is realized, and the final carbon neutralization is the key technical work of the prior art carbon reduction in the steel industry.
At present, iron and steel enterprises achieve the aim of reducing carbon emission by reducing the fuel ratio of a blast furnace through technical means of improving the quality of coke and ore, optimizing the design of blast furnace equipment, strengthening process operation and the like. However, the conventional blast furnace is injected from the tuyere of the blast furnace to react with carbon elements in the blast furnace due to the use of high temperature blast, and the blast furnace contains 79% of N 2 So that the reducing gas in the material column in the blast furnace contains a large amount of N 2 The content of reducing gas for indirect reduction reaction of iron ore in the material column is not high, the indirect reduction degree is low, the chemical energy of coal gas can not be fully utilized, the indirect reduction of the iron ore on the upper part of a furnace body is insufficient, the iron ore still contains a large amount of iron oxide when reaching a soft melting zone and a furnace cylinder, the iron oxide and carbon in coke have strong direct reduction endothermic reaction, a large amount of coke is required to be consumed to supplement the heat for reduction of the iron oxide, the traditional blast furnace ironmaking fuel reaches the limit, therefore, the consumption of fossil fuel coke and coal powder can not be continuously reduced without adopting technical breakthrough, and the emission of iron and carbon per ton is still high.
Disclosure of Invention
The invention aims to provide a probe with the length of 2500m 3 The low-carbon ironmaking method of blast furnace gas carbon cycle can solve the problems that the prior blast furnace ironmaking fuel ratio reduction technology is limited and per ton of iron CO is generated in the prior art 2 The problem of high emission is solved, so as to achieve the purposes of reducing the solid fossil fuel of the blast furnace, improving the metallurgical efficiency of the blast furnace iron making and reducing CO in the blast furnace iron making process 2 The purpose of discharging.
The invention provides a 2500m liquid 3 The low-carbon ironmaking method of blast furnace gas carbon cycle comprises the following steps: 1. the raw materials are evenly distributed according to a certain proportion by four raw materials of alkaline sinter ore, acidic pellet ore, alkaline or acidic raw ore and scrap steel, and the raw materials comprise the following components in percentage by mass: the percentage of the sintered ore is the total mass of the raw materials according to the mass percentage70-75 percent of pellet ore, 3-5 percent of raw ore and 3-5 percent of scrap steel, wherein the mass percentage of the pellet ore is 10-15 percent of the total mass of the raw materials, and the mass percentage of the scrap steel is 3-5 percent of the total mass of the raw materials; the coke and the coke pieces or the small coke blocks are uniformly mixed according to the proportion, wherein the coke consumption is 250-280 kg/t molten iron; the coke particles or the small coke are added according to the mass percentage of 2 to 4 percent of the coke mass to form a coke layer in the furnace; 2. weighing raw fuel used by the blast furnace below the groove, charging and distributing equipment from the top of the blast furnace through a conveying belt, and alternately adding the raw fuel into the blast furnace from the top of the blast furnace according to the coke bed layer and the ore layer in turn in batch circulation at 2500m 3 The blast furnace adopts a platform and funnel distribution mode to ensure reasonable distribution of edge airflow and central airflow, the central airflow is stabilized through a funnel with the depth of 1.0-1.5m, stable and smooth edge airflow is obtained at the same time, a material line is controlled to be 1.5-1.8m, the iron ore is high-reducibility iron ore comprising alkaline sinter ore, acid pellet ore, acid or alkaline raw ore and scrap steel, the comprehensive charging grade of the iron ore is more than 59.5 percent, and the charging grade of the added scrap steel is more than 59 percent; 3. the blast furnace adopts more than 90 percent of ultrahigh oxygen-enriched or total oxygen smelting, coke oven gas, european and metallurgical furnace decarbonized gas and 2500m 3 The process of coupling the top gas circulation of the blast furnace is 2500m 3 The dust removal temperature of the blast furnace top gas reaches 100-150 ℃, then the gas temperature is reduced to 40-45 ℃ by adopting a heat exchanger to meet the gas inlet temperature requirement of a decarburization device, and steam generated after heat exchange of the heat exchanger is merged into a steam pipe network for removing CO 2 The system heats the gas for use, and the gas at the top of the blast furnace is subjected to CO removal 2 Pressurizing to 0.55Mpa, heating the multiple gas media to 950-1200 deg.C by gas heating furnace, and removing CO 2 Reducing CO in coal gas 2 The volume percentage content is less than 1 percent, and the volume percentage content is 2500m 3 Smelting with ultrahigh oxygen content or total oxygen content of more than 90% of a tuyere of the blast furnace, injecting high-temperature coal gas at 950-1200 ℃ into the blast furnace, and injecting high-temperature mixed coal gas to reduce the carbon amount burnt in front of the tuyere; 4. the cold oxygen with oxygen enrichment rate of 90-99% is sprayed from the tuyere, and the oxygen consumption of the pig iron is 300-500 Nm per 1t of smelted pig iron according to the adjustment of smelting parameters 3 The amount of steam is 50-100 kg, including water in coal gas, mixed coal gas 700-900 Nm 3 Normal temperature oxygen and various coal gas media are sprayed from the tuyere, and steam is added simultaneously to adjust the theoretical combustion temperature to 2000-2100 ℃.
The invention has the following effects:
1. on the basis of improving the safety of gas heating by a gas heating furnace, various low-temperature gas media (mixed gas) are sprayed into the blast furnace by high-temperature gas at 950-1200 ℃, the high-temperature mixed gas is sprayed, so that the quantity of carbon burnt in front of a tuyere can be reduced, and the heat brought by the hot gas replaces the heat burnt by coke in front of the tuyere under the condition of constant unit pig iron heat income, so that part of heat required by chemical reaction in the furnace and furnace charge heating is replaced, and the consumption of the solid fossil fuel coke is further reduced. .
2、2500m 3 Blast furnace super oxygen-rich or full oxygen tuyere blows and heats mixed coal gas for smelting, cold oxygen with oxygen enrichment rate of 90-99% is sprayed from the tuyere, and according to the adjustment of smelting parameters, the oxygen consumption of pig iron is 300-500 Nm per 1t smelted pig iron 3 The steam consumption is 50-100 kg (including water in the coal gas), and the mixed coal gas is 700-900 Nm 3 . After normal temperature oxygen is sprayed from a blast furnace tuyere, the theoretical combustion temperature of the blast furnace is increased, the gas quantity is reduced, and the excessive heat of a hearth area of the blast furnace and the insufficient heat of a furnace body part are caused. And the tuyere sprays normal temperature oxygen and a plurality of coal gas media (mixed coal gas), and simultaneously adds steam for adjusting the theoretical combustion temperature to 2000-2100 ℃, the steam and the water in the coal gas are evaporated and generate water gas reaction with the hot coke, and the reaction formula is as follows:
H 2 O= O 2 + H 2
H 2 O+C= H 2 + CO
2C+O 2 ＝2CO
the two reactions are strong endothermic reactions, which can effectively solve 2500m 3 The problem of 'lower heat' of ultrahigh oxygen-enriched or total oxygen furnace hearth of blast furnace, and a great amount of CO and H generated by reaction 2 Including injected gas compensation due to elimination of N 2 The gas quantity in the furnace hearth is reduced due to the furnace entering. At the same time byTo reduce N 2 The concentration of reducing gas in the furnace is changed from about 40 percent of that in a common blast furnace to nearly 80 percent (H) 2 + CO) or more, highly reducing H 2 Compared with the traditional blast furnace, the proportion of the coal gas is greatly improved, thereby enhancing the reduction capability of the whole stock column coal gas of the blast furnace.
3Fe 2 O 3 +CO→2Fe 3 O 4 +CO 2
Fe 3 O 4 +CO→3FeO+CO2
FeO+CO→Fe+CO 2
3Fe 2 O 3 +H 2 →2Fe 3 O 4 +H 2 O
Fe 3 O 4 +H 2 →3FeO+H 2 O
FeO+H 2 →Fe+H 2 O
3. The 2500m is solved by arranging a plurality of high-temperature coal gas medium (mixed coal gas) inlets at the position of the blast furnace body 3 The blast furnace body part of the blast furnace is insufficient in gas quantity and insufficient in heat, and meanwhile, the iron ore is further physically preheated to a certain degree, so that the whole heat utilization inside the blast furnace and the furnace burden can be smoothly carried out to achieve the best optimization effect. At the same time due to the solution of 2500m 3 The blast furnace can realize more reasonable and full utilization of carbon cycle by various coal gas media (mixed coal gas), thereby greatly reducing the usage amount of coke in the furnace and reducing the use of solid fossil fuel coke so as to reduce the carbon emission of the process.
In summary, the conventional blast furnace uses high temperature blast air injected from the blast furnace tuyere to react with carbon element in the blast furnace, and the blast air contains 79% of N 2 So that the reducing gas in the material column in the blast furnace contains a large amount of N 2 The content of reducing gas generated by indirect reduction reaction of iron ore in the material column is not high, the indirect reduction degree is low, the chemical energy of coal gas can not be fully utilized, the indirect reduction of the iron ore at the upper part of the furnace body is insufficient, and when the iron ore reaches a soft melting zone and a furnace cylinder, a large amount of ferrite is still containedThe compounds, which are strongly endothermic in direct reduction with the carbon in the coke, consume large amounts of coke to supplement the heat of iron oxide reduction. The invention provides a 2500m liquid 3 The low-carbon iron-smelting method of blast furnace gas carbon circulation realizes total oxygen blast, obviously reduces nitrogen in blast furnace top gas and simultaneously reduces CO and CO in blast furnace gas 2 Separation of CO 2 After recycling, the left high-concentration reduced coal gas CO + H 2 Then the mixture is conveyed to a tuyere and a furnace body through a pipeline to realize the CO and H in the blast furnace 2 The coal gas with high reduction potential is enriched again and used for reducing iron ore, and the carbon cycle technology of metallurgical coal gas is realized. By such continuous carbon circulation, the complete utilization of the carbon chemical energy in the coal gas is realized. In addition, by utilizing the gas circulation, a large amount of hydrogen-rich and carbon-containing substances in the gas can not waste the chemical energy, and the CO + H of the reducing gas 2 And the waste heat is circulated in the blast furnace, so that the consumption of fossil energy by a blast furnace flow is reduced. Therefore 2500m of the invention 3 The low-carbon metallurgy iron-making method of the carbon cycle of the gas of the large-scale blast furnace is an innovative key point for continuing the long-flow technology of the blast furnace, realizing the carbon emission reduction and carbon neutralization of the long-flow technology. The invention aims to utilize the coal gas generated by a blast furnace body, and the coal gas of the system is heated to 900-1200 ℃ by the technical upgrade of the hot blast stove of the system, so that the system is applied to the iron making of 2500m 3 In the process of the low-carbon metallurgy iron-making method of the carbon cycle of the coal gas of the large-scale blast furnace, the method is used for solving the problem of CO brought by the traditional blast furnace iron-making process 2 The problems of large discharge, serious environmental pollution, low productivity and the like; simultaneously, the decarburization gas of the Europe smelting furnace and the hydrogen-rich gas of the coke oven can be mixed and blown to realize the Europe smelting furnace and the 2500m 3 2500m for multiple coupling of large blast furnace and coke oven and injection of multiple gas media 3 A large blast furnace ironmaking method is used for solving the problems of low replacement ratio of injected coal gas and poor carbon reduction effect in the low-carbon blast furnace technology in the prior art, and the 2500m blast furnace ironmaking method is used 3 Large blast furnace with CO removal from top gas of blast furnace 2 High concentration of reduced gas CO + H 2 Then the coal is conveyed to a tuyere and a furnace body through a pipeline and is injected into the furnace to replace the purposes of injecting fossil fuel coal powder into a furnace cylinder and reducing the coke consumption in the furnace. The invention adoptsNormal temperature blast with oxygen content of 90-99.9% replaces high temperature hot air blast with oxygen content of 21%, and CO removal of the system is carried out by heating the system through a coal gas heating furnace 2 Heating the obtained coal gas, the decarbonized coal gas of the Ou-Meta furnace and the coke oven gas to 900-1300 deg.C, replacing coal powder with the heated high-temperature reducing coal gas, and spraying a part of the coal gas into the furnace at 2500m 3 One part of the large-scale blast furnace tuyere is sprayed into the lower part of the furnace body, so that the production efficiency of the blast furnace is improved, the utilization coefficient of the blast furnace can reach 3.0-4.0, and the fossil solid fuel ratio can be reduced to 280kg/t iron. The above-mentioned slave 2500m 3 After normal temperature oxygen is sprayed into the large-scale blast furnace tuyere, the theoretical combustion temperature of the blast furnace is raised, and 50-100 kg/t iron is added with steam for adjusting the theoretical combustion temperature to 2000-2100 ℃.
Drawings
FIG. 1 shows 2500m 3 A process flow schematic diagram of a low-carbon metallurgy iron-making method of blast furnace gas carbon circulation.
1-2500m 3 A blast furnace body; 2-a dust removal device; 3-a heat exchange device; 4-a pressurizing device; 5-CO 2 A removal device; 6-gas heating furnace; 7-tuyere injection structure; 8-a furnace body blowing structure.
Detailed Description
2500m 3 The low-carbon ironmaking method of blast furnace gas carbon cycle comprises the following steps: 1. the raw materials are evenly distributed according to a certain proportion by four raw materials of alkaline sinter ore, acidic pellet ore, alkaline or acidic raw ore and scrap steel, and the raw materials comprise the following components in percentage by mass: the percentage by mass of the sintered ore is 70-75% of the total mass of the raw materials, the percentage by mass of the pellet ore is 10-15% of the total mass of the raw materials, the percentage by mass of the green ore is 3-5% of the total mass of the raw materials, the percentage by mass of the scrap steel is 3-5% of the total mass of the raw materials, and an ore layer is formed in the furnace; the coke and the coke pieces or the small coke pieces are uniformly mixed according to the proportion, wherein the coke consumption is 250-280 kg/t molten iron; the coke particles or the small coke are added according to the mass percentage of 2 to 4 percent of the coke mass to form a coke layer in the furnace; 2. the raw fuel used by the blast furnace is weighed under the groove, and the raw fuel is fed from the top of the blast furnace through a conveying belt and distributed by a coke bed layer and a mineral layer in turnThe rings are alternately added into the blast furnace from the top of the furnace and are 2500m 3 The blast furnace adopts a platform and funnel distribution mode, the reasonable distribution of edge air flow and central air flow is ensured, the central air flow is stabilized through a funnel with the depth of 1.0-1.5m, the stable and smooth edge air flow is obtained at the same time, a material line is controlled to be 1.5-1.8m, the iron ore is high-reducibility iron ore comprising alkaline sinter ore, acidic pellet ore, acid or alkaline raw ore and steel scrap, the comprehensive furnace feeding grade of the iron ore is more than 59.5 percent, and the furnace feeding grade of the added steel scrap is more than 59 percent; 3. the blast furnace adopts more than 90 percent of ultrahigh oxygen-enriched or total oxygen smelting, coke oven gas, european and metallurgical decarburization gas and 2500m 3 2500m of blast furnace top gas circulation coupled process 3 The dust removal temperature of blast furnace top gas reaches 100-150 ℃, then the gas temperature is reduced to 40-45 ℃ by adopting a heat exchanger to meet the gas inlet temperature requirement of a decarburization device, and steam generated after heat exchange of the heat exchanger is merged into a steam pipe network for removing CO 2 The system heats the gas for use, and the gas at the top of the blast furnace is subjected to CO removal 2 Pressurizing to 0.55Mpa, heating the multiple coal gas media to 950-1200 deg.C by a coal gas heating furnace, and removing CO 2 Reducing CO in coal gas 2 The volume percentage content is less than 1 percent, and the particle size is 2500m 3 Smelting with ultrahigh oxygen content or total oxygen content of more than 90% of a tuyere of the blast furnace, injecting high-temperature coal gas at 950-1200 ℃ into the blast furnace, and injecting high-temperature mixed coal gas to reduce the carbon amount burnt in front of the tuyere; 4. the cold oxygen with oxygen enrichment rate of 90-99% is sprayed from the tuyere, and the oxygen consumption of the pig iron is 300-500 Nm per 1t of smelted pig iron according to the adjustment of smelting parameters 3 The steam consumption is 50-100 kg, the water content in the gas is contained, and the mixed gas is 700-900 Nm 3 Normal temperature oxygen and various coal gas media are sprayed from the tuyere, and steam is added simultaneously to adjust the theoretical combustion temperature to 2000-2100 ℃.
Refer to FIG. 1, 2500m 3 The production system of the low-carbon metallurgy iron-making method of blast furnace gas carbon cycle specifically comprises the following steps:
the 2500m 3 The process system in the low-carbon metallurgy iron-making method of blast furnace gas carbon cycle comprises 2500m 3 A blast furnace body 1, a furnace top gas dust removal device 2, a heat exchange device 3, a circulating pressure device 4, CO 2 Removal device 5 anda gas heating furnace 6 and a tuyere injection structure 7 with the length of 2500m 3 The blast furnace body hearth is annularly provided with a tuyere injection structure 7, and the middle part of the blast furnace body is provided with a body heating gas body injection structure 8.
The tuyere injection structure is used for injecting pure oxygen and heating various coal gas media (mixed coal gas) and steam. Tuyere heating gas and furnace body heating gas inlet for blowing in and circularly removing CO from furnace top 2 Then the high-temperature coal gas heated by a coal gas heating furnace is adopted.
The 2500m 3 The low-carbon metallurgical iron-making method of blast furnace gas carbon circulation can make the blast furnace gas undergo the process of decarbonization, then the decarbonization is added into 2500m 3 A furnace top decarburization gas circulation pipeline for blast furnace gas.
The 2500m 3 Low-carbon metallurgy iron-making method adopting blast furnace gas carbon circulation, when the circulating amount of blast furnace top gas is insufficient, coke oven gas can be added into 2500m through a compressor and a gas pipeline 3 A furnace top decarburization gas circulation pipeline for blast furnace gas.
Through production practice, the raw materials are uniformly distributed by four raw materials of alkaline sinter ore, acidic pellet ore, alkaline or acidic green ore and scrap steel according to a certain proportion, wherein the raw materials comprise the following components in percentage by mass: the percentage by mass of the sintered ore is 75 percent of the total mass of the raw materials, the percentage by mass of the pellet ore is 15 percent of the total mass of the raw materials, the percentage by mass of the raw ore is 5 percent of the total mass of the raw materials, and the percentage by mass of the scrap steel is 5 percent of the total mass of the raw materials.
The amount of coal gas injected into the tuyere: 800 Nm 3 T iron;
the temperature of the tuyere injection gas is 850-950 ℃ (adjustable according to the furnace heat condition);
furnace bosh gas composition: h 2 ：17.41％CO：81.75％N 2 ：0.84％；
The amount of coal gas blown by the furnace body is as follows: 250 Nm 3 T iron;
the temperature of the coal gas injected into the furnace body is 1050-1200 ℃ (adjustable according to the thermal condition of the furnace);
the components of the furnace body gas: h 2 ：11.67％CO：87.49％N 2 ：0.84％；
The amount of steam-injected coal gas: 100kg/t iron;
oxygen consumption: 335m 3 T iron;
coke ratio: 273 kg/t iron;
the amount of gas in the furnace bosh: 1232m 3 /tHM；
Theoretical combustion temperature: 2085 deg.C;
the amount of the top gas: 1577m 3 /tHM；
The components of the top gas: h 2 ：10.11％CO：37.2％CO 2 ：44.55％ H 2 O：7.3％ N 2 ：0.84％。
Claims (1)
1. 2500m 3 The low-carbon ironmaking method of blast furnace gas carbon cycle is characterized by comprising the following steps:
1) The raw materials are evenly distributed by four raw materials of alkaline sinter ore, acidic pellet ore, alkaline or acidic raw ore and scrap steel according to a certain proportion, and the raw materials comprise the following components in percentage by mass: the percentage by mass of the sintered ore is 70-75 percent of the total mass of the raw materials, the percentage by mass of the pellet ore is 10-15 percent of the total mass of the raw materials, the percentage by mass of the raw ore is 3-5 percent of the total mass of the raw materials, the percentage by mass of the scrap steel is 3-5 percent of the total mass of the raw materials, and a ore layer is formed in the furnace; the coke and the coke pieces or the small coke pieces are uniformly mixed according to the proportion, wherein the coke consumption is 250-280 kg/t molten iron; the coke particles or the small coke are added according to the mass percentage of 2 to 4 percent of the coke mass to form a coke layer in the furnace;
2) Weighing raw fuel used by the blast furnace below the groove, charging and distributing equipment from the top of the blast furnace through a conveying belt, and alternately adding the raw fuel into the blast furnace from the top of the blast furnace according to the sequential batch circulation of a coke bed layer and a mineral layer, wherein the weight of the raw fuel is 2500m 3 The blast furnace adopts a platform and funnel distribution mode to ensure reasonable distribution of edge airflow and central airflow, the central airflow is stabilized by a funnel with the depth of 1.0-1.5m, stable and smooth edge airflow is obtained at the same time, a stockline is controlled to be 1.5-1.8m, and the iron ore is high-reducibility iron ore comprising alkaliThe comprehensive charging grade of the sexual sinter ore, the acidic pellet ore, the acid or alkaline raw ore and the steel scrap is more than 59.5 percent, and the charging grade of the steel scrap added is more than 59 percent;
3) The blast furnace adopts 90-99% of ultrahigh oxygen-enriched smelting, coke oven gas, european and metallurgical furnace decarbonized gas and 2500m 3 The 2500m technology for coupling various gas media in the blast furnace top gas circulation 3 The dust removal temperature of blast furnace top gas reaches 100-150 ℃, then the gas temperature is reduced to 40-45 ℃ by adopting a heat exchanger to meet the gas inlet temperature requirement of a decarburization device, and steam generated after heat exchange of the heat exchanger is merged into a steam pipe network for removing CO 2 The system heats the gas for use, and the gas at the top of the blast furnace is subjected to CO removal 2 Pressurizing to 0.55Mpa, heating the multiple coal gas media to 950-1200 deg.C by a coal gas heating furnace, and removing CO 2 Reducing CO in coal gas 2 The volume percentage content is less than 1 percent, and the volume percentage content is 2500m 3 Smelting by adopting 90-99% of ultrahigh oxygen enrichment at a blast furnace tuyere, injecting 950-1200 ℃ high-temperature mixed coal gas into the blast furnace, replacing solid fuel coal powder with the high-temperature mixed coal gas, simultaneously injecting one part of the high-temperature mixed coal gas from the blast furnace tuyere and injecting the other part of the high-temperature mixed coal gas from the lower part of a furnace body, and reducing the carbon quantity burnt in front of the tuyere by the high-temperature mixed coal gas;
4) The cold oxygen with the oxygen enrichment rate of 90-99 percent is sprayed from the tuyere, and the oxygen consumption of the pig iron is 300-500 Nm per 1t of smelting according to the adjustment of smelting parameters 3 The steam consumption is 50-100 kg, the water content in the gas is contained, and the mixed gas is 700-900 Nm 3 And spraying normal-temperature cold-state oxygen and the multiple coal gas media from the tuyere, and simultaneously adding steam to adjust the theoretical combustion temperature to 2000-2100 ℃.
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| CN114959154B (en) * | 2022-06-26 | 2023-05-05 | 新疆八一钢铁股份有限公司 | Material distribution method of shaft furnace of European smelting furnace |
| CN115354098B (en) * | 2022-08-15 | 2023-07-28 | 新疆八一钢铁股份有限公司 | Smelting method for plasma heating of hydrogen-rich carbon circulating blast furnace gas |
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