CN114636572B - Method for determining coal gas utilization rate of iron ore reduction process in blast furnace block area - Google Patents
Method for determining coal gas utilization rate of iron ore reduction process in blast furnace block area Download PDFInfo
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Abstract
The invention discloses an experimental method for researching the coal gas utilization rate of a blast furnace massive area iron ore reduction process, and belongs to the field of low-carbon metallurgy. The method specifically comprises the following steps: crushing and screening sinter ore, lump ore, pellets and coke, and filling a part with the diameter of 10-12.5 mm into a flexible metal furnace tube; heating a flexible metal furnace tube filled with iron-containing furnace burden in a constant-temperature electric furnace for 1h under inert protective atmosphere until the temperature of the iron-containing furnace burden is uniform, cutting off protective gas, and introducing reducing gas; and taking the reduction tail gas by adopting the gas bag when 125min is needed, carrying out component analysis for calculating the utilization rate of the gas, taking out the flexible metal furnace tube, cooling to room temperature, and carrying out characterization analysis on the reduced iron-containing furnace burden. The invention provides key basic parameters for theoretical analysis, design and development of a novel process for high oxygen-enriched gas circulation and hydrogen-enriched blast furnace low-carbon iron making.
Description
Technical Field
The invention belongs to the field of low-carbon metallurgy, and particularly relates to a method for determining the coal gas utilization rate in the reduction process of iron ore in a blast furnace lumpy zone.
Background
Reduction of CO with increasing global climate deterioration 2 Emissions for low carbon production have become a focus of global attention. Based on this, under the Paris agreement framework, the countries in the world make corresponding carbon emission reduction commitments, and the government in China also commits that the carbon emission reaches the peak value till 2030, and the unit GDPCO 2 The emission is reduced by 60-65% compared with 2005. The steel industry is a ridge beam of national economy of China, the yield of crude steel reaches 10.65 hundred million tons in 2020, the weight of the crude steel accounts for 56.7 percent of the global yield, and the steel industry is the first global. However, the mode of producing crude steel in China is mainly long-flow of a blast furnace and a converter, and the blast furnace iron making uses coke and coal as main energy sources (accounting for about 70% of the total energy consumption of the long-flow), so that the steel industry in China becomes a large consumer of energy consumption and pollutant discharge, and the carbon emission per year accounts for about 15% of the industrial emission and is far higher than the average level of 5-6% of the whole world. Therefore, the blast furnace ironmaking process inevitably becomes the main target of carbon emission reduction in the steel industry in China. At present, the development of the traditional blast furnace ironmaking technology in China is mature, and the technology is based on the production scaleThe factors such as economy, maturity and equipment layout can be expected to be the main equipment for ironmaking production in the future for a long time. No matter energy utilization or fuel consumption, the existing blast furnace iron-making technology is close to the limit, and only new technical breakthrough is found for continuous great carbon reduction.
In the blast furnace ironmaking production, the cyclic utilization of furnace top gas and the partial replacement of carbon by hydrogen are effective ways for greatly reducing the carbon emission at present. To address global warming, the ULCOS program was initiated in 2004 by the European Union as a high carbon emission intensity iron and steel industry actively to address the above challenges with the goal of achieving CO 2 And (5) reducing emission by 50%. ULCOS project 9m from LKAB, sweden, 2007 3 The test research of injecting the circulating coal gas in the hearth and the furnace body is carried out on the test blast furnace, the coal injection ratio of 170kg/tHM is kept unchanged, the coke ratio is reduced from 400-405 kg/tHM to 260-265 kg/tHM, and the carbon consumption is reduced by 24%. The COURSE50 program was initiated in 2008 in japan with the goal of achieving CO 2 Emission reduction is reduced by 30%, and the new-day iron-based Jinjunjin factory is built into 12m in 2015 and 9 months by relying on the plan 3 The blast furnace and the experimental research are carried out, three kinds of hydrogen-rich gas including coke oven gas, reformed coke oven gas and heated furnace top circulating gas are respectively sprayed at the air port at the lower part of the furnace body, and the aim of reducing the emission by 10 percent by replacing carbon with hydrogen is fulfilled. In 2018, 1 month, a German Tisson Krupp steelworks sprays hydrogen into a blast furnace, and a hydrogen-substituted coal test is carried out for the first time in the world, so that the CO is reduced by 20 percent 2 And (5) discharging.
The blast furnace gas moves upwards from the tuyere area of the furnace hearth to contact with the descending furnace burden, and the heat energy and the chemical energy of the gas are transmitted to the furnace burden to finish the smelting process. The heat energy and the chemical energy carried by the gas flow complete momentum and heat mass transfer in the reverse movement with the solid charging and the liquid slag iron, and the transfer processes determine the utilization efficiency of the chemical energy and the heat energy of the gas, so that the coke ratio, the fuel ratio and other indexes required by blast furnace iron making are influenced, and the production cost of blast furnace molten iron is influenced. Gas utilization (i.e. CO) based on production experience 2 /(CO+CO 2 ) X 100%) and the coke ratio is reduced by 1.2% every time the coke ratio is increased by 1%, so the significance of improving the coal gas utilization rate in the blast furnace production practice is very important.The coal gas utilization rate represents the energy consumption level of the blast furnace, the reasonability of air flow distribution and the running state of the blast furnace to a certain extent. However, the blast furnace ironmaking process is similar to a black box, with the complexity of thermodynamic and kinetic coupling, and particularly after the introduction of hydrogen, the reaction system becomes more complex. These characteristics of blast furnaces have led researchers to be unable to obtain accurate values of gas utilization rate when studying a novel blast furnace iron-making process characterized by gas utilization regulation, and to be able to use only existing empirical data, thereby affecting accurate theoretical analysis and process design of the new process.
In addition, the steel industry is a backbone industry of China, but is also an industry with high energy consumption and high emission, and the nation promotes carbon peaking and carbon neutralization of the steel industry in order to deal with global warming while promoting ultralow emission modification of the steel industry. Considering that more than 90 percent of crude steel is produced by a long flow of a blast furnace-converter and the service time of equipment in China at present, the working gravity center of the carbon-reaching stage and the early carbon-reducing stage after the carbon-reaching stage is the blast furnace iron-making process. The blast furnace ironmaking process has mature technology, large production capacity and high thermal efficiency (up to 95 percent), no process can replace the blast furnace to support the huge demand of China on steel materials in the coming decades, and the blast furnace still remains the mainstream equipment for ironmaking in the steel production process in China. Therefore, the research on the low-carbon ironmaking process based on the blast furnace is significant. The blast furnace ironmaking process can produce a large amount of blast furnace gas, and is limited by the thermodynamic balance of iron oxide reduction and insufficient physical heat on the upper part of a furnace body, the utilization rate of CO in the blast furnace gas is generally 50%, about 20% of CO is still contained in the gas, the chemical energy taken away by the CO accounts for about 35% of the total energy consumption (the total energy of actually converted coal and coke) of iron, the CO should be recycled for reduction in the furnace, and the self-produced coke oven gas, natural gas or green hydrogen of an enterprise can be used for blast furnace injection, so that the use of high-carbon fossil fuels such as coal, coke and the like is reduced. Therefore, after the top gas is circularly injected or hydrogen-rich gas is injected, the reduction potential in the furnace is improved, and the components of the reducing gas in the furnace, the generation of the thermal mass and the matching mode are changed, so that the smelting process of the ore is different, and the utilization rate of the gas is further influenced. In general, in order to explore technical and economic indexes of a new blast furnace iron-making process in advance, material balance and heat balance calculation of the new process can be carried out, wherein one key parameter is the utilization rate of coal gas, and the parameter can influence the heat consumption and reducing gas consumption in a furnace, and further influence the accurate calculation of blast furnace coal and coke consumption and top coal gas components. The existing theoretical calculation formula and prediction model can only analyze the utilization rate of the top gas of the existing production blast furnace, and the change rule of the utilization rate of the top gas under the new process of high oxygen-enriched gas circulation and hydrogen-enriched blast furnace low-carbon iron-making is difficult to accurately obtain.
Disclosure of Invention
In view of the above problems, the present invention aims to find a technically feasible method for obtaining a coal gas utilization rate change rule of a lump region iron ore reduction process under the conditions of novel high oxygen-enriched coal gas circulation and hydrogen-enriched blast furnace ironmaking process, and provide a reference for the development of a novel ironmaking process. The invention adopts a thermal state experiment simulation method, adopts furnace burden used in actual blast furnace ironmaking, controls reasonable temperature interval close to actual blast furnace production, and obtains the value of the utilization rate of the top gas under corresponding process conditions at a proper reduction end point by introducing different coal gases which are composed differently and simulate different ironmaking processes. Furthermore, the influence of different coal gas components on the utilization rate of the furnace top coal gas can be inspected, and the reduction state of the charge column can be analyzed.
According to a first aspect of the technical scheme, the invention provides a method for determining the coal gas utilization rate of a blast furnace lump area iron ore reduction process, which is characterized in that the method is used for analyzing the coal gas utilization rate of the lump area iron ore reduction process under the conditions of novel high oxygen-enriched coal gas circulation and hydrogen-enriched blast furnace ironmaking process, and the method specifically comprises the following steps:
step (1): crushing and screening sinter ore, lump ore, pellets and coke, and filling a part with the diameter of 10-12.5 mm into a flexible metal furnace tube;
step (2): heating a flexible metal furnace tube filled with iron-containing furnace charge in a constant-temperature electric furnace for 1h under inert protective atmosphere until the temperature of the iron-containing furnace charge is uniform, cutting off protective gas, and introducing reducing gas;
and (3): and (4) taking the reduction tail gas by adopting the gas bag when 125min is needed, carrying out component analysis for calculating the utilization rate of the gas, taking out the flexible metal furnace tube, cooling to room temperature, and carrying out characterization analysis on the reduced iron-containing furnace burden.
Further, in the step (1), the flexible metal furnace tube is a high-temperature alloy tube and can resist the high temperature of over 1100 ℃ in the reducing atmosphere. Here, the flexible metal furnace tube is composed of a rigid high-temperature alloy metal furnace tube and an inner sleeve high-temperature resistant metal mesh, and a furnace charge is placed in the mesh and a certain free shrinkage space is reserved, because: generally, iron-containing charges undergo a volume expansion of around 20% during the reduction process, and some charges undergo an even greater degree of malignant volume expansion. In the experimental process, if the rigid high-temperature alloy metal furnace tube is directly used for reduction experiment, the furnace charge subjected to reduction expansion can be blocked in the tube and even cause the deformation of the furnace tube, so that the experiment can not be carried out and even danger is caused.
Further, in the step (1), the inner diameter of the flexible metal furnace tube is 7-9 cm, the height of the furnace tube is 80-100 cm, a layer of metal mesh is nested in the furnace tube, the metal mesh and the inner wall of the furnace tube are separated by a free space of 2-5 mm, and iron-containing furnace burden is placed in the metal mesh. The free space between the metal mesh and the inner wall of the furnace tube is 2-5 mm, so that the experiment is carried out smoothly, and the experimental result shows that the design is very successful and meaningful. In addition, the design of the flexible metal reduction furnace tube is designed and applied for the first time by the technical scheme of the invention, and has originality.
Further, in the step (2), the temperature of the end of the flexible metal furnace tube where the reducing gas is introduced is set to 1100 ℃, and the temperature of the end of the flexible metal furnace tube where the reducing tail gas is discharged is set to 300 ℃. Here, the two temperatures are set according to actual conditions of blast furnace iron making. The temperature of 300 ℃ is the simulated furnace top temperature (200-400 ℃), namely the temperature of the coal gas leaving the furnace charge, so the temperature of the furnace charge at one end discharging the reduction tail gas in the technical scheme of the invention is set to be 300 ℃. The technical scheme of the invention is mainly to simulate the gas-solid reaction of the blast furnace block-shaped area, the furnace burden begins to soften at the temperature of over 1100 ℃ generally below the temperature of the blast furnace block-shaped area, and CO2 and H2O at the temperature of over 1100 ℃ can react with coke and can not exist in coal gas, so that the coal gas only contains CO, H2 and N2. Therefore, in the present invention, the temperature range of the bulk region is set to 1100 to 300 ℃.
Further, in the step (2), the reducing gas is blast furnace gas, and the concentration ranges of the components are 20% -90% of CO concentration and H concentration 2 Concentration 0% -30%, N 2 The concentration is 10-80%.
Further, in the step (2), when H is contained in the blast furnace gas 2 When the concentration exceeds 5%, a condensation dewatering device is required to be arranged at the outlet of the reduction tail gas. Here, it is at H 2 When the concentration exceeds 5%, a condensation water removal device is arranged, because: the iron oxide is reduced by hydrogen to generate water, the water exists in tail gas in the form of water vapor, if a condensation dewatering device is not arranged, when the concentration of hydrogen in the reducing gas is high, the proportion of the water vapor generated by reduction in the tail gas is also high, excessive water vapor is condensed on the inner wall surface of a tail gas conveying pipeline outside the furnace and gradually accumulated along with the reduction process, and finally, the pipeline is blocked, the exhaust of the tail gas is influenced, so that the experiment cannot be continued. According to multiple experimental researches, the method discovers that H in blast furnace gas 2 When the concentration exceeds 5%, a condensation and water removal device must be arranged.
Further, the 125min reduction time is determined according to the coal gas composition of the hearth of the simulated common blast furnace introduced by the reduction pipe and when the utilization rate of CO reaches 50%.
Further, in the step (1), the charging amount of the iron-containing burden composed of the sintered ore, the lump ore and the pellets was 3kg, and the charging amount of the coke was 0.5kg. Here, the mass ratio of the ore and the coke is determined according to the actual material ratio of the ironmaking process.
Further, in the step (2), the flow rate of the reducing gas is 10L/min. Here, the values of the reduction flow rate and the time are set to simulate the smelting conditions of the blast furnace in experimental studies so that the state of the charge in the experiments may reach the actual state of the blast furnace. The 'gas flow rate' is determined according to the actual conditions of blast furnace ironmaking, namely the gas amount required by unit mass ore smelting, and the mass (3 kg) of the raw materials used in the experiment. The reduction time is determined according to the time when the gas utilization rate under the condition of simulating common gas in an experiment is close to the actual furnace top gas utilization rate of the blast furnace body part, namely: the reduction pipe is filled with gas simulating the coal gas component of the common blast furnace belly and the time when the utilization rate of CO reaches 50 percent.
According to a second aspect of the technical scheme of the invention, the system for determining the coal gas utilization rate in the iron ore reduction process of the blast furnace lumpy zone is characterized by comprising the following steps:
the flexible metal furnace tube comprises a reducing gas inlet end and a reducing tail gas outlet end, and iron-containing furnace burden and coke are filled in the flexible metal furnace tube;
the resistance furnace is arranged outside the flexible metal furnace tube, the temperature of the reducing gas inlet end close to the flexible metal furnace tube is 1100 ℃, and the temperature of the reducing tail gas outlet end close to the flexible metal furnace tube is set to be 300 ℃;
and the component analysis device is communicated with the reduced tail gas discharge end of the flexible metal furnace tube and is used for carrying out component analysis on the reduced tail gas so as to calculate the utilization rate of the coal gas.
In summary, compared with the existing method, the invention has the following progress and innovative effects:
the utilization rate of top gas is a key basic parameter for developing novel blast furnace ironmaking process, especially for CO and H in the gas at the furnace hearth 2 In the case of a large increase in concentration, the determination of this parameter is more important. Although the existing theoretical calculation formula and the prediction model based on metallurgical mechanism and big data analysis can obtain the utilization rate of the top gas of the existing production blast furnace, the iron ore reduction in the actual blast furnace block area is a complex coupling process of thermodynamic equilibrium and dynamic evolution of a plurality of chemical reactions, and the new ironmaking process has no historical production data to refer to, so that the utilization rate of the top gas under the new processes of high oxygen-enriched gas circulation and hydrogen-enriched blast furnace low-carbon ironmaking is difficult to accurately obtain by the existing research means. The invention obtains the coal gas utilization rate which gives consideration to thermodynamic and kinetic factors and is closer to the actual smelting condition of the novel iron-making process through an experimental method, thereby realizing high oxygen-enriched coal gas circulation, hydrogen enrichment and high hydrogen enrichmentTheoretical analysis and design development of the novel furnace low-carbon ironmaking process provide key basic parameters.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
FIG. 1 is a schematic diagram of an experimental apparatus and process according to the technical solution of the present invention.
Detailed Description
In order to more clearly illustrate the embodiments or technical solutions of the present invention, the drawings used in the embodiments or technical solutions of the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
According to the technical scheme of the invention, the method for determining the coal gas utilization rate in the iron ore reduction process of the blast furnace block-shaped area is provided, as shown in figure 1, the method is realized by depending on the following experimental structure:
the flexible metal furnace tube comprises a reducing gas inlet end and a reducing tail gas outlet end, and iron-containing furnace charge and coke are filled in the flexible metal furnace tube;
the resistance furnace is arranged outside the flexible metal furnace tube, the temperature of the reducing gas inlet end close to the flexible metal furnace tube is 1100 ℃, and the temperature of the reducing tail gas outlet end close to the flexible metal furnace tube is set to be 300 ℃;
and the component analysis device is communicated with the reduction tail gas discharge end of the flexible metal furnace tube and is used for carrying out component analysis on the reduction tail gas, so that the coal gas utilization rate is calculated.
The method comprises the following main process flows:
(1) Crushing and screening sintered ore, lump ore, pellets and coke, and filling the part with the diameter range of 10-12.5 mm into a flexible metal furnace tube;
(2) Heating the metal furnace tube filled with the material in a constant-temperature electric furnace for 1h under inert protective atmosphere until the temperature of the material is uniform, cutting off protective gas, and introducing reducing gas;
(3) And taking the reduction tail gas by adopting the gas taking bag when 125min is needed, carrying out component analysis for calculating the gas utilization rate, taking the furnace tube out, cooling to room temperature, and carrying out characterization analysis on the reduced furnace charge.
The method can obtain the change rule of the coal gas utilization rate in the reduction process of the blocky iron ore in the high oxygen-enriched coal gas circulation and hydrogen-enriched blast furnace ironmaking process through laboratory experiments. By changing the components of the reducing gas, the components of the furnace belly gas under different conditions of high oxygen-enriched gas circulation and hydrogen-enriched blast furnace ironmaking process can be simulated, so that the corresponding gas utilization rate is obtained. Compared with the online analysis of the blast furnace top gas of the iron and steel enterprises and the analysis of the utilization rate of the blast furnace top gas of the existing production only by a prediction model based on metallurgical mechanism and historical data, the invention can obtain the utilization rate of the gas which gives consideration to thermodynamic and kinetic factors and is closer to the actual smelting conditions of the novel iron-making process by a low-cost and simple experimental method, thereby providing key basic parameters for the theoretical analysis and the design development of the novel process of high oxygen-enriched gas circulation and hydrogen-enriched low-carbon iron-making of the blast furnace.
Example 1
The sintered ore, lump ore, pellets and coke are crushed and sieved, and 10-12.5 mm of part of the crushed sintered ore, lump ore, pellets and coke is loaded into a flexible metal furnace tube, wherein the loading amount of iron-containing furnace burden is 3kg, and the loading amount of coke is 0.5kg. Heating the metal furnace tube filled with the material in a constant temperature electric furnace under inert atmosphere for 1h to make the bottom temperature of the material 1100 deg.C and the top temperature of the material 300 deg.C, cutting off the protective gas, introducing reducing gas, the reducing gas has a composition of 40% CO, 60% N 2 Simulating the components of the coal gas of the bosh of a common blast furnace, taking the gas for analyzing CO and CO when the flow of the reducing gas is 10L/min and the reducing time is 125min 2 The concentration of the gas is respectively 20.22 percent and 19.77 percent, and the utilization rate of CO (CO) in the top gas can be calculated 2 /(CO+CO 2 ) X 100%) was 49.4%.
Example 2
The sintered ore, lump ore, pellets and coke are crushed and sieved, and 10-12.5 mm of part of the crushed sintered ore, lump ore, pellets and coke is loaded into a flexible metal furnace tube, wherein the loading amount of iron-containing furnace burden is 3kg, and the loading amount of coke is 0.5kg. Heating the metal furnace tube filled with the material in a constant temperature electric furnace under inert protective atmosphere for 1h to make the bottom temperature of the material 1100 deg.C and the top temperature of the material 300 deg.C, cutting off the protective gas, introducing reducing gas with composition of 10% 2 、30％CO、60％N 2 Simulating the components of the coal gas of the bosh of the hydrogen-rich blowing blast furnace, taking the gas for analysis H when the flow of the reducing gas is 10L/min and the reducing time is 125min 2 、CO、CO 2 、N 2 The concentrations of (A) are 6.60%, 15.16%, 17.60%, 60.64%, respectively, in terms of N 2 The conservation of flow can calculate H 2 The utilization rate (CO) of CO in the top gas can be calculated 2 /(CO+CO 2 ) X 100%) is 53.7%, H 2 Utilization rate (H) 2 O/(H 2 +H 2 O) × 100%) was 34.6%.
Example 3
The sintered ore, lump ore, pellets and coke are crushed and sieved, 10-12.5 mm of parts are loaded into a flexible metal furnace tube, the loading amount of iron-containing furnace burden is 3kg, and the loading amount of coke is 0.5kg. Heating the metal furnace tube filled with the material in a constant temperature electric furnace under inert atmosphere for 1h to make the bottom temperature of the material 1100 deg.C and the top temperature of the material 300 deg.C, cutting off the protective gas, introducing reducing gas, the reducing gas has a composition of 80% CO, 20% N 2 Simulating the components of the gas in the furnace chamber of the blast furnace circularly blown by the high oxygen-enriched gas, taking the gas for analyzing CO and CO when the flow of the reducing gas is 10L/min and the reducing time is 125min 2 The concentration of the gas is respectively 53.04 percent and 26.96 percent, and the utilization rate of CO (CO) in the top gas can be calculated 2 /(CO+CO 2 ) X 100%) was 33.7%.
While the present invention has been described with reference to the embodiments shown in the drawings, the present invention is not limited to the embodiments, which are illustrative and not restrictive, and it will be apparent to those skilled in the art that various changes and modifications can be made therein without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (5)
1. A method for determining the coal gas utilization rate of a blast furnace block region iron ore reduction process is characterized by being used for analyzing the coal gas utilization rate of the block region iron ore reduction process under the conditions of high oxygen-enriched coal gas circulation and hydrogen-enriched blast furnace ironmaking process, and specifically comprising the following steps of:
step (1): crushing and screening sintered ores, lump ores, pellets and coke, and filling a part with the diameter of 10-12.5 mm into a flexible metal furnace tube, wherein the flexible metal furnace tube is a high-temperature alloy tube and can resist the high temperature of over 1100 ℃ in a reducing atmosphere; the inner diameter of the flexible metal furnace tube is 7 cm-9 cm, the height of the furnace tube is 80 cm-100 cm, a layer of metal mesh is nested in the furnace tube, the metal mesh and the inner wall of the furnace tube are separated by a free space of 2 mm-5 mm, and iron-containing furnace burden is placed in the metal mesh;
step (2): heating a flexible metal furnace tube filled with iron-containing furnace charge in a constant-temperature electric furnace for 1h under inert protective atmosphere until the temperature of the iron-containing furnace charge is uniform, cutting off protective gas, and introducing reducing gas, wherein the temperature of one end of the flexible metal furnace tube, which is introduced with the reducing gas, is set to be 1100 ℃, and the temperature of one end of the flexible metal furnace tube, which discharges the reducing tail gas, is set to be 300 ℃;
and (3): and (2) taking the reduction tail gas by adopting a gas bag when the time is 125min, carrying out component analysis for calculating the utilization rate of the gas, simultaneously taking out the flexible metal furnace tube, cooling to room temperature, and carrying out characterization analysis on the reduced iron-containing furnace burden, wherein the reduction time of 125min is determined according to the gas components of the simulated ordinary blast furnace belly introduced into the reduction tube and when the utilization rate of CO reaches 50%.
2. The method for determining the gas utilization rate in the iron ore reduction process of the blast furnace lumpy zone according to claim 1, wherein: in the step (2), the concentration ranges of all components of the reducing gas are 20% -90% of CO concentration and H 2 Concentration 0% -30%, N 2 The concentration is 10-80%.
3. The method for determining the gas utilization rate in the iron ore reduction process of the blast furnace lumpy zone according to claim 2, wherein: in the step (2), when H is contained in the blast furnace gas 2 When the concentration exceeds 5%, a condensation dewatering device is required to be arranged at the outlet of the reduction tail gas.
4. The method for determining the coal gas utilization rate in the iron ore reduction process of the blast furnace lumpy zone according to claim 1, wherein: in the step (1), the charging amount of iron-containing furnace burden composed of sintered ore, lump ore and pellets is 3kg, and the charging amount of coke is 0.5kg.
5. The method for determining the gas utilization rate in the iron ore reduction process of the blast furnace lumpy zone according to claim 1, wherein: in the step (2), the flow rate of the reducing gas is 10L/min.
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