CN114058749A - Method for researching degradation of smokeless lump coal in blast furnace - Google Patents
Method for researching degradation of smokeless lump coal in blast furnace Download PDFInfo
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Abstract
The invention aims to provide a method for researching the degradation of smokeless lump coal in a blast furnace, which belongs to the field of blast furnace ironmaking production and comprises the following steps: step one, carrying out particle size screening, component analysis and physical and chemical property measurement on lump coal entering a furnace, and selecting lump coal meeting conditions; step two, mixing lump coal and dry coke in a mass ratio of 1: 100-1: 20 in each batch to form a mixture; and step three, the mixture is put into a storage bin and then distributed into the blast furnace through a belt, a charging bucket and a chute. According to the invention, by adding the lump coal into the ore layer, on the premise of ensuring the stable and smooth operation of the blast furnace, the dry coke ratio and the coal injection ratio in the furnace are reduced, the iron-making production cost of the blast furnace is reduced, and the economic index of blast furnace production is improved.
Description
Technical Field
The invention belongs to the field of blast furnace ironmaking production, and particularly relates to a method for researching the degradation of smokeless lump coal in a blast furnace.
Background
Coal is the main energy in China, accounts for about 60% of primary energy consumption, and is an important energy guarantee for the economic and social development of China. The coking coal is the basic energy and main raw material of the steel industry, and guarantees the development of the steel industry in China, but the coking coal only accounts for about one fifth of the reserves of the coal resources in China, and the high-quality main coking coal and fat coal only account for 3 percent, and are particularly rare. At present, the steel production capacity is huge, and the coke consumption is very large, so the situation of resource shortage of high-quality coking coal is increasingly aggravated.
Anthracite is a hard, dense and high-gloss coal with the highest carbon content, the lowest impurity content and the highest coalification degree. The smokeless lump coal has high fixed carbon content, low volatile matter and ash content, low content of harmful elements such as phosphorus, sulfur and the like, and simultaneously has high density, high hardness and high compressive strength. The reactivity of the anthracite is slightly lower than that of coke, the anthracite can keep a blocky shape at and above the position of a blast furnace reflow zone, and has certain compressive strength, so that the air permeability of a material column at the position above the blast furnace reflow zone can be ensured, the reduction potential around the iron-containing furnace burden is increased, and the reduction efficiency of the iron-containing furnace burden is increased.
Compared with coke, the smokeless lump coal has the advantages of low cost and small pollution, and meanwhile, the smokeless lump coal has certain reactivity and can replace part of coke dices and iron-containing furnace burden to be mixed and fed into a furnace for blast furnace production. The smokeless lump coal is applied to blast furnace production, so that on one hand, the coke consumption can be reduced, the condition of resource shortage of high-quality coking coal is relieved, and the production cost of enterprises is reduced; on the other hand, the method can reduce pollution and discharge caused by coking and protect the environment.
Disclosure of Invention
The invention aims to provide a method for researching the deterioration of smokeless lump coal in a blast furnace, which is used for researching the deterioration process of the smokeless lump coal in the blast furnace.
The invention adopts the following technical scheme:
a method for researching the deterioration of smokeless lump coal in a blast furnace comprises the following steps:
step (1), based on blast furnace design parameters, basic metallurgical performance of the smokeless lump coal and blast furnace operating parameters, adopting EDEM simulation software for modeling and numerical simulation to generate the change of the maximum compressive stress of the smokeless lump coal in the blast furnace under a certain cross section of a stock column along with the height of the stock column; thereby obtaining the corresponding relation between the height value of the furnace charge column and the EDEM simulated pressure value of the furnace charge column at the corresponding height.
The design parameters of the blast furnace comprise effective volume, effective height, hearth diameter, hearth height, furnace belly angle, furnace body angle, furnace waist diameter, furnace throat diameter and furnace type size of the blast furnace.
The basic performance of the smokeless lump coal comprises the components and the particle size distribution of the smokeless lump coal.
The blast furnace operation parameters comprise yield, the amount of the smokeless lump coal charged into the blast furnace per ton of iron, coal ratio, coke ratio, fuel ratio, smelting strength, pig iron qualification rate, oxygen enrichment rate, stockline, ore batch and coke batch.
The blast furnace can be simulated based on the parameters by adopting EDEM simulation software for modeling.
The atmosphere in the blast furnace comprises CO and CO2、N2、H2And H2O。
And (2) aiming at a plurality of EDEM simulation height values of the fuel material column, acquiring EDEM simulation temperature values corresponding to the simulation height values, performing a simulated blast furnace experiment on the smokeless lump coal in the programmed reduction furnace, simulating the atmosphere and the temperature rise system of the blast furnace, sampling and analyzing the metallurgical performance of the smokeless lump coal after the experiment is finished, and establishing a corresponding relation between the temperature values of the smokeless lump coal under the simulation height values and the metallurgical performance numerical values of the smokeless lump coal. The metallurgical performance values comprise the thermal bursting performance of the smokeless lump coal, the reactivity of the smokeless lump coal, the strength of the smokeless lump coal after reaction, the wear-resisting strength of the smokeless lump coal after reaction, the high-temperature compressive strength of the smokeless lump coal, the dissolution loss reaction degree of the smokeless lump coal, the interaction between the smokeless lump coal and coke, the XRD, SEM and RAMAN detection and analysis of the smokeless lump coal.
The thermal decrepitation performance of the smokeless lump coal is the phenomenon that the smokeless lump coal is broken due to the action of thermal stress in the temperature rising process after being added into a blast furnace. The method comprises the steps of preparing the smokeless lump coal into particles with the particle sizes of 10-20mm and 20-35mm, respectively putting the particles into a corundum crucible, putting the corundum crucible into a muffle furnace at room temperature, simulating the temperature rise speed of a bulk material layer of the blast furnace, setting the temperature rise speed of the muffle furnace to be 5 ℃/min, respectively raising the temperature to 300 ℃, 400 ℃, 500 ℃ and 600 ℃, keeping the temperature for 30min after the set temperature is reached, and then cooling the particles to the room temperature along with the furnace. After the experiment is finished, the smokeless lump coal is taken out for screening and weighing, and the ratio of the coal mass in different particle size ranges after roasting to the total mass of the coal after reaction is calculated, namely the thermal explosion index, so that the thermal explosion performance can be represented. By referring to a method for measuring the thermal explosion index of the iron ore, the part of the smokeless lump coal with the granularity less than 3.15mm is screened out, and the ratio of the smokeless lump coal to the total mass of the reacted coal is calculated. The thermal burst index (DI) was calculated according to the following formula-3.15) (in mass percent): DI-3.15=（m2*100）/m1In the formula: m is1Represents the mass of the sample after heat treatment, g; m is2Representing the mass, g, of the anthracite block coal having a particle size of less than 3.15mm after screening.
The reactivity of the anthracite briquettes refers to the ability of the anthracite briquettes to chemically react with carbon dioxide, water vapor, and the like. The strength of the reacted anthracite is the capability of the reacted anthracite to resist fragmentation and abrasion under the action of mechanical force and thermal stress. According to GB/T4000-2017, the smokeless lump coal is prepared into the grain size of 23-25mm and 200 g, the smokeless lump coal is put into a programmed reduction furnace at room temperature, the temperature is increased to 1100 ℃ at the speed of 10 ℃/min, and N with the flow rate of 2L/min is introduced in the temperature increasing stage2Protection, keeping the temperature at 1100 ℃ for 10min in nitrogen atmosphere, and introducing CO with the flow rate of 5L/min2The reaction was carried out at constant temperature for 2 hours. After the reaction, the reaction mixture was cooled to room temperature under a nitrogen atmosphere, and the sample was placedIn a type I rotary drum, the speed is changed to 30min under the condition of 20r/min, the total speed is 600 revolutions, and finally, the weight is respectively weighed according to the sieve of a 10mm round hole sieve. The reactivity is expressed by the mass fraction of the sample after reaction before the reaction, and the strength after the reaction is expressed by the mass fraction of the sample more than 10mm after the reaction, and the calculation formula is as follows:
reactivity = (mass after reaction)/(mass before reaction) × 100%;
post-reaction strength = (particle diameter after drum is greater than 10mm mass)/(post-reaction mass) × 100%.
In the process of the smokeless lump coal moving from top to bottom in the blast furnace, a series of deterioration reactions occur, so that the particle size is reduced, and powder is generated. After the smokeless lump coal is subjected to simulated blast furnace experimental reaction, screening out different granularities from a sample, calculating the proportion of coal with different granularities, checking the granularity distribution of the smokeless lump coal in the blast furnace, and calculating the wear-resisting strength M after the reaction5The calculation formula is as follows:
M5=（m3×100）/m4in the formula, m3Represents a mass with a particle size of less than 5mm, g; m is4Represents the total mass after reaction, g.
The high-temperature compressive strength of the anthracite block coal is an important property of the blast furnace raw material, and whether the blast furnace runs smoothly or not is determined. The high-temperature compressive strength is low, and the high-temperature compressive strength is easy to crack in the top-down movement process of the blast furnace, so that small-particle-size particles are generated, the gas permeability of the blast furnace is adversely affected, the distribution of gas flow is affected, and the blast furnace is not favorable for smooth operation. Selecting smokeless lump coal with different particle sizes to simulate the blast furnace atmosphere and the temperature rise system in a high-temperature pressure resistant machine, and respectively measuring the high-temperature pressure resistant values at different temperatures, wherein the calculation formula of the pressure resistant strength sigma is as follows:
σ = (2P)/(pi dl), where σ represents compressive strength, GPa; p represents pressure, N; d represents the diameter of the lump coal sample, mm; l represents the length of the lump coal sample in mm.
The interaction of the anthracite coal with the coke is an important chemical interaction within the blast furnace. The smokeless lump coal can replace part of coke breeze in actual production, and reduce the consumption of carbon melting loss reaction of blast furnace coke, thereby achieving the effect of reducing coke ratio. The coke is crushed into pieces of 23-25mm and 100 g. Smokeless lump coalCrushing into 10-20mm and 20-30mm, each group is 100 g. The coke is respectively and uniformly mixed with 10-20mm and 20-30mm smokeless lump coal. 100 g of smokeless lump coal and coke are respectively placed in a programmed reduction furnace, the temperature is increased from room temperature to 1100 ℃ at the temperature increase rate of 5 ℃/min under the protection of nitrogen atmosphere, and the temperature increase stage N is carried out2The flow rate is 2L/min to prevent the coal from burning, damaging and oxidizing. When the temperature of the material layer reaches 1100 ℃, cutting off nitrogen and introducing CO2，CO2The flow rate is 5L/min, and the reaction is carried out for 2 hours at constant temperature. After carbon dioxide is introduced, the temperature of the material layer is kept at 1100 ℃ within 5-10 min. After the reaction is finished, the temperature is reduced to room temperature under the protection of a nitrogen atmosphere. After the experiment, the sample is taken out, coke and lump coal are separated out, and the coke and the lump coal are respectively weighed. The reaction rate of coke and lump coal was calculated.
The chemical reactions mainly occurring in the blast furnace for the smokeless lump coal are as follows: c + CO2=2CO, the organization structure, phase composition and surface morphology of the smokeless lump coal are changed after the smokeless lump coal is eroded by the dissolution loss of carbon dioxide, thermal stress, mechanical force and the like. Crushing the anthracite block coal into particles with the particle diameter of 16-20mm, putting the particles into a programmed reduction furnace, and introducing N with the flow rate of 2L/min2Protecting, heating to 1100 deg.C at a heating rate of 10 deg.C/min, closing nitrogen gas, and introducing CO at flow rate of 5L/min2And reacting at constant temperature for 2 hours, and performing SEM, XRD and Raman detection analysis on the reacted sample.
The program reduction furnace is a high-temperature energy-saving vertical tubular furnace, a balance is horizontally arranged at the upper part of the tubular furnace, the similar real-time reaction sample weightlessness reaction rate is used, reducing gas is introduced at the lower part of the tubular furnace, and the carbon dissolution loss reaction of the smokeless lump coal in the blast furnace atmosphere is inspected; a heating element in the furnace adopts a silicon-molybdenum rod, and a furnace shell is cooled by cooling water; the maximum temperature of the tubular furnace is 1700 ℃, and the maximum heating rate can reach 15 ℃/min. The working voltage is 220V/50Hz, and the maximum power is 140 KW; the gas flow is 5L/min, and nitrogen cooling is switched to be performed after the experiment is finished until the temperature of the furnace body is reduced to the room temperature. The muffle furnace is a box-type muffle furnace capable of rapidly heating at 1600 ℃, and the high-temperature pressure-resistant machine is an MJDW-10B type electronic universal testing machine produced by Jinan Mijie company and mainly comprises a testing machine body and a computer for data acquisition.
And (3) mapping and associating the maximum compressive stress borne by the smokeless lump coal obtained in the step (1) in the material column with the change of the height of the material column and the corresponding relation between the temperature value of the smokeless lump coal obtained in the step (2) and the metallurgical performance numerical value of the smokeless lump coal to obtain the top-down degradation process of the smokeless lump coal after entering the blast furnace from the top of the blast furnace.
The method for researching the degradation of the smokeless lump coal in the blast furnace comprises the metallurgical performance degradation processes of the smokeless lump coal from a feeding port at the top of the blast furnace to the lower part of a blast furnace soft melting belt at different heights, the reactivity of the smokeless lump coal, the strength of the smokeless lump coal after reaction, the wear-resisting strength of the smokeless lump coal after reaction, the dissolution loss reaction degree of the smokeless lump coal, the high-temperature compressive strength of the smokeless lump coal and the interaction of the smokeless lump coal and coke.
The invention has the following beneficial effects:
the invention considers the mapping relation of displacement, temperature, pressure and atmosphere of the smokeless lump coal in the top-down movement process of the smokeless lump coal in a blast furnace, analyzes the change of metallurgical properties (thermal explosion performance of the smokeless lump coal, reactivity of the smokeless lump coal, strength after reaction of the smokeless lump coal, wear-resisting strength after reaction of the smokeless lump coal, high-temperature compressive strength of the smokeless lump coal, dissolution loss reaction degree of the smokeless lump coal and interaction of the smokeless lump coal and coke) of the smokeless lump coal in the descending process of the blast furnace, and provides a complete degradation research method of the smokeless lump coal in the blast furnace.
The invention can carry out system analysis aiming at the performance evolution of other types of blocky solid fuels (such as carbon-containing briquettes, iron coke and blocky semi coke) in the blast furnace, is beneficial to carrying out scientific recommendation on the addition proportion and the use mode of the blocky solid fuels, optimizes other fuels to the maximum extent on the basis of ensuring the stable sequence of the blast furnace, reduces the coke ratio of the blast furnace to the maximum extent and improves the smelting intensity of the blast furnace. The method grasps the deterioration process of the smokeless lump coal in the blast furnace and provides important guiding significance for the addition of the smokeless lump coal to the blast furnace.
Drawings
FIG. 1 is a schematic diagram of the technical scheme of the present invention.
Figure 2 is the interaction of anthracite coal with coke.
FIG. 3 is SEM of structure appearance after the dissolution loss reaction of the anthracite block coal, wherein (a) and (b) are original surface appearance of the anthracite block coal, and (c) and (d) are surface appearance of the anthracite block coal after the carbon dissolution loss reaction.
Fig. 4 is a RAMAN peak fit curve for anthracite briquettes, (a) representing 20% anthracite briquettes, and (b) representing 30% anthracite briquettes.
Figure 5 is a XRD diffractogram of anthracite.
FIG. 6 is a graph of the height of the burden column of the burden in the blast furnace versus the maximum compressive stress.
Detailed Description
A method for researching the deterioration of smokeless lump coal in a blast furnace comprises the following steps:
the method comprises the following steps of firstly, based on blast furnace design parameters, basic metallurgical performance of the smokeless lump coal and blast furnace operation parameters, adopting EDEM simulation software for modeling and numerical simulation to generate the change of the maximum compressive stress of the smokeless lump coal in the blast furnace under a certain cross section of a stock column along with the height of the stock column; thereby obtaining the corresponding relation between the height value of the furnace charge column and the EDEM simulated pressure value of the furnace charge column at the corresponding height; the design parameters of the blast furnace comprise effective volume, effective height, hearth diameter, hearth height, furnace belly angle, furnace shaft angle, furnace waist diameter, furnace throat diameter and furnace type size of the blast furnace. The basic properties of the smokeless lump coal include the composition and particle size distribution of the smokeless lump coal. The blast furnace operation parameters comprise yield, the amount of the smokeless lump coal charged into the blast furnace per ton of iron, coal ratio, coke ratio, fuel ratio, smelting strength, pig iron qualification rate, oxygen enrichment rate, stockline, ore batch and coke batch. The furnace atmosphere of the blast furnace comprises CO and CO2、N2、H2And H2O。
And secondly, aiming at a plurality of EDEM simulation height values of the fuel material column, acquiring EDEM simulation temperature values corresponding to the simulation height values, performing a simulated blast furnace experiment on the smokeless lump coal in the programmed reduction furnace, simulating the atmosphere and the temperature rise system of the blast furnace, sampling and analyzing the metallurgical performance of the smokeless lump coal after the experiment is finished, and establishing a corresponding relation between the temperature values of the smokeless lump coal under the simulation height values and the metallurgical performance numerical values of the smokeless lump coal.
The method comprises the following steps of thermal bursting performance of the smokeless lump coal, reactivity of the smokeless lump coal, strength after reaction of the smokeless lump coal, wear-resisting strength after reaction of the smokeless lump coal, high-temperature compressive strength of the smokeless lump coal, dissolution loss reaction degree of the smokeless lump coal, interaction of the smokeless lump coal and coke, XRD, SEM and RAMAN detection and analysis of the smokeless lump coal.
The thermal decrepitation index of the smokeless lump coal is calculated by the following formula:
DI-3.15=（m2*100）/m1in the formula: m is1Represents the mass of the sample after heat treatment, g; m is2Representing the mass, g, of the anthracite block coal having a particle size of less than 3.15mm after screening.
The mass fraction of the sample after reaction to the sample before reaction represents the reactivity, and the mass fraction of the sample after reaction to the sample after reaction is greater than 10mm, and the calculation formula is as follows:
reactivity = (mass after reaction)/(mass before reaction) × 100%;
post-reaction strength = (particle diameter after drum is greater than 10mm mass)/(post-reaction mass) × 100%.
In the process of the smokeless lump coal moving from top to bottom in the blast furnace, a series of deterioration reactions occur, so that the particle size is reduced, and powder is generated. After the smokeless lump coal is subjected to simulated blast furnace experiment reaction, screening out different granularities from a sample, calculating the proportion of coal with different granularities, checking the granularity distribution of the smokeless lump coal in the blast furnace, and calculating the wear-resisting strength after the reaction. Abrasion resistance M5The calculation formula is as follows:
M5=（m3×100）/m4in the formula, m3Represents a mass with a particle size of less than 5mm, g; m is4Represents the total mass after reaction, g.
The calculation formula of the high-temperature compressive strength sigma of the anthracite block coal is as follows:
σ = (2P)/(pi dl), where σ represents compressive strength, GPa; p represents pressure, N; d represents the diameter of the lump coal sample, mm; l represents the length of the lump coal sample in mm.
The interaction of the anthracite coal with the coke is an important chemical interaction within the blast furnace. The smokeless lump coal can replace part of coke breeze in actual production, and reduce the consumption of carbon melting loss reaction of blast furnace coke, thereby achieving the purpose ofThe coke ratio is reduced. The coke is crushed into pieces of 23-25mm and 100 g. The smokeless lump coal is crushed into 10-20mm and 20-30mm, and each group is 100 g. The coke is respectively and uniformly mixed with 10-20mm and 20-30mm smokeless lump coal. 100 g of smokeless lump coal and coke are respectively placed in a programmed reduction furnace, the temperature is increased from room temperature to 1100 ℃ at the temperature increase rate of 5 ℃/min under the protection of nitrogen atmosphere, and the temperature increase stage N is carried out2The flow rate is 2L/min to prevent the coal from burning, damaging and oxidizing. When the temperature of the material layer reaches 1100 ℃, cutting off nitrogen and introducing CO2，CO2The flow rate is 5L/min, and the reaction is carried out for 2 hours at constant temperature. After carbon dioxide is introduced, the temperature of the material layer is kept at 1100 ℃ within 5-10 min. After the reaction is finished, the temperature is reduced to room temperature under the protection of a nitrogen atmosphere. After the experiment, the sample is taken out, coke and lump coal are separated out, and the coke and the lump coal are respectively weighed. The reaction rate of coke and lump coal was calculated.
The chemical reactions mainly occurring in the blast furnace for the smokeless lump coal are as follows: c + CO2=2CO, the organization structure, phase composition and surface morphology of the smokeless lump coal are changed after the smokeless lump coal is eroded by the dissolution loss of carbon dioxide, thermal stress, mechanical force and the like. Crushing the anthracite block coal into particles with the particle diameter of 16-20mm, putting the particles into a programmed reduction furnace, and introducing N with the flow rate of 2L/min2Protecting, heating to 1100 deg.C at a heating rate of 10 deg.C/min, closing nitrogen gas, and introducing CO at flow rate of 5L/min2And reacting at constant temperature for 2 hours, and performing SEM, XRD and Raman detection analysis on the reacted sample.
And step three, mapping and associating the maximum compressive stress borne by the smokeless lump coal obtained in the step one in the material column with the change of the height of the material column and the corresponding relation between the temperature value of the smokeless lump coal obtained in the step two and the metallurgical performance numerical value of the smokeless lump coal to obtain the top-down degradation process of the smokeless lump coal after entering the blast furnace from the top of the blast furnace. A method for researching the degradation of smokeless lump coal in a blast furnace comprises the metallurgical performance degradation processes of the smokeless lump coal from a feed inlet at the top of the blast furnace to the lower part of a blast furnace flexible smelting belt at different heights, the reactivity of the smokeless lump coal, the strength of the smokeless lump coal after reaction, the wear-resisting strength of the smokeless lump coal after reaction, the dissolution loss reaction degree of the smokeless lump coal, the high-temperature compressive strength of the smokeless lump coal and the interaction of the smokeless lump coal and coke.
Examples
The technical route of the present embodiment is shown in fig. 1. Firstly, determining the effective volume of the blast furnace, then detecting the metallurgical performance of the smokeless lump coal at different zone temperatures and corresponding temperatures of the blast furnace, and finally obtaining the top-down degradation process of the smokeless lump coal after entering the blast furnace from the top of the blast furnace.
Based on blast furnace design parameters, smokeless lump coal basic performance and blast furnace operation parameters, EDEM simulation software is adopted for modeling and numerical simulation, and a material column height-pressure relation diagram of furnace burden in the blast furnace is obtained and is shown in figure 2.
A program reduction furnace is adopted to simulate the temperature and atmosphere change of the smokeless lump coal in the top-down movement process of the blast furnace, a simulated blast furnace experiment is carried out, and the metallurgical performance results of the smokeless lump coal (the thermal explosion performance of the smokeless lump coal, the reactivity of the smokeless lump coal, the strength after the reaction of the smokeless lump coal, the wear-resisting strength after the reaction of the smokeless lump coal, the high-temperature compression strength of the smokeless lump coal, the dissolution loss reaction degree of the smokeless lump coal, the interaction between the smokeless lump coal and coke, the XRD, SEM and RAMAN detection and analysis) are obtained by sampling after the furnace is stopped stage by stage.
Table 1 shows the experimental results of 10-20mm smokeless lump coal after simulated blast furnace experiments
Table 2 shows the experimental results of anthracite coal of 20-30mm after the simulated blast furnace experiment
Table 3 shows the reactivity and strength after reaction of the anthracite briquettes
The reactivity of the anthracite block coal and the coke is basically the same, which shows that the anthracite block coal has certain reducibility, can play a role in reducing iron-containing furnace burden and is used in blast furnace gasIn the atmosphere, a certain amount of CO can be consumed2The loss amount of carbon dissolution reaction of the coke is reduced, and the coke is indirectly protected. The reacted smokeless lump coal has lower strength than coke and produces powder in the soft melting zone, but the smokeless lump coal still has certain lump shape and certain compression strength, so that the gas permeability of the material column is not greatly influenced.
Figure 2 is the interaction of anthracite coal with coke.
As the particle size of the anthracite coal decreases, the reactivity of the coke decreases. Illustrating the smokeless lump coal and CO with the particle size of 10-20mm2The contact area of the atmosphere is larger than the smokeless lump coal with the granularity of 20-30mm, so that the contact area is in CO2Under the atmosphere, the smokeless lump coal with the particle size of 10-20mm can share more part of CO for coke2Thereby reducing the reactivity of the coke and indirectly achieving the function of protecting the coke.
FIG. 3 is an SEM of the texture of the smokeless lump coal after the solution loss reaction.
Wherein, (a) and (b) are the original surface appearance of the smokeless lump coal, and (c) and (d) are the surface appearance of the smokeless lump coal after carbon melting loss reaction, and the surface of the smokeless lump coal is smooth and flat, and the organization structure is compact. Comparing the structure of the tissue morphology before and after the reaction, wherein the shallow fine ditch marks of the non-reacted smokeless lump coal become deep after the carbon dissolution reaction; the smooth surface before the reaction became uneven and deep furrows were formed after the reaction, indicating that the anthracite coal and CO were present2The reaction is stronger, and the melting loss of the smokeless lump coal is more serious.
Table 4 shows the RAMAN structural parameters of the smokeless lump coal
| |
22540 | 4784.0267 | 190.80150 | 80.206358 | 110.98988 | 56.034124 | 4.71 |
Area of D Peak (A)D) Area with G peak (A)G) The ratio characterizes the degree of order of the carbon structure, which follows AD/AGIs increased. The peak fit curve and structural parameters of anthracite coal are shown in the figure: the larger the dissolution loss degree of the smokeless lump coal is, the lower the degree of order of the smokeless lump coal is.
FIG. 4 is a RAMAN peak value fitting curve of the anthracite block, and FIG. 5 is a XRD diffraction graph of the anthracite block, wherein as the dissolution loss reaction degree of the anthracite is increased, diffraction peaks in an X-ray diffraction graph are gradually increased and the width is narrowed. Under the action of high temperature, the decomposition and polymerization in the anthracite structure continuously occur, so the distance (d) between carbon atom networks（002）) Smaller and smaller, microcrystalline LDAnd LCIs continuously expanding.
Fig. 6 is a graph of a relationship between a height of a burden column of a blast furnace and a maximum compressive stress, in which a change of an acting force of the burden column from a furnace top to a furnace belly is gradually increased from top to bottom, the maximum compressive stress borne by the burden in a block belt area is about 2000N, and the maximum compressive stress borne by the burden in a soft melting belt area is about 7000N.
Claims (5)
1. A method for researching the deterioration of smokeless lump coal in a blast furnace is characterized in that: the method comprises the following steps:
firstly, based on blast furnace design parameters, basic metallurgical performance of the smokeless lump coal and blast furnace operating parameters, adopting EDEM simulation software for modeling and numerical simulation to generate the change of the maximum compressive stress of the smokeless lump coal in the blast furnace under a certain cross section of a stock column along with the height of the stock column; thereby obtaining the corresponding relation between the height value of the furnace charge column and the EDEM simulated pressure value of the furnace charge column at the corresponding height;
secondly, aiming at a plurality of EDEM simulation height values of the fuel material column, acquiring EDEM simulation temperature values corresponding to the simulation height values, performing a simulated blast furnace experiment on the smokeless lump coal in a programmed reduction furnace, simulating a blast furnace atmosphere and a temperature rise system, sampling and analyzing the metallurgical performance of the smokeless lump coal after the experiment is finished, and establishing a corresponding relation between the temperature values of the smokeless lump coal under the simulation height values and the metallurgical performance numerical values of the smokeless lump coal;
and thirdly, mapping and associating the maximum compressive stress borne by the smokeless lump coal obtained in the first step in the material column with the corresponding relation between the temperature of the smokeless lump coal obtained in the second step and the metallurgical performance numerical value of the smokeless lump coal to obtain the top-down degradation process of the smokeless lump coal after entering the blast furnace from the top of the blast furnace.
2. The method for researching the deterioration of the smokeless lump coal in the blast furnace according to claim 1, wherein: the design parameters of the blast furnace comprise effective volume, effective height, hearth diameter, hearth height, furnace belly angle, furnace body angle, furnace waist diameter, furnace throat diameter and furnace type size of the blast furnace.
3. The method for researching the deterioration of the smokeless lump coal in the blast furnace according to claim 1, wherein: the basic metallurgical properties of the smokeless lump coal include the components and the particle size distribution of the smokeless lump coal.
4. The method for researching the deterioration of the smokeless lump coal in the blast furnace according to claim 1, wherein: the blast furnace operation parameters comprise yield, the amount of the smokeless lump coal charged into the blast furnace per ton of iron, coal ratio, coke ratio, fuel ratio, smelting strength, pig iron qualification rate, oxygen enrichment rate, stockline, ore batch and coke batch.
5. The method for researching the deterioration of the smokeless lump coal in the blast furnace according to claim 1, wherein: the metallurgical properties of the smokeless lump coal comprise the thermal explosion property of the smokeless lump coal, the reactivity and the strength after reaction of the smokeless lump coal, the wear-resisting strength after reaction of the smokeless lump coal, the dissolution loss reaction degree of the smokeless lump coal, the maximum compressive stress after reaction of the smokeless lump coal, the interaction between the smokeless lump coal and coke, the XRD, SEM and RAMAN detection and analysis of the smokeless lump coal.
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