CN117233197A - Method for detecting high-temperature reflow performance of comprehensive furnace burden of iron-making blast furnace - Google Patents
Method for detecting high-temperature reflow performance of comprehensive furnace burden of iron-making blast furnace Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 21
- 238000002474 experimental method Methods 0.000 claims abstract description 31
- 230000009467 reduction Effects 0.000 claims abstract description 30
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 74
- 229910052742 iron Inorganic materials 0.000 claims description 37
- 239000000571 coke Substances 0.000 claims description 21
- 239000008188 pellet Substances 0.000 claims description 21
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 6
- 230000000630 rising effect Effects 0.000 claims description 6
- 238000001035 drying Methods 0.000 claims description 5
- 229910002804 graphite Inorganic materials 0.000 claims description 5
- 239000010439 graphite Substances 0.000 claims description 5
- 239000002245 particle Substances 0.000 claims description 5
- 238000005070 sampling Methods 0.000 claims description 4
- 238000002844 melting Methods 0.000 claims description 3
- 230000008018 melting Effects 0.000 claims description 3
- 210000004907 gland Anatomy 0.000 claims description 2
- 238000010438 heat treatment Methods 0.000 claims description 2
- 238000007873 sieving Methods 0.000 claims description 2
- 239000007789 gas Substances 0.000 claims 8
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims 1
- 239000003546 flue gas Substances 0.000 claims 1
- 238000001514 detection method Methods 0.000 abstract 1
- 239000000463 material Substances 0.000 description 8
- 238000006243 chemical reaction Methods 0.000 description 6
- 239000000203 mixture Substances 0.000 description 6
- 230000001276 controlling effect Effects 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 239000003034 coal gas Substances 0.000 description 3
- 238000011946 reduction process Methods 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 239000002131 composite material Substances 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000003993 interaction Effects 0.000 description 2
- 230000035699 permeability Effects 0.000 description 2
- 239000002893 slag Substances 0.000 description 2
- 239000000779 smoke Substances 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 239000004484 Briquette Substances 0.000 description 1
- 238000003723 Smelting Methods 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 238000012512 characterization method Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 238000009851 ferrous metallurgy Methods 0.000 description 1
- 230000004927 fusion Effects 0.000 description 1
- 230000002452 interceptive effect Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 238000006386 neutralization reaction Methods 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 238000005303 weighing Methods 0.000 description 1
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Abstract
The invention discloses a method for detecting the high-temperature reflow performance of an iron-making blast furnace comprehensive burden, which mainly solves the technical problem that the high-temperature reflow performance of the iron-making blast furnace comprehensive burden cannot be detected in the prior art. The technical proposal is that the method for detecting the high-temperature reflow performance of the comprehensive furnace burden of the ironmaking blast furnace comprises the following steps: s1, preparing a comprehensive furnace charge sample; s2 pair of samplesPerforming a high-temperature reduction experiment; s3, collecting sample data in a high-temperature reduction experiment, controlling a high-temperature droplet furnace to collect sample temperature, pressure difference and shrinkage data in the high-temperature reduction experiment, and drawing a sample temperature-pressure difference-shrinkage relation curve through a computer to obtain a characteristic parameter T 10 、T d Delta T; s4, calculating the gas utilization index of the comprehensive furnace burden. The method evaluates the gas utilization index as an important index of reasonable furnace burden structure, and realizes scientific detection of the high-temperature reflow performance of the comprehensive furnace burden of the iron-making blast furnace.
Description
Technical Field
The invention belongs to the field of ferrous metallurgy, and particularly relates to an experimental method for evaluating high-temperature reflow performance of a comprehensive furnace burden.
Background
The iron and steel industry is an important responsibility main body for achieving the carbon-to-peak carbon neutralization target, but optimization research on furnace burden structure is required to be improved continuously. High energy consumption, high pollution and high cost have been regarded as characteristics of blast furnaces. Along with the progress of science and technology, under the pressure of environment and cost, under the policy of ensuring the parallel of 'economic materials' and 'refined materials' of a blast furnace, the reasonable blast furnace burden structure is regulated so as to obtain high yield, high quality, low consumption and low cost, and the method has become the focus of common attention in iron-making industries at home and abroad.
Reasonable furnace burden structure is the basis of stable and smooth operation of the blast furnace, and the iron-containing furnace burden is required to have good metallurgical performance and comprehensive furnace burden performance, so that the smelting requirement of the blast furnace is met. In the comprehensive furnace burden, because the sinter, pellet and lump ore have obvious differences in chemical composition, microstructure and the like, the interface interaction reaction and slag forming behavior are different, when the sinter, the pellet and the lump ore are contacted with each other, the diffusion and chemical reaction of components are easy to occur under the pushing of concentration gradient in a high-temperature state, the generation condition of low-melting-point compounds near the contact surface of the iron-containing furnace burden is changed, and the low-melting-point compounds are particularly expressed as low-melting-point phases, so that the reflow temperature of high-alkalinity sinter ore is reduced, and the softening and melting behavior of the iron-containing furnace burden is influenced, and the reaction is called high Wen Jiaohu reaction. The reaction is a core essence affecting the air permeability of the comprehensive furnace burden, and relates to interfacial microcosmic mineralogy characterization and multiple complex solid-liquid system thermodynamic calculation. And the cooperative reduction behavior exists among different furnace charges, the behavior of the iron-containing furnace charge in a high-temperature area of the blast furnace is deduced only according to the reflow performance of a single furnace charge or a comprehensive furnace charge, and the high-temperature reflow performance of the different iron-containing furnace charges is not fully represented.
Therefore, it is necessary to study a method for detecting the high-temperature reflow property of the integrated burden of an iron-making blast furnace to solve one or more of the above problems.
Disclosure of Invention
The invention aims to provide a method for detecting the high-temperature reflow performance of an iron-making blast furnace comprehensive burden, which mainly solves the technical problem that the high-temperature reflow performance of the iron-making blast furnace comprehensive burden cannot be detected in the prior art.
The method thoroughly solves the problem that the behavior of the comprehensive furnace burden in the high-temperature area of the blast furnace is not comprehensive and accurate only according to the molten drop performance of a single furnace burden or the comprehensive furnace burden due to the interactive reaction between the sinter ore and the lump ore/pellet ore and the cooperative reduction behavior existing between different furnace burden.
The method adopts the technical thought that through the high-temperature reduction experiment, the gas composition of the top gas is monitored in real time in the reduction process, and further, the indirect reduction and the direct reduction which occur in the reduction process of different furnace burden structures are analyzed based on the smoke composition, the gas utilization indexes of different furnace burden structures are calculated and compared, the technical defect of the behavior of the iron-containing furnace in a high-temperature area of the blast furnace is overcome, theoretical support can be provided for optimizing ore blending of the blast furnace, and the operation cost of production enterprises is reduced.
The technical scheme adopted by the invention is that the method for detecting the high-temperature reflow performance of the comprehensive furnace burden of the iron-making blast furnace comprises the following steps:
s1, preparing a comprehensive furnace charge sample, preparing an iron-containing furnace charge and coke sample with granularity of 10.0-12.5 mm, drying the iron-containing furnace charge and coke in an oven, and taking out the dried sample for later use;
s2, performing a high-temperature reduction experiment on the sample, placing a graphite crucible filled with the comprehensive furnace charge sample in a high-temperature droplet furnace, wherein a gas analyzer is arranged in the high-temperature droplet furnace, controlling the high-temperature droplet furnace to perform the high-temperature reduction experiment on the sample, firstly raising the sample to a constant temperature area, and then sequentially introducing N after raising the temperature to the constant temperature area 2 Carrying out a high-temperature reduction experiment on the sample by CO, and after the CO is introduced into the droplet furnace, starting to collect the top gas component of the high-temperature droplet furnace by a gas analyzer;
s3, collecting sample data in a high-temperature reduction experiment, controlling a high-temperature droplet furnace to collect sample temperature, pressure difference and shrinkage data in the high-temperature reduction experiment, and drawing a sample temperature-pressure difference-shrinkage relation curve through a computer to obtain a characteristic parameter T 10 、T d And DeltaT, where T 10 The softening start temperature of the sample is given in degrees centigrade; t (T) d Is the sample drop temperature, the unit is the temperature of the sample drop interval, deltaT is the temperature of the sample drop interval, deltaT=T d -T 10 The unit is DEG;
s4, calculating the gas utilization index of the comprehensive furnace burden, wherein the gas utilization index of the comprehensive furnace burden is calculated according to a formula 1,in the formula 1, A is the gas utilization index of the comprehensive furnace burden to be tested; t (T) 10 The softening start temperature of a comprehensive furnace charge sample to be measured is given in the unit of DEG C; t (T) d The drop temperature of the comprehensive furnace charge sample to be measured is expressed in the unit of DEG C; q is the flow rate of CO in the top gas of the high-temperature drop furnace, and the unit is L/min; t is the temperature of the comprehensive furnace burden sample to be measured, and the unit is the temperature.
Further, in step S1, it includes: crushing the sintered ore, lump ore and coke, and sieving the sample with the granularity of 10.0-12.5 mm; the pellets are sieved to obtain samples with the granularity of 10.0-12.5 mm.
In step S2, the comprehensive charge sample includes: 500+/-0.5 g of iron-containing furnace charge and 120g of coke; the iron-containing furnace material is a single furnace material; during sampling, directly weighing a single iron-containing furnace burden; the iron-containing furnace burden is a mixed furnace burden, and during sampling, sintered ore, pellet ore and lump ore are firstly configured into a comprehensive furnace burden according to the furnace burden structure, uniformly mixed and then weighed.
In the step S2, a comprehensive furnace charge sample is filled in a graphite crucible, wherein 80g of coke is firstly filled in the bottom of the crucible and a coke layer is flattened, then 500g of iron-containing furnace charge is added, the height of the furnace charge is measured after flattening, and finally 40g of coke is added, and a crucible gland is arranged after flattening.
In step S2, a high-temperature droplet furnace is controlled to perform a high-temperature reduction experiment on a sample, including: heating the sample from room temperature, and introducing N into a high-temperature droplet furnace when the temperature of the sample is between room temperature and 500 DEG C 2 ，N 2 The flow is 5L/min, the temperature of the sample is raised from 500 ℃ to the sample dripping temperature, and CO is simultaneously introduced into the high-temperature melting drop furnaceAnd N 2 CO flow is 1.5L/min, N 2 The flow rate is 3.5L/min; after the high-temperature reduction experiment of the sample is finished, introducing N into a high-temperature molten drop furnace 2 The sample was cooled to room temperature, N 2 The flow rate was 3L/min.
In the step S2, when the temperature of the sample is less than 900 ℃, the temperature rising rate of the sample is 8-12 ℃/min; the temperature of the sample is 900-1100 ℃, and the temperature rising rate of the sample is 1.5-3.0 ℃/min; the temperature of the sample is less than 1100 ℃ and less than or equal to the dropping temperature of the sample, and the temperature rising rate of the sample is 4-6 ℃/min.
In the step S2, the smoke analyzer starts to collect the top gas component of the high-temperature droplet furnace, and the frequency of collecting data is not less than 1 time/8 seconds.
Softening onset temperature T according to the invention 10 The softening shrinkage rate of the iron-containing furnace material reaches the temperature corresponding to 10%; drop temperature T d For the temperature at which the slag iron starts to drip, the inter-drip temperature Δt=t d -T 10 。
Compared with the prior art, the invention has the following positive effects: 1. the invention evaluates the coal gas utilization index as an important index of reasonable furnace burden structure, comprehensively evaluates the high Wen Jiaohu effect of sintered ore, pellet ore and lump ore in the iron-containing furnace burden and the cooperative reduction behavior among different furnace burden, and overcomes the defects of incomplete and inaccurate behavior of the comprehensive furnace burden in a high temperature area of the blast furnace, which is inferred only according to the melt drop performance of a single furnace burden or the comprehensive furnace burden. 2. The method can perfect the evaluation index of the metallurgical performance of the iron ore and provide theoretical basis and technical support for optimizing reasonable furnace burden structure of the blast furnace; the collocation mode of blast furnace iron-containing burden materials can be optimized, the use proportion of different iron ores can be adjusted, and support is provided for the reasonable use of high-proportion lump ore/pellet ore by the blast furnace. 3. The method provides support for the production of pellets and lump ores in the blast furnace, reduces the production and operation cost, and provides support for the low-carbon and green production of iron and steel enterprises.
Detailed Description
The invention is further illustrated in the following in connection with examples 1-5, as shown in tables 1-2.
A method for detecting high-temperature reflow performance of comprehensive furnace burden of an iron-making blast furnace comprises the following steps:
s1, preparing a comprehensive furnace charge sample, preparing an iron-containing furnace charge and coke sample with granularity of 10.0-12.5 mm, drying the iron-containing furnace charge and coke in an oven, and taking out the dried sample for later use;
s2, performing a high-temperature reduction experiment on the sample, placing a graphite crucible filled with the comprehensive furnace charge sample in a high-temperature droplet furnace, wherein a gas analyzer is arranged in the high-temperature droplet furnace, controlling the high-temperature droplet furnace to perform the high-temperature reduction experiment on the sample, firstly raising the sample to a constant temperature area, and then sequentially introducing N after raising the temperature to the constant temperature area 2 Carrying out a high-temperature reduction experiment on the sample by CO, and after the CO is introduced into the droplet furnace, starting to collect the top gas component of the high-temperature droplet furnace by a gas analyzer;
s3, collecting sample data in a high-temperature reduction experiment, controlling a high-temperature droplet furnace to collect sample temperature, pressure difference and shrinkage data in the high-temperature reduction experiment, and drawing a sample temperature-pressure difference-shrinkage relation curve through a computer to obtain a characteristic parameter T 10 、T d And DeltaT, where T 10 The softening start temperature of the sample is given in degrees centigrade; t (T) d Is the sample drop temperature, the unit is the temperature of the sample drop interval, deltaT is the temperature of the sample drop interval, deltaT=T d -T 10 The unit is DEG;
s4, calculating the gas utilization index of the comprehensive furnace burden, wherein the gas utilization index of the comprehensive furnace burden is calculated according to a formula 1,in the formula 1, A is the gas utilization index of the comprehensive furnace burden to be tested; t (T) 10 The softening start temperature of a comprehensive furnace charge sample to be measured is given in the unit of DEG C; t (T) d The drop temperature of the comprehensive furnace charge sample to be measured is expressed in the unit of DEG C; q is the flow rate of CO in the top gas of the high-temperature drop furnace, and the unit is L/min; t is the temperature of the comprehensive furnace burden sample to be measured, and the unit is the temperature.
TABLE 1 chemical compositions of iron-containing furnace materials according to examples of the invention
Examples 1-3 are droplet experiments with a single iron-containing charge, and example 1 is a composite charge comprising: 120g of dried coke with the particle size of 10-12.5 mm and 500g of sintered ore; example 2 comprehensive charge comprising: 120g of dried coke with the particle size of 10-12.5 mm and 500g of pellet ore; example 3 comprehensive charge comprising: 120g of dried coke with the particle size of 10-12.5 mm and 500g of lump ore; according to the temperature-pressure difference-shrinkage rate relation curve acquired by the droplet experiment, obtaining a characteristic parameter T 10 (softening onset temperature) and T d (drip temperature) and droplet interval temperature Δt.
Examples 4 and 5 are mixed furnace burden molten drop experiments, and the example 4 comprehensive furnace burden comprises 120g of coke with the particle size of 10-12.5 mm after drying and 500g of mixed furnace burden, wherein the mixed furnace burden comprises the following components in percentage by weight: 78% of sintered ore, 5% of pellet and 17% of lump ore; example 5 the comprehensive burden comprises 120g of coke with the grain size of 10-12.5 mm after drying and 500g of mixed burden, wherein the mixed burden comprises the following components in percentage by weight: 73% of sintered ore, 5% of pellet and 22% of lump ore; according to the temperature-pressure difference-shrinkage rate relation curve acquired by the droplet experiment, obtaining a characteristic parameter T 10 (softening onset temperature) and T d (drip temperature) and a droplet temperature interval Δt. Examples the high temperature reflow performance parameters of the integrated charge are shown in the table.
TABLE 2 high temperature reflow performance parameters for the composite burden of the examples of the invention
| Category(s) | Iron-containing furnace material composition wt% | T 10 /℃ | T d /℃ | ΔT/℃ | A/L·℃/min |
| Example 1 | 100% of sinter | 1242 | 1549 | 301 | 243.64 |
| Example 2 | 100% of pellet | 1145 | 1482 | 337 | 276.34 |
| Example 3 | Lump ore 100% | 1095 | 1447 | 352 | 216.61 |
| Example 4 | 78% of sintered ore, 5% of pellet and 17% of lump ore | 1233 | 1445 | 212 | 253.76 |
| Example 5 | 73% of sintered ore, 5% of pellet and 22% of lump ore | 1235 | 1442 | 207 | 275.35 |
As shown in table 2, in example 1, 100% of the sintered ore had a gas utilization index of 243.64l· ℃/min; in example 2, the 100% gas utilization index of pellets was 276.34L· ℃/min; in example 3, the coal gas utilization index of 100% of lump ore is 216.61L· ℃/min; in example 4, the gas utilization index A of 78% of sinter, 5% of pellets and 17% of lump ore is 253.76L· ℃/min; in example 5, the coal gas utilization index A of 73% sinter, 5% pellet, and 22% briquette was 275.35L· ℃/min.
The result shows that the high Wen Jiaohu between the agglomerate and the lump ore/pellet improves the droplet performance of the mixture, reduces the droplet interval, improves the air permeability of the blast furnace burden, and has wider droplet temperature interval obtained by the lump ore as a single burden experiment, but has good interaction effect after the lump ore and the agglomerate form the mixed iron-containing burden, so that the droplet performance of the iron ore is obviously improved. Meanwhile, compared with the gas utilization indexes of two comprehensive furnace charges, direct reduction and fusion reduction mainly occur to ores in a droplet temperature range, the droplet range is reduced due to the fact that the proportion of lump ores is increased, but the gas utilization indexes are increased, so that the reduction process is more severe, the high-temperature reflow performance is better, and the result is consistent with that obtained by droplet characteristic temperature analysis.
The invention aims to provide an experimental method for evaluating the reflow performance of comprehensive furnace charges, by adopting the experimental method, the collocation mode of blast furnace iron-containing furnace charges can be optimized, the use proportion of different iron ores can be adjusted, and the feasibility and the technical direction of reasonably using high-proportion lump ore/pellet ore by the blast furnace are discussed.
In addition to the embodiments described above, other embodiments of the invention are possible. All technical schemes formed by equivalent substitution or equivalent transformation fall within the protection scope of the invention.
Claims (6)
1. The method for detecting the high-temperature reflow performance of the comprehensive furnace burden of the iron-making blast furnace is characterized by comprising the following steps of:
s1, preparing a comprehensive furnace charge sample, preparing an iron-containing furnace charge and coke sample with granularity of 10.0-12.5 mm, drying the iron-containing furnace charge and coke in an oven, and taking out the dried sample for later use;
s2, performing a high-temperature reduction experiment on the sample, placing a graphite crucible filled with the comprehensive furnace charge sample in a high-temperature droplet furnace, wherein a gas analyzer is arranged in the high-temperature droplet furnace, controlling the high-temperature droplet furnace to perform the high-temperature reduction experiment on the sample, firstly raising the sample to a constant temperature area, and then sequentially introducing N after raising the temperature to the constant temperature area 2 Carrying out a high-temperature reduction experiment on the sample by CO, and after the CO is introduced into the droplet furnace, starting to collect the top gas component of the high-temperature droplet furnace by a gas analyzer;
s3, collecting sample data in a high-temperature reduction experiment, controlling a high-temperature droplet furnace to collect sample temperature, pressure difference and shrinkage data in the high-temperature reduction experiment, and drawing a sample temperature-pressure difference-shrinkage relation curve through a computer to obtain a characteristic parameter T 10 、T d And DeltaT, where T 10 The softening start temperature of the sample is given in degrees centigrade; t (T) d Is the sample drop temperature, the unit is the temperature of the sample drop interval, deltaT is the temperature of the sample drop interval, deltaT=T d -T 10 The unit is DEG;
s4, calculating the gas utilization index of the comprehensive furnace burden, wherein the gas utilization index of the comprehensive furnace burden is calculated according to a formula 1,in the formula 1, A is the gas utilization index of the comprehensive furnace burden to be tested; t (T) 10 The softening start temperature of a comprehensive furnace charge sample to be measured is given in the unit of DEG C; t (T) d The drop temperature of the comprehensive furnace charge sample to be measured is expressed in the unit of DEG C; q is the flow rate of CO in the top gas of the high-temperature drop furnace, and the unit is L/min; t is the temperature of the comprehensive furnace burden sample to be measured, and the unit is the temperature.
2. The method for detecting the high-temperature reflow performance of the comprehensive furnace burden of the ironmaking blast furnace according to claim 1, which is characterized in that,
in step S1, it includes: crushing the sintered ore, lump ore and coke, and sieving the sample with the granularity of 10.0-12.5 mm; the pellets were sieved to obtain samples having a particle size of 10.0 to 12.5 mm.
3. The method for detecting the high-temperature reflow performance of the comprehensive furnace burden of the ironmaking blast furnace according to claim 1, which is characterized in that,
in step S2, the comprehensive charge sample includes: 500+/-0.5 g of iron-containing furnace charge and 120g of coke; the iron-containing furnace burden is a single furnace burden, and the single iron-containing furnace burden is directly weighed when sampling is carried out; the iron-containing furnace burden is a mixed furnace burden, and during sampling, sintered ore, pellet ore and lump ore are firstly configured into a comprehensive furnace burden according to the furnace burden structure, uniformly mixed and then weighed.
4. The method for detecting the high-temperature reflow performance of the integrated furnace burden of the ironmaking blast furnace according to claim 3, wherein in the step S2, the integrated furnace burden sample is filled in a graphite crucible, and the method comprises the steps of firstly filling 80g of coke into the bottom of the crucible and flattening a coke layer, then adding 500g of iron-containing furnace burden, measuring the height of the furnace burden after flattening, finally adding 40g of coke, flattening and then placing a crucible gland.
5. The method for detecting the high-temperature reflow performance of the comprehensive furnace burden of the ironmaking blast furnace according to claim 3, which is characterized in that,
in step S2, a high-temperature droplet furnace is controlled to perform a high-temperature reduction experiment on a sample, including: heating the sample from room temperature, and introducing N into a high-temperature droplet furnace when the temperature of the sample is between room temperature and 500 DEG C 2 ，N 2 The flow is 5L/min, the sample is heated from 500 ℃ to the dropping temperature of the sample, and CO and N are simultaneously introduced into the high-temperature melting drop furnace 2 CO flow is 1.5L/min, N 2 The flow rate is 3.5L/min; after the high-temperature reduction experiment of the sample is finished, introducing N into a high-temperature molten drop furnace 2 The sample was cooled to room temperature, N 2 The flow is 3L/min; when the temperature of the sample is less than 900℃, the sampleThe temperature rising rate is 8-12 ℃/min; the temperature of the sample is 900-1100 ℃, and the temperature rising rate of the sample is 1.5-3.0 ℃/min; the temperature of the sample is less than 1100 ℃ and less than or equal to the dropping temperature of the sample, and the temperature rising rate of the sample is 4-6 ℃/min.
6. The method for detecting the high-temperature reflow performance of the comprehensive furnace burden of the ironmaking blast furnace according to claim 1, wherein in the step S2, the collection of the high-temperature molten drop furnace top gas component is started by a flue gas analyzer, and the frequency of the collection data is not less than 1 time/8 seconds.
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