CN111595718A - Test method for detecting coke mixing thermal property by using coke reactivity measuring device - Google Patents
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Abstract
The invention relates to a test method for detecting the thermal property of mixed coke by using a coke reactivity measuring device, belonging to the technical field of metallurgy. The technical scheme is as follows: putting different types of cokes into a coke reactivity measuring device uniformly layer by layer according to a specific mass ratio to carry out a detection test on the thermal property of the mixed coke, cooling the mixed coke in an N2 atmosphere after the reaction is finished, and measuring the strength of the mixed coke after the reaction by using an I-type rotary drum. The invention has the beneficial effects that: the coke reactivity measuring device is utilized to simulate the dissolution loss reaction process of the mixed coke in the blast furnace under the laboratory condition, the relation between the reactivity index and the strength index after reaction of the mixed coke, the reaction time and the dissolution loss degree is obtained, reliable technical parameters are provided for coke quality selection and coke mixing proportion determination, the stable operation of the blast furnace is facilitated, and the coke cost is reduced.
Description
Technical Field
The invention relates to a test method for detecting the thermal property of mixed coke by using a coke reactivity measuring device, belonging to the technical field of metallurgy.
Background
The thermal property of metallurgical coke is always considered as the most important technical index for evaluating the coke quality, and plays an important role in influencing blast furnace smelting. Ironmaking workers generally think that coke and CO2 gas in a blast furnace are subjected to dissolution loss reaction near a reflow zone, and the reaction temperature range is about 900-1300 ℃. This reaction is a major factor in the deterioration of coke. At present, a method for detecting the thermal performance of single coke is proposed by Nippon Nissan iron company in about 70 th of 20 th century, and China also lists the method as the national standard for detecting the thermal performance of the single coke, namely GB/T4000-plus 2017 coke reactivity and post-reaction strength test method. The method comprises subjecting 200g of spherical coke with particle size of 23-25 mm and CO2 gas with flow rate of 5L/min to dissolution reaction for 2h, and measuring reactivity index CRI and post-reaction strength index CSR.
With the progress of large-scale development of iron-making blast furnaces in China and the large background that the country increasingly pays attention to environmental protection and continuously limits the coke production capacity, numerous enterprises face the current production situation that the coke production capacity is not enough and a large amount of outsourcing of coke of other enterprises and the mixing use of the coke produced by the enterprises are needed. At present, no detection method for the thermal performance of the mixed coke exists. Enterprises generally sum the individual coke CSR index values multiplied by their blend ratios in the blended coke to obtain an average value as a blended coke thermal performance index. The method for evaluating the thermal performance of the mixed coke has certain problems, and the coupling effect between the mixed coke and the blast furnace is not considered, so that the fluctuation of the blast furnace smelting furnace condition is caused, and a plurality of technical problems and great economic losses are brought to the production of enterprises. Therefore, it is highly desirable to provide a test method for detecting the thermal properties of a blended coke, which provides reliable parameters for coke quality selection and coke compounding ratio determination.
Disclosure of Invention
The invention aims to provide a test method for detecting the thermal performance of mixed coke by using a coke reactivity measuring device, which simulates the dissolution loss reaction process of the mixed coke in a blast furnace under the laboratory condition by using the coke reactivity measuring device to obtain the relation between the reactivity index and the strength index after reaction and the reaction time and the dissolution loss degree of the mixed coke, and also obtains the relation between the thermal performance index of the mixed coke and the thermal performance index of single coke, thereby providing reliable technical parameters for selecting the quality of the coke and determining the mixing proportion of the coke, being beneficial to the stable operation of the blast furnace and reducing the cost of the coke; a reasonable material distribution mode of coke mixing in a high-temperature reaction tube is provided, and the thermal performance of the coke mixing is detected by adopting a proper test method, so that the accurate measurement and evaluation of the thermal performance of the coke mixing are realized; a new test method with a plurality of temperature points and constant weight loss of 25% is provided, the method can more comprehensively represent the thermal performance of the mixed coke, particularly can clearly reflect the coupling effect among single cokes in the mixed coke, provides a new way for optimizing the coke structure for the blast furnace and reducing the coke cost for the blast furnace, and effectively solves the problems in the background art.
The technical scheme of the invention is as follows: the test method for detecting the coke mixing thermal performance by using the coke reactivity measuring device comprises the following components of a computer control software system, a high-temperature heating furnace, a high-temperature reaction tube, a thermocouple, an electronic balance, a temperature and reaction gas controller, a gas path connecting system, a CO2 gas and N2 gas high-pressure gas cylinder, and is characterized by comprising the following steps of:
the method comprises the following steps: mixing single coke samples with the particle size of 23 mm-25 mm according to the mass ratio of m1: m2: m3 ∙ ∙ ∙ ∙ ∙ ∙: mn (n represents the coke type and is one or more types of coke), wherein m1+ m2+ m3 ∙ ∙ ∙ ∙ ∙ ∙ + mn =200g, paving the spherical single coke samples in the inner cavity of the high-temperature reaction tube layer by layer at uniform intervals according to an insertion method, namely, the particle number of the single coke samples which can be paved on each layer of the inner cavity of the high-temperature reaction tube is calculated in advance, paving the single coke samples according to the circulation sequence of the coke types of 1, 2, 3 ∙ ∙ ∙ ∙ ∙ ∙ n, 1, 2 and 3 ∙ ∙ ∙ ∙ ∙ ∙ n, paving the bottommost layer firstly, and gradually upwards until all the coke samples are paved;
step two: and (3) conveying the high-temperature reaction pipe filled with the mixed coke into a high-temperature reaction furnace, and introducing N2 gas with the flow rate of 5L/min-10L/min to heat and protect the mixed coke sample and prevent air from entering. Electrifying a high-temperature reaction furnace for heating, controlling the target heating temperature to be 1050-1300 ℃, keeping the temperature for 10-20 min when the coke sample reaches the specified temperature, stabilizing the temperature field in the high-temperature reaction tube, introducing CO2 reaction gas, setting the gas outlet pressure to be a certain value within 0.2-1.0 MPa, setting the gas flow to be a certain value within 5-10L/min, controlling the reaction time to be 2h or controlling the weight loss rate of the coke sample to be 25%, recording the weight loss of the coke sample with the constant reaction time of 2h, or recording the reaction time with the weight loss rate of the constant coke sample to be 25%;
step three: when the reaction time is up, stopping heating, simultaneously closing a CO2 gas valve, opening an N2 gas valve, setting the N2 gas flow to be a certain value within 5L/min-10L/min, cooling the reacted coke sample in an inert atmosphere, and taking out the coke sample when the temperature of the reacted coke sample is reduced to room temperature;
step four: weighing the reacted mixed coke sample taken out from the third step, recording the mass as mt, then putting the weighed mixed coke sample into an I-type rotary drum, rotating at the rotating speed of 20r/min for 30min for 600r totally, then taking out the mixed coke sample, sieving by using a round hole sieve with the aperture of 10mm, and recording the mass mI of the mixed coke sample on the sieve;
step five: calculating the total weight loss rate or the average weight loss rate per minute in the reaction process according to the weight loss of the mixed coke sample recorded in the test process as the reactivity index of the mixed coke; and calculating according to the mass mt of the coke-mixed sample after reaction recorded after the reaction and the mass mI of the coke-mixed sample which is more than 10mm behind the rotary drum according to the formula mI/mt multiplied by 100 to obtain the strength index of the coke-mixed after reaction.
The single coke comprises one or more of top-loaded coke, stamp-charged coke, dry-quenched coke, wet-quenched coke, primary coke and secondary coke.
The single coke is mixed according to the mass ratio to obtain a mixed coke sample, the mass ratio is carried out in the following way, each coke is multiplied by the total mass of 200g according to the mixture ratio to obtain the mass of the single coke, the mass weighing error of the single coke is within +/-0.1 g, and the total mass of the mixed coke is controlled within +/-200 g +/-0.5 g.
The material is uniformly distributed layer by layer at intervals according to an inserting method, the material is firstly distributed from the center of the inner side of the circular high-temperature reaction tube, and the material is gradually distributed to the edge area according to the uniform distribution principle.
The reaction temperature is 1050-1300 ℃, and comprises 1050 ℃, 1100 ℃, 1150 ℃, 1200 ℃, 1250 ℃ and 1300 ℃ six typical temperature points.
The reaction time is controlled to be 2h, and the coke-mixed sample reacts with CO2 gas for 2h at 1100 ℃ according to the national standard method.
The reaction time is the reaction time for controlling the weight loss rate of the coke sample to be 25%, and the reaction is carried out on the coke-mixed sample and CO2 gas at six typical temperature points until the weight loss rate reaches 25% and the weight loss rate reaches 25%, which means that the total mass is 200g multiplied by 0.25=50 g.
The invention has the beneficial effects that: simulating the dissolution loss reaction process of the mixed coke in the blast furnace by using a coke reactivity measuring device under the laboratory condition to obtain the relationship between the reactivity index and the strength index after reaction of the mixed coke and the reaction time and the dissolution loss degree, and simultaneously obtaining the relationship between the thermal performance index of the mixed coke and the thermal performance index of a single coke, thereby providing reliable technical parameters for coke quality selection and coke blending ratio determination, being beneficial to stable operation of the blast furnace and reduction of coke cost; a reasonable material distribution mode of coke mixing in a high-temperature reaction tube is provided, and the thermal performance of the coke mixing is detected by adopting a proper test method, so that the accurate measurement and evaluation of the thermal performance of the coke mixing are realized; a new test method with a plurality of temperature points and constant weight loss of 25% is provided, the method can more comprehensively represent the thermal performance of the mixed coke, particularly can clearly reflect the coupling effect among single cokes in the mixed coke, and provides a new way for optimizing the coke structure for the blast furnace and reducing the coke cost for the blast furnace.
Drawings
FIG. 1 is a flow chart of the assay method of the present invention;
FIG. 2 is a schematic view of the structure of a coke reactivity measuring apparatus;
FIG. 3 is a schematic diagram of a method for distributing the coke in the high-temperature reaction tube;
in the figure: a computer control software system 1, a high-temperature heating furnace 2, a high-temperature reaction tube 3, a thermocouple 4 and an electronic balance 5.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the following will clearly and completely describe the technical solutions of the embodiments of the present invention with reference to the drawings of the embodiments, and it is obvious that the described embodiments are a small part of the embodiments of the present invention, rather than all embodiments, and all other embodiments obtained by a person of ordinary skill in the art without creative work based on the embodiments of the present invention belong to the protection scope of the present invention.
The test method for detecting the coke mixing thermal performance by using the coke reactivity measuring device comprises the following components of a computer control software system, a high-temperature heating furnace, a high-temperature reaction tube, a thermocouple, an electronic balance, a temperature and reaction gas controller, a gas path connecting system, a CO2 gas and N2 gas high-pressure gas cylinder, and is characterized by comprising the following steps of:
the method comprises the following steps: mixing single coke samples with the particle size of 23 mm-25 mm according to the mass ratio of m1: m2: m3 ∙ ∙ ∙ ∙ ∙ ∙: mn (n represents the coke type and is one or more types of coke), wherein m1+ m2+ m3 ∙ ∙ ∙ ∙ ∙ ∙ + mn =200g, paving the spherical single coke samples in the inner cavity of the high-temperature reaction tube layer by layer at uniform intervals according to an insertion method, namely, the particle number of the single coke samples which can be paved on each layer of the inner cavity of the high-temperature reaction tube is calculated in advance, paving the single coke samples according to the circulation sequence of the coke types of 1, 2, 3 ∙ ∙ ∙ ∙ ∙ ∙ n, 1, 2 and 3 ∙ ∙ ∙ ∙ ∙ ∙ n, paving the bottommost layer firstly, and gradually upwards until all the coke samples are paved;
step two: and (3) conveying the high-temperature reaction pipe filled with the mixed coke into a high-temperature reaction furnace, and introducing N2 gas with the flow rate of 5L/min-10L/min to heat and protect the mixed coke sample and prevent air from entering. Electrifying a high-temperature reaction furnace for heating, controlling the target heating temperature to be 1050-1300 ℃, keeping the temperature for 10-20 min when the coke sample reaches the specified temperature, stabilizing the temperature field in the high-temperature reaction tube, introducing CO2 reaction gas, setting the gas outlet pressure to be a certain value within 0.2-1.0 MPa, setting the gas flow to be a certain value within 5-10L/min, controlling the reaction time to be 2h or controlling the weight loss rate of the coke sample to be 25%, recording the weight loss of the coke sample with the constant reaction time of 2h, or recording the reaction time with the weight loss rate of the constant coke sample to be 25%;
step three: when the reaction time is up, stopping heating, simultaneously closing a CO2 gas valve, opening an N2 gas valve, setting the N2 gas flow to be a certain value within 5L/min-10L/min, cooling the reacted coke sample in an inert atmosphere, and taking out the coke sample when the temperature of the reacted coke sample is reduced to room temperature;
step four: weighing the reacted mixed coke sample taken out from the third step, recording the mass as mt, then putting the weighed mixed coke sample into an I-type rotary drum, rotating at the rotating speed of 20r/min for 30min for 600r totally, then taking out the mixed coke sample, sieving by using a round hole sieve with the aperture of 10mm, and recording the mass mI of the mixed coke sample on the sieve;
step five: calculating the total weight loss rate or the average weight loss rate per minute in the reaction process according to the weight loss of the mixed coke sample recorded in the test process as the reactivity index of the mixed coke; and calculating according to the mass mt of the coke-mixed sample after reaction recorded after the reaction and the mass mI of the coke-mixed sample which is more than 10mm behind the rotary drum according to the formula mI/mt multiplied by 100 to obtain the strength index of the coke-mixed after reaction.
The single coke comprises one or more of top-loaded coke, stamp-charged coke, dry-quenched coke, wet-quenched coke, primary coke and secondary coke.
The single coke is mixed according to the mass ratio to obtain a mixed coke sample, the mass ratio is carried out in the following way, each coke is multiplied by the total mass of 200g according to the mixture ratio to obtain the mass of the single coke, the mass weighing error of the single coke is within +/-0.1 g, and the total mass of the mixed coke is controlled within +/-200 g +/-0.5 g.
The material is uniformly distributed layer by layer at intervals according to an inserting method, the material is firstly distributed from the center of the inner side of the circular high-temperature reaction tube, and the material is gradually distributed to the edge area according to the uniform distribution principle.
The reaction temperature is 1050-1300 ℃, and comprises 1050 ℃, 1100 ℃, 1150 ℃, 1200 ℃, 1250 ℃ and 1300 ℃ six typical temperature points.
The reaction time is controlled to be 2h, and the coke-mixed sample reacts with CO2 gas for 2h at 1100 ℃ according to the national standard method.
The reaction time is the reaction time for controlling the weight loss rate of the coke sample to be 25%, and the reaction is carried out on the coke-mixed sample and CO2 gas at six typical temperature points until the weight loss rate reaches 25% and the weight loss rate reaches 25%, which means that the total mass is 200g multiplied by 0.25=50 g.
The coke reactivity measuring apparatus in the examples was purchased from Liaoning university of science and technology, model WC-100.
Example 1
A test method for detecting the thermal performance of coke mixture by using a coke reactivity measuring device is disclosed, wherein the coke reactivity measuring device has a structure shown in figure 2 and comprises a computer control software system 1, a high-temperature heating furnace 2, a high-temperature reaction tube 3, a thermocouple 4, an electronic balance 5, a temperature and reaction gas controller, a gas path connecting system, CO2Gas and N2A gas cylinder for high pressure gas comprising the steps of:
the method comprises the following steps: selecting two cokes A and B for mixing, processing A, B two cokes into spherical samples with the diameter of 23-25 mm, and mixing in three proportions, namely weighing 160g of the coke A and 40g of the coke B respectively for the mixed samples with the ratio of 8:2, 7:3 and 6:4, and weighing 140g of the coke A and 60g of the coke B respectively for the mixed samples with the ratio of 7:3, weighing 120g of the coke A and 80g of the coke B respectively for the mixed samples with the ratio of 6:4, wherein the mass of the mixed samples is controlled to be 200 g. A, B two kinds of cokes are sequentially and uniformly laid in the inner cavity of the high-temperature reaction tube 3 according to an inserting method, the bottommost layer is laid firstly, the inserting sequence is calculated according to the proportioning quality, the bottom layer is fully laid, and then the second layer is laid until A, B two kinds of cokes are used up;
step two: after the coke mixture sample is loaded, the high-temperature reaction tube 3 is sent into a high-temperature reaction furnace 2, and N of 5L/min is introduced2Protecting a coke sample by gas, then electrifying and heating the high-temperature reaction furnace 2, keeping the temperature for 10min when the temperature of the sample reaches 1100 ℃, stabilizing the temperature field in the high-temperature reaction tube 3, and then introducing CO with the flow rate of 5L/min2Gas, the gas outlet pressure is ensured to be 0.5 Mpa. When the electronic balance 5 has weightlessness parameters, starting to record the reaction time, and controlling the total reaction time to be 2 h;
step three: when the specified reaction time of 2h is reached, the heating is stopped and the CO is turned off2Gas valve, open N2A gas valve for introducing N with the flow rate of 5L/min2Protecting the gas until the temperature of the mixed coke sample is reduced to room temperature, and taking out the mixed coke sample;
step four: weighing the mass of the reacted coke mixture sample taken out of the third step and recording the mass as mtThen putting the weighed coke mixture sample into an I-shaped rotary drum, rotating at the rotating speed of 20r/min for 30min for 600r, taking out the coke mixture sample, sieving by using a circular sieve with the aperture of 10mm, and recording the mass m of the coke mixture sample on the sieveI；
Step five: calculating the total weight loss rate (m) of the reaction process according to the recorded weight loss of the mixed coke sample in the test processtPer 200 × 100 as reactivity index CRI of mixed cokeMixing of(ii) a According to the recorded mass m of the coke-mixed sample after reactiontMass m of coke-mixed sample larger than 10mm after drum mixingIAccording to mI/mt× 100 formula to obtain the post-reaction strength index CSR of the mixed cokeMixing of。
The national standard thermal property reactivity CRI index and the post-reaction strength CSR index of A, B two cokes adopted in the embodiment are shown in table 1, and the actually detected and mathematically three-proportioned mixed coke thermal property index CRI according to the thermal property index of a single cokeMix-true、CSRMix-trueAnd CRIMix-theory of drugs、CSRMix-theory of drugsSee table 2:
TABLE 1 thermal Properties of Individual cokes
Table 2 measured and calculated thermal performance index of blended coke according to single coke theory
Example 2
A test method for detecting the thermal performance of coke mixture by using a coke reactivity measuring device is disclosed, wherein the coke reactivity measuring device has a structure shown in figure 2 and comprises a computer control software system 1, a high-temperature heating furnace 2, a high-temperature reaction tube 3, a thermocouple 4, an electronic balance 5, a temperature and reaction gas controller, a gas path connecting system, CO2Gas and N2A gas cylinder for high pressure gas comprising the steps of:
the method comprises the following steps: selecting two cokes C and D for mixing, processing the C, D cokes into spherical samples with the diameter of 23-25 mm, and mixing in two proportions, namely weighing 140g of the C coke and 60g of the D coke respectively for the mixed samples with the ratio of 7:3 and 5:5 and 7:3, weighing 100g of the A coke and 100g of the B coke respectively for the mixed samples with the ratio of 5:5, wherein the mass of the mixed sample is controlled to be 200 g. C, D two kinds of cokes are sequentially and uniformly laid in the inner cavity of the high-temperature reaction tube 3 according to an inserting method, the bottommost layer is laid firstly, the inserting sequence is calculated according to the proportion quality, the bottom layer is fully laid, and then the second layer is laid until C, D two kinds of cokes are used up. Preparing six groups of coke-mixed samples to be detected in each proportion;
step two: after the coke mixture sample is loaded, the high-temperature reaction tube 3 is sent into a high-temperature reaction furnace 2, and N of 5L/min is introduced2Protecting the coke sample by gas, then electrifying and heating the high-temperature reaction furnace 2, keeping the temperature for 10min when the sample temperature reaches the specified temperature (the target temperatures of six groups of coke-mixed samples to be detected are different and are 1050 ℃, 1100 ℃, 1150 ℃, 1200 ℃, 1250 ℃ and 1300 ℃), and enabling the high-temperature reaction tubes to be in a constant temperature state3, the temperature field is stabilized, and then CO with the flow rate of 5L/min is introduced2Gas, the gas outlet pressure is ensured to be 0.5 Mpa. When the electronic balance 5 has weightlessness parameters, starting to record the reaction time, and controlling the total weightlessness rate of the mixed coke sample to be 25 percent, namely the total weightlessness reaches 50 g;
step three: when the specified weight loss of 25% is reached, the heating is stopped and the CO is turned off2Gas valve, open N2A gas valve for introducing N with the flow rate of 5L/min2Protecting the gas until the temperature of the mixed coke sample is reduced to room temperature, and taking out the mixed coke sample;
step four: weighing the mass of the reacted coke mixture sample taken out of the third step and recording the mass as mtThen putting the weighed coke mixture sample into an I-shaped rotary drum, rotating at the rotating speed of 20r/min for 30min for 600r, taking out the coke mixture sample, sieving by using a circular sieve with the aperture of 10mm, and recording the mass m of the coke mixture sample on the sieveI；
Step five: according to the recorded mass m of the coke-mixed sample after reactiontMass m of coke-mixed sample larger than 10mm after drum mixingIAccording to mI/mt× 100 formula to obtain the post-reaction strength index CSR of the mixed coke25-mix。
Post-reaction intensity CSR of C, D two individual cokes used in this example25The indexes are shown in a table 3, and the actual detection result and the mathematical calculation result according to the thermal performance index of the single coke are used for obtaining the mixed coke thermal performance index CSR of two proportions25 mix-trueAnd CSR25 mixing and treatingSee table 4:
TABLE 3 thermal Properties of Individual cokes
TABLE 4 measured and calculated thermal performance index of blended coke according to single coke theory
By way of exampleComparison of the data in tables 1 and 2 in Table 1 reveals that the reactive CRI calculated from the coke mixing theory with coke ratios of 8:2 and 7:3 for A and BMix-theory of drugsIndex and actually detected reactive CRIMix-trueThe index difference is large, and the post-reaction strength CSR calculated by the coke mixing theory of the coke mixture ratio of A to B being 8:2 and 6:4Mix-theory of drugsIndex and post-reaction intensity CSR obtained by actual detectionMix-trueThe index difference is large; comparison of the data in Table 3 and Table 4 in example 2 shows that the coke mixture ratio of C and D is 7:3, and that the post-reaction strength CSR obtained by theoretical calculation of the coke mixture at multiple temperature points (1150 ℃, 1200 ℃, 1250 ℃ and 1300 ℃) is obtained25 mixing and treatingIndex and post-reaction intensity CSR obtained by actual detection25 mix-trueThe index difference is large. The mixed coke with the coke ratio of 5:5 is subjected to theoretical calculation at multiple temperature points (1250 ℃ and 1300 ℃) to obtain post-reaction strength CSR25 mixing and treatingIndex and post-reaction intensity CSR obtained by actual detection25 mix-trueThe index difference is also large. The comparison of the data of the two embodiments of the invention shows that the thermal performance index of the mixed coke obtained by adopting a mathematical method according to the theoretical calculation of the thermal performance index of the single coke is greatly deviated from the actual index value actually measured by experiments under many conditions, and the theoretical value is adopted to evaluate the thermal performance of the mixed coke, so that misjudgment and misguidance of the blast furnace operation on the quality of the mixed coke can be caused, and further, the adverse effect on the blast furnace smelting can be caused. From example 2, the thermal performance indexes of the coke used in blending are higher than theoretical values under the condition of a plurality of temperature points, which provides a new effective way for optimizing the coke structure of the blast furnace and reducing the coke production cost.
Claims (7)
1. The test method for detecting the coke mixing thermal performance by using the coke reactivity measuring device comprises the following components of a computer control software system, a high-temperature heating furnace, a high-temperature reaction tube, a thermocouple, an electronic balance, a temperature and reaction gas controller, a gas path connecting system, a CO2 gas and N2 gas high-pressure gas cylinder, and is characterized by comprising the following steps of:
the method comprises the following steps: mixing single coke samples with the particle size of 23 mm-25 mm according to the mass ratio of m1: m2: m3 ∙ ∙ ∙ ∙ ∙ ∙: mn, wherein n represents the kind of coke and is one or more kinds of coke; wherein m1+ m2+ m3 ∙ ∙ ∙ ∙ ∙ ∙ + mn =200g, spherical single coke samples are uniformly paved in the inner cavity of the high-temperature reaction tube layer by layer at intervals according to a plugging method, namely, the plugging method is that the grain number of the single coke samples paved on each layer of the inner cavity of the high-temperature reaction tube is calculated in advance, the paving is carried out according to the circulation sequence of coke types 1, 2, 3 ∙ ∙ ∙ ∙ ∙ ∙ n, 1, 2 and 3 ∙ ∙ ∙ ∙ ∙ ∙ n, the bottommost layer is paved firstly, and gradually upwards until all the coke is paved;
step two: sending the high-temperature reaction tube filled with the mixed coke into a high-temperature reaction furnace, and introducing N2 gas with the flow rate of 5L/min-10L/min to heat and protect the mixed coke sample and prevent air from entering;
electrifying a high-temperature reaction furnace for heating, controlling the target heating temperature to be 1050-1300 ℃, keeping the temperature for 10-20 min when the coke sample reaches the specified temperature, stabilizing the temperature field in the high-temperature reaction tube, introducing CO2 reaction gas, setting the gas outlet pressure to be a certain value within 0.2-1.0 MPa, setting the gas flow to be a certain value within 5-10L/min, controlling the reaction time to be 2h or controlling the weight loss rate of the coke sample to be 25%, recording the weight loss of the coke sample with the constant reaction time of 2h, or recording the reaction time with the weight loss rate of the constant coke sample to be 25%;
step three: when the reaction time is up, stopping heating, simultaneously closing a CO2 gas valve, opening an N2 gas valve, setting the N2 gas flow to be a certain value within 5L/min-10L/min, cooling the reacted coke sample in an inert atmosphere, and taking out the coke sample when the temperature of the reacted coke sample is reduced to room temperature;
step four: weighing the reacted mixed coke sample taken out from the third step, recording the mass as mt, then putting the weighed mixed coke sample into an I-type rotary drum, rotating at the rotating speed of 20r/min for 30min for 600r totally, then taking out the mixed coke sample, sieving by using a round hole sieve with the aperture of 10mm, and recording the mass mI of the mixed coke sample on the sieve;
step five: calculating the total weight loss rate or the average weight loss rate per minute in the reaction process according to the weight loss of the mixed coke sample recorded in the test process as the reactivity index of the mixed coke; and calculating according to the mass mt of the coke-mixed sample after reaction recorded after the reaction and the mass mI of the coke-mixed sample which is more than 10mm behind the rotary drum according to the formula mI/mt multiplied by 100 to obtain the strength index of the coke-mixed after reaction.
2. The method of claim 1, wherein the method comprises the steps of: the single coke comprises one or more of top-loaded coke, stamp-charged coke, dry-quenched coke, wet-quenched coke, primary coke and secondary coke.
3. The method of claim 1, wherein the method comprises the steps of: the single coke is mixed according to the mass ratio to obtain a mixed coke sample, the mass ratio is carried out in the following way, each coke is multiplied by the total mass of 200g according to the mixture ratio to obtain the mass of the single coke, the mass weighing error of the single coke is within +/-0.1 g, and the total mass of the mixed coke is controlled within +/-200 g +/-0.5 g.
4. The method of claim 1, wherein the method comprises the steps of: the material is uniformly distributed layer by layer at intervals according to an inserting method, the material is firstly distributed from the center of the inner side of the circular high-temperature reaction tube, and the material is gradually distributed to the edge area according to the uniform distribution principle.
5. The method of claim 1, wherein the method comprises the steps of: the reaction temperature is 1050-1300 ℃, and comprises 1050 ℃, 1100 ℃, 1150 ℃, 1200 ℃, 1250 ℃ and 1300 ℃ six typical temperature points.
6. The method of claim 1, wherein the method comprises the steps of: the reaction time is controlled to be 2h, and the coke-mixed sample reacts with CO2 gas for 2h at 1100 ℃ according to the national standard method.
7. The method of claim 5, wherein the method comprises the steps of: the reaction time is the reaction time for controlling the weight loss rate of the coke sample to be 25%, and the reaction is carried out on the coke-mixed sample and CO2 gas at six typical temperature points until the weight loss rate reaches 25% and the weight loss rate reaches 25%, which means that the total mass is 200g multiplied by 0.25=50 g.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112903513A (en) * | 2021-01-13 | 2021-06-04 | 东北大学 | Method for measuring high-temperature pulverization performance of iron coke |
| CN114002054A (en) * | 2021-11-05 | 2022-02-01 | 西安建筑科技大学 | Method for measuring and evaluating high-temperature performance of coke for blast furnace iron making |
Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101775624A (en) * | 2010-01-26 | 2010-07-14 | 云南源鑫炭素有限公司 | Petroleum coke homogenizing method for aluminium electrolysis prebaked anode |
| CN101825548A (en) * | 2010-04-28 | 2010-09-08 | 辽宁科技大学 | Detection method and device of coke reactivity and post-reaction heat-treatability |
| CN101928823A (en) * | 2009-06-22 | 2010-12-29 | 鞍钢股份有限公司 | Sintering method of iron ore powder with high content of crystal water |
| CN101936979A (en) * | 2009-06-30 | 2011-01-05 | 宝山钢铁股份有限公司 | Strength determination method and device for reacted blast furnace coke |
| CN104140832A (en) * | 2013-05-10 | 2014-11-12 | 山东钢铁集团日照有限公司 | Technology for improving quality stability of coking charge coal |
| KR20160072665A (en) * | 2014-12-15 | 2016-06-23 | 주식회사 포스코 | Method for sample quality prediction and Method for forecasting CSR(Coke Strength Reaction) |
| CN107764681A (en) * | 2017-10-16 | 2018-03-06 | 深圳市贝特瑞新能源材料股份有限公司 | A kind of fast appraisement method of burnt raw material |
| CN108106961A (en) * | 2016-11-25 | 2018-06-01 | 上海梅山钢铁股份有限公司 | A kind of detection method of blast furnace ironmaking coke reactivity |
| CN108593700A (en) * | 2018-05-11 | 2018-09-28 | 武汉钢铁有限公司 | It is a kind of simulation coke blast furnace melting with soft deterioration process test method and simulator |
| JP2019007943A (en) * | 2017-06-20 | 2019-01-17 | 新日鐵住金株式会社 | Estimation method of coke strength |
| CN109706277A (en) * | 2019-03-01 | 2019-05-03 | 武汉钢铁有限公司 | Application method of the coke of different initial reaction temperatures in blast furnace |
-
2020
- 2020-04-24 CN CN202010334169.6A patent/CN111595718A/en active Pending
Patent Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101928823A (en) * | 2009-06-22 | 2010-12-29 | 鞍钢股份有限公司 | Sintering method of iron ore powder with high content of crystal water |
| CN101936979A (en) * | 2009-06-30 | 2011-01-05 | 宝山钢铁股份有限公司 | Strength determination method and device for reacted blast furnace coke |
| CN101775624A (en) * | 2010-01-26 | 2010-07-14 | 云南源鑫炭素有限公司 | Petroleum coke homogenizing method for aluminium electrolysis prebaked anode |
| CN101825548A (en) * | 2010-04-28 | 2010-09-08 | 辽宁科技大学 | Detection method and device of coke reactivity and post-reaction heat-treatability |
| CN104140832A (en) * | 2013-05-10 | 2014-11-12 | 山东钢铁集团日照有限公司 | Technology for improving quality stability of coking charge coal |
| KR20160072665A (en) * | 2014-12-15 | 2016-06-23 | 주식회사 포스코 | Method for sample quality prediction and Method for forecasting CSR(Coke Strength Reaction) |
| CN108106961A (en) * | 2016-11-25 | 2018-06-01 | 上海梅山钢铁股份有限公司 | A kind of detection method of blast furnace ironmaking coke reactivity |
| JP2019007943A (en) * | 2017-06-20 | 2019-01-17 | 新日鐵住金株式会社 | Estimation method of coke strength |
| CN107764681A (en) * | 2017-10-16 | 2018-03-06 | 深圳市贝特瑞新能源材料股份有限公司 | A kind of fast appraisement method of burnt raw material |
| CN108593700A (en) * | 2018-05-11 | 2018-09-28 | 武汉钢铁有限公司 | It is a kind of simulation coke blast furnace melting with soft deterioration process test method and simulator |
| CN109706277A (en) * | 2019-03-01 | 2019-05-03 | 武汉钢铁有限公司 | Application method of the coke of different initial reaction temperatures in blast furnace |
Non-Patent Citations (4)
| Title |
|---|
| 冯正等: "混合焦等反应性下的热性质变化规律研究", 《安徽工业大学学报(自然科学版)》 * |
| 吴胜利等: "焦炭反应性对高炉块状带含铁炉料还原的影响", 《北京科技大学学报》 * |
| 张前香等: "焦炭反应性及反应后强度试验方法", 《中华人民共和国国家标准GB/T 4000-2008》 * |
| 张小勇等: "混合焦等温热反应性的变化规律", 《煤炭转化》 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112903513A (en) * | 2021-01-13 | 2021-06-04 | 东北大学 | Method for measuring high-temperature pulverization performance of iron coke |
| CN114002054A (en) * | 2021-11-05 | 2022-02-01 | 西安建筑科技大学 | Method for measuring and evaluating high-temperature performance of coke for blast furnace iron making |
| CN114002054B (en) * | 2021-11-05 | 2023-12-22 | 西安建筑科技大学 | Method for measuring and evaluating high-temperature performance of coke for blast furnace ironmaking |
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