CN113970501A - Method for evaluating reaction performance of carbon-iron composite furnace charge - Google Patents
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Abstract
The invention discloses a method for evaluating the reaction performance of a carbon-iron composite furnace charge, which comprises the following steps: 1. drying the carbon-iron composite furnace burden; 2. sampling the material (8), testing the carbon content of the material before reaction and filling the material into a reaction tank (4); 3. a temperature thermocouple (9) is inserted into the material of the reaction tank, and the reaction tank is suspended in a corundum tube (6) in a heating furnace (7) through a high-temperature thermobalance (12); 4. heating the materials in sections and introducing gas; 5. cutting off the power supply after the reaction is finished, ventilating the reaction tank, moving out of the reaction tank, and cooling in the air; 6. after the material is cooled to normal temperature, stopping ventilation, pouring out and testing the weight and the carbon content of the material, and obtaining the weight and the carbon content of the material through a formula
Calculating the reactivity CRI of the carbon-iron composite furnace chargeC. The invention utilizes the component characteristics of the carbon-iron composite furnace charge, can accurately and truly react the reaction performance of the carbon-iron composite furnace charge by controlling the temperature and the atmosphere of the high-temperature reaction furnace, and ensures the environmental benefit and the economic benefit of the blast furnace production.
Description
Technical Field
The invention relates to a method for testing and evaluating the performance of blast furnace materials, in particular to a method for evaluating the reaction performance of a carbon-iron composite furnace charge.
Background
With the development of society and the progress of technology, China becomes a major steel production country with the first steel production capacity in the world, the steel production is ranked first in the world, high requirements are put forward on the quality and quantity of coke which is a necessary raw material for iron making, and as coking coal resources are non-renewable energy, the coking coal resources are less and less along with the large consumption of the coking coal resources, and particularly, the high-quality coking coal resources are gradually exhausted.
Researches show that iron element and alkali metal element compounds have positive catalytic action on coke gasification reaction and promote the generation of CO in a blast furnace, so that the reaction of coke and ore in the blast furnace can be promoted, the coke can be used as a raw material for refining high-reaction coke, and according to the Rist operating line principle, the high-reactivity coke can reduce the temperature of a hot storage area of the blast furnace, improve the reduction efficiency of a furnace body, improve the utilization rate of coal gas and improve the reduction degree of the ore, so that the coke ratio and the production cost of the blast furnace are reduced, so that the reaction performance of blast furnace burden needs to be accurately evaluated, especially the blast furnace burden containing iron element and compounds thereof.
The Chinese invention patent ZL201210209740.7 discloses a method for measuring the high temperature performance of coke, which comprises the steps of putting a coke sample of 19-21mm into a furnace for high temperature treatment, adopting a sectional heating mode in the heating process, wherein the heating speed of each section is different, utilizing nitrogen protection in the heating process, and evaluating the weight loss and the drum strength conditions when the heating end temperature reaches 1400-1600 ℃ and the constant temperature is required for 2 hours after the heating end temperature is reached. The patent is mainly used for evaluating the high temperature resistance of the coke, and is a physical change process of the coke, but the patent cannot be used for evaluating the reaction performance of the coke in a blast furnace.
Chinese invention patent CN200810201581.X discloses a method for measuring high temperature expansion performance of coke, which mainly studies the thermal expansion performance of different coke before 1300 ℃, prepares coke samples into cylinders with the length of 10mm and the diameter of 7.5mm, heats the coke samples to 1100 ℃ in 200g sample tanks, and then introduces CO2Reacting for 2h at constant temperature, and losing weight through the sample after reactionTo measure reactivity, the post-reaction strength was measured after drum rotation. The gas environment to which the coke is actually subjected in the blast furnace is not only CO2And also CO, H2And N2The method can not truly reflect the heating and reaction environment of the coke in the blast furnace and the performance change condition of the metallurgical coke; particularly, since the high-reaction coke contains iron oxide, the iron oxide can react during heating, so that the method is not suitable for evaluating the reaction performance of the high-reactivity carbon-iron composite furnace charge.
Disclosure of Invention
The invention aims to provide a method for evaluating the reaction performance of a carbon-iron composite furnace charge, which can accurately and truly react the reaction performance of the carbon-iron composite furnace charge by utilizing the component characteristics of the carbon-iron composite furnace charge and controlling the temperature and the atmosphere of a high-temperature reaction furnace, thereby ensuring the environmental benefit and the economic benefit of blast furnace production.
The invention is realized by the following steps:
a reaction performance evaluation method of a carbon-iron composite furnace charge comprises the following steps that the carbon-iron composite furnace charge is heated by a high-temperature reaction device, and the high-temperature reaction device comprises a heating furnace with a corundum tube arranged inside, a high-temperature thermal balance used for hanging a reaction tank and measuring the weight of the reaction tank, a gas cylinder connected with the reaction tank, a corundum ball and a temperature thermocouple;
the reaction performance evaluation method comprises the following steps:
step 1: carrying out ventilation drying on the carbon-iron composite furnace burden;
step 2: weighing the carbon-iron composite furnace burden, sampling the material, testing the carbon content in the material before reaction, and filling the material into a reaction tank;
and step 3: inserting a temperature thermocouple into the reaction tank, inserting the temperature thermocouple into the material, and suspending the reaction tank in a corundum tube in a heating furnace through a high-temperature thermobalance;
and 4, step 4: the heating furnace carries out sectional heating on the materials in the reaction tank, and gas is introduced in the heating process;
and 5: cutting off the power supply after the reaction is finished, ventilating the reaction tank, and simultaneously moving the reaction tank out of the heating furnace to cool the reaction tank in the air;
step 6: after the material is cooled to normal temperature, stopping ventilation, pouring out the material, testing the weight and the carbon content of the material, and calculating the reactivity CRI of the carbon-iron composite furnace chargeCThe calculation formula is as follows:
wherein m is0M is the weight of the material before reaction1Is the weight of the reacted material, c0Is the carbon content of the material before reaction, c1Is the carbon content in the reacted material.
The content of iron ore powder in the carbon-iron composite furnace charge is 0.5-35%.
The granularity of the carbon-iron composite furnace charge is 15-25 mm; the moisture content of the carbon-iron composite furnace charge after ventilation drying is less than 1 percent.
A plurality of corundum balls are paved at the bottom of the reaction tank, and the materials are uniformly distributed above the corundum balls.
The measuring end of the temperature thermocouple is positioned at the center of the material, and the temperature thermocouple is externally connected to the computer through the temperature controller.
The step 4 further comprises:
step 4.1: a first heating stage: heating the reaction tank from room temperature to a first temperature threshold value, and introducing nitrogen into the reaction tank while heating;
step 4.2: a second heating stage: heating the reaction tank from a first heating threshold value to a second heating threshold value, and introducing CO and CO into the reaction tank while heating2The mixed gas of (3);
step 4.3: a third heating stage: heating the reaction tank from the second temperature threshold to a third temperature threshold, and introducing CO and CO into the reaction tank while heating2The mixed gas of (3);
step 4.4: a fourth heating stage: heating the reaction tank from the third temperature threshold to the fourth temperature threshold, and introducing CO and CO into the reaction tank while heating2The mixed gas of (3);
step 4.5: continuing to react for 10-15min at the fourth temperature threshold, and stopping introducing CO and CO2The mixed gas of (1).
In the first heating stage, the introduction speed of nitrogen is 1-1.5L/min, the first temperature threshold is 100 ℃, and the heating speed in the first heating stage is 10 ℃/min;
in said second heating stage, CO and CO2The feeding speed of the first heating stage is 5L/min, the second temperature threshold is 900 ℃, and the heating speed of the second heating stage is 10 ℃/min;
in the third heating stage, the introduction speed of CO is 7.5L/min, and CO is introduced into the reactor2The introduction speed of (2.5) is 2.5L/min, the third temperature threshold is 1100 ℃, and the heating speed of the third heating stage is 4 ℃/min;
in the fourth heating stage, the introduction speed of CO is 9L/min, and CO is introduced into the furnace2The introduction speed of (2) is 1L/min, the fourth temperature threshold is 1200 ℃, and the heating speed of the fourth heating stage is 4 ℃/min.
In the step 4, the gas is introduced into the bottom of the reaction tank through the flowmeter, and is dispersed by a plurality of corundum balls and then contacts with the material.
And in the step 5, the gas introduced into the reaction tank is nitrogen, and the nitrogen is introduced into the bottom of the reaction tank through a flowmeter and is dispersed by a plurality of corundum balls and then is contacted with the material.
Compared with the prior art, the invention has the following beneficial effects:
1. the invention heats the carbon-iron composite furnace charge in sections, each section of heating adopts different heating speed and reaction gas, thereby simulating the reaction atmosphere and environment at the upper part of the blast furnace, and continuously reacting for 10-15min after reaching the set temperature, avoiding the hysteresis possibly existing in the reaction process, and being capable of more truly and accurately reacting the reaction performance of the carbon-iron composite furnace charge.
2. The method evaluates the reaction performance of the carbon-iron composite furnace charge through the loss of the carbon content in the materials before and after the reaction, and has higher accuracy compared with the method for evaluating the reaction performance of the furnace charge through the weight loss in the reaction process in the prior art.
3. By the evaluation of the invention which is larger than the reaction performance of the carbon-iron composite furnace charge, the high-reaction carbon-iron composite furnace charge is applied to blast furnace production, the reduction efficiency of a furnace body can be improved, the utilization rate of coal gas is improved, the generation of CO reduction gas is promoted, the yield of molten iron can be partially improved, and CO in the coking process and the iron-making process is reduced2The discharge is realized, so that the proportion of coke consumed by the blast furnace is reduced, the aim of reducing the production cost of blast furnace ironmaking is fulfilled, and the method has good environmental benefit and economic benefit.
The invention utilizes the component characteristics of the carbon-iron composite furnace charge, and can accurately and truly react the reaction performance of the carbon-iron composite furnace charge by controlling the temperature and the atmosphere of the high-temperature reaction furnace, thereby partially replacing coking coal resources by the high-reaction carbon-iron composite furnace charge and ensuring the environmental benefit and the economic benefit of blast furnace production.
Drawings
FIG. 1 is a flow chart of the method for evaluating the reaction performance of the carbon-iron composite charge material according to the present invention;
FIG. 2 is a schematic structural diagram of a high-temperature reaction apparatus used in the method for evaluating the reaction performance of a carbon-iron composite charge according to the present invention.
In the figure, 1 CO gas cylinder, 2 CO2Gas cylinder, 3N2The device comprises a gas cylinder, a 4 reaction tank, 5 corundum balls, 6 corundum tubes, 7 heating furnaces, 8 materials, 9 temperature measuring thermocouples, 10 temperature controllers, 11 computers, 12 high-temperature thermobalances and 13 flow meters.
Detailed Description
The invention is further described with reference to the following figures and specific examples.
A method for evaluating the reaction performance of a carbon-iron composite furnace charge is characterized in that the carbon-iron composite furnace charge is heated by a high-temperature reaction device, please refer to the attached figure 1, the high-temperature reaction device comprises a heating furnace 7 with a corundum tube 6 arranged inside, a reaction tank 4 suspended in the corundum tube 6 through a high-temperature thermal balance 12, and a gas cylinder connected to the bottom of the reaction tank 4 through a gas pipeline by a flowmeter 13A plurality of corundum balls 5 laid in the reaction tank 4, a temperature thermocouple 9 inserted in the reaction tank 4, and a temperature controller 10 connected with a computer 11 and the temperature thermocouple 9. The gas cylinder comprises a CO gas cylinder 1 for providing CO gas, a gas cylinder for providing CO2CO of gas2Gas cylinder 2 and N for supplying nitrogen2And a gas cylinder 3.
Referring to fig. 2, the reaction performance evaluation method includes the following steps:
step 1: and (4) carrying out ventilation drying on the carbon-iron composite furnace burden.
The content of iron ore powder in the carbon-iron composite furnace charge is 0.5-35%, and the granularity of the carbon-iron composite furnace charge is 15-25 mm.
The moisture content of the carbon-iron composite furnace charge after ventilation drying is less than 1%.
Step 2: weighing and sampling 300-400g of the material 8 from the carbon-iron composite furnace burden, measuring the carbon content in the material 8 before reaction, and filling the material into a reaction tank 4.
A plurality of corundum balls 5 are laid at the bottom of the reaction tank 4, the materials 8 are uniformly distributed above the corundum balls 5, the surfaces of the materials 8 are leveled as much as possible, and the reaction tank 4 is covered with a cover after the materials are installed.
And step 3: a thermocouple 9 is inserted into the reaction tank 4, the thermocouple 9 is inserted into the material 8, and the reaction tank 4 is suspended in the corundum tube 6 in the heating furnace 7 by a high-temperature thermobalance 12.
The depth of the temperature thermocouple 9 inserted into the material 8 is 100-150mm, so that the measuring end of the temperature thermocouple 9 is positioned at the center of the material 8 and is used for measuring the temperature of the center of the material 8.
Preferably, the reaction tank 4 can be suspended below the high temperature thermal balance 12 through a metal suspension wire, so that the high temperature thermal balance 12 can measure the weight of the material 8 in the reaction process in real time, and the purpose of monitoring the reaction process is achieved.
And 4, step 4: the heating furnace 7 carries out sectional heating on the materials 8 in the reaction tank 4, gas is introduced in the heating process, different heating temperature thresholds can be set and different types and flows of gas are introduced in different heating stages according to the components and characteristics of the actual mixed gas in the blast furnace, so that the reaction atmosphere and the environment on the upper part of the blast furnace can be simulated more accurately, and the reaction performance of the real reaction furnace burden is facilitated. In the whole heating process, the temperature thermocouple 9 can be connected to a computer 11 through a temperature controller 10, so that the temperature monitoring of each section of the heating process is realized.
Step 4.1: a first heating stage: the reaction tank 4 is heated from room temperature to a first temperature threshold, and nitrogen is introduced into the reaction tank 4 while heating, so as to protect the material 8 from reaction.
According to the environment of the charging materials in the blast furnace, preferably, in the first heating stage, the nitrogen gas is introduced at a speed of 1-1.5L/min, the nitrogen gas introduction speed can be controlled by a flow meter 13, the first temperature threshold is 100 ℃, and the heating speed in the first heating stage is 10 ℃/min.
Step 4.2: a second heating stage: heating the reaction tank 4 from the first heating threshold value to the second heating threshold value, and introducing CO and CO into the reaction tank 4 while heating2For simulating the blast furnace ambient atmosphere during this heating stage.
Depending on the environment in which the charge is located in the blast furnace, it is preferred that in the second heating stage, CO and CO2The introduction speed of (A) is 5L/min, and CO are2The rate of introduction of (d) can be controlled by means of a flow meter 13, the second temperature threshold being 900 ℃ and the heating rate in the second heating phase being 10 ℃/min.
Step 4.3: a third heating stage, heating the reaction tank 4 from the second temperature threshold to a third temperature threshold, and introducing CO and CO into the reaction tank 4 while heating2For simulating the blast furnace ambient atmosphere during this heating stage.
Preferably, in the third heating stage, the CO is introduced at a rate of 7.5L/min, depending on the environment of the charge in the blast furnace2The introduction rate of (2.5L/min), CO and CO2The rate of introduction of (d) can be controlled by means of a flow meter 13, the third temperature threshold being 1100 ℃, and the heating rate of the third heating stage being 4 ℃/min.
Step 4.4: a fourth heating stage of heating the reaction tank 4 from the third temperature threshold to a fourth temperature thresholdAnd introducing CO and CO into the reaction tank 4 while heating2For simulating the blast furnace ambient atmosphere during this heating stage.
Preferably, in the fourth heating stage, the CO is introduced at a rate of 9L/min according to the environment of the burden in the blast furnace2The introduction speed of (2) is 1L/min, CO and CO2The rate of introduction of (d) can be controlled by means of a flow meter 13, the fourth temperature threshold is 1200 ℃ and the heating rate in the fourth heating stage is 4 ℃/min.
Step 4.5: continuing to react for 10-15min at the fourth temperature threshold, and stopping introducing CO and CO2The mixed gas of (1).
The nitrogen or CO and CO2The mist let in the bottom of retort 4 through gas pipeline through flowmeter 13, gas lets in the back from retort 4 bottom, through the corundum ball 5 homodisperse that the multilayer was laid to can effectual and material 8 contact, make the reaction of material 8 more abundant, prevent that the channeling and short circuit phenomenon from taking place.
And 5: after the reaction is finished, the power supply is cut off, the reaction tank 4 is aerated, the reaction tank 4 is moved out of the heating furnace 7, the reaction tank 4 is cooled in the air, and the cover of the reaction tank 4 is not opened until the material 8 is cooled to the room temperature in the whole heating and cooling process.
The gas introduced into the reaction tank 4 is preferably nitrogen, and the nitrogen is introduced into the bottom of the reaction tank 4 through a flow meter 13, is dispersed by a plurality of corundum balls 5 and then is contacted with the material 8. Preferably, the nitrogen gas is introduced at a rate of 2 to 3L/min, which can be controlled by the flow meter 13.
Step 6: after the material 8 is cooled to the normal temperature, stopping ventilation, pouring out the material 8, testing the weight and the carbon content of the material 8, and calculating the reactivity CRI of the carbon-iron composite furnace chargeCThe calculation formula is as follows:
wherein m is0M is the weight of the pre-reaction mass 81Weight of reacted feed 8, c0To reactCarbon content in the precursor 8, c1Is the carbon content in the reacted mass 8.
Example 1:
and (3) carrying out ventilation drying on the carbon-iron composite furnace charge with the original content of iron ore powder of 0.5% and the particle size of 25mm until the moisture content of the material is less than 1%. Sample 400g (m)0) Material 8 and the carbon content c of Material 8 before reaction was measured099.2%, put into the retort 4 that has laid a certain amount of corundum balls 5 in the bottom with material 8, shake retort 4 after having adorned material 8 and make 8 surfaces of material smooth as far as possible, then install the lid at retort 4 top. A temperature thermocouple 9 is inserted into the top of the reaction tank 4, the depth of the temperature thermocouple 9 inserted into the material 8 is about 150mm, and the temperature thermocouple 9 is connected to a computer 11 through a temperature controller 10. The whole reaction tank 4 is placed in a corundum tube 6 in a heating furnace 7, and the metal suspension wires are suspended below a high-temperature thermobalance 12, so that the weight of the materials 8 in the reaction process can be conveniently measured, and the reaction process can be monitored. After the reaction tank 4 is in place, starting to perform programmed heating on the heating furnace 7, wherein the specific heating process is as follows: (1) in the first heating stage, the temperature is heated from room temperature to 100 ℃ at the speed of 10 ℃/min, and nitrogen of 1L/min is introduced in the process so as to protect the materials from reacting; (2) in the second heating stage, the temperature is increased from 100 ℃ to 900 ℃ at a rate of 10 ℃/min, and 5L/min CO and 5L/minCO are introduced in the process2The gas flow of the mixed gas is controlled by a flowmeter 13, and (3) in the third heating stage, the temperature is heated from 900 ℃ to 1100 ℃ at the speed of 4 ℃/min, and 7.5L/min CO and 2.5L/minCO are introduced in the process2The gas flow rate is controlled by a flow meter 13; (4) a fourth heating stage, heating from 1100 deg.C to 1200 deg.C at 4 deg.C/min, and introducing 9L/min CO and 1L/minCO2The gas flow rate is controlled by a flow meter 13; (5) after the temperature reaches 1200 ℃, the reaction is continued for 15min at the temperature, and the introduction of CO and CO is stopped2The mixed gas of (1). Cutting off the power supply, introducing 2L/min of nitrogen instead to facilitate cooling of the materials 8, and simultaneously removing the reaction tank 4 from the heating furnace 7, placing the reaction tank 4 in the air, and keeping the reaction tank 4 in a closed state. After the material 8 is cooled to normal temperature, stopping introducing the nitrogen gas, pouring out the material 8, and adjusting the weight of the material 8 and the carbon content in the material 8Quantity is tested, c1＝98.79％，m1292g, calculating the reactivity of the carbon-iron composite furnace charge according to the formula (1), and obtaining a calculation result: CRIC＝27.3％。
Example 2:
and (3) carrying out ventilation drying on the carbon-iron composite furnace charge with the original content of iron ore powder of 10% and the particle size of 20mm until the moisture content of the material is less than 1%. Sample 370g (m)0) Material 8 and measuring the carbon content of material 8 before reaction, c080.1%, put into the retort 4 that has laid a certain amount of corundum balls 5 in the bottom with material 8, shake retort 4 after having loaded material 8 and make 8 surfaces of material smooth as far as possible, then install the lid at retort 4 top. A temperature thermocouple 9 is inserted into the top of the reaction tank 4, the depth of the temperature thermocouple 9 inserted into the material 8 is about 130mm, and the temperature thermocouple 9 is connected to a computer 11 through a temperature controller 10. The whole reaction tank 4 is placed in a corundum tube 6 in a heating furnace 7, and the metal suspension wires are suspended below a high-temperature thermobalance 12, so that the weight of the materials 8 in the reaction process can be conveniently measured, and the reaction process can be monitored. After the reaction tank 4 is in place, starting to perform programmed heating on the heating furnace 7, wherein the specific heating process is as follows: (1) in the first heating stage, the temperature is heated from room temperature to 100 ℃ at the speed of 10 ℃/min, and nitrogen of 1.2L/min is introduced in the process so as to protect the materials from reacting; (2) in the second heating stage, the temperature is increased from 100 ℃ to 900 ℃ at a rate of 10 ℃/min, and 5L/min CO and 5L/minCO are introduced in the process2The gas flow rate is controlled by a flow meter 13; (3) in the third heating stage, the temperature is heated from 900 ℃ to 1100 ℃ at a speed of 4 ℃/min, and in the process, 7.5L/min of CO and 2.5L/minCO are introduced2The gas flow rate is controlled by a flow meter 13; (4) a fourth heating stage, heating from 1100 deg.C to 1200 deg.C at 4 deg.C/min, and introducing 9L/min CO and 1L/minCO2The gas flow rate is controlled by a flow meter 13; (5) after the temperature reaches 1200 ℃, the reaction is continued for 13min at the temperature, and the introduction of CO and CO is stopped2The mixed gas of (1). Cutting off the power supply, introducing 2.5L/min of nitrogen instead to facilitate cooling of the material 8, and simultaneously removing the reaction tank 4 from the heating furnace 7 and placing the reaction tank 4 in the air to keep the reaction tank 4 in a closed state. To be cooled by the material 8Stopping introducing nitrogen gas after the temperature is normal, pouring out the material 8, testing the weight of the material 8 and the carbon content in the material 8, and m1＝192.8g，c167.72%, calculating the reactivity of the carbon-iron composite furnace charge according to the formula (1), and calculating the result: CRIC＝59.8％。
Example 3:
and (3) carrying out ventilation drying on the carbon-iron composite furnace charge with the original content of iron ore powder of 20% and the particle size of 15mm until the moisture content of the material is less than 1%. Sample 350g (m)0) Material 8 and measuring the carbon content of material 8 before reaction, c071%, the material 8 is put into a reaction tank 4 with a certain number of corundum balls 5 paved at the bottom, the reaction tank 4 is shaken after the material 8 is put into the reaction tank to ensure that the surface of the material 8 is as flat as possible, and then a cover at the top of the reaction tank 4 is installed. A temperature thermocouple 9 is inserted into the top of the reaction tank 4, the depth of the temperature thermocouple 9 inserted into the material 8 is about 120mm, and the temperature thermocouple 9 is connected to a computer 11 through a temperature controller 10. The whole reaction tank 4 is placed in a corundum tube 6 in a heating furnace 7, and the metal suspension wires are suspended below a high-temperature thermobalance 12, so that the weight of the materials 8 in the reaction process can be conveniently measured, and the reaction process can be monitored. After the reaction tank 4 is in place, starting to perform programmed heating on the heating furnace 7, wherein the specific heating process is as follows: (1) in the first heating stage, the temperature is heated from room temperature to 100 ℃ at the speed of 10 ℃/min, and nitrogen of 1.5L/min is introduced in the process so as to protect the materials from reacting; (2) in the second heating stage, the temperature is increased from 100 ℃ to 900 ℃ at a rate of 10 ℃/min, and 5L/min CO and 5L/minCO are introduced in the process2The gas flow of the mixed gas is controlled by a flowmeter 13, and (3) in the third heating stage, the temperature is heated from 900 ℃ to 1100 ℃ at the speed of 4 ℃/min, and 7.5L/min CO and 2.5L/minCO are introduced in the process2The gas flow rate is controlled by a flow meter 13; (4) a fourth heating stage, heating from 1100 deg.C to 1200 deg.C at 4 deg.C/min, and introducing 9L/min CO and 1L/minCO2The gas flow rate is controlled by a flow meter 13; (5) after the temperature reaches 1200 ℃, the reaction is continued for 12min at the temperature, and the introduction of CO and CO is stopped2The mixed gas of (1). Cutting off power supply, introducing 3L/min nitrogen gas to cool the material 8, and coolingThe reaction tank 4 is removed from the heating furnace 7 and placed in the air, and the reaction tank 4 is kept in a closed state. After the material 8 is cooled to normal temperature, stopping introducing nitrogen gas, pouring out the material 8, testing the weight of the material 8 and the carbon content in the material 8, wherein m is1＝186g，c159.15%, calculating the reactivity of the carbon-iron composite furnace charge according to the formula (1), and calculating the result: CRIC＝61.8％。
Example 4:
and (3) carrying out ventilation drying on the carbon-iron composite furnace charge with the original content of iron ore powder of 35% and the particle size of 15mm until the moisture content of the material is less than 1%. Sample 300g (m)0) Material 8 and measuring the carbon content of material 8 before reaction, c0Putting the material 8 into a reaction tank 4 with a certain amount of corundum balls 5 paved at the bottom, shaking the reaction tank 4 after the material 8 is put in to ensure that the surface of the material 8 is as flat as possible, and then installing a cover at the top of the reaction tank 4. A temperature thermocouple 9 is inserted into the top of the reaction tank 4, the depth of the temperature thermocouple 9 inserted into the material 8 is about 100mm, and the temperature thermocouple 9 is connected to a computer 11 through a temperature controller 10. The whole reaction tank 4 is placed in a corundum tube 6 in a heating furnace 7, and the metal suspension wires are suspended below a high-temperature thermobalance 12, so that the weight of the materials 8 in the reaction process can be conveniently measured, and the reaction process can be monitored. After the reaction tank 4 is in place, starting to perform programmed heating on the heating furnace 7, wherein the specific heating process is as follows: (1) in the first heating stage, the temperature is heated from room temperature to 100 ℃ at the speed of 10 ℃/min, and nitrogen of 1.5L/min is introduced in the process so as to protect the materials from reacting; (2) in the second heating stage, the temperature is increased from 100 ℃ to 900 ℃ at a rate of 10 ℃/min, and 5L/min CO and 5L/minCO are introduced in the process2The gas flow of the mixed gas is controlled by a flowmeter 13, and (3) in the third heating stage, the temperature is heated from 900 ℃ to 1100 ℃ at the speed of 4 ℃/min, and 7.5L/min CO and 2.5L/minCO are introduced in the process2The gas flow rate is controlled by a flow meter 13; (4) a fourth heating stage, heating from 1100 deg.C to 1200 deg.C at 4 deg.C/min, and introducing 9L/min CO and 1L/minCO2The gas flow rate is controlled by a flow meter 13; (5) after the temperature reaches 1200 ℃, the reaction is continued for 10min at the temperature, and the introduction of CO and CO is stopped2The mixed gas of (1). Cutting off the power supply, introducing 3L/min of nitrogen instead to facilitate cooling of the materials 8, and simultaneously removing the reaction tank 4 from the heating furnace 7, placing the reaction tank 4 in the air, and keeping the reaction tank 4 in a closed state. After the material 8 is cooled to normal temperature, stopping introducing nitrogen gas, pouring out the material 8, testing the weight of the material 8 and the carbon content in the material 8, wherein m is1＝98g，c161.42%, calculating the reactivity of the carbon-iron composite furnace charge according to the formula (1), and calculating the result: CRIC＝73.6％。
The present invention is not limited to the above embodiments, and any modifications, equivalent replacements, improvements, etc. within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (9)
1. A method for evaluating the reaction performance of a carbon-iron composite furnace charge comprises the steps that the carbon-iron composite furnace charge is heated by a high-temperature reaction device, and the high-temperature reaction device comprises a heating furnace (7) internally provided with a corundum tube (6), a high-temperature thermobalance (12) used for suspending a reaction tank (4) and measuring the weight of the reaction tank (4), a gas cylinder connected with the reaction tank (4), a corundum ball (5) and a temperature thermocouple (9);
the method is characterized in that: the reaction performance evaluation method comprises the following steps:
step 1: carrying out ventilation drying on the carbon-iron composite furnace burden;
step 2: weighing the carbon-iron composite furnace burden to sample the material (8), testing the carbon content in the material (8) before reaction, and filling the material into a reaction tank (4);
and step 3: inserting a temperature thermocouple (9) into the reaction tank (4), inserting the temperature thermocouple (9) into the material (8), and suspending the reaction tank (4) in a corundum tube (6) in a heating furnace (7) through a high-temperature thermobalance (12);
and 4, step 4: the heating furnace (7) carries out sectional heating on the materials (8) in the reaction tank (4), and gas is introduced in the heating process;
and 5: cutting off the power supply after the reaction is finished, ventilating the reaction tank (4), and simultaneously removing the reaction tank (4) from the heating furnace (7) to cool the reaction tank (4) in the air;
step 6: after the material (8) is cooled to the normal temperature, stopping ventilation, pouring out the material (8), testing the weight and the carbon content of the material (8), and calculating the reactive CRI of the carbon-iron composite furnace materialCThe calculation formula is as follows:
wherein m is0M is the weight of the pre-reaction material (8)1Is the weight of the reacted material (8), c0Is the carbon content in the pre-reaction material (8), c1Is the carbon content in the reacted material (8).
2. The method for evaluating the reaction performance of the carbon-iron composite furnace charge according to claim 1, which is characterized by comprising the following steps: the content of iron ore powder in the carbon-iron composite furnace charge is 0.5-35%.
3. The method for evaluating the reactivity of the carbon-iron composite charge material according to claim 1 or 2, wherein: the granularity of the carbon-iron composite furnace charge is 15-25 mm; the moisture content of the carbon-iron composite furnace charge after ventilation drying is less than 1 percent.
4. The method for evaluating the reaction performance of the carbon-iron composite furnace charge according to claim 1, which is characterized by comprising the following steps: a plurality of corundum balls (5) are laid at the bottom of the reaction tank (4), and materials (8) are uniformly distributed above the corundum balls (5).
5. The method for evaluating the reaction performance of the carbon-iron composite furnace charge according to claim 1, which is characterized by comprising the following steps: the measuring end of the temperature thermocouple (9) is positioned at the center of the material (8), and the temperature thermocouple (9) is externally connected to the computer (11) through the temperature controller (10).
6. The method for evaluating the reaction performance of the carbon-iron composite furnace charge according to claim 1, which is characterized by comprising the following steps: the step 4 further comprises:
step 4.1: a first heating stage: heating the reaction tank (4) from room temperature to a first temperature threshold value, and introducing nitrogen into the reaction tank (4) while heating;
step 4.2: a second heating stage: heating the reaction tank (4) from a first heating threshold value to a second heating threshold value, and introducing CO and CO into the reaction tank (4) while heating2The mixed gas of (3);
step 4.3: a third heating stage: heating the reaction tank (4) from the second temperature threshold value to a third temperature threshold value, and introducing CO and CO into the reaction tank (4) while heating2The mixed gas of (3);
step 4.4: a fourth heating stage: heating the reaction tank (4) from the third temperature threshold value to the fourth temperature threshold value, and introducing CO and CO into the reaction tank (4) while heating2The mixed gas of (3);
step 4.5: continuing to react for 10-15min at the fourth temperature threshold, and stopping introducing CO and CO2The mixed gas of (1).
7. The method for evaluating the reaction performance of the carbon-iron composite furnace charge as claimed in claim 6, wherein the method comprises the following steps: in the first heating stage, the introduction speed of nitrogen is 1-1.5L/min, the first temperature threshold is 100 ℃, and the heating speed in the first heating stage is 10 ℃/min;
in said second heating stage, CO and CO2The feeding speed of the first heating stage is 5L/min, the second temperature threshold is 900 ℃, and the heating speed of the second heating stage is 10 ℃/min;
in the third heating stage, the introduction speed of CO is 7.5L/min, and CO is introduced into the reactor2The introduction speed of (2.5) is 2.5L/min, the third temperature threshold is 1100 ℃, and the heating speed of the third heating stage is 4 ℃/min;
in the fourth heating stage, the introduction speed of CO is 9L/min, and CO is introduced into the furnace2The introduction speed of (2) is 1L/min, the fourth temperature threshold is 1200 ℃, and the heating speed of the fourth heating stage is 4 ℃/min.
8. The method for evaluating the reaction performance of the carbon-iron composite furnace charge according to claim 1, which is characterized by comprising the following steps: in the step 4, gas is introduced into the bottom of the reaction tank (4) through a flow meter (13), and is dispersed by a plurality of corundum balls (5) and then contacts with the material (8).
9. The method for evaluating the reaction performance of the carbon-iron composite furnace charge according to claim 1, which is characterized by comprising the following steps: in the step 5, the gas introduced into the reaction tank (4) is nitrogen, and the nitrogen is introduced into the bottom of the reaction tank (4) through a flow meter (13) and is dispersed by a plurality of corundum balls (5) and then contacts with the material (8).
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| 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 |
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