An experimental device and method for deteriorating coke with an alkali metal

Abstract

The present invention relates to an experimental device and method for alkali metal to deteriorate coke, which includes a lifting mechanism, a gas circulation system, and a heating device; the heating device includes a housing, a heating chamber, a heating thermocouple, and a heating chamber protective cover. A heating chamber protective cover is arranged inside the housing, and the heating thermocouple is arranged between the heating chamber and the heating protective cover. The heating thermocouple is divided into upper, middle, and lower sections; the lifting system includes a motor, a worm gear screw jack, and a material loading tray. The material loading tray is connected to the worm gear screw jack, and the motor drives the worm gear screw jack to move up and down; in the gas circulation system, a circulation fan drives the gas or steam in the heating chamber to circulate along the circulation pipeline and the heating chamber; when the gas in the heating chamber reaches the set pressure value, the solenoid valve automatically closes, and when the gas in the heating chamber does not reach the set pressure value, the solenoid valve automatically opens to supplement the gas. The advantages are: it can completely simulate the phenomenon of alkali metal in coke in the blast furnace being first adsorbed and then volatilized.

Description

Technical Field

[0001] The present invention relates to an experimental device and method for alkali metal to deteriorate coke. Background Art

[0002] Blast furnace ironmaking is the most important production link in the iron and steel metallurgy process. Coke, as a blast furnace raw fuel, plays a supporting role in the blast furnace burden column. Alkali metals in the blast furnace usually refer to K, Na metals and their compounds. When alkali metals enter the blast furnace with the burden, as the burden moves down, the temperature inside the blast furnace gradually increases. The alkali metals volatilize from the burden and move upward with the blast furnace gas. When moving to the upper part of the blast furnace, the temperature decreases, and the alkali metal vapor is adsorbed in the pore structure of the blast furnace burden, especially coke. As a result, alkali metals are cyclically enriched inside the blast furnace. Since alkali metals have a catalytic effect on the gasification deterioration of coke, the strength of coke is reduced, and then the coke breaks, generating more small pieces of coke or coke powder. A large amount of powder accumulates in the dead burden column, which is likely to reduce the blast furnace permeability, is not conducive to the reasonable distribution of the coal gas flow inside the blast furnace, reduces the reduction performance of iron-containing minerals, and thus is not conducive to the stable and smooth operation of the blast furnace.

[0003] Therefore, reducing the alkali metal content in iron-containing raw materials is crucial for the blast furnace permeability. However, in daily production, iron-containing burden materials including sinter, pellet, and coke all contain alkali metals, but there is no clear quantitative index for the degree of coke deterioration by alkali metals, the deterioration law of alkali metals on coke is not clear, and the catalytic deterioration behavior of coke, which plays the role of the burden column skeleton, has not yet been included in the evaluation system of raw coke. Therefore, developing an evaluation method for the catalytic deterioration behavior of coke by alkali metals under the actual reaction conditions inside the blast furnace is of great significance for understanding the reaction behavior of coke inside the blast furnace, improving the blast furnace permeability, and achieving the stable and smooth operation of the blast furnace.

[0004] In the prior art, Chinese Patent CN201010602474.5 discloses a method for simulating and testing the influence of alkali metals on the deterioration of coke; Chinese Patent CN201410503669.2 discloses a method for testing the destructive effect and performance influence of alkali metals and zinc vapor on coke; Chinese Patent CN201810461721.0 discloses a device and method for studying the influence of alkali metals on the reactivity of coke under the conditions of water vapor and carbon dioxide; Chinese Patent CN201911072373.9 discloses a verification method for potassium, sodium, calcium, and magnesium adsorbed on the surface of coke to accelerate the coke dissolution reaction during blast furnace ironmaking; Chinese Patent CN201810445923.6 discloses an experimental method for simulating the deterioration process of coke in the softening and melting zone of a blast furnace. The above patents all convert alkali metal carbonates containing K and Na into steam through high temperature, or directly soak the coke in an alkali solution containing K and Na and then heat it at high temperature, so as to simulate the catalytic deterioration of alkali metals on coke. However, it fails to simulate the actual cyclic enrichment phenomenon of alkali metal vapor inside the blast furnace, and even less can simulate the influence of the cyclicly enriched alkali metals on the quality of coke. In addition, the heating containers or devices disclosed therein are mainly temperature-controlled in one section, which does not conform to the actual reaction conditions where the temperature gradually increases from top to bottom inside the blast furnace, and even less can simulate the phenomenon that coke adsorbs alkali metals at low temperature and turns into alkali vapor and volatilizes at high temperature. Summary of the Invention

[0005] To overcome the deficiencies of the prior art, the purpose of the present invention is to provide an experimental device and method for the deterioration of coke by alkali metals, which can simulate the influence of cyclic alkali metal vapor inside the blast furnace on the quality of coke, and thus provide a new reference basis for the selection of blast furnace coke raw materials.

[0006] To achieve the above purpose, the present invention is realized through the following technical solutions:

[0007] An experimental device for the deterioration of coke by alkali metals includes a lifting mechanism, a gas circulation system, and a heating device;

[0008] The heating device includes a housing, a heating chamber, heating thermocouples, and a heating chamber protective cover. The housing is provided with a heating chamber protective cover inside, and the heating thermocouples are arranged between the heating chamber and the heating protective cover. The heating thermocouples are symmetrically distributed in a ring shape and are divided into upper, middle, and lower sections, corresponding to the upper, middle, and lower sections of the heating chamber respectively. The three sections of heating thermocouples are respectively controlled by a computer heating control system to control the heating temperature;

[0009] The lifting system includes a motor, a worm and screw lift, and a material loading tray. The material loading tray is arranged inside the heating chamber and is connected to the worm and screw lift. The motor drives the worm and screw lift to move up and down, thereby driving the material loading tray to move up and down inside the heating chamber;

[0010] The gas circulation system includes a circulation fan, an inflation bottle, a pressure gauge, and a circulation air duct. The circulation fan is fixedly installed between the heating chamber protective cover and the outer shell. There is a circulation air outlet on the heating chamber protective cover. The circulation fan drives the gas or steam in the heating chamber to circulate along the circulation air duct and the heating chamber. A pressure gauge communicating with the heating chamber is installed at the top of the outer shell to measure the internal air pressure of the heating chamber. The inflation bottle is connected to the circulation air duct through a pipeline equipped with an electromagnetic valve. The circulating gas is filled from the inflation bottle. When the gas in the heating chamber reaches the set pressure value, the electromagnetic valve automatically closes. When the gas in the heating chamber does not reach the set pressure value, the electromagnetic valve automatically opens to supplement the gas, thereby controlling the internal pressure of the heating device to remain constant.

[0011] The material loading tray includes a porous high-temperature resistant tray, a porous high-temperature resistant pedestal, a material storage box, and a cylindrical arm. The porous high-temperature resistant pedestal is in a bowl-shaped structure, with a porous high-temperature resistant tray at the top. The porous high-temperature resistant tray is a circular plate-shaped structure with holes. A cylindrical arm is fixed on the porous high-temperature resistant tray. The porous high-temperature resistant tray matches the inner edge of the porous high-temperature resistant pedestal. A material storage box containing alkali metal is arranged inside the porous high-temperature resistant pedestal, and the upper part of the material storage box is an open structure. Corundum balls with uniform particle size are laid on the porous high-temperature resistant tray. Coke is placed above the corundum balls. The coke and corundum balls are filled inside the cylindrical arm. The circulating gas sequentially passes through the porous high-temperature resistant pedestal from bottom to top, carries the alkali metal vapor and then passes through the porous high-temperature resistant tray, and then passes through the corundum balls to contact and react with the coke.

[0012] The heating chamber protective cover is a three-layer structure, with the inner layer being a high-temperature resistant refractory material layer, the middle layer being a heat-insulating refractory cotton layer, and the outer layer being an iron sheet layer.

[0013] The outer surface of the worm gear screw lift is wrapped with heat-insulating refractory cotton at the part opposite to the heating chamber, and the material of the worm gear screw lift is a high-temperature resistant material.

[0014] An experimental method for deteriorating coke with alkali metal includes the following steps:

[0015] 1) Place the material storage box containing alkali metal on the porous high-temperature resistant pedestal of the material loading tray, cover the porous high-temperature resistant tray on the porous high-temperature resistant pedestal, then lay corundum balls above the porous high-temperature resistant tray, load coke above the corundum balls, and lift the material loading tray to the upper edge of the upper heating chamber. Set the heating constant temperature intervals of the upper, middle, and lower heating chambers and the descending speed of the material loading tray respectively.

[0016] 2) The heating thermocouple heats the upper heating chamber to the upper heating constant temperature range. The material loading tray moves downward driven by the motor along with the worm and screw elevator. When it moves to the middle heating chamber, the middle heating chamber reaches the set temperature range, and so on until the material loading tray descends to the bottom of the lower heating chamber. During the descent of the material loading tray, the circulation fan and the solenoid valve of the gas cylinder pipeline are turned on to supplement the circulating gas. Driven by the circulation fan, the circulating gas carries the alkali metal vapor through the coke in the material loading tray.

[0017] 3) After cooling, take out the coke and measure the reactivity and drum strength of the coke.

[0018] In steps 1)-2), the temperatures of the upper heating chamber, the middle heating chamber, and the lower heating chamber in the heating chamber gradually increase from top to bottom, thereby simulating the gradually increasing temperature from top to bottom in the blast furnace.

[0019] In steps 1)-2), the temperatures of the upper heating chamber, the middle heating chamber, and the lower heating chamber in the heating chamber are kept at the same temperature, and the catalytic degradation reaction of alkali metals on coke at different temperatures is compared through three separate experiments with gradually increasing temperatures.

[0020] The alkali metal storage box stores a solution containing alkali metal K or Na, or stores a salt containing alkali metal K or Na that can volatilize under high-temperature conditions.

[0021] The circulating gas supplemented by the gas filling bottle is one or a mixture of CO2, N2, H2O, and CO.

[0022] The flow rate of the circulating gas is 0.5 - 20 L / min, and the pressure of the heating chamber is controlled at 100 - 500 kPa.

[0023] Compared with the prior art, the beneficial effects of the present invention are:

[0024] The present invention uses multi-stage temperature control to fully simulate the phenomenon of alkali metal in coke in the blast furnace being first adsorbed and then volatilized. In addition, the experimental device can simulate the gradual increase in heating temperature during the downward movement of the coke material, and at the same time, the reaction between the descending coke and the reverse airflow carrying the alkali metal vapor. The two move in opposite directions at the same time, thereby realizing the deterioration behavior and strength change of the coke after reacting with the circulating alkali metal under the conditions of variable temperature and controllable pressure inside the blast furnace. Using this experimental device can also simulate the influence of alkali metals on coke deterioration under different pressure conditions, which is more in line with the actual blast furnace reaction conditions. Description of the Drawings

[0025] Figure 1 It is a structural schematic diagram of an experimental device for alkali metal to deteriorate coke.

[0026] Figure 2 It is a structural schematic diagram of the material loading tray.

[0027] Figure 3 It is a schematic structural diagram of a porous high-temperature resistant support plate.

[0028] In the figure: 1 - heating chamber, 2 - heating thermocouple, 3 - heating chamber protective cover, 4 - motor, 5 - worm gear screw jack, 6 - material loading tray, 7 - circulation fan, 8 - circulation air duct, 9 - gas cylinder, 10 - solenoid valve, 11 - storage box, 12 - gas pressure gauge, 13 - porous high-temperature resistant support, 14 - porous high-temperature resistant support plate, 15 - cylindrical arm, 16 - corundum ball, 17 - coke. Specific embodiments

[0029] The present invention will be described in detail below in conjunction with the accompanying drawings of the specification, but it should be noted that the implementation of the present invention is not limited to the following embodiments.

[0030] See Figures 1-3 , an experimental device for deteriorating coke with alkali metal, comprising a heating device, a lifting mechanism, and a gas circulation system;

[0031] The heating device includes a housing, a heating chamber 1, a heating thermocouple 2, and a heating chamber protective cover 3. The heating chamber protective cover 3 is provided inside the housing. The heating thermocouple 2 is inside the heating chamber protective cover 3. The heating thermocouple 2 is arranged between the heating chamber 1 and the heating protective cover, and is symmetrically distributed in a ring shape. The heating thermocouple 2 is divided into upper, middle, and lower sections, corresponding to the upper, middle, and lower sections of the heating chamber 1 respectively. The three sections of heating thermocouples 2 are respectively controlled by a computer heating control system for heating;

[0032] The lifting system includes a motor 4, a worm gear screw jack 5, and a material loading tray 6. The material loading tray 6 is arranged inside the heating chamber 1. The material loading tray 6 is connected to the worm gear screw jack 5. The motor 4 drives the worm gear screw jack 5 to move up and down, thereby driving the material loading tray 6 to move up and down inside the heating chamber 1;

[0033] The gas circulation system includes a circulation fan 7, a gas cylinder 9, a pressure gauge 12, and a circulation air duct 8. The circulation fan 7 is fixedly installed between the heating chamber protective cover 3 and the housing. The heating chamber protective cover 3 is provided with a circulation air outlet. The circulation fan 7 drives the gas or steam inside the heating chamber 1 to circulate along the circulation air duct 8 and the heating chamber 1. A pressure gauge 12 communicating with the heating chamber 1 is installed at the top of the housing for measuring the internal air pressure of the heating chamber 1; the gas cylinder 9 is connected to the circulation air duct 8 through a pipeline equipped with a solenoid valve 10. The circulating gas is filled from the gas cylinder 9. When the gas inside the heating chamber 1 reaches the set pressure value, the solenoid valve 10 automatically closes. When the gas inside the heating chamber 1 does not reach the set pressure value, the solenoid valve 10 automatically opens to supplement the gas, thereby controlling the internal pressure of the heating device to remain constant.

[0034] The material loading tray 6 includes a porous high-temperature resistant tray 14, a porous high-temperature resistant socket 13, a material storage box 11, and a cylindrical arm 15. The porous high-temperature resistant socket 13 is in a bowl-shaped structure, with a porous high-temperature resistant tray 14 provided at the top. The porous high-temperature resistant tray 14 is a circular plate-shaped structure with holes. A cylindrical arm 15 is fixed on the porous high-temperature resistant tray 14. The porous high-temperature resistant tray 14 matches the inner edge of the porous high-temperature resistant socket 13. A material storage box 11 containing alkali metal is provided inside the porous high-temperature resistant socket 13, and the upper part of the material storage box 11 is an open structure. Corundum balls 16 with uniform particle size are laid on the porous high-temperature resistant tray 14, and coke 17 is placed above the corundum balls 16. The coke 17 and corundum balls 16 are filled inside the cylindrical arm 15. The circulating gas passes through the porous high-temperature resistant socket 13 from bottom to top in sequence, carries the alkali metal vapor, then passes through the porous high-temperature resistant tray 14, and then passes through the corundum balls 16, and contacts and reacts with the coke 17.

[0035] The heating chamber protective cover 3 is a three-layer structure, with the inner layer being a high-temperature resistant refractory material layer, the middle layer being a heat-insulating refractory cotton layer, and the outer layer being an iron sheet layer. The outer surface of the part of the worm gear screw lift 5 in the heating chamber 1 is wrapped with heat-insulating refractory cotton, and the material of the worm gear screw lift 5 is a material resistant to 1600 °C high temperature.

[0036] Example 1

[0037] An experimental method for deteriorating coke with alkali metal includes the following steps:

[0038] 1) Place the material storage box 11 filled with Na2CO3 powder on the material loading tray 6. The material loading tray 6 is placed on the lower porous high-temperature resistant socket 13, and the upper porous high-temperature resistant tray 14 is matched and covered on the lower porous high-temperature resistant socket 13. Corundum balls 16 are laid above the high-temperature resistant tray 14, and coke 17 is loaded above the corundum balls 16. Then, use the motor 4 to drive the worm gear screw lift 5 to lift the material loading tray 6 to the upper edge of the upper heating chamber 1.

[0039] 2) Set the three-stage heating temperature range of the heating chamber 1 control system. The set temperature of the first-stage heating chamber 1 is 1000 °C, and the heating time is 1 h. The material loading tray 6 moves downward at a speed of 0.04 m / h with the worm gear screw lift 5 driven by the motor 4 to the second-stage heating chamber. The second-stage heating chamber 1 just reaches the set temperature of 1300 °C, and the material loading tray 6 continues to gradually descend at a speed of 0.04 m / h to the bottom of the third-stage heating chamber in the second-stage heating chamber. At this time, the heating temperature of the third-stage heating chamber reaches 1600 °C, and it descends to the bottom of the third-stage heating chamber at a speed of 0.04 m / h. During the gradual descent of the material loading tray 6, turn on the circulating fan 7 and supplement N2 at the same time. When the pressure gauge 12 is stably controlled at 200 kPa, the solenoid valve 10 of the gas filling bottle 9 automatically closes. The circulating N2 carries the alkali metal vapor through the coke 17 in the material loading tray 6 through the circulating air duct 8, and under the drive of the circulating fan 7, it circulates uniformly inside the experimental device at a flow rate of 1 L / min.

[0040] 3) After the experimental device cools down, take out the coke 17 and measure the reactivity and drum strength of the coke 17.

[0041] Example 2

[0042] An experimental method for alkali metal to deteriorate coke includes the following steps:

[0043] 1) Place the storage box 11 filled with K2CO3 solution on the material loading tray 6. The material loading tray 6 is placed on the lower porous high-temperature support 13. Match and cover the upper porous high-temperature plate 14 on the lower porous high-temperature support 13. Arrange corundum balls 16 above the high-temperature plate 14. Load the coke 17 above the corundum balls 16, and use the motor 4 to drive the worm screw lift 5 to lift the material loading tray 6 to the upper heating chamber;

[0044] 2) First test: Set the three-stage heating chambers of the heating control system to a constant temperature of 1000 °C. The material loading tray 6 descends with the worm screw lift 5 to the bottom of the lower heating chamber at a rate of 0.02 m / h. During the gradual descent of the material loading tray 6, turn on the circulation fan 7 and replenish CO2 at the same time. When the pressure gauge 12 is stably controlled at 500 kPa, the solenoid valve 10 of the gas filling bottle 9 automatically closes. The circulating CO2 carries alkali metal vapor through the coke 17 in the material loading tray 6 through the circulation air duct 8 and circulates uniformly inside the experimental device at a flow rate of 5 L / min under the drive of the circulation fan 7.

[0045] 3) After the experimental device cools down, take out the coke 17 and measure the reactivity and drum strength of the coke 17.

[0046] 4) Second test: Set the three-stage heating chambers 1 of the heating control system to a constant temperature of 1300 °C, and repeat the operations in steps 2-3).

[0047] 5) Third test: Set the three-stage heating chambers 1 of the heating control system to a constant temperature of 1600 °C, and repeat the operations in steps 2-3).

[0048] 6) Compare and analyze the effects of alkali metals on the reactivity and drum strength of the coke 17 at different temperatures in steps 3-5).

[0049] Example 3

[0050] An experimental method for alkali metal to deteriorate coke includes the following steps:

[0051] 1) Place the storage box 11 filled with Na2CO3 solution on the material holding tray 6. Place the material holding tray 6 on the lower porous high-temperature support 13. Match and cover the upper porous high-temperature support plate 14 on the lower porous high-temperature support 13. Arrange corundum balls 16 above the high-temperature support plate 14. Load coke 17 above the corundum balls 16, and use the motor 4 to drive the worm screw lift 5 to lift the material holding tray 6 to the upper heating chamber.

[0052] 2) First test: Set the three heating chambers of the heating control system to a constant temperature of 1350 °C. The material holding tray 6 descends with the worm screw lift 5 to the bottom of the lower heating chamber, descending at a rate of 0.03 m / h. During the gradual descent of the material holding tray 6, turn on the circulation fan 7 and simultaneously supplement a mixed gas of CO and CO2. When the pressure gauge 12 is stably controlled at 101 kPa, the solenoid valve 10 of the gas filling bottle 9 automatically closes. The circulating CO and CO2 carry alkali metal vapor through the coke 17 in the material holding tray 6 through the circulation air duct 8 and circulate uniformly at a flow rate of 20 L / min inside the experimental device under the drive of the circulation fan 7.

[0053] 3) After the experimental device cools down, take out the coke 17 and measure the reactivity and drum strength of the coke 17.

[0054] 4) Second test, set the pressure gauge 12 to be stably controlled at 200 kPa, and repeat the operations in steps 2 - 3).

[0055] 5) Third test, set the pressure gauge 12 to be stably controlled at 300 kPa, and repeat the operations in steps 2 - 3).

[0056] 6) Compare and analyze the effects of alkali metals on the reactivity and drum strength of coke 17 under different pressures in steps 3 - 5).

[0057] The present invention can simulate the influence of circulating alkali metal vapor on the quality of coke under the conditions of temperature change inside the blast furnace, compare and analyze the influence of different types of alkali metals on the quality strength of coke, as well as the catalytic performance of alkali metals on the gasification deterioration behavior of coke under different temperature and pressure conditions. Predict the coke deterioration law in the blast furnace through the change situation of alkali metal-catalyzed deteriorated coke, and further provide a new reference basis for the selection of blast furnace coke raw materials.

Claims

1. An experimental device for alkali metal to deteriorate coke, characterized in that, It includes a lifting mechanism, a gas circulation system and a heating device; The heating device includes a housing, a heating chamber, heating thermocouples, a heating chamber protective cover and the heating chamber protective cover is arranged inside the housing. The heating thermocouples are arranged between the heating chamber and the heating protective cover and are symmetrically distributed in a ring shape. The heating thermocouples are divided into upper, middle and lower sections, corresponding to the upper, middle and lower sections of the heating chamber respectively. The three sections of heating thermocouples control the heating temperature through a computer heating control system respectively; The lifting mechanism includes a motor, a worm gear screw jack and a material loading tray. The material loading tray is arranged inside the heating chamber, is connected with the worm gear screw jack, and the motor drives the worm gear screw jack to move up and down, thereby driving the material loading tray to move up and down inside the heating chamber; The gas circulation system includes a circulation fan, an inflation bottle, a pressure gauge and a circulation air duct. The circulation fan is fixedly installed between the heating chamber protective cover and the housing. There is a circulation air outlet on the heating chamber protective cover. The circulation fan drives the gas or steam inside the heating chamber to circulate along the circulation air duct and the heating chamber. A pressure gauge communicated with the heating chamber is installed at the top of the housing for measuring the internal air pressure of the heating chamber; The inflation bottle is communicated with the circulation air duct through a pipeline equipped with a solenoid valve. The circulating gas is filled from the inflation bottle. When the gas inside the heating chamber reaches the set pressure value, the solenoid valve automatically closes. When the gas inside the heating chamber does not reach the set pressure value, the solenoid valve automatically opens to supplement the gas, thereby controlling the internal pressure of the heating device to remain constant; The material loading tray includes a porous high-temperature resistant tray, a porous high-temperature resistant seat, a material storage box and a cylindrical arm. The porous high-temperature resistant seat is in a bowl shape and is provided with a porous high-temperature resistant tray at the top. The porous high-temperature resistant tray is a circular plate-shaped structure with holes. A cylindrical arm is fixed on the porous high-temperature resistant tray. The porous high-temperature resistant tray matches the inner edge of the porous high-temperature resistant seat; A material storage box containing alkali metal is arranged inside the porous high-temperature resistant seat, and the upper part of the material storage box is an open structure; Corundum balls with uniform particle size are laid on the porous high-temperature resistant tray. Coke is placed above the corundum balls. The coke and corundum balls are filled inside the cylindrical arm. The circulating gas sequentially passes through the porous high-temperature resistant seat from bottom to top, carries alkali metal vapor and then passes through the porous high-temperature resistant tray, and then passes through the corundum balls to contact and react with the coke; The temperatures of the upper section heating chamber, the middle section heating chamber and the lower heating chamber in the heating chamber gradually increase from top to bottom in sequence, thereby simulating the gradually increasing temperature of the blast furnace from top to bottom; Or, the temperatures of the upper section heating chamber, the middle section heating chamber and the lower heating chamber in the heating chamber are kept at the same temperature, and the catalytic degradation reaction of alkali metal on coke at different temperatures is compared through 3 separate experiments with gradually increasing temperatures; The alkali metal storage box stores a solution containing alkali metal K or Na.

2. The experimental device for alkali metal deteriorating coke according to claim 1, characterized in that, The heating chamber protective cover is of a three-layer structure, with the inner layer being a high-temperature resistant refractory material layer, the middle layer being a heat-insulating refractory cotton layer, and the outer layer being an iron sheet layer.

3. The experimental device for alkali metal deteriorating coke according to claim 1, characterized in that, The outer surface of the worm gear screw jack at the part opposite to the heating chamber is wrapped with heat-insulating refractory cotton, and the material of the worm gear screw jack is a high-temperature resistant material.

4. An experimental method for alkali metal to deteriorate coke implemented by using the device according to any one of claims 1-3, characterized in that, It includes the following steps: 1) Place the storage box containing the alkali metal on the porous high-temperature resistant support of the material storage tray, cover the porous high-temperature resistant tray on the porous high-temperature resistant support, then lay corundum balls above the porous high-temperature resistant tray, load coke above the corundum balls, and raise the material storage tray to the upper edge of the upper heating chamber. Set the heating and constant temperature intervals of the upper, middle, and lower heating chambers and the descending speed of the material storage tray respectively; 2) The heating thermocouple heats the upper heating chamber to the upper heating constant temperature interval. The material storage tray moves downward driven by the motor with the worm and screw lifter. When it moves to the middle heating chamber, the middle heating chamber reaches the set temperature interval, and so on until the material storage tray descends to the bottom of the lower heating chamber. During the descent of the material storage tray, turn on the circulation fan and the solenoid valve of the gas cylinder pipeline to supplement the circulating gas. The circulating gas carries the alkali metal vapor through the coke in the material storage tray driven by the circulation fan; 3) After cooling, take out the coke and measure the reactivity and drum strength of the coke.

5. The experimental method for alkali metal deteriorated coke according to claim 4, characterized in that The circulating gas supplemented by the gas cylinder is one or several mixtures of CO2, N2, H2O, and CO.

6. The experimental method for alkali metal deteriorated coke according to claim 4, characterized in that, The flow rate of the circulating gas is 0.5 - 20 L / min, and the pressure of the heating chamber is controlled at 100 - 500 kPa.

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