Method for rapidly repairing erosion of HYCROF blast furnace

Abstract

The invention belongs to the technical field of HYCROF blast furnace repair, and particularly discloses a method for quickly repairing erosion of an HYCROF blast furnace, which comprises the following steps: presetting a grouting protection strategy, predicting a target area, calculating the amount of grouting required to be filled when cracks are generated, carrying out grouting maintenance, presetting an oxygen concentration adjusting strategy, and reducing the oxygen concentration of the target area. The method comprises the following steps: presetting a furnace waist protection strategy, blowing a bonding mixture at a tuyere, carrying out local reinforced furnace protection, optimizing an iron notch area, carrying out pre-drilling on the iron notch area during tapping, and carrying out mud-making plugging on the iron notch area after tapping, so that the tapping effect is improved, the material distribution mode is optimized, and the service life of the furnace is prolonged. And according to different melting points and different falling points of different materials, the blanking sequence and the blanking position are adjusted, and the liquid permeability of the hearth is improved.

Description

Technical Field

[0001] The invention relates to the technical field of HYCROF furnace hearth rapid repair, and in particular to a method for rapid repairing corrosion of a HYCROF blast furnace. Background Art

[0002] Carbon cycle refers to the process of recycling two carbon derivatives, CO and H2, for reduction reactions in the blast furnace. In the hydrogen-rich carbon cycle blast furnace, the high-temperature heat energy generated by hydrogen-rich combustion is used to reduce iron ore to iron, and a carbon decomposition reaction is carried out to separate the two carbon derivatives, CO and H2, and then recycle them for reduction reactions in the blast furnace, thus realizing the recycling of carbon and reducing carbon emissions. The hydrogen-rich carbon cycle blast furnace is a new type of steel production technology with high efficiency, low carbon and low energy consumption.

[0003] The hearth of a hydrogen-rich carbon cycle blast furnace (HYCROF) is an important equipment for iron smelting, and the erosion of the hearth of a blast furnace is a difficult problem in the operation of HYCROF. The erosion of the hearth will lead to a reduction in the thickness of the hearth wall, and even serious problems such as hearth rupture, posing a threat to the normal operation and production safety of the blast furnace. The main causes of hearth erosion are erosion by high-temperature gas, scouring by metal slag slurry, and metal corrosion. The oxygen and water vapor in the high-temperature gas will chemically react with the inner wall material of the hearth, leading to corrosion and peeling of the hearth wall material. The metal slag slurry will cause mechanical scouring of the inner wall of the hearth during the flow process, accelerating the wear and erosion of the hearth. Metal corrosion is caused by the reaction of metal with the inner wall material of the hearth at high temperature to form metal oxides, leading to erosion of the hearth. The rupture of the blast furnace wall may not only cause personal injury, equipment damage, and production interruption, but may also affect the environment and product quality. Therefore, maintaining the integrity and stability of the blast furnace wall is crucial to ensuring production safety, environmental protection, and product quality. Summary of the invention

[0004] The purpose of the present invention is to provide a method for quickly repairing erosion of a HYCROF blast furnace, so as to solve the problem that the furnace hearth is subjected to long-term erosion and the furnace hearth wall breaks, resulting in leakage of high-temperature liquid in the furnace, causing personal injury, equipment damage and production interruption.

[0005] To achieve the above object, the basic scheme provided by the present invention is: a method for quickly repairing corrosion of a HYCROF blast furnace, comprising:

[0006] Preset grouting protection strategy, make predictions for target areas, calculate the amount of grouting required to fill cracks, and perform grouting maintenance;

[0007] Preset oxygen concentration adjustment strategy to reduce oxygen concentration in the target area and reduce oxygen wear and erosion on furnace refractory materials;

[0008] Preset furnace waist protection strategy, spray bonding mixture at the tuyere to strengthen the furnace protection locally;

[0009] Optimize the taphole area, pre-drill the taphole area during tapping, and seal the taphole area with mud after tapping to improve the tapping effect;

[0010] Optimize the material distribution method, adjust the material feeding sequence and position according to the different melting points and different landing points of different materials, and improve the liquid permeability of the furnace.

[0011] The working principle of the present invention is as follows: a grouting prediction protection strategy is used to calculate whether cracks appear on the furnace or the furnace wall becomes thinner. If cracks appear, the grouting amount is calculated, and then the cracks in the furnace are filled and repaired, so that the grouting material enters the gap to fill the cracks; an oxygen concentration adjustment strategy is used to adjust the oxygen concentration in the furnace and control the temperature in the furnace within a suitable range; a furnace waist protection strategy is used to spray a bonding mixture on the weak parts of the furnace waist to maintain the furnace wall thickness in the furnace waist and belly area; the iron mouth area is optimized so that the mud sheath can be completely cleaned when tapping iron, and the iron mouth is completely blocked after tapping iron; the material distribution method is optimized, and materials with high melting points and materials with low melting points are placed in batches.

[0012] The beneficial effects of the present invention are as follows: different maintenance methods are applied to different areas of the blast furnace, and different crack areas of the furnace hearth are filled by grouting treatment to prevent gas leakage from gaps due to thermal expansion and contraction, oxidation and loosening of the furnace hearth refractory materials due to water immersion, and erosion of gaps by gas flow, resulting in the cooling wall being unable to effectively conduct heat and aggravating the erosion of the carbon bricks in the furnace hearth; by adjusting the amount of oxygen in the tuyere and then the temperature in the furnace, the reactivity of local charge is reduced, and the wear of the charge on the side wall of the furnace hearth is reduced; by spraying a bonding mixture to maintain the furnace waist and thicken the furnace waist, the lining of the furnace waist and belly is effectively protected; by optimizing the iron mouth implementation method before and after iron tapping, the iron tapping speed is accelerated and the iron tapping efficiency is effectively improved; by optimizing the distribution method, the incoming material can be burned completely and evenly, the occurrence of material agglomeration is reduced, and the uniformity of material combustion is improved.

[0013] Option 2 is the preferred basic option. The steps of the grouting protection strategy are as follows:

[0014] S1: Use long-branch thermocouples and short-branch thermocouples to measure the furnace temperature in different areas;

[0015] S2: Using the PLC controller, the residual thickness of different areas in the furnace is measured according to the temperature and thermal conductivity of each furnace;

[0016] S3: When the temperature inside the furnace is measured to rise, the residual thickness will give the illusion of rising data. At this time, it is determined that a gap has occurred in the target area of ​​the furnace wall. The gas concentration in the target area is then detected, and the size of the gap is determined based on the gas concentration in the target area. According to the size of the gap, appropriate grouting treatment is performed on the cold and hot surfaces of the target area to improve the thermal conductivity.

[0017] The temperature values ​​of the long and short branch hot spot couples are detected through the PLC control system, and the residual thickness of the measured area is calculated. When the residual thickness value changes, the hot surface grouting operation is carried out on the target area to prevent the occurrence of gap gas leakage due to thermal expansion and contraction, oxidation and loosening of the furnace hearth refractory materials due to water immersion, and erosion of the furnace hearth refractory materials by the gas flow, the inability of the cooling wall to conduct heat effectively due to the gaps, and the aggravation of the erosion of the furnace hearth carbon bricks.

[0018] Option 3, which is the preferred option of the basic option, is an oxygen concentration adjustment strategy, specifically including:

[0019] The temperature inside the furnace is measured using a long-branch thermocouple;

[0020] If the furnace temperature is within the range of 300℃-400℃, the oxygen volume shall be reduced by 5m3 for every 20℃ increase in furnace temperature. 3 / h, and adjust the oxygen regulating valve opening to 3-5 degrees;

[0021] If the furnace temperature is within the range of 400℃-500℃, the oxygen volume shall be reduced by 10m3 for every 20℃ increase in furnace temperature. 3 / h, and adjust the oxygen regulating valve opening to 7 degrees;

[0022] If the temperature inside the furnace is greater than 500°C, close the oxygen regulating valve, stop supplying oxygen, and open the nitrogen valve to allow nitrogen to flow into the furnace.

[0023] By reducing the amount of oxygen to lower the temperature in the furnace, the erosion of the furnace wall by high temperature is effectively prevented.

[0024] Scheme 4 is the optimal choice of the basic scheme. The steps of the furnace waist protection strategy are as follows:

[0025] S1: Using the long-branch thermocouple and the short-branch thermocouple, the furnace temperature of the furnace waist is measured;

[0026] S2: Using the PLC controller, the residual thickness of the furnace waist is measured according to the temperature and thermal conductivity of each furnace;

[0027] q1=(1150-t1) / (s1 / λ1)

[0028] q2=(t1-t2) / (s2 / λ2)

[0029] Heat flux intensity: q = t / (s / λ), where t is the temperature of the measuring point (°C), λ1 and λ2 are the thermal conductivity of the carbon brick (w / m*k), s1 is the residual thickness, and s2 is the distance between the two thermocouples;

[0030] S3: Based on the remaining thickness, the interface temperature between the carbon brick and the bonding mixture is measured to find the required bonding mixture thickness:

[0031] (T 界 -t1)(s1 / λ1)=(t1-t2) / (s2 / λ2)

[0032] Where T 界 is the interface temperature between carbon brick and bonding mixture (°C);

[0033] S4: According to the interface temperature, the required thickness of the bonding mixture is measured:

[0034] (1150-T 界 )(s 粘 / λ 粘 )=(t1-t2) / (s2 / λ2)

[0035] Where 1150 is the temperature of the isothermal solidified iron wire (℃), s 粘 is the thickness of the bonding mixture (mm), λ 粘 is the thermal conductivity of the bonding mixture (w / m*k), s2 is the distance between the two thermocouples, λ2 is the thermal conductivity of the carbon brick: 12w / m*k, t1 is the temperature of the long branch thermocouple, and t2 is the temperature of the short branch thermocouple;

[0036] S5: The bonding mixture to be injected is continuously injected into the furnace by using a coal injection gun, and the amount of oxygen is adjusted by a PLC controller to increase the temperature so that the bonding mixture is heated and adhered to the furnace waist.

[0037] The furnace waist is thickened and protected by the bonding mixture, which effectively prevents the erosion of the furnace waist by slag or other impurities.

[0038] Scheme 5 is the optimal solution for the basic scheme, which is the optimization of the iron mouth area, including:

[0039] When tapping iron, use a rock drill to pre-drill the tap hole. The steps are as follows:

[0040] S1: Blowing the tap hole, using nitrogen and compressed air to blow away the accumulated slag and iron around the tap hole to maintain the mud jacket;

[0041] S2: Use a rock drill to drill the mud sleeve of the iron mouth for 1m, until the mud sleeve reaches the unsolidified part, and then fire the mud sleeve to observe whether there is any abnormality at the drill mouth;

[0042] S3: After baking, continue drilling the mud casing for 1m. When the mud casing turns red, use a rock drill to drill through the mud casing.

[0043] After the iron is tapped, the taphole is sealed with a tapping machine. The steps are as follows:

[0044] S1: Blow the taphole and use nitrogen or compressed air to blow away the accumulated slag and iron around the taphole to maintain the mud sleeve;

[0045] S2: Use a mud gun machine to drive the gun mud into the iron mouth area and squeeze the gun mud twice to increase the compactness of the gun mud.

[0046] The tap hole is pre-drilled in drilling mode, which effectively solves the problems of low temperature in the tap hole and poor sintering quality of the tap hole. After the iron is tapped, the tap hole is filled by segmented mud beating, which increases the compactness of the tap hole and enhances the sealing of the tap hole.

[0047] Solution 6: This is the optimal solution for optimizing the fabric distribution method, including:

[0048] Dynamic placing device is used for placing, and the ratio of ore to coke is 1:4;

[0049] Dynamically distribute the materials with one layer of ore and one layer of coke, with the ore distributed on the outside and the coke distributed on the inside to balance the combustion speed of the two materials.

[0050] Ore and coke have different melting points. Placing ore on the outer circle and coke on the inner circle, and arranging them in layers, can make the materials burn fully and evenly.

[0051] Scheme 7, which is the preferred option of Scheme 2, S3 specifically includes:

[0052] According to the gas sensor, the gas concentration value of the opening is measured;

[0053] If the gas concentration is less than 500ppm, the predicted crack area is 1m 2 , the grouting machine injects 9kg of grouting material into the corresponding area;

[0054] If the gas concentration is within the range of 500ppm-1000ppm, the predicted crack area is 2m 2 , the grouting machine injects 18kg of grouting material into the corresponding area;

[0055] If the gas concentration is within the range of 1000ppm-2000ppm, the predicted crack area is 3m 2 , the grouting machine injects 27kg of grouting material into the corresponding area;

[0056] If the gas concentration is greater than 2000ppm, the predicted crack area is 4m2 , the grouting machine injects 36kg of grouting material into the corresponding area.

[0057] By judging the crack area according to different gas concentrations and then repairing it, the target area can be clearly repaired, saving repair operation time and reducing leakage risks.

[0058] Scheme 8 is a preferred option of Scheme 4. S5 specifically includes:

[0059] The maximum oxygen content in the normal furnace is 500m 3 After the bonding mixture is sprayed into the furnace, adjust the oxygen concentration to 250m 3 , ensuring that the bonding mixture burns to adhere to the furnace waist;

[0060] According to the long-branch thermocouple, the temperature inside the furnace is measured;

[0061] When the temperature difference between the target area and the surrounding average temperature is within 50°C, adjust the oxygen content to 500m 3 to ensure that the oxygen content is adjusted to normal values ​​while the bonding mixture is fully burned.

[0062] The oxygen content before spraying the bonding mixture is 150m 3 , when the bonding mixture is sprayed, the oxygen content is increased to 250m 2 , so that the bonding mixture can be heated, burned and adhered to the furnace waist. When the bonding mixture is sprayed, the oxygen content is increased to 500m2, so that the bonding mixture can be completely adhered to the furnace waist.

[0063] Option 9 is the preferred option of Option 4. The selected bonding mixture is a coal powder mixture containing 10% titanium. Titanium carbide and titanium oxide are both high melting point compounds. They adhere to the furnace waist and form a strong protective layer that is not easily washed away by the furnace cleaning agent, which can effectively protect the furnace waist.

[0064] Scheme 10 is a preferred embodiment of Scheme 9. The coal powder particle size selected in the coal powder mixture is 200 mesh. The 200 mesh coal powder particles are very fine and uniform, which can improve energy utilization, reduce pollutant emissions, and achieve sufficient combustion. DETAILED DESCRIPTION

[0065] The present invention is further described in detail below through specific embodiments:

[0066] Embodiment 1

[0067] A method for rapid repair of erosion in a HYCROF blast furnace, wherein the preset grouting protection strategy includes:

[0068] First, several thermocouples are installed in different areas of the furnace cylinder, and the furnace temperature in different areas is detected by thermocouples. The real-time temperature is reflected in the control terminal through the PLC controller. Then, the remaining thickness of the furnace wall is calculated by the detected furnace temperature and the thermal conductivity of the furnace wall in the detected area using the formula q1=(1150-t1) / (s1 / λ1), q2=(t1-t2) / (s2 / λ2), where the heat flux intensity q=t / (s / λ), t is the temperature of the measuring point (℃), s is the thickness of the refractory material (mm), and λ is the thermal conductivity (w / m*k). Under ideal conditions, λ1= λ2, q1 = q2, the simplified heat transfer formula is (1150-t1) / (t1-t2) = s2 / s1, where s1 is the residual thickness and s2 is the distance between the two thermocouples. When λ1≠λ2, the values ​​of t1 and t2 change. At this time, it is judged that cracks occur in the target area. After finding the gap, the staff will open a hole near the gap. The size of the hole does not exceed 500mm. Then, the gas concentration value at the gap is detected by the gas sensor. According to the size of the detected gas concentration value, the corresponding amount of grouting material is filled: if the gas concentration value is less than 500ppm, the predicted crack area is 1m 2 , the grouting machine injects 9kg of grouting material into the corresponding area; if the gas concentration value is within the range of 500ppm-1000ppm, the predicted crack area is 2m 2 , the grouting machine injects 18kg of grouting material into the corresponding area; if the gas concentration value is within the range of 1000ppm-2000ppm, the predicted crack area is 3m 2 , the grouting machine injects 27kg of grouting material into the corresponding area; if the gas concentration is greater than 2000ppm, the predicted crack area is 4m 2 , the grouting machine injects 36kg of grouting material into the corresponding area. Similarly, for every 1000ppm increase in gas concentration, the predicted crack area increases by 1m 2 The amount of grouting material injected is increased by 9kg on the basis of the previous interval. After calculating the required amount of grouting material, the grouting material is injected from the opening into the inside through the grouting machine. After injecting the grouting material, the pressure is maintained for 10 minutes so that the grouting material can smoothly enter the cracks for filling. After filling, withdraw the grouting machine and seal the opening.

[0069] Embodiment 2

[0070] A method for quickly repairing corrosion in a HYCROF blast furnace, wherein the preset oxygen concentration adjustment strategy comprises:

[0071] First, the furnace temperature in the furnace area is detected by the long thermocouple installed on the furnace cylinder. Then the PLC controller transmits the detected furnace temperature to the control terminal, and the control terminal adjusts the valve opening size of the oxygen control valve according to different temperature ranges: if the furnace temperature is within the range of 300℃-400℃, the oxygen volume is reduced by 5m for every 20℃ increase in the furnace temperature. 3 / h, and adjust the oxygen regulating valve opening to 3-5 degrees; if the furnace temperature is within the range of 400℃-500℃, the oxygen volume will be reduced by 10m for every 20℃ increase in furnace temperature. 3 / h, and adjust the opening of the oxygen regulating valve to 7 degrees; if the temperature in the furnace is greater than 500℃, close the oxygen regulating valve and stop supplying oxygen. When the oxygen control valve is completely closed, open the nitrogen valve from the control terminal and balance the oxygen content in the furnace by inputting nitrogen.

[0072] Embodiment 3

[0073] A method for quickly repairing erosion in a HYCROF blast furnace, wherein the preset furnace waist protection strategy includes:

[0074] First, the long-branch thermocouple and short-branch thermocouple set at the furnace waist are used to detect the furnace temperature at two positions, and the real-time temperature is transmitted to the control terminal by the PLC controller. Then, the residual thickness of the furnace waist is calculated by the two furnace temperatures and thermal conductivity coefficients according to the formula: q1 = (1150-t1) / (s1 / λ1), q2 = (t1-t2) / (s2 / λ2), where the heat flux intensity is: q = t / (s / λ), t is the measuring point temperature (℃), λ1 and λ2 are the thermal conductivity of carbon bricks (w / m*k), s1 is the residual thickness, and s2 is the distance between the two thermocouples. Then, the PLC controller transmits the furnace temperature and thermal conductivity values ​​to the control terminal. After the control terminal calculates, the residual thickness at the furnace waist is measured, and then the residual thickness is calculated according to the formula: (T 界 -t1)(s1 / λ1)=(t1-t2) / (s2 / λ2), calculate the interface temperature between the carbon brick and the bonding mixture, where T 界 is the interface temperature between the carbon brick and the bonding mixture (℃), and then the PLC controller transmits the measured residual thickness value to the control terminal. After the control terminal calculates it, according to the formula: (1150-T 界 )(s 粘 / λ 粘 )=(t1-t2) / (s2 / λ2), measure the thickness of the bonding mixture that needs to be thickened at the furnace waist, where 1150 is the temperature of the isothermal solidified iron wire (℃), s 粘 is the thickness of the bonding mixture (mm), λ 粘is the thermal conductivity of the bonding mixture (w / m*k), s2 is the distance between the two thermocouples, λ2 is the thermal conductivity of the carbon brick: 12w / m*k, t1 is the temperature of the long branch thermocouple, and t2 is the temperature of the short branch thermocouple;

[0075] After calculating the thickness of the required thickening bonding mixture, the control terminal transmits a signal to the PLC controller. The maximum oxygen content in the normal furnace is 500m 3 First, close the oxygen regulating valve to reduce the oxygen content at the furnace waist to 150m 3 , and then remotely open the coal injection gun to spray the bonding mixture into the furnace. During the process of spraying the bonding mixture into the furnace, open the oxygen regulating valve to adjust the oxygen concentration to 250m 3 , ensure that the bonding mixture burns to adhere to the furnace waist, then monitor the furnace temperature through the thermocouple, when the temperature difference between the furnace waist area and the surrounding average temperature is within 50℃, adjust the oxygen content to 500m through the oxygen regulating valve 3 To ensure that the oxygen content is adjusted to a normal value when the bonding mixture is fully burned, so that the bonding mixture can be heated, burned and adhered to the furnace waist. The bonding mixture is a coal powder mixture containing 10% titanium, and the coal powder used is coal powder with a particle size of 200 mesh.

[0076] Embodiment 4

[0077] A method for quickly repairing erosion in a HYCROF blast furnace, wherein the optimization strategy for the iron mouth area includes:

[0078] When tapping iron, first use nitrogen and compressed air to purge the area near the iron mouth to blow away the accumulated slag and iron around the iron mouth, then use a rock drill to drill 1m of the mud sleeve at the iron mouth, and after drilling to the unsolidified part of the mud sleeve, bake the unsolidified mud sleeve, and observe whether there is any abnormality at the drill mouth. After baking, continue to drill the mud sleeve for 1m. When the mud sleeve turns red, it means that the thickness of the mud sleeve becomes weak. Then use a rock drill to break through the mud sleeve to achieve tapping. After tapping iron, first use nitrogen and compressed air to purge the iron mouth to blow away the accumulated slag and iron around the iron mouth, and then use a mud gun machine to drive the gun mud into the iron mouth area in batches, and squeeze the gun mud twice to increase the compactness of the gun mud.

[0079] Embodiment 5

[0080] A method for quickly repairing corrosion in a HYCROF blast furnace, wherein the optimization strategy for the material distribution method includes:

[0081] First, a signal is transmitted to the PLC controller through the control terminal, and the dynamic feeding device is remotely controlled to feed the materials into the furnace. When selecting materials, the staff sets the ratio of ore to coke to 1:4, and then feeds the materials in a layer of ore and a layer of coke. During the feeding process, the ore is fed on the outside and the coke is fed on the inside. During the combustion process, the combustion speeds of coke and ore are balanced to achieve an effect in which the actual feeding material layer is uniform and flat with a slightly concave center. In this way, the gasifier can have uniform and good air permeability and molten dripping performance to obtain high-quality molten iron and reduce fuel consumption.

[0082] The above is only an embodiment of the present invention, and the common knowledge such as the known specific structure and characteristics in the scheme is not described in detail here. It should be pointed out that for those skilled in the art, several deformations and improvements can be made without departing from the structure of the present invention, which should also be regarded as the protection scope of the present invention, and these will not affect the effect of the implementation of the present invention and the practicality of the patent. The scope of protection required by this application shall be based on the content of its claims, and the specific implementation methods and other records in the specification can be used to interpret the content of the claims.

Claims

1. A method for rapid repair of erosion in a HYCROF blast furnace, characterized in that: include: Preset grouting protection strategy, make predictions for target areas, calculate the amount of grouting required to fill cracks, and perform grouting maintenance; Preset oxygen concentration adjustment strategy to reduce oxygen concentration in the target area and reduce oxygen wear and erosion on furnace refractory materials; Preset furnace waist protection strategy, spray bonding mixture at the tuyere to strengthen the furnace protection locally; Optimize the taphole area, pre-drill the taphole area during tapping, and seal the taphole area with mud after tapping to improve the tapping effect; Optimize the material distribution method, adjust the material feeding sequence and position according to the different melting points and different landing points of different materials, and improve the liquid permeability of the furnace.

2. A method for rapid repair of HYCROF blast furnace corrosion according to claim 1, characterized in that: The steps of the grouting protection strategy are as follows: S1: Use several thermocouples to measure the furnace temperature in different areas; S2: Using the PLC controller, the residual thickness of different areas in the furnace is measured according to the temperature and thermal conductivity of each furnace; S3: When the temperature inside the furnace is measured to rise, the residual thickness will give the illusion of rising data. At this time, it is determined that a gap has occurred in the target area of ​​the furnace wall. The gas concentration in the target area is then detected, and the size of the gap is determined based on the gas concentration in the target area. According to the size of the gap, appropriate grouting treatment is performed on the cold and hot surfaces of the target area to improve the thermal conductivity.

3. A method for rapid repair of HYCROF blast furnace corrosion according to claim 1, characterized in that: Oxygen concentration adjustment strategy, including: The temperature inside the furnace is measured using a long-branch thermocouple; If the furnace temperature is within the range of 300℃-400℃, the oxygen volume shall be reduced by 5m3 for every 20℃ increase in furnace temperature. 3 / h, and adjust the oxygen regulating valve opening to 3-5 degrees; If the furnace temperature is within the range of 400℃-500℃, the oxygen volume shall be reduced by 10m3 for every 20℃ increase in furnace temperature. 3 / h, and adjust the oxygen regulating valve opening to 7 degrees; If the temperature inside the furnace is greater than 500°C, close the oxygen regulating valve, stop supplying oxygen, and open the nitrogen valve to allow nitrogen to flow into the furnace.

4. A method for rapid repair of HYCROF blast furnace corrosion according to claim 1, characterized in that: The steps of the furnace waist protection strategy are as follows: S1: Use long-branch thermocouple and short-branch thermocouple to measure the furnace temperature at the furnace waist; S2: Using the PLC controller, the residual thickness of the furnace waist is measured according to the temperature and thermal conductivity of each furnace; q1=(1150-t1) / (s1 / λ1) q2=(t1-t2) / (s2 / λ2) Heat flux intensity: q = t / (s / λ), where t is the temperature of the measuring point (°C), λ1 and λ2 are the thermal conductivity of the carbon brick (w / m*k), s1 is the residual thickness, and s2 is the distance between the two thermocouples; S3: Based on the remaining thickness, the interface temperature between the carbon brick and the bonding mixture is measured to find the required bonding mixture thickness: (T 界 -t1)(s1 / λ1)=(t1-t2) / (s2 / λ2) Where T 界 is the interface temperature between carbon brick and bonding mixture (°C); S4: According to the interface temperature, the required thickness of the bonding mixture is measured: (1150-T 界 )(s 粘 / l 粘 )=(t1-t2) / (s2 / λ2) Where 1150 is the temperature of the isothermal solidified iron wire (℃), s 粘 is the thickness of the bonding mixture (mm), λ 粘 is the thermal conductivity of the bonding mixture (w / m*k), s2 is the distance between the two thermocouples, λ2 is the thermal conductivity of the carbon brick: 12w / m*k, t1 is the temperature of the long branch thermocouple, and t2 is the temperature of the short branch thermocouple; S5: The bonding mixture to be injected is continuously injected into the furnace by using a coal injection gun, and the amount of oxygen is adjusted by a PLC controller to increase the temperature so that the bonding mixture is heated and adhered to the inner wall of the furnace waist.

5. A method for rapid repair of HYCROF blast furnace corrosion according to claim 1, characterized in that: Optimization of the taphole area, including: When tapping iron, use a rock drill to pre-drill the tap hole. The steps are as follows: S1: Blow the taphole and use nitrogen or compressed air to blow away the accumulated slag and iron around the taphole to maintain the mud sleeve; S2: Use a rock drill to drill the mud sleeve of the iron mouth for 1m, until the mud sleeve reaches the unsolidified part, and then fire the mud sleeve to observe whether there is any abnormality at the drill mouth; S3: After baking, continue drilling the mud casing for 1m. When the mud casing turns red, use a rock drill to drill through the mud casing. After the iron is tapped, the taphole is sealed with a tapping machine. The steps are as follows: S1: Blow the taphole and use nitrogen or compressed air to blow away the accumulated slag and iron around the taphole to maintain the mud sleeve; S2: Use a mud gun machine to drive the gun mud into the iron mouth area and squeeze the gun mud twice to increase the compactness of the gun mud.

6. A method for rapid repair of HYCROF blast furnace corrosion according to claim 1, characterized in that: Optimize the fabric distribution method, including: Dynamic placing device is used for placing, and the ratio of ore to coke is 1:4; Dynamically distribute the materials with one layer of ore and one layer of coke, with the ore distributed on the outside and the coke on the side to balance the combustion speed of the two materials.

7. A method for rapid repair of HYCROF blast furnace corrosion according to claim 2, characterized in that: S3 specifically includes: According to the gas sensor, the gas concentration value of the opening is measured; If the gas concentration is less than 500ppm, the predicted crack area is 1m 2 , the grouting machine injects 9kg of grouting material into the corresponding area; If the gas concentration is within the range of 500ppm-1000ppm, the predicted crack area is 2m 2 , the grouting machine injects 18kg of grouting material into the corresponding area; If the gas concentration is within the range of 1000ppm-2000ppm, the predicted crack area is 3m 2 , the grouting machine injects 27kg of grouting material into the corresponding area; If the gas concentration is greater than 2000ppm, the predicted crack area is 4m 2 , the grouting machine injects 36kg of grouting material into the corresponding area.

8. A method for rapid repair of HYCROF blast furnace corrosion according to claim 4, characterized in that: S5 specifically includes: The maximum oxygen content in the normal furnace is 500m 3 After the bonding mixture is sprayed into the furnace, adjust the oxygen concentration to 250m 3 , ensuring that the bonding mixture burns to adhere to the furnace wall; According to the long-branch thermocouple, the temperature inside the furnace is measured; When the temperature difference between the target area and the surrounding average temperature is within 50°C, adjust the oxygen content to 500m 3 to ensure that the oxygen content is adjusted to normal value when the pulverized coal is fully burned.

9. A method for rapid repair of HYCROF blast furnace corrosion according to claim 4, characterized in that: The bonding mixture selected was a coal powder mixture containing 10% titanium.

10. A method for rapid repair of HYCROF blast furnace corrosion according to claim 9, characterized in that: The coal powder particle size selected in the coal powder mixture is 200 mesh.