TWI481722B - Method for determining permeability of lower part of a blast furnace and system using the same - Google Patents

Description

Method for judging liquid permeability of blast furnace furnace and judgment system

The present invention relates to a judging method and judging system.

The blast furnace for iron making is a reactor containing a gaseous state, a liquid state, and a solid state. In the lower part of the furnace in the blast furnace, the deadman accumulates coke solids that have not yet participated in the reaction. The porosity of the core and the solidification of the iron slag will affect the airflow distribution in the lower part of the furnace and the flow of molten iron, which will affect the erosion condition, the iron output and the quality of the molten iron in the hearth of the blast furnace. In short, the condition of the core is related to the iron production capacity and the furnace life of the hearth. If you can effectively grasp the condition of the furnace core and manage the hearth, it can effectively increase the production capacity and extend the life of the furnace. However, the condition of the core is not clearly characterized during the gradual deterioration, until the condition of the core has deteriorated severely.

By directly measuring the data available for judging by means of actual measurement, the condition of the core can be accurately determined. One of the actual measurement methods is to measure the depth of the wind-diameter area from the blast furnace by using the iron rod in the state where the blast furnace is suspended, and at the same time, test the looseness of the wind-diameter area, and carry out sampling analysis of the furnace core coke. By observing the size and radial distribution of coke powder, the amount of unburned pulverized coal and the amount of retained iron slag, to judge the condition of the core and Evaluate coke quality and pulverized coal combustion. However, the above method must not achieve the effect of monitoring the condition of the blast furnace core in a state where the blast furnace is suspended.

Another method of actual measurement is to use the microwave to measure the radial temperature distribution and the measurement depth from the upper part of the blast nozzle in the state of the blast furnace operation, or to observe the molten iron in the furnace core area by using the radioactive substance as a tracer. The flow path and the coke displacement speed at different positions are used to judge the condition of the core. However, the above method may reduce the accuracy of judging the condition of the core due to a large number of interference factors.

On the other hand, in the absence of direct measurement for the judgement, it is no longer possible to maintain good furnace conditions by adjusting the blast furnace operation only by observing the characterization that the furnace core condition has deteriorated severely.

In view of the above problems, there has been a method for estimating the condition of the core, and it has been judged whether the condition of the core has begun to deteriorate, so as to facilitate timely adjustment of the operation mode of the blast furnace, thereby maintaining good furnace conditions.

One example of conventional techniques is to define the deadman cleanliness index (DCI) by using the difference between the actual carbon content and the saturated carbon content of the molten iron, the molten iron temperature and the salt base. Among them, the difference between the carbon content of molten iron and the content of saturated carbon indicates the cleanliness of the core, and the flow of iron slag in the core is represented by the temperature of molten iron and the base of the salt. The disadvantage of this method is that the furnace core purity index has a large variation range and the correlation with the furnace core condition is not high.

Another example of the prior art utilizes the difference in flow resistance coefficients of the flow and exhaust of iron slag to measure the activity of the hearth. The disadvantage of this method is that the flow resistance coefficient of the inflow and discharge of iron slag cannot be accurately obtained in the state in which the blast furnace is operated, so it is not suitable for immediate monitoring.

Another example of the prior art is to define the activity index of the hearth by the ratio of the weight of the hearth to the weight of the hearth, as a reference for adjusting the gas distribution in the lower part of the furnace, and then to determine the condition of the core. However, in addition to the temperature of the molten iron, the temperature at the bottom of the furnace and the temperature of the hearth are affected by the thickness of the residual carbon brick in the furnace, the composition and thickness of the solidified layer of the iron slag on the surface of the carbon brick, and the cooling conditions. The method cannot accurately assess the condition of the core.

Therefore, an aspect of the present invention provides a method for determining the liquid permeability of a lower portion of a blast furnace and a system thereof, which can determine the liquid permeability of the lower portion of the blast furnace according to the temperature of the molten iron on the line, and serve as a reference for the adjustment of the blast furnace, and further Maintain good furnace conditions and high production capacity.

According to the above object of the present invention, a method for determining the liquid permeability of a lower portion of a blast furnace is proposed, which comprises: performing a model establishment stage for establishing a molten iron temperature model based on a plurality of historical hot metal temperature data and a plurality of historical blast furnace operating condition data. The model establishment stage includes: providing the historical hot metal temperature data; providing historical blast furnace operating condition data, wherein the historical hot metal temperature data is one-to-one corresponding to the historical blast furnace operating condition data, each of which Historical blast furnace operating conditions data includes historical blast temperature, historical blast humidity, historical blast enrichment, historical blast furnace coal injection rate, historical blast volume, historical flame temperature, historical blast coke rate and historical iron strontium content; These historical hot metal temperature data and these historical blast furnace operating conditions data are subjected to a regression analysis algorithm to obtain a relationship equation between molten iron temperature and blast furnace operating conditions; and an online analysis stage to utilize the relationship equation between molten iron temperature and blast furnace operating conditions. To judge the lower part of the blast furnace Liquid permeability, wherein the online analysis stage comprises: detecting the temperature of the molten iron on the line of the blast furnace; obtaining the online blast furnace operating condition data corresponding to the online molten iron temperature, wherein the online blast furnace operating condition data includes the online blast temperature and the online blast humidity , online blast enrichment, on-line blast furnace injection rate, on-line blast volume, on-line flame temperature, on-line blast furnace coke rate and on-line hot metal bismuth content; using online blast furnace operating conditions data and relationship between molten iron temperature and blast furnace operating conditions Calculate the reference value of the molten iron temperature; and perform a liquid permeability judgment step to judge the liquid permeability of the lower portion of the blast furnace according to the reference value of the molten iron temperature and the temperature of the molten iron on the line.

According to an embodiment of the present invention, the relationship between the above molten iron temperature and the blast furnace operating condition is: HMT _cal =1508 + 0.00796 * BT - 0.188 * BM + 2.526 * O2R - 0.237 * PCR + 0.0113 * BV - 0.000681 * TFT - 0.176 *CR+73.48*Si; where HMT _cal is molten iron temperature, BT is blast temperature, BM is blast humidity, O2R is blast enriched oxygen, PCR is blast furnace coal injection rate, BV is blast volume, TFT is Blast furnace flame temperature, CR is the blast furnace coke rate, and Si is the amount of molten iron.

According to still another embodiment of the present invention, the liquid permeability determining step comprises: subtracting the reference value of the molten iron temperature from the hot metal temperature on the line to obtain the temperature difference index of the molten iron; and determining the lower part of the furnace of the blast furnace according to the temperature difference index of the molten iron Liquid.

According to still another embodiment of the present invention, the liquid permeability determining step further comprises: when the value of the molten iron temperature difference index is a negative value, performing a furnace core activation step to activate the furnace core of the blast furnace.

According to the above object of the present invention, a system for determining the liquid permeability of a lower portion of a blast furnace is proposed, which comprises a model building module, a data capturing module and a liquid permeability determining module. The model building module is used for performing regression analysis algorithms on a plurality of historical molten iron temperature data and a plurality of historical blast furnace operating condition data to obtain a relationship equation between molten iron temperature and blast furnace operating conditions, wherein the historical hot metal temperature data is one For each of the historical blast furnace operating conditions data, each of these historical blast furnace operating conditions data includes historical blast temperature, historical blast humidity, historical blast enrichment, historical blast furnace coal injection rate, historical blast volume, historical flame Temperature, historical blast furnace coke rate and historical iron strontium content. The data acquisition module is used to obtain the online blast furnace operating condition data corresponding to the blast furnace wire temperature and the wire temperature of the wire. The online blast furnace operating condition data includes the online blast temperature, the online blast humidity, and the online blast enrichment. Volume, on-line blast furnace coal injection rate, on-line blast volume, on-line flame temperature, on-line blast furnace coke rate and on-line hot metal strontium content. The liquid permeability determining module is configured to judge the liquid permeability of the lower portion of the blast furnace according to the relationship between the molten iron temperature and the operating conditions of the blast furnace, the operating conditions of the blast furnace on the line, and the temperature of the hot metal on the line.

According to an embodiment of the present invention, the relationship between the above molten iron temperature and the blast furnace operating condition is: HMT _cal =1508 + 0.00796 * BT - 0.188 * BM + 2.526 * O2R - 0.237 * PCR + 0.0113 * BV - 0.000681 * TFT - 0.176 *CR+73.48*Si; where HMT _cal is molten iron temperature, BT is blast temperature, BM is blast humidity, O2R is blast enriched oxygen, PCR is blast furnace coal injection rate, BV is blast volume, TFT is Blast furnace flame temperature, CR is the blast furnace coke rate, and Si is the amount of molten iron.

According to still another embodiment of the present invention, the liquid permeability determining module comprises a molten iron temperature difference index calculating module and a molten iron temperature difference index processing module. The hot water temperature difference index calculation module is used to subtract the hot metal temperature reference value from the hot metal temperature to obtain the hot water temperature difference index. The hot metal temperature difference index processing module is used to judge the liquid permeability of the lower part of the blast furnace according to the temperature difference index of the molten iron.

According to still another embodiment of the present invention, when the value of the molten iron temperature difference index is a negative value, the liquid permeability determining module determines that the liquid permeability of the lower portion of the blast furnace is deteriorated and issues a warning message.

According to still another embodiment of the present invention, the warning message is a voice message or a text message.

100‧‧‧ blast furnace

102‧‧‧Feeding device

104‧‧‧ blaster

106‧‧‧ hearth

108‧‧‧iron outlet

110‧‧‧ furnace core

200‧‧‧ liquid permeability judgment method

210‧‧‧Model establishment stage

212‧‧‧Historical data providing steps

214‧‧‧Regression analysis calculation steps

220‧‧‧Online analysis stage

222‧‧‧ Online hot metal temperature data acquisition steps

224‧‧‧Steps for obtaining online blast furnace operation data

226‧‧‧Metal water temperature reference value calculation steps

228‧‧‧The lower liquid permeability judgment step

400‧‧‧ liquid permeability judgment system

410‧‧‧Model building module

420‧‧‧ data capture module

430‧‧‧ liquid permeability judgment module

432‧‧‧Iron temperature difference indicator calculation module

434‧‧‧Iron temperature difference indicator processing module

The above and other objects, features, advantages and embodiments of the present invention will become more apparent and understood.

Fig. 2 is a schematic view showing the flow of a liquid permeability determining method in a lower portion of a blast furnace according to an embodiment of the present invention.

FIG. 3A is a schematic diagram showing the temperature difference index of molten iron obtained by the verification performed by the embodiment of the present invention.

Fig. 3B is a schematic view showing the coke strength obtained by the verification performed in the examples of the present invention.

Fig. 3C is a schematic view showing the average particle diameter of coke obtained by the verification performed in the examples of the present invention.

Fig. 3D is a schematic view showing the temperature of the hearth obtained by the verification performed in the embodiment of the present invention.

Fig. 3E is a schematic view showing the temperature of the hearth obtained by the verification performed in the embodiment of the present invention.

Fig. 4 is a schematic view showing the liquid permeability determining system of the lower portion of the blast furnace according to the embodiment of the present invention.

Please refer to FIG. 1 , which is a schematic diagram of a blast furnace. The blast furnace 100 mainly includes a charging device 102, a blower 104, a hearth 106, and a taphole 108. The main structure of the blast furnace 100 is a hollow reactor in which an refractory material is built in an iron shell and a cooling system. The charging device 102 is located at the top of the blast furnace 100, and the blast nozzle 104, the hearth 106, and the taphole 108 are located in the lower portion of the blast furnace 100. The charging device 102 provides a path for iron-making raw materials such as sinter, lump ore, or pellets to enter the blast furnace 100 furnace, such as iron ore and flux. The blower nozzle 104 is a passage for the hot air required for the iron making process to enter the inside of the blast furnace 100. Unreacted coke forms a core 110 on the hearth 106. In addition, molten iron and slag which are generated after the reaction are also present on the hearth 106. The refractory materials of the hearth 106 and the bottom of the furnace are mainly carbon bricks. The taphole 108 is the path through which the molten iron passes. In the course of the operation, the ironmaking raw material is first introduced into the furnace from the charging device 102 located in the top region of the blast furnace 100. Then, during the process in which the ironmaking raw material is lowered in the furnace, heat exchange and reduction reactions are performed with the hot air blown by the blast nozzle 104. The molten iron and slag produced by the reaction flow into the hearth 106, and then flow out of the furnace outlet 108 to the outside of the furnace. The molten iron produced by the above steps can be used in the subsequent steel making process.

In Fig. 1, the condition of the core 110 affects the flow of iron slag and the reaction of the lower part of the furnace, and the result of the reaction of the lower part of the furnace also affects the core. The condition of 110. The combined heat changes produced in the ironmaking process are reflected in the temperature of the molten iron. Therefore, by knowing the temperature of the molten iron, the liquid permeability of the lower portion of the blast furnace 110 can be indirectly determined.

Please refer to FIG. 2 , which is a schematic flow chart of a method 200 for determining the liquid permeability of a lower portion of a blast furnace according to an embodiment of the present invention. The method for judging the liquid permeability of the lower portion of the blast furnace is used to immediately monitor the liquid permeability of the lower portion of the blast furnace 100. The method 200 for determining the liquid permeability of the lower portion of the blast furnace includes a model establishment phase 210 and an online analysis phase 220. The model establishment stage 210 establishes a relationship equation between the molten iron temperature and the blast furnace operating conditions based on historical hot metal temperature data and historical blast furnace operating condition data. The in-line analysis step 220 determines the liquid permeability of the lower portion of the blast furnace 100 by the relationship equation between the molten iron temperature and the blast furnace operating conditions. In the present invention, the historical molten iron temperature data and the historical blast furnace operating condition data refer to the molten iron temperature data obtained in the previous operation and the blast furnace operating condition data used.

In the model establishment phase 210, a historical data providing step 212 is first performed to provide a plurality of historical hot metal temperature data and a complex array of historical blast furnace operating condition data. Historical hot metal temperature data is one-to-one correspondence to historical blast furnace operating conditions. Each set of historical blast furnace operating conditions data includes historical blast temperature, historical blast humidity, historical blast enrichment, historical blast coal injection rate, historical blast volume, historical flame temperature, historical blast coke rate, and historical hot metal strontium content. . For example, when a molten iron temperature data is recorded, when the molten iron temperature data is recorded, the blast temperature, blast humidity, blast enrichment, blast furnace coal injection rate, blast volume, flame temperature blast furnace used in the blast furnace The coke rate and the content of molten iron are also recorded as the temperature data of the molten iron. Historical blast furnace operating conditions data.

Next, a regression analysis calculation step 214 is performed to perform a regression analysis algorithm on the historical molten iron temperature data and the historical blast furnace operating condition data to obtain a relationship equation between the molten iron temperature and the blast furnace operating conditions. The equation for the relationship between molten iron temperature and blast furnace operating conditions can be expressed as follows: HMT _cal = F (BT, BM, O2R, PCR, BV, TFT, CR, Si), (1)

Among them, HMT _cal represents the reference value of molten iron temperature, F function is a function related to blast furnace operating conditions, BT represents blast temperature (unit is °C), BM represents blast humidity (unit is g/Nm ³ ), and O2R represents drum Wind rich oxygen (in %), PCR represents blast furnace coal injection rate (in kg/THM), BV represents blast volume (unit: Nm ³ /min), TFT represents blast furnace flame temperature (unit is °C), CR represents The blast furnace coke rate (in kg/THM), and Si represents the amount of strontium in molten iron (in %).

In the embodiment of the present invention, the relationship between the molten iron temperature and the blast furnace operating condition obtained by regression calculation of the historical molten iron temperature data and the historical blast furnace operating condition data is: HMT _cal =1508+0.00796*BT-0.188*BM+2.526* O2R-0.237*PCR+0.0113*BV-0.000681*TFT-0.176*CR+73.48*Si. (2)

It should be noted that the above relationship between the molten iron temperature and the blast furnace operating conditions is not intended to limit the scope of the present invention. Those skilled in the art can make corresponding adjustments (such as adjustment coefficients or constants) for the above equations according to various factors, such as historical hot metal temperature data and historical blast furnace operating condition data. For example, when the blast furnace is aged, the shape of the blast furnace The state may change, so those skilled in the art may perform a model establishment phase 210 again to establish a new relationship equation.

After the model establishment phase 210 is completed, an online analysis phase 220 is then performed. First, an online hot metal temperature data obtaining step 222 is performed to detect the hot metal temperature of the blast furnace 100. The on-line molten iron temperature refers to the temperature of the molten iron produced after the ironmaking raw material is reacted in the blast furnace 100. Next, an online blast furnace operation data acquisition step 224 is performed to obtain online blast furnace operating condition data corresponding to the online molten iron temperature. The online blast furnace operating conditions data is the blast furnace operating conditions data used in the ongoing iron making process. Similarly, the online blast furnace operating conditions data includes the blast temperature in use, blast humidity, blast enrichment, blast furnace coal injection rate, blast volume, flame temperature, blast furnace coke ratio, and hot metal hydrazine content.

After obtaining the online hot metal temperature and the online blast furnace operating condition data, the molten iron temperature reference value calculation step 226 is followed by using the online blast furnace operating condition data and the relationship between the molten iron temperature and the blast furnace operating condition to calculate the molten iron temperature reference value. That is, all parameters of the online blast furnace operating condition data are substituted into the relationship equation between the molten iron temperature and the blast furnace operating condition to calculate the molten iron temperature reference value.

Then, the lower portion liquid permeability determining step 228 is performed, and the liquid permeability of the lower portion of the blast furnace is judged based on the calculated reference value of the molten iron temperature and the temperature of the hot metal on the line. Use the following relationship to calculate the temperature difference of molten iron: DHMT_Index=HMT _act -HMT _cal , (3)

Among them, DHMT_Index represents the temperature difference of molten iron, and HMT _act represents the hot metal temperature of the line. After obtaining the temperature difference index of molten iron, the liquid permeability of the lower part of the blast furnace 100 can be judged according to the temperature difference index of molten iron.

The explanation of the liquid permeability of the lower portion of the blast furnace 100 can be determined by the temperature difference index of the molten iron obtained in the embodiment of the present invention as follows. Returning to Fig. 1, the upper part of the core 110 is a place for providing heat exchange and reaction between high temperature gas, iron slag and coke. When the iron slag flows to the lower portion of the core 110, there is no additional heat source. On the other hand, the reaction of the iron slag flowing through the furnace core 110, including the water-melting carbon reaction and the reduction reaction of the oxide in the iron slag, is a strong endothermic reaction, which causes the temperature of the molten iron to decrease. When the heat source in the blast furnace 110 is insufficient, the iron oxide is solidified between the cokes of the furnace core 110 after reduction, resulting in inactivation of the furnace core 110. To re-melt the solidified material deposited on the core 110, a large amount of heat energy needs to be added.

As described above, when the condition of the core 110 is better, the temperature of the core 110 is higher, so that when the iron slag flows through the core 110, more heat energy can be obtained, and less reduction reaction occurs, and the temperature of the molten iron is lower. Thus rising, and the temperature difference of molten iron showed a positive value. Conversely, when the core 110 is in poor condition, the temperature of the core 110 is low, so that the heat energy obtained when the iron slag flows through the core 110 is less, the temperature of the molten iron is lowered, and the temperature difference of the molten iron exhibits a negative value. In the activation process of the furnace core 110, the iron slag will react with the fine coke on the furnace core 110, or the coagulum between the cokes will be melted, and the temperature of the molten iron will also be low.

Please refer to FIGS. 3A-3C , which are schematic diagrams showing the temperature difference index, coke strength and average particle diameter of the molten iron obtained by the verification from September 2010 to March 2012 in the embodiment of the present invention. Judging from the giant view, in the 3A map, the temperature difference index of molten iron showed a downward trend between September 2010 and March 2011, and then in the 2011 From April to November 2011, there was an upward trend, and finally it showed a downward trend between December 2011 and March 2012. In Figure 3B, the coke intensity showed a downward trend between September 2010 and March 2011, and then showed an upward trend between April 2011 and November 2011, and finally in the West. There was a downward trend between December 2011 and March 2012. As far as the average coke particle size is concerned, as shown in Figure 3C, the average coke particle size tends to increase slowly until November 2011, and it did not decrease until December 2011. Comparing the trends presented in Figures 3A to 3C, it can be seen that the trend of the temperature difference index of molten iron, the strength of coke and the average particle size of coke is approximately the same from April 2011. Therefore, there is a considerable correlation between the temperature difference between molten iron and the quality of coke.

Please refer to FIGS. 3D and 3E simultaneously, which are schematic diagrams showing the hearth temperature and the bottom temperature obtained by the verification of the embodiment of the present invention from September 2010 to March 2012. During the period from September 2010 to December 2010, the upper part of the furnace core 110 was in good condition, so that the iron slag could pass through the furnace core smoothly, and the contact time between the iron slag and the coke was short, the manganese reduction reaction and the molten carbon reaction Less complete. On the other hand, the high-temperature gas in the wind-diameter area (not shown) in the blast furnace 100 can smoothly penetrate the furnace core 110 and exchange heat with the coke in the furnace core 110, so that more heat can be obtained when the iron slag passes. In addition, the reduction reaction has a lesser relationship, and the degree of temperature drop of the molten iron is limited, so that the temperature difference index of the molten iron is maintained at a higher level. And because the hot metal of high temperature can pass through the core 110 to the bottom of the furnace, the temperature of the bottom of the furnace rises and the temperature of the hearth drops, such as 3D and 3E. The figure shows. Therefore, during the period from September 2010 to December 2010, the liquid permeability of the lower portion of the furnace is better.

Then, during the period from January 2011 to March 2011, the condition of the upper part of the furnace core 110 turned poor, the coke fine powder in the furnace core 110 increased, the contact time between the iron slag and the coke was extended, and the manganese was reduced. The reaction and the molten carbon reaction become more complete. However, since the liquid permeability of the lower portion of the furnace core 110 is changed to a poor relationship, the amount of molten iron flowing to the bottom of the furnace is also reduced, and the amount of molten iron flowing directly to the tap hole 108 without passing through the molten iron at the bottom of the furnace is increased. At this time, the temperature difference index of molten iron gradually turned negative, the temperature at the bottom of the furnace gradually increased, and the temperature of the hearth gradually decreased, as shown in Figures 3D and 3E. Therefore, during the period from January 2011 to March 2011, the liquid permeability of the lower part of the furnace gradually deteriorated.

In April 2011, the furnace core activation process was carried out. First, the condition of the upper part of the furnace core 110 was changed to be better, so that the amount of iron slag flowing through the furnace core 110 gradually increased, and the iron slag gradually decomposed and accumulated in the furnace core. The fine coke and iron slag condensation of 110 causes the coke of the furnace core 110 to be gradually replaced by the outside of the furnace core 110, and the depth of the high temperature gas penetrating the furnace core 110 in the wind tunnel area (not shown) gradually deepens. The amount of penetration is also gradually increased, and the activation of the core 110 is accelerated. All of the above are strong endothermic reactions. Therefore, during the activation process of the furnace core, the liquid permeability of the lower part of the furnace is better changed, the temperature of the molten iron is lower than the normal state, and as shown in the 3A, 3D and 3E diagrams, the temperature difference index of the molten iron tends to be negative. The temperature at the bottom of the furnace gradually increased and the temperature of the hearth decreased slightly.

In addition, under the extreme deterioration of the condition of the furnace core 110, the high temperature gas in the wind diameter region (not shown) is not easy to penetrate the furnace core 110, and the coke at the furnace core 110 The temperature is then lowered, and the amount of iron slag flowing through the furnace core 110 is gradually reduced, and most of the iron slag flows on the outside of the furnace core 110, so that the chance of contact between the iron slag and the coke is reduced. However, since the time during which the iron slag falls directly to the hearth 106 becomes shorter, although the chance of the iron slag directly exchanges heat with the high temperature gas is increased, since the heat transfer efficiency between the liquid and the gas is inferior to that between the liquid and the solid, The temperature of the molten iron is lower than the normal state, the temperature difference of the molten iron is negative, the temperature of the top of the blast furnace 100 is increased, and the heat load of the ventilating zone of the blast furnace 100 is increased.

In August 2011, because the temperature of the bottom of the furnace continued to be high, the titanium-containing additive was used to avoid the excessive temperature of the furnace bottom and reduce the service life of the blast furnace 100. However, after the addition of the titanium-containing additive, the liquid permeability of the lower portion of the core 110 is deteriorated. Therefore, in October 2011, the ironmaking process was changed to the full-focus operation mode to improve the condition of the upper part of the furnace core 110, and the condition of the lower part of the furnace core 110 was still poor. As shown in Figures 3A, 3D and 3E, the temperature difference of the molten iron is maintained at a positive value, the temperature at the bottom of the furnace is gradually increased, and the temperature of the hearth and the temperature at the bottom of the furnace are also lowered.

Based on the above-mentioned long-term verification, it is found that the correlation between the temperature difference index of molten iron and the condition of the core is high. Therefore, the liquid permeability of the lower part of the furnace can be judged according to the temperature difference index of molten iron. If the index is abnormal, the operating factor of the iron making process can be adjusted immediately. To maintain the furnace condition of the blast furnace.

Please refer to FIG. 4, which is a schematic diagram showing a liquid permeable determination system 400 for a lower portion of a blast furnace according to an embodiment of the present invention. The judging system 400 is used to instantly monitor the liquid permeability of the lower portion of the blast furnace 100. The judgment system 400 includes a model building module 410, a data capturing module 420, and a liquid permeability determining module 430. The model building module 410 is linked to the historical hot metal temperature data and calendar in step 214. The blast furnace operating condition data is subjected to a regression analysis algorithm to obtain a relationship equation between the molten iron temperature and the blast furnace operating condition, as shown in the formula (2). The data acquisition module 420 is configured to obtain the online blast furnace operating condition data corresponding to the line hot metal temperature and the line hot metal temperature of the blast furnace 100 in steps 222 and 224. The liquid permeability determining module 430 is configured to determine the liquid permeability of the lower portion of the blast furnace according to the relationship between the molten iron temperature and the blast furnace operating condition equation, the online blast furnace operating condition data, and the line hot metal temperature. The liquid permeability determining module 430 includes a molten iron temperature difference index calculating module 432 and a molten iron temperature difference index processing module 434. The hot metal temperature difference index calculation module 432 is in step 226, and the hot metal temperature is subtracted from the hot metal temperature reference value as shown in the formula (3) to obtain the hot metal temperature difference index. The hot metal temperature difference index processing module 434 is in step 228, and determines the liquid permeability of the lower portion of the blast furnace 100 based on the molten iron temperature reference value and the on-line hot metal temperature.

In one embodiment, if the temperature difference index of the molten iron is a negative value, the liquid permeability determining module determines that the liquid permeability of the lower portion of the blast furnace is deteriorated, and a warning message can be issued. This warning message can be a voice message or a text message.

In the embodiment disclosed in the present invention, the liquid permeability of the lower portion of the blast furnace can be judged according to the temperature of the molten iron on the line in the iron making process. Compared with the prior art, the embodiment of the invention can achieve the effect of accurately determining the furnace condition of the blast furnace without first stopping the furnace, and increases the convenience of operation. In addition, the judgment result can also be used as a reference for blast furnace adjustment, thereby maintaining good furnace conditions and high productivity.

In addition, the method 200 for determining the liquid permeability of the lower portion of the blast furnace of the above embodiment can be implemented by using a computer program product, which can include a machine readable medium storing a plurality of instructions, which can program a computer (for example, The central control computer of the blast furnace) achieves the high embodiment of the above embodiment The liquid permeability determining system 400 of the lower portion of the furnace is a step of the method 200 for determining the liquid permeability of the lower portion of the blast furnace. The machine readable medium can be, but is not limited to, a floppy disk, a CD, a CD-ROM, a magneto-optical disk, a read-only memory, a random access memory, an erasable programmable read only memory (EPROM), or an electronic Erasable programmable read only memory (EEPROM), optical card or magnetic card, flash memory, or any machine readable medium suitable for storing electronic instructions. Furthermore, the embodiment of the present invention can also be downloaded as a computer program product, which can be transferred from the remote computer to the requesting computer by using a data signal of a communication connection (such as a connection such as a network connection).

Although the present invention has been disclosed in the above embodiments, it is not intended to limit the present invention, and the present invention can be modified and modified without departing from the spirit and scope of the present invention. The scope is subject to the definition of the scope of the patent application attached.

200‧‧‧ liquid permeability judgment method

210‧‧‧Model establishment stage

212‧‧‧Historical data providing steps

214‧‧‧Regression analysis calculation steps

220‧‧‧Online analysis stage

222‧‧‧ Online hot metal temperature data acquisition steps

224‧‧‧Steps for obtaining online blast furnace operation data

226‧‧‧Metal water temperature reference value calculation steps

228‧‧‧The lower liquid permeability judgment step

Claims (9)

A method for judging the liquid permeability of a lower portion of a blast furnace comprises: performing a model establishment stage for establishing a relationship equation between the temperature of the molten iron and the operating condition of the blast furnace according to the historical hot metal temperature data of the plurality of pens and the historical operating conditions of the plurality of historical blast furnaces, The model establishment stage includes: providing the historical hot metal temperature data; providing the historical blast furnace operating condition data, wherein the historical hot metal temperature data is one-to-one corresponding to the historical blast furnace operating condition data, each of the Some historical blast furnace operating conditions data include a historical blast temperature, a historical blast humidity, a historical blast enrichment, a historical blast furnace rate, a historical blast volume, a historical flame temperature, a historical blast coke rate, and a historical hot metal sputum content; and a regression analysis algorithm for the historical hot metal temperature data and the historical blast furnace operating condition data to obtain a relationship equation between the molten iron temperature and the blast furnace operating condition; and performing an online analysis phase To determine the blast furnace by using the relationship between the temperature of the molten iron and the operating conditions of the blast furnace The liquid permeability of the lower part of the furnace, wherein the online analysis stage comprises: detecting the temperature of the molten iron on one of the blast furnaces; obtaining the operating conditions of the blast furnace on the line corresponding to the temperature of the molten iron on the line, wherein the online blast furnace operating condition data comprises an online line Blasting temperature, first-line blast humidity, first-line blast-enriched oxygen, first-line blast furnace coal injection rate, first-line blast volume, first-line flame temperature, first-line blast furnace coke rate, and first-line hot metal strontium content; Online blast furnace operating condition data and the relationship between the molten iron temperature and the blast furnace operating conditions to calculate a molten iron temperature reference value; And performing a liquid permeability determining step to determine the liquid permeability of the lower portion of the furnace of the blast furnace according to the reference value of the molten iron temperature and the temperature of the molten iron on the line. The method of claim 1, wherein the relationship between the temperature of the molten iron and the operating conditions of the blast furnace is: HMT _cal =1508 + 0.00796 * BT - 0.188 * BM + 2.526 * O2R - 0.237 * PCR + 0.0113 * BV - 0.000681 * TFT -0.176*CR+73.48*Si; where HMT _cal is the reference value of molten iron temperature, BT is the blast temperature, BM is the blast humidity, O2R is the blast enrichment, PCR is the blast furnace injection rate, BV is the drum Air volume, TFT is the blast furnace flame temperature, CR is the blast furnace coke rate, and Si is the molten iron containing strontium. The method of claim 1, wherein the liquid permeability determining step comprises: subtracting the reference value of the molten iron temperature from the temperature of the molten iron on the line to obtain a temperature difference index of molten iron; and determining according to the temperature difference index of the molten iron The lower part of the furnace of the blast furnace is liquid permeable. The method of claim 3, wherein the liquid permeability determining step further comprises: when the value of the molten iron temperature difference index is a negative value, performing a furnace activation step to activate the furnace core of the blast furnace. A judgment system for liquid permeability of a lower portion of a blast furnace, comprising: A model building module is configured to perform a regression analysis algorithm on a plurality of historical molten iron temperature data and a plurality of historical blast furnace operating condition data to obtain a relationship equation between molten iron temperature and blast furnace operating conditions, wherein the historical molten iron The temperature data is one-to-one corresponding to the historical blast furnace operating condition data, and each of the historical blast furnace operating condition data includes a historical blast temperature, a historical blast humidity, a historical blast enrichment, and a historical blast furnace spray. Coal rate, a historical blast volume, a historical flame temperature, a historical blast furnace coke rate, and a historical iron strontium content; a data capture module for obtaining the temperature of the molten iron on the line of the blast furnace and the temperature of the molten iron on the line Corresponding to one of the online blast furnace operating conditions data, wherein the online blast furnace operating condition data includes a line blast temperature, a line blast humidity, a line of blast enrichment, a line blast furnace coal injection rate, a line blast volume, a line of flame temperature, a blast furnace coke rate on the first line, and a hot metal bismuth content on the line; and a liquid permeability judging module for Temperature and operating conditions of the blast furnace relation equation, the data line and the furnace operating conditions to determine the temperature of hot metal line liquid-permeable lower portion of the blast furnace. The judgment system according to claim 5, wherein the relationship between the molten iron temperature and the blast furnace operating condition is: HMT _cal =1508+0.00796*BT-0.188*BM+2.526*O2R-0.237*PCR+0.0113*BV-0.000681* TFT-0.176*CR+73.48*Si; where HMT _cal is the reference value of molten iron temperature, BT is the blast temperature, BM is the blast humidity, O2R is the blast enrichment, PCR is the blast furnace injection rate, BV is The amount of air blown, TFT is the blast furnace flame temperature, CR is the blast furnace coke rate, and Si is the molten iron containing strontium. The judgment system of claim 5, wherein the liquid permeability determining module comprises: a molten iron temperature difference index calculation module, configured to subtract the molten iron temperature reference value from the line molten iron temperature to obtain an iron The water temperature difference index; and a molten iron temperature difference index processing module for judging the liquid permeability of the lower portion of the furnace according to the hot water temperature difference index. The judgment system according to claim 7, wherein when the value of the molten iron temperature difference index is a negative value, the liquid permeability determining module determines that the liquid permeability of the lower portion of the furnace of the blast furnace is deteriorated and issues a warning message. The judging system of claim 8, wherein the warning message is a voice message or a text message.