TWI564394B - Method of evaluating permeable property of deadman - Google Patents

Description

Method for evaluating liquid permeability of furnace core

The present invention relates to a method for assessing liquid permeability, and more particularly to a method for assessing liquid permeability of a furnace core.

In the blast furnace ironmaking process, coke can supply the heat energy required for ironmaking reaction and melting, and can be used as a reducing agent. Therefore, for the iron making process, coke is one of the important raw materials. However, the reacted coke system is stacked on the hearth of the bottom of the blast furnace, so that the iron slag must flow through the coke stack and can be discharged through the tap hole. When the iron slag flows through the coke pile, the coke pile will partially reduce the reaction and carburize with the iron slag, so that some of the coke will be decontaminated, but fresh coke is added at any time, so the coke pile always exists in the hearth. This coke heap is generally referred to as a "deadman." Among them, the coke particle size distribution will affect the porosity of the furnace core, and thus affect the flow path of the iron slag, and the iron slag can easily pass through the furnace core, so it is generally called "liquid permeability". If the liquid permeability is poor, the iron slag does not easily flow through the furnace core, and will flow to the periphery of the blast furnace, thereby increasing the scouring force of the iron slag directly with the hearth carbon brick, thereby reducing the service life of the carbon brick, and at the same time affecting the iron tapping operation and reducing Ironmaking efficiency of blast furnace.

Since the stack of coke cannot be controlled, the fine coke particles between the cokes must be decomposed in order to effectively solve the defects of the aforementioned coke pore shrinkage. Generally, to remove these fine coke particles, high-temperature molten iron must flow through and contact with the fine coke particles, and then the carburizing reaction can be carried out, and the outside of the furnace core is gradually removed to the inside to slowly restore the permeability of the furnace core. Liquid, so that high temperature molten iron can penetrate into the core. The "de-ization" described above is the so-called activated core.

However, due to the high-temperature ironmaking conditions, the state of the core of the blast furnace (that is, the liquid permeability of the furnace core referred to in the present invention) is difficult to be monitored immediately, and it is impossible to immediately adopt an appropriate treatment method, thereby failing to achieve the foregoing. Fine coke particles to activate the furnace core.

In view of this, it is not necessary to provide a method for evaluating the liquid permeability of the core to improve the drawbacks of the conventional method for evaluating the liquid permeability of the core.

Therefore, one aspect of the present invention provides a method for evaluating the liquid permeability of a furnace core, and the liquid permeability database can be used to evaluate the condition of the core, and an appropriate method can be adopted to promote the penetration of high temperature molten iron into the core. In order to improve the liquid permeability of the core, to extend the life of the blast furnace and improve the ironmaking efficiency.

According to one aspect of the invention, a method of assessing the liquid permeability of a furnace core is presented. This manufacturing method first performs the first modeling step. Wherein, the first modeling step first provides a first core of the first blast furnace, and the first core contains a plurality of first cokes. Then, the first coke is subjected to a first sampling step, and a sieving step is performed to form a plurality of second cokes, and the second cokes each have a plurality of first particle diameters. Next, the plurality of first iron slag points Do not place on each of the second cokes, and at each of the plurality of test temperatures, respectively detect the permeation results of each of the first iron slags for the second coke to establish a first liquid permeability database.

Wherein, the first iron slag has a first component, and the first liquid permeable database comprises the plurality of first particle sizes, the first component and the test temperature, and a plurality of corresponding penetration results.

After the modeling step, the second iron slag of the second blast furnace is provided, and the second component of the second iron slag is analyzed. After detecting the temperature of the molten iron in the second blast furnace, the first determining step is performed.

In the first determining step, the second component and the molten iron temperature are first input into the first liquid permeability database to determine the critical coke particle diameter at which the second iron slag is permeable to the molten iron temperature. Wherein the second component corresponds to one of the first components, and the temperature of the molten iron corresponds to one of the test temperatures.

Then, the temperature of the hearth of the second blast furnace is detected. If the temperature of the hearth is less than the temperature of the molten iron, the molten iron of the second blast furnace does not pass through the second core of the second blast furnace, and the particle size of the second core is smaller than the critical coke particle size. If the temperature of the hearth is equal to the temperature of the molten iron, the molten iron of the second blast furnace can pass through the second core, and the particle size of the second core is not less than the aforementioned critical coke particle size.

According to an embodiment of the present invention, when the coke pores of the second core are not less than 3 mm, the molten iron of the second blast furnace can pass through the second core.

According to another embodiment of the present invention, after performing the foregoing first determining step, the method selectively performs the second modeling step and the second determining step. The second modeling step is to perform a second sampling process on the first coke to obtain a plurality of third cokes, wherein the third cokes respectively have a particle size distributed. Then, one of the first iron slags is placed on each of the third cokes, and at the above-mentioned test temperature, the first iron slag permeation result is detected for each third coke to establish a first Two liquid permeability database. The second liquid permeability database includes a particle size distribution of the third coke, a first component and a test temperature, and a corresponding infiltration result.

Next, a second determination step is performed. In the second determining step, the second component and the molten iron temperature are first input into the second liquid permeability database to determine the permeability distribution of the second iron slag through the molten iron temperature. Wherein, the input second component corresponds to the first component, and the molten iron temperature corresponds to one of the aforementioned test temperatures.

Thereafter, the temperature of the hearth of the second blast furnace is detected. If the temperature of the hearth is less than the temperature of the molten iron, the molten iron of the second blast furnace does not pass through the second core. If the temperature of the hearth is equal to the temperature of the molten iron, the molten iron of the second blast furnace can pass through the second core, and the second core has the aforementioned permeability particle size distribution.

According to still another embodiment of the present invention, when the content of the coke fine powder of the second core is less than 10%, the molten iron of the second blast furnace can pass through the second core when the second core is 100%.

The method for evaluating the liquid permeability of the core of the furnace by using the invention first establishes a liquid permeability database, and the relationship between the iron slag composition in the blast furnace and the temperature of the molten iron, and the temperature of the hearth of the blast furnace and the temperature of the molten iron Further, the condition of the core in the blast furnace is further inferred, so that an appropriate improvement method can be adopted to promote the penetration of molten iron into the core to improve the liquid permeability of the furnace core.

100a/100b‧‧‧ method

110‧‧‧First modeling step

111‧‧‧Steps to provide the first core of the first blast furnace

113‧‧‧The first sampling step for the first coke and the step of the screening step

115‧‧‧ Steps of placing the first iron slag on each of the second cokes and detecting the penetration of the first iron slag on the second coke at the test temperature

117‧‧‧Steps to establish a first liquid permeable database

120‧‧‧Providing the second iron slag of the second blast furnace and detecting the temperature of the molten iron of the second blast furnace

130‧‧‧First judgment step

131‧‧‧Steps for inputting the second component of the second iron slag and the temperature of the molten iron into the first liquid permeable database

133‧‧‧Steps for detecting the temperature of the hearth of the second blast furnace

135‧‧‧Determination of the temperature of the hearth is equal to or less than the temperature of the molten iron

140‧‧‧Second modeling steps

141‧‧‧Steps for the second sampling process for the first coke

143‧‧‧A step of placing one of the first iron slag on each of the third cokes and detecting the penetration of the first iron slag on the third coke at the test temperature

145‧‧‧Steps for establishing a second liquid permeable database

150‧‧‧Second judgment step

151‧‧‧Steps for inputting the second component of the second iron slag and the temperature of the molten iron into the second liquid permeability database

153‧‧‧Steps for detecting the temperature of the hearth of the second blast furnace

155‧‧‧Steps to determine the temperature of the hearth is equal to or less than the temperature of the molten iron

For a more complete understanding of the embodiments of the invention and the advantages thereof, reference should be made to the description below and the accompanying drawings. It must be emphasized that the various features are not drawn to scale and are for illustrative purposes only. The related drawings are described as follows: [Fig. 1a] is a flow chart showing a method for evaluating the liquid permeability of the core of the furnace according to an embodiment of the present invention.

FIG. 1b is a flow chart showing a method for evaluating the liquid permeability of the core of the furnace according to another embodiment of the present invention.

The making and using of the embodiments of the invention are discussed in detail below. However, it will be appreciated that the embodiments provide many applicable inventive concepts that can be implemented in a wide variety of specific content. The specific embodiments discussed are illustrative only and are not intended to limit the scope of the invention.

The term "heart core" as used in the present invention refers to a coke stack stacked on a blast furnace hearth, wherein the coke stack is formed by a plurality of coke stacks, and the cokes have different particle sizes. Next, the term "iron slag" as used in the present invention means a mixture of molten iron and blast furnace slag to simulate the liquid permeability of molten iron and blast furnace slag in the blast furnace.

Please refer to FIG. 1a, which is a flow chart of a method for evaluating the liquid permeability of a furnace core according to an embodiment of the present invention. In this embodiment, method 100 first performs a first modeling step 110. Wherein, the first modeling step 110 first provides a first core of the first blast furnace comprising a plurality of first cokes, and performs a first sampling step and a screening step on the first cokes, thereby forming a plurality of Group second coke, as shown in step 111 and step 113. Wherein, the second coke obtained has a plurality of first particle diameters according to the size of the screen used in the sieving step.

Then, the sieved second coke is separately placed in a heat-resistant container (for example, a crucible), wherein the heat-resistant container has a corresponding number according to the number of classifications of the mesh size of the sieve. Next, a plurality of first iron slags of known composition are respectively placed on the second coke of each heat-resistant container, and the temperature is raised to a plurality of test temperatures, and each of the first iron slags is detected for each of the second cokes. The results are infiltrated to create a first liquid permeable database, as shown in steps 115 and 117.

In a specific example, in the foregoing step 115, one of the first iron slags is first placed on the second coke of each heat-resistant container. Then, the temperature is raised to the set test temperature. After a fixed test time, it was cooled, the second coke was peeled off, and it was observed whether the iron slag penetrated into the second coke. The foregoing first liquid permeable database can be established by repeating the foregoing steps until the first iron slag of each known component, and each test temperature, the test corresponding to each particle size of the second coke is completed. Accordingly, the first liquid permeable database records the liquid permeability of different iron slags composed of different sizes of coke, and the iron slag has different liquid permeability to coke depending on the test temperature.

In this specific example, those skilled in the art to which the present invention pertains can clearly understand that the first iron slag is to be infiltrated into the second coke, and the test temperature must be greater than or equal to the melting temperature of the first iron slag (ie, the flow temperature). The solid iron slag is formed into a liquid state and is permeable to the second coke. Among them, because of the first The composition of the iron slag is known, so that those skilled in the art to which the present invention pertains can clearly understand the melting temperature of the first iron slag, and can be used as a reference value for setting the aforementioned test temperature.

The first liquid permeable database comprises the first particle diameter of the second coke, the first component of the first iron slag and each test temperature, and an infiltration result corresponding to any combination of the parameters.

After performing the foregoing first modeling step 110, the second iron slag of the second blast furnace is provided, and the temperature of the molten iron of the second blast furnace is detected, as shown in step 120. In this step, the second blast furnace may be a blast furnace operating in the field, and the second iron slag may be an iron slag sample sampled through the blast nozzle or an iron slag sample discharged simultaneously with the molten iron. Wherein, when the second iron slag is taken out in the second blast furnace, the field operator can analyze the second component of the second iron slag by a conventional technique and method.

Next, a first determination step 130 is performed. The first determining step 130 first inputs the second component of the second iron slag and the molten iron temperature into the first liquid permeable database, as shown in step 131. Wherein, the second component corresponds to one of the first components in the first liquid permeability database, and the molten iron temperature corresponds to the test temperature in the first liquid permeability database.

Accordingly, when step 131 is performed, the input second component and the molten iron temperature may correspond to the critical coke particle diameter permeable to the second iron slag of the second component at the molten iron temperature. The term "critical coke particle size" as used herein refers to the critical particle size of the coke through which the second iron slag can pass at the temperature of the molten iron. Wherein, when the particle size of the coke is greater than or equal to the critical particle diameter, the second iron slag can pass the coke more easily due to the larger coke pores between the cokes; When the particle size of the coke is smaller than the critical particle diameter, since the cokes can be arranged densely, the coke pores are small, so that the second iron slag cannot be more permeable to coke.

After performing step 131, the temperature of the hearth of the second blast furnace is detected, and it is judged that the measured temperature of the hearth is equal to or lower than the temperature of the molten iron, as shown in steps 133 and 135. If the temperature of the hearth is equal to the temperature of the molten iron, the molten iron of the second blast furnace can pass through the second core, so the particle size of the coke of the second core is not less than the aforementioned critical coke particle size. If the temperature of the hearth is lower than the temperature of the molten iron, the molten iron of the second blast furnace cannot pass through the second core, so the particle size of the coke of the second core is smaller than the particle size of the aforementioned critical coke.

Accordingly, according to the relationship between the critical coke particle size obtained by inputting the second component of the second iron slag and the temperature of the molten iron to the first liquid permeability database, and the relationship between the hearth temperature and the temperature of the molten iron, the field operator can know The condition of the second core in the second blast furnace, and an appropriate improvement method can be adopted to promote the molten iron to pass through the second core, thereby improving the liquid permeability of the core, thereby prolonging the life of the blast furnace and enhancing the blast furnace refining Iron efficiency.

In a specific example, when the coke pores of the second core in the second blast furnace are not less than 3 mm, the molten iron of the second blast furnace can pass through the second core. In other words, when the particle size of the coke of the second core is greater than or equal to 3 mm, the molten iron of the second blast furnace can pass through the second core.

Please refer to FIG. 1a and FIG. 1b simultaneously, wherein FIG. 1b is a flow chart showing a method for evaluating the liquid permeability of the core of the furnace according to another embodiment of the present invention. In this embodiment, the process steps of the method 100b are substantially the same as the process steps of the method 100a, and the difference between the two is that the first judgment of FIG. 1a is performed. After step 130, the method 100b further includes performing a second modeling step 140 and a second determining step 150. The flow of the first modeling step 110 and the first determining step 130 of FIG. 1b are the same as the flow of the first modeling step 110 and the first determining step 130 of FIG. 1a, respectively, and therefore no further details are provided herein.

The second modeling step 140 is performed by performing a second sampling process on the first coke to obtain a plurality of third cokes, as shown in step 141. These third cokes each have a particle size distribution. Wherein, since the first furnace core is formed by coke of different particle diameters, the third coke obtained at each sampling position of the second sampling process has different particle size distributions according to different deposition behaviors. In the core of the conventional blast furnace, the farther the sampling position of the second sampling process is from the inner wall of the blast furnace (that is, the closer to the central axis of the blast furnace), the third coke obtained has more small-sized coke. Conversely, the closer the sampling position is to the inner wall of the blast furnace, the third coke obtained has more large-size coke.

Referring to FIG. 1b, after performing step 141, one of the first iron slags of the known composition is placed on each third coke obtained in the second sampling process, and the temperature is raised to a plurality of test temperatures, respectively. The permeation result of the first iron slag for each of the third cokes is detected to establish a second liquid permeability database, as shown in steps 143 and 145.

Similarly, in the foregoing step 143, the first iron slag is first placed on the third coke in each heat-resistant container. Then, the temperature is raised to the set test temperature. After a fixed test time, after cooling, the third coke was peeled off and the iron slag was observed to penetrate into the third coke. Repeat the previous steps until the first iron slag of this known component, and each test temperature The second liquid permeability database can be established by performing tests for each of the third cokes having different particle size distributions. Accordingly, the second liquid permeability database records the liquid permeability of the same iron slag composed of cokes of different particle size distributions, and depending on the test temperature, the iron slag has a liquid permeability to the cokes. Different.

The second liquid permeable database described above records the liquid permeability of an iron slag of a known composition for coke of different particle size distributions, and the iron slag has different liquid permeability to coke depending on the test temperature. .

After performing the aforementioned second modeling step 140, a second determining step 150 is performed. The second determining step 150 inputs the second component of the second iron slag and the temperature of the molten iron into the second liquid permeability database, as shown in step 151. Wherein, the second component corresponds to the first component of the second liquid permeability database, and the molten iron temperature corresponds to one of the test temperatures of the second liquid permeability database.

Accordingly, when step 151 is performed, the input second component and the molten iron temperature can be determined correspondingly to the molten iron temperature, and the second iron slag of the second component can transmit through one of the particle size distributions. The term "permeation particle size distribution" as used herein refers to the particle size distribution of the coke through which the second iron slag can pass at the temperature of the molten iron.

Among them, according to the foregoing, it can be seen that the farther away from the inner wall of the blast furnace, the furnace core has more small-sized coke. Furthermore, according to the "critical coke particle size" measured by the first determining step 130 (shown in FIG. 1a), the field operator can judge that if the particle size is smaller than the "critical coke" in the "permeation particle size distribution" There is too much coke in the particle size, and the molten iron in the second blast furnace will not easily pass through the second core.

After performing step 151, the temperature of the hearth of the second blast furnace is detected, and it is judged that the measured temperature of the hearth is equal to or lower than the temperature of the molten iron, as shown in steps 153 and 155. If the temperature of the hearth is equal to the temperature of the molten iron, the molten iron of the second blast furnace can pass through the second core. If the temperature of the hearth is less than the temperature of the molten iron, the molten iron of the second blast furnace cannot pass through the second core.

Therefore, based on the "critical coke particle size", "permeation particle size distribution" and "the penetration of the second blast furnace's molten iron through the second furnace core", the field operator can infer that in the second furnace core, the grain The content of coke (also referred to as coke fine powder) having a diameter smaller than the critical coke particle diameter is further known as the condition of the second grit.

In a specific example, based on the second core is 100%, when the content of the coke fine powder of the second core is less than 10%, the molten iron of the second blast furnace can pass through the second core. In this specific example, the particle size of the coke fine powder does not exceed 3.35 mm.

According to the foregoing description, the iron slag component of the second blast furnace (ie, the second component of the second iron slag) and the molten iron temperature are input into the liquid permeability database of the present case, and the furnace of the second blast furnace is judged. The relationship between the bed temperature and the temperature of the molten iron, the on-site operator can infer the liquid permeability of the second core of the second blast furnace, and can further judge whether appropriate improvement methods are adopted to promote the penetration of molten iron into the core, and enhance The liquid permeability of the second core, thereby extending the life of the blast furnace and improving the ironmaking efficiency.

The following examples are used to illustrate the application of the present invention, and are not intended to limit the present invention, and various modifications and refinements can be made without departing from the spirit and scope of the invention.

Preparation of the first liquid permeability database

The establishment of the first liquid permeability database is based on the first table, so please refer to the first table at the same time.

The furnace core screen taken out of the blast furnace is divided into eight grades, respectively, a portion having a coke particle size of less than 0.6 mm (hereinafter referred to as coke A), and a coke particle size system of greater than or equal to 0.6 mm and less than 1 mm. a fraction of PCT (hereinafter referred to as coke B), a coke particle size of greater than or equal to 1 mm and less than 1.4 mm (hereinafter referred to as coke C), and a coke particle size of greater than or equal to 1.4 mm and less than a portion of 1.7 mm (hereinafter referred to as coke D), a coke particle size of 1.7 mm or more and less than 3.35 mm (hereinafter referred to as coke E), and a coke particle size of 3.35 mm or more And a portion smaller than 6.7 mm (hereinafter referred to as coke F), a portion having a coke particle diameter of 6.7 mm or more and less than 10 mm (hereinafter referred to as coke G), and a coke particle size system greater than or equal to 10 parts (hereinafter referred to as coke H).

Then, the sieved cokes are separately placed in different crucibles, and the iron and four known blast furnace slags are respectively placed on the coke in the crucible at normal temperature. Among them, the flow temperature of the blast furnace slag A is 1344 ° C, the flow temperature of the blast furnace slag B is 1332 ° C, the flow temperature of the blast furnace slag C is 1328 ° C, and the flow temperature of the blast furnace slag D is 1320 ° C.

Next, the crucible is heated to the aforementioned flow temperature so that the solid iron or solid blast furnace slag can be melted and turned into a liquid state. After lowering the temperature, the coke was peeled off to determine whether solid iron or solid blast furnace slag was cooled and coagulated between the cokes and evaluated according to the following criteria:

◎: Iron or slag passes completely through the coke layer and flows completely to the bottom of the crucible.

○: Iron or slag can pass through the coke layer, but only part of the iron or slag flows to the bottom of the crucible.

△: Iron or slag passes only partially through the carbon layer, but cannot flow to the bottom of the crucible.

×: Iron or slag cannot pass through coke.

Effect of Surface Tension of Solid Iron and Solid Blast Furnace Slag on Liquid Permeability of Furnace

In order to investigate the influence of the surface tension between solid iron, solid blast furnace slag and coke on the liquid permeability of the furnace core, solid iron and blast furnace slag are placed in the above-mentioned coke F (the particle size after screening is greater than or equal to 3.35). It is on the inside and less than 6.7 mm, and neither the solid iron nor the blast furnace slag is in contact.

Then, it is heated to melt it. After condensation, both iron and slag did not pass through the coke. The iron and the blast furnace slag are combined into a spherical shape, and the interface between the two is horizontal. Accordingly, the surface tension between the iron and the slag is less than the surface tension between the iron and the coke, or the slag and the coke, and the iron and the slag have a better bond.

Effect of slag amount on liquid permeability of furnace core

The amount of the aforementioned blast furnace slag A was increased to 20 g and placed on the aforementioned coke F. After heating to melt, only a small portion of the blast furnace slag can pass through the coke (that is, 100% based on the blast furnace slag, only less than 30% of the blast furnace slag is passed through the coke), and the cooled blast furnace slag is flat. Therefore, the amount of slag does not affect the liquid permeability of the furnace core.

Establish a second liquid permeability database

The establishment of the second liquid permeability database is based on the second table. Therefore, please refer to the second table at the same time.

First, a second sampling step is performed on the core of the blast furnace, and the second sampling step samples the core according to the sampling position. Wherein, according to the distance between the sampling position and the inner wall of the blast furnace, the third coke obtained from the far (ie, near the central axis of the blast furnace) to the near (ie, near the inner wall of the blast furnace) is coke I, coke II and coke III, respectively. The coke is placed in a crucible. Due to the difference in sampling positions, the obtained coke I to coke III have different particle size distributions, as shown in Table 2.

In the second table, the particle size distribution of the coke includes a portion of greater than or equal to 50 mm (hereinafter referred to as particle diameter I), a portion of less than 50 mm and greater than or equal to 38 mm (hereinafter referred to as particle diameter) II), a portion of less than 38 mm and greater than or equal to 25 mm (hereinafter referred to as particle size III), a portion of less than 25 mm and greater than or equal to 15 mm (hereinafter referred to as particle size IV), and less than A portion of 15 mm or more and 3.35 mm or more (hereinafter referred to as particle diameter V) and a portion of less than 3.35 mm (hereinafter referred to as particle diameter VI), and other components represent substances such as fine coke particles.

According to the foregoing description, the liquid permeability of the solid iron and the solid blast furnace slag is similar, so the second liquid permeability database is established by using magnetic iron, and it is possible to determine whether iron has passed through the coke by magnetic properties.

Next, the solid iron is placed on the aforementioned coke I, coke II, and coke III, and heated to be melted to change the solid iron shape into liquid molten iron. After cooling, observe whether the molten iron penetrates the coke and evaluate it according to the following criteria:

○: Hot metal can penetrate coke and flow to the bottom of the crucible.

×: Hot metal cannot penetrate coke.

Therefore, according to the first table and the second table described above, the method for evaluating the liquid permeability of the furnace core can be effectively inferred, and an appropriate improvement method can be adopted to promote the penetration of molten iron in the blast furnace. The core of the furnace improves the liquid permeability of the furnace core, thereby prolonging the life of the blast furnace and improving the ironmaking efficiency.

Secondly, according to the method of the present invention, the field operator can measure the critical coke particle size and the transmission particle size distribution of the iron slag component at a specific temperature.

The present invention has been disclosed in the above embodiments, and is not intended to limit the present invention. Any one of ordinary skill in the art to which the present invention pertains can make various changes without departing from the spirit and scope of the invention. The scope of protection of the present invention is therefore defined by the scope of the appended claims.

100a‧‧‧ method

110‧‧‧First modeling step

111‧‧‧Steps to provide the first core of the first blast furnace

113‧‧‧The first sampling step for the first coke and the step of the screening step

115‧‧‧ Steps of placing the first iron slag on each of the second cokes and detecting the penetration of the first iron slag on the second coke at the test temperature

117‧‧‧Steps to establish a first liquid permeable database

120‧‧‧Providing the second iron slag of the second blast furnace and detecting the temperature of the molten iron of the second blast furnace

130‧‧‧First judgment step

131‧‧‧Steps for inputting the second component of the second iron slag and the temperature of the molten iron into the first liquid permeable database

133‧‧‧Steps for detecting the temperature of the hearth of the second blast furnace

135‧‧‧Determination of the temperature of the hearth is equal to or less than the temperature of the molten iron

Claims (4)

A method for assessing the liquid permeability of a furnace core, comprising: performing a first modeling step, wherein the first modeling step comprises: providing a first furnace core of a first blast furnace, wherein the first furnace core comprises a plurality of a first coke; performing a first sampling step on the first cokes and performing a sieving step to form a plurality of second cokes, wherein the second cokes respectively have a plurality of first particle sizes; A plurality of first iron slags are respectively disposed on each of the second cokes, and at each of the plurality of test temperatures, respectively, a result of infiltration of each of the first iron slags for each of the second cokes is detected. To establish a first liquid permeability database, wherein the first iron slags respectively have a first component, and the first liquid permeable database comprises the first particle diameters, the first components and the Testing the temperature, and corresponding to the permeation results; providing a second slag of a second blast furnace and analyzing a second component of the second slag; detecting a temperature of the molten iron of the second blast furnace; Performing a first determining step, wherein the first determining step package And inputting the second component and the molten iron temperature into the first liquid permeability database to determine that the second iron slag is permeable to a critical coke particle diameter at the molten iron temperature, wherein the second component pair Should be one of the first components, and the temperature of the molten iron corresponds to one of the test temperatures; Detecting a temperature of a hearth of the second blast furnace, if the temperature of the hearth is less than the temperature of the molten iron, one of the molten iron of the second blast furnace does not pass through the second core of the second blast furnace, and the second furnace One of the core particles is smaller than the critical coke particle diameter; and if the hearth temperature is equal to the molten iron temperature, one of the second blast furnaces can pass through the second furnace core, and the second furnace core is a grain The diameter is not less than the critical coke particle size. The method for evaluating the liquid permeability of a furnace core according to claim 1, wherein the molten iron of the second blast furnace passes through the first portion when the coke pores of the second furnace core are not less than 3 mm. Second furnace core, and the temperature of the hearth is equal to the temperature of the molten iron. The method for evaluating the liquid permeability of the core of the invention according to claim 1, wherein after performing the first determining step, the method further comprises: performing a second modeling step, wherein the second modeling step The method comprises: performing a second sampling process on the first cokes to obtain a plurality of third cokes, wherein the third cokes respectively have a particle size distribution; and placing one of the first iron slags And a plurality of third cokes, and at the test temperatures, respectively detecting the penetration results of the first iron slag for each of the third cokes to establish a second liquid permeability database Where the second liquid permeable database contains the a particle size distribution, the first component and the test temperatures, and the corresponding penetration results; and performing a second determining step, wherein the second determining step comprises: inputting the second component and the molten iron temperature Up to the second liquid permeable database, to determine that the second iron slag is permeable to a particle size distribution at the temperature of the molten iron, wherein the second component corresponds to the first component, and the temperature of the molten iron corresponds to And detecting the temperature of the hearth of the second blast furnace; if the temperature of the hearth is less than the temperature of the molten iron, the molten iron of the second blast furnace does not pass through the second core; When the temperature of the hearth is equal to the temperature of the molten iron, the molten iron of the second blast furnace can pass through the second core, and the second core has the permeability particle size distribution. The method for evaluating the liquid permeability of a furnace core according to claim 3, wherein when the content of one of the second furnace cores is less than 10%, based on the second core being 100% The molten iron of the second blast furnace may pass through the second core, and the temperature of the hearth is equal to the temperature of the molten iron, and one of the fine powders of the coke has a particle diameter smaller than the critical coke particle size.