Calculation Method of Reactivity and Post-Reaction Strength of Alkali-Rich Coke in High-Titanium Blast Furnace

Abstract

The present invention discloses a method for calculating the reactivity and post-reaction strength of alkali-rich coke in a high-titanium blast furnace, and belongs to the technical field of metallurgical production technology. A method for quickly calculating the reactivity and post-reaction strength of alkali-rich coke in a blast furnace is provided, so as to achieve a simple and efficient calculation method for determining the performance index of coke in the blast furnace. The calculation method first uses the prepared alkali-rich coke as a sample to measure the coke reactivity CRI and post-reaction strength CSR of the alkali-rich coke through actual testing, and defines the relationship between the target alkali metal concentration in the blast furnace and the coke performance through regression analysis based on the alkali metal concentration obtained during the preparation of the alkali-rich coke, and obtains CRI=f(C K ,C Na ) Formula 1, CSR = f(C K ,C Na ) Formula 2, then, collect the current potassium income, sodium income, daily molten iron production and daily coke consumption of the target blast furnace, and calculate the vapor concentration C of alkali metals K and Na formed in the blast furnace K with C Na Finally, the alkali metal concentration data C K with C Na Substituting into formulas 1 and 2, the reactivity CRI and post-reaction strength CSR of alkali-rich coke in the blast furnace are calculated.

Description

Technical Field

[0001] The present invention relates to a calculation method, in particular to a calculation method for the reactivity and post-reaction strength of alkali-rich coke in a high-titanium blast furnace, and belongs to the technical field of metallurgical production technology. Background Art

[0002] Blast furnaces are currently the most efficient process equipment for reducing iron oxides and the primary producer of raw materials for the steelmaking process. Problems during production can delay and disrupt the entire production process. The coke used in blast furnace ironmaking not only serves as a reducing and exothermic agent but also as the skeleton of the charge column. To achieve optimal technical and economic performance in blast furnace operation, the smelting coke, commonly known as metallurgical coke, must possess appropriate chemical and physical properties, including thermal properties during the smelting process. However, due to the high temperature, high pressure, enclosed, complex, and harsh environment within the blast furnace during actual production, real-time monitoring of the metallurgical process is difficult. Therefore, early detection of changes in the quality of blast furnace coke after alkali enrichment and the implementation of timely adjustments are crucial for the stable and smooth operation of the blast furnace. However, current research on the quality changes of blast furnace coke after alkali enrichment is limited, both domestically and internationally, and lacks practical application. At the same time, due to the presence of TiC, TiN, and Ti(C,N), slag and iron separation in high-titanium blast furnaces is more difficult than in ordinary blast furnaces and is more affected by abnormal furnace conditions. Currently, there are few calculation methods for the quality changes of alkali-rich coke in high-titanium blast furnaces. Therefore, developing a calculation method for the reactivity and post-reaction strength of alkali-rich coke in high-titanium blast furnaces has become a technical problem that technical personnel in this field urgently need to solve. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide a method for calculating the reactivity and post-reaction strength of alkali-rich coke in a high-titanium blast furnace, which can quickly calculate the reactivity and post-reaction strength of alkali-rich coke in the blast furnace and achieve simple and efficient determination of the performance indicators of coke in the blast furnace.

[0004] The technical solution adopted to solve the above technical problems is: a method for calculating the reactivity and post-reaction strength of alkali-rich coke in a high-titanium blast furnace, characterized in that: the calculation method first uses the prepared alkali-rich coke as a sample to measure the coke reactivity CRI and post-reaction strength CSR of the alkali-rich coke through actual testing, and combines the alkali metal concentration obtained during the preparation of the alkali-rich coke through regression analysis to define the relationship between the target alkali metal concentration in the blast furnace and the coke performance, and obtains the following relationship:

[0005] CRI=f(C K ,C Na )……………………(1),

[0006] CSR=f(C K ,C Na)……………………(2),

[0007] Where, CRI and CSR represent the coke reactivity and post-reaction strength, respectively, %; C K with C Na Represent the potassium vapor concentration and sodium vapor concentration, %,

[0008] Then, collect the current potassium income, sodium income, and daily molten iron output M of the target blast furnace. Fe And the daily coke consumption M C Calculate the vapor concentration C of alkali metals K and Na formed in the blast furnace K with C Na ,

[0009] Finally, the calculated alkali metal concentration data C in the current blast furnace is K with C Na Substituting into formulas (1) and (2), the reactivity CRI and post-reaction strength CSR of alkali-rich coke in the blast furnace are calculated.

[0010] The correction coefficients of regression equations (1) and (2) are greater than 90%.

[0011] Furthermore, the alkali-rich coke is prepared by a high-temperature gas-phase adsorption method. The high-temperature gas-phase adsorption method is an experimental method for preparing alkali-rich coke by fumigating coke with a certain alkali metal vapor at a high temperature, simulating a blast furnace environment. The specific experimental process is to use a vertical resistance furnace, in an inert atmosphere at a high temperature of 1300°C, to generate a certain concentration of potassium or sodium vapor by a reduction reaction between anhydrous potassium carbonate or anhydrous sodium carbonate and carbon powder. The potassium or sodium vapor is used to fumigate a certain amount of coke balls for at least 1 hour to obtain potassium-rich coke or sodium-rich coke.

[0012] The particle size of the coke balls is 23 to 25 mm.

[0013] A preferred embodiment of the above scheme is that the coke reactivity and post-reaction strength measurement experiments are conducted in accordance with the national standard GB / T4000-2017, and the number of tests is not less than 3 times.

[0014] Furthermore, when calculating the current steam concentration C of alkali metals K and Na in the target blast furnace, K with C Na It is calculated according to the following formula:

[0015]

[0016] Where M Fe is the daily output of molten iron, t; MC is the daily consumption of coke, kg; M K-re 、M Na-reRespectively represent the circulating enrichment of K and Na in the furnace, kg / t.

[0017] The preferred embodiment of the above scheme is that the circulating enrichment of alkali metals K and Na in the furnace is calculated according to the following formula:

[0018] M K-re =R K ×N K-re ;M Na-re =R Na ×N Na-re ;

[0019] Where N K-re 、N Na-re Respectively represent the cyclic enrichment multiples of alkali metals K and Na in the target blast furnace, generally ranging from 1 to 50; R K 、R Na Respectively represent the alkali metal K and Na furnace load, kg / t.

[0020] Furthermore, the cyclic enrichment multiples of alkali metals K and Na in the target blast furnace are based on the initial cyclic enrichment multiples N. K-re-o 、N Na-re-o Based on the data of the latest income and expenditure of alkali metals in the blast furnace, the enrichment multiple value is updated iteratively every month. The calculation formula is as follows:

[0021]

[0022] Where R K-in-new 、R Na-in-new Respectively represent the daily income of alkali metals K and Na from the blast furnace, kg / t; R K-out-new 、R Na-out-new Respectively represent the daily expenditure of alkali metals K and Na in the blast furnace, kg / t; Respectively represent the average value of the blast furnace alkali metal K and Na income in the newly collected time period, kg / t,

[0023] And in the first run, let the cycle enrichment multiple N K-re =N K-re-o , N Na-re＝ N Na-re-o .

[0024] The preferred method of the above scheme is that after the calculation of the circulation enrichment multiples of alkali metals K and Na in the target blast furnace is completed, the circulation enrichment multiple N K-re 、N Na-re Make reasonable judgment, the specific requirements are N K-re ≥1, N Na-re ≥1, otherwise select the N calculated last time K-re、N Na-re Data for the vapor concentration C of alkali metals K and Na K with C Na Calculation; or based on experience, directly specify N K-re 、N Na-re Numerical analysis of the vapor concentration C of alkali metals K and Na K with C Na The specified value is usually between 1 and 50.

[0025] Furthermore, the initial cycle enrichment factor N K-re-o 、N Na-re-o It is calculated based on the daily income and expenditure data of alkali metals K and Na monitored for at least one month after the start-up of the target blast furnace, and then calculated according to the following formula:

[0026]

[0027] Where: R K-in 、R Na-in Respectively represent the daily alkali metal K and Na intake of the blast furnace, kg / t; R K-out 、R Na-out Respectively represent the daily expenditure of alkali metals K and Na in the blast furnace, kg / t; They represent the average value of the alkali metal K and Na intake in the blast furnace over a period of time, kg / t.

[0028] The beneficial effect of the present invention is that the calculation method provided by the present application first uses the prepared alkali-rich coke as a sample to measure the coke reactivity CRI and the post-reaction strength CSR of the alkali-rich coke through actual testing, and combines the alkali metal concentration obtained in the preparation process of the alkali-rich coke to define the relationship between the target alkali metal concentration in the blast furnace and the coke performance through regression analysis, and obtains the following relationship: CRI = f(C K ,C Na ) is marked as formula (1), CSR=f(C K ,C Na ) is marked as formula (2), and then the current potassium income, sodium income, and daily molten iron output M of the target blast furnace are collected. Fe And the daily coke consumption M C Calculate the vapor concentration C of alkali metals K and Na formed in the blast furnace K with C Na Finally, the calculated alkali metal concentration data C in the current blast furnace is K with C NaSubstituting these into formulas (1) and (2), the reactivity CRI and post-reaction strength CSR of alkali-rich coke in the blast furnace are calculated, and the correction coefficients of regression equations (1) and (2) are greater than 90%. Since the calculation method provided by the present application first determines the coke reactivity CRI and post-reaction strength CSR of alkali-rich coke through experiments and derives the calculation formula, and then collects the corresponding parameters in real time to calculate the reactivity CRI and post-reaction strength CSR of alkali-rich coke in the blast furnace, it not only solves the technical problem of the lack of a reference calculation method in the prior art, but also uses the above calculation formula provided by the present application to quickly calculate the reactivity and post-reaction strength of alkali-rich coke in the blast furnace, thereby achieving a simple and efficient determination of the performance indicators of coke in the blast furnace. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 This is a decision logic diagram of the method for calculating the reactivity and post-reaction strength of alkali-rich coke in a high-titanium blast furnace according to the present invention. DETAILED DESCRIPTION

[0030] like Figure 1 The present invention provides a method for calculating the reactivity and post-reaction strength of alkali-rich coke in a high-titanium blast furnace, which can quickly calculate the reactivity and post-reaction strength of alkali-rich coke in the blast furnace, thereby achieving a simple and efficient determination of the performance indicators of coke in the blast furnace. The calculation method first uses the prepared alkali-rich coke as a sample to measure the coke reactivity CRI and post-reaction strength CSR of the alkali-rich coke through actual testing, and then defines the relationship between the target alkali metal concentration in the blast furnace and the coke performance through regression analysis based on the alkali metal concentration obtained during the preparation of the alkali-rich coke, and obtains the following relationship:

[0031] CRI=f(C K ,C Na )……………………(1),

[0032] CSR=f(C K ,C Na )……………………(2),

[0033] Where, CRI and CSR represent the coke reactivity and post-reaction strength, respectively, %; C K with C Na Represent the potassium vapor concentration and sodium vapor concentration, %,

[0034] Then, collect the current potassium income, sodium income, and daily molten iron output M of the target blast furnace. Fe And the daily coke consumption M C Calculate the vapor concentration C of alkali metals K and Na formed in the blast furnace K with C Na ,

[0035] Finally, the calculated alkali metal concentration data C in the current blast furnace is K with C Na Substituting into formulas (1) and (2), the reactivity CRI and post-reaction strength CSR of alkali-rich coke in the blast furnace are calculated.

[0036] The correction coefficients of regression equations (1) and (2) are greater than 90%. The calculation method provided in this application first uses the prepared alkali-rich coke as a sample to measure the coke reactivity CRI and the post-reaction strength CSR of the alkali-rich coke through actual testing, and combines the alkali metal concentration obtained during the preparation of the alkali-rich coke to define the relationship between the target alkali metal concentration in the blast furnace and the coke performance through regression analysis, and obtains the following relationship: CRI = f(C K ,C Na ) is marked as formula (1), CSR=f(C K ,C Na ) is marked as formula (2), and then the current potassium income, sodium income, and daily molten iron output M of the target blast furnace are collected. Fe And the daily coke consumption M C Calculate the vapor concentration C of alkali metals K and Na formed in the blast furnace K with C Na Finally, the calculated alkali metal concentration data C in the current blast furnace is K with C Na Substituting these into formulas (1) and (2), the reactivity CRI and post-reaction strength CSR of alkali-rich coke in the blast furnace are calculated, and the correction coefficients of regression equations (1) and (2) are greater than 90%. Since the calculation method provided by the present application first determines the coke reactivity CRI and post-reaction strength CSR of alkali-rich coke through experiments and derives the calculation formula, and then collects the corresponding parameters in real time to calculate the reactivity CRI and post-reaction strength CSR of alkali-rich coke in the blast furnace, it not only solves the technical problem of the lack of a reference calculation method in the prior art, but also uses the above calculation formula provided by the present application to quickly calculate the reactivity and post-reaction strength of alkali-rich coke in the blast furnace, thereby achieving a simple and efficient determination of the performance indicators of coke in the blast furnace.

[0037] In the above embodiment, the speed of calculation and the accuracy of calculation are improved. In the preparation of alkali-rich coke, the present application adopts a high-temperature gas phase adsorption method. The high-temperature gas phase adsorption method is an experimental method for preparing alkali-rich coke by fumigating coke with a certain alkali metal vapor at a high temperature in a simulated blast furnace environment. The specific experimental process is to use a vertical resistance furnace, in an inert atmosphere at a high temperature of 1300 ° C, to generate a certain concentration of potassium or sodium vapor by a reduction reaction between anhydrous potassium carbonate or anhydrous sodium carbonate and carbon powder. The vapor is used to fumigate a certain amount of coke balls for at least 1 hour to obtain potassium-rich coke or sodium-rich coke, wherein the particle size of the coke balls is 23 to 25 mm. Accordingly, when conducting the coke reactivity and post-reaction strength measurement experiments, the national standard GB / T4000-2017 is used, and the number of tests is not less than 3 times.

[0038] Accordingly, in order to facilitate the calculation process, the present application calculates the current steam concentration C of alkali metals K and Na in the target blast furnace. K with C Na It is calculated according to the following formula:

[0039]

[0040] Where M Fe is the daily output of molten iron, t; M C is the daily coke consumption, kg; M K-re 、M Na-re Respectively represent the circulating enrichment of K and Na in the furnace, kg / t. At this time, the circulating enrichment of alkali metals K and Na in the furnace is calculated according to the following formula:

[0041] M K-re =R K ×N K-re ;M Na-re =R Na ×N Na-re ;

[0042] Where N K-re 、N Na-re Respectively represent the cyclic enrichment multiples of alkali metals K and Na in the target blast furnace, generally ranging from 1 to 50; R K 、R Na Respectively represent the alkali metal K and Na furnace load, kg / t;

[0043] The cyclic enrichment multiples of alkali metals K and Na in the target blast furnace are based on the initial cyclic enrichment multiple N K-re-o 、N Na-re-o Based on the data of the latest income and expenditure of alkali metals in the blast furnace, the enrichment multiple value is updated iteratively every month. The calculation formula is as follows:

[0044]

[0045] Where R K-in-new 、R Na-in-new Respectively represent the daily income of alkali metals K and Na from the blast furnace, kg / t; R K-out-new 、R Na-out-new Respectively represent the daily expenditure of alkali metals K and Na in the blast furnace, kg / t; Respectively represent the average value of the blast furnace alkali metal K and Na income in the newly collected time period, kg / t,

[0046] And in the first run, let the cycle enrichment multiple N K-re =N K-re-o , N Na-re =N Na-re-o At the same time, after the calculation of the circulation enrichment multiples of alkali metals K and Na in the target blast furnace is completed, the circulation enrichment multiple N K-re 、N Na-re Make reasonable judgment, the specific requirements are N K-re ≥1, N Na-re ≥1, otherwise select the N calculated last time K-re 、N Na-re Data for the vapor concentration C of alkali metals K and Na K with C Na Calculation; or based on experience, directly specify N K-re 、N Na-re Numerical analysis of the vapor concentration C of alkali metals K and Na K with C Na The specified value is usually between 1 and 50.

[0047] Furthermore, the initial cycle enrichment multiple N of this application is K-re-o 、N Na-re-o It is calculated based on the daily income and expenditure data of alkali metals K and Na monitored for at least one month after the start-up of the target blast furnace, and then calculated according to the following formula:

[0048]

[0049] Where: R K-in 、R Na-in Respectively represent the daily alkali metal K and Na intake of the blast furnace, kg / t; R K-out 、R Na-out Respectively represent the daily expenditure of alkali metals K and Na in the blast furnace, kg / t; They represent the average value of the alkali metal K and Na intake in the blast furnace over a period of time, kg / t.

[0050] The regression analysis described in this application is an existing traditional regression method; the correction coefficient of determination described in this application is mainly used to judge the degree of fit between the regression equation and the actual data. It is often used in regression analysis. Its essence is the goodness of fit, also known as the adjusted R 2 .

[0051] In summary, the technical solution provided by this application establishes a new calculation method that can use the alkali load data and other production data in the blast furnace to more accurately calculate the reactivity and post-reaction strength of the alkali-rich coke in the blast furnace through simple calculations, so as to assist on-site operators in judging the furnace condition. It is simple, efficient, practical, and applicable to high-titanium blast furnaces. It can be extended to other ordinary smelting blast furnaces and high-titanium smelting blast furnaces, and has great application value. By monitoring the alkali metal load of the blast furnace, the performance of the coke in the furnace can be quickly calculated. It is simple, easy to operate, and practical. It helps blast furnace on-site operators to directly calculate the reactivity and post-reaction strength of the coke inside the blast furnace by monitoring the alkali metal load data of the blast furnace. At the same time, it is beneficial to promptly discover abnormal coke performance so as to take necessary measures to stabilize the furnace condition and reduce unnecessary fluctuations and accidents. Specific embodiments

[0053] The purpose of the present invention is to provide a method for calculating the reactivity and post-reaction strength of alkali-rich coke in the blast furnace. The calculation method can quickly calculate the reactivity and post-reaction strength of alkali-rich coke in the blast furnace based on the studied blast furnace alkali metal load data, thereby achieving the purpose of simply and efficiently determining the performance indicators of coke in the blast furnace.

[0054] Technical solution:

[0055] To achieve the above objectives, the present invention calculates the reactivity and post-reaction strength of blast furnace alkali-rich coke through the following steps:

[0056] Step 1: Define the relationship between target blast furnace alkali metal concentration and coke properties

[0057] The original coke sample of the target blast furnace was taken and alkali-rich coke was prepared by high temperature gas phase adsorption method. Then, the coke reactivity and post-reaction strength test were carried out according to the national standard GB / T4000-2017. The data of each experiment were recorded, including the alkali metal concentration (potassium vapor concentration C K and sodium vapor concentration C Na ), coke reactivity CRI and post-reaction strength CSR measurement results.

[0058] Among them, the high-temperature gas-phase adsorption method refers to an experimental method that simulates the blast furnace environment and uses a certain amount of alkali metal vapor to fumigate coke at high temperature to prepare alkali-rich coke. The specific experimental process is: using a vertical resistance furnace, in an inert atmosphere at a high temperature of 1300°C, anhydrous potassium carbonate (or anhydrous sodium carbonate) and carbon powder undergo a reduction reaction to generate a certain concentration of potassium (or sodium) vapor, which is used to fumigate a certain amount of coke balls (particle size 23-25mm) for 1 hour, thereby preparing potassium (or sodium)-rich coke to provide samples for subsequent reactivity and post-reaction strength measurements.

[0059] According to the different alkali metal vapor concentrations (C K with C Na ) data and the corresponding coke performance (CRI and CSR) data, and a regression analysis is performed to define the relationship between the target blast furnace alkali metal concentration and coke performance. The relationship shown below is obtained, and the adjusted coefficient of determination (Adjusted R Square) of the regression equation is required to be greater than 90%.

[0060] CRI=f(C K ,C Na ) (1)

[0061] CSR=f(C K ,C Na ) (2)

[0062] Where: CRI and CSR represent the coke reactivity and post-reaction strength respectively, %; C K with C Na Represent the potassium vapor concentration and sodium vapor concentration, %.

[0063] Step 2: Define the alkali metal enrichment multiples in the target blast furnace

[0064] Based on the daily income of alkali metal K and Na (R K-in With R Na-in ) and expenditure data (R K-out With R Na-out ), and then calculate the initial cycle enrichment multiples N of alkali metals K and Na respectively according to the following formula K-re-o With N Na-re-o :

[0065]

[0066]

[0067] Where: N K-re-o 、N Na-re-o Respectively represent the initial cycle enrichment multiples of alkali metals K and Na in the target blast furnace; RK-in 、R Na-in Respectively represent the daily alkali metal K and Na intake of the blast furnace, kg / t; R K-out 、R Na-out Respectively represent the daily expenditure of alkali metals K and Na in the blast furnace, kg / t; They represent the average value of the alkali metal K and Na intake in the blast furnace over a period of time, kg / t.

[0068] The next step is to continue to collect new data on blast furnace alkali metal income and expenditure, and iteratively update the cycle enrichment multiple value every month. The calculation formula is as follows:

[0069]

[0070]

[0071] Where: N K-re 、N Na-re Respectively represent the cyclic enrichment multiples of alkali metals K and Na in the target blast furnace; R K-in-new 、R Na-in-new Respectively represent the daily income of alkali metals K and Na from the blast furnace, kg / t; R K-out-new 、R Na-out-new Respectively represent the daily expenditure of alkali metals K and Na in the blast furnace, kg / t; They represent the average income of blast furnace alkali metals K and Na in the newly collected time period, kg / t.

[0072] When the calculation method is run for the first time, the cycle enrichment factor N K-re =N K-re-o , N Na-re＝ N Na-re-o .

[0073] If the target blast furnace cannot collect relevant data for cycle enrichment multiple calculation or the amount of data is insufficient to complete the calculation, the cycle enrichment multiple data (N K-re 、N Na-re ) is substituted into this calculation, or the blast furnace operator directly specifies the specific value of the cycle enrichment multiple (N) according to the target blast furnace smelting conditions. K-re 、N Na-re ) is used for subsequent calculations and is generally set between 1 and 50.

[0074] Then judge the calculation result N K-re 、N Na-re The rationality of N K-re ≥1 and N Na-re ≥1, otherwise select the N calculated last time K-re 、N Na-reThe data is used for this calculation, or according to experience, directly specify N K-re 、N Na-re Numeric value, usually ranging from 1 to 50.

[0075] Step 3: Calculate the alkali metal circulation enrichment in the blast furnace and the alkali metal vapor concentration in the furnace

[0076] Collect the current blast furnace's alkali metal K and Na charge load R K With R Na (i.e., income), daily molten iron output M Fe and daily coke consumption M C First, calculate the circulating enrichment amount M of alkali metals K and Na in the blast furnace K-re With M Na-re , the calculation formula is as follows:

[0077] M K-re =R K ×N K-re (7)

[0078] M Na-re =R Na ×N Na-re (8)

[0079] Where: M K-re 、M Na-re Respectively represent the circulating enrichment of K and Na in the furnace, kg / t; R K 、R Na They represent the furnace load (i.e., intake) of alkali metals K and Na, kg / t respectively.

[0080] Then calculate the concentration C of alkali metal K and Na vapor formed in the blast furnace K with C Na , the calculation formula is as follows:

[0081]

[0082]

[0083] Where: M Fe is the daily output of molten iron, t; M C is the daily coke consumption, kg.

[0084] Step 4: Calculate coke reactivity and post-reaction strength

[0085] The alkali metal concentration data C in the current blast furnace calculated in step 3 is K with C Na , substituted into formulas (1) and (2) to calculate the reactivity CRI and post-reaction strength CSR of alkali-rich coke in the blast furnace.

[0086] Example 1

[0087] In order to make the above features and advantages of the present invention more obvious and easy to understand, Figure 1 The decision logic diagram takes the actual production data of a steel company's blast furnace as an example to further explain the present invention in detail:

[0088] Figure 1 This is the decision logic diagram of the invention.

[0089] Step 1: Define the relationship between target blast furnace alkali metal concentration and coke properties

[0090] The original coke sample of the target blast furnace was taken and alkali-rich coke was prepared by high temperature gas phase adsorption method. Then, the coke reactivity and post-reaction strength test were carried out according to the national standard GB / T4000-2017. The data of each experiment were recorded, including the alkali metal concentration (potassium vapor concentration C K and sodium vapor concentration C Na ), the coke reactivity CRI and post-reaction strength CSR measurement results are shown in Table 1.

[0091] Among them, the high-temperature gas-phase adsorption method refers to an experimental method that simulates the blast furnace environment and uses a certain amount of alkali metal vapor to fumigate coke at high temperature to prepare alkali-rich coke. The specific experimental process is: using a vertical resistance furnace, in an inert atmosphere at a high temperature of 1300°C, anhydrous potassium carbonate (or anhydrous sodium carbonate) and carbon powder undergo a reduction reaction to generate a certain concentration of potassium (or sodium) vapor, which is used to fumigate a certain amount of coke balls (particle size 23-25mm) for 1 hour, thereby preparing potassium (or sodium)-rich coke to provide samples for subsequent reactivity and post-reaction strength measurements.

[0092] According to the different alkali metal vapor concentrations (C K with C Na ) data and the corresponding coke performance (CRI and CSR) data, a regression analysis was performed to define the relationship between the target blast furnace alkali metal concentration and coke performance. The relationship shown below was obtained, and the adjusted determination coefficients (Adjusted R Square) of the regression equations were 97% and 92%, respectively, both greater than 90%, meeting the requirements.

[0093] CRI=a+b×C K +c×C Na (1)

[0094] CSR=i+j×C K +k×C Na (2)

[0095] Where: CRI and CSR represent the coke reactivity and post-reaction strength respectively, %; C K with CNa represent the potassium vapor concentration and the sodium vapor concentration, respectively, %; a, b, c and i, j, k are constants, which are 25.156, 7.160, 13.924, 63.129, -7.218, -15.393, respectively.

[0096] Table 1 Test results of coke reactivity and post-reaction strength at different alkali metal vapor concentrations

[0097] Serial number K(％) Na(%) CRI (%) CSR (%) 1 0.00 0.00 24.44 65.08 2 0.50 0.25 31.35 58.19 3 1.00 0.25 36.75 50.2 4 2.00 0.25 42.60 45.47 5 0.20 0.50 34.42 50.57 6 0.20 1.00 41.12 45.28 7 0.20 2.00 53.95 32.1

[0098] Step 2: Define the alkali metal enrichment multiples in the target blast furnace

[0099] Based on the daily income of alkali metal K and Na in the first month after the blast furnace is opened (R K-in With R Na-in ) and expenditure data (R K-out With R Na-out ), and then calculate the initial cycle enrichment multiples N of alkali metals K and Na respectively according to the following formula K-re-o With N Na-re-o , calculate N K-re-o =10.3, N Na-re-o =8.5:

[0100]

[0101]

[0102] Where: N K-re-o 、N Na-re-o Respectively represent the initial cycle enrichment multiples of alkali metals K and Na in the target blast furnace; R K-in 、R Na-in Respectively represent the daily alkali metal K and Na intake of the blast furnace, kg / t; R K-out 、R Na-out Respectively represent the daily expenditure of alkali metals K and Na in the blast furnace, kg / t; They represent the average value of the alkali metal K and Na intake in the blast furnace over a period of time, kg / t.

[0103] When the calculation method is run for the first time, the cycle enrichment factor N K-re =N K-re-o =4.1, N Na-re＝ N Na-re-o =3.0, due to N K-re ≥1 and N Na-re ≥1, then the calculation result is N K-re 、N Na-re Reasonable and can be used for calculation.

[0104] Step 3: Calculate the alkali metal circulation enrichment in the blast furnace and the alkali metal vapor concentration in the furnace

[0105] Collect the current blast furnace's alkali metal K and Na charge load R K With R Na (i.e., income), daily molten iron output M Fe and daily coke consumption M C First, calculate the circulating enrichment amount M of alkali metals K and Na in the blast furnace K-re With M Na-re , the calculation formula is as follows:

[0106] M K-re =R K ×N K-re (5)

[0107] M Na-re =R Na ×N Na-re (6)

[0108] Where: M K-re 、M Na-re Respectively represent the circulating enrichment of K and Na in the furnace, kg / t; R K 、R Na They represent the furnace load (i.e., intake) of alkali metals K and Na, kg / t respectively.

[0109] Then calculate the concentration C of alkali metal K and Na vapor formed in the blast furnace K with C Na , the calculation formula is as follows:

[0110]

[0111]

[0112] Where: M Fe is the daily output of molten iron, t; M C is the daily coke consumption, kg.

[0113] Substitute into R respectively K With R Na The values ​​are 2.792kg / t and 2.980kg / t, and the daily output of molten iron is M Fe =3202.9t and daily coke consumption M C =1.5×10 6 kg data into formulas (5), (6), (7) and (8) to calculate the alkali metal K and Na vapor concentration C K =2.44%, C Na =1.91%.

[0114] Step 4: Calculate coke reactivity and post-reaction strength

[0115] The alkali metal concentration data C in the current blast furnace calculated in step 3 is K =2.44%, C Na =1.91%, and substituted into formulas (1) and (2) to calculate the reactivity CRI and post-reaction strength CSR of the alkali-rich coke in the blast furnace, which are CRI=69.22% and CSR=16.12 respectively. These can be used to judge the level of increase in the reactivity of the coke after alkali enrichment and the degree of decrease in the post-reaction strength of the coke in the blast furnace, and to judge the furnace condition by comprehensively analyzing the data of various aspects of the blast furnace.

Claims

1. A method for calculating the reactivity and post-reaction strength of alkali-rich coke in a high-titanium blast furnace, characterized by: The calculation method first uses the prepared alkali-rich coke as a sample to measure the coke reactivity CRI and the post-reaction strength CSR of the alkali-rich coke through actual testing, and then uses the alkali metal concentration obtained during the preparation of the alkali-rich coke to define the relationship between the target alkali metal concentration in the blast furnace and the coke performance through regression analysis, and obtains the following relationship: CRI=f(C K ,C Na )……………………(1), CSR=f(C K ,C Na )……………………(2), Where, CRI and CSR represent the coke reactivity and post-reaction strength, respectively, %; C K with C Na Represent the potassium vapor concentration and sodium vapor concentration, %, Then, collect the current potassium income, sodium income, and daily molten iron output M of the target blast furnace. Fe And the daily coke consumption M C Calculate the vapor concentration C of alkali metals K and Na formed in the blast furnace K with C Na , Finally, the calculated alkali metal concentration data C in the current blast furnace is K with C Na Substituting into formulas (1) and (2), the reactivity CRI and post-reaction strength CSR of alkali-rich coke in the blast furnace are calculated. The correction coefficients of regression equations (1) and (2) are greater than 90%. When calculating the current steam concentration C of alkali metals K and Na in the target blast furnace K with C Na It is calculated according to the following formula: Where M Fe is the daily output of molten iron, t; M C is the daily coke consumption, kg; M K-re 、M Na-re Respectively represent the circulating enrichment of K and Na in the furnace, kg / t, The circulating enrichment of alkali metals K and Na in the furnace is calculated according to the following formula: M K-re =R K ×N K-re ;M Na-re =R Na ×N Na-re ; Where N K-re 、N Na-re Respectively represent the cyclic enrichment multiples of alkali metal K and Na in the target blast furnace, ranging from 1 to 50; R K 、R Na Respectively represent the alkali metal K and Na furnace load, kg / t, The cyclic enrichment multiples of alkali metals K and Na in the target blast furnace are based on the initial cyclic enrichment multiple N K-re-o 、N Na-re-o Based on the data of the latest income and expenditure of alkali metals in the blast furnace, the enrichment multiple value is updated iteratively every month. The calculation formula is as follows: Where R K-in-new 、R Na-in-new Respectively represent the daily income of alkali metals K and Na from the blast furnace, kg / t; R K-out-new 、R Na-out-new Respectively represent the daily expenditure of alkali metals K and Na in the blast furnace, kg / t; Respectively represent the average value of the blast furnace alkali metal K and Na income in the newly collected time period, kg / t, And in the first run, let the cycle enrichment multiple N K-re =N K-re-o , N Na-re＝ N Na-re-o .

2. The method for calculating the reactivity and post-reaction strength of alkali-rich coke in a high-titanium blast furnace according to claim 1, characterized in that: The alkali-rich coke is prepared by a high-temperature gas-phase adsorption method. The high-temperature gas-phase adsorption method is an experimental method for preparing alkali-rich coke by fumigating coke with a specified alkali metal vapor at a high temperature in a simulated blast furnace environment. The specific experimental process is to use a vertical resistance furnace, in an inert atmosphere at a high temperature of 1300°C, to generate potassium or sodium vapor of a specified concentration by a reduction reaction between anhydrous potassium carbonate or anhydrous sodium carbonate and carbon powder. The potassium or sodium vapor is then used to fumigate a specified amount of coke balls for at least one hour to obtain potassium-rich coke or sodium-rich coke. The particle size of the coke balls is 23 to 25 mm.

3. The method for calculating the reactivity and post-reaction strength of alkali-rich coke in a high-titanium blast furnace according to claim 2, characterized in that: The national standard GB / T4000-2017 is used as the basis for the coke reactivity and post-reaction strength test, and the number of tests is not less than 3 times.

4. The method for calculating the reactivity and post-reaction strength of alkali-rich coke in a high-titanium blast furnace according to claim 1, 2 or 3, characterized in that: After the calculation of the circulation enrichment multiples of alkali metals K and Na in the target blast furnace is completed, the circulation enrichment multiple N K-re 、N Na-re Make reasonable judgment, the specific requirements are N K-re ≥1, N Na-re ≥1, otherwise select the N calculated last time K-re 、N Na-re Data for the vapor concentration C of alkali metals K and Na K with C Na Calculation; or based on experience, directly specify N K-re 、N Na-re Numerical analysis of the vapor concentration C of alkali metals K and Na K with C Na The specified value ranges from 1 to 50.

5. The method for calculating the reactivity and post-reaction strength of alkali-rich coke in a high-titanium blast furnace according to claim 4, characterized in that: Initial cycle enrichment factor N K-re-o 、N Na-re-o It is calculated based on the daily income and expenditure data of alkali metals K and Na monitored for at least one month after the start-up of the target blast furnace, and then calculated according to the following formula: Where: R K-in 、R Na-in Respectively represent the daily alkali metal K and Na intake of the blast furnace, kg / t; R K-out 、R Na-out Respectively represent the daily expenditure of alkali metals K and Na in the blast furnace, kg / t; They represent the average value of the alkali metal K and Na intake in the blast furnace over a period of time, kg / t.

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