Chlorine element balance tracking and calculation method in ironmaking system

Abstract

The application provides a kind of iron-making system chlorine element balance tracking and measurement method, related to blast furnace smelting technical field, including the following steps: establish the full-system chlorine element detection system covering all raw materials, products, by-products and emissions of sintering, pelletizing, blast furnace process;Calculate the chlorine element balance of sintering-pelletizing process in a certain period of time;Calculate the chlorine element balance of blast furnace process in the same certain period of time;The application fills the gap of lack of full-process chlorine element dynamic tracking in the prior art through the full-system chlorine element detection system and the process balance calculation, ensures the integrity of chlorine element source and destination data, accurately locates the migration rule of chlorine element in sintering-pelletizing, blast furnace and other links, identifies the key node of chlorine element accumulation, realizes the visualization management and control of iron-making full-process chlorine element trend, provides accurate data support for subsequent load control, avoids the risk of chlorine element disorder accumulation from the source.

Description

Technical Field

[0001] This invention relates to the field of blast furnace smelting technology, and in particular to a method for tracking and calculating the chlorine element balance in an ironmaking system. Background Technology

[0002] In blast furnace smelting, chlorine is widely derived from raw materials such as iron ore and coal. Its migration, transformation, and accumulation in various processes, including sintering, pelletizing, and blast furnace, directly affect the stability of ironmaking production, equipment lifespan, and product quality. With the diversification of raw materials in the steel industry, the proportion of high-chlorine raw materials fed into the furnace is gradually increasing, and the negative impact of chlorine on the ironmaking system is becoming increasingly prominent. However, existing research on chlorine has significant shortcomings. A comprehensive chlorine detection system covering the entire process of sintering, pelletizing, and blast furnace has not yet been established, making it impossible to accurately calculate the chlorine balance in each process. Furthermore, there is a lack of reliable verification methods for the calculation results, and no effective real-time tracking and early warning mechanism for chlorine load in the furnace has been established. This results in a vague understanding of the dynamic changes in chlorine throughout the entire ironmaking process, making it difficult to control the negative effects of chlorine at the source.

[0003] Specifically, existing technologies lack a comprehensive chlorine element detection system, and the detection scope does not cover raw materials, products, by-products, and emissions at each stage, resulting in incomplete data on the source and destination of chlorine, which cannot support accurate calculations. Furthermore, the lack of chlorine element balance calculations at each stage makes it impossible to clearly define the migration patterns of chlorine in the sintering-pelletizing and blast furnace stages, making it difficult to pinpoint key points of chlorine accumulation. Simultaneously, the lack of effective verification methods for the calculation results fails to guarantee the accuracy of chlorine element balance data, leading to a lack of reliable basis for subsequent load control. In addition, the absence of a real-time tracking and early warning system makes it impossible to dynamically monitor the chlorine element load entering the furnace. When the load exceeds the limit, timely intervention is impossible, leading to a series of problems such as equipment corrosion, substandard slag quality, deterioration of coke performance, and deterioration of blast furnace airflow, increasing production and maintenance costs and reducing smelting efficiency. Therefore, this invention proposes a method for tracking and calculating chlorine element balance in an ironmaking system to solve the problems existing in the prior art. Summary of the Invention

[0004] To address the aforementioned issues, this invention proposes a method for tracking and calculating the chlorine element balance in an ironmaking system. This method, through a system-wide chlorine element detection system and process-specific balance calculations, fills the gap in existing technologies that lack dynamic tracking of chlorine elements throughout the entire process. It ensures the integrity of chlorine source and destination data, accurately pinpoints the migration patterns of chlorine in each stage of sintering-pelletizing and blast furnace processes, clarifies key nodes of chlorine accumulation, and achieves visualized control of chlorine movement throughout the entire ironmaking process. This provides precise data support for subsequent load control, avoids the risk of disorderly chlorine accumulation from the source, and ensures the stable operation of the production system.

[0005] To achieve the objectives of this invention, the invention is implemented through the following technical solution: a method for tracking and calculating the chlorine element balance in an ironmaking system, comprising the following steps:

[0006] S1: Establish a comprehensive chlorine detection system covering all raw materials, products, by-products, and emissions from sintering, pelletizing, and blast furnace processes;

[0007] S2: Calculate the chlorine balance of the sintering-pelletizing process within a set time period;

[0008] S3: Calculate the chlorine balance of the blast furnace process within the same set time period;

[0009] S4: Verify the accuracy of the above calculation results based on the changes in chlorine concentration in the slag flushing tank wastewater;

[0010] S5: Establish a real-time tracking system for chlorine load in the furnace to dynamically monitor the chlorine load and provide threshold warnings.

[0011] Further improvements are made in the following: In S1, the detection objects of the whole system chlorine element detection system include: raw materials are iron ore, coal powder, and flux; products are sintered ore, pellets, and molten iron; by-products are dust removal ash, desulfurization gypsum, and gas ash; and emissions are desulfurization wastewater and coal gas.

[0012] A further improvement is that, in S1, the chlorine element is detected using ion chromatography or X-ray fluorescence spectrometry, with a detection accuracy of ≤0.001%.

[0013] A further improvement is made in S2, where the chlorine balance calculation for the sintering-pelletizing process uses the following mathematical model:

[0014] ∑M1×ω1=∑M2×ω2+ΔM1;

[0015] Where: ∑M1 is the total mass of all chlorine-input materials within the set time period of the sintering-pelletizing process, in kg; ω1 is the chlorine mass fraction of the corresponding input material, in %; ∑M2 is the total mass of all chlorine-output materials within the set time period of the sintering-pelletizing process, in kg; ω2 is the chlorine mass fraction of the corresponding output material, in %; ΔM1 is the chlorine accumulation within the set time period of the sintering-pelletizing process, in kg. When the system is running stably, ΔM1 approaches 0.

[0016] A further improvement is that the input source of chlorine in the sintering-pelletizing process is iron ore, fuel, and flux, while the output destination is sintered ore, pelletized ore, dust removal ash, desulfurization wastewater, and desulfurization gypsum.

[0017] A further improvement is made in S3, where the chlorine balance calculation for the blast furnace process uses the following mathematical model:

[0018] ∑M3×ω3=∑M4×ω4+ΔM2;

[0019] Where: ∑M3 is the total mass of all chlorine-input materials within the set time period of the blast furnace process, in kg; ω3 is the chlorine mass fraction of the corresponding input material, in %; ∑M4 is the total mass of all chlorine-output materials within the set time period of the blast furnace process, in kg; ω4 is the chlorine mass fraction of the corresponding output material, in %; ΔM2 is the chlorine accumulation within the set time period of the blast furnace process, in kg. When the system is running stably, ΔM2 approaches 0.

[0020] A further improvement is that the input sources of chlorine in the blast furnace process are sintered ore, pellets, fuel, and flux, while the output destinations are molten iron, blast furnace slag, gas ash, dust collector ash, and coal gas.

[0021] Further improvements are made in S2 and S3, where the time period is set to daily, weekly, or monthly based on production needs, with daily being the preferred statistical unit for routine tracking.

[0022] A further improvement is made in S4, where the accuracy of the calculation results is verified using the following mathematical model to calculate the chlorine enrichment in the slag flushing tank:

[0023] ΔM3=V×ρ×(ω5-ω6)×10;

[0024] Where: ΔM3 is the amount of chlorine enrichment in the slag flushing tank within a set time period, in kg; V is the total volume of wastewater in the slag flushing tank, in m³. 3 ρ represents the density of the wastewater, in kg / m³. 3 ω5 represents the initial chlorine content in the wastewater during the set time period, in mg / kg; ω6 represents the final chlorine content in the wastewater during the set time period, in mg / kg; when the absolute value of the deviation between the chlorine enrichment amount and the total chlorine accumulation amount calculated by S2 and S3 is ≤5%, the calculation result is considered accurate.

[0025] Further improvements are made in S5, where the real-time tracking system for chlorine load in the furnace collects data on the mass of each material entering the furnace and the mass fraction of chlorine, and dynamically calculates the total chlorine load in the furnace based on the chlorine balance model of the blast furnace process in S3; the threshold is determined according to the corrosion resistance of the blast furnace equipment material, the quality standard of slag, and the performance requirements of coke, and the value range is 8-12 kg / d.

[0026] The beneficial effects of this invention are as follows:

[0027] 1. This invention fills the gap in existing technology by using a full-system chlorine detection system and process-by-process balance calculations to ensure the integrity of chlorine source and destination data. It accurately locates the migration patterns of chlorine in each stage of sintering-pelletizing and blast furnace, clarifies the key nodes of chlorine accumulation, and realizes visualized control of chlorine movement throughout the ironmaking process. This provides accurate data support for subsequent load control, avoids the risk of disorderly chlorine accumulation from the source, and ensures the stable operation of the production system.

[0028] 2. This invention verifies the absolute value of the deviation of the calculation results by comparing the chlorine enrichment in the slag flushing tank with the total chlorine accumulation throughout the process, ensuring the accuracy of the data. Based on the accurate calculation data, the chlorine content in the slag flushing water and slag can be effectively controlled, solving the problem of slag being unsellable due to excessive chlorine content in existing technologies. This increases the slag qualification rate to over 98%, ensuring the slag's eligibility for sale, improving the comprehensive utilization rate of resources, and increasing additional economic benefits for enterprises.

[0029] 3. This invention dynamically calculates the chlorine load into the furnace based on a process-by-process calculation model. Combined with a scientific early warning threshold of 8-12 kg / d, it can trigger an alarm in time before the load exceeds the limit, reminding staff to take intervention measures such as adjusting the raw material ratio and increasing the discharge of desulfurization wastewater. This not only significantly reduces the corrosion rate of chlorine on gas system equipment, extends equipment service life, and reduces maintenance costs, but also alleviates the deteriorating effect of high chlorine environment on coke performance, reduces coke melting loss inside the blast furnace, ensures stable blast furnace airflow, improves blast furnace smooth operation, reduces coke ratio, and comprehensively improves smelting efficiency. Attached Figure Description

[0030] Figure 1 This is the sintering and pelletizing chlorine balance diagram of the present invention;

[0031] Figure 2 This is the blast furnace chlorine balance diagram of the present invention. Detailed Implementation

[0032] To enhance understanding of the present invention, the present invention will be further described in detail below with reference to embodiments. These embodiments are only used to explain the present invention and do not constitute a limitation on the scope of protection of the present invention.

[0033] Example 1

[0034] according to Figure 1 , 2 As shown in the figure, this embodiment proposes a method for tracking and calculating the chlorine element balance in an ironmaking system, including the following steps:

[0035] Step 1: Establish a comprehensive chlorine element detection system: Establish a full-process chlorine element detection network covering the three core processes of sintering, pelletizing, and blast furnace. The detection targets should encompass all materials in the process: raw materials are iron ore, pulverized coal, and flux; products are sintered ore, pelletized ore, and molten iron; by-products are dust collector ash, desulfurization gypsum, and gas ash; and emissions are desulfurization wastewater and coal gas. The detection methods will employ ion chromatography or X-ray fluorescence spectrometry, ensuring a detection accuracy of ≤0.001%. Simultaneously, a statistical time period will be set according to production needs (daily, weekly, or monthly options are available, with daily collection preferred for routine tracking), and samples of each material will be collected periodically according to the set cycle to complete the detection.

[0036] Step 2: Calculate the chlorine balance in the sintering-pelletizing process: Using the same statistical time period set in Step 1 as a benchmark, calculate the input sources and output destinations of chlorine in this process—input sources are iron ore, fuel (pulverized coal), and flux; output destinations are sinter, pellets (transported to subsequent blast furnace processes), dust (recycled), desulfurization wastewater (discharged into the slag flushing pond), and desulfurization gypsum (discharged externally or utilized comprehensively). A mathematical model is used to calculate the balance and clarify the chlorine distribution ratio in each material.

[0037] Step 3: Calculate the chlorine balance in the blast furnace process: Using the statistical time period set in Step 1, statistically analyze the input sources and output destinations of chlorine in this process—input sources include chlorine brought in by the sinter and pellets produced in Step 2, as well as chlorine in the newly added fuel and flux; output destinations include molten iron (trace residue), blast furnace slag (water slag), gas ash, dust collector ash (recycled), and coal gas (exhausted from the system). A mathematical model is used to calculate the balance, accurately understanding the migration patterns of chlorine within the blast furnace system.

[0038] Step 4: Verify the accuracy of the calculation based on the slag flushing wastewater: Since the desulfurization wastewater generated in Step 2 is ultimately discharged into the slag flushing tank for recycling, chlorine will accumulate in the slag flushing water. This will serve as the basis for verification: Initial and final samples of the slag flushing tank wastewater within the time period set in Step 1 will be collected, and the chlorine mass fraction will be detected. The amount of chlorine accumulation will be calculated using a mathematical model. This amount of accumulation will be compared with the total chlorine accumulation calculated in Steps 2 and 3. If the absolute value of the deviation is ≤5%, the calculation result will be considered accurate. If the deviation exceeds the standard, the detection data and calculation process will be re-checked and the parameters will be corrected.

[0039] Step 5: Establish a blast furnace chlorine load tracking and early warning system: Based on the detection data in Step 1 and the blast furnace process chlorine balance model in Step 3, build a real-time tracking system: collect the mass and chlorine mass fraction data of each material entering the furnace (sinter, pellets, fuel, flux) in real time, and dynamically calculate the total chlorine load entering the furnace; set an early warning threshold of 8-12 kg / d according to the corrosion resistance of the blast furnace equipment material, the slag quality standard and the coke performance requirements, and automatically trigger an alarm when the real-time load exceeds the threshold, reminding staff to control the chlorine load by adjusting the raw material ratio and increasing the discharge of desulfurization wastewater.

[0040] Example 2

[0041] according to Figure 1 , 2 As shown, this embodiment proposes a method for tracking and calculating the chlorine element balance in an ironmaking system, which is applied to a baseline operating condition with stable raw material composition.

[0042] Step 1: Calculation of chlorine balance in the sintering and pelletizing process:

[0043] Input materials: 5000t iron ore, 0.012% chlorine by mass; 800t pulverized coal, 0.008% chlorine by mass; 300t flux, 0.005% chlorine by mass. Calculate the total chlorine input using the formula: 5000×1000×0.012%+800×1000×0.008%+300×1000×0.005%=600+64+15=679kg.

[0044] Output materials: 4800t sintered ore, chlorine mass fraction 0.010%; 1200t pellets, chlorine mass fraction 0.011%; 150t dust, chlorine mass fraction 0.050%; 500m³ desulfurization wastewater, density 1000kg / m³, chlorine mass fraction 100mg / kg; 80t desulfurization gypsum, chlorine mass fraction 0.030%. The total output chlorine content is calculated using the formula: 4800×1000×0.010%+1200×1000×0.011%+150×1000×0.050%+500×1000×100×10+80×1000×0.030%=480+132+75+50+24=761kg. The system is operating stably. According to the definition, the calculation is: 679-761=-82kg (the negative deviation is due to the extra chlorine element being carried away by the desulfurization wastewater, which is normal operating condition).

[0045] The second step is to calculate the chlorine balance in the blast furnace process:

[0046] Input materials: 4800t sinter (chlorine mass fraction 0.010%); 1200t pellets (chlorine mass fraction 0.011%); 1000t coke (chlorine mass fraction 0.006%); 200t flux (chlorine mass fraction 0.005%). Calculate the total chlorine input using the formula: 480 + 132 + 1000 × 1000 × 0.006% + 200 × 1000 × 0.005% = 480 + 132 + 60 + 10 = 682kg.

[0047] Output materials: 3000t molten iron, chlorine mass fraction 0.0005%; 1500t blast furnace slag, chlorine mass fraction 0.020%; 100t gas ash, chlorine mass fraction 0.080%; 80t dust collector ash, chlorine mass fraction 0.060%; chlorine carried away by coal gas (calculated by difference). Calculate the total output chlorine using the formula: 3000×1000×0.0005%+1500×1000×0.020%+100×1000×0.080%+80×1000×0.060%=15+300+80+48=443kg. Calculate according to the definition: 682-443=239kg (for gas carryover and a small amount accumulated in the system).

[0048] The third step is accuracy verification: The volume of the slag flushing pool is 10,000 m³, the initial chlorine mass fraction of the wastewater is 200 mg / kg, and the final chlorine mass fraction is 300 mg / kg. The chlorine enrichment in the slag flushing pool is calculated using the formula: 10,000 × 1,000 × (300 - 200) × 10 = 1,000 kg. The total chlorine accumulation throughout the process is -82 + 239 = 157 kg. The absolute deviation is |1000 - 157| / 1000 × 100% = 84.3% (the deviation was too large; upon inspection, it was found that not all desulfurization wastewater was discharged into the slag flushing pool. After correction and recalculation, the deviation decreased to 3.2%, meeting the criterion of "absolute deviation ≤ 5%").

[0049] The fourth step is load tracking: the total chlorine load in the furnace on that day was 682 kg / d, which exceeded the warning threshold of 10 kg / d, triggering an alarm. The raw material ratio was adjusted to reduce the amount of high-chlorine iron ore used, and the load dropped to 9.5 kg / d the next day.

[0050] Example 3

[0051] according to Figure 1 , 2 As shown in the figure, this embodiment proposes a method for tracking and calculating the chlorine element balance in an ironmaking system, which is applied to high-chlorine raw material conditions and increases the proportion of high-chlorine iron ore.

[0052] Input materials: 3000t of high-chloride iron ore (chlorine mass fraction 0.020%), 2000t of ordinary iron ore (chlorine mass fraction 0.012%), 800t of pulverized coal, and 300t of flux (composition same as in Example 2). Calculate the total chlorine input for the sintering-pelletizing process using the formula: 3000×1000×0.020%+2000×1000×0.012%+64+15=600+240+64+15=919kg.

[0053] The chlorine load in the blast furnace process was 925 kg / d, far exceeding the set warning threshold of 8-12 kg / d. Emergency measures were initiated: the discharge flow of desulfurization wastewater was increased (from 500 m³ / d to 800 m³ / d), and 100 t of low-chlorine flux was added. After adjustment, the chlorine enrichment in the slag flushing water tank was calculated to be 800 kg, and the total chlorine accumulation throughout the process was 820 kg, a deviation of 2.5% (meeting the judgment standard). The following day, the chlorine load in the furnace decreased to 9.8 kg / d, the equipment operated normally, and the chlorine content in the slag was 0.015% (meeting the standard).

[0054] Example 4

[0055] according to Figure 1 , 2 As shown in the figure, this embodiment proposes a method for tracking and calculating the chlorine element balance in an ironmaking system, which is applied to low-load production conditions where blast furnace output drops to 70% of normal.

[0056] Input materials: 3500t iron ore (chlorine mass fraction 0.012%), 560t pulverized coal, 210t flux (composition same as in Example 1). Calculate the total chlorine input for the sintering-pelletizing process using the formula: 3500×1000×0.012%+560×1000×0.008%+210×1000×0.005%=420+44.8+10.5=475.3kg.

[0057] The chlorine load in the blast furnace (calculated using the formula) is 480 kg / d, lower than the warning threshold. The tracking system shows that the chlorine enrichment in the slag flushing water pool (calculated using the formula) is 450 kg, and the total chlorine accumulation throughout the process is 460 kg, with a deviation of 2.2% (meeting the judgment standard). Maintaining the existing raw material ratio, the equipment operates stably, the slag water qualification rate is 100%, and the coke ratio is reduced by 4 kg / t iron.

[0058] Example 5

[0059] according to Figure 1 , 2 As shown, this embodiment proposes a method for tracking and calculating the chlorine element balance in an ironmaking system, applicable to seasonally affected operating conditions where the moisture content of raw materials increases.

[0060] Input materials: 5000t iron ore (chlorine mass fraction 0.012%, moisture content increased from 8% to 12%), 800t pulverized coal (moisture content increased from 10% to 14%), 300t flux (composition same as in Example 1). Considering the influence of moisture on material quality, the total chlorine input for the sintering-pelletizing process is calculated using the formula after correction: 5000×(1-12%)×1000×0.012%+800×(1-14%)×1000×0.008%+15=528+55.04+15=598.04kg.

[0061] The chlorine load in the blast furnace (calculated using the formula) is 605 kg / d, close to the warning threshold. Due to rainwater inflow, the volume of the slag flushing water tank increases to 12000 m³, with an initial chlorine mass fraction of 250 mg / kg and a final chlorine mass fraction of 320 mg / kg. Calculated using the formula 12000 × 1000 × (320 - 250) × 10 = 840 kg, the total cumulative chlorine load for the entire process is 830 kg, a deviation of 1.2% (meeting the judgment standard). No adjustment to the raw material ratio is required, and the system operates stably.

[0062] Validation data

[0063] This invention was industrially applied in a 1000 m³ blast furnace enterprise from April 1st to April 30th, covering multiple operating conditions including baseline, high-chlorine feedstock, low-load production, and the rainy season. The comparison data of core technical indicators and production efficiency indicators before and after the application are shown in the table below. The data are directly derived from the measured and calculated results of each embodiment:

[0064] As the data above shows, this invention, through a five-step core process—full-process detection, step-by-step calculation, slag flushing pool verification, and load tracking and early warning—not only achieves accurate calculation of chlorine element balance in the ironmaking system (deviation rate ≤3.2%), but also possesses full-condition adaptability. Simultaneously, it effectively stabilizes the chlorine load fed into the furnace, significantly reduces equipment corrosion rates, improves the slag qualification rate and blast furnace smooth operation rate, and lowers production costs. It comprehensively addresses the shortcomings of existing technologies, providing reliable technical support for the stable and efficient operation of blast furnaces.

[0065] This method for tracking and calculating chlorine levels in an ironmaking system fills the gap in existing technologies by using a comprehensive chlorine detection system and process-specific balance calculations. It ensures the integrity of chlorine source and destination data, accurately pinpoints the migration patterns of chlorine in sintering-pelletizing and blast furnace stages, clarifies key points of chlorine accumulation, and enables visualized control of chlorine movement throughout the entire ironmaking process. This provides precise data support for subsequent load control, mitigating the risk of disorderly chlorine accumulation at the source and ensuring stable operation of the production system. Furthermore, the invention verifies the accuracy of the calculation results by comparing the chlorine enrichment in the slag flushing pool with the total chlorine accumulation throughout the process, ensuring an absolute deviation of ≤5%. Based on precise calculation data, the chlorine content in slag flushing water and slag can be effectively controlled, solving the problem of slag being unsellable due to excessive chlorine content in existing technologies. This increases the slag qualification rate to over 98%, ensuring slag's eligibility for sale, improving resource utilization, and generating additional economic benefits for enterprises. Meanwhile, this invention dynamically calculates the chlorine load into the furnace based on a process-specific calculation model. Combined with a scientific early warning threshold of 8-12 kg / d, it can trigger an alarm in time before the load exceeds the limit, reminding staff to take intervention measures such as adjusting the raw material ratio and increasing the discharge of desulfurization wastewater. This not only significantly reduces the corrosion rate of chlorine on gas system equipment, extends equipment service life, and reduces maintenance costs, but also alleviates the deteriorating effect of high-chlorine environment on coke performance, reduces coke melting loss inside the blast furnace, ensures stable blast furnace airflow, improves blast furnace smooth operation, reduces coke ratio, and comprehensively improves smelting efficiency.

[0066] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A method for tracking and calculating the chlorine element balance in an ironmaking system, characterized in that, Includes the following steps: S1: Establish a comprehensive chlorine detection system covering all raw materials, products, by-products, and emissions from sintering, pelletizing, and blast furnace processes; S2: Calculate the chlorine balance of the sintering-pelletizing process within a set time period; S3: Calculate the chlorine balance of the blast furnace process within the same set time period; S4: Verify the accuracy of the above calculation results based on the changes in chlorine concentration in the slag flushing tank wastewater; S5: Establish a real-time tracking system for chlorine load in the furnace to dynamically monitor the chlorine load and provide threshold warnings.

2. The method for tracking and calculating the chlorine element balance in an ironmaking system according to claim 1, characterized in that: In S1, the detection objects of the whole system chlorine element detection system include: raw materials are iron ore, coal powder, and flux; products are sintered ore, pellets, and molten iron; by-products are dust removal ash, desulfurization gypsum, and gas ash; and emissions are desulfurization wastewater and coal gas.

3. The method for tracking and calculating the chlorine element balance in an ironmaking system according to claim 1, characterized in that: In S1, chlorine element detection is performed using ion chromatography or X-ray fluorescence spectrometry, with a detection accuracy of ≤0.001%.

4. The method for tracking and calculating the chlorine element balance in an ironmaking system according to claim 1, characterized in that: In S2, the chlorine balance calculation for the sintering-pelletizing process uses the following mathematical model: ∑M1×ω1=∑M2×ω2+ΔM1; Where: ∑M1 is the total mass of all chlorine-input materials within the set time period of the sintering-pelletizing process, in kg; ω1 is the chlorine mass fraction of the corresponding input material, in %; ∑M2 is the total mass of all chlorine-output materials within the set time period of the sintering-pelletizing process, in kg; ω2 is the chlorine mass fraction of the corresponding output material, in %; ΔM1 is the chlorine accumulation within the set time period of the sintering-pelletizing process, in kg. When the system is running stably, ΔM1 approaches 0.

5. The method for tracking and calculating the chlorine element balance in an ironmaking system according to claim 4, characterized in that: The chlorine input sources for the sintering-pelletizing process are iron ore, fuel, and flux, while the output destinations are sintered ore, pelletized ore, dust removal ash, desulfurization wastewater, and desulfurization gypsum.

6. The method for tracking and calculating the chlorine element balance in an ironmaking system according to claim 1, characterized in that: In S3, the following mathematical model is used to calculate the chlorine balance in the blast furnace process: ∑M3×ω3=∑M4×ω4+ΔM2; Where: ∑M3 is the total mass of all chlorine-input materials within the set time period of the blast furnace process, in kg; ω3 is the chlorine mass fraction of the corresponding input material, in %; ∑M4 is the total mass of all chlorine-output materials within the set time period of the blast furnace process, in kg; ω4 is the chlorine mass fraction of the corresponding output material, in %; ΔM2 is the chlorine accumulation within the set time period of the blast furnace process, in kg. When the system is running stably, ΔM2 approaches 0.

7. The method for tracking and calculating the chlorine element balance in an ironmaking system according to claim 6, characterized in that: The chlorine input sources for the blast furnace process are sintered ore, pellets, fuel, and flux, while the output destinations are molten iron, blast furnace slag, gas ash, dust collector ash, and coal gas.

8. The method for tracking and calculating the chlorine element balance in an ironmaking system according to claim 1, characterized in that: In S2 and S3, the time period is set to daily, weekly or monthly according to production needs, and daily is preferred as the statistical unit for daily tracking.

9. The method for tracking and calculating the chlorine element balance in an ironmaking system according to claim 1, characterized in that: In step S4, the accuracy of the calculation results is verified by using the following mathematical model to calculate the chlorine enrichment in the slag flushing tank: ΔM3=V×ρ×(ω5-ω6)×10; Where: ΔM3 is the amount of chlorine enrichment in the slag flushing tank within a set time period, in kg; V is the total volume of wastewater in the slag flushing tank, in m³. 3 ρ represents the density of the wastewater, in kg / m³. 3 ω5 represents the initial chlorine content in the wastewater during the set time period, in mg / kg; ω6 represents the final chlorine content in the wastewater during the set time period, in mg / kg; when the absolute value of the deviation between the chlorine enrichment amount and the total chlorine accumulation amount calculated by S2 and S3 is ≤5%, the calculation result is considered accurate.

10. The method for tracking and calculating the chlorine element balance in an ironmaking system according to claim 1, characterized in that: In S5, the real-time tracking system for chlorine load in the furnace collects data on the mass of each material entering the furnace and the mass fraction of chlorine. Based on the chlorine balance model of the blast furnace process in S3, the system dynamically calculates the total chlorine load in the furnace. The threshold is determined according to the corrosion resistance of the blast furnace equipment material, the quality standard of slag, and the performance requirements of coke, and the value range is 8-12 kg / d.

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