Method for quantitatively judging activity of blast furnace hearth
By measuring and calculating the physical calorific value and other real-time parameters of the blast furnace furnace cylinder, the furnace activity index is calculated, and the problem of poor evaluation accuracy in the existing technology is solved, efficient and practical furnace activity judgment is achieved, and the blast furnace is optimized. Operation and production efficiency.
Patent Information
- Application Number
- CN202411310310.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-19
- Publication Date
- 2024-12-20
AI Technical Summary
The existing technology lacks simple and accurate quantitative measurement standards to judge the activity of blast furnace furnace cylinders, resulting in poor evaluation accuracy, complex calculations and special equipment required to be invested, which affects ironmaking production efficiency and molten iron quality.
By measuring and calculating the maximum physical calorific value, silicon iron content, rheumatism, hot air temperature, air volume, oxygen enrichment and blowing rate of iron in front of the blast furnace, the furnace cylinder activity index is calculated, divided into high, medium and low Three levels, providing scientific reference.
Improve evaluation accuracy and operability, monitor and predict furnace cylinder status in real time, optimize operating parameters, reduce fuel consumption, and extend blast furnace life.
Smart Images
Figure CN119166944A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the field of blast furnace use, and in particular to a method for quantitatively judging the activity of a blast furnace hearth. Background Art
[0002] Blast furnace smelting is a key process in steel production. The activity of the blast furnace hearth is directly related to the smooth operation of the blast furnace, fuel consumption and molten iron quality. Good hearth activity, even furnace operation and more abundant furnace heat can promote the reduction and melting of ore and improve the production efficiency of ironmaking. At the same time, good hearth activity, strong heat storage capacity and relatively high gas utilization rate are conducive to reducing fuel consumption and achieving the goal of energy saving and consumption reduction. In addition, the activity of the hearth is also directly related to the quality of molten iron. Inactive hearth may cause large fluctuations in molten iron temperature and pig iron silicon content, increased sulfur content and other problems, affecting the subsequent steelmaking process.
[0003] At present, there is no simple and accurate quantitative measurement standard for the activity of the furnace. It is mainly reflected indirectly through some indicators and parameters, such as furnace temperature, slag fluidity, molten iron temperature, number of tapping times, single furnace tapping amount, etc. Because these parameters are affected by many factors, judging the activity of the furnace from a single parameter is unreliable; or it requires the use of special equipment and the method of taking coke from the tuyere, because it requires the use of special equipment and takes up some of the wind-down time; or it is obtained through complex calculations of many production parameters, which is difficult to calculate and difficult to assess in accuracy. Summary of the invention
[0004] The purpose of the present invention is to provide a method for quantitatively judging the activity of a blast furnace hearth, which can quantitatively express the degree of hearth activity and convert the hearth activity into a specific numerical value. At the same time, the calculation is relatively simple and the data is reliable, so as to provide a more scientific reference basis for blast furnace operators and managers more quickly.
[0005] To solve the above problems, the technical solution adopted by the present invention is as follows: The present invention is a method for quantitatively judging the activity of a blast furnace hearth, comprising the following steps: Step 1, parameter selection: obtain the highest physical calorific value measured for each furnace of iron tapping in front of the blast furnace and the average silicon content of molten iron in each furnace; Step 2, data processing: The data in step 1 are all taken as the average value of one day; Step 3: Calculate the index that characterizes the corresponding relationship between the silicon content of molten iron and the physical heat of molten iron, the blast furnace physical heat index, which is calculated as follows: Kt_p = [(tp-1400) / 100]^2 / [Si]; Step 4: Calculate the theoretical combustion temperature. The calculation method is: Tf=1488-4.6HB+0.725TB+56.3167(O2 / VB)-21816.67(COAL / VB); Step 5: Calculate the furnace activity index: furnace activity index = Kt_p-(Tf-2000)^2 / 10^5; Step six, divide the furnace activity level by comparison interval.
[0006] Furthermore, in step 1, the blast furnace real-time parameters such as blast humidity, hot air temperature, air volume, oxygen enrichment and injection rate need to be measured.
[0007] Furthermore, the furnace activity index in step six is divided into three levels: high, medium and low according to the actual furnace conditions. If the furnace activity is at a low level for several consecutive days, blast furnace operators and managers need to pay attention and actively take effective measures to improve this situation.
[0008] Preferably, t_p is the physical heat of molten iron, °C; [Si] is the silicon content of molten iron, %.
[0009] Preferably, HB is the blast moisture content, g / m³; TB is the wind temperature, °C; O2 is the oxygen enrichment, m³ / h; COAL is the injection rate, t / h; VB is the air volume, m³ / min.
[0010] The beneficial effects achieved by the present invention using the above structure are as follows: 1. Improve the accuracy of assessment: By eliminating the influence of blast humidity, coal injection amount, wind temperature, oxygen enrichment and other factors, the accuracy of the physical thermal index in judging the activity of the hearth is improved, and the correlation between the calculated hearth activity index and the blast furnace core temperature is significantly improved.
[0011] 2. Improve the operability, practicality and timeliness of judging the activity of the furnace. The calculation of this method is relatively simple and can quickly give a judgment on the activity trend of the furnace.
[0012] 3. Real-time monitoring and prediction: This method can monitor the operating status of the blast furnace hearth in real time and has a certain predictive function for future activity, providing a guarantee for the stable operation of the blast furnace.
[0013] 4. Operation optimization guidance: The evaluation results can guide blast furnace operators to optimize the operating parameters to improve production efficiency, reduce fuel consumption and increase blast furnace life. BRIEF DESCRIPTION OF THE DRAWINGS
[0014] Figure 1 A flow chart of a method for quantitatively judging the activity of a blast furnace hearth proposed by the present invention; Figure 2The invention discloses a method for quantitatively judging the activity of a blast furnace hearth, which is a hearth activity index. DETAILED DESCRIPTION
[0015] As the instruction manual Figure 1~Figure 2 As shown, the present invention is a method for quantitatively judging the activity of a blast furnace hearth.
[0016] Raw material management: Understanding the relationship between furnace activity and raw material quality can provide a basis for the selection and management of raw materials. For example, choosing a more suitable coke to maintain good air and liquid permeability in the furnace.
[0017] Blast furnace design and improvement: During the blast furnace design phase, the hearth activity index data of similar blast furnaces can be referenced to optimize the hearth structure and related parameters to improve the hearth activity of the newly built blast furnace. For existing blast furnaces, analysis can also be performed based on operating data to provide direction for the transformation and upgrade of the hearth.
[0018] Process parameter optimization research: Using the hearth activity index and other related parameters, we can conduct research on process parameter optimization. For example, we can analyze the changing rules of the hearth activity index under different operating conditions, find the optimal combination of process parameters, and achieve efficient production of the blast furnace. Example
[0019] A method for quantitatively judging the activity of a blast furnace hearth comprises the following steps: Step 1: Taking the production parameters of a 2800m³ blast furnace of a steel enterprise during operation on July 3, 2024, the sensors are used to collect the average value of the highest physical calorific value of 1508℃ measured in each furnace of the blast furnace, the average silicon content of 0.29% in the molten iron of each furnace, and the real-time parameters of the blast furnace, such as the blast moisture content of 27g / m³, the hot air temperature of 1200℃, the air volume of 5885m³ / min, the oxygen enrichment of 35017 m³ / h, and the injection rate of 72t / h. Step 2: Calculate the average value; Step 3, calculate the physical thermal index: [(1508-1400) / 100]^2 / 0.29=4.022; Step 4: Calculate the theoretical combustion temperature: 1488-4.6*27+0.725*1200+56.3167*(35017 / 5885)-21816.67*(72 / 5885)=2302; Step 5: Calculate the furnace activity index: 4.022-(2302-2000)^2 / 100000=3.11; Similarly, the daily furnace activity index since 2023 is calculated to obtain a set of data, and its trend changes are as follows: Figure 2 ; The correlation analysis of this set of data with the furnace core temperature, the furnace core temperature after 15 days, and the furnace core temperature after 30 days was performed respectively. The correlation was about 0.3 higher than the correlation between the physical thermal index and the furnace core temperature, the furnace core temperature after 15 days, and the furnace core temperature after 30 days, reaching a moderate or strong correlation. Step 6: The furnace hearth activity index <2 is considered as low furnace hearth activity, the furnace hearth activity index <3 but >2 is considered as medium furnace hearth activity, and the furnace hearth activity index >3 is considered as high furnace hearth activity. It can be seen from the figure that the furnace hearth activity has a downward trend in August 2023, and the furnace hearth activity of the blast furnace is poor from November 2023 to January 2024. Compared with the actual blast furnace production, there are indeed phenomena such as shrinking air volume, difficult to control edge airflow, reduced furnace core temperature, and output.
[0020] If the activity of the furnace hearth is evaluated early and the operating parameters of the blast furnace are optimized and adjusted according to the results, such as adjusting the air volume, coal injection amount, or adjusting the charge ratio, coke quality, cooling water flow, etc., to maintain stable operation of the furnace hearth, the blast furnace will be able to maintain stable and smooth operation for a long time.
[0021] It should be understood that although this specification is described according to implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.
Claims
1. A method for quantitatively determining the activity of a blast furnace hearth, characterized in that: The steps include: Step 1, parameter selection: obtain the highest physical calorific value measured for each furnace of iron tapping in front of the blast furnace and the average silicon content of molten iron in each furnace; Step 2, data processing: The data in step 1 are all taken as the average value of one day; Step 3: Calculate the index that characterizes the corresponding relationship between the silicon content of molten iron and the physical heat of molten iron, the blast furnace physical heat index, which is calculated as follows: Kt_p = [(tp-1400) / 100]^2 / [Si]; Step 4: Calculate the theoretical combustion temperature. The calculation method is: Tf=1488-4.6HB+0.725TB+56.3167(O2 / VB)-21816.67(COAL / VB); Step 5: Calculate the furnace activity index: furnace activity index = Kt_p-(Tf-2000)^2 / 10^5; Step six, divide the furnace activity level by comparison interval.
2. A method for quantitatively determining the activity of a blast furnace hearth according to claim 1, characterized in that: In the step 1, the blast furnace real-time parameters including blast humidity, hot air temperature, air volume, oxygen enrichment and injection rate need to be measured.
3. A method for quantitatively determining the activity of a blast furnace hearth according to claim 1, characterized in that: In step six, the furnace hearth activity index is divided into three levels: high, medium and low according to the actual furnace conditions. If the furnace hearth activity is at a low level for several consecutive days, blast furnace operators and managers need to pay attention and actively take effective measures to improve this situation.