CN116732262A - Method and system for regulating and controlling blast furnace smelting - Google Patents

Abstract

The embodiment of the invention discloses a method and a system for regulating and controlling blast furnace smelting, wherein the method comprises the steps of calculating a theoretical value of a molten iron mass component according to a corresponding relation between raw materials and slag components produced by a blast furnace; wherein the molten iron mass components comprise molten iron silicon content and molten iron sulfur content; based on the content deviation between the actual value and the theoretical value of the molten iron mass component, the ratio of the material quantity parameters is adjusted by combining the molten iron temperature index; the material quantity parameters at least comprise sinter, ball ore and coke, and are formed by proportioning raw materials; and correcting the proportion of the raw materials according to the adjusted material quantity parameters. According to the scheme, the data are utilized to correlate the blast furnace smelting process, the data are quantitatively regulated in the smelting process, the fluctuation of furnace conditions caused by human intervention can be reduced, the long-period stable and smooth running of the blast furnace is facilitated, the quality index of molten iron of the blast furnace is stabilized, and powerful support is provided for smelting high-quality steel.

Description

A control method and system for blast furnace smelting

Technical field

Embodiments of the present invention relate to the technical field of blast furnace smelting, and in particular to a control method and system for blast furnace smelting.

Background technique

The blast furnace smelting process includes multiple processes and requires a variety of raw materials. The composition and quality of raw materials are important indicators of blast furnace smelting.

There are many types of raw materials used in blast furnace smelting. The composition of raw materials fluctuates greatly and the quality fluctuates frequently, which affects the stability of blast furnace smelting. As a result, the hot metal index of the smelted product fluctuates greatly, affecting the quality of steel. Under the current technical conditions, it is necessary to rely on operators to dynamically adjust a large number of process parameters in real time to narrow the production fluctuation range. It is a single department and a single major that solves technical problems in production according to their professional characteristics. There is no whole-process digital correlation. This is A major technical problem faced by enterprises.

Contents of the invention

Embodiments of the present invention provide a control method and system for blast furnace smelting to solve the problem of digital correlation control in the blast furnace smelting process.

According to one aspect of the present invention, a control method for blast furnace smelting is provided, including:

According to the corresponding relationship between the raw materials and the slag components produced by the blast furnace, the theoretical value of the molten iron quality component is calculated; wherein the molten iron quality component includes the silicon content of the molten iron and the sulfur content of the molten iron;

Based on the content deviation between the actual value and the theoretical value of the molten iron quality component, combined with the molten iron temperature indicator, the proportion of the material quantity parameter is adjusted; wherein the material quantity parameter at least includes sinter, pellet ore and coke, The material quantity parameter is formed by the raw material ore blending;

The proportion of the raw materials is corrected according to the adjusted material quantity parameters.

Optionally, based on the content deviation between the actual value and the theoretical value of the molten iron quality component, combined with the molten iron temperature indicator, the step of adjusting the proportion of the material quantity parameter includes:

According to the demand for smelting steel types, establish a molten iron quality composition interval standard and a molten iron temperature control interval standard; wherein, the molten iron quality composition interval standard includes a molten iron silicon content interval standard and a molten iron sulfur content interval standard;

Taking the molten iron temperature control interval standard as a benchmark target, the proportion of the material quantity parameter is adjusted according to the actual value of the molten iron quality component and the molten iron quality component interval standard.

Optionally, with the molten iron temperature control interval standard as a benchmark target, the step of adjusting the proportion of the material quantity parameter according to the actual value of the molten iron quality component and the molten iron quality component interval standard includes:

When the temperature of the molten iron is higher than the center line of the standard of the molten iron temperature control interval and not higher than the upper limit of the standard of the molten iron temperature control interval, the proportion of the material quantity parameter is adjusted according to the actual value of the silicon content of the molten iron;

If the actual value of the silicon content of the molten iron is within the range standard of the silicon content of the molten iron, the proportion of the material quantity parameter remains unchanged;

If the actual value of the silicon content in the molten iron is higher than the upper limit of the silicon content interval standard in the molten iron, adjust the proportion of the material quantity parameter according to the first preset adjustment rule;

Wherein, the first preset rule is: every time the content deviation is higher than the upper limit of the silicon content interval standard of the molten iron by 0.05%, the alkalinity of the slag is reduced by 0.02 times.

Optionally, using the molten iron temperature control interval standard as a benchmark target, the step of adjusting the proportion of the material quantity parameter according to the actual value of the molten iron quality component and the molten iron quality component interval standard further includes:

When the molten iron temperature is higher than the upper limit of the molten iron temperature control interval standard, the coke ratio is reduced by 1kg/t for every 1°C higher than the standard;

When the molten iron temperature is lower than the standard lower limit of the molten iron temperature control interval, the coke ratio is increased by 2kg/t for every 1°C decrease.

Optionally, using the molten iron temperature control interval standard as a benchmark target, the step of adjusting the proportion of the material quantity parameter according to the actual value of the molten iron quality component and the molten iron quality component interval standard further includes:

When the temperature of the molten iron is lower than the center line of the standard of the molten iron temperature control interval and not lower than the lower limit of the standard of the molten iron temperature control interval, the proportion of the material quantity parameter is adjusted according to the actual value of the silicon content of the molten iron;

If the actual value of the silicon content of the molten iron is within the silicon content interval standard of the molten iron or is higher than the upper limit of the silicon content interval standard of the molten iron, then the proportion of the material quantity parameter remains unchanged;

If the actual value of the silicon content in the molten iron is lower than the lower limit of the silicon content interval standard in the molten iron, adjust the proportion of the material quantity parameter according to the second preset adjustment rule;

Wherein, the second preset adjustment rule is: every time the content deviation is lower than 0.05% of the lower limit of the molten iron silicon content interval standard, the coke ratio is increased by 1kg/t.

Optionally, when the sulfur content of the molten iron is higher than the upper limit of the sulfur content interval standard of the molten iron, the slag alkalinity is increased by 0.05 times for every 0.005% higher than the upper limit of the sulfur content interval standard of the molten iron.

Optionally, the step of correcting the proportion of the raw materials according to the adjusted material amount parameter includes:

Calculate the theoretical value of the adjusted quality index data of the material quantity parameter;

Use a correction coefficient to adjust the corresponding raw material ratio in the material quantity parameter;

Wherein, the actual value of the quality index data of the material quantity parameter is equal to the product of the theoretical value of the quality index data of the material quantity parameter and the correction coefficient.

Optionally, the quality index data with the top five corresponding weights among the multiple quality index data of each material quantity parameter are selected as the adjustment objects.

Optionally, the step of using a correction coefficient to adjust the corresponding raw material ratio in the material quantity parameter includes:

When the correction coefficient corresponding to the quality index data with the first weight is greater than the first preset value, only the proportion of raw materials corresponding to the quality index data with the first weight is adjusted;

When the correction coefficient corresponding to the quality index data ranked second in weight is greater than the second preset value, only the proportion of raw materials corresponding to the quality index data ranked second in weight is adjusted;

When the correction coefficient corresponding to the quality index data ranked third in weight is greater than the third preset value, only the proportion of raw materials corresponding to the quality index data ranked third in weight is adjusted;

When the correction coefficient corresponding to the quality index data ranked fourth in weight is greater than the fourth preset value, only the proportion of raw materials corresponding to the quality index data ranked fourth in weight is adjusted;

When the correction coefficient corresponding to the quality index data ranked fifth in weight is greater than the fifth preset value, only the proportion of raw materials corresponding to the quality index data ranked fifth in weight is adjusted.

According to another aspect of the present invention, a control system for blast furnace smelting is provided, including:

The molten iron composition calculation module is used to calculate the theoretical value of the molten iron quality composition based on the correspondence between the raw materials and the slag composition produced by the blast furnace; wherein the molten iron quality composition includes the silicon content of the molten iron and the sulfur content of the molten iron;

The adjustment module is used to adjust the proportion of the material quantity parameter based on the content deviation between the actual value and the theoretical value of the molten iron quality component, combined with the molten iron temperature indicator, and correct the proportion of the material quantity parameter according to the adjusted material quantity parameter. The proportion of the raw materials; wherein, the material quantity parameter at least includes sinter, ball ore and coke, and the material quantity parameter is formed by the raw material ore blending.

The technical solution provided by the embodiment of the present invention calculates the theoretical value of the molten iron quality component through the corresponding relationship between the raw material and the slag component produced by the blast furnace, and based on the content deviation between the actual value and the theoretical value of the molten iron quality component, combined with the molten iron Temperature index, adjust the proportion of material quantity parameters, and finally correct the proportion of raw materials according to the adjusted material quantity parameters. This solution uses data to correlate the blast furnace smelting process and quantitatively adjust the data during the smelting process, which can reduce fluctuations in furnace conditions caused by human intervention, and is conducive to achieving long-term stable operation of the blast furnace, stabilizing the quality index of blast furnace hot metal, and providing a basis for smelting high-quality steel. Provide strong support.

It should be understood that what is described in this section is not intended to identify key or important features of the embodiments of the invention, nor is it intended to limit the scope of the invention. Other features of the present invention will become easily understood from the following description.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can also be obtained based on these drawings without exerting creative efforts.

Figure 1 is a flow chart of a control method for blast furnace smelting provided by an embodiment of the present invention;

Figure 2 is a flow chart of another control method for blast furnace smelting provided by an embodiment of the present invention;

Figure 3 is a flow chart of another control method for blast furnace smelting provided by an embodiment of the present invention;

Figure 4 is a flow chart of another control method for blast furnace smelting provided by an embodiment of the present invention;

Figure 5 is a schematic structural diagram of a control system for blast furnace smelting provided by an embodiment of the present invention.

Detailed ways

In order to enable those skilled in the art to better understand the solutions of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only These are some embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts should fall within the scope of protection of the present invention.

It should be noted that the terms "first", "second", etc. in the description and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It is to be understood that the data so used are interchangeable under appropriate circumstances so that the embodiments of the invention described herein are capable of being practiced in sequences other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, e.g., a process, method, system, product, or apparatus that encompasses a series of steps or units and need not be limited to those explicitly listed. Those steps or elements may instead include other steps or elements not expressly listed or inherent to the process, method, product or apparatus.

Figure 1 is a flow chart of a control method for blast furnace smelting provided by an embodiment of the present invention. Referring to Figure 1, the control method for blast furnace smelting provided by this embodiment includes:

S110. Calculate the theoretical value of the molten iron mass composition based on the correspondence between the raw materials and the composition of the slag produced by the blast furnace.

Specifically, the iron content of molten iron produced by blast furnace smelting is more than 98%, and most of the chemical components other than iron in the raw materials are in the slag. By establishing a theoretical calculation model of the corresponding relationship between the raw materials and the slag components produced by the blast furnace, the slag components are calculated based on the raw materials, so that the theoretical value of the molten iron quality component can be obtained. Among them, the quality components of molten iron include the silicon content of molten iron and the sulfur content of molten iron.

S120. Based on the content deviation between the actual value and the theoretical value of the molten iron quality component, combined with the molten iron temperature index, adjust the proportion of the material quantity parameter.

Specifically, after the theoretical value of the molten iron mass composition is calculated based on the composition of the slag produced in the blast furnace, the theoretical value of the molten iron mass composition is compared with the mass composition of the molten iron produced by smelting when the same batch of raw materials enter the silo, and the mass composition of the molten iron is obtained. The content deviation between the actual value and the theoretical value of the molten iron mass composition includes the deviation of the silicon content of the molten iron and the deviation of the sulfur content of the molten iron.

Among them, the silicon content of the molten iron represents the chemical heat energy of the molten iron. High silicon content means more thermal energy, and low silicon content means less thermal energy. High sulfur content in the molten iron means insufficient thermal energy inside the blast furnace. Low sulfur content in the molten iron means that there is insufficient thermal energy inside the blast furnace. Plenty of calories. The temperature of molten iron directly represents the amount of smelting heat energy in the blast furnace. Therefore, on the basis of obtaining the content deviation between the actual value of the molten iron mass component and the theoretical value of the molten iron mass component, combined with the molten iron temperature index, the proportion of the material quantity parameter is adjusted. The material quantity parameters include at least sinter, ball ore and coke, and the material quantity parameters are formed by raw material ore blending. For example, sinter can be made from a variety of ores (ore powder) by adding auxiliary materials and then processing them with fuel. Ball ore and sinter are both processed from mineral powder, but the processes are different. Coke is heated by burning a variety of pulverized coal and adding auxiliary materials.

In this embodiment, the material quantity parameter is adjusted based on whether the detected molten iron temperature meets the molten iron temperature index and the actual value of the molten iron quality component. By adjusting the material quantity parameter, the mass composition of the molten iron can be changed to meet the demand.

S130. Correct the proportion of raw materials according to the adjusted material quantity parameters.

After determining the requirements for material quantity parameters, the corresponding raw material control standards can be obtained, and the proportion of raw materials can be corrected according to the corresponding control standards.

The technical solution provided by the embodiment of the present invention calculates the theoretical value of the molten iron quality component through the corresponding relationship between the raw material and the slag component produced by the blast furnace, and based on the content deviation between the actual value and the theoretical value of the molten iron quality component, combined with the molten iron Temperature index, adjust the proportion of material quantity parameters, and finally correct the proportion of raw materials according to the adjusted material quantity parameters. This solution uses data to correlate the blast furnace smelting process and quantitatively adjust the data during the smelting process, which can reduce fluctuations in furnace conditions caused by human intervention, and is conducive to achieving long-term stable operation of the blast furnace, stabilizing the quality index of blast furnace hot metal, and providing a basis for smelting high-quality steel. Provide strong support.

Figure 2 is a flow chart of another control method for blast furnace smelting provided by an embodiment of the present invention. Referring to Figure 2, based on the above technical solution, the control method provided by this embodiment includes:

S110. Calculate the theoretical value of the molten iron mass composition based on the correspondence between the raw materials and the composition of the slag produced by the blast furnace.

S1201. Establish molten iron quality composition interval standards and molten iron temperature control interval standards based on the needs of smelting steel types.

Among them, the molten iron temperature and molten iron quality composition required for smelting different steel materials are different, and the molten iron quality composition is determined by the composition of the raw materials. During the blast furnace smelting process, after the sinter and pellets added to the furnace are produced, they are transported to the lower silo of the blast furnace trough via a belt. The quality components are detected online on the belt, and the component data is dynamically displayed in real time; the coke is online during the transportation process. Ingredient testing. According to the needs of smelting steel types, establish the molten iron quality composition interval standard and the molten iron temperature control interval standard PT1-PT2. Among them, the molten iron quality composition interval standard includes the molten iron silicon content interval standard Si1-Si2 and the molten iron sulfur content interval standard S1-S2.

S1202. Taking the molten iron temperature control interval standard as the benchmark target, adjust the proportion of material quantity parameters according to the actual value of the molten iron quality component and the molten iron quality composition interval standard.

Set the molten iron temperature control interval standard as the benchmark target, detect the relationship between the actual value of the molten iron temperature and the benchmark target, determine whether to use the sulfur content of the molten iron or the silicon content of the molten iron as the basis for adjustment, and use the detected quality components of the molten iron (molten iron Whether the actual value of silicon content or sulfur content meets the molten iron quality composition interval standard, adjust the proportion of material quantity parameters (including but not limited to sinter, coke, pellet ore, etc.) to obtain the required material quantity parameters. Actual demand.

S130. Correct the proportion of raw materials according to the adjusted material quantity parameters.

Figure 3 is a flow chart of another control method for blast furnace smelting provided by an embodiment of the present invention. Referring to Figure 3, based on the above technical solution, step S1202 specifically includes:

S121. When the molten iron temperature is higher than the center line of the molten iron temperature control interval standard and not higher than the upper limit of the molten iron temperature control interval standard, adjust the proportion of the material quantity parameter according to the actual value of the silicon content of the molten iron.

In this embodiment, when setting the molten iron temperature control interval standard as the benchmark target, specifically, the center line (PT1+PT2)/2 of the molten iron temperature control interval standard may be set as the benchmark target. When the detected molten iron temperature is higher than the standard midline of the molten iron temperature control interval (PT1+PT2)/2 and not higher than the upper limit PT2 of the molten iron temperature control interval standard, the material quantity parameter is adjusted according to the actual value of the silicon content of the molten iron. proportion.

Specifically, if the actual value of the silicon content of the molten iron is within the standard Si1-Si2 range of the silicon content of the molten iron, the proportion of the material quantity parameter will not change, and therefore, the proportion of the raw materials will also not change.

If the actual value of the silicon content of the molten iron is higher than the upper limit Si2 of the standard Si1-Si2 range of the molten iron silicon content, the proportion of the material quantity parameter is adjusted according to the first preset adjustment rule. Among them, the first preset rule is: every time the content deviation is 0.05% higher than the upper limit of the standard upper limit of the molten iron silicon content interval, the slag basicity is reduced by 0.02 times, and so on. That is to say, the actual silicon content of the molten iron is greater than 0.05% Si2. By adjusting the proportion of ore entering the furnace, the slag alkalinity is reduced by 0.02 times to reduce the silicon content of the molten iron. The actual value of silicon content in molten iron is greater than 0.1% Si2. By adjusting the proportion of ore entering the furnace, the slag alkalinity is reduced by 0.04 times... Among them, slag alkalinity refers to the ratio of Mgo to Sio2 in all charge materials.

S122. When the molten iron temperature is higher than the upper limit of the molten iron temperature control interval standard, reduce the coke ratio by 1kg/t for every 1°C higher than the standard.

S123. When the molten iron temperature is lower than the standard lower limit of the molten iron temperature control interval, increase the coke ratio by 2kg/t for every 1°C decrease.

Among them, the coke ratio refers to the ratio of the amount of coke consumed to the amount of pig iron smelted. Here, the coke ratio can be reduced by reducing the amount of coke fed into the furnace. When the detected molten iron temperature is higher than the standard upper limit PT2 of the molten iron temperature control interval, the coke ratio is reduced by 1kg/t for every 1°C higher than the standard to lower the molten iron temperature and control the molten iron temperature within the temperature range that meets the requirements.

Similarly, when the molten iron temperature is lower than the standard lower limit PT1 of the molten iron temperature control interval, for every 1°C decrease, the coke ratio is increased by 2kg/t, and the molten iron temperature is increased by increasing the amount of coke entering the furnace. In the process of lowering or raising the temperature of the molten iron, the silicon content and sulfur content of the molten iron are not adjusted.

S124. When the molten iron temperature is lower than the center line of the molten iron temperature control interval standard and not lower than the lower limit of the molten iron temperature control interval standard, adjust the proportion of the material quantity parameter according to the actual value of the silicon content of the molten iron.

When the detected molten iron temperature is lower than the standard midline of the molten iron temperature control interval (PT1+PT2)/2 and not lower than the lower limit PT1 of the molten iron temperature control interval standard, the material quantity parameter is adjusted according to the actual value of the silicon content of the molten iron. proportion.

Specifically, if the actual value of the silicon content in the molten iron is within the silicon content interval standard in the molten iron or higher than the upper limit of the silicon content interval standard in the molten iron, the proportion of the material quantity parameter remains unchanged.

If the actual value of the silicon content of the molten iron is lower than the lower limit of the standard range of the silicon content of the molten iron, the proportion of the material quantity parameter is adjusted according to the second preset adjustment rule. Among them, the second preset adjustment rule is: every time the content deviation between the actual value and the theoretical value of silicon content in molten iron is lower than 0.05% of the standard lower limit PT1 of the silicon content range in molten iron, the coke ratio will be increased by 1kg/t.

Optionally, in this embodiment, when the detected sulfur content of the molten iron is higher than the upper limit S2 of the sulfur content interval standard of the molten iron, no matter which interval the values of the molten iron temperature and the silicon content of the molten iron are, they must be increased. Slag alkalinity. Specifically, for every 0.005% higher than the upper limit S2 of the molten iron sulfur content range standard, the slag basicity is increased by 0.05 times. For example, it may be possible to provide increased sinter usage to increase slag alkalinity.

When the detected sulfur content of molten iron is lower than the lower limit S1 of the sulfur content interval standard of molten iron, no adjustment will be made.

Figure 4 is a flow chart of another control method for blast furnace smelting provided by an embodiment of the present invention. Referring to Figure 4, based on the above technical solutions, step 130 specifically includes:

S1301. Calculate the theoretical value of the quality index data of the adjusted material quantity parameter.

Specifically, each material quantity parameter has its corresponding quality index data. The quality index data of sinter includes Fe, FeO, MgO, Al2O3, SiO2, CaO, Mn, Cu, S, As, Sn, Pb, Zn, P, K2O, Na2O, and the physical index data includes drum index and anti-wear index. , reduction degree, anti-wear index, average particle size, etc. The quality index data of ball ore is the same as that of sinter. Coke quality index data includes Ad, Vdaf, Std, Fcad, CSR, CRI, M40, Mt, etc. Among them, each material quantity parameter is processed from the corresponding raw material, and the material quantity parameter can be directly entered into the blast furnace for smelting.

The raw materials include ores x1, x2, x3... and auxiliary materials z1, z2, z3...zn (including limestone, dolomite, silica, etc.). In this embodiment, each raw material can be collected into the database according to its name when entering the factory. According to the types of raw materials used in the blast furnace, the corresponding raw materials can be dynamically added or reduced in real time, and the database can be updated.

The ore (ore powder) goes through the ore blending process (select any of the ore powders from x1, x2... Coke powder, coal powder, coal gas) are processed into sinter. The coke is prepared through coking coal (select any variety of coal from y1, y2, y3...yn as needed, gas combustion and heating, and adding z1, z2, z3... It is processed from any variety of auxiliary materials in zn.

After obtaining the adjusted material quantity parameters, the theoretical values of the quality index data of the material quantity parameters can be calculated based on the component detection and dosage of various raw materials.

S1302. Use the correction coefficient to adjust the corresponding raw material ratio in the material quantity parameter.

Specifically, since sinter, ball ore, coke, etc. are all heated or sintered from a variety of raw materials, the theoretical values of their quality index data and the actual values of the quality index data of the actually produced material quantity parameters must exist deviation.

In this embodiment, the theoretical value of the quality index data of the material quantity parameter can be corrected through the correction coefficient to eliminate the influence of personnel and equipment factors on the quality of the material quantity parameter in the sintering process or coking process. The correction coefficient can be used to reverse the Adjust the ore blending proportion of the material quantity parameters to stabilize the quality of the material quantity parameters. Among them, the actual value of the quality index data of the material quantity parameter is equal to the product of the theoretical value of the quality index data of the material quantity parameter and the correction coefficient. The correction coefficient can be obtained based on the historical value of the quality index data within a certain period of time. Among them, the closer the correction coefficient is to 1, the more stable the production is.

Each quality index data is an element, and each element corresponds to a correction coefficient. When the correction coefficient is greater than 1, the operation of increasing the proportion of the raw material with the highest content in the element can be performed. When the correction coefficient is less than 1, the operation of reducing the proportion of the raw material with the highest content in the element can be performed. The increased or decreased proportion is: : ABS (1-Correction coefficient)*Proportion of this raw material variety*Content of corresponding elements in this raw material variety. Taking sinter as an example, the specific method of using the correction coefficient to adjust the corresponding raw material ratio in the material quantity parameter is explained: sinter is prepared from four mineral powders: x1, x2, x3, and x4, among which x1 contains the highest Fe content. is 63%, and X1 accounts for 30% of the ore allocation. The required iron content in the sinter is 58%, and the iron content theoretically calculated through the ore blending process is 59%, then aFe*59%=58%, where a is the correction coefficient. According to the above formula, the correction coefficient a=0.983<1 can be obtained. Then it is necessary to reduce the proportion of x1, x2, x3 and Compared with the base, the usage of x1 raw materials is reduced by 0.3213%.

It should be understood that sinter, coke, and pellet ore all use the correction coefficient comparison method to quickly adjust the raw material ratio, while raw ore, injection pulverized coal, and other raw materials that can be directly fed into the blast furnace can be adjusted by adjusting the ratio. indicator content.

In this embodiment, optionally, since there are dozens of quality indicators such as sinter, coke, injection coal, ball ore, raw ore, auxiliary materials, etc., and various indicators have different effects on the blast furnace, reducing a certain Indicators may lead to the increase of other indicators, which will have an impact on the blast furnace. Therefore, among the multiple quality indicator data of each material quantity parameter, the top five quality indicator data with corresponding weights are selected as the adjustment object. The top five quality index data of sinter, ball ore and raw ore are: Fe, SiO2, Al2O3, FeO, drum index; the top five quality index data of coke are: CSR, Ad, Std, Fcad, M40; coal injection The top five quality index data of powder are: Fcad, Ad, Std, Vdaf, and particle size.

Specifically, step S1302 specifically includes:

When the correction coefficient corresponding to the quality index data with the first weight is greater than the first preset value, only the proportion of raw materials corresponding to the quality index data with the first weight is adjusted.

When the correction coefficient corresponding to the quality index data ranked second in weight is greater than the second preset value, only the proportion of raw materials corresponding to the quality index data ranked second in weight is adjusted.

When the correction coefficient corresponding to the quality index data ranked third in weight is greater than the third preset value, only the proportion of raw materials corresponding to the quality index data ranked third in weight is adjusted.

When the correction coefficient corresponding to the quality index data ranked fourth in weight is greater than the fourth preset value, only the proportion of raw materials corresponding to the quality index data ranked fourth in weight will be adjusted.

When the correction coefficient corresponding to the quality index data ranked fifth in weight is greater than the fifth preset value, only the proportion of raw materials corresponding to the quality index data ranked fifth in weight will be adjusted.

For example, the first five quality index data of sinter, coke, injection coal, pellet ore, raw ore, and auxiliary materials are sorted by their degree of influence on the quality of blast furnace hot metal. When the theoretical calculation value of the first element index data is When the correction coefficient corresponding to the actual product detection value is >0.01, the proportion of the first element is adjusted, and the other four elements follow the changes without special adjustments. When the correction coefficient of the second element is >0.02, the correction coefficient of the third element is >0.03, the correction coefficient of the fourth element is >0.04, and the correction coefficient of the fifth element is >0.05, all adjustments should be made accordingly according to the above method. This plan sorts the quality index data according to the degree of impact on the quality of the molten iron in the blast furnace. Adjust it first if it exceeds the standard. Only one element is adjusted at a time. The other plans without adjustments adjust the raw material ratio to ensure that the quality components of the molten iron meet the requirements and ensure that the blast furnace Anterograde stability.

Optionally, the present invention also provides a blast furnace smelting control system, which can be used to execute the blast furnace smelting control method provided by any embodiment of the present invention. Figure 5 is a schematic structural diagram of a control system for blast furnace smelting provided by an embodiment of the present invention. Referring to Figure 5 , the control system for blast furnace smelting includes:

The molten iron composition calculation module 11 is used to calculate the theoretical value of the molten iron quality composition based on the correspondence between the raw materials and the slag composition produced by the blast furnace; wherein the molten iron quality composition includes the silicon content of the molten iron and the sulfur content of the molten iron.

The adjustment module 12 is used to adjust the proportion of material quantity parameters based on the content deviation between the actual value and the theoretical value of the molten iron quality component, combined with the molten iron temperature indicator, and correct the proportion of raw materials according to the adjusted material quantity parameters. ; Among them, the material quantity parameters at least include sinter, ball ore and coke, and the material quantity parameters are formed by raw material ore blending. The adjustment module 12 can also be used to perform specific method steps for adjusting the proportion of material quantity parameters.

Since the blast furnace smelting control system provided by this embodiment can execute the blast furnace smelting control method provided by any of the above embodiments, the blast furnace smelting control system also has the beneficial effects described in any of the above embodiments. The blast furnace smelting control system provided in this embodiment formulates the blast furnace smelting molten iron quality composition control interval standard and temperature control interval standard, and automatically calculates the required sinter, According to the demand for components such as coke, pellet ore, and auxiliary materials, the sinter and coke blending plan is obtained, and the system is continuously revised to establish a molten iron quality composition standard control system, which runs through the entire blast furnace smelting process and realizes the digitalization of the entire process. Moreover, the operation of this system greatly reduces the fluctuations in furnace conditions caused by human intervention, which is conducive to the long-term stable operation of the blast furnace. The fuel consumption of the blast furnace can be reduced by 3-5kg/ton of iron, which is conducive to further reducing the energy consumption of the blast furnace.

It should be understood that various forms of the process shown above may be used, with steps reordered, added or deleted. For example, each step described in the present invention can be executed in parallel, sequentially, or in different orders. As long as the desired results of the technical solution of the present invention can be achieved, there is no limitation here.

The above-mentioned specific embodiments do not constitute a limitation on the scope of the present invention. It will be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions are possible depending on design requirements and other factors. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention shall be included in the protection scope of the present invention.

Claims (10)

1. A control method for blast furnace smelting, which is characterized by including: According to the corresponding relationship between the raw materials and the slag components produced by the blast furnace, the theoretical value of the molten iron quality component is calculated; wherein the molten iron quality component includes the silicon content of the molten iron and the sulfur content of the molten iron; Based on the content deviation between the actual value and the theoretical value of the molten iron quality component, combined with the molten iron temperature indicator, the proportion of the material quantity parameter is adjusted; wherein the material quantity parameter at least includes sinter, pellet ore and coke, The material quantity parameter is formed by the raw material ore blending; The proportion of the raw materials is corrected according to the adjusted material quantity parameters. 2. The control method of blast furnace smelting according to claim 1, characterized in that, based on the content deviation between the actual value and the theoretical value of the molten iron quality component, combined with the molten iron temperature index, the proportion of the material quantity parameter is determined. The steps to adjust the ratio include: According to the demand for smelting steel types, establish a molten iron quality composition interval standard and a molten iron temperature control interval standard; wherein, the molten iron quality composition interval standard includes a molten iron silicon content interval standard and a molten iron sulfur content interval standard; Taking the molten iron temperature control interval standard as a benchmark target, the proportion of the material quantity parameter is adjusted according to the actual value of the molten iron quality component and the molten iron quality component interval standard. 3. The control method of blast furnace smelting according to claim 2, characterized in that, the molten iron temperature control interval standard is used as a benchmark target, and the adjustment is performed according to the actual value of the molten iron quality component and the molten iron quality component interval standard. The steps of determining the proportion of the material quantity parameter include: When the temperature of the molten iron is higher than the center line of the standard of the molten iron temperature control interval and not higher than the upper limit of the standard of the molten iron temperature control interval, the proportion of the material quantity parameter is adjusted according to the actual value of the silicon content of the molten iron; If the actual value of the silicon content of the molten iron is within the range standard of the silicon content of the molten iron, the proportion of the material quantity parameter remains unchanged; If the actual value of the silicon content in the molten iron is higher than the upper limit of the silicon content interval standard in the molten iron, adjust the proportion of the material quantity parameter according to the first preset adjustment rule; Wherein, the first preset rule is: every time the content deviation is higher than the upper limit of the silicon content interval standard of the molten iron by 0.05%, the alkalinity of the slag is reduced by 0.02 times. 4. The control method of blast furnace smelting according to claim 3, characterized in that, the molten iron temperature control interval standard is used as a benchmark target, and the adjustment is performed according to the actual value of the molten iron quality component and the molten iron quality component interval standard. The step of determining the proportion of the material amount parameter also includes: When the molten iron temperature is higher than the upper limit of the molten iron temperature control interval standard, the coke ratio is reduced by 1kg/t for every 1°C higher than the standard; When the molten iron temperature is lower than the standard lower limit of the molten iron temperature control interval, the coke ratio is increased by 2kg/t for every 1°C decrease. 5. The control method of blast furnace smelting according to claim 4, characterized in that, the molten iron temperature control interval standard is used as a benchmark target, and the adjustment is performed according to the actual value of the molten iron quality component and the molten iron quality component interval standard. The step of determining the proportion of the material amount parameter also includes: When the temperature of the molten iron is lower than the center line of the standard of the molten iron temperature control interval and not lower than the lower limit of the standard of the molten iron temperature control interval, the proportion of the material quantity parameter is adjusted according to the actual value of the silicon content of the molten iron; If the actual value of the silicon content of the molten iron is within the silicon content interval standard of the molten iron or is higher than the upper limit of the silicon content interval standard of the molten iron, then the proportion of the material quantity parameter remains unchanged; If the actual value of the silicon content in the molten iron is lower than the lower limit of the silicon content interval standard in the molten iron, adjust the proportion of the material quantity parameter according to the second preset adjustment rule; Wherein, the second preset adjustment rule is: every time the content deviation is lower than 0.05% of the lower limit of the molten iron silicon content interval standard, the coke ratio is increased by 1kg/t. 6. The control method for blast furnace smelting according to any one of claims 3 to 5, characterized in that when the sulfur content of the molten iron is higher than the upper limit of the sulfur content interval standard of the molten iron, every time it is higher than the upper limit of the sulfur content interval standard, The sulfur content in molten iron should be 0.005% of the upper limit of the standard interval, and the alkalinity of the slag should be increased by 0.05 times. 7. The control method of blast furnace smelting according to claim 1, characterized in that the step of correcting the proportion of the raw materials according to the adjusted material quantity parameters includes: Calculate the theoretical value of the adjusted quality index data of the material quantity parameter; Use a correction coefficient to adjust the corresponding raw material ratio in the material quantity parameter; Wherein, the actual value of the quality index data of the material quantity parameter is equal to the product of the theoretical value of the quality index data of the material quantity parameter and the correction coefficient. 8. The control method of blast furnace smelting according to claim 7, characterized in that, among the multiple quality index data of each material quantity parameter, the top five quality index data with corresponding weights are selected as the adjustment object. 9. The control method for blast furnace smelting according to claim 8, characterized in that the step of using a correction coefficient to adjust the corresponding raw material ratio in the material quantity parameter includes: When the correction coefficient corresponding to the quality index data with the first weight is greater than the first preset value, only the proportion of raw materials corresponding to the quality index data with the first weight is adjusted; When the correction coefficient corresponding to the quality index data ranked second in weight is greater than the second preset value, only the proportion of raw materials corresponding to the quality index data ranked second in weight is adjusted; When the correction coefficient corresponding to the quality index data ranked third in weight is greater than the third preset value, only the proportion of raw materials corresponding to the quality index data ranked third in weight is adjusted; When the correction coefficient corresponding to the quality index data ranked fourth in weight is greater than the fourth preset value, only the proportion of raw materials corresponding to the quality index data ranked fourth in weight is adjusted; When the correction coefficient corresponding to the quality index data ranked fifth in weight is greater than the fifth preset value, only the proportion of raw materials corresponding to the quality index data ranked fifth in weight is adjusted. 10. A control system for blast furnace smelting, which is characterized by including: The molten iron composition calculation module is used to calculate the theoretical value of the molten iron quality composition based on the correspondence between the raw materials and the slag composition produced by the blast furnace; wherein the molten iron quality composition includes the silicon content of the molten iron and the sulfur content of the molten iron; The adjustment module is used to adjust the proportion of the material quantity parameter based on the content deviation between the actual value and the theoretical value of the molten iron quality component, combined with the molten iron temperature indicator, and correct the proportion of the material quantity parameter according to the adjusted material quantity parameter. The proportion of the raw materials; wherein, the material quantity parameter at least includes sinter, ball ore and coke, and the material quantity parameter is formed by the raw material ore blending.