Method for reducing cost of coke per ton iron based on adjustment of coking time of self-produced coke
By scientifically adjusting the coking time of the blast furnace self-produced coke, and combining actual production data to determine the optimal coking time and adjustment amount, the problem of not being able to achieve the optimal cost when the coke market price is low in the existing technology is solved, and the effect of significantly reducing the cost of tons of iron coke and improving production efficiency is achieved.
Patent Information
- Application Number
- CN202411678788.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-22
- Publication Date
- 2025-04-18
AI Technical Summary
Existing steel companies lack scientific methods when adjusting the coking time of self-produced coke, and cannot achieve optimal costs when the coke market price is low, thus losing the advantage of production cost.
By setting the cost composition of coke ton of iron, the total amount of coke required for ironmaking in blast furnace remains unchanged, the coke coking time of self-produced coke is extended to reduce the coke production of self-produced coke, and the purchase of purchased coke is increased. Based on the relationship function obtained by regression of the actual production data, the optimal coke time and the optimal coke adjustment amount are determined to minimize the cost of coke ton of iron.
When the price of the coke market fluctuates, it is realized that by adjusting the coking time of self-produced coke, it significantly reduces the total cost of tons of iron coke, improves production efficiency and market competitiveness, and reduces energy consumption, and meets the requirements of sustainable development.
Smart Images
Figure CN119842995A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the technical field of ironmaking coke regulation, and in particular to a method for reducing the coke cost per ton of iron by regulating the coking time of self-produced coke. Background Art
[0002] As the steel industry enters the era of low profits, production costs have gradually become one of the factors that determine the core competitiveness of existing steel companies. As an important fuel for blast furnace ironmaking, coke not only provides most of the heat for the separation of metallic iron and oxygen elements in the blast furnace, but also plays the role of "material column skeleton" that cannot be replaced by other injection fuels. It is an indispensable part of the calculation of ironmaking production costs.
[0003] Under the condition of stable blast furnace charge structure, quantitatively adjusting the coking time of self-produced coke and balancing the amount of self-produced coke and purchased coke is a controllable factor in reducing the production cost per ton of iron. Due to the instability of the coke market, there is always a difference between the cost of self-produced coke of steel enterprises and the market price of purchased coke. When the market price of purchased coke is lower than the cost of self-produced coke, extending the coking time of self-produced coke, thereby reducing the output of self-produced coke and increasing the purchase of purchased coke, is a commonly used adjustment method for steel enterprises. However, most enterprises only make slight adjustments based on the existing coking time. Due to the lack of scientific adjustment methods, they cannot obtain the optimal cost when the coke market price is low, thus losing the production cost advantage. Therefore, based on the current urgent situation of cost reduction and consumption reduction in the steel industry, it is very important to develop a scientific method to adjust the coking time. Summary of the invention
[0004] The purpose of the present invention is to overcome the deficiencies in the prior art and provide a method for adjusting the ratio of the amount of self-produced coke to the amount of purchased coke for a blast furnace, thereby reducing the coke cost per ton of iron in the blast furnace, adjusting the coking time of the self-produced coke through the relationship between the total cost of blast furnace coke and the coking time of self-produced coke, and controlling the output of self-produced coke and the purchase amount of purchased coke accordingly, thereby achieving the goal of reducing costs and saving expenses when the price of purchased coke is low.
[0005] To achieve the above object, the present invention provides a method for reducing the cost of coke per ton of iron by adjusting the coking time of self-produced coke, comprising the following steps:
[0006] Set the cost composition of coke per ton of iron, which includes the cost of self-produced coke W1 and the cost of purchased coke W2;
[0007] Under normal blast furnace conditions, the total amount of coke required for blast furnace ironmaking is kept constant, so that the sum of the self-produced coke benchmark usage and the purchased coke benchmark usage is a constant, and the constant is the self-produced coke benchmark usage A plus the purchased coke benchmark usage B;
[0008] When the market price of purchased coke is lower than the cost of self-produced coke, the coking time t of self-produced coke is extended to reduce the total number of furnaces produced per unit time to reduce the output of self-produced coke and increase the purchase volume of purchased coke;
[0009] The cost of self-produced coke W1 is calculated based on the self-produced coke adjustment amount x caused by extending the coking time t of self-produced coke, and the cost of purchased coke W2 is calculated based on the purchased coke adjustment amount -x caused by extending the coking time t of self-produced coke.
[0010] The cost of self-produced coke W1 is added to the cost of purchased coke W2 to obtain the total cost of coke per ton of iron W, and the changing trend of the total cost of coke per ton of iron W with the coking time t is analyzed. The linear function of the coking time of self-produced coke obtained by regression of actual production data affects the cost of coke per ton with respect to the coking time to form a relationship function, and the maximum value of the relationship function is solved to determine the optimal coking time and the optimal self-produced coke adjustment amount. The optimal coking time is determined to minimize the cost of coke per ton of iron, which provides an effective cost control method for steel enterprises in a complex and changing market environment and enhances the market competitiveness of enterprises.
[0011] Furthermore, the coking time of self-produced coke obtained by regression of actual production data affects the cost per ton of coke, which is a linear function of the coking time: at+b, wherein a is the first intermediate parameter, b is the second intermediate parameter, and the coking time is t.
[0012] Furthermore, the calculation formula for the self-produced coke cost W1 is:
[0013] W1=(Ax)[(at+b)Δt+C1]
[0014] Among them, A is the benchmark usage of self-produced coke, the value of at+b is the impact of the coking time of self-produced coke on the coking cost per ton, C1 is the benchmark coking cost per ton of self-produced coke, Δt is the change in the coking time of self-produced top-loading coke oven, Δt=t-t1, where t1 is the coking time before adjustment, t is the coking time, t>0, and x is the adjustment amount of self-produced coke.
[0015] Furthermore, the calculation formula for the cost of purchased coke W2 is:
[0016] W2=[B-(-x)]×C2
[0017] Among them, B is the benchmark amount of purchased coke, C2 is the benchmark cost per ton of purchased coke, and -x is the adjustment amount of purchased coke.
[0018] Furthermore, the self-produced coke adjustment amount x satisfies a min ≤x≤a max , where a min and a max They are respectively the lower limit and upper limit of self-produced coke output.
[0019] Furthermore, the total cost of coke per ton of iron W = W1 + W2 is a function of the coking time t of the self-produced coke oven:
[0020]
[0021] Where W is the total cost of coke per ton of iron;
[0022] A is the base amount of self-produced coke, and B is the base amount of purchased coke;
[0023] t1 is the coking time before adjustment, t1>0, and the upper and lower limits are adjusted according to the actual coking time of the enterprise, t max >t1>t>t min , t max is the upper limit of coking time of self-produced coke, t min The lower limit coking time of self-produced coke;
[0024] C1 is the benchmark ton cost of self-produced coke, and C2 is the benchmark ton cost of purchased coke.
[0025] Furthermore, the relationship between the self-produced coke adjustment amount x and the coking time t is:
[0026]
[0027] in, It is the benchmark amount of self-produced coke after adjustment, and A is the benchmark amount of self-produced coke.
[0028] Furthermore, by solving the maximum value of the relationship function, the minimum total coke cost W 佳 , determine the optimal coking time t 佳 and the optimal self-produced coke adjustment amount x 佳 .
[0029] Compared with the prior art, the present invention has the following beneficial effects:
[0030] (1) The present invention obtains the relationship between the total cost of blast furnace coke and the coking time of self-produced coke through mathematical modeling, scientifically adjusts the coking time of self-produced coke, and achieves the optimal balance between the output of self-produced coke and the purchase amount of purchased coke, allowing steel enterprises to respond to fluctuations in coke market prices by adjusting the coking time of self-produced coke, while maintaining the normal furnace condition of the blast furnace, significantly reducing the total cost of coke per ton of iron, and by accurately calculating the costs of self-produced coke and purchased coke, it is helpful for enterprises to allocate resources more reasonably and reduce unnecessary production cost expenditures. At the same time, by extending the coking time to reduce the output of self-produced coke, it can reduce energy consumption and manufacturing costs in the production process, thereby improving overall production efficiency and enhancing the market competitiveness of enterprises.
[0031] (2) The invention helps steel enterprises achieve the goal of energy conservation and emission reduction by optimizing the production process and reducing unnecessary energy consumption, which meets the requirements of sustainable development. At the same time, the implementation of the invention helps promote technological innovation in the field of coke production in the steel industry and promote technological progress and industrial upgrading in the entire industry. BRIEF DESCRIPTION OF THE DRAWINGS
[0032] Figure 1 A schematic flow chart of a method for reducing the cost of coke per ton of iron by adjusting the coking time of self-produced coke provided in an embodiment of the present invention;
[0033] Figure 2 A schematic diagram showing the influence of different coking times on coal blending costs provided in an embodiment of the present invention;
[0034] Figure 3 A schematic diagram of the influence of different coking times on processing costs provided in an embodiment of the present invention. DETAILED DESCRIPTION
[0035] The technical solution of the present invention is described in detail below through the accompanying drawings and specific embodiments. It should be understood that the embodiments of the present application and the specific features in the embodiments are detailed descriptions of the technical solution of the present application, rather than limitations on the technical solution of the present application. In the absence of conflict, the embodiments of the present application and the technical features in the embodiments can be combined with each other. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and cannot be used to limit the scope of protection of the present invention.
[0036] The term "and / or" in this article is only a description of the association relationship of the associated objects, indicating that there can be three relationships. For example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.
[0037] like Figure 1 As shown, this embodiment is a typical implementation of the present invention, and provides a method for reducing the cost of coke per ton of iron by adjusting the coking time of self-produced coke, which specifically includes the following steps:
[0038] Set the cost composition of coke per ton of iron, which includes the cost of self-produced coke W1 and the cost of purchased coke W2;
[0039] Under normal blast furnace conditions, the total amount of coke required for blast furnace ironmaking is kept constant, so that the sum of the self-produced coke benchmark usage and the purchased coke benchmark usage is a constant, and the constant is the self-produced coke benchmark usage A plus the purchased coke benchmark usage B;
[0040] When the market price of purchased coke is lower than the cost of self-produced coke, the coking time t of self-produced coke is extended to reduce the total number of furnaces produced per unit time to reduce the output of self-produced coke and increase the purchase volume of purchased coke;
[0041] The cost of self-produced coke W1 is calculated based on the self-produced coke adjustment amount x caused by extending the coking time t of self-produced coke, and the cost of purchased coke W2 is calculated based on the purchased coke adjustment amount -x caused by extending the coking time t of self-produced coke.
[0042] The cost of self-produced coke W1 is added to the cost of purchased coke W2 to obtain the total cost of coke per ton of iron W. The changing trend of the total cost of coke per ton of iron W with the coking time t is analyzed, and the linear function of the coking time of self-produced coke obtained by regression of actual production data that affects the cost per ton of coke with respect to the coking time is formed to form a relationship function. The optimal coking time is determined by finding the maximum value of the relationship function to minimize the cost of coke per ton of iron.
[0043] Specifically, the coking time of self-produced coke obtained by regression of actual production data affects the cost per ton of coke, which is a linear function of the coking time: at+b, wherein a is the first intermediate parameter, b is the second intermediate parameter, and the coking time is t.
[0044] Furthermore, the calculation formula for the self-produced coke cost W1 is:
[0045] W1=(Ax)[(at+b)Δt+C1]
[0046] Among them, A is the benchmark usage of self-produced coke, the value of at+b is the impact of the coking time of self-produced coke on the coking cost per ton, C1 is the benchmark coking cost per ton of self-produced coke, Δt is the change in the coking time of self-produced top-loading coke oven, Δt=t-t1, where t1 is the coking time before adjustment, t is the coking time, t>0, and x is the adjustment amount of self-produced coke.
[0047] Furthermore, the calculation formula for the cost of purchased coke W2 is:
[0048] W2=[B-(-x)]×C2
[0049] Among them, B is the benchmark amount of purchased coke, C2 is the benchmark cost per ton of purchased coke, and -x is the adjustment amount of purchased coke.
[0050] Specifically, the self-produced coke adjustment amount x satisfies a min ≤x≤a max , where a min and a max They are the lower limit and upper limit of self-produced coke output respectively, which ensure the safety and feasibility of the adjustment measures and avoid the production risks that may be caused by excessive adjustment.
[0051] Furthermore, the total cost of coke per ton of iron W = W1 + W2 is a function of the coking time t of the self-produced coke oven:
[0052]
[0053] Where W is the total cost of coke per ton of iron;
[0054] A is the base amount of self-produced coke, and B is the base amount of purchased coke;
[0055] t1 is the coking time before adjustment, t1>0, and the upper and lower limits are adjusted according to the actual coking time of the enterprise, t max >t1>t>t min , t max is the upper limit of coking time of self-produced coke, t min The lower limit coking time of self-produced coke;
[0056] C1 is the benchmark ton cost of self-produced coke, and C2 is the benchmark ton cost of purchased coke.
[0057] Specifically, the relationship between the self-produced coke adjustment amount x and the coking time t is:
[0058]
[0059] in, It is the benchmark amount of self-produced coke after adjustment, and A is the benchmark amount of self-produced coke.
[0060] Furthermore, by solving the maximum value of the relationship function, the minimum total coke cost W 佳 , determine the optimal coking time t 佳 and the optimal self-produced coke adjustment amount x 佳 .
[0061] In summary, the present invention can not only help steel enterprises effectively cope with the fluctuation of coke market prices, but also improve the economic and social benefits of enterprises through scientific and reasonable cost management measures.
[0062] As an example, in order to clearly illustrate the technical method of this scheme, the present invention is further elaborated in detail through a specific implementation scheme. A coking process production line is designed and invested, and dry coke quenching is adopted. After the cold coke discharged from the dry quenching furnace is screened by a bar screen, all qualified coke is transported to the blast furnace production line. The coking production line consists of four 6-meter 55-hole coke ovens, with two coke ovens as a group, and each group is equipped with a set of dry quenching equipment with a processing capacity of 140t / h. The temperature of the cold coke discharged from the dry quenching is less than 200°C, and all the self-produced coke on the screen enters the blast furnace production. Taking the coke oven production cost from January to June 2024 as the calculation basis for power, labor, manufacturing and other costs, the average daily self-produced coke benchmark is 7,000 tons, the purchased coke benchmark is 2,300 tons, and the average coking time of the coke oven is 21 hours. If the coking time is extended, the power, labor, manufacturing and other costs will increase, and the coal blending cost will decrease. According to the changes in coal blending cost and processing cost at different coking times from January to June 2024, the relationship between the change in coking cost per ton (Y) and the coking time (t) is obtained by regression: Y = 0.54t 2 -15.5t+89.52, according to the upper and lower limits of self-produced coke output, the extended coking time range is limited to 21h≤t≤28h.
[0063] like Figure 2 and Figure 3 As shown in the figure, the regression process of the relationship between the above-mentioned change in coke cost per ton (Y) and the coking time (t) is:
[0064] Coal blending cost table under different coking times:
[0065]
[0066] And the processing cost table under different coking time:
[0067]
[0068] The relationship between coking time and cost is Y = 0.54X 2 -15.5X+89.52(28≥X≥21)
[0069] Due to changes in the market situation, the benchmark cost of self-produced coke in July was 2,203 yuan, while the benchmark price of purchased coke was 2,017 yuan; the benchmark price of purchased coke was lower than the production cost of self-produced coke. Increasing the purchase volume of purchased coke requires appropriately extending the coking time to reduce the output of self-produced coke. Assuming the extended coking time is t, the cost calculation formula for self-produced coke is:
[0070]
[0071] The cost calculation formula for purchased coke is:
[0072]
[0073] The total cost of a ton of iron and coke W(t) = W1 + W2, combining the above formulas, we can get:
[0074]
[0075] Let W'=0, and calculate that when t=22.9, W takes the minimum value, 21h≤t≤28h, that is, when the coking time of self-produced coke is extended from 21 hours to 22.9 hours, the cost of coke per ton of iron is the lowest, and the cost is 20.0316 million yuan / day; when the coking time is 21 hours, the coke cost is 20.045 million yuan / day, that is, by extending the coking time by 1.9 hours, the cost of coke per ton of iron can be reduced by 13,400 yuan / day.
[0076] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.
[0077] The above are only preferred embodiments of the present invention. It should be pointed out that, for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.
Claims
1. A method for reducing the cost of coke per ton of iron by adjusting the coking time of self-produced coke, characterized in that: The following steps are involved: Set the cost composition of coke per ton of iron, which includes the cost of self-produced coke W1 and the cost of purchased coke W2; Under normal blast furnace conditions, the total amount of coke required for blast furnace ironmaking is kept constant, so that the sum of the self-produced coke benchmark usage and the purchased coke benchmark usage is a constant, and the constant is the self-produced coke benchmark usage A plus the purchased coke benchmark usage B; When the market price of purchased coke is lower than the cost of self-produced coke, the coking time t of self-produced coke is extended to reduce the total number of furnaces produced per unit time to reduce the output of self-produced coke and increase the purchase volume of purchased coke; The cost of self-produced coke W1 is calculated based on the adjustment amount x of self-produced coke caused by extending the coking time t of self-produced coke, and the cost of purchased coke W is calculated based on the adjustment amount -x of purchased coke caused by extending the coking time t of self-produced coke. 2， The cost of self-produced coke W1 is added to the cost of purchased coke W2 to obtain the total cost of coke per ton of iron W. The changing trend of the total cost of coke per ton of iron W with the coking time t is analyzed, and the linear function of the coking time of self-produced coke obtained by regression of actual production data that affects the cost per ton of coke with respect to the coking time is formed to form a relationship function. The optimal coking time is determined by finding the maximum value of the relationship function to minimize the cost of coke per ton of iron.
2. The method for reducing the cost of coke per ton of iron by adjusting the coking time of self-produced coke according to claim 1, characterized in that: The effect of the coking time of self-produced coke obtained by regression of actual production data on the coking time on the coking cost per ton is a linear function of the coking time: at+b, wherein a is the first intermediate parameter, b is the second intermediate parameter, and the coking time is t.
3. The method for reducing the cost of coke per ton of iron by adjusting the coking time of self-produced coke according to claim 2, characterized in that: The calculation formula for the self-produced coke cost W1 is: W1=(Ax)[(at+b)Δt+C1] Among them, A is the benchmark usage of self-produced coke, the value of at+b is the impact of the coking time of self-produced coke on the coking cost per ton, C1 is the benchmark coking cost per ton of self-produced coke, Δt is the change in the coking time of self-produced top-loading coke oven, Δt=t-t1, where t1 is the coking time before adjustment, t is the coking time, t>0, and x is the adjustment amount of self-produced coke.
4. The method for reducing the cost of coke per ton of iron by adjusting the coking time of self-produced coke according to claim 1, characterized in that: The calculation formula for the cost of purchased coke W2 is: W2=[B-(-x)]×C2 Among them, B is the benchmark amount of purchased coke, C2 is the benchmark cost per ton of purchased coke, and -x is the adjustment amount of purchased coke.
5. The method for reducing the cost of coke per ton of iron by adjusting the coking time of self-produced coke according to claim 1, characterized in that: The self-produced coke adjustment amount x satisfies a min ≤x≤a max , where a min and a max They are respectively the lower limit and upper limit of self-produced coke output.
6. The method for reducing the cost of coke per ton of iron by adjusting the coking time of self-produced coke according to claim 5, characterized in that: The total cost of coke per ton of iron W = W1 + W2 is a function of the coking time t of the self-produced coke oven: Where W is the total cost of coke per ton of iron; A is the base amount of self-produced coke, and B is the base amount of purchased coke; t1 is the coking time before adjustment, t1>0, and the upper and lower limits are adjusted according to the actual coking time of the enterprise. t max >t1>t>t min , t max is the upper limit of coking time of self-produced coke, t min The lower limit coking time of self-produced coke; C1 is the benchmark ton cost of self-produced coke, and C2 is the benchmark ton cost of purchased coke.
7. The method for reducing the cost of coke per ton of iron by adjusting the coking time of self-produced coke according to claim 1, characterized in that: The relationship between the self-produced coke adjustment amount x and the coking time t is: in, It is the benchmark amount of self-produced coke after adjustment, and A is the benchmark amount of self-produced coke.
8. The method for reducing the cost of coke per ton of iron by adjusting the coking time of self-produced coke according to claim 6, characterized in that: By solving the maximum value of the relationship function, the minimum total coke cost W is obtained. 佳 , and determine the optimal coking time t 佳 and the optimal self-produced coke adjustment amount x 佳 .