Method for calculating diameter of tuyere in high-titanium blast furnace

Abstract

The invention provides a method for calculating the diameter of a tuyere in a high-titanium blast furnace, and relates to the technical field of blast furnace design. Obtaining a calculation formula of the appropriate tuyere speed of the target blast furnace according to the condition that the appropriate tuyere speed of the target blast furnace meets the condition that the blast thrust is equal to the sum of the furnace charge gravity and the friction force between the furnace charge and the furnace wall, calculating the appropriate tuyere blast area of the target blast furnace, and calculating the tuyere diameter according to the tuyere number and the appropriate tuyere speed, the method solves the problem that the diameter of the tuyere cannot be calculated during design of the high-titanium blast furnace, and is suitable for design of the tuyere of the high-titanium blast furnace.

Description

Technical Field

[0001] The invention relates to the technical field of blast furnace design, in particular to a method for calculating the diameter of an inner tuyere of a high-titanium blast furnace. Background Art

[0002] Blast furnace ironmaking is a comprehensive process. Each process parameter design has different degrees of influence on blast furnace production. Blast furnace tuyere is one of the important air supply equipment of blast furnace. Tuyere has existed since the blast furnace ironmaking production process. Blast furnace blast and injected fuel all enter the blast furnace through the tuyere. Tuyere parameters mainly include tuyere number, height, diameter, angle and length. Tuyere parameters have important influence on its own life and technical and economic indicators of ironmaking blast furnace production, and are one of the important means of adjusting the lower part of the blast furnace.

[0003] The size of the blast furnace tuyere air inlet area directly affects the combustion efficiency and the stability of the furnace pressure. Too large or too small an air inlet area will have an adverse effect on the operation of the blast furnace. Therefore, correctly calculating the tuyere air inlet area is the key to ensuring the stable and efficient operation of the blast furnace. The selection of the blast furnace tuyere diameter directly determines the blast furnace tuyere air inlet area, which directly affects the production technology and economic indicators after the blast furnace is put into production. Blast furnace designers generally determine the tuyere diameter by analogy with similar blast furnaces that have been put into production. At the same time, there are fewer methods for determining the tuyere diameter of high-titanium blast furnaces. Summary of the invention

[0004] The technical problem solved by the present invention is to provide a method for calculating the diameter of the tuyere in a high-titanium blast furnace, so as to solve the problem that the diameter of the tuyere cannot be calculated when designing the high-titanium blast furnace.

[0005] The present invention solves the above technical problems by adopting a technical solution: a method for calculating the diameter of the tuyere in a high-titanium blast furnace, comprising the following steps:

[0006] S1. Calculate the gravity of the charge on the upper part of the target blast furnace tuyere plane;

[0007] S2. Calculate the friction between the charge and the furnace wall;

[0008] S3, defining the relationship between the blast thrust and the tuyere velocity of the target blast furnace;

[0009] S4. According to the requirement that the appropriate tuyere speed of the target blast furnace satisfies: the blast thrust is equal to the sum of the gravity of the furnace charge and the friction force, a calculation formula for the appropriate tuyere speed of the target blast furnace is obtained;

[0010] S5. Calculate the appropriate tuyere blast area of ​​the target blast furnace, and calculate the tuyere diameter based on the number of tuyere.

[0011] Furthermore, the calculation formula for charge gravity is: Among them, F g represents the charge weight, ρm represents the density of mixed charge, g represents the acceleration of gravity, H represents the distance from the tuyere plane to the top charge surface, L represents the depth of the charge line, and D t Indicates the blast furnace throat diameter, D d represents the diameter of the blast furnace hearth, and π represents pi.

[0012] Furthermore, the calculation formula for the density of the mixed charge is: Where ρ0 represents the true density of the ore, ρ c represents the true density of coke, ε represents the average porosity of block-shaped charge, m0 represents the consumption of ore required to produce 1 ton of iron, m c Indicates the amount of coke required to produce 1 ton of iron.

[0013] Furthermore, the friction force calculation formula is: Among them, F f is the friction between the charge and the furnace wall, u represents the charge speed, d m Indicates the average particle size of the charge.

[0014] Furthermore, the relationship between the blast thrust and the tuyere velocity of the blast furnace is: Among them, F s Indicates the blast thrust, P x Indicates the difference between blast pressure and furnace top pressure, ρ a represents the blast density, v f Indicates the wind speed at the air outlet, λ ε Indicates the blast loss coefficient.

[0015] Furthermore, the calculation formula for the appropriate tuyere velocity of the blast furnace is: Among them, v opt Indicates the suitable tuyere speed for blast furnace.

[0016] Furthermore, the calculation formula of the tuyere blast area is: Among them, S opt It represents the blast area of ​​the tuyere, and Q represents the blast volume.

[0017] Furthermore, the calculation formula of the tuyere diameter is: where d opt represents the diameter of the air outlet, and n represents the number of air outlets.

[0018] The beneficial effects of the present invention are as follows: the present invention provides a method for calculating the diameter of a tuyere in a high-titanium blast furnace. The method calculates the gravity of the charge on the tuyere plane of a target blast furnace, the friction between the charge and the furnace wall, and defines the relationship between the blast thrust and the tuyere speed of the target blast furnace. According to the suitable tuyere speed of the target blast furnace, the blast thrust is equal to the sum of the gravity of the charge and the friction between the charge and the furnace wall. The calculation formula for the suitable tuyere speed of the target blast furnace is obtained, the suitable tuyere blast area of ​​the target blast furnace is calculated, and the tuyere diameter is calculated according to the number of tuyeres and the suitable tuyere speed, thereby solving the problem that the tuyere diameter cannot be calculated when designing a high-titanium blast furnace. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 The present invention provides a flow chart of a method for calculating the diameter of a tuyere in a high-titanium blast furnace. DETAILED DESCRIPTION

[0020] The present invention aims at the problem that the diameter of the tuyere cannot be calculated when designing a high-titanium blast furnace, and provides a method for calculating the diameter of the tuyere in a high-titanium blast furnace. Figure 1 As shown, the following steps are included:

[0021] S1. Calculate the weight of the charge above the tuyere plane of the target blast furnace;

[0022] Specifically, the calculation formula for charge gravity is: where F g represents the charge weight, ρ m represents the density of mixed charge, g represents the acceleration of gravity, H represents the distance from the tuyere plane to the top charge surface, L represents the depth of the charge line, and D t Indicates the blast furnace throat diameter, D d represents the diameter of the blast furnace hearth, and π represents the ratio of circumference to pi. The calculation formula for the density of the mixed charge is: Where ρ0 represents the true density of the ore, ρ c represents the true density of coke, ε represents the average porosity of block-shaped charge, m0 represents the consumption of ore required to produce 1 ton of iron, m c Indicates the amount of coke required to produce 1 ton of iron.

[0023] S2. Calculate the friction between the charge and the furnace wall;

[0024] Specifically, the friction force calculation formula is: Among them, F f is the friction between the charge and the furnace wall, u represents the charge speed, d m Indicates the average particle size of the charge.

[0025] S3, defining the relationship between the blast thrust and the tuyere velocity of the target blast furnace;

[0026] Specifically, the relationship between the furnace blast thrust and the tuyere velocity is: Among them, F s Indicates the blast thrust, P x Indicates the difference between blast pressure and furnace top pressure, ρ a represents the blast density, v f Indicates the wind speed at the air outlet, λ ε Indicates the blast loss coefficient.

[0027] S4. According to the requirement that the appropriate tuyere speed of the target blast furnace satisfies: the blast thrust is equal to the sum of the gravity of the furnace charge and the friction force, a calculation formula for the appropriate tuyere speed of the target blast furnace is obtained;

[0028] Specifically, the blast thrust is equal to the sum of the charge weight and the friction force, that is, F g =F s +F f Substituting the above expression into the calculation formula for the appropriate tuyere velocity of the target blast furnace is: Among them, v opt Indicates the suitable tuyere speed for blast furnace.

[0029] S5. Calculate the appropriate tuyere blast area of ​​the target blast furnace, and calculate the tuyere diameter according to the number of tuyere and the appropriate tuyere velocity.

[0030] Specifically, the calculation formula for the blast area of ​​the tuyere is: Among them, S opt represents the blast area of ​​the tuyere, and Q represents the blast volume. The calculation formula for the tuyere diameter is: where d opt represents the diameter of the air outlet, and n represents the number of air outlets.

[0031] Example:

[0032] The design parameters of a high titanium blast furnace are shown in Table 1:

[0033] Table 1 Parameters of a high titanium blast furnace

[0034]

[0035]

[0036] Step 1: Calculate the weight of the charge above the tuyere plane of the target blast furnace;

[0037] Specifically, first use the formula: The calculated density of the mixed charge is 983.81 kg / m 3 , and then use the formula: The weight of the charge above the target blast furnace tuyere plane is calculated to be 7349855.04N.

[0038] Step 2: Calculate the friction between the charge and the furnace wall;

[0039] Specifically, using the formula The friction force between the charge and the furnace wall is calculated to be 40894.52N.

[0040] Step 3: Define the relationship between blast thrust and air outlet velocity as

[0041] Step 4: According to the requirement that the appropriate tuyere speed satisfies: the blast thrust is equal to the sum of the charge weight and the friction force, the calculation formula for the appropriate tuyere speed of the high titanium blast furnace is obtained as follows: Substituting the parameters in Table 1, it can be obtained that the suitable wind speed for this high-titanium blast furnace is 197.28 m / s.

[0042] Step 5: Calculate the appropriate tuyere blast area of ​​the target blast furnace, and calculate the tuyere diameter according to the number of tuyere and the appropriate tuyere speed. Specifically, use The calculated suitable blast area of ​​the tuyere is 0.2408m 2 ,use The calculated tuyere diameter is 0.1305m. At the same time, the corresponding radius can be calculated using the relationship between diameter and radius. Therefore, the tuyere diameter of this high-titanium blast furnace is 0.1305m.

Claims

1. A method for calculating the diameter of the tuyere in a high-titanium blast furnace, characterized in that: The following steps are involved: S1. Calculate the weight of the charge above the tuyere plane of the target blast furnace; S2. Calculate the friction between the charge and the furnace wall; S3, defining the relationship between the blast thrust and the tuyere velocity of the target blast furnace; S4. According to the requirement that the appropriate tuyere speed of the target blast furnace satisfies: the blast thrust is equal to the sum of the gravity of the furnace charge and the friction force, a calculation formula for the appropriate tuyere speed of the target blast furnace is obtained; S5. Calculate the appropriate tuyere blast area of ​​the target blast furnace, and calculate the tuyere diameter according to the number of tuyere and the appropriate tuyere velocity.

2. The method for calculating the diameter of the tuyere in a high-titanium blast furnace according to claim 1, characterized in that: The calculation formula of charge gravity is: where F g represents the charge weight, ρ m represents the density of mixed charge, g represents the acceleration of gravity, H represents the distance from the tuyere plane to the top charge surface, L represents the depth of the charge line, and D t Indicates the blast furnace throat diameter, D d represents the diameter of the blast furnace hearth, and π represents the ratio of a circle to a circle.

3. The method for calculating the diameter of the tuyere in a high-titanium blast furnace according to claim 2, characterized in that: The calculation formula of mixed charge density is: Where ρ0 represents the true density of the ore, ρ c represents the true density of coke, ε represents the average porosity of block-shaped charge, m0 represents the consumption of ore required to produce 1 ton of iron, m c Indicates the consumption of coke required to produce 1 ton of iron.

4. The method for calculating the diameter of the tuyere in a high-titanium blast furnace according to claim 2 or 3, characterized in that: The friction force calculation formula is: Among them, F f is the friction between the charge and the furnace wall, u represents the charge speed, d m Indicates the average particle size of the charge.

5. The method for calculating the diameter of the tuyere in a high-titanium blast furnace according to claim 4, characterized in that: The relationship between blast furnace blast thrust and tuyere speed is: Among them, F s Indicates the blast thrust, P x Indicates the difference between blast pressure and furnace top pressure, ρ a represents the blast density, v f Indicates the wind speed at the air outlet, λ ε Indicates the blast loss coefficient.

6. The method for calculating the diameter of the tuyere in a high-titanium blast furnace according to claim 5, characterized in that: The calculation formula for the appropriate tuyere velocity of the blast furnace is: Among them, v opt Indicates the suitable tuyere speed for blast furnace.

7. The method for calculating the diameter of the tuyere in a high-titanium blast furnace according to claim 6, characterized in that: The calculation formula of the blast area of ​​the tuyere is: Among them, S opt It represents the blast area of ​​the tuyere, and Q represents the blast volume.

8. The method for calculating the diameter of the tuyere in a high-titanium blast furnace according to claim 7, characterized in that: The calculation formula for the air outlet diameter is: where d opt represents the diameter of the air outlet, and n represents the number of air outlets.

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