Method for eliminating material deviation of blast furnace

Abstract

The invention discloses a method for eliminating material deviation of a blast furnace, which belongs to the technical field of material distribution of the blast furnace and comprises the following steps of: S1, expanding a material distribution angle and increasing the number of circles of a coke outer ring so as to increase the amount of coke in an edge area; s2, correspondingly increasing the coke batch according to the coke amount increased in the step S1; s3, reducing the angle of a coke inner ring to occupy a central area; s4, measuring the material flow track of coke by using a blast furnace material flow track monitoring technology; and S5, according to the measurement result of the step S4, performing fine adjustment on the material distribution angle, the number of circles of the coke outer ring and the angle of the inner ring to obtain the optimal coal gas distribution. The material deviation phenomenon can be rapidly corrected, the normal material distribution system of the blast furnace is recovered, the uniformity of gas distribution is ensured, the fuel utilization rate is increased, and stable operation and efficient production of the blast furnace are guaranteed.

Description

Technical Field

[0001] The invention belongs to the technical field of blast furnace material distribution, and in particular relates to a method for eliminating blast furnace material deviation. Background Art

[0002] In the modern steel production process, blast furnace smelting plays a vital role, and its production efficiency and cost control directly affect the competitiveness of the entire steel industry. In the blast furnace smelting process, the quality of the distribution effect is directly related to the uniformity of gas distribution, the fuel ratio and the stability of the furnace condition. However, in actual production, the phenomenon of blast furnace material deviation is a common problem that is difficult to completely avoid, which has an adverse impact on the efficiency and cost of blast furnace smelting. There are many reasons for the occurrence of blast furnace material deviation. For example, due to improper operation or equipment failure, the slag and iron discharge in the north and south yards of the blast furnace is uneven, causing the material surface in the furnace to be skewed; for example, the fluctuation of quality parameters such as the particle size and composition of the raw materials will change the permeability of the blast furnace, resulting in obstruction of the central material layer and uneven gas at the edge; in addition, unreasonable design of the blast furnace structure or improper setting of operating parameters may also cause material deviation. After the blast furnace is skewed, the original charging system cannot function and the charging system becomes unreasonable, which directly affects the smelting effect of the blast furnace. What is more serious is that long-term charging will cause the soft melting zone to shift and deflect, further causing unreasonable gas distribution, which not only increases the fuel ratio of the blast furnace, but also reduces the smoothness of the furnace condition.

[0003] Therefore, a method for eliminating blast furnace material deviation by quickly correcting gas distribution and reducing blast furnace fuel ratio is needed. Summary of the invention

[0004] The purpose of the present invention is to provide a method for eliminating blast furnace material deviation, which can quickly correct the material deviation phenomenon, restore the normal material distribution system of the blast furnace, ensure the uniformity of gas distribution, improve fuel utilization, and ensure stable operation and efficient production of the blast furnace.

[0005] To achieve the above purpose, the technical solution adopted by the present invention is:

[0006] A method for eliminating blast furnace material deviation comprises the following steps:

[0007] Step S1: enlarging the distribution angle and increasing the number of outer rings of coke to increase the amount of coke in the edge area;

[0008] Step S2: increasing the coke batch size accordingly according to the amount of coke increased in step S1;

[0009] Step S3: reducing the inner ring angle of the coke to occupy the central area;

[0010] Step S4: using blast furnace material flow trajectory monitoring technology to measure the material flow trajectory of coke;

[0011] Step S5: Based on the measurement results of step S4, fine-tune the distribution angle, the number of outer coke rings and the inner ring angle to obtain the best gas distribution.

[0012] A further improvement of the technical solution of the present invention is that for every 1 degree increase in the distribution angle, the number of outer coke rings increases by 1, while the inner coke ring angle decreases by 1-2 degrees.

[0013] A further improvement of the technical solution of the present invention is that in step S1, the material distribution angle is enlarged by 1 degree and the number of outer rings of coke is increased by 1 circle.

[0014] A further improvement of the technical solution of the present invention is that in step S3, the inner ring angle of the coke is reduced by 1-2 degrees.

[0015] A further improvement of the technical solution of the present invention is that in step S4, measuring the flow trajectory of coke using a radar monitoring device comprises the following steps:

[0016] Step S401: installing a radar monitoring device on the furnace wall near the highest material level of the blast furnace, wherein the irradiation point of the radar monitoring device is located between the chute and the material surface; the radar monitoring device includes a radar body provided with an antenna and a waveguide, and a computer connected to the radar body via a communication interface;

[0017] Step S402: When laying materials, the radar body transmits continuous frequency modulated waves through the antenna;

[0018] Step S403: The radar body receives echo signals reflected by the furnace wall, the far-end material flow, and the near-end material flow, and uploads the signals to the computer through the communication interface;

[0019] Step S404: The computer uses the fast Fourier transform method FFT to process the echo signal to obtain the echo signal frequency, converts the echo data into the distance from the material to the radar, and obtains the material flow trajectory.

[0020] A further improvement of the technical solution of the present invention is that in step S404, the distance calculation formula from the material to the radar is as follows:

[0021] s=K·f

[0022]

[0023] Where s represents the radar measurement distance, K represents the constant coefficient related to radar measurement, f represents the echo signal frequency, c represents the propagation speed of electromagnetic waves in the medium, and B represents the frequency modulation bandwidth of the radar system, that is, the difference between the maximum frequency and the minimum frequency.

[0024] A further improvement of the technical solution of the present invention is that in step S402, the radar body continuously transmits high-frequency microwaves by frequency conversion from 24 GHz to 26 GHz through the antenna.

[0025] Due to the adoption of the above technical solution, the technical progress achieved by the present invention is:

[0026] The method for eliminating blast furnace material deviation of the present invention can quickly correct the material deviation phenomenon, restore the normal material distribution system of the blast furnace, ensure the uniformity of gas distribution, improve fuel utilization, and ensure stable operation and efficient production of the blast furnace. DETAILED DESCRIPTION

[0027] The present invention is further described in detail below in conjunction with embodiments:

[0028] The present invention provides a method for eliminating blast furnace material deviation, comprising the following steps:

[0029] Step S1: expanding the distribution angle and increasing the number of coke outer rings to increase the amount of coke in the edge area. Specifically, the number of coke outer rings increases by 1 circle for every 1 degree expansion of the distribution angle. Preferably, the number of coke outer rings increases by 1 circle for every 1 degree expansion of the distribution angle.

[0030] Step S2: increasing the coke batch size accordingly according to the amount of coke increased in step S1;

[0031] Step S3: reducing the inner ring angle of the coke to occupy the central area. Specifically, for every 1 degree increase in the distribution angle, the inner ring angle of the coke is reduced by 1-2 degrees. Preferably, the inner ring angle of the coke is reduced by 1-2 degrees.

[0032] Step S4: using blast furnace material flow trajectory monitoring technology to measure the material flow trajectory of coke, so as to ensure that the coke is distributed along the expected path; the blast furnace material flow trajectory monitoring technology can adopt laser grid and scanning technology, blast furnace top camera and thermal imager, blast furnace tuyere camera device, radar monitoring device or SW blast furnace infrared thermal imager, wherein the use of radar monitoring device to measure the material flow trajectory of coke includes the following steps:

[0033] Step S401: a radar monitoring device is installed on the furnace wall near the highest material level of the blast furnace, and the irradiation point of the radar monitoring device is located between the chute and the material surface; the radar monitoring device includes a radar body provided with an antenna and a waveguide, and a computer connected to the radar body through a communication interface, wherein the communication interface can be wired communication or wireless communication;

[0034] Step S402: When laying materials, the radar body transmits continuous frequency-modulated waves through the antenna, that is, the radar body continuously transmits high-frequency microwaves by frequency conversion from 24 GHz to 26 GHz through the antenna;

[0035] Step S403: The radar body receives echo signals reflected by the furnace wall, the far-end material flow, and the near-end material flow, and uploads the signals to the computer through the communication interface;

[0036] Step S404: The computer uses the fast Fourier transform method FFT to process the echo signal to obtain the echo signal frequency, and correctly converts the echo data into the distance from the material to the radar, thereby obtaining the material flow trajectory. That is, by continuously measuring the distance at multiple time points, the position of the material surface at different times can be obtained. These position data can construct the material flow trajectory, that is, the movement path of the material in space and time. The distance calculation formula from the material to the radar is as follows:

[0037] s=K·f

[0038]

[0039] In the formula, s represents the radar measurement distance, K represents the constant coefficient related to the radar measurement, f represents the echo signal frequency, c represents the propagation speed of electromagnetic waves in the medium (for air, it is close to the speed of light), and B represents the frequency modulation bandwidth of the radar system, that is, the difference between the maximum frequency and the minimum frequency;

[0040] Step S5: Based on the measurement results of step S4, fine-tune the distribution angle, the number of outer coke rings and the inner ring angle to obtain the best gas distribution.

[0041] It is to be understood that the present invention is described by some embodiments, and it is known to those skilled in the art that various changes or equivalent substitutions may be made to these features and embodiments without departing from the spirit and scope of the present invention. In addition, under the teachings of the present invention, these features and embodiments may be modified to adapt to specific circumstances and materials without departing from the spirit and scope of the present invention. Therefore, the present invention is not limited by the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application are within the scope of protection of the present invention.

Claims

1. A method for eliminating blast furnace material deviation, characterized in that The following steps are involved: Step S1: enlarging the distribution angle and increasing the number of outer rings of coke to increase the amount of coke in the edge area; Step S2: increasing the coke batch size accordingly according to the amount of coke increased in step S1; Step S3: reducing the inner ring angle of the coke to occupy the central area; Step S4: using blast furnace material flow trajectory monitoring technology to measure the material flow trajectory of coke; Step S5: Based on the measurement results of step S4, fine-tune the distribution angle, the number of outer coke rings and the inner ring angle to obtain the best gas distribution.

2. A method for eliminating blast furnace material deviation according to claim 1, characterized in that: For every 1 degree increase in the distribution angle, the number of outer coke rings increases by 1, while the inner coke ring angle decreases by 1-2 degrees.

3. A method for eliminating blast furnace material deviation according to claim 2, characterized in that: In step S1, the feeding angle is increased by 1 degree and the number of outer rings of coke is increased by 1 circle.

4. A method for eliminating blast furnace material deviation according to claim 3, characterized in that: In step S3, the inner ring angle of the coke is reduced by 1-2 degrees.

5. A method for eliminating blast furnace material deviation according to claim 4, characterized in that: In step S4, using a radar monitoring device to measure the flow trajectory of coke includes the following steps: Step S401: installing a radar monitoring device on the furnace wall near the highest material level of the blast furnace, wherein the irradiation point of the radar monitoring device is located between the chute and the material surface; the radar monitoring device comprises a radar body provided with an antenna and a waveguide, and a computer connected to the radar body via a communication interface; Step S402: When laying materials, the radar body transmits continuous frequency modulated waves through the antenna; Step S403: The radar body receives echo signals reflected by the furnace wall, the far-end material flow, and the near-end material flow, and uploads the signals to the computer through the communication interface; Step S404: The computer uses the fast Fourier transform method FFT to process the echo signal to obtain the echo signal frequency, converts the echo data into the distance from the material to the radar, and obtains the material flow trajectory.

6. A method for eliminating blast furnace material deviation according to claim 5, characterized in that: In step S404, the distance from the material to the radar is calculated as follows: s=K·f Where s represents the radar measurement distance, K represents the constant coefficient related to radar measurement, f represents the echo signal frequency, c represents the propagation speed of electromagnetic waves in the medium, and B represents the frequency modulation bandwidth of the radar system, that is, the difference between the maximum frequency and the minimum frequency.

7. A method for eliminating blast furnace material deviation according to claim 5, characterized in that: In step S402, the radar body continuously transmits high-frequency microwaves by frequency conversion from 24 GHz to 26 GHz through the antenna.

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