Intelligent control device and method for blast furnace oxygen enrichment adjustment

Abstract

The application discloses an intelligent control device and method for blast furnace oxygen enrichment adjustment, and belongs to the technical field of blast furnace metallurgy. The blast furnace oxygen enrichment main pipe outlet pressure gauge C, the oxygen enrichment large branch pipe flow gauge, the pressure gauge B, the pressure gauge A, the oxygen enrichment main pipe pressure gauge, the oxygen enrichment cut-off valve, the large branch pipe valve, the pressure regulating valve B, the pressure regulating valve A, the small branch pipe valve and the small branch pipe oxygen enrichment flow gauge are arranged to be controlled by an externally connected computer CRT control system and a display. By collecting the blast furnace oxygen enrichment main pipe outlet pressure, the oxygen enrichment large branch pipe flow gauge, the small branch pipe flow gauge, the pressure gauge, the oxygen enrichment main pipe pressure value and the oxygen enrichment cut-off valve state, the oxygen enrichment flow value corresponding to the actual opening degree of each valve and the relative error thereof are calculated, after analysis and judgment, the blast furnace oxygen enrichment is real-timely regulated and controlled, the adjustment is timely and accurate, the safety and efficient production of the blast furnace is ensured, the quantitative control of the blast furnace oxygen enrichment is realized, the production cost is reduced, and the waste of resources is reduced.

Description

Technical Field

[0001] This invention relates to the field of blast furnace metallurgical technology, specifically to an intelligent control device and method for adjusting oxygen enrichment in a blast furnace. Background Technology

[0002] Blast furnace ironmaking is the main method of modern ironmaking, boasting excellent technical and economic indicators, simple processes, high production volume, and high labor productivity. Iron produced using this method accounts for over 95% of the world's total iron production. Oxygen enrichment in blast furnaces can increase output, raise the theoretical combustion temperature before the tuyeres, increase the pulverized coal injection ratio, and reduce pollutant emissions during production, resulting in significant economic benefits. It is a widely adopted technology in the ironmaking industry both domestically and internationally. Therefore, fluctuations in blast furnace oxygen enrichment greatly affect normal blast furnace production. Currently, adjustments to blast furnace oxygen enrichment are mainly made manually based on experience. This method has several drawbacks in actual production: firstly, there are no unified technical standards for oxygen enrichment adjustments; secondly, the timing of manual adjustments is difficult to determine; and thirdly, this adjustment method has poor timeliness, significantly impacting the stability of blast furnace oxygen enrichment.

[0003] Chinese patent application CN201410368698.2, entitled "A Fully Intelligent Adjustment Method for Oxygen Enrichment in a Blast Furnace," describes a method that installs pressure regulating valves, shut-off valves, and flow regulating valves on the oxygen enrichment injection pipeline of a blast furnace. These valves are connected to a computer, and the computer automatically adjusts them to complete the oxygen enrichment operation, achieving automated adjustment of blast furnace oxygen enrichment without resonance issues. However, this patented method installs valves on the same pipeline without branch pipes. This can easily lead to oxygen shortage in the blast furnace if oxygen enrichment fluctuations exceed limits or if any valve is damaged. Furthermore, this adjustment method does not quantify the relationship between valve opening and flow rate; it only calibrates the flow rate by adjusting the valve opening, resulting in insufficient accuracy. Summary of the Invention

[0004] The purpose of this invention is to provide an intelligent control device and method for adjusting oxygen enrichment in blast furnaces. Compared with existing manual oxygen enrichment adjustments, it has a unified adjustment technical standard, timely and accurate adjustments, ensuring safe and efficient blast furnace production, realizing quantitative control of oxygen enrichment in blast furnaces, reducing production costs, and minimizing resource waste, thereby solving the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: an intelligent control device for adjusting oxygen enrichment in a blast furnace, comprising, in sequence, an outlet pressure gauge C, a branch pipe oxygen enrichment flow meter, a pressure gauge B, a pressure gauge A, and an oxygen enrichment main pipe pressure gauge installed on the blast furnace oxygen enrichment main pipe; an oxygen enrichment shut-off valve is provided between the outlet pressure gauge C and the branch pipe oxygen enrichment flow meter; a branch pipe valve is provided between the branch pipe oxygen enrichment flow meter and pressure gauge B; and a pressure regulating valve B is provided between pressure gauge B and pressure gauge A. A pressure regulating valve A is installed between pressure gauge A and the pressure gauge of the oxygen-enriched main pipe; a small branch pipe is also connected to the oxygen-enriched main pipe of the blast furnace, and a small branch pipe valve and a small branch pipe oxygen-enriched flow meter are installed on the small branch pipe; the outlet pressure gauge C, the large branch pipe oxygen-enriched flow meter, pressure gauge B, pressure gauge A, the oxygen-enriched main pipe pressure gauge, the oxygen-enriched shut-off valve, the large branch pipe valve, the pressure regulating valve B, the pressure regulating valve A, the small branch pipe valve, and the small branch pipe oxygen-enriched flow meter are all controlled by an external computer CRT control system and display.

[0006] This invention provides another technical solution: an intelligent control method for blast furnace oxygen enrichment adjustment, based on an intelligent control device for blast furnace oxygen enrichment adjustment, comprising the following steps:

[0007] S1: Start the computer CRT control system and display, and set the required oxygen enrichment flow rate V of the blast furnace as the reference value;

[0008] S2: The flow data read from the oxygen-enriched flow meter of the large branch pipe and the oxygen-enriched flow meter of the small branch pipe are V1 and V2 respectively. The relative error of the oxygen-enriched flow is calculated as δV=|(V1+V2)-V| / V×100%.

[0009] S3: Determine the oxygen enrichment adjustment rate T, the specific method is as follows:

[0010] a) When the relative error of the oxygen-enriched flow rate |δV|∈(0, 2.5%), the oxygen-enriched flow rate is determined to be within normal fluctuations and no adjustment is made. The openings K0 and K1 of pressure regulating valves A and B, and the valve openings K2 and K3 of the large and small branch pipe valves are maintained. The oxygen-enriched flow rate setting T is determined to be 0m. 3 / hs;

[0011] b) When the relative error of the oxygen-enriched flow rate |δV|∈(2.5%, 5.0%), it is determined that the oxygen-enriched flow rate is a small fluctuation. The openings K0 and K1 of pressure regulating valves A and B, and the valve opening K2 of the large branch valve are maintained, while the valve opening of the small branch valve is (K3±10%). The oxygen-enriched adjustment setpoint T is determined to be ±20m. 3 / hs, when the regression |δV|∈(0, 2.5%), maintain the valve opening of the small branch valve and determine the adjustment rate T as 0m. 3 / hs;

[0012] c) When the relative error of the oxygen-enriched flow rate |δV| ∈ (5.0%, 10.0%), it is determined that the oxygen-enriched flow rate is fluctuating significantly. The opening degree K1 of pressure regulating valve A and the valve opening degree K3 of the large branch valve are maintained, the valve opening degree of the small branch valve is (K3 ± 10%), and the opening degree of pressure regulating valve B is (K1 ± 10%). The oxygen-enriched adjustment setting adjustment rate T is determined to be ±50m. 3 When the regression δV∈(2.5%, 5.0%), the opening degree of the backoff pressure regulating valve B is K1, and the oxygen enrichment adjustment setting adjustment rate T is determined to be ±20m. 3 When the regression δV∈(0, 2.5%), maintain the opening of the small branch valve and the pressure regulating valve B, and determine the adjustment rate T as 0m. 3 / hs;

[0013] d) When the blast furnace needs to significantly increase or decrease oxygen according to smelting requirements, if the relative error of the oxygen enrichment flow rate is |δV|∈(10.0%, 100%), it is determined that the oxygen enrichment flow rate is abnormally fluctuating. Switch to the "PLC manual" oxygen enrichment adjustment mode and remind the user to intervene manually.

[0014] Furthermore, the specific control method in S3 during the oxygen-enriched flow adjustment phase is as follows:

[0015] S301: When △|T-T1|∈(0,10m) 3 When / hs], the openings K0 and K1 of pressure regulating valve A and pressure regulating valve B, as well as the openings K2 and K3 of the large branch valve and small branch valve, remain unchanged and are not adjusted.

[0016] S302: When △|T-T1|∈(10m) 3 / hs,20m 3 When / hs], maintain the opening K0 of pressure regulating valve A and the openings K2 and K3 of the large and small branch valves. Adjust the opening K1 of pressure regulating valve B by ±5%, and observe whether the relative error of oxygen enrichment flow rate returns to △|T-T1|∈(0,10m 3 If not, continue adjusting, with each valve opening change being ±5%K1 and an adjustment interval of 10 seconds;

[0017] S303: When △|T-T1|∈(20m) 3 / hs,40m 3 When / hs], the opening K0 of pressure regulating valve A and the openings K2 and K3 of the large and small branch valves are maintained. The opening K1 of pressure regulating valve B is adjusted by ±10%. It is observed whether the relative error of the oxygen-enriched flow rate returns to △|T-T1|∈(0,10m). 3If not, continue adjusting, with each valve opening change being ±10% and an interval of 5 seconds;

[0018] S304: When △|T-T1|∈(40m) 3 When the duration reaches 10 hours ( / hs, +∞), it is determined to be an adjustment abnormality. The system will switch to "PLC Manual" oxygen enrichment adjustment mode, and the computer CRT control system and display will issue an alarm to remind manual intervention.

[0019] Furthermore, when the value P of the outlet pressure gauge C is detected, the oxygen-enriched shut-off valve is in the open state, and the flow values ​​V1 and V2 of the oxygen-enriched flow meters of the large and small branches of the oxygen-enriched pipeline are displayed, the computer CRT control system and display identify that the blast furnace is in an oxygen-enriched state and select the "PLC automatic" oxygen-enriched adjustment mode.

[0020] Furthermore, when the oxygen-enriched shut-off valve is detected to be closed, the pressure value of the pressure gauge C at the outlet of the oxygen-enriched main pipe is 0. The computer CRT control system and display recognize that the blast furnace is in a non-oxygen-enriched state, and thus automatically select the "PLC standby" state.

[0021] Furthermore, the calculation and adjustment rate determination of the correspondence between the opening degrees K0 and K1 of actual pressure regulating valve A and pressure regulating valve B, and the valve opening degrees K2 and K3 of large branch pipe valves and small branch pipe valves and flow rate values ​​are implemented by the application server and displayed on the monitor.

[0022] Furthermore, the valve opening adjustments of pressure regulating valve A, pressure regulating valve B, large branch valve, and small branch valve are all implemented by the controller based on the application server and displayed on the monitor.

[0023] Furthermore, the oxygen-enriched manifold pressure gauge is used to monitor fluctuations in external pressure.

[0024] Compared with the prior art, the beneficial effects of the present invention are:

[0025] The intelligent control device and method for blast furnace oxygen enrichment adjustment of the present invention has a unified adjustment technical standard compared with the existing manual oxygen enrichment adjustment. The adjustment is timely and accurate, ensuring safe and efficient blast furnace production. It achieves quantitative control of blast furnace oxygen enrichment, reduces production costs, and minimizes resource waste. Specifically, the oxygen enrichment pipeline is equipped with branch pipes to prevent oxygen outages in the blast furnace when oxygen enrichment fluctuations exceed limits or valves are damaged. The present invention can also quantify the relationship between valve opening and flow rate, achieving higher accuracy. When the "PLC automatic" oxygen enrichment adjustment mode malfunctions, the CRT control system will issue a fault alarm, reminding manual intervention to switch to the "PLC manual" oxygen enrichment adjustment mode and promptly investigate the cause. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the device connection for the intelligent control device of the present invention;

[0027] Figure 2 This is a flowchart of the control method according to an embodiment of the present invention.

[0028] In the diagram: 1. Outlet pressure gauge C; 2. Oxygen-enriched shut-off valve; 3. Main branch pipe oxygen-enriched flow meter; 4. Main branch pipe valve; 5. Pressure gauge B; 6. Pressure regulating valve B; 7. Pressure gauge A; 8. Pressure regulating valve A; 9. Main oxygen-enriched pipe pressure gauge; 10. Small branch pipe oxygen-enriched flow meter; 11. Small branch pipe valve; 12. Computer CRT control system and display. Detailed Implementation

[0029] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0030] Please see Figure 1-2 This invention provides an intelligent control device for adjusting oxygen enrichment in a blast furnace, comprising a station pressure gauge C1, a branch pipe oxygen enrichment flow meter 3, a pressure gauge B5, a pressure gauge A7, and a main oxygen enrichment pipe pressure gauge 9, sequentially installed on the blast furnace oxygen enrichment main pipe. An oxygen enrichment shut-off valve 2 is provided between the station pressure gauge C1 and the branch pipe oxygen enrichment flow meter 3; a branch pipe valve 4 is provided between the branch pipe oxygen enrichment flow meter 3 and the pressure gauge B5; a pressure regulating valve B6 is provided between the pressure gauge B5 and the pressure gauge A7; and a pressure regulating valve B6 is provided between the pressure gauge A7 and the main oxygen enrichment pipe pressure gauge 9. A pressure regulating valve A8 is installed between the pressure gauges 9 and the main oxygen-enriched pipe of the blast furnace; a small branch pipe is also connected to the main oxygen-enriched pipe, and a small branch pipe valve 11 and a small branch pipe oxygen-enriched flow meter 10 are installed on the small branch pipe; the outlet pressure gauge C1, the main branch pipe oxygen-enriched flow meter 3, the pressure gauge B5, the pressure gauge A7, the main oxygen-enriched pipe pressure gauge 9, the oxygen-enriched shut-off valve 2, the main branch pipe valve 4, the pressure regulating valve B6, the pressure regulating valve A8, the small branch pipe valve 11, and the small branch pipe oxygen-enriched flow meter 10 are all controlled by an external computer CRT control system and a display 12.

[0031] Based on the intelligent control device for blast furnace oxygen enrichment adjustment provided in the above embodiments, to further explain the present invention, an intelligent control method for blast furnace oxygen enrichment adjustment is also provided. This method involves collecting data such as the outlet pressure of the blast furnace oxygen enrichment main pipe, the flow rate of the large and small oxygen enrichment branches, pressure gauge readings, the pressure value of the oxygen enrichment main pipe, and the status of the oxygen enrichment valves. It then calculates the oxygen enrichment flow rate value corresponding to the actual opening degree of each valve and its relative error. After analysis and evaluation, the oxygen enrichment of the blast furnace is adjusted in real time. The specific steps are as follows:

[0032] S1: Start the computer CRT control system and display 12, and set the required oxygen enrichment flow rate V of the blast furnace as the reference value.

[0033] S2: Read the flow data V1 and V2 from the oxygen-enriched flow meter 3 in the large branch pipe and the oxygen-enriched flow meter 10 in the small branch pipe, respectively. Calculate the relative error of the oxygen-enriched flow rate as δV=|(V1+V2)-V| / V×100%.

[0034] S3: Determine the oxygen enrichment adjustment rate T, the specific method is as follows:

[0035] a) When the relative error of the oxygen-enriched flow rate |δV|∈(0, 2.5%), it is determined that the oxygen-enriched flow rate is within the normal fluctuation range and no adjustment is made. The openings K0 and K1 of pressure regulating valves A8 and B6, and the valve openings K2 and K3 of large branch valve 4 and small branch valve 11 are maintained. The oxygen-enriched adjustment setting adjustment rate T is determined to be 0m. 3 / hs;

[0036] b) When the relative error of the oxygen-enriched flow rate |δV| ∈ (2.5%, 5.0%), it is determined that the oxygen-enriched flow rate is a small fluctuation. The openings K0 and K1 of pressure regulating valves A8 and B6, and the valve opening K2 of the large branch valve 4 are maintained, while the valve opening of the small branch valve 11 is (K3 ± 10%). The oxygen-enriched adjustment setpoint T is determined to be ±20m. 3 When the regression |δV|∈(0, 2.5%), maintain the valve opening of the small branch valve 11 and determine the adjustment rate T as 0m. 3 / hs;

[0037] c) When the relative error of the oxygen-enriched flow rate |δV|∈(5.0%, 10.0%), it is determined that the oxygen-enriched flow rate is fluctuating significantly. The opening degree K1 of pressure regulating valve A8 and the valve opening degree K3 of large branch valve 4 are maintained, the valve opening degree of small branch valve 11 is (K3±10%), and the opening degree of pressure regulating valve B6 is (K1±10%). The oxygen-enriched adjustment setting adjustment rate T is determined to be ±50m. 3 When the regression δV∈(2.5%, 5.0%), the opening degree of the backoff pressure regulating valve B6 is K1, and the oxygen enrichment adjustment setting adjustment rate T is determined to be ±20m. 3 / hs, when regression δV∈(0, 2.5%), maintain the opening of the small branch valve 11 and the pressure regulating valve B6, and determine the adjustment rate T as 0m. 3 / hs;

[0038] d) When the blast furnace needs to significantly increase or decrease oxygen according to smelting requirements, if the relative error of the oxygen enrichment flow rate is |δV|∈(10.0%, 100%), it is determined that the oxygen enrichment flow rate is abnormally fluctuating. Switch to the "PLC manual" oxygen enrichment adjustment mode and remind the user to intervene manually.

[0039] The specific control method in S3 during the oxygen-enriched flow adjustment phase is as follows:

[0040] S301: When △|T-T1|∈(0,10m) 3 When / hs], the openings K0 and K1 of pressure regulating valve A8 and pressure regulating valve B6, and the openings K2 and K3 of large branch valve 4 and small branch valve 11 are maintained and not adjusted;

[0041] S302: When △|T-T1|∈(10m) 3 / hs,20m 3 When / hs], maintain the opening K0 of pressure regulating valve A8 and the valve openings K2 and K3 of large branch valve 4 and small branch valve 11. Adjust the opening K1 of pressure regulating valve B6 by ±5%, and observe whether the relative error of oxygen enrichment flow rate returns to △|T-T1|∈(0,10m 3 If not, continue adjusting, with each valve opening change being ±5% and an adjustment interval of 10 seconds;

[0042] S303: When △|T-T1|∈(20m) 3 / hs,40m 3 When / hs], maintain the opening K0 of pressure regulating valve A8 and the valve openings K2 and K3 of large branch valve 4 and small branch valve 11. Adjust the opening K1 of pressure regulating valve B6 by ±10%, and observe whether the relative error of oxygen enrichment flow rate returns to △|T-T1|∈(0,10m 3 If not, continue adjusting, with each valve opening change being ±10% and an interval of 5 seconds;

[0043] S304: When △|T-T1|∈(40m) 3 When the duration reaches 10 hours ( / hs, +∞), it is determined to be an adjustment abnormality. The system will switch to the "PLC manual" oxygen enrichment adjustment mode, and the computer CRT control system and display 12 will issue an alarm to remind manual intervention.

[0044] In the above embodiment, when the value P of the outlet pressure gauge C1 is detected, the oxygen-enriched shut-off valve 2 is in the open state, and the flow values ​​V1 and V2 of the oxygen-enriched flow meter 3 of the large branch pipe and the oxygen-enriched flow meter 10 of the small branch pipe are detected, the computer CRT control system and display 12 recognize that the blast furnace is in an oxygen-enriched state and select the "PLC automatic" oxygen-enriched adjustment mode; when the oxygen-enriched shut-off valve 2 is detected to be in the closed state, the pressure value of the outlet pressure gauge C1 of the oxygen-enriched main pipe is 0, the computer CRT control system and display 12 recognize that the blast furnace is in a non-oxygen-enriched state, and thus automatically select the "PLC standby" state.

[0045] In the above embodiments, the calculation and determination of the correspondence between the opening degrees K0 and K1 of the actual pressure regulating valves A8 and B6, and the valve opening degrees K2 and K3 of the large branch valve 4 and the small branch valve 11 and the flow rate values ​​are implemented by the application server and displayed on the monitor. Specifically, the adjustment of the valve opening degrees of the pressure regulating valves A8 and B6, and the large branch valve 4 and the small branch valve 11 are all implemented by the controller based on the application server and displayed on the monitor. When the blast furnace significantly increases or decreases oxygen according to smelting needs, the computer CRT control system and the monitor 12 will issue an alarm to remind manual intervention and switch to the "PLC manual" oxygen enrichment adjustment mode.

[0046] In this embodiment of the invention, the pressure gauge 9 of the oxygen-enriched main pipe is used to monitor fluctuations in external pressure. Two pressure regulating valves are set to reduce the impact of abnormal pressure fluctuations in the oxygen-enriched main pipe. The pipeline pressure is maintained within a safe range through two pressure reductions. The pressure regulating valve A8 is set to manual mode with a fixed opening of 50%. Daily adjustments are made through the pressure regulating valve B6. Flow meters for the large and small oxygen-enriched branches are set. The flow meter 3 of the large branch has a large range, and the opening of the valve 4 of the large branch is fixed at 30-50%. The flow meter 10 of the small branch has a small range and high sensitivity. The flow rate is adjusted daily by adjusting the opening of the valve 11 of the small branch. The reference value of the total oxygen-enriched flow rate V of the blast furnace is set through an application server and displayed on a computer monitor.

[0047] To further illustrate this invention, the following specific application example is provided: Taking a blast furnace in the North District of Maanshan Iron and Steel Plant as an example, the oxygen enrichment rate is generally around 4.0%, and the oxygen enrichment capacity is 20,000 m³ / h. 3 / h.

[0048] Example 1:

[0049] The working position and method of the corresponding components involved in this embodiment 1 are as follows: Figure 1-2 As shown, the specific steps include:

[0050] 1. Start the computer CRT control system and monitor 12, and set the required oxygen enrichment flow rate for the blast furnace to 20,000 m³ / h.3 / h is used as the baseline value.

[0051] 2. Check that the opening degrees of pressure regulating valve A8 and pressure regulating valve B6 are 50% and 40% respectively, and the opening degrees of large branch valve 4 and small branch valve 11 are 40% and 40% respectively.

[0052] 3. Read the flow data from oxygen enrichment flow meter 3 in the main branch pipe and oxygen enrichment flow meter 10 in the small branch pipe, both showing a flow rate of 4000 m³ / h. 3 / h, 14000m 3 / h, according to the formula δV=|(V1+V2)-V| / V×100%, the relative error δV of the oxygen-enriched flow rate is calculated to be 10.0%, and it is determined that |δV|∈(5.0%, 10.0%), and the oxygen-enriched flow rate is in a large fluctuation.

[0053] 4. Based on the judgment result in step 3, maintain the opening of pressure regulating valve A8 at 50% and the opening of main branch valve 4 at 40%, adjust the opening of main branch valve 11 to 50%, adjust the opening of pressure regulating valve B6 to 45%, and set the oxygen enrichment adjustment rate T to ±50m. 3 When the relative error of the oxygen-enriched flow rate regresses to δV∈(2.5%, 5.0%), the opening of the backoff pressure regulating valve B6 is 40%, and the oxygen-enriched adjustment setting adjustment rate T is determined to be ±20m. 3 / hs, when regression δV∈(0, 2.5%), maintain the opening of small branch valve 11 and pressure regulating valve B6, with an adjustment rate T of 0m. 3 / hs.

[0054] 5. Control during the oxygen-enriched flow rate adjustment phase:

[0055] 1) When △|T-T1|∈(0,10m) 3 When / hs], the openings of pressure regulating valves A8 and B6 are maintained at 50% and 40% respectively, and the openings of large branch valve 4 and small branch valve 11 are maintained at 40% and 40% respectively, without adjustment.

[0056] 2) When △|T-T1|∈(10m) 3 / hs,20m 3 When / hs], the opening of pressure regulating valve A8 is maintained at 50%, and the openings of large branch valve 4 and small branch valve 11 are maintained at 40% and 40% respectively. The opening of pressure regulating valve B6 is increased to 45%. Does the relative error of the oxygen-enriched flow rate revert to △|T-T1|∈(0,10m)? 3 If not, continue adjusting, with each valve opening change being ±5% and an adjustment interval of 10 seconds.

[0057] 3) When △|T-T1|∈(20m) 3 / hs,40m 3 When [hs], the opening of pressure regulating valve A8 is maintained at 50%, and the openings of large branch valve 4 and small branch valve 11 are maintained at 40% and 40% respectively. The opening of pressure regulating valve B6 is increased to 50%. Does the relative error of the oxygen-enriched flow rate revert to △|T-T1|∈(0,10m)? 3 If not, continue adjusting, with each valve opening change being ±10% and an interval of 5 seconds.

[0058] 4) When △|T-T1|∈(40m) 3 When the duration of / hs,+∞) reaches 10s, it is determined to be an adjustment abnormality. It will switch to the "PLC manual" oxygen enrichment adjustment mode. The computer CRT control system and display 12 will issue an alarm to remind manual intervention.

[0059] Example 2:

[0060] The intelligent control method for adjusting oxygen enrichment in a blast furnace in Embodiment 2 has the same basic structure as in Embodiment 1, but the difference is:

[0061] 1. According to the test results, the flow data V1 and V2 of the oxygen-enriched flow meter 3 in the large branch pipe and the oxygen-enriched flow meter 10 in the small branch pipe are 5000 m³ / h and 5000 m³ / h, respectively. 3 / h, 14000m 3 The relative error δV of the oxygen-enriched flow rate was calculated to be 5.0% per hour. It was determined that |δV|∈(2.5%, 5.0%), indicating that the oxygen-enriched flow rate was subject to slight fluctuations.

[0062] 2. Based on the judgment result in 1, the openings of pressure regulating valves A8 and B6 are maintained at 50% and 40% respectively, and the opening of main branch valve 4 is maintained at 40%. The opening of main branch valve 11 is adjusted to 50%, and the oxygen enrichment adjustment setpoint T is set to ±20m. 3 / hs, when the regression |δV|∈(0, 2.5%), maintain the opening of the small branch valve 11, and adjust the rate T to 0m. 3 / hs.

[0063] 3. The control of the oxygen-enriched flow rate adjustment stage is the same as in Example 1.

[0064] Example 3:

[0065] The intelligent control method for adjusting oxygen enrichment in a blast furnace in Embodiment 3 has the same basic structure as in Embodiment 1, but the difference is:

[0066] 1. According to the test results, the flow data V1 and V2 of the oxygen-enriched flow meter 3 in the large branch pipe and the oxygen-enriched flow meter 10 in the small branch pipe are 5500 m³ / h and 5500 m³ / h, respectively. 3 / h, 14000m 3The relative error δV of the oxygen-enriched flow rate was calculated to be 2.5% per hour. It was determined that |δV|∈(0, 2.5%), and the oxygen-enriched flow rate was within the normal fluctuation range.

[0067] 2. When the relative error of the oxygen-enriched flow rate |δV|∈(0, 2.5%), the oxygen-enriched flow rate is considered to be within normal fluctuations and no adjustment is made. The openings of pressure regulating valves A8 and B6 are maintained at 50% and 40%, respectively, and the openings of large branch valve 4 and small branch valve 11 are maintained at 40% and 40%, respectively. The oxygen-enriched flow rate adjustment setting T is 0m. 3 / hs.

[0068] 3. The control of the oxygen-enriched flow rate adjustment stage is the same as in Example 1.

[0069] Example 4:

[0070] This embodiment 4 presents an intelligent control method for adjusting oxygen enrichment in a blast furnace. The basic structure is the same as that in embodiment 1, except that when the blast furnace significantly increases or decreases oxygen according to smelting needs, the relative error of the oxygen enrichment flow rate |δV|∈(10.0%, 100%) indicates that the oxygen enrichment flow rate is fluctuating abnormally. The system then switches to the "PLC manual" oxygen enrichment adjustment mode and prompts for manual intervention.

[0071] The present invention and its embodiments have been described above illustratively. This description is not restrictive, and the figures shown are only one embodiment of the present invention; the actual structure is not limited thereto. Therefore, if those skilled in the art are inspired by this description and design similar structures and embodiments without departing from the spirit of the present invention, such designs should fall within the protection scope of the present invention.

Claims

1. An intelligent control method for blast furnace oxygen enrichment adjustment, implemented based on an intelligent control device for blast furnace oxygen enrichment adjustment, characterized in that: The device includes a station pressure gauge C (1), a branch pipe oxygen enrichment flow meter (3), a pressure gauge B (5), a pressure gauge A (7), and an oxygen enrichment main pipe pressure gauge (9) installed sequentially on the blast furnace oxygen enrichment main pipe. An oxygen enrichment shut-off valve (2) is installed between the station pressure gauge C (1) and the branch pipe oxygen enrichment flow meter (3) on the blast furnace oxygen enrichment main pipe. A branch pipe valve (4) is installed between the branch pipe oxygen enrichment flow meter (3) and the pressure gauge B (5). A pressure regulating valve B (6) is installed between the pressure gauge B (5) and the pressure gauge A (7). A pressure regulating valve is installed between the pressure gauge A (7) and the oxygen enrichment main pipe pressure gauge (9). Door A (8); The main oxygen-enriched pipe of the blast furnace is also connected to a small branch pipe, and a small branch pipe valve (11) and a small branch pipe oxygen-enriched flow meter (10) are installed on the small branch pipe; The outlet pressure gauge C (1), the main branch pipe oxygen-enriched flow meter (3), the pressure gauge B (5), the pressure gauge A (7), the main oxygen-enriched pipe pressure gauge (9), the oxygen-enriched shut-off valve (2), the main branch pipe valve (4), the pressure regulating valve B (6), the pressure regulating valve A (8), the small branch pipe valve (11), and the small branch pipe oxygen-enriched flow meter (10) are all controlled by an external computer CRT control system and a display (12), using the following steps: S1: Start the computer CRT control system and display (12), and set the required oxygen enrichment flow rate V of the blast furnace as the reference value; S2: The flow data read from the oxygen-enriched flow meter (3) of the large branch pipe and the oxygen-enriched flow meter (10) of the small branch pipe are V1 and V2 respectively. The relative error of the oxygen-enriched flow is calculated as δV=|(V1+V2)-V| / V×100%; S3: Determine the oxygen enrichment adjustment rate T, the specific method is as follows: a) When the relative error of the oxygen-enriched flow rate |δV|∈(0, 2.5%), it is determined that the oxygen-enriched flow rate is within the normal fluctuation range and no adjustment is made. The openings K0 and K1 of pressure regulating valve A (8) and pressure regulating valve B (6), and the valve openings K2 and K3 of large branch valve (4) and small branch valve (11) are maintained. The oxygen-enriched adjustment setting adjustment rate T is determined to be 0m. 3 / hs; b) When the relative error of the oxygen-enriched flow rate |δV|∈(2.5%, 5.0%), it is determined that the oxygen-enriched flow rate is a small fluctuation. The openings K0 and K1 of pressure regulating valve A (8) and pressure regulating valve B (6) and the valve opening K2 of the large branch valve (4) are maintained, and the valve opening of the small branch valve (11) is (K3±10%). The oxygen-enriched adjustment setting rate T is determined to be ±20m. 3 / hs, when the regression |δV|∈(0, 2.5%), maintain the valve opening of the small branch valve (11) and determine the adjustment rate T as 0m. 3 / hs; c) When the relative error of the oxygen-enriched flow rate |δV|∈(5.0%, 10.0%), it is determined that the oxygen-enriched flow rate is in a large fluctuation. The opening degree K1 of the pressure regulating valve A (8) and the valve opening degree K3 of the large branch valve (4) are maintained, the valve opening degree of the small branch valve (11) is (K3±10%), and the opening degree of the pressure regulating valve B (6) is (K1±10%). The oxygen-enriched adjustment setting adjustment rate T is determined to be ±50m. 3 / hs, when the regression δV∈(2.5%, 5.0%], the opening degree of the backoff pressure regulating valve B(6) is K1, and the oxygen enrichment adjustment setting adjustment rate T is determined to be ±20m 3 / hs, when the regression δV∈(0,2.5%), maintain the opening of the small branch valve (11) and the pressure regulating valve B (6), and determine the adjustment rate T as 0m 3 / hs; d) When the blast furnace needs to significantly increase or decrease oxygen according to smelting requirements, if the relative error of the oxygen enrichment flow rate is |δV|∈(10.0%, 100%), it is determined that the oxygen enrichment flow rate is abnormally fluctuating. The system will switch to the PLC manual oxygen enrichment adjustment mode and prompt manual intervention.

2. The intelligent control method for adjusting oxygen enrichment in a blast furnace according to claim 1, characterized in that: The specific control method for adjusting the oxygen-enriched flow rate in S3 is as follows: S301: When △|T-T1|∈(0,10m) 3 When / hs], the openings K0 and K1 of pressure regulating valve A (8) and pressure regulating valve B (6), as well as the valve openings K2 and K3 of large branch valve (4) and small branch valve (11), are maintained and not adjusted; S302: When △|T-T1|∈(10m) 3 / hs,20 m 3 When / hs], the opening K0 of pressure regulating valve A (8) and the valve openings K2 and K3 of large branch valve (4) and small branch valve (11) are maintained. The opening K1 of pressure regulating valve B (6) is adjusted by ±5%. It is observed whether the relative error of oxygen enrichment flow rate returns to △|T-T1|∈(0,10 m 3 If not, continue adjusting, with each valve opening change being ±5% and an adjustment interval of 10 seconds; S303: When △|T-T1|∈(20m) 3 / hs, 40 m 3 When / hs], the opening K0 of pressure regulating valve A (8) and the valve openings K2 and K3 of large branch valve (4) and small branch valve (11) are maintained. The opening K1 of pressure regulating valve B (6) is adjusted by ±10%. It is observed whether the relative error of oxygen enrichment flow rate returns to △|T-T1|∈(0,10 m 3 If not, continue adjusting, with each valve opening change being ±10% and an interval of 5 seconds; S304: When △|T-T1|∈(40m) 3 When the duration reaches 10h.s, the adjustment is deemed abnormal. The system switches to PLC manual oxygen enrichment adjustment mode. The computer CRT control system and display (12) issue an alarm to remind manual intervention.

3. The intelligent control method for adjusting oxygen enrichment in a blast furnace according to claim 2, characterized in that: When the value P of the outlet pressure gauge C (1) is detected, the oxygen-enriched shut-off valve (2) is in the open state, and the flow values ​​V1 and V2 of the oxygen-enriched flow meter (3) of the large branch pipe and the oxygen-enriched flow meter (10) of the small branch pipe are displayed. The computer CRT control system and display (12) identify that the blast furnace is in an oxygen-enriched state and select the PLC automatic oxygen-enriched adjustment mode.

4. The intelligent control method for adjusting oxygen enrichment in a blast furnace according to claim 2, characterized in that: When the oxygen-enriched shut-off valve (2) is detected to be closed, the pressure value of the oxygen-enriched main outlet pressure gauge C (1) is 0. The computer CRT control system and display (12) recognize that the blast furnace is in a non-oxygen-enriched state, and thus automatically select the PLC standby state.

5. The intelligent control method for adjusting oxygen enrichment in a blast furnace according to claim 2, characterized in that: The calculation and adjustment rate determination of the correspondence between the opening degrees K0 and K1 of the actual pressure regulating valve A (8) and pressure regulating valve B (6) and the valve opening degrees K2 and K3 of the large branch valve (4) and small branch valve (11) and the flow rate values ​​are implemented by the application server and displayed on the monitor.

6. The intelligent control method for adjusting oxygen enrichment in a blast furnace according to claim 5, characterized in that: The valve opening of pressure regulating valve A (8), pressure regulating valve B (6), large branch valve (4), and small branch valve (11) is adjusted by the controller based on the application server and displayed on the monitor.

7. The intelligent control method for adjusting oxygen enrichment in a blast furnace according to claim 1, characterized in that: The oxygen-enriched main pipe pressure gauge (9) is used to monitor fluctuations in external pressure.

Images