Dust removal system control method based on L1 and L3 production plans

Abstract

The invention relates to a dust removal system control method based on L1 and L3 production plans. The dust removal system control method comprises the steps of data statistics, data set establishment, dust removal priority rule setting and the like. According to the dust removal system control method based on the L1 and L3 production plans, the control logic is re-planned according to the characteristics of eight dust removal points, the fan speed waiting time is fully utilized, and the fan utilization rate is increased.

Description

Technical Field

[0001] This invention relates to a dust removal system control method based on L1 and L3 production plans, belonging to the field of dust removal technology. Background Technology

[0002] The continuous casting dust collection system in a steel plant has eight dust collection points: continuous casting manual cleaning, No. 3 ladle dust collection, No. 4 ladle dust collection, No. 2 steelmaking slag turning, No. 3 hot repair, No. 4 hot repair, No. 5 hot repair, and continuous casting tundish unloading. The dust generation time at each workstation is discontinuous. The continuous casting manual cleaning has a continuous dust generation time exceeding 2 hours, while the continuous dust generation time at the other workstations is less than 15 minutes. The current control logic is as follows: before each work system starts generating dust, the corresponding dust collection valve is opened; after dust generation ends, the dust collection valve is closed. The dust collector fan's speed is dynamically adjusted based on the sum of the openings of all valves. When all dust-generating valves are closed or only one dust-generating valve is open, the dust collector fan is in standby mode with a minimum speed of 400 rpm. A problem exists in actual operation: when there are multiple dust-generating workstations simultaneously (more than 4), even with the fan speed at maximum, there is a risk of decreased dust collection efficiency. For a significant portion of the day, the dust collector fan operates at its lowest speed, resulting in low utilization. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to overcome the shortcomings of the above-mentioned technologies and provide a dust removal system control method that aims to reduce the high-speed running time of the fan, improve the dust removal effect, make full use of the fan's idle time, and improve the fan utilization rate.

[0004] To solve the above-mentioned technical problems, the technical solution proposed by this invention is: a dust removal system control method based on L1 and L3 production plans, comprising the following steps: Step 1: Calculate the continuous dust generation time, dust removal interval, and maximum allowable delay time for the 8 dust removal points in the dust removal system; define the 3 dust removal points with a maximum allowable delay time of 0 as critical dust removal points; define the first to the third dust removal points as the 3 critical dust removal points respectively; Step 2: Collect dust removal operation data from the L1 and L3 production plans and create an array A[i][j], where i=0,1,2,3,4,5,6,7; j=0,1,2,3; A[i][0] represents the remaining time for dust removal at the i-th dust removal point, A[i][1] represents the remaining time until the next dust removal operation at the i-th dust removal point, A[i][2] represents whether the i-th dust removal point is currently performing dust removal operations (1 for current operations, 0 for no current operations), and A[i][3] represents the time that the dust removal operation at the i-th dust removal point can be postponed. Step 3: Define N=A[0][2]+A[1][2]+A[2][2]+A[3][2]+A[4][2]+A[5][2]+ A[6][2]+A[7][2]; When N < 4, a new dust removal operation can be added; Let P=min{A[0][1], A[1][1], A[2][1], A[3][1]}; If P > A[4][1] + the continuous dust generation time of the fifth dust removal point, and A[4][2] = 0, then it means that the fifth dust removal point can start dust removal; If P > A[5][1] + the continuous dust generation time of the sixth dust removal point, and A[5][2] = 0, then it means that the sixth dust removal point can start dust removal; If P > A[6][1] + the continuous dust generation time of the seventh dust removal point, and A[6][2] = 0, then it means that the seventh dust removal point can start dust removal; If P > A[7][1] + the continuous dust generation time of the eighth dust removal point, and A[7][2] = 0, then it means that the eighth dust removal point can start dust removal.

[0005] A further improvement to the above scheme is that the maximum allowable delay time from the fifth to the eighth work point is higher than the maximum allowable delay time from the first to the third dust removal point.

[0006] A further improvement to the above scheme is that, in step 3, a maximum of four dust removal points are allowed to operate simultaneously.

[0007] A further improvement to the above scheme is that, in step 2, the data in array A[i][j] is updated every minute.

[0008] The dust removal system control method based on L1 and L3 production plans provided by this invention redesigns the control logic according to the characteristics of the eight dust removal points, making full use of the fan idle time and improving the fan utilization rate. Attached Figure Description

[0009] Figure 1 This is a schematic diagram of an application scenario of a preferred embodiment of the present invention. Detailed Implementation

[0010] Example: The dust removal system control method based on L1 and L3 production plans in this example includes the following steps: Step 1: Calculate the continuous dust generation time, dust removal interval, and maximum allowable delay time for the 8 dust removal points in the dust removal system; define the 3 dust removal points with a maximum allowable delay time of 0 as critical dust removal points; define the first to the third dust removal points as the 3 critical dust removal points respectively; Step 2: Collect dust removal operation data from the L1 and L3 production plans and create an array A[i][j], where i=0,1,2,3,4,5,6,7; j=0,1,2,3; A[i][0] represents the remaining time for dust removal at the i-th dust removal point, A[i][1] represents the remaining time until the next dust removal operation at the i-th dust removal point, A[i][2] represents whether the i-th dust removal point is currently performing dust removal operations (1 for current operations, 0 for no current operations), and A[i][3] represents the time that the dust removal operation at the i-th dust removal point can be postponed. Step 3: Define N=A[0][2]+A[1][2]+A[2][2]+A[3][2]+A[4][2]+A[5][2]+ A[6][2]+A[7][2]; When N < 4, a new dust removal operation can be added; Let P=min{A[0][1], A[1][1], A[2][1], A[3][1]}; If P > A[4][1] + the continuous dust generation time of the fifth dust removal point, and A[4][2] = 0, then it means that the fifth dust removal point can start dust removal; If P > A[5][1] + the continuous dust generation time of the sixth dust removal point, and A[5][2] = 0, then it means that the sixth dust removal point can start dust removal; If P > A[6][1] + the continuous dust generation time of the seventh dust removal point, and A[6][2] = 0, then it means that the seventh dust removal point can start dust removal; If P > A[7][1] + the continuous dust generation time of the eighth dust removal point, and A[7][2] = 0, then it means that the eighth dust removal point can start dust removal.

[0011] Taking the dust removal system of a steel plant's continuous casting mill as an example, such as Figure 1 As shown, the continuous casting dust removal system has 8 dust removal points, namely, continuous casting manual cleaning, No. 3 ladle dust removal, No. 4 ladle dust removal, No. 2 steelmaking slag turning, No. 3 hot repair, No. 4 hot repair, No. 5 hot repair, and continuous casting tundish unloading.

[0012] The following table was obtained through statistical analysis: Work site One continuous dust generation time Dust removal interval Maximum allowed delay time Two consecutive castings 2 hours Approximately 30 minutes Within 1 hour Dust collector #3 5 minutes Approximately 30 minutes 0 minutes Dust collector #4 5 minutes Approximately 30 minutes 0 minutes Second Steelmaking Slag Turning 4 minutes Approximately 15 minutes 0 minutes 3# Hot Repair 10 minutes Approximately 45 minutes 10 minutes 4# Hot Repair 10 minutes Approximately 45 minutes 10 minutes 5# Hot Repair 10 minutes Approximately 45 minutes 10 minutes Unloading the tundish in the double casting process 8 minutes Approximately 4 hours 1 hour As shown in the table above, the dust removal of the ladle at Unit 3, the dust removal of the ladle at Unit 4, and the slag turning operation at the No. 2 steelmaking plant are critical operation points, and the operation time cannot be delayed.

[0013] The hot repairs of No. 3, No. 4, and No. 5, as well as the unloading of the tundish in the continuous casting machine, can be postponed. The maximum postponement time exceeds the dust generation time of the ladle dust removal of No. 3 and No. 4 machines, and the slag turning operation of the No. 2 steelmaking plant. Therefore, theoretically, any one of these four operations can avoid the conditions of operating simultaneously with the ladle dust removal of No. 3 and No. 4 machines, and the slag turning operation of the No. 2 steelmaking plant.

[0014] Due to the long continuous operation time of the manual cleaning process in the double casting workshop, although a relatively long delay time is allowed, the large number of workers involved means that stopping the operation would result in a waste of manpower, so delaying the operation is not considered at this time.

[0015] To ensure the dust removal efficiency of the continuous casting dust removal system, it is essential to guarantee that no more than four dust removal points can operate simultaneously. Therefore, the operation plans for dust removal at ladle #3 and #4, slag turning at the No.2 steelmaking plant, and manual cleaning at the No.2 steelmaking plant will be executed according to the production plan. Other operation arrangements will be optimized to meet the requirement that no more than four operation points in the system can operate simultaneously.

[0016] The model was established to output the optimal operation time for four work points: hot repair #3, hot repair #4, hot repair #5, and disassembly of the tundish in the continuous casting.

[0017] The start time of a given task and the start time of the next task are collected from the L3 production plan. The remaining time of a task and whether a task is currently in progress are collected from the L1 PLC. Both L1 and L3 times are based on Beijing time and are calibrated daily. The data update cycle is 1 minute.

[0018] For tasks that can be optimized, if the start time for the current task has arrived but dust removal conditions do not permit operation, the remaining time until the next task is counted as 0, and the task can be postponed for the maximum allowed time. Before the task is implemented, the allowable postponement time decreases continuously with the time progress, decreasing by 1 minute with each update. Once the task starts, the remaining time until the next task is calculated according to the L3 task schedule, and the task can be postponed for the maximum allowed time.

[0019] Create array A[8][4].

[0020] A[0][0] indicates the remaining time for the dust removal operation of machine #3, A[0][1] indicates the remaining time until the next dust removal operation of machine #3, A[0][2] indicates whether the dust removal operation of machine #3 is in progress (1 for in progress, 0 for not in progress), and A[0][3] indicates that the operation can be postponed.

[0021] A[1][0] indicates the remaining time for the dust removal operation of machine #4, A[1][1] indicates the remaining time before the next dust removal operation of machine #4, A[1][2] indicates whether the dust removal operation of machine #4 is in progress (1 indicates in progress, 0 indicates not in progress), and A[1][3] indicates that the operation can be postponed.

[0022] A[2][0] indicates the remaining time for the slag turning operation in the No. 2 steelmaking plant, A[2][1] indicates the remaining time until the next operation for the slag turning operation in the No. 2 steelmaking plant, A[2][2] indicates whether the slag turning operation in the No. 2 steelmaking plant is in progress (1 if in progress, 0 if not), and A[2][3] indicates that the operation can be postponed.

[0023] A[3][0] indicates the remaining time for the manual cleaning operation in the continuous casting process, A[3][1] indicates the remaining time until the next operation in the manual cleaning operation in the continuous casting process, A[3][2] indicates whether the manual cleaning operation in the continuous casting process is in progress (1 for in progress, 0 for no progress), and A[3][3] indicates that the operation can be postponed.

[0024] A[4][0] indicates the remaining time for hot repair work #3, A[4][1] indicates the remaining time until the next hot repair work #3, A[4][2] indicates whether hot repair work #3 is underway (1 for underway, 0 for not underway), and A[4][3] indicates that the work can be postponed.

[0025] A[5][0] indicates the remaining time for hot repair #4, A[5][1] indicates the remaining time until the next hot repair operation for #4, A[5][2] indicates whether hot repair #4 is currently underway (1 for current operation, 0 for no operation), and A[5][3] indicates that the operation can be postponed.

[0026] A[6][0] indicates the remaining time for hot repair work #5, A[6][1] indicates the remaining time until the next hot repair work #5, A[6][2] indicates whether hot repair work #5 is underway (1 for underway, 0 for not underway), and A[6][3] indicates that the work can be postponed.

[0027] A[7][0] indicates the remaining time for the tundish unpacking operation in the continuous casting process. A[7][1] indicates the remaining time before the next operation after the tundish unpacking operation in the continuous casting process. A[7][2] indicates whether the tundish unpacking operation in the continuous casting process is in progress. A[7][3] indicates that the operation can be postponed.

[0028] N=A[0][2]+A[1][2]+A[2][2]+A[3][2]+A[4][2]+A[5][2]+A[6][2]+A[7][2]; When N < 4, a new dust removal operation can be added.

[0029] P=min{A[0][1], A[1][1], A[2][1], A[3][1]}; If P>A[4][1]+10 and A[4][2]=0, then the hot repair work on #3 can begin.

[0030] If P>A[5][1]+10 and A[5][2]=0, then the hot repair work on #4 can begin.

[0031] If P>A[6][1]+10 and A[6][2]=0, then the hot repair work on #5 can begin.

[0032] If P>A[7][1]+8 and A[7][2]=0, it means that the unpacking operation of the ladle in the continuous casting can begin.

[0033] Summarize the projects that have been selected as eligible for work, and sort them by their deferral time, prioritizing the projects with the shortest deferral time.

[0034] By implementing the method of this embodiment, the problem of simultaneous operation of 5 or more dust removal points is solved, the risk of deterioration of dust removal effect (when 5 or more dust removal points are operating simultaneously) is mitigated, and the dust removal effect of the dust removal points under the jurisdiction of the system is guaranteed.

[0035] The original system had a minimum operating speed of 400 rpm and a maximum speed of 900 rpm (when 8 dust removal points were operating simultaneously). After the improvement, the system's minimum operating speed is 400 rpm and the maximum speed can be reduced to 720 rpm.

[0036] After the improvement, there were no more high-speed operations exceeding 720 rpm, and the operating time at 720 rpm increased by approximately 50 minutes per day compared to before the improvement. However, in terms of wind turbine motor energy consumption metering, the average power consumption of the wind turbine motor decreased by 5000 kWh per day.

[0037] This invention is not limited to the products described above. All technical solutions derived using equivalent substitutions fall within the scope of protection claimed by this invention.

Claims

1. A dust removal system control method based on L1 and L3 production plans, characterized in that, Includes the following steps: Step 1: Calculate the continuous dust generation time, dust removal interval, and maximum allowable delay time for the 8 dust removal points in the dust removal system; define the 3 dust removal points with a maximum allowable delay time of 0 as critical dust removal points; define the first to the third dust removal points as the 3 critical dust removal points respectively; Step 2: Collect dust removal operation data from the L1 and L3 production plans and create an array A[i][j], where i=0,1,2,3,4,5,6,7; j=0,1,2,3; A[i][0] represents the remaining time for dust removal at the i-th dust removal point, A[i][1] represents the remaining time until the next dust removal operation at the i-th dust removal point, A[i][2] represents whether the i-th dust removal point is currently performing dust removal operations (1 for current operations, 0 for no current operations), and A[i][3] represents the time that the dust removal operation at the i-th dust removal point can be postponed. Step 3: Define N=A[0][2]+A[1][2]+A[2][2]+A[3][2]+A[4][2]+A[5][2]+ A[6][2]+A[7][2]; When N < 4, a new dust removal operation can be added; Let P=min{A[0][1], A[1][1], A[2][1], A[3][1]}; If P > A[4][1] + the continuous dust generation time of the fifth dust removal point, and A[4][2] = 0, then it means that the fifth dust removal point can start dust removal; If P > A[5][1] + the continuous dust generation time of the sixth dust removal point, and A[5][2] = 0, then it means that the sixth dust removal point can start dust removal; If P > A[6][1] + the continuous dust generation time of the seventh dust removal point, and A[6][2] = 0, then it means that the seventh dust removal point can start dust removal; If P > A[7][1] + the continuous dust generation time of the eighth dust removal point, and A[7][2] = 0, then it means that the eighth dust removal point can start dust removal.

2. The dust removal system control method based on L1 and L3 production plans according to claim 1, characterized in that: The maximum allowable delay time for the fifth to eighth work points is higher than the maximum allowable delay time for any one of the first to third dust removal points.

3. The dust removal system control method based on L1 and L3 production plans according to claim 2, characterized in that: In step 3, a maximum of 4 dust removal points are allowed to operate simultaneously.

4. The dust removal system control method based on L1 and L3 production plans according to claim 3, characterized in that: In step 2, the data in array A[i][j] is updated every minute.

Images