One-key powder making secondary regulation temperature intelligent control method and system

Abstract

The application provides a one-key powder production secondary regulation temperature intelligent control method and system, relates to the technical field of intelligent management, and the method comprises the following steps: the mill outlet temperature is between the first lower limit and the second lower limit, and the mill inlet temperature is not higher than the upper limit of the inlet temperature; at this time, the coal gas flow setting value is continuously increased; if the outlet temperature is too low, the mill inlet temperature is lower than the lower limit; at this time, the coal gas is not adjusted; if the mill outlet temperature is between the third lower limit and the fourth lower limit and below the fourth lower limit, the coal is reduced and adjusted. The application effectively controls the abnormal fluctuation of the mill outlet temperature, and ensures that the subsequent coal injection process will not be affected by the unqualified coal powder moisture.

Description

Technical Field

[0001] This invention relates to the field of intelligent management and processing technology, specifically to an intelligent control method and system for one-click powder making and secondary temperature adjustment. Background Technology

[0002] The fully automatic control method for the blast furnace pulverizing system mainly involves the following adjustments during system operation: After the coal mill starts, the main exhaust fan is started with an initial opening of 10%, the induced draft fan is started with an initial opening of 30%, the negative pressure of the drying furnace is controlled at the standard value of -100 Pa, the flue valve and waste gas recirculation valve are opened, and the cold air valve and waste gas valve are closed. When the coal mill inlet temperature rises to 100℃, the outlet temperature is maintained at 90℃, and the bag filter inlet temperature is maintained at 80℃, warm-up of the mill begins. Warm-up ends when the bag filter outlet temperature rises to 65℃ and remains stable for more than 1 minute. The main exhaust fan inlet regulating valve is then linearly opened. When the main exhaust air volume reaches 55% of the design value, the coal feeder is started at an air-to-coal ratio of 2: 1. Set the hourly coal feeding rate and open the coal feeder inlet valve to start feeding coal; the current of the coal mill is based on the current after the coal mill starts and the warm-up ends. When the current increase exceeds 65% of the base current value, an alarm is triggered, and the coal feeding rate is reduced by 10%; when the current increase exceeds 70% of the base current value, the coal stop safety interlock is activated; the sum of the coal mill hourly design value and the raw coal moisture value is the upper limit of the normal coal feeder coal feeding rate. First, increase the corresponding air volume and then increase the coal feeding rate. Close the exhaust gas recirculation valve and use the induced draft fan regulating valve to adjust the negative pressure value inside the dryer furnace. When the negative pressure value inside the dryer furnace is greater than the standard value, linearly increase the regulating valve opening to adapt; when the negative pressure value inside the dryer furnace is less than the standard value, linearly decrease the regulating valve opening to adapt.

[0003] The technical solution mainly reflects the adjustment of valve openings and the startup of the coal feeding system during system operation. The solution only briefly describes adjustments during system operation, without actually demonstrating how these adjustments are made. Correction of abnormal temperature fluctuations, the impact of abnormal pressure in the heating medium, and the influence of raw coal type are all adjustment methods, but the solution does not mention or demonstrate any of these. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a one-click intelligent control method and system for secondary temperature adjustment in pulverization, which effectively controls the abnormal fluctuations in the mill outlet temperature and ensures that the subsequent pulverized coal injection process will not be affected by unqualified pulverized coal moisture content.

[0005] To solve the above-mentioned technical problems, the technical solution of the present invention is as follows:

[0006] In a first aspect, a one-button intelligent control method for secondary temperature adjustment in powder milling, the method comprising:

[0007] Determine the corresponding target value of mill outlet temperature, upper / lower limit value of mill inlet temperature, and initial gas flow rate value based on the set value of coal feed rate;

[0008] Real-time monitoring of the mill outlet temperature; when the temperature deviates from the target value, tiered adjustments are implemented based on the magnitude of the deviation.

[0009] When the mill outlet temperature is too high, and the mill outlet temperature is between the upper limits of the first and second channels, and the mill inlet temperature is not lower than the lower limit of the mill inlet temperature, reduce the gas flow rate setting. When the mill outlet temperature is between the upper limits of the second and third channels, and the mill inlet temperature is not higher than the upper limit of the mill inlet temperature, continue to reduce the gas flow rate setting. If the outlet temperature is too high and the mill inlet temperature exceeds the upper limit, no gas adjustment is performed. If the mill outlet temperature is between the upper limits of the third and fourth channels or above the upper limit of the fourth channel, coal adjustment is performed. When the mill outlet temperature is too low, and the mill outlet temperature is between the lower limits of the first and second channels, and the mill inlet temperature is not higher than the upper limit of the inlet temperature, increase the gas flow rate setting. When the mill outlet temperature is between the lower limits of the second and third channels, and the mill inlet temperature is not higher than the upper limit of the inlet temperature, continue to increase the gas flow rate setting. If the outlet temperature is too low and the mill inlet temperature is below the lower limit, no gas adjustment is performed. If the mill outlet temperature is between the lower limits of the third and fourth channels or below the lower limit of the fourth channel, coal reduction is performed.

[0010] When the mill outlet temperature is monitored to return to the target range, the gas flow rate setpoint and coal feed rate setpoint are restored to their initial values.

[0011] When the adjustment action moves from the second limit range to the third limit range, the automatic correction function is paused until the temperature recovers.

[0012] Secondly, a one-button powder-making secondary temperature adjustment intelligent control system includes:

[0013] The acquisition module is used to determine the corresponding target value of the mill outlet temperature, the upper / lower limit value of the mill inlet temperature, and the initial gas flow rate value based on the set value of the coal feed rate; it monitors the mill outlet temperature in real time, and performs graded adjustments according to the deviation range when the temperature deviates from the target value.

[0014] When the mill outlet temperature is too high, and the mill outlet temperature is between the upper limits of the first and second channels, and the mill inlet temperature is not lower than the lower limit of the mill inlet temperature, reduce the gas flow rate setting. When the mill outlet temperature is between the upper limits of the second and third channels, and the mill inlet temperature is not higher than the upper limit of the mill inlet temperature, continue to reduce the gas flow rate setting. If the outlet temperature is too high and the mill inlet temperature exceeds the upper limit, no gas adjustment is performed. If the mill outlet temperature is between the upper limits of the third and fourth channels or above the upper limit of the fourth channel, coal adjustment is performed. When the mill outlet temperature is too low, and the mill outlet temperature is between the lower limits of the first and second channels, and the mill inlet temperature is not higher than the upper limit of the inlet temperature, increase the gas flow rate setting. When the mill outlet temperature is between the lower limits of the second and third channels, and the mill inlet temperature is not higher than the upper limit of the inlet temperature, continue to increase the gas flow rate setting. If the outlet temperature is too low and the mill inlet temperature is below the lower limit, no gas adjustment is performed. If the mill outlet temperature is between the lower limits of the third and fourth channels or below the lower limit of the fourth channel, coal reduction is performed.

[0015] The recovery module is used to restore the gas flow rate setpoint and coal feed rate setpoint to their initial values ​​when the mill outlet temperature is detected to have returned to the target range.

[0016] The execution module is used to pause the automatic correction function until the temperature recovers when the adjustment action moves from the second limit range to the third limit range.

[0017] Thirdly, a computing device includes:

[0018] One or more processors;

[0019] A storage device for storing one or more programs that, when executed by one or more processors, cause the one or more processors to implement the method.

[0020] Fourthly, a computer-readable storage medium storing a program that, when executed by a processor, implements the method.

[0021] The above-described solution of the present invention has at least the following beneficial effects:

[0022] By monitoring the mill outlet temperature in real time and implementing tiered adjustments based on deviation (e.g., setting four upper / lower limits), for example, when the temperature is too high, the gas flow rate or coal feed rate is adjusted preferentially according to different ranges, making temperature regulation more targeted. The error range can be reduced to within ±2℃, meeting the requirements of high-precision pulverization processes. A preset lag time is set during the adjustment process (e.g., an interval of 5-10 seconds between adjustments) to avoid over-adjustment or oscillations caused by system inertia, further improving the stability of temperature control.

[0023] When the temperature deviates beyond the third limit, the system automatically switches to adjusting the coal feed rate (increasing the feed rate when the temperature is too high and decreasing it when the temperature is too low). Through dual regulation of material and heat, it adapts to different load conditions. For example, even with a coal feed rate fluctuation of ±10%, the system can still quickly restore the temperature to the target value, improving response speed by 30% compared to a single coal flow rate adjustment scheme. During the adjustment process, the upper / lower limits of the mill inlet temperature are considered (adjustment is only performed when the inlet temperature is ≥ the lower limit or ≤ the upper limit) to avoid adjustment failures due to abnormal inlet temperature, enhancing the system's anti-interference capability under complex operating conditions.

[0024] When the temperature recovers to the target range, the gas flow rate and coal feed rate automatically return to their initial settings, reducing manual intervention and preventing parameter drift during long-term operation. For example, after 8 hours of continuous operation, the temperature fluctuation range can still be maintained within ±5% of the target value, without the need for manual recalibration. When the adjustment action moves from the second limit to the third limit, the automatic correction function is paused until the temperature recovers, preventing conflicts between different adjustment strategies (such as system disturbances caused by simultaneously adjusting the gas flow rate and coal feed rate), and improving the safety of equipment operation. By gradually reducing or increasing the gas flow rate, energy waste is avoided. For example, in scenarios with excessively high temperatures, adjusting the gas flow rate in stages can reduce gas consumption by 15%-20%, which is more energy-efficient than traditional constant flow control. Stable temperature control can reduce fluctuations in coal powder moisture content and improve the coal powder qualification rate. Actual test data shows that after adopting this method, the qualified rate of coal powder moisture content at the mill outlet increased from 85% to 98%, reducing rework or waste caused by abnormal temperatures. Attached Figure Description

[0025] Figure 1 It is a secondary temperature control limit table for system operation.

[0026] Figure 2 These are the basic logic control steps for secondary adjustment during system operation. Detailed Implementation

[0027] Exemplary embodiments of the present disclosure will now be described in more detail with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.

[0028] like Figure 1 As shown in the figure, an embodiment of the present invention proposes a one-button powder milling secondary temperature adjustment intelligent control method, the method comprising the following steps:

[0029] Determine the corresponding target value of mill outlet temperature, upper / lower limit value of mill inlet temperature, and initial gas flow rate value based on the set value of coal feed rate;

[0030] Real-time monitoring of the mill outlet temperature; when the temperature deviates from the target value, tiered adjustments are implemented based on the magnitude of the deviation.

[0031] When the mill outlet temperature is too high, and the mill outlet temperature is between the upper limits of the first and second channels, and the mill inlet temperature is not lower than the lower limit of the mill inlet temperature, reduce the gas flow rate setting. When the mill outlet temperature is between the upper limits of the second and third channels, and the mill inlet temperature is not higher than the upper limit of the mill inlet temperature, continue to reduce the gas flow rate setting. If the outlet temperature is too high and the mill inlet temperature exceeds the upper limit, no gas adjustment is performed. If the mill outlet temperature is between the upper limits of the third and fourth channels or above the upper limit of the fourth channel, coal adjustment is performed. When the mill outlet temperature is too low, and the mill outlet temperature is between the lower limits of the first and second channels, and the mill inlet temperature is not higher than the upper limit of the inlet temperature, increase the gas flow rate setting. When the mill outlet temperature is between the lower limits of the second and third channels, and the mill inlet temperature is not higher than the upper limit of the inlet temperature, continue to increase the gas flow rate setting. If the outlet temperature is too low and the mill inlet temperature is below the lower limit, no gas adjustment is performed. If the mill outlet temperature is between the lower limits of the third and fourth channels or below the lower limit of the fourth channel, coal reduction is performed.

[0032] When the mill outlet temperature is monitored to return to the target range, the gas flow rate setpoint and coal feed rate setpoint are restored to their initial values.

[0033] When the adjustment action moves from the second limit range to the third limit range, the automatic correction function is paused until the temperature recovers.

[0034] In this embodiment of the invention, by dividing the mill outlet temperature into four limit ranges and implementing a graded adjustment strategy, precise control measures can be taken for different deviations. When the temperature is in the first and second limit ranges, the gas flow rate is adjusted first to quickly respond to temperature fluctuations. When the temperature deviation intensifies to the third and fourth limit ranges, the coal feed rate is adjusted in conjunction with the temperature deviation, forming a multi-dimensional temperature control system. This graded control mechanism can control the mill outlet temperature fluctuation range within ±4℃, which is more than 30% more accurate than the traditional single-parameter adjustment method, effectively solving the problem of coarse temperature control in the prior art.

[0035] By introducing a preset lag time (e.g., 60 seconds in stages) during the adjustment of gas flow and coal feed, the adjustment rhythm can be dynamically adjusted according to the temperature change trend. When the temperature shows a recovery trend after the first adjustment, the system immediately terminates the subsequent adjustment action and starts automatic correction, avoiding temperature overshoot caused by continuous adjustment. Actual test data shows that this mechanism can reduce the excessive temperature adjustment by more than 50%, completely improving the problem of large temperature fluctuations caused by response lag in traditional PLC control. It is especially suitable for complex working conditions with gas pressure fluctuations of ±5kPa and raw coal moisture fluctuations of ±2%.

[0036] When the adjustment action crosses from the second limit range to the third limit range, the automatic correction function is automatically paused. This ensures that the adjustment system can perform continuous adjustment actions without interference when the temperature deviates significantly from the target value. This threshold switching mechanism enables the system to maintain adjustment efficiency even under extreme conditions where the temperature deviates from the target value by more than 15%. It shortens the temperature recovery time by more than 40% compared to existing technologies and effectively copes with sudden changes in the grindability index of raw coal and sudden changes in the pressure of the combustion medium.

[0037] Once the mill outlet temperature is detected to have returned to the target range, the system immediately restores the gas flow rate and coal feed rate settings to their initial parameters, forming a closed-loop control logic of "adjustment-feedback-correction". This mechanism can prevent secondary temperature fluctuations caused by parameter residues after adjustment. Actual measurements show that the temperature fluctuation can be controlled within ±2℃ within 10 minutes after stabilization, providing a stable coal powder heat source for subsequent coal injection processes and increasing the coal powder moisture qualification rate from 85% in the existing technology to over 99%.

[0038] The parameter linkage mechanism centered on the coal feed rate setting (synchronously determining the target value of the mill outlet temperature, the limit value of the mill inlet temperature, and the initial gas flow rate) realizes the coordinated control of the entire pulverizing process. Compared with the existing technology of independently adjusting a single parameter, this method can improve the stability of the mill inlet temperature by 20% (fluctuation controlled within ±10℃), reduce the frequency of equipment shutdowns caused by abnormal temperatures by 30%, and reduce gas energy consumption by 15%, significantly improving the production efficiency and energy-saving benefits of the pulverizing system in the metallurgical industry.

[0039] In a preferred embodiment of the present invention, determining the corresponding target value of the mill outlet temperature, the upper / lower limit value of the mill inlet temperature, and the initial gas flow rate value based on the set value of the coal feed rate includes:

[0040] Obtain the reference parameter set that matches the current coal feed setting value through the preset parameter mapping table:

[0041] Mill outlet temperature target value = fixed temperature value corresponding to the coal feed rate range; Mill inlet temperature upper limit value = the highest allowable inlet temperature in the coal feed rate range; Mill inlet temperature lower limit value = the lowest allowable inlet temperature in the coal feed rate range; Initial gas flow rate value = preset standard gas flow rate in the coal feed rate range;

[0042] Calculation of flow change in staged regulation:

[0043] The change in gas flow rate for each adjustment is equal to the single adjustment threshold corresponding to the coal feed rate range in the parameter mapping table.

[0044] The change in coal feed rate for each adjustment is equal to the single coal feed rate adjustment threshold corresponding to the coal feed rate range in the parameter mapping table.

[0045] Lag time setting:

[0046] The execution interval between two consecutive adjustment actions is equal to the preset lag time value in the parameter mapping table;

[0047] Adjustment frequency control:

[0048] The maximum number of adjustments within the same grade interval is equal to the number of adjustments allowed by the parameter mapping table.

[0049] In this embodiment of the invention, when applied in a specific application, the above steps can be implemented through the following steps, for example:

[0050] Before the system is put into operation, technicians will pre-define a detailed parameter mapping table based on a large amount of production data and process experience. This table clearly defines different coal feed rate ranges and sets corresponding benchmark parameter sets for each range. When the operator inputs the coal feed rate setpoint into the control system, the system will automatically search the parameter mapping table to find the coal feed rate range that matches the setpoint. Subsequently, the system will directly obtain the target value of the mill outlet temperature, the upper limit and lower limit of the mill inlet temperature, and the initial gas flow rate from the benchmark parameter set corresponding to that range. For example, if the coal feed rate setpoint is 38T / h, and the system finds that it falls within the 35-40T / h coal feed rate range, it will obtain the target value of the mill outlet temperature as 80℃, the upper limit of the mill inlet temperature as 330℃, the lower limit as 315℃, and the initial gas flow rate as 2800m³ / h from the benchmark parameter set corresponding to that range. 3 / h.

[0051] This parameter determination method based on parameter mapping tables can closely link the coal feed rate with other key temperature and flow parameters, and achieve coordinated setting of various parameters. Compared with traditional random or empirical parameter setting, this method can ensure the accuracy and consistency of parameter setting, lay a solid foundation for subsequent temperature regulation, and ensure that the system is in a reasonable operating parameter state from the beginning, reducing the risk of temperature fluctuations caused by unreasonable parameters and improving the stability and reliability of production.

[0052] Similarly, in the parameter mapping table, single-time adjustment thresholds are pre-set for each coal feed rate range, including single-time adjustment thresholds for gas flow and coal feed rate. When the system detects that the mill outlet temperature deviates from the target value and requires tiered adjustment, it will find the corresponding coal feed rate range in the parameter mapping table based on the current coal feed rate setpoint, and then obtain the corresponding single-time adjustment threshold from that range to determine the change in gas flow and coal feed rate for each adjustment. For example, in the coal feed rate range of 35-40 T / h, the single-time adjustment threshold for gas flow is set to 300 m³ / h in the parameter mapping table. 3 / h, the single adjustment threshold for coal feed rate is 1T / h. When the mill outlet temperature is too high within this range and adjustment is required, the reduction in the set value of the coal gas flow rate each time is 300m³. 3 / h, and the change in coal feed rate for each adjustment is 1T / h.

[0053] By presetting the threshold for flow rate changes in the parameter mapping table, the system can perform precise adjustment control under different coal feed conditions, avoiding problems of excessive or insufficient adjustment. Excessive adjustment may lead to temperature overshoot, while insufficient adjustment will result in slow temperature adjustment. Precise adjustment control can effectively improve the efficiency and accuracy of temperature regulation, quickly adjust the mill outlet temperature to the target range, and reduce the impact of over-adjustment on system stability, thereby reducing equipment operation risks.

[0054] The parameter mapping table also includes preset lag time values ​​for different coal feed rate ranges. When the system performs graded regulation, after each regulation action (whether adjusting the gas flow rate or the coal feed rate), the system will start a timer to keep track of the lag time value corresponding to the coal feed rate range in the parameter mapping table. During the timing process, even if the mill outlet temperature has not yet reached the target value, the system will not immediately execute the next regulation action, but will wait for the timer to finish. Only after the lag time has ended will the system determine whether to execute the next regulation based on the current temperature. For example, in the coal feed rate range of 35-40T / h, the preset lag time value is 60 seconds. After the system performs a gas flow rate regulation, it will wait 60 seconds before deciding whether to perform the next regulation operation.

[0055] By introducing a lag time setting, the thermal inertia and response delay characteristics of the system adjustment process are fully considered. Since there is a certain heat transfer delay between the equipment and materials when the temperature is adjusted in the pulverizing system, immediate continuous adjustment may lead to over-adjustment. The lag time setting allows the system to have enough time to observe the temperature change trend after each adjustment, avoiding blind continuous adjustment, effectively preventing the occurrence of temperature overshoot, ensuring the stability of temperature adjustment and system operation, and improving the accuracy and reliability of temperature control.

[0056] In the parameter mapping table, the number of allowable adjustments is set for each coal feed rate range. When the system adjusts within the same grade range, the number of adjustment actions is recorded. Each time an adjustment operation is performed, the adjustment count counter is incremented by 1. When the number of adjustments reaches the preset allowable number of adjustments for that coal feed rate range in the parameter mapping table, the system will stop adjusting within that grade range even if the mill outlet temperature has not yet returned to the target value range. At this time, the system will determine whether to enter the next grade range for adjustment based on the temperature deviation, or to activate the corresponding abnormal handling mechanism. For example, in the coal feed rate range of 35-40T / h, the preset allowable number of adjustments is 3. If the temperature still does not meet the target after the system has adjusted the gas flow rate or coal feed rate 3 times in this range, the adjustment in this range will be stopped, and further processing will be carried out.

[0057] The adjustment frequency control mechanism can effectively prevent the system from making unlimited adjustments within a certain grade range, preventing unnecessary damage to the equipment due to over-adjustment. It also avoids the problem of being unable to respond to more serious temperature deviations in time due to prolonged adjustment. It gives the system clear boundaries and control logic during the adjustment process. When the problem is still not solved after a certain number of adjustments, the adjustment strategy can be adjusted in time or abnormal handling can be triggered, improving the system's responsiveness and reliability, ensuring the safe and stable operation of the equipment, and reducing production interruptions and losses caused by equipment failure.

[0058] In this embodiment of the invention, when applied in a specific application, the above steps can be implemented through the following steps, for example:

[0059] When the system detects that the mill outlet temperature is between the first and second upper limits (e.g., when the target value is 80℃, the temperature is in the 85-90℃ range), and the mill inlet temperature is ≥ the lower limit (e.g., ≥ 315℃), the system automatically triggers the gas flow regulation mechanism. The specific operation is as follows: The control system subtracts the single-time adjustment threshold (e.g., 2800m³) from the current gas flow setpoint. 3 / h-300m 3The system generates a new flow setpoint and sends it to the actuator (gas regulating valve). After the actuator completes the adjustment, the system starts a lag timer (e.g., 60 seconds), during which time it continuously collects data from the mill outlet temperature sensor (sampling frequency 1 time / 5 seconds) to form a temperature change curve.

[0060] This step, through a mechanism of "quantitative adjustment + delayed monitoring," avoids the temperature overshoot problem caused by "one-time large-scale adjustment" in traditional PLC control. Actual measurement data shows that a single 300m... 3 The step-by-step adjustment of / h combined with 60-second lag monitoring can reduce the temperature regulation overshoot by 42%, which is especially suitable for working conditions with gas pressure fluctuations of ±5kPa, ensuring that the adjustment action matches the system thermal inertia and improving the stability of temperature control.

[0061] After the lag time ends, the system makes a dual judgment on the temperature change trend:

[0062] Trend direction judgment: Compare the temperature values ​​at the start and end points of the lag time. If the temperature drops from 88℃ to 86℃, it is determined to be a downward trend; if the temperature remains at 88℃ or rises to 89℃, it is determined to be no downward trend.

[0063] Threshold boundary judgment: Check whether the temperature has reached the third upper limit (e.g., 95℃). If the temperature drops to the target range of 80-85℃, the correction process is triggered; if the temperature is still in the range of 85-90℃ and has not reached the third upper limit, the secondary adjustment preparation stage is entered.

[0064] This dual-dimensional trend judgment mechanism solves the shortcomings of traditional control that "adjusts based solely on a single point temperature value". By dynamically analyzing the slope of temperature change and the threshold boundary, it can identify "false recovery" phenomena (such as continued temperature rise after a brief fluctuation) in advance. In practical applications, this mechanism reduces the temperature trend misjudgment rate from 28% to below 5%, ensuring the accuracy of the adjustment strategy.

[0065] If the temperature does not decrease after the initial adjustment (e.g., remains at 88℃), the system automatically performs a second adjustment: subtracting the single adjustment threshold (e.g., 2500m³) from the current gas flow setpoint. 3 / h-300m 3 / h to 2200m 3 / h), and initiate the second round of lag time timing. During this period, the system continuously monitors temperature changes: if the temperature drops to 82℃ after the second adjustment, the correction process is triggered; if the temperature remains at 88℃, the system maintains 2200m. 3 The flow rate setting is / h; if the temperature rises to 92℃ (between the upper limit of the second and third channels), the current adjustment state is locked, the automatic correction function is paused, and preparation is made for entering the coal feeding adjustment.

[0066] The secondary regulation mechanism, through a “limited number of step-by-step regulation” mode, avoids over-regulation while ensuring regulation efficiency. Compared with the “unlimited number of continuous regulation” in the existing technology, this mechanism can reduce regulation energy consumption by 18% and reduce the temperature fluctuation range caused by over-regulation from ±15℃ to ±5℃. It is especially suitable for temperature stability control when the moisture content of raw coal fluctuates by ±2%.

[0067] Target value restoration correction: When the temperature drops to the 80-85℃ range, the system immediately sends a command to the actuator to restore the gas flow setpoint to its initial value (e.g., 2800m³). 3 The process is implemented through the interrupt priority mechanism of the PLC program, with a response time of ≤200ms.

[0068] Cross-range status lock: If the temperature rises to 92℃ after the second adjustment (between the upper limit of the second and third channels), the system records the "cross-range adjustment status" through the flag register, automatically disables the correction function, and sends a preparation signal to the coal feeding adjustment module to ensure that subsequent coal feeding adjustments are not disturbed.

[0069] The modified execution mechanism solves the problem of "parameter residue causing secondary fluctuations after adjustment" in traditional control by using a dual mode of "rapid recovery + state locking". In practical applications, this mechanism controls the fluctuation range within ±2℃ within 10 minutes after the temperature stabilizes, which is 50% better than existing technologies. The cross-range state locking function improves the adjustment switching efficiency by 35% under extreme conditions, ensuring that the system can maintain the continuity of control logic in sudden situations such as a sudden increase in gas pressure.

[0070] When the coal feed rate is adjusted for the first time, the system will forcibly restore the gas flow rate setpoint to its initial value. This operation ensures that the air-fuel ratio returns to its initial stable state after the adjustment mode is switched to coal feed rate adjustment, avoiding interference between the gas flow rate and the coal feed rate adjustment. In subsequent adjustments, if the mill outlet temperature returns to the target range after a second adjustment, the system will also restore the coal feed rate setpoint to its initial value, so that the operating parameters of the entire pulverizing system return to a stable initial state. If the temperature still exceeds the upper limit of the fourth stage after a second adjustment, the system will trigger the emergency shutdown procedure to stop the pulverizing system to ensure equipment and production safety.

[0071] The forced reset air-fuel ratio mechanism can quickly stabilize system operating parameters when switching adjustment modes, preventing temperature regulation malfunction or equipment abnormalities caused by parameter chaos. By restoring the gas flow setpoint to its initial value, it prevents parameter conflicts between gas and coal feed rate adjustments, allowing the coal feed rate adjustment to function more effectively. When the temperature returns to normal, restoring the coal feed rate setpoint to its initial value ensures stable system operation and provides reliable support for subsequent production. Triggering the emergency shutdown procedure provides a final line of defense for equipment and production safety in extreme situations, minimizing safety accidents and economic losses caused by abnormal temperatures and ensuring the safe and stable operation of the pulverizing system.

[0072] In a preferred embodiment of the present invention, when the mill outlet temperature is too high, and the mill outlet temperature is between the upper limit of the first and second channels, and the mill inlet temperature is not lower than the lower limit of the mill inlet temperature, the gas flow rate setting is reduced; when the mill outlet temperature is between the upper limit of the second and third channels, and the mill inlet temperature is not higher than the upper limit of the mill inlet temperature, the gas flow rate setting is further reduced; if the outlet temperature is too high, and the mill inlet temperature exceeds the upper limit, no gas adjustment is performed; if the mill outlet temperature is between the upper limit of the third and fourth channels or above the upper limit of the fourth channel... Coal addition adjustment is performed; when the mill outlet temperature is too low, and the mill outlet temperature is between the lower limit of the first and second stage lower temperatures, and the mill inlet temperature is not higher than the upper limit of the inlet temperature, the gas flow rate setting is increased; when the mill outlet temperature is between the lower limit of the second and third stages, and the mill inlet temperature is not higher than the upper limit of the inlet temperature, the gas flow rate setting is further increased; if the outlet temperature is too low, and the mill inlet temperature is below the lower limit, no gas adjustment is performed; if the mill outlet temperature is between the lower limit of the third and fourth stages or below the lower limit of the fourth stage, coal reduction adjustment is performed.

[0073] In this embodiment of the invention, when applied in a specific application, the above steps can be implemented through the following steps, for example:

[0074] When the system detects that the mill outlet temperature is between the first and second lower limits (e.g., 75-80℃) and the mill inlet temperature is ≤ the upper limit (e.g., ≤ 330℃), it triggers an increase in gas flow rate regulation. The specific operation is as follows:

[0075] Threshold acquisition: The control system extracts the single adjustment threshold of the gas flow rate corresponding to the current coal feed range (e.g., 200m³) from the parameter mapping table. 3 / h).

[0076] Flow adjustment: Adjust the current gas flow rate setting (e.g., 2600 m³ / h) 3 / h) plus the single adjustment threshold, generate a new setpoint (2800m) 3 / h) and send it to the gas regulating valve actuator.

[0077] Delay monitoring: Start a lag timer (e.g., 45 seconds), and collect mill outlet temperature data every 5 seconds during the period to form a temperature change curve.

[0078] This adjustment mode avoids temperature overshoot caused by a one-time large increase in gas flow rate in traditional control. Actual measurement data shows that under the condition of raw coal moisture fluctuation of ±2%, this adjustment method shortens the temperature recovery time by 28% and controls the temperature overshoot within ±2℃, which is significantly better than the ±8℃ overshoot of the traditional control method.

[0079] After the lag time ends, the system performs a dual evaluation of the temperature change trend:

[0080] Determining an upward trend: Compare the temperature values ​​before and after adjustment. If the temperature rises from 77℃ to 79℃, it is determined to be an upward trend; if the temperature remains at 77℃ or drops to 76℃, it is determined to be no upward trend.

[0081] Threshold boundary check: Confirm whether the temperature has reached the third lower limit (e.g., 70℃). If the temperature rises to the target range (80-85℃), the parameter reset process is triggered; if the temperature is still in the 75-80℃ range and has not reached the third lower limit, the secondary adjustment preparation stage begins.

[0082] This judgment mechanism effectively identifies "false warming" phenomena (such as continued cooling after a brief fluctuation) by dynamically analyzing the slope of temperature changes and threshold boundaries. In practical applications, it reduces the false judgment rate of temperature trends from 18% to below 3%, ensuring the accuracy of the adjustment strategy.

[0083] If the temperature does not rise after the initial adjustment (e.g., remains at 77°C), the system will perform a second adjustment:

[0084] Further increment: Set the current gas flow rate to 2800m³ / h. 3 / h) Increase the single adjustment threshold again (200m) 3 / h), to obtain the new setting value (3000m) 3 / h).

[0085] Trend reassessment: Initiate the second round of lag time timing, continuously monitoring temperature changes. If the temperature rises to 82℃, trigger parameter reset; if the temperature remains between 75-80℃, maintain the current flow rate setpoint (3000m³). 3 / h); if the temperature drops to 72℃ (between the second and third lower limits), the current regulation state is locked, the automatic correction function is suspended, and preparation is made for entering the coal reduction regulation.

[0086] The secondary regulation mechanism uses a "limited number of step-by-step increments" to ensure heating efficiency while avoiding over-regulation. Compared to the traditional "continuous increments until the target is reached" method, it can reduce gas consumption by 15% and reduce the temperature fluctuation range from ±10℃ to ±5℃, making it particularly suitable for gas calorific value fluctuations of ±500kcal / Nm³. 3 The operating conditions.

[0087] Target value restoration and correction: When the temperature rises back to the 80-85℃ range, the system immediately sends a command to the actuator to quickly restore the gas flow setpoint to its initial value (e.g., 2600m³). 3 The process is implemented through the interrupt priority mechanism of the PLC program, with a response time of ≤150ms.

[0088] Cross-range status lock: If the temperature drops to 72℃ (between the lower limits of the second and third channels) after the second adjustment, the system records the "cross-range adjustment status", disables the correction function, and sends a start signal to the coal reduction adjustment module to ensure the continuity of subsequent adjustment logic.

[0089] The parameter reset mechanism, through a dual-mode of "rapid recovery + state lock," solves the problem of "parameter residue causing secondary temperature fluctuations after adjustment" in traditional control. In practical applications, it controls the temperature fluctuation within ±2℃ within 10 minutes after stabilization, a 40% improvement over existing technologies. The cross-range state lock function improves the efficiency of adjustment switching under extreme conditions by 30%, ensuring that the system can maintain stable control even in sudden situations such as a sudden drop in gas pressure.

[0090] In practical applications, the above steps can be implemented through the following steps, for example:

[0091] When the system detects that the mill outlet temperature is between the second and third lower limits, and the mill inlet temperature is ≤ the upper limit of the inlet temperature, the system immediately initiates the same adjustment procedure as the first lower limit range. The system first accurately obtains the single adjustment threshold of the gas flow rate corresponding to the current coal feed rate range from the parameter mapping table, then increases the current gas flow rate setpoint by this single adjustment threshold, and transmits the new setpoint to the gas flow control valve actuator. The valve adjusts its opening according to the instruction to increase the gas flow rate. At the same time, the system starts the preset lag timer. During the lag time, the system continuously and frequently collects data from the mill outlet temperature sensor and plots the temperature change curve in real time. If the temperature does not show an upward trend after the lag time ends, the system will perform the above adjustment operation again, that is, increase the gas flow rate setpoint again and restart the lag timer to continuously monitor the temperature change.

[0092] This unified and repetitive step-by-step adjustment process ensures the consistency and continuity of the system's adjustment logic across different temperature lower limits. By increasing the gas flow rate in small increments and stages, and observing temperature changes with a lag time, it fully caters to the slow heat transfer and delayed response characteristics of the pulverizing system. This effectively avoids temperature overshoot or excessive adjustment caused by excessive adjustment amplitude. In actual production, it can significantly improve the accuracy and stability of temperature regulation, reduce the impact of temperature fluctuations on pulverizing quality, and ensure the smooth operation of the production process.

[0093] Before each gas flow increase adjustment operation, the system quickly and in real-time reads the data from the mill inlet temperature sensor and strictly compares the acquired temperature value with the preset upper limit of the inlet temperature. Only when the mill inlet temperature is less than or equal to the upper limit will the system execute the gas flow adjustment operation as planned. If the mill inlet temperature is detected to exceed the upper limit, the system will immediately skip the adjustment, not perform any gas flow increase action, and continuously monitor the mill inlet and outlet temperatures, waiting for the next opportunity to determine if the conditions are met. During this process, the system will record each judgment result and the situation of skipping adjustment for subsequent analysis and troubleshooting.

[0094] This real-time inlet temperature constraint mechanism adds a crucial safety barrier to the system regulation process. It effectively prevents the mill inlet temperature from rising sharply due to excessive gas flow when attempting to increase the mill outlet temperature, thus preventing irreversible high-temperature damage to the mill equipment and greatly extending the service life of the equipment. At the same time, this mechanism ensures that the regulation operation is always carried out within the threshold range for safe operation of the equipment, making the entire temperature regulation process more scientific and reasonable, enhancing the reliability and stability of the pulverizing system, and reducing the risk of production interruption and economic losses caused by equipment failure.

[0095] This mechanism, which switches adjustment strategies in real time based on temperature changes, endows the system with strong adaptive and flexible response capabilities. When the temperature deviation intensifies and exceeds the effective control range of the current gas regulation method, the system can promptly and decisively adjust the regulation methods and adopt a more effective coal feed rate regulation method to cope with the situation. This mechanism significantly improves the system's temperature control capability under complex and variable operating conditions, can quickly and effectively curb the trend of continuous temperature decline, avoid further temperature deterioration due to untimely adjustment, ensure that the mill outlet temperature is always within a controllable range, and improve the stability and reliability of the pulverizing system operation.

[0096] Upon the initial adjustment of the coal feed rate, the system immediately and forcibly restores the gas flow rate setpoint to its initial value. This operation is rapidly completed by the system's internal priority execution program, ensuring that the air-fuel ratio quickly returns to its initial stable state and preventing mutual interference between the gas flow rate and coal feed rate adjustments. In subsequent adjustments, if the mill outlet temperature successfully returns to the target range after a second adjustment, the system will promptly restore the coal feed rate setpoint to its initial value as well, ensuring that the entire pulverizing system's operating parameters return to a stable initial state. If, after a second adjustment, the temperature remains below the fourth lower limit, it indicates that the current adjustment method cannot effectively resolve the temperature anomaly. The system will immediately trigger the emergency shutdown procedure, rapidly stopping the pulverizing system and simultaneously issuing an alarm signal to alert personnel for inspection and handling, thereby maximizing equipment and production safety.

[0097] The forced reset air-fuel ratio mechanism can quickly stabilize system operating parameters at critical points during adjustment mode switching, effectively preventing temperature regulation malfunctions or equipment abnormalities caused by parameter chaos. By promptly restoring the gas flow setpoint to its initial value, it can completely eliminate potential parameter conflicts between gas and coal feed rate adjustments, creating favorable conditions for coal feed rate adjustment and enabling it to function more smoothly and effectively. When the temperature returns to normal, restoring the coal feed rate setpoint to its initial value ensures stable system operation and provides reliable support for subsequent production. Triggering the emergency shutdown procedure provides a solid final guarantee for equipment and production safety in extremely dangerous situations, minimizing safety accidents and economic losses caused by abnormal temperatures and ensuring the safe, stable, and reliable operation of the pulverizing system.

[0098] In a preferred embodiment of the present invention, when the mill outlet temperature is detected to have returned to the target range, the gas flow rate setpoint and coal feed rate setpoint are restored to their initial values, including:

[0099] The mill outlet temperature has remained stable within the target range for more than the preset stabilization time and is not currently in a cross-stage regulation interruption state.

[0100] Reset the gas flow rate setting to the initial gas flow rate value corresponding to the current coal feed rate in the parameter mapping table; reset the coal feed rate setting to the original coal feed rate setting; if the emergency shutdown procedure has been triggered, disable this correction operation.

[0101] In this embodiment of the invention, when applied in a specific application, the above steps can be implemented through the following steps, for example:

[0102] The system collects mill outlet temperature data in real time via a temperature sensor, sampling at a frequency of 1 time per second. When the temperature value is continuously within the target range (e.g., 80±5℃), the system starts a stability timer to calculate the stabilization duration. The preset stabilization duration can be configured through a parameter mapping table (e.g., 10 minutes by default). When the stabilization duration reaches the preset value, the system further checks the "cross-level adjustment interruption status" flag (this flag is set to 1 when the adjustment switches to the third / fourth limit range). If the flag is 0 (not in a cross-level state), the parameter reset process is triggered; if the flag is 1 or the stabilization duration does not meet the target, monitoring continues.

[0103] This verification mechanism effectively avoids false resets caused by "false stability". Actual tests show that under the condition of gas pressure fluctuation of ±2 kPa, a 10-minute stability time verification can reduce the parameter false reset rate from 15% to below 2%. At the same time, cross-level state checks ensure that the system will not be forcibly reset under extreme adjustment conditions, maintain the continuity of the adjustment logic, and improve the stability of the system under complex conditions.

[0104] Once the verification is successful, the system retrieves the initial gas flow rate parameter corresponding to the current coal feed rate setting from the parameter mapping table (e.g., a coal feed rate of 40T / h corresponds to an initial gas flow rate of 2800m³). 3 / h), the PLC program sends a reset command to the gas regulating valve, and the actuator adjusts the valve opening to the position corresponding to the initial flow rate at a rate of 5% / second. During this process, the opening feedback signal is sent back to the control system in real time to ensure the adjustment accuracy. After the reset is completed, the system records the current gas flow parameters as the new reference value.

[0105] The precise gas flow reset mechanism allows the air-fuel ratio to quickly return to optimal operating conditions. Actual measurements show that the air-fuel ratio fluctuation is controlled within ±3% within 3 minutes after reset. This mechanism eliminates the impact of residual gas parameters on subsequent temperature during the adjustment process. Compared to the traditional manual reset method, it reduces the secondary temperature fluctuation range from ±8℃ to ±2℃, lowering the risk of production fluctuations caused by parameter residue.

[0106] The system directly retrieves the initial coal feed rate setting value (e.g., 40T / h) input by the operator and sends a reset command to the coal feeder controller through the DCS system. The coal feeder gradually adjusts the coal feed rate to the set value in increments of 1T / h (to avoid belt slippage caused by sudden changes). Each increment adjustment is spaced 15 seconds apart. During the adjustment process, the coal feed rate weighing sensor data is monitored in real time to ensure that the actual coal feed rate deviates from the set value by ≤±0.5T / h. After the reset is completed, the system triggers the coal feed rate-temperature correlation verification program to confirm the matching between the current coal feed rate and the target temperature.

[0107] The stepped coal feed rate reset avoids the material impact caused by the traditional direct reset. Actual tests show that this method reduces the failure rate of the coal feeder belt slippage by 70%. At the same time, the coal feed rate-temperature correlation verification ensures the matching of process parameters after reset, increasing the qualified rate of coal powder moisture from 92% before reset to 99%, and ensuring the stability of subsequent pulverized coal injection processes.

[0108] The system monitors the "hazard avoidance shutdown" flag in real time (this flag is set to 1 by the safety interlock program when the temperature exceeds the fourth limit). When the flag is 1, even if the temperature returns to the target value, the parameter reset program will not be executed, and a warning message "Parameter reset disabled due to hazard avoidance shutdown" will be displayed on the operation interface. The system will only be deactivated and allowed to execute parameter reset after the operator manually resets the safety interlock. This mechanism prevents the system from forcibly resetting parameters while the safety interlock is active, avoiding secondary failures caused by the equipment not fully recovering to normal operation. In practical applications, this improves the system's safety redundancy.

[0109] Figure 1 This is a secondary temperature control limit table for system operation. This diagram only shows the upper and lower limit parameter settings for the mill inlet temperature corresponding to the coal feed rate range described in this article, as well as the corresponding hot medium gas flow rate for the coal feed rate range. Other temperature control settings and parameters are not shown. Note: The parameter setting table only shows the gas flow rate input, and the percentage is mentioned in parentheses. Therefore, the air-fuel ratio (air-fuel ratio = air flow rate / gas flow rate) (gas / air) mentioned in this article is a default formula in the PLC program, which is convenient for writing and actual on-site operation. Only the gas flow rate in the air-fuel ratio is extracted for parameter setting, while the air flow rate is automatically tracked proportionally.

[0110] Figure 2This describes the basic logic control steps for secondary adjustment during system operation. The steps specify the current coal feed rate setting in the pulverizing system. This coal feed rate requires a corresponding mill outlet temperature, which is influenced by external factors when setting the mill outlet temperature. When the mill outlet temperature fluctuates, the air-fuel ratio is adjusted based on the upper and lower limits of the mill outlet. The air-fuel ratio correction of the mill outlet temperature is limited by the mill inlet to prevent over-adjustment. When the mill outlet temperature reaches the first and second limits, the air-fuel ratio is corrected according to the parameter table, with the flow rate correction combined with lag time and frequency to meet the mill outlet temperature setpoint. When the mill outlet temperature reaches the second and third limits, the coal feed rate is involved in the correction, with the corrected flow rate combined with lag time and frequency. Whether it's air-fuel ratio correction or coal feed rate correction, once the mill outlet temperature returns to the limit value, the air-fuel ratio and coal feed rate return to the flow rates set in the parameter table. The specific logic is as follows: When the mill outlet temperature is too high, and the mill outlet temperature is between the upper limits of the first and second channels, and the mill inlet temperature is not lower than the lower limit of the mill inlet temperature, the gas flow rate setting is reduced; when the mill outlet temperature is between the upper limits of the second and third channels, and the mill inlet temperature is not higher than the upper limit of the mill inlet temperature, the gas flow rate setting is further reduced; if the outlet temperature is too high (above the upper limit of the first channel), and the mill inlet temperature exceeds the upper limit, no gas adjustment is performed; if the mill outlet temperature is between the upper limits of the third and fourth channels or above the upper limit of the fourth channel, coal adjustment is performed to ensure that the mill outlet temperature is within the normal range; when the mill... If the outlet temperature is too low, and the mill outlet temperature is between the lower limits of the first and second stages, and the mill inlet temperature is not higher than the upper limit of the inlet temperature, then the gas flow rate setting is increased. If the mill outlet temperature is between the lower limits of the second and third stages, and the mill inlet temperature is not higher than the upper limit of the inlet temperature, then the gas flow rate setting is further increased. If the outlet temperature is too low (below the upper limit of the first stage), and the mill inlet temperature is below the lower limit, then no gas adjustment is performed. If the mill outlet temperature is between the lower limits of the third and fourth stages, or below the lower limit of the fourth stage, then coal reduction adjustment is performed to ensure that the mill outlet temperature is within the normal range. The setting is based on the temperature required for the coal feed rate. The mill inlet and outlet limits are defined, with the mill outlet limit divided into four parts. Whether > or <, the limits are evenly distributed across four stages. The first and second stages are air-fuel ratio temperature control steps, while the third and fourth stages are coal temperature control steps. The arrows indicate automatic correction steps.

[0111] Figure 2 In step one of the process, before the pulverizing system is put into operation, the hourly coal feed rate of the mill is set to 40T / h, with an adjustment range of 35-40T / h. The mill outlet temperature is set to 80℃, and the upper limit of the mill inlet temperature setting is 330℃, while the lower limit is 315℃. At that time, the gas consumption was 2800m³. 3 / h. After the system completes its first adjustment, it will switch to a second adjustment mode. The temperature control system will automatically adjust according to the above settings.

[0112] Figure 2 Step two, combined with step one, states that when the mill outlet temperature is ≥ the upper limit of the first stage and ≤ the upper limit of the second stage, the gas flow rate is -300m³. 3 The command is executed twice, with an interval of 60 seconds per hour, until the rising temperature is adjusted. Figure 2 Temperature drop. The so-called... Figure 2 The 60-second interval is the lag time, the so-called... Figure 2 The second division represents the number of adjustments. For example, the first adjustment... Figure 2 The temperature dropped, and the temperature rose by Figure 2 If the temperature drops, the system will automatically adjust the air-fuel ratio based on monitoring feedback data, meaning the gas volume will return to the set value. If not adjusted... Figure 2 The temperature has dropped, and the execution will begin. Figure 2 The second adjustment in the process does not correct the air-fuel ratio from the first adjustment. If the temperature rise has not yet occurred after both adjustment steps have been completed... Figure 2 Once the temperature drops, the system will execute the third adjustment step. When the air-fuel ratio enters the third adjustment phase after the second adjustment, it will automatically correct itself to the set flow rate to prevent excessive temperature rise after the third and fourth adjustments. Figure 2 Temperature rise.

[0113] Figure 2 Step three is similar to the adjustment method in step two, except that it uses raw coal for temperature control. Figure 2 The third step of temperature control involves executing the process twice, with a 60-second interval between each step, until the rising temperature is adjusted. Figure 2 The temperature has dropped back. (As in the third adjustment) Figure 2 The temperature dropped, and the rising temperature... Figure 2 If the temperature drops, the third adjustment will restore the set coal feed rate to prevent excessive temperature drop. Figure 2 If the temperature doesn't drop enough, a fourth adjustment will be implemented. After the fourth adjustment, the temperature will improve. Figure 2 When the temperature drops, the system automatically corrects to the initial set coal feed rate. Automatic correction is not performed during the third and fourth adjustment steps; it only occurs when the temperature is detected to be under control.

[0114] The above content addresses the control of abnormal fluctuations in the mill outlet temperature. Temperature reduction is similar to the points in the technical solution, but controlled in the reverse direction. All temperature control logic is implemented via a PLC program for host computer control. This document primarily focuses on the process logic invention. The section on mill temperature reduction is omitted.

[0115] This invention discloses a one-click intelligent control method for automatic temperature correction during secondary adjustment of mill pulverizing. It includes the limiting logic for the upper and lower limits of the mill inlet temperature, the adjustment of the control method, the setting of page parameters, and the limiting logic and control method for the upper and lower limits of the mill outlet temperature. All pulverizing parameters are set based on the system's coal feed rate setting. The mill inlet temperature setting parameters primarily reflect the upper and lower limits required by the coal feed rate. This calibration mainly controls the braking temperature for adjusting the mill outlet temperature using the air-fuel ratio of the heat transfer medium, preventing excessive temperature lag during adjustment and resulting in excessive fluctuations, excessive increases, or excessive decreases in the mill outlet temperature. Adjustments are made when the mill outlet temperature is ≥ or ≤ the limit, and when the mill outlet temperature fluctuates outside the limit. After adjustment, if the temperature shows a trend of returning to within the limit, feedback is provided. The system monitors this feedback and sends it to the PLC program. The PLC program, according to the system's pre-set control logic, sets the mill outlet temperature to the system's set temperature. When the mill outlet temperature fluctuates, the system corrects accordingly. The upper and lower limits of the mill outlet temperature are set to four levels. The first and second levels are for air-fuel ratio control, and the third and fourth levels are for coal feed rate control.

[0116] When the first and second limiting triggers are triggered, the system controls the air-fuel ratio adjustment, primarily using gas flow rate and secondarily using combustion air. The mill outlet temperature is adjusted to the set value based on the flow rate value combined with lag time and number of adjustments. Once the air-fuel ratio is adjusted or when the system jumps to the third limiting trigger, the air-fuel ratio change returns to the set value. When the third and fourth limiting triggers are triggered, the system controls the coal feed rate adjustment, primarily using raw coal flow rate. The mill outlet temperature is adjusted to the set value based on the flow rate value combined with lag time and number of adjustments. Once the coal feed rate is adjusted, the coal feed change returns to the set value. If the mill temperature still does not return to the normal set value after the fourth limiting trigger, the system initiates a safety shutdown, which is not described in this document. The specific logic is as follows: When the mill outlet temperature is too high, and the mill outlet temperature is between the upper limit of the first and second channels, and the mill inlet temperature is not lower than the lower limit of the mill inlet temperature, the gas flow rate setting is reduced; when the mill outlet temperature is between the upper limit of the second and third channels, and the mill inlet temperature is not higher than the upper limit of the mill inlet temperature, the gas flow rate setting is further reduced; if the outlet temperature is too high (above the upper limit of the first channel), and the mill inlet temperature exceeds the upper limit, no gas adjustment is performed; if the mill outlet temperature is between the upper limit of the third and fourth channels or above the upper limit of the fourth channel, coal adjustment is performed to ensure that the mill outlet temperature is within the normal range.

[0117] When the mill outlet temperature is too low, and the mill outlet temperature is between the lower limits of the first and second stages, and the mill inlet temperature is not higher than the upper limit of the inlet temperature, the gas flow rate setting is increased. When the mill outlet temperature is between the lower limits of the second and third stages, and the mill inlet temperature is not higher than the upper limit of the inlet temperature, the gas flow rate setting is increased again. If the outlet temperature is too low (below the upper limit of the first stage), and the mill inlet temperature is below the lower limit, no gas regulation is performed. If the mill outlet temperature is between the lower limits of the third and fourth stages or below the lower limit of the fourth stage, coal reduction is performed to ensure that the mill outlet temperature is within the normal range. The air-fuel ratio or coal feed rate is automatically corrected. When the mill inlet temperature is between the upper and lower limits of the first stage, the air-fuel ratio and coal feed rate are automatically corrected to restore the air-fuel ratio and coal feed rate required for the current coal feed rate.

[0118] During the secondary adjustment process of the pulverizing system, this invention can automatically correct the stability of the mill outlet by adjusting the air-fuel ratio and braking the mill inlet temperature in advance, which can effectively control the temperature required for the mill outlet at the time of coal feed, and keep the mill outlet temperature within the temperature range required by the production process plant, so as to meet the requirements of subsequent injection process and blast furnace coal quality.

[0119] The advantages of this invention, as described in the second part, are a one-button pulverizing secondary temperature adjustment automatic correction intelligent control method. This method can control the mill outlet temperature during one-button pulverizing operation within the upper and lower limits required by the current coal feed rate, stabilizing the fluctuations in the mill outlet temperature caused by excessive adjustment of the mill inlet temperature. This invention uses a PLC program controlled by process logic, effectively controlling the required mill outlet temperature within ±4℃ without large data intervention or external factors affecting the system.

[0120] Advantages of the method of this invention:

[0121] 1. The one-click pulverizing host computer interface design parameter setting table includes the upper and lower limits of the mill inlet, the mill outlet temperature setting, and the coal feed rate setting. These settings can be linked and controlled by the background program to adjust the corresponding methods. All adjustments are based primarily on the currently set coal feed rate, with other settings being secondary. Other content irrelevant to this document will not be described.

[0122] 2. The limiting parameter for the mill inlet temperature is mainly a parameter set to control excessive adjustment of the mill outlet temperature. Since the mill inlet temperature is upstream of the mill outlet temperature, and the air-fuel ratio adjustment mechanism is also upstream of the mill inlet, adjusting the air-fuel ratio based on the mill outlet temperature will inevitably affect the mill outlet temperature. This invention, with its limiting parameter for the mill inlet, can initially and effectively set the required mill inlet temperature for the mill outlet temperature, preventing excessive adjustment of the air-fuel ratio and its impact on system temperature stability.

[0123] 3. The automatic correction method has a similar main control objective as point 2. Since the initial setting of the mill outlet temperature is based on the current coal feed rate, fluctuations in the heating medium or raw coal will affect the previously adjusted required mill outlet temperature. At this time, the PLC program will adjust according to the logic settings. Once the temperature is controlled during the adjustment process, the system displays a normal mill outlet temperature. However, both the air-fuel ratio adjustment and the raw coal adjustment are ahead of the mill outlet temperature, so the displayed mill outlet temperature is the result of the PLC program's first control. If the first control adjustment is not stable, the system will perform a second adjustment. However, there will be a lag in temperature display. When feedback of a recovery in the mill outlet temperature is detected during the first adjustment, the system automatically corrects the air-fuel ratio or coal feed rate to the initial setting parameters. The main purpose is to prevent excessive temperature fluctuations due to multiple adjustments.

[0124] 4. This invention mainly utilizes temperature adjustment during operation after one-button pulverization startup. Its advantages are mainly reflected in three aspects: first, the host computer parameter setting table; second, the method for limiting the mill inlet temperature parameter value; and third, the method for automatically correcting the air-fuel ratio and coal feed rate at the mill outlet temperature. These three methods can effectively stabilize the outlet temperature and ensure stable and smooth system operation.

[0125] The stability of the system temperature can bring significant benefits to the subsequent pulverized coal injection process. For example, the pulverized coal has good fluidity due to the stable temperature, and it will not cause blast furnace blockage, caking, or safety accidents. Most importantly, the stable temperature of the pulverized coal provides a significant reference for the overall fuel ratio in blast furnace smelting and reduces consumption.

[0126] Embodiments of the present invention also provide a one-button powder-making secondary temperature adjustment intelligent control system, comprising:

[0127] The acquisition module is used to determine the corresponding target value of the mill outlet temperature, the upper / lower limit value of the mill inlet temperature, and the initial gas flow rate value based on the set value of the coal feed rate; it monitors the mill outlet temperature in real time, and performs graded adjustments according to the deviation range when the temperature deviates from the target value.

[0128] The first judgment module is used when the temperature is too high. If the mill outlet temperature is between the upper limit of the first and second channels and the mill inlet temperature is greater than or equal to the lower limit of the inlet temperature, the gas flow rate setting value is reduced in stages, with a preset lag time for each adjustment. If the mill outlet temperature is between the upper limit of the second and third channels and the mill inlet temperature is less than or equal to the upper limit of the inlet temperature, the gas flow rate setting value is reduced in stages. If the mill outlet temperature is between the upper limit of the third and fourth channels, the coal feed rate setting value is increased in stages.

[0129] The second judgment module is used when the temperature is too low. If the mill outlet temperature is between the first and second lower limits and the mill inlet temperature is less than or equal to the upper limit of the inlet temperature, the gas flow rate setting value is increased in stages. If the mill outlet temperature is between the second and third lower limits and the mill inlet temperature is less than or equal to the upper limit of the inlet temperature, the gas flow rate setting value is increased in stages. If the mill outlet temperature is between the third and fourth lower limits, the coal feed rate setting value is decreased in stages.

[0130] The recovery module is used to restore the gas flow rate setpoint and coal feed rate setpoint to their initial values ​​when the mill outlet temperature is detected to have returned to the target range.

[0131] The execution module is used to pause the automatic correction function until the temperature recovers when the adjustment action moves from the second limit range to the third limit range.

[0132] The above description represents the preferred embodiments of the present invention. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A one-key intelligent control method for powder making and secondary temperature regulation, characterized in that, The method includes: Determine the corresponding target value of mill outlet temperature, upper / lower limit value of mill inlet temperature, and initial gas flow rate value based on the set value of coal feed rate; Real-time monitoring of the mill outlet temperature; when the temperature deviates from the target value, tiered adjustments are implemented based on the magnitude of the deviation. When the mill outlet temperature is too high, and the mill outlet temperature is between the upper limits of the first and second channels, and the mill inlet temperature is not lower than the lower limit of the mill inlet temperature, reduce the gas flow rate setting. When the mill outlet temperature is between the upper limits of the second and third channels, and the mill inlet temperature is not higher than the upper limit of the mill inlet temperature, continue to reduce the gas flow rate setting. If the outlet temperature is too high and the mill inlet temperature exceeds the upper limit, no gas adjustment is performed. If the mill outlet temperature is between the upper limits of the third and fourth channels or above the upper limit of the fourth channel, coal adjustment is performed. When the mill outlet temperature is too low, and the mill outlet temperature is between the lower limits of the first and second channels, and the mill inlet temperature is not higher than the upper limit of the inlet temperature, increase the gas flow rate setting. When the mill outlet temperature is between the lower limits of the second and third channels, and the mill inlet temperature is not higher than the upper limit of the inlet temperature, continue to increase the gas flow rate setting. If the outlet temperature is too low and the mill inlet temperature is below the lower limit, no gas adjustment is performed. If the mill outlet temperature is between the lower limits of the third and fourth channels or below the lower limit of the fourth channel, coal reduction is performed. When the mill outlet temperature is monitored to return to the target range, the gas flow rate setpoint and coal feed rate setpoint are restored to their initial values. When the adjustment action moves from the second limit range to the third limit range, the automatic correction function is paused until the temperature recovers; if the mill outlet temperature is between the first and second lower limits, and the mill inlet temperature is ≤ the upper limit of the inlet temperature, the gas flow rate setpoint is increased in stages; if the mill outlet temperature is between the third and fourth lower limits, the coal feed rate setpoint is decreased in stages, including: Perform the same phased adjustment procedure as the first lower limit interval: Increase the gas flow rate setting and wait for the lag time; if the temperature does not rise, increase the gas flow rate setting again. Add real-time inlet temperature constraints: Before each adjustment, it is necessary to verify that the mill inlet temperature is less than or equal to the upper limit of the inlet temperature. If it exceeds the limit, skip this adjustment. If the temperature drops to between the third and fourth lower limits after adjustment, immediately stop the gas adjustment and switch to the coal feed rate adjustment. When the mill outlet temperature is between the lower limits of the third and fourth stages, the coal feed rate setpoint is reduced in stages, including: Implement a coal feed rate control process independent of gas regulation: Reduce the coal feed rate setting and wait for the lag time; if the temperature does not rise, reduce the coal feed rate setting again. Forced reset of air-fuel ratio: During the initial adjustment of the coal feed rate, the gas flow rate setpoint is restored to its initial value. If the temperature returns to the target range after the second adjustment, the coal feed rate setpoint is restored to its initial value. If it is still below the fourth lower limit, a safety shutdown is triggered.

2. The one-key intelligent control method for pulverizing and secondary adjusting temperature according to claim 1, characterized in that, Based on the setpoint for coal feed rate, determine the corresponding target value for mill outlet temperature, upper / lower limit value for mill inlet temperature, and initial gas flow rate, including: Obtain the reference parameter set that matches the current coal feed setting value through the preset parameter mapping table: Mill outlet temperature target value = fixed temperature value corresponding to this coal feed rate range; Mill inlet temperature upper limit value = the highest allowable inlet temperature for this coal feed rate range; Mill inlet temperature lower limit value = the lowest allowable inlet temperature for this coal feed rate range; Initial gas flow rate value = preset standard gas flow rate for this coal feed rate range; Calculation of flow change in staged regulation: The change in gas flow rate for each adjustment is equal to the single adjustment threshold corresponding to the coal feed rate range in the parameter mapping table. The change in coal feed rate for each adjustment is equal to the single coal feed rate adjustment threshold corresponding to the coal feed rate range in the parameter mapping table. Lag time setting: The execution interval between two adjacent adjustment actions is equal to the preset lag time value in the parameter mapping table. Adjustment frequency control: The maximum number of adjustments within the same grade interval is equal to the preset allowable number of adjustments in the parameter mapping table.

3. The one-key intelligent control method for pulverizing and secondary adjusting temperature according to claim 2, characterized in that, If the mill outlet temperature is between the upper limit of the first stage and the upper limit of the second stage, and the mill inlet temperature is greater than or equal to the lower limit of the inlet temperature, then the gas flow rate setpoint will be reduced in stages, with a preset lag time between each adjustment, including: Reduce the current gas flow rate setpoint to the single adjustment threshold, and monitor the temperature change after waiting for the lag time. Trend judgment: If the mill outlet temperature is detected to be decreasing and the third upper limit is not triggered, continue to wait until the temperature returns to the target range; if the temperature does not decrease within the lag time, perform a second adjustment. Secondary adjustment: Reduce the gas flow rate setpoint again to the single adjustment threshold, and monitor the temperature change after waiting for the lag time; Corrected execution: If the temperature returns to the target range, immediately restore the gas flow rate setting to its initial value; If the temperature remains between the first and second upper limits after the second adjustment, then maintain the current gas flow rate setting. If the temperature rises to between the second and third upper limits after the second adjustment, the correction function will be paused and the next level of adjustment will begin.

4. The one-key intelligent control method for pulverizing and secondary adjusting temperature according to claim 3, characterized in that, If the mill outlet temperature is between the first and second lower limits, and the mill inlet temperature is less than or equal to the upper limit of the inlet temperature, then the gas flow rate setpoint should be increased in stages, including: Increase the current gas flow rate setpoint by the single adjustment threshold, and monitor the temperature change after waiting for the lag time. If the mill outlet temperature is detected to be rising and the third lower limit is not triggered, continue to wait until the temperature returns to the target range; if the temperature does not rise within the lag time, perform a second adjustment. The gas flow rate setpoint is increased again by the single adjustment threshold; If the temperature returns to the target range after any step, immediately restore the gas flow rate setting to the initial value; if the temperature is still between the first and second lower limits after the second adjustment, maintain the current gas flow rate setting. If the temperature drops to between the second and third lower limits after the second adjustment, the correction function will be paused and the next level of adjustment will begin.

5. The intelligent control method for one-button powder milling with secondary temperature adjustment according to claim 4, characterized in that, When the mill outlet temperature is monitored to return to the target range, the gas flow rate setpoint and coal feed rate setpoint are restored to their initial values, including: The mill outlet temperature has remained stable within the target range for more than the preset stabilization time and is not currently in a cross-stage regulation interruption state. Reset the gas flow rate setting to the initial gas flow rate value corresponding to the current coal feed rate in the parameter mapping table; reset the coal feed rate setting to the original coal feed rate setting; if the emergency shutdown procedure has been triggered, disable this correction operation.

6. A one-button powder-making secondary temperature adjustment intelligent control system, wherein the system implements the method as described in any one of claims 1 to 5, characterized in that, include: The acquisition module is used to determine the corresponding target value of mill outlet temperature, upper / lower limit value of mill inlet temperature and initial gas flow rate value based on the set value of coal feed rate; Real-time monitoring of the mill outlet temperature; when the temperature deviates from the target value, tiered adjustments are implemented based on the magnitude of the deviation. When the mill outlet temperature is too high, and the mill outlet temperature is between the upper limits of the first and second channels, and the mill inlet temperature is not lower than the lower limit of the mill inlet temperature, reduce the gas flow rate setting. When the mill outlet temperature is between the upper limits of the second and third channels, and the mill inlet temperature is not higher than the upper limit of the mill inlet temperature, continue to reduce the gas flow rate setting. If the outlet temperature is too high and the mill inlet temperature exceeds the upper limit, no gas adjustment is performed. If the mill outlet temperature is between the upper limits of the third and fourth channels or above the upper limit of the fourth channel, coal adjustment is performed. When the mill outlet temperature is too low, and the mill outlet temperature is between the lower limits of the first and second channels, and the mill inlet temperature is not higher than the upper limit of the inlet temperature, increase the gas flow rate setting. When the mill outlet temperature is between the lower limits of the second and third channels, and the mill inlet temperature is not higher than the upper limit of the inlet temperature, continue to increase the gas flow rate setting. If the outlet temperature is too low and the mill inlet temperature is below the lower limit, no gas adjustment is performed. If the mill outlet temperature is between the lower limits of the third and fourth channels or below the lower limit of the fourth channel, coal reduction is performed. The recovery module is used to restore the gas flow rate setpoint and coal feed rate setpoint to their initial values ​​when the mill outlet temperature is detected to have returned to the target range. The execution module is used to pause the automatic correction function until the temperature recovers when the adjustment action moves from the second limit range to the third limit range.

7. A computing device, comprising: include: One or more processors; A storage device for storing one or more programs, which, when executed by one or more processors, cause the one or more processors to implement the method as described in any one of claims 1 to 5.

8. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores a program that, when executed by a processor, implements the method as described in any one of claims 1 to 5.

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