CN-121760960-B - Colliery ventilation intelligent regulation and control system based on PLC double fan cooperative control

CN121760960BCN 121760960 BCN121760960 BCN 121760960BCN-121760960-B

Abstract

The invention discloses a coal mine ventilation intelligent regulation and control system based on PLC double-fan cooperative control, and relates to the technical field of fan ventilation regulation and control. The system establishes a foundation for real-time sharing and seamless connection of data by combining mine equivalent ventilation impedance derived by a working analysis module and dynamically determined standby fan coupling starting parameters, dynamically adjusts the standby fan parameters by a double-fan cooperation module based on the frequency reduction amplitude of a main fan, ensures smooth connection of the running states of the main fan and the standby fan, avoids parameter faults when connection is performed, accurately calculates comprehensive balance errors by using frequency deviation and double-path wind pressure difference values, and provides real-time optimization basis for automatic adjustment of an air door by combining air door pressure sensor signals. The high-efficiency data sharing and seamless connection pipe control of the two sets of PLC are realized, the automatic adjustment of the air door pressure sensor is more targeted, and finally, the fact that the whole switching process of the main fan and the standby fan is continuous and the underground wind pressure is always stable is ensured.

Inventors

LIU ZHILI
JIANG YIFAN
WANG XIONG
LI JIANWEI
WANG BO
XUE LIJUN

Assignees

内蒙古满世煤炭集团罐子沟煤炭有限责任公司

Dates

Publication Date: 20260512
Application Date: 20260302

Claims (8)

1. Colliery ventilation intelligent regulation and control system based on two fans cooperative control of PLC, its characterized in that includes: The combined work analysis module is used for analyzing the frequency of the main fan, the opening degree of the air door and the wind pressure of the main fan through the PLC to obtain the equivalent ventilation impedance of the mine, taking the equivalent ventilation impedance of the mine as a feedforward condition and dynamically determining the coupling starting frequency of the standby fan and the opening degree of the air door of the standby fan with the aim of maintaining the reference wind quantity of the main return airway of the mine; the double-fan cooperative module is used for enabling the standby fan to start at the coupling starting frequency through the PLC controller, and adjusting the coupling starting frequency of the standby fan and the opening of an air door of the standby fan based on the determined frequency descending amplitude of the main fan; The feedback adjustment module is used for determining a comprehensive balance error by utilizing the frequency deviation of the main fan and the standby fan and the double-path wind pressure difference value in the double-fan cooperation process, and adjusting the fan frequency and the opening of a fan air door based on the comprehensive balance error so as to enable the frequency deviation of the main fan and the standby fan and the double-path wind pressure difference value to tend to be minimum; the switching state judging module is used for judging that the air quantity power switching is completed when the main control PLC enables the frequency of the main fan to be reduced to the lower limit and the comprehensive balance error is continuously lower than a set threshold value; The process for determining the comprehensive balance error by utilizing the frequency deviation of the main fan and the standby fan and the double-path wind pressure difference value comprises the following steps: Calculating the difference value between the actual frequency of the main fan and the target down-conversion frequency, and the difference value between the updated frequency of the standby fan and the target coupling frequency to obtain the frequency deviation of the main fan and the standby fan; calculating the difference value between the actual wind pressure of the main fan and the target wind pressure of the main fan, and the difference value between the actual wind pressure of the standby fan and the target wind pressure of the standby fan to obtain a double-path wind pressure difference value; Combining the frequency deviation and the double-path wind pressure difference value to obtain a deviation vector, normalizing elements in the deviation vector, taking absolute values, and carrying out weighted summation on the four absolute values to obtain a comprehensive balance error; based on the comprehensive balance error, the fan frequency and the opening of a fan air door are adjusted, so that the frequency deviation of the main fan and the standby fan and the double-path wind pressure difference tend to be minimum are as follows: Determining the frequency of the fan and the adjustment direction of the opening of the air door of the fan according to the frequency deviation of the main fan and the standby fan and the deviation vector obtained by the double-path air pressure difference value; synchronously adjusting the actual frequency of the main fan and the updated frequency of the standby fan according to the corresponding adjusting direction based on the frequency adjusting step length, and calculating the sum of absolute values of frequency deviations of the main fan and the standby fan after each synchronous adjustment; After the actual frequency of the main fan and the updated frequency of the standby fan are adjusted each time, synchronously adjusting the opening of the air door of the main fan and the opening of the air door of the standby fan based on the opening adjusting step length until the maximum allowable adjusting amount is adjusted; Calculating the sum of absolute values of two-way wind pressure difference values after synchronously adjusting the opening of the main fan air door and the opening of the standby fan air door each time; and determining the actual frequency of the main fan after adjustment, the updated frequency of the standby fan, the opening degree of a main fan air door and the opening degree of a standby fan air door, which enable the sum of the absolute values of the frequency deviation and the sum of the absolute values of the two-way wind pressure difference to be minimum, and taking the actual frequency, the updated frequency, the opening degree of the main fan air door and the opening degree of the standby fan air door as final adjusted states.
2. The intelligent regulation and control system for coal mine ventilation based on the cooperative control of the PLC double fans according to claim 1, wherein the process of analyzing the frequency of the main fan and the wind pressure of the main fan by the PLC to obtain the equivalent ventilation impedance of the mine is as follows: Acquiring the frequency of a real-time main fan real-time throttle opening and real-time main fan wind pressure; Determining a theoretical wind pressure expected value corresponding to the current main fan frequency and the opening degree of an air door according to a factory characteristic curve and field calibration data of the main fan, wherein the theoretical wind pressure expected value is a calibration value; Calculating the absolute value of the difference between the wind pressure of the main fan and the theoretical wind pressure expected value, and taking the absolute value as the total pressure loss value of the system; Calculating the ratio of the total pressure loss value of the system to the real-time air quantity of the main fan to obtain a unit air quantity resistance coefficient; inquiring a corresponding theoretical unit air quantity resistance coefficient range from a preset database according to the current frequency of the main fan and the opening degree of the air door; Judging whether the unit air quantity resistance coefficient is within the theoretical unit air quantity resistance coefficient range, if not, judging a ventilation abnormal state; If so, calculating the median value of the theoretical unit air volume resistance coefficient range, and carrying out weighted summation on the median value and the unit air volume resistance coefficient according to preset weight to obtain the equivalent ventilation impedance of the mine.
3. The intelligent regulation and control system for ventilation of coal mine based on the cooperative control of the PLC double fans according to claim 1, wherein the process of determining the coupling starting frequency of the standby fans and the opening degree of the air door of the standby fans is carried out by taking the equivalent ventilation impedance of the mine as a feedforward condition with the aim of maintaining the reference air quantity of the total return air lane of the mine: determining the air quantity of the standby fan, and multiplying the air quantity of the standby fan by the equivalent ventilation impedance of the mine to obtain the pressure loss value of the standby fan; performing adaptive judgment on the frequency and air door opening combination of the standby fan to be selected, so that the difference between the theoretical wind pressure expected value and the standby fan pressure loss value of the corresponding combination is equal to the current wind pressure of the standby fan; taking the screened optimal combined standby fan frequency as the coupling starting frequency of the standby fan; And taking the screened air door opening of the optimal combination as the air door opening of the standby fan.
4. The intelligent regulation and control system for ventilation of coal mine based on cooperative control of two fans of PLC as claimed in claim 3, wherein the process of performing adaptive judgment on the combination of the frequency of the standby fan to be selected and the opening degree of the air door is as follows: Sequencing the frequencies of the standby fans of all the combinations from low to high, and selecting the combination with the lowest frequency value of the standby fans; If a plurality of combinations with the same frequency value of the standby fans exist, sequencing the opening adjustment amplitude of the air door of the combination from small to large, and selecting the combination with the minimum opening adjustment amplitude of the air door as the optimal combination.
5. The intelligent regulation and control system for ventilation of coal mine based on cooperative control of two fans of PLC as claimed in claim 3, wherein the process of determining the air quantity of the standby fan is as follows: If the main fan air quantity is smaller than the reference air quantity, the standby fan air quantity value is the difference value of the reference air quantity minus the main fan air quantity, and if the main fan air quantity is equal to the reference air quantity, the standby fan air quantity value is the difference value of the set safe air quantity maximum value minus the main fan air quantity.
6. The intelligent regulation and control system for coal mine ventilation based on the cooperative control of the PLC double fans according to claim 1 is characterized in that the process of determining the frequency drop amplitude of the main fan is as follows: Presetting a plurality of different single frequency falling amplitudes through a PLC (programmable logic controller), and respectively analyzing and pre-judging historical variation of equivalent ventilation impedance of the mine after the single frequency falling amplitudes are executed by the main fan according to each single frequency falling amplitude; And selecting the single frequency descending amplitude of the mine equivalent ventilation impedance, which can be quickly stabilized within the preset stabilizing time, from the single frequency descending amplitude corresponding to the historical variable quantity which never exceeds the mine equivalent ventilation impedance change threshold value, and taking the single frequency descending amplitude as the main fan frequency descending amplitude.
7. The intelligent regulation and control system for ventilation of coal mine based on the cooperative control of the two fans of the PLC as claimed in claim 1, wherein the process of adjusting the coupling start frequency of the standby fan and the opening degree of the air door of the standby fan based on the determined frequency decrease amplitude of the main fan is as follows: After the main fan downwards regulates the frequency of the main fan according to the descending amplitude of the frequency of the main fan every time, taking the difference value between the reference air quantity and the residual ventilation quantity of the main fan as the ventilation quantity required by the standby fan; after the equivalent ventilation impedance of the mine is stable, multiplying the equivalent ventilation impedance by the ventilation quantity required by the standby fan to obtain the updated pressure loss value of the standby fan; and screening the matched updated frequency of the spare fan and the updated air door opening of the spare fan based on the updated pressure loss value of the spare fan, and replacing the coupling starting frequency and the air door opening of the spare fan.
8. The intelligent regulation and control system for coal mine ventilation based on the PLC double-fan cooperative control according to claim 1, wherein the process of determining the fan frequency and the adjustment direction of the opening of the fan air door according to the deviation vector obtained by the frequency deviation of the main fan and the standby fan and the double-path air pressure difference value is as follows: If the deviation corresponding to the frequency is positive, the fan frequency is adjusted to the lowering direction, and if the deviation corresponding to the frequency is negative, the fan frequency is adjusted to the lifting direction; if the corresponding deviation of the wind pressure of the fan is positive, the opening of the air door is adjusted to the increasing direction; if negative, the throttle opening is adjusted in the decreasing direction.

Description

Colliery ventilation intelligent regulation and control system based on PLC double fan cooperative control Technical Field The invention relates to the technical field of ventilation regulation and control of fans, in particular to an intelligent regulation and control system for ventilation of a coal mine based on cooperative control of two fans of a PLC (programmable logic controller). Background The continuous wind and wind pressure stable control during the switching of the main blower and the standby blower depends on the real-time data sharing and seamless connection capability of two sets of PLC control systems, however, in the actual coal mine ventilation scene, factors such as the fluctuation of the running load of the blower, the dynamic change of the resistance of the ventilation network and the like objectively exist, and the prior art scheme has the defects that firstly, the two sets of PLC control systems in the prior art lack unified ventilation network resistance quantification standard, and lack accurate quantification and sharing of core commonality parameters such as the equivalent ventilation resistance of a mine, and cannot form unified judgment standard for cooperative control. Secondly, the existing scheme does not design a parameter self-adaptive adjustment mechanism aiming at the dynamic transition process of the switching of the main fan and the standby fan, so that seamless connection of control authority is difficult to realize, and air volume gap or redundancy caused by parameter fault is easy to occur. Finally, the existing air door automatically adjusts the resistance change of the unbonded ventilation network and the running state of the main and standby fans to carry out linkage adaptation, so that the instantaneous wind pressure disturbance in the switching process cannot be accurately counteracted. Therefore, an intelligent regulation and control system with unified resistance quantification standard, dynamic parameter self-adaptive optimization and fan and air door linkage regulation functions is needed to solve the technical bottleneck, realize real-time data sharing and seamless connection of two sets of PLC control systems, and ensure that the wind flow is continuous and the underground wind pressure is stable all the time when the main fan and the standby fan are switched. Disclosure of Invention Aiming at the defects of the prior art, the invention provides an intelligent regulation and control system for coal mine ventilation based on the cooperative control of a PLC double fan, which solves the problems that the prior art is difficult to share data in real time, the air door is not automatically adjusted to switch by using a pressure sensor signal at the air door, and the air break or the air pressure is unstable. The intelligent regulation and control system for the coal mine ventilation based on the PLC double-fan cooperative control comprises a joint work analysis module, a main fan frequency, an air door opening and a main fan wind pressure are analyzed through a PLC controller to obtain mine equivalent ventilation impedance, the mine equivalent ventilation impedance is used as a feedforward condition aiming at maintaining the reference wind quantity of a main return air lane of a mine, and the coupling starting frequency of a standby fan and the air door opening of the standby fan are dynamically determined. And the double-fan cooperation module is used for enabling the standby fan to start at the coupling starting frequency through the PLC controller, and adjusting the coupling starting frequency of the standby fan and the opening of the air door of the standby fan based on the determined frequency descending amplitude of the main fan. And the feedback adjustment module is used for determining a comprehensive balance error by utilizing the frequency deviation of the main fan and the standby fan and the double-path wind pressure difference value in the double-fan cooperation process, and adjusting the fan frequency and the opening of the fan air door based on the comprehensive balance error so as to enable the frequency deviation of the main fan and the standby fan and the double-path wind pressure difference value to tend to be minimum. And the switching state judging module is used for judging that the air quantity power switching is completed when the main control PLC enables the frequency of the main fan to be reduced to the lower limit and the comprehensive balance error is continuously lower than the set threshold value. Compared with the prior art, the method has the advantages that the mine equivalent ventilation impedance deduced by the joint work analysis module and the dynamically determined standby fan coupling starting parameters are completely consistent, the control judgment standards of the two sets of PLCs are completely consistent, a foundation is laid for real-time sharing and seamless connection of data, the standby fan parameters are dynam