Multi-stage drainage collaborative control method based on water inflow prediction

Abstract

The present application relates to coal mine drainage monitoring system technical field, disclose a kind of multistage drainage collaborative control method based on water inflow prediction, comprising the following steps:1) obtain current time, and according to the parameter set, determine the peak valley section where current time is located;2) obtain the water level of current water warehouse;3) according to the water inflow rate of unit time in current water warehouse, and predict the water inflow in this peak valley period;4) according to the peak valley period where it is located, calculate the number of water pump required to be started;5) superimposed calculation the number of water pump required to be started in advance corresponding to the drainage capacity of lower pump house that has been started;6) in combination with the water level situation of upper pump house and this level pump house, judge whether to allow drainage.The present application reads the water level of each water warehouse and other important operating data, in combination with the current state of upper and lower pump house, gives the signal of allowing or prohibiting the drainage of this level pump house, and then realizes the linkage control between each level pump house, to ensure the operation of the entire coal mine underground drainage system under the condition of safety and stability.

Description

Technical Field

[0001] This invention relates to the field of coal mine drainage monitoring systems, and in particular to a multi-level drainage collaborative control method based on water inflow prediction. Background Technology

[0002] While existing underground pump station drainage systems in coal mines have largely achieved semi-automation or automation through upgrades, reducing the workload of workers, the monitoring systems of each pump station operate independently, with no data exchange between multiple pump stations. This makes it difficult to scientifically and rationally schedule drainage volume and timing, and there is a lack of coordinated control and joint scheduling between pump stations. Improper control can easily lead to pump station overflow accidents, causing damage to equipment and property at best, and threatening the lives of underground workers at worst.

[0003] Meanwhile, existing pump station drainage systems primarily use the traditional high and low water level method to control the start and stop of water pumps. Water level sensors collect data from the water tank, classifying it into low, high, and extra-high levels. When the water level reaches the high level, a set number of pumps are activated, stopping when the water level reaches the low level; conversely, when the water level reaches the extra-high level, all pumps are activated. While this method achieves automatic drainage, it ignores the changing flow of water in the well over time. A sudden and significant change in the flow could potentially cause a drainage safety accident. Summary of the Invention

[0004] The technical problem to be solved by the first aspect of the present invention is to provide a multi-level drainage coordinated control method based on water inflow prediction, which can control the water level of the water tank between low water level and ultra-high water level, and ensure that the entire underground drainage system of the coal mine operates under safe and stable conditions.

[0005] To address the aforementioned technical problems, the first aspect of this invention provides a multi-stage drainage coordinated control method based on inflow volume prediction, comprising the following steps:

[0006] 1) Obtain the current time and determine the peak / valley segment where the current time is located based on the set parameters;

[0007] 2) Obtain the current water level in the reservoir;

[0008] 3) Based on the current water inflow rate per unit time in the reservoir, predict the water inflow during this peak-valley period;

[0009] 4) Calculate the number of water pumps that need to be turned on based on the peak and valley periods;

[0010] 5) Calculate the number of pumps that need to be turned on in advance, corresponding to the drainage volume already started by the lower-level pumping station;

[0011] 6) Determine whether drainage is permitted by combining the water levels of the upstream pumping station and the pumping station at this level.

[0012] Preferably, the water level in the water tank includes three levels: ultra-high water level H. HH High water level H H and low water level H L ,

[0013] When the water level is at the extremely high water level H HH At that time, the total water volume held by the reservoir is Q. HH ;

[0014] When the water level is at a high level H H At that time, the total water volume held by the reservoir is Q. H ;

[0015] When the water level is at a low level H L At that time, the total water volume held by the reservoir is Q. L .

[0016] More preferably, the total water volume that the water tank can actually hold is Q. now Q t The flow rate per unit time corresponds to the flow volume Q. t = Equivalent area of ​​the water tank × water flow rate per unit time.

[0017] More preferably, in step 4), when the electricity consumption is at its lowest point, it is suitable to control the water level in the water tank at a low water level H. L .

[0018] Preferably, when the electricity consumption period is in a low-demand period, the total time from the current time to the end of the low-demand period is t1 hours, and the water inflow during t1 hours is Q1 = Q t ×t1, obtain the water volume exceeding the low water level at the current time as Q0, and calculate the total water volume that needs to be discharged before the peak arrives at the end of the valley segment as Q. all =Q1+Q0, the displacement of each pump is q(m 3 / h), then the number of pumps that need to be started is qt1 represents the drainage volume of each pump during the remaining time t1.

[0019] More preferably, in step 4), when the electricity consumption period is peak, it is suitable to control the water level in the water tank at the ultra-high water level H. HH .

[0020] Preferably, when in the peak period, the total time from the current time to the end of the peak period is t2 hours, and the water inflow during t2 hours is Q2 = Q t ×t2, obtain the water volume Q in the water tank at the time of detection. now The maximum amount of water that can be contained before the end of the peak period is calculated to be Q. Δ2 =Q HH-Q NOW ,

[0021] When Q2≤Q Δ2 At that time, the water pump should not be turned on;

[0022] When Q2 > Q Δ2 If the water pumps are not turned on, the water level in the reservoir will exceed the high water level line. At this time, the displacement of each water pump in this stage is q(m³). 3 / h), then the number of pumps that need to be started is qt2 represents the drainage volume of each pump during the remaining time t2.

[0023] Preferably, in step 4), when the time period is in a flat period, the flat period includes: when the next time period is a valley period, it is suitable to control the water level in the water tank at a high water level H. H When the next period is a peak period, it is appropriate to control the water level in the water tank at a low water level H. L .

[0024] Preferably, when the next time period is a valley period, the predicted inflow rate within t3 hours from the start of the current time period to the end of the flat period is Q3 = Q t *t3, the amount of water in the reservoir during the current time period is Q. NIW The maximum amount of water that can be accommodated before the end of the leveling section is calculated to be Q. Δ3 =Q H -Q NOW ,

[0025] If Q3≤Q Δ3 If so, the water pump will not be turned on;

[0026] If Q3>Q Δ3 If the water pump is not turned on, the water level in the reservoir will exceed the high water level line H. H At this point, the water tank needs to be drained, and the discharge capacity of each water pump is q(m³). 3 / h), then the number of pumps that need to be started is qt3 represents the drainage volume of each pump during the remaining time t3.

[0027] More preferably, when the next time period is a peak period, the predicted inflow rate within t4 hours from the start of the current time period to the end of the flat period is Q4 = Q t *t4, the water volume exceeding the low water level line during detection is Q0, and the total water volume that needs to be discharged before the peak arrives is calculated to be Q. all =Q4 + Q0, the displacement of each water pump is q(m 3 / h), then the number of pumps that need to be started is qt4 represents the drainage volume of each pump during the remaining time t4.

[0028] Through the above-mentioned preferred technical solutions, the multi-level drainage coordinated control method based on inflow prediction of the present invention reads important operational data such as the water level of each water tank, combines the current status of the upper and lower level pump stations, and gives a signal to allow or prohibit the drainage of the current level pump station, so as to ensure the orderly operation of drainage of each level pump station, thereby realizing the linkage control between each level pump station; at the same time, the inflow prediction is used to determine the start and stop timing of the pump group composed of water pumps and the number of drainage pump groups, and controls the water level of the water tank between low water level and ultra-high water level, so as to ensure the safe and stable operation of the entire coal mine underground drainage system.

[0029] Other features and advantages of the present invention will be described in detail in the following detailed description section. Attached Figure Description

[0030] Figure 1 This is a schematic diagram showing the connection between multiple pumping stations in a multi-level drainage coordinated control method based on inflow prediction, which is a specific embodiment of the present invention.

[0031] Figure 2 This is a schematic diagram illustrating the workflow of the multi-level drainage coordinated control method based on inflow prediction, which is a specific embodiment of the present invention.

[0032] Figure 3 A schematic diagram illustrating the connection between multiple controllers in the multi-level drainage coordinated control method based on inflow prediction according to a specific embodiment of the present invention.

[0033] Explanation of reference numerals in the attached figures:

[0034] 1. Pump station terminal controller; 2. Coordination controller. Detailed Implementation

[0035] The specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0036] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "setting," and "connection" should be interpreted broadly. For example, the term "connection" can refer to a fixed connection, a detachable connection, or an integral connection; it can be a direct connection or an indirect connection through an intermediate medium; it can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0037] refer to Figures 1 to 3 A multi-stage drainage coordinated control method based on inflow prediction, according to a specific embodiment of the present invention, includes the following steps:

[0038] 1) Obtain the current time and determine the peak / valley segment where the current time is located based on the set parameters;

[0039] 2) Obtain the current water level in the reservoir;

[0040] 3) Based on the current water inflow rate per unit time in the reservoir, predict the water inflow during this peak-valley period;

[0041] 4) Calculate the number of water pumps that need to be turned on based on the peak and valley periods;

[0042] 5) Calculate the number of pumps that need to be turned on in advance, corresponding to the drainage volume already started by the lower-level pumping station;

[0043] 6) Determine whether drainage is permitted by combining the water levels of the upstream pumping station and the pumping station at this level.

[0044] Specifically, first, the current time period is determined, and the peak and trough segments of the current time are identified. Then, the current water level in the reservoir is monitored. The current water level in the reservoir is divided into at least three levels: extremely high water level H. HH High water level H H and low water level H L When the water level is at an extremely high level H HH At that time, the total water volume held by the reservoir is Q. HH When the water level is at a high level H H At that time, the total water volume held by the reservoir is Q. H When the water level is at a low level H L At that time, the total water volume held by the reservoir is Q. L And the total amount of water that the current water tank can actually hold is Q. now Q t The flow rate per unit time corresponds to the flow volume Q. t = Equivalent area of ​​the water tank × water flow rate per unit time.

[0045] See Figure 2 The following section details the calculation of the number of water pumps required to be turned on during peak and off-peak periods.

[0046] During periods of low electricity consumption, the water level in the water tank needs to be controlled at a low level H. L Nearby. The valley is followed by a peak, so during the valley, the water level in the reservoir needs to be lowered as much as possible to leave more reservoir capacity for the peak. Therefore, when the required number of pumps to be turned on is during the valley, the total time from the current time to the end of the valley is t1 hours, and the inflow within t1 hours is Q1 = Q. t ×t1, obtain the water volume exceeding the low water level at the current time as Q0, and calculate the total water volume that needs to be discharged before the peak arrives at the end of the valley segment as Q. all=Q1+Q0, the displacement of each pump is q(m 3 / h), then the number of pumps that need to be turned on is qt1 represents the drainage volume of each pump during the remaining time t1.

[0047] During peak electricity consumption periods, it is suitable to control the water level in the water tank at the ultra-high water level H. HH During peak periods, maximize the use of water tank capacity and minimize pump activation. During peak periods, the total time from the current time to the end of the peak period is t2 hours. The water inflow during t2 hours is Q2 = Q t ×t2, obtain the water volume Q in the water tank at the time of detection. now The maximum amount of water that can be contained before the end of the peak period is calculated to be Q. Δ2 =Q HH -Q NOW ,

[0048] When Q2≤Q Δ2 At that time, the water pump should not be turned on;

[0049] When Q2 > Q Δ2 If the water pumps are not turned on, the water level in the reservoir will exceed the high water level line. At this time, the displacement of each water pump in this stage is q(m³). 3 / h), then the number of pumps that need to be turned on is qt2 represents the drainage volume of each pump during the remaining time t2.

[0050] In addition, when in a flat period, there are two possibilities: the next period is a trough or the next period is a peak.

[0051] When the next time period is a valley period, the predicted inflow rate for the t3-hour period from the start of the current time period to the end of the flat period is Q3 = Q. t *t3, the amount of water in the reservoir during the current time period is Q. NOW The maximum amount of water that can be accommodated before the end of the leveling section is calculated to be Q. Δ3 =Q H -Q NOW ,

[0052] If Q3≤Q Δ3 If the water pump is not turned on, the water level can be maintained below the high water level to ensure that there is enough water storage capacity to drain water during the off-peak electricity period.

[0053] If Q3>Q Δ3 If the water pump is not turned on, the water level in the tank will exceed the high water level line H. H At this point, the water tank needs to be drained, and the discharge capacity of each water pump is q(m³). 3 / h), then the number of pumps that need to be turned on is qt3 represents the drainage volume of each pump during the remaining time t3.

[0054] When the next peak period arrives, as much water as possible needs to be drained to free up water tank capacity for the next peak period and reduce drainage pressure during that peak. At this time, the water level in the tank should be controlled at the low water level H. L At this point, the predicted inflow rate for the t4-hour period from the start of the current time period to the end of the flat period is obtained as Q4 = Q t *t4, the water volume exceeding the low water level line during detection is Q0, and the total water volume that needs to be discharged before the peak arrives is calculated to be Q. all =Q4 + Q0, the displacement of each water pump is q(m 3 / h), then the number of pumps that need to be turned on is qt4 represents the drainage volume of each pump during the remaining time t4.

[0055] Although the above method for estimating the number of pumps to be started based on inflow prediction already includes the impact of drainage from lower-level pumping stations on the water level and rate of change of the current pumping station, the lag in changes in water level-related values ​​will cause a delay in the predicted number of pumps to be started. Therefore, it is necessary to add the number of pumps in the current pumping station that matches the discharge capacity of the pumps already started in the lower-level pumping station to the initially calculated number of pumps to be started. Let the total discharge capacity of the pumps already started in the lower-level pumping station be Q. x (m 3 / h), combined with the displacement q(m) of a single pump unit in this stage 3 / h), then the maximum number of pumps that can be turned on ahead of schedule in this stage is

[0056] In addition, the final number of water pumps that need to be turned on is calculated to be N+N. Fc Based on a comprehensive assessment of the water levels at both the local and upstream levels, if the water level at the upstream pumping station is not in the high water level range and the local pumping station predicts that the pumps need to be turned on, then the pumps are permitted to be turned on. If the water level at the upstream pumping station is in the high water level range and the local pumping station predicts that the pumps need to be turned on, but the local pumping station's water level has not yet reached the high water level range, then the pumping station's operation is temporarily suspended. If the local pumping station's water level is also in the high water level range, then the pumps are turned on directly, and an alarm is issued simultaneously.

[0057] With the above setup, important parameters such as reading water level data through water level sensors and setting time periods for peak shaving and valley filling are all read or set by terminal controller 1 installed in the pumping station. In addition, there is a coordination controller 2, which is responsible for issuing drainage permission signals to each pumping station to coordinate the operation of each pumping station. All levels of coordination controller 2 are connected to each terminal controller 1. Through the above allocation of control logic tasks, the functional division of each controller is clearer and the data transmission is simpler.

[0058] In the description of this invention, the reference to terms such as "one embodiment," "some embodiments," "one implementation," etc., means that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this invention, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0059] The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings; however, the present invention is not limited thereto. Within the scope of the inventive concept, various simple modifications can be made to the technical solutions of the present invention, including combinations of various specific technical features in any suitable manner. To avoid unnecessary repetition, the present invention will not describe the various possible combinations separately. However, these simple modifications and combinations should also be considered as the content disclosed in the present invention and are all within the protection scope of the present invention.

Claims

1. A multi-stage drainage coordinated control method based on inflow prediction, characterized in that, Includes the following steps: 1) Obtain the current time and determine the peak / valley segment where the current time is located based on the set parameters; 2) Obtain the current water level in the reservoir; 3) Based on the current water inflow rate per unit time in the reservoir, predict the water inflow during this peak-valley period; 4) Calculate the number of water pumps that need to be turned on based on the peak and valley periods; 5) Calculate the number of pumps that need to be turned on in advance, corresponding to the drainage volume already started by the lower-level pumping station; 6) Determine whether drainage is permitted by combining the water levels of the upstream pumping station and the pumping station at this level; The water level in the reservoir includes three levels: ultra-high water level H. HH High water level H H and low water level H L , When the water level is at the extremely high water level H HH At that time, the total water volume held by the reservoir is Q. HH ; When the water level is at a high level H H At that time, the total water volume held by the reservoir is Q. H ; When the water level is at a low level H L At that time, the total water volume held by the reservoir is Q. L ; In step 4), when the water level is in a peak period, the peak period includes: when the next period is a valley period, it is suitable to control the water level in the water tank at a high water level H. H When the next period is a peak period, it is appropriate to control the water level in the water tank at a low water level H. L ; When the next time period is a peak period, the predicted inflow rate for the t4-hour period from the start of the current time period to the end of the flat period is Q4 = Q. t ×t4, Q t The flow rate per unit time corresponds to the flow volume Q. t =Equivalent area of ​​the current water tank × inflow rate per unit time, the total water volume that the current water tank can actually hold is Q. now The water volume exceeding the low water level during detection is Q0. The total water volume that needs to be discharged before the peak water level arrives is calculated to be Q. all = Q4 + Q0, the displacement of each pump is q(m 3 / h), then the number of pumps that need to be turned on is qt4 represents the drainage volume of each pump during the remaining time t4.

2. The multi-stage drainage coordinated control method based on inflow prediction according to claim 1, characterized in that, In step 4), when the electricity consumption period is low, it is appropriate to control the water level in the water tank at a low water level H. L .

3. The multi-stage drainage coordinated control method based on inflow prediction according to claim 2, characterized in that, When the electricity consumption period is at its lowest, the total time from the current time to the end of the lowest period is t1 hours. The water inflow during t1 hours is Q1 = Q t ×t1, obtain the water volume exceeding the low water level at the current time as Q0, and calculate the total water volume that needs to be discharged before the peak arrives at the end of the valley segment as Q. all =Q1+Q0, the displacement of each pump is q(m 3 / h), then the number of pumps that need to be turned on is qt1 represents the drainage volume of each pump during the remaining time t1.

4. The multi-stage drainage coordinated control method based on inflow prediction according to claim 1, characterized in that, In step 4), when the electricity consumption period is peak, it is appropriate to control the water level in the water tank at the ultra-high water level H. HH .

5. The multi-stage drainage coordinated control method based on inflow prediction according to claim 1, characterized in that, When the electricity consumption period is in full swing, the total time from the current time to the end of the peak period is t2 hours. The water inflow during t2 hours is Q2 = Q t ×t2, obtain the water volume Q in the water tank at the time of detection. now The maximum amount of water that can be contained before the end of the peak period is calculated to be , when At that time, the water pump should not be turned on; when If the water pumps are not turned on, the water level in the reservoir will exceed the high water level line. At this time, the displacement of each water pump in this stage is q(m³). 3 / h), then the number of pumps that need to be turned on is qt2 represents the drainage volume of each pump during the remaining time t2.

6. The multi-stage drainage coordinated control method based on inflow prediction according to claim 5, characterized in that, When the next time period is a valley period, the predicted inflow rate for the t3-hour period from the start of the current time period to the end of the flat period is Q3 = Q. t ×t3, the amount of water in the reservoir during the current time period is Q. NOW The maximum amount of water that can be accommodated before the end of the leveling section is calculated to be , like If so, the water pump will not be turned on; like If the water pump is not turned on, the water level in the reservoir will exceed the high water level line H. H At this point, the water tank needs to be drained, and the discharge capacity of each water pump is q(m³). 3 / h), then the number of pumps that need to be turned on is qt3 represents the drainage volume of each pump during the remaining time t3.

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